JP2000296720A - Hydraulic control device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To accelerate a drive shaft without blowing up an internal combustion engine or an electric motor and to improve energy efficiency of the entire apparatus. In a power transmission device that obtains hydraulic pressure required for a transmission or the like by an engine-driven mechanical oil pump and an electric oil pump, hydraulic pressure is secured by an electric pump while the operation of the engine is stopped. The operation of the electric oil pump is also stopped to improve the performance. When the operation of the electric oil pump is restarted, the shift position SP
The possibility of sudden start or rapid acceleration of the vehicle by the driver is determined based on the vehicle speed, the vehicle speed V, and the brake switch BS (S102 to S1).
06) When this possibility exists, the normal rotation speed Nse
A target rotation speed Nm * larger than t is set (S11).
0), drive control of the oil pump motor (S11)
2). As a result, the hydraulic pressure quickly rises, and it is possible to prevent the engine and the motor from blowing up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control apparatus, and more particularly, to an electric hydraulic pressure generating means capable of generating a hydraulic pressure required to operate an engaging means for transmitting power from an internal combustion engine to a drive shaft. And controlling the electric hydraulic pressure generating means so as to stop the generation of the required hydraulic pressure when the predetermined condition is satisfied or to reduce the hydraulic pressure, and to reduce the required hydraulic pressure when the condition for generating the hydraulic pressure is satisfied. The present invention relates to a hydraulic control device that controls an electric hydraulic pressure generating means to generate a hydraulic pressure.

[0002]

2. Description of the Related Art Conventionally, as this type of hydraulic control device,
A hydraulic control device for a hybrid vehicle including an internal combustion engine and an electric motor, wherein the internal combustion engine is operated as a pump that provides hydraulic pressure for driving a hydraulically driven clutch that changes a transmission gear position and interrupts power. And a second oil pump driven by receiving electric power from a secondary battery (for example, Japanese Patent Laid-Open No. 6-383).
03 publication). In this hydraulic control device, when it is not necessary to change the gear position of the transmission, the operation of the electric oil pump is stopped in order to increase the energy efficiency of the entire vehicle. In this hydraulic control device, when the internal combustion engine is operating, hydraulic pressure is ensured by the first oil pump, and when the internal combustion engine is not operating, hydraulic pressure is ensured by the second oil pump.

[0003]

However, such a hydraulic control device has a problem that the engine may temporarily blow up when the drive shaft is rapidly accelerated. If the drive shaft is suddenly accelerated when the operation of the electric oil pump is stopped, sufficient hydraulic pressure is not supplied, and the clutches and brakes of the transmission are engaged. Is caused by insufficient. In response to such problems, it is conceivable to prohibit stopping the operation of the electric oil pump and always operate the electric oil pump while the power transmission device is operating.However, the deterioration of the electric oil pump is accelerated and the energy efficiency of the entire device is reduced. Lower it.

An object of the hydraulic control device of the present invention is to accelerate a drive shaft without blowing up an internal combustion engine. Another object of the hydraulic control device of the present invention is to improve the energy efficiency of the entire vehicle. Furthermore,
An object of the hydraulic control device of the present invention is to prevent deterioration of equipment.

[0005]

Means for Solving the Problems and Their Functions and Effects The hydraulic control device of the present invention employs the following means in order to achieve at least a part of the above object.

A first hydraulic control device of the present invention has an electric hydraulic pressure generating means capable of generating a hydraulic pressure required to operate an engaging means for transmitting power from an internal combustion engine to a drive shaft,
The electric hydraulic pressure generating means is controlled so that the generation of the required hydraulic pressure is stopped or the hydraulic pressure is reduced when a predetermined condition is satisfied, and the required hydraulic pressure is generated when the condition for generating the hydraulic pressure is satisfied. A hydraulic control device for controlling the electric hydraulic pressure generating means so as to control the electric hydraulic pressure generating means to generate a hydraulic pressure larger than the required hydraulic pressure when a condition for generating the hydraulic pressure is satisfied. The gist is to provide time control means.

In the first hydraulic control device of the present invention, when the electric hydraulic pressure generating means is started, the electric hydraulic pressure generating means is controlled so that a hydraulic pressure larger than that required to operate the engaging means is generated. Thus, the hydraulic pressure can be generated quickly. As a result, it is possible to prevent such a problem that the internal combustion engine or the electric motor is blown up due to insufficient hydraulic pressure. Further, energy efficiency can be improved as compared with a hydraulic control device of a type in which a required hydraulic pressure is always generated by an electric hydraulic pressure generating means. The "engaging means" includes not only those constituted by a torque converter and a stepped transmission, but also those constituted by a continuously variable transmission.

In the first hydraulic control apparatus of the present invention, the electric hydraulic pressure generating means includes a drive motor having a variable number of revolutions as a hydraulic pressure source, and the starting control means controls the number of revolutions of the drive motor. The driving motor may be a means for controlling the driving of the drive motor so that the rotation speed becomes higher than the rotation speed at the time of generating the required oil pressure. The first hydraulic control device according to the aspect of the present invention further includes a state determination unit that determines a state of the drive shaft, wherein the start-time control unit determines a state of the drive shaft based on the state of the drive shaft determined by the state determination unit. Target rotation speed setting means for setting a target rotation speed of the drive motor at the start of driving of the electric hydraulic pressure generation means; and drive control of the drive motor such that the drive motor is driven at the set target rotation speed. And a drive motor control unit that performs the control. With this configuration, the hydraulic pressure can be generated by the electric hydraulic pressure generating means based on the state of the drive shaft at the start of driving of the electric hydraulic pressure generating means.

In the first hydraulic control apparatus according to the present invention, in which the target rotation speed is set based on the state of the drive shaft,
The state determination unit is a unit that determines whether an occurrence of a request for rapid acceleration of the drive shaft by an operator is predicted, and the target rotation speed setting unit is configured to determine whether the drive shaft When it is not determined that the state is the state in which the occurrence of the request for the rapid acceleration is predicted, the target rotation number of the drive motor is set to the first rotation number, and the state of the drive shaft is changed by the state determination unit. When it is determined that the occurrence of the request for rapid acceleration is predicted, the target rotation speed of the drive motor is set to a second rotation speed higher than the first rotation speed. Can also. With this configuration, when the drive shaft is rapidly accelerated, the target rotation speed of the drive motor is set to the large second rotation speed, so that it is possible to quickly generate hydraulic pressure and make the engagement means function effectively, and Inconvenience caused by shortage can be prevented.

[0010] In the first hydraulic control apparatus according to the aspect of the present invention, the state determining means includes a state determining means for determining a state in which a request for rapid acceleration of the drive shaft is expected to occur.
At least when the power can be transmitted to the drive shaft via the engaging means, the means for determining that the request for the rapid acceleration is predicted to be generated may be provided.

Further, in the first hydraulic control apparatus according to the present invention having a state determining means for determining a state in which a request for rapid acceleration of the drive shaft is expected to occur, the drive shaft may be stopped in a state where the rotation is stopped. A drive shaft fixing means that can be fixed, wherein the state determination means is means for determining that the occurrence of the sudden acceleration request is predicted when the drive shaft is not fixed by the drive shaft fixing means. It can be.

Further, in the first hydraulic control apparatus according to the present invention, further comprising state determination means for determining a state in which a request for rapid acceleration of the drive shaft is expected to occur, a braking force can be applied to the drive shaft. A drive shaft braking unit, wherein the state determination unit determines whether or not the occurrence of the request for rapid acceleration is predicted based on a braking force applied to the drive shaft by the drive shaft braking unit. It may be a means for determining. In this case, the hydraulic pressure can be controlled based on the braking force acting on the drive shaft. In the first hydraulic control device according to the aspect of the present invention, the state determination unit may request the rapid acceleration when the braking force applied to the drive shaft by the drive shaft braking unit becomes equal to or less than a predetermined force. Or when the rate of change in the negative direction of the braking force applied to the drive shaft by the drive shaft braking means is greater than or equal to a predetermined value. It may be a means for determining that the occurrence of a request for rapid acceleration is predicted.

[0013] In a first hydraulic pressure control apparatus according to the present invention, in which a target rotation speed is set based on a state of a drive shaft, a temperature detecting means for detecting a temperature of oil used for the hydraulic pressure is provided.
The target rotation speed setting means may be means for setting the target rotation speed based on the temperature of the oil detected by the temperature detection means. This makes it possible to cope with the physical properties based on the oil temperature, and to generate the hydraulic pressure more quickly. In the first hydraulic control device of this aspect of the present invention, the target rotation speed setting means may be a means for setting a higher rotation speed as the oil temperature is lower as the target rotation speed. Usually, the viscosity of the oil increases as the temperature decreases.

[0014] In the first hydraulic control device of the present invention, the electric hydraulic pressure generating means includes a line pressure changing means for changing a line pressure of a hydraulic line reaching the engaging means, and the start-up control means comprises It may be a means for controlling the line pressure changing means so that the line pressure of the line increases. In this case, the hydraulic pressure can be increased quickly.

The second hydraulic control device of the present invention has an electric hydraulic pressure generating means capable of generating a hydraulic pressure necessary for operating an engaging means for transmitting power from an internal combustion engine to a drive shaft,
The electric hydraulic pressure generating means is controlled so that the generation of the required hydraulic pressure is stopped or the hydraulic pressure is reduced when a predetermined condition is satisfied, and the required hydraulic pressure is generated when the condition for generating the hydraulic pressure is satisfied. A hydraulic control device for controlling the electric hydraulic pressure generating means so as to stop the required hydraulic pressure or reduce the hydraulic pressure for a predetermined time when the predetermined condition is satisfied and the required hydraulic pressure is stopped or reduced. When the condition for the occurrence of the hydraulic pressure is not satisfied, the hydraulic control device includes a hydraulic regeneration control unit that controls the electric hydraulic pressure generation unit to generate the required hydraulic pressure even though the condition for generating the hydraulic pressure is not satisfied. I do.

According to the second hydraulic control device of the present invention, when the condition for generating the hydraulic pressure is not satisfied for a predetermined time, the required hydraulic pressure is generated regardless of the condition for generating the hydraulic pressure not being satisfied. In addition, it is possible to prevent the oil pressure from dropping due to a remarkable drop in the oil pressure, and to quickly obtain the required oil pressure when the condition for generating the oil pressure is satisfied.

In the second hydraulic control apparatus according to the present invention, the hydraulic pressure regeneration control means may generate the required hydraulic pressure until the required hydraulic pressure is generated, even though the predetermined condition is satisfied. It may be a means for controlling the electric hydraulic pressure generating means so as to generate the electric pressure. In this way, the required hydraulic pressure can be reliably generated.

Further, in the second hydraulic control device of the present invention, there is provided a temperature detecting means for detecting a temperature of the oil used for the hydraulic pressure, and the hydraulic pressure regenerating means is provided with a temperature of the oil detected by the temperature detecting means. A predetermined time setting means for setting the predetermined time based on the predetermined time. By doing so, the predetermined time can be set according to the physical properties based on the oil temperature, and a more appropriate predetermined time can be set. In the second hydraulic control device of this aspect of the present invention, the predetermined time setting means may be means for setting the predetermined time short when the oil temperature is outside a predetermined temperature range. This is because oil tends to be too viscous when the temperature is low, and tends to be too low when the temperature is high.

A third hydraulic control device of the present invention has an electric hydraulic pressure generating means capable of generating a hydraulic pressure necessary for operating an engaging means for transmitting power from an internal combustion engine to a drive shaft,
The electric hydraulic pressure generating means is controlled so that the generation of the required hydraulic pressure is stopped or the hydraulic pressure is reduced when a predetermined condition is satisfied, and the required hydraulic pressure is generated when the condition for generating the hydraulic pressure is satisfied. A hydraulic pressure control device that controls the electric hydraulic pressure generation means so as to detect a temperature of oil used for the hydraulic pressure, and stop or generate the required hydraulic pressure based on the detected temperature. The gist of the present invention is to include state setting means for setting a state of a decrease in hydraulic pressure, and state control means for controlling the electric hydraulic pressure generation means to be in the set state.

According to the third hydraulic control device of the present invention, it is possible to stop the generation of the required hydraulic pressure or to reduce the hydraulic pressure based on the temperature of the oil. As a result, when hydraulic pressure is required, the required hydraulic pressure can be obtained quickly.

In the third hydraulic control apparatus of the present invention, the state setting means is means for setting a state in which the required oil pressure is generated when the temperature of the oil is outside a predetermined temperature range. Can also. Oil has a tendency to be too viscous when the temperature is low, and has a tendency to be too low when the temperature is high. In such a case, stopping the generation of the hydraulic pressure or reducing the hydraulic pressure may not be preferable. As a result, the required oil pressure can be quickly obtained.

The fourth hydraulic control device of the present invention has an electric hydraulic pressure generating means capable of generating a hydraulic pressure necessary for operating an engaging means for transmitting power from an internal combustion engine to a drive shaft,
The electric hydraulic pressure generating means is controlled so that the generation of the required hydraulic pressure is stopped or the hydraulic pressure is reduced when a predetermined condition is satisfied, and the required hydraulic pressure is generated when the condition for generating the hydraulic pressure is satisfied. A hydraulic pressure control device mounted on a vehicle for controlling the electric hydraulic pressure generating means, the gradient detecting means detecting a gradient of a current position of the vehicle, and the required hydraulic pressure based on the detected gradient. The present invention is characterized in that it comprises a state setting means for setting the state of the occurrence of the stoppage of the oil pressure or a state of a decrease in the hydraulic pressure, and a state control means for controlling the electric hydraulic pressure generating means to attain the set state.

According to the fourth hydraulic control device of the present invention, it is possible to stop the generation of the required hydraulic pressure or reduce the hydraulic pressure based on the gradient of the current position of the vehicle. As a result, when hydraulic pressure is required, the required hydraulic pressure can be obtained quickly.

In the fourth hydraulic control apparatus according to the present invention, the state setting means may be a means for setting a state in which the required hydraulic pressure is generated when the gradient is equal to or higher than a predetermined gradient. When the vehicle stops on a slope or other location with a certain gradient and stops the generation of hydraulic pressure by the electric hydraulic pressure generation means, the vehicle may move in an unexpected direction with a slight release of the brake by the driver. This movement is often undesirable because it is unexpected. According to the fourth hydraulic control device of the present invention, such unexpected movement of the vehicle can be prevented.

[0025]

Next, embodiments of the present invention will be described based on examples. FIG. 1 is a configuration diagram schematically showing a schematic configuration when a power transmission device 20 including a hydraulic control device according to an embodiment of the present invention is mounted on a vehicle. As shown in the drawing, the power transmission device 20 of the embodiment controls a torque converter 50 that amplifies torque by the action of fluid, a transmission 60 that reduces or increases the number of revolutions at a predetermined speed ratio, and the entire device. A hybrid electronic control unit (hereinafter referred to as HVECU) 80.

The engine 30 is an internal combustion engine that outputs power using gasoline as fuel, and its operation is controlled by an engine electronic control unit (hereinafter, referred to as EG ECU) 38. Engine 30 by EGECU 38
Is controlled by controlling the opening of a throttle valve (not shown) and controlling the opening time of a fuel injection valve (not shown), but details thereof are omitted.

The motor 40 is configured as a synchronous motor generator, and has a rotor 4 having a plurality of permanent magnets 43 on the outer peripheral surface.
2 and a stator 44 around which a three-phase coil 45 forming a rotating magnetic field is wound. The operation of the motor 40 is controlled by a motor electronic control unit (hereinafter referred to as MGECU) 46 including an inverter circuit (not shown). The operation control of the motor 40 by the MGECU 46 is performed by sequentially controlling the ratio of the ON time of each transistor of the inverter circuit connected to the battery 48 by controlling the three-phase coil 4.
5 is performed by controlling the current flowing through each coil. In the embodiment, since the motor 40 is a synchronous motor generator, the battery 48 can be charged by operating the motor 40 as a generator during braking or driving by the engine 30. This motor 4
Control for operating 0 as a generator is also performed by the MGECU 46.

In the present hybrid vehicle, as shown in an explanatory diagram exemplifying the driving force source traveling region in FIG. 2, when the charged state of the battery 48 is good and the required load on the vehicle is small, the engine 30 is operated. Is stopped, the vehicle is driven by the power of the motor 40 (the area indicated by "motor" in FIG. 2). At this time, the engine 30 is driven by the motor 40 without fuel supply and ignition. When the state of charge of battery 48 is good and the required load on the vehicle is large, engine 30 is driven and the vehicle is driven by the power of engine 30 (the area indicated by "engine" in FIG. 2). When the state of charge of the battery 48 is good and the vehicle decelerates, the motor 40 is operated as a generator to perform regenerative braking for charging the battery 48 with the generated power. When the vehicle is stopped, if the state of charge of the battery 48 is good, the operation of the engine 30 is stopped (fuel supply and ignition stop), but the state of charge continues while power consumption from the battery 48 continues. When it decreases, the engine 30 is driven by the motor 40, fuel supply and ignition are started, and the operation of the engine is restarted. If the state of charge of the battery 48 decreases even when the vehicle is driven by the motor 40 at a low speed, fuel supply and ignition are similarly restarted, and the operation of the engine 30 is restarted.

The torque converter 50 is a well-known fluid type torque converter that amplifies torque by the action of circulating oil and transmits the amplified torque to the rear.
, A turbine liner 54 connected to the transmission 60, and a stator 58 connected to a fixed portion via a one-way clutch 56. The shaft of the pump impeller 52 extends, and a mechanical oil pump 70 is mounted here. A detailed description of the mechanical oil pump 70 will be described later.

The input shaft of the transmission 60 is connected to the output shaft of the torque converter 50, and the speed is reduced or increased at a predetermined speed ratio. Further, an output shaft of the transmission 60 is connected to a drive shaft 66, and the drive shaft 66 is connected to drive wheels 68 and 69 via a differential gear 67. The transmission 60 of the present embodiment is configured as having five forward speeds and one reverse speed. Specifically, the transmission 60
The vehicle includes a planetary gear mechanism 62 including a plurality of planetary gears, a clutch and a brake, and clutches C1 and C2 for switching between forward and backward movement of the vehicle and for intermittent power. Here, when the vehicle is moved forward, the clutch C1 is engaged and the clutch C2 is disengaged. Conversely, when the vehicle is moved backward, the clutch C1 is disengaged and the clutch C2 is engaged. In neutral or parking, power transmission is cut off by disengaging both clutches C1 and C2. The detailed description of the planetary gear mechanism 62 will be redundant in the description of the present invention, and a description thereof will be omitted. Clutches, brakes, clutches C (not shown) of the planetary gear mechanism 62
Reference numerals 1 and C2 operate using hydraulic pressure as a power source, and the operation of the hydraulic pressure is performed by opening and closing a solenoid valve (not shown). Such opening and closing control of the solenoid valve is performed by an automatic transmission electronic control unit (hereinafter referred to as ATECU) 64. The hydraulic pressure is ensured by driving the aforementioned mechanical oil pump 70 or by driving an electric oil pump 72 driven by electric power supplied from the battery 48.

Although not shown, the mechanical oil pump 70 is configured as a gear oil pump including a driven gear and a drive gear. The mechanical oil pump 70 is attached to the shaft of the pump impeller 52 as described above, and is driven by rotation of the crankshaft 32 regardless of whether the drive shaft 66 rotates. Therefore, when the drive shaft 66 is not rotating, that is, when the vehicle is stopped, the mechanical oil pump 7
A value of 0 indicates that the engine 30 is being driven when the engine 30 is operating, and is stopped when the operation of the engine 30 is stopped. Of course, the mechanical oil pump 70 is also driven by forcibly rotating the crankshaft 32 by the motor 40, but this drive is not preferable from the viewpoint of energy efficiency.

The electric oil pump 72 is provided with an oil pump motor 73 for controlling the number of revolutions as a driving means. The discharge amount of the electric oil pump 72 can be changed by changing the number of revolutions of the oil pump motor 73. ing. The oil pump motor 73 has its rotation speed Nm.
Is installed.

An electronic control unit for a hybrid (hereinafter, referred to as an electronic control unit)
The HVECU 80 is a unit that controls the entire power transmission device 20. HVECU 80 is C
A one-chip microprocessor mainly composed of a PU 82, a ROM 84 storing a processing program and a RAM 8 temporarily storing data
6, an input / output port (not shown), and a serial communication port (not shown) for communicating with the EG ECU 38, the MGECU 46, and the ATECU 64. This HVECU
Reference numeral 80 denotes a rotation speed Ne of the engine 30 detected by an engine rotation speed sensor 34 attached to the crankshaft 32 (more precisely, a rotation speed of the crankshaft 32).
, An oil temperature T detected by an oil temperature sensor 76 attached to an oil pan attached to the transmission 60, a rotation speed Nm of an oil pump motor 73 detected by a motor rotation speed sensor 74, and a starter from a starter switch 87. The switch ST, the gradient RG at the current position of the vehicle detected by the gradient sensor 89, the accelerator pedal position AP detected by the accelerator pedal position sensor 91 as the depression amount of the accelerator pedal 90, and the brake detected by the brake pedal position sensor 93. The brake pedal position BP as the depression amount of the pedal 92, the brake oil pressure PB by the action of the brake master cylinder 94 detected by the brake oil pressure sensor 95, and the shift lever 9 detected by the shift position sensor 97 , A brake switch BP for turning on / off the side brake lever 98 detected by the brake switch 99, wheel speeds V1 and V2 from wheel speed sensors 68a and 69a attached to the driving wheels 68 and 69, and the like. Is input via the input port. The HVECU 80 outputs a drive signal CP to the oil pump motor 73 and a lighting signal CI to the indicator 88.

The power transmission device 20 thus configured is
An engine drive mode in which the drive shaft 66 is driven only by the power output from the engine 30 determined based on the power required for the drive shaft 66, the state of the drive shaft 66, the state of the battery 48, and the like by a drive control routine (not shown). A motor drive mode in which the drive shaft 66 is driven only by the power output from the motor 40, a hybrid drive mode in which the drive shaft 66 is driven by power output from the engine 30 and the motor 40, and drive using the power output from the engine 30 Driving the shaft 66 and regenerating part of the power output from the engine 30 by the motor 40
The drive shaft 66 is driven in various modes such as a charge drive mode for charging the drive shaft 8. Engine 3
In the drive mode in which 0 is operated, the mechanical oil pump 70 is driven in association with the operation of the engine 30, so that the operation of the electric oil pump 72 is stopped. Engine 3
Even in the drive mode in which 0 is not operated, when the gear position of the transmission 60 is not changed, the operation of the electric oil pump 72 is stopped because no oil pressure is required.

Next, a description will be given of the power transmission device 20 when the driving of the electric oil pump 72 whose operation is stopped is started. FIG. 3 shows the HVEC of the power transmission device 20 according to the embodiment.
It is a flowchart which shows an example of the processing routine at the time of the electric oil pump drive start performed by CPU82 with which U80 is provided. This routine is executed when a drive start signal of the electric oil pump 72 stopped by a drive control routine (not shown) is detected.

When the electric oil pump drive start processing routine is executed, the CPU 82 firstly executes the shift position SP detected by the shift position sensor 97.
And the brake switch BS detected by the brake switch 99, the oil temperature T detected by the oil temperature sensor 76, and the vehicle speed V are read (step S1).
00). Here, the vehicle speed V used in the embodiment is calculated from the wheel speeds V1, V2 of the drive wheels 68, 69 detected by the wheel speed sensors 68a, 69a. Specifically, the vehicle speed V is read from the vehicle speed V calculated from the wheel speeds V1 and V2 by a vehicle speed calculation processing routine (not shown) and stored at a predetermined address in the RAM 86 from the predetermined address. The vehicle speed V may be read from a value obtained from the rotation speed of the drive shaft 66 or a value obtained using a ground speed sensor.

Subsequently, the read shift position SP
Is in the neutral N range or the P range for parking (step S102). When the vehicle is in the N range or the P range, it is determined that there is no possibility that the driver will suddenly start the vehicle, and the normal rotation speed Nset is set as the target rotation speed Nm * at the start of driving of the oil pump motor 73 (step S108) The drive control of the oil pump motor 73 is performed so that the rotation speed Nm of the oil pump motor 73 becomes the set target rotation speed Nm * (step S11).
2) This routine ends.

On the other hand, when the shift position SP is not in the N range or the P range, it is determined whether or not the vehicle speed V is 0 (step S104). When the vehicle speed V is not the value 0, it is determined that there is a possibility that the driver may suddenly accelerate the vehicle because the vehicle is running, and the target rotation at the start of driving of the oil pump motor 73 based on the read oil temperature T is determined. The number Nm * is set (step S110), the drive of the oil pump motor 73 is controlled so that the number of revolutions Nm of the oil pump motor 73 becomes the set target number of revolutions Nm * (step S112), and this routine ends. . Here, in the embodiment, a value obtained by adding a correction term f (T) based on the oil temperature T to the normal rotation speed Nset is set as the target rotation speed Nm *.
The correction term f (T) is set based on the relationship between the oil temperature T and the viscosity of the oil. In the embodiment, the relationship is stored in advance in the ROM 84 as a map illustrated in FIG. Given a temperature T, a corresponding correction term f
(T) was derived. As described above, since the rotation speed higher than the normal rotation speed Nset is set to the target rotation speed Nm *, the hydraulic pressure can be increased more quickly than when the normal rotation speed Nset is set to the target rotation speed Nm *. .

When the vehicle speed V is 0, the brake switch BS detected by the brake switch 99 is checked (step S106). When the brake switch BS is on, the driver is in a state where the side brake lever 98 is pulled. It is determined that there is no possibility of sudden start of the vehicle due to the normal rotation speed Nset as the target rotation speed Nm * at the start of driving of the oil pump motor 73 (step S108), and the rotation speed of the oil pump motor 73 is set. The drive control of the oil pump motor 73 is performed so that Nm becomes the set target rotation speed Nm * (step S112), and this routine ends. When the brake switch BS is off, it is determined that the driver may suddenly start even when the vehicle is stopped, and the oil pump motor 7 is determined based on the oil temperature T.
3 is set (Step S110), and the drive of the oil pump motor 73 is controlled so that the rotation speed Nm of the oil pump motor 73 becomes the set target rotation speed Nm * (Step S110). (S112), this routine ends.

Next, a description will be given of a change in hydraulic pressure caused by performing such control at the start of driving of the electric oil pump 72. FIG. 5 is a time chart schematically illustrating the relationship between the rotation speed Nm and the oil pressure at the start of driving of the oil pump motor 73 in a time series. As shown in the figure, a drive start signal of the electric oil pump 72 is detected at time t1, and the target rotation speed Nm * is set based on the oil temperature T by the electric oil pump drive start processing routine illustrated in FIG. The drive of the oil pump motor 73 is controlled. Now, assuming that the oil temperature T is the oil temperature T1, T2, and T3 in descending order, the correction term f (T) for this oil temperature T is f (T1), f (T2), and f (T3 ), The target rotation speed Nm * is set to the normal rotation speed Nset by adding a correction term to the rotation speeds N1, N2, and N3. And
The oil pump motor 7 is controlled to reach the target rotation speed Nm *.
3 is controlled to drive the oil pump motor 73 at time t3.
Becomes the target rotation speed Nm *. On the other hand, the hydraulic pressure starts rising slightly after the start of driving of the oil pump motor 73 and reaches the target pressure Pt at time t3 when the correction term is controlled as the target rotation speed Nm * in addition to the normal rotation speed Nset. When the rotation speed Nset is controlled as the target rotation speed Nm *, the target pressure Pt is reached at a time t4 slightly delayed from the time t3. Therefore, by controlling the drive of the oil pump motor 73 using the target rotation speed Nm * obtained by adding the correction term to the normal rotation speed Nset, the oil pressure can be quickly brought to the target pressure Pt.

According to the power transmission device 20 of the embodiment described above, it is determined whether or not there is a possibility that the driver will suddenly start or suddenly accelerate the vehicle when driving the electric oil pump 72. If there is a possibility, the hydraulic pressure can be quickly raised by setting the target rotation speed Nm * of the oil pump motor 73 to a large value and performing drive control. As a result, it is possible to prevent such a problem that the engine 30 and the motor 40 are blown up. In addition, since the target rotation speed Nm * is set based on the oil temperature T, it is possible to eliminate variations in the rise of the oil pressure due to the viscosity of the oil, and to prevent the oil pump motor 73 from rotating unnecessarily at a high speed. Degradation can be prevented. Of course, the electric oil pump 72 is stopped when there is no need to change the gear position of the transmission 60, so that the deterioration of the electric oil pump 72 is not accelerated,
The energy efficiency of the entire power transmission device 20 can be improved.

In the power transmission device 20 of the embodiment, the possibility that the driver suddenly starts or accelerates the vehicle is determined based on the shift position SP, the vehicle speed V, and the brake switch BS. Alternatively, the determination may be made only by the brake switch BS. Further, the possibility that the driver suddenly starts or accelerates the vehicle may be determined based on the state of the brake that applies the braking force to the drive shaft 66. In this case, the electric oil pump drive start processing routine of FIG. 6 may be executed instead of the electric oil pump drive start processing routine of FIG. Hereinafter, a process of determining the possibility of sudden start or sudden acceleration of the vehicle by the driver based on the state of the brake that applies the braking force to the drive shaft 66 using the routine of FIG. 6 will be briefly described.

When the electric oil pump drive start processing routine is executed, the CPU 82 first determines the brake oil pressure PB detected by the brake oil pressure sensor 95, the oil temperature T detected by the oil temperature sensor 76, and the vehicle speed V. Reading (step S120), the read vehicle speed V is 0
Is performed (step S1).
22). When the vehicle speed V is not the value 0, it is determined that there is a possibility that the driver may suddenly accelerate the vehicle because the vehicle is running, and the target rotation at the start of driving of the oil pump motor 73 based on the read oil temperature T is determined. The number Nm * is set (step S130), the drive of the oil pump motor 73 is controlled so that the number of revolutions Nm of the oil pump motor 73 becomes the set target number of revolutions Nm * (step S132), and this routine ends. .

When the vehicle speed V is equal to 0, step S12
The brake hydraulic pressure PB read at 0 is compared with the threshold value Pref (step S124). Here, the threshold value Pref is
This is set as a brake oil pressure that generates a braking force that can continue the stopped state on a road having a slight gradient. When the brake oil pressure PB is equal to or greater than the threshold value Pref, it is determined that there is no possibility that the driver will suddenly start the vehicle, and the normal rotation speed Nset is set as the target rotation speed Nm * at the start of driving the oil pump motor 73. (Step S1
28) The oil pump motor 7 is controlled so that the rotation speed Nm of the oil pump motor 73 becomes the set target rotation speed Nm *.
3 is driven (step S132), and this routine ends. On the other hand, when the brake oil pressure PB is less than the threshold value Pref, it is determined that there is a possibility of sudden start by the driver, and a target rotation speed Nm * at the time of starting the driving of the oil pump motor 73 is set based on the oil temperature T. (Step S13
0), the oil pump motor 73 is set so that the rotation speed Nm of the oil pump motor 73 becomes the set target rotation speed Nm *.
Is driven (step S132), and this routine ends.

If the above-described electric oil pump drive start processing routine of FIG. 6 is executed, it is possible to determine the possibility of rapid acceleration of the vehicle by the driver based on the brake oil pressure PB. Can be used to quickly raise hydraulic pressure. As a result, it is possible to prevent such a problem that the engine 30 and the motor 40 are blown up. Naturally, since the target rotation speed Nm * is set based on the oil temperature T, it is possible to eliminate the variation in the rise of the hydraulic pressure due to the viscosity of the oil and to prevent the oil pump motor 73 from deteriorating.

In the power transmission device 20 of the modified example that executes the routine of FIG. 6, the brake hydraulic pressure PB is set to the threshold value Pr.
The possibility of sudden acceleration of the vehicle by the driver is determined by comparing with ef. However, the possibility of sudden acceleration of the vehicle by the driver is determined when the rate of change of the brake oil pressure PB in the negative direction is equal to or greater than a predetermined value. It may be a thing. The rate of change of the brake oil pressure PB in the negative direction corresponds to a change in releasing the depressed brake pedal 92. When the value is large, the depressed brake pedal 92 is suddenly released. This is because, as the subsequent operation, the operation of depressing the accelerator pedal 90 is predicted.

In the power transmission device 20 of the embodiment and the modified example,
At the time of restart when the possibility of sudden start of the vehicle by the driver is determined, the rotation speed of the electric oil pump 72 is set to a target rotation speed Nm * higher than the normal rotation speed Nset. Normal restart speed Ns at the time of restart without determining the possibility of sudden start or sudden acceleration of the vehicle due to
The rotation speed higher than et may be set as the target rotation speed Nm *.

In the power transmission device 20 of the embodiment, the target rotation speed N of the oil pump motor 73 is determined based on the oil temperature T.
Although m * is set, the target rotation speed Nm * may be set to a rotation speed higher than the normal rotation speed Nset regardless of the oil temperature T.

Further, in the power transmission device 20 according to the embodiment, the oil pressure is quickly raised by increasing the rotation speed of the oil pump motor 73. However, instead of changing the rotation speed, or changing the rotation speed, In addition to the change, the hydraulic pressure may be quickly increased by increasing the line pressure. Usually, this type of hydraulic circuit is provided with a line pressure control device for controlling the line pressure, so that when the electric oil pump 72 is started, the line pressure can be controlled to be higher than the normal pressure. . Thus, the hydraulic pressure can be quickly raised.

Next, a power transmission device 20B having a hydraulic control device according to a second embodiment of the present invention will be described.
The hardware configuration of the power transmission device 20B of the second embodiment is the same as the hardware configuration of the power transmission device 20 of the first embodiment. Accordingly, the same reference numerals as those of the power transmission device 20 of the first embodiment denote the same hardware components of the power transmission device 20B of the second embodiment, and a description thereof will be omitted.

In the power transmission device 20B of the second embodiment, the operation of the electric oil pump 72 is controlled by the electric oil pump control routine illustrated in FIGS.
Hereinafter, control of the electric oil pump 72 will be described using this routine. This electric oil pump control routine is repeatedly executed at predetermined time intervals (for example, every 10 msec) after the power transmission device 20B is started.

When the electric oil pump control routine is executed, the CPU 82 of the HVECU 80 first executes a process of reading a drive signal (step S200). This drive signal is a flag having as a value whether to drive or stop the electric oil pump 72. In the power transmission device 20B of the second embodiment, as described in the first embodiment, the electric oil pump 72 is driven or stopped based on the drive mode, the state of the transmission 60, and the like. At this time, the state required for the electric oil pump 72 is set to RA
Since the data is written to the predetermined address of the M86, the process of reading the drive signal is a process of reading the data of the predetermined address in the RAM 86.

When the read drive signal is in the drive state, the value of the operation state determination flag FM having a value indicating whether or not the electric oil pump 72 is in the current drive state is checked (step S204). Is the value 0
In this case, it is determined that the engine is not in the operating state, and the target rotation speed Nm * of the oil pump motor 73 is set to the normal rotation speed Nse.
A value obtained by adding a predetermined rotation speed ΔN to t is set, and a value higher than the normal line pressure Pset by a predetermined pressure ΔP is set as the target line pressure P * (step S206). Then, the value 1 is set in the operation state determination flag FM, the value 1 is set in the startup determination flag FS for determining that the engine is being started, and the value 0 is set in the counter C1 (step S208). The target line pressure P * which is controlled by the rotation speed Nm * and is set by the line pressure control device.
(Step S218), and this routine ends. As described above, by setting the target rotation speed Nm * at the time of startup and the target line pressure P * high, the hydraulic pressure can be quickly raised.

On the other hand, when the driving state determination flag FM is equal to 1 in step S204, that is, when the driving signal continuously requests the driving state after performing the processing in steps S206 and S208, the counter C1 is set to the threshold value. CR
It is determined whether it is 1 or more (step S210).
Here, the threshold value CR1 is set as a time required from the start of the start of the electric oil pump 72 to the time when a sufficient oil pressure is obtained, such as the characteristics of the electric oil pump 72, the characteristics of the hydraulic circuit, and the start time of this routine. Is set by When the counter C1 is less than the threshold value CR1,
It is determined that sufficient oil pressure has not been obtained yet, and counter C
The control is performed such that the oil pump motor 73 and the line pressure controller operate at the previously set target rotation speed Nm * and target line pressure P * (step S1).
218), this routine ends.

When the counter C1 reaches the threshold value CR1, the normal rotation speed Nset is set as the target rotation speed Nm *, and the normal line pressure Pset is set as the target line pressure P * (step S214). Set a value of 0, which means that it is no longer at startup (step S
216), the oil pump motor 73 and the line pressure control device are controlled to operate at the set target rotation speed Nm * and target line pressure P * (step S218), and this routine ends. Thus, the activation of the electric oil pump 72 ends.

If the drive signal is a signal requesting the stop state in step S202, the operation state determination flag FM
Is checked (step S220), and when the operation state determination flag FM is the value 1, it is determined that the operation stop processing is necessary, and first, the start determination flag FS is checked (step S2).
22). When the activation determination flag FS has a value of 1, the electric oil pump 72 is currently being activated, so that the stop processing is not performed until the activation is completed, irrespective of the request for the stop state of the drive signal. Specifically, the process proceeds to step S210 in FIG. 7, and the activation process is continuously performed.

When the start determination flag FS has a value of 0, it is determined that the electric oil pump 72 is not being started, and the oil temperature T detected by the oil temperature sensor 76 is read (step S224). It is determined whether it is within the range between the threshold Tr1 and the threshold Tr2 (Step S
226). When the oil temperature T is low, the rise of the oil pressure is deteriorated due to its high viscosity, and when the oil temperature T is high, the decrease in the viscosity is caused by an increase in the leakage amount of the pressure regulating system. Therefore, if the oil temperature T is too low or too high, the rise of the oil pressure is deteriorated. In step S226, the temperature range is set to the threshold Tr1 and the threshold Tr.
That is, the determination is made based on 2. Therefore, the threshold Tr
1 and the threshold Tr2 are determined by the characteristics of the oil used and the characteristics of the hydraulic circuit.

When the oil temperature T is within the range between the threshold value Tr1 and the threshold value Tr2, it is determined that the rising property at the time of restart is good, and the gradient RG of the current position of the vehicle detected by the gradient sensor 89 is read. (Step S227),
The absolute value of the read gradient RG is compared with a threshold value RG1 (step S228). Here, the threshold value RG1 is set as a gradient value at which the stop state cannot be maintained unless the brake is operated, or a value slightly larger than this. When the absolute value of the gradient RG of the current position of the vehicle is smaller than the threshold value RG1, it is determined that the stopped state can be stably maintained, and the process of stopping the electric oil pump 72 is executed (step S229). Specifically, the supply of electric power to the oil pump motor 73 may be stopped. Then, the operation state determination flag FM is set to a value of 0 indicating that the vehicle is in a stopped state, the counter C2 is set to a value of 0, and the threshold value CR2 is set to a value determined based on the oil temperature T (step S230). finish. The threshold value CR2 will be described later. In addition, in step S226, the oil temperature T becomes equal to the threshold Tr1 and the threshold Tr.
If the absolute value of the gradient RG of the current position of the vehicle is equal to or larger than the threshold value RG1 in step S228, the vehicle is stably operated without applying the brake. It is determined that the stopped state cannot be maintained, and the routine ends without performing the stop processing of the electric oil pump 72. As described above, by determining whether or not to stop the operation of the electric oil pump 72 based on the oil temperature T, it is possible to quickly start up the hydraulic pressure at the time of restart, and to determine the current position of the vehicle. By determining whether or not to stop the operation of the electric oil pump 72 based on the gradient RG, the state of the vehicle can be considered.

On the other hand, if the operation state determination flag FM is 0 in step S220, that is, if the drive signal subsequently requests the stop state after performing the stop processing of the electric oil pump 72 in step S228, the counter It is determined whether C2 is less than threshold value CR2 (step S2).
32). This threshold value CR2 is used to start the electric oil pump 72 when the operation of the electric oil pump 72 is stopped, despite the fact that the drive signal requests the stop state. Things. When the electric oil pump 72 is started after being stopped for a long time and when started after being stopped for a short time, the degree of drop of the oil from the actuators of each part is different, so that it is necessary for the hydraulic oil to rise. Time changes. The time required for the hydraulic pressure to rise is large, resulting in a large variation and a lack of smooth operation. Therefore, when a predetermined time has elapsed since the operation was stopped, the operation is started once. Here, since the degree of the oil falling from the actuator changes depending on the oil temperature T, in the embodiment, the threshold value CR2 is set based on the oil temperature T, and the timing at which the electric oil pump 72 is forcibly started is determined by the oil temperature. Based on T. In the embodiment, the relationship between the oil temperature T and the threshold value CR2 is set such that the higher the oil temperature T is, the easier the oil comes off from the actuator. Therefore, the higher the oil temperature T is, the smaller the threshold value CR2 becomes. ing.

When the value of the counter C2 is less than the threshold value CR2, it is determined that the stop state may be continued, and the counter C2 is incremented (step S234), and the oil temperature T is read again (step S236). The threshold value SCR2 is set based on T (step S23).
8), this routine ends. The reason why the threshold value CR2 is changed in this way is that the oil temperature T also changes in accordance with a change in time.

When the value of the counter C2 is equal to or larger than the threshold value CR2, it is determined that a restart is necessary, and a start process from step S206 is performed. When such a forced start is started, the start determination flag FS is set to a value of 1 in step S208. Therefore, even if the drive signal requests a stop state, the stop processing is not performed until the start is completed. Of course, if the drive signal still requests the stop state when the activation is completed, the stop processing is performed according to the stop processing after step S224.

The power transmission device 2 of the second embodiment described above
According to FIG. 0B, when a predetermined time has elapsed after the operation of the electric oil pump 72 was stopped, the startup of the electric oil pump 72 was started despite the fact that the operation state was not requested. Can be prevented. As a result, the hydraulic pressure can always be quickly raised. In addition, since the forced start is determined based on the oil temperature T, there is no unnecessary start.
In addition, since the stop processing is not performed until the startup is completed during the startup, the processing can be performed consistently, and an unreasonable load is not applied to the electric oil pump 72.

Further, according to the power transmission device 20B of the second embodiment, when the oil temperature T is not within the predetermined temperature range, the operation of the electric oil pump 72 is not stopped. Starting in the state can be avoided. Further, according to the power transmission device 20B of the second embodiment, when the gradient RG of the current position of the vehicle is large and the vehicle cannot be stably stopped without the action of the brake, the electric oil pump 72 is switched off. Since the vehicle does not stop, it is possible to prevent the driver from unexpectedly moving the vehicle based on the gradient.

Of course, the power transmission device 20 of the second embodiment
According to B, at startup, the target rotation speed Nm * of the oil pump motor 73 is temporarily set to a rotation speed higher than the normal rotation speed Nset, and the target line pressure P * is set to a pressure higher than the normal line pressure Pset. , The hydraulic pressure can be raised quickly.

In the power transmission device 20B of the second embodiment, the threshold value CR2 is set based on the oil temperature T. However, the predetermined value may be set as the threshold value CR2. When the oil temperature T is not within the predetermined range,
Although the stop processing is not performed, the stop processing may be performed regardless of the oil temperature T.

In the power transmission device 20B of the second embodiment, the normal rotation speed Ns is temporarily reduced to the target rotation speed Nm * at startup.
set a higher rotational speed than the target line pressure P
* Is set to a pressure higher than the normal line pressure Pset, but only the target rotation speed Nm * is set to a rotation speed higher than the normal rotation speed Nset.
A pressure greater than the normal line pressure Pset may be set only for *.

In the power transmission device 20B of the second embodiment, the start is completed even if the drive signal requests the stop state during the start, but the stop processing may be performed during the start. However, it is preferable to complete the startup for the forced startup performed when a predetermined time has elapsed while the operation of the electric oil pump 72 is stopped.

In the power transmission device 20 of the first embodiment and the power transmission device 20B of the second embodiment, control is performed by operating or stopping the electric oil pump 72. However, the electric oil pump 72 is operated normally. Alternatively, the control may be performed depending on whether the operation is performed in a state where the rotation speed is reduced, and the control may be applied to this. In this case, the operation may be performed at a reduced rotation speed instead of stopping the operation.

In the power transmission device 20 of the first embodiment and the power transmission device 20B of the second embodiment, the hydraulic torque converter 50 and the stepped transmission 60 are provided. May be continuously changed, and may be provided with a continuously variable transmission (CVT) having a hydraulically controlled clutch. In the power transmission device 20 of the first embodiment and the power transmission device 20B of the second embodiment, the engine 30 and the motor 4
0 and configured to be mounted on a hybrid vehicle that drives the vehicle, but does not have a motor that drives the vehicle, automatically stops the engine if the vehicle is stopped and a predetermined condition is satisfied, An engine automatic stop device that automatically starts the engine when the predetermined condition is not satisfied and restarts the operation may be provided.

In the power transmission device 20 of the first embodiment and the power transmission device 20B of the second embodiment, a synchronous motor is used as the motor 40, but any type of motor that can output power to the crankshaft 32 is used. It may be.

In the power transmission device 20 of the first embodiment and the power transmission device 20B of the second embodiment, the power transmission device 20 is mounted on an automobile. It may be mounted on such as.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and can be implemented in various forms without departing from the gist of the present invention. Of course.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a schematic configuration when a power transmission device 20 according to an embodiment of the present invention is mounted on a vehicle.

FIG. 2 is an explanatory diagram illustrating a driving force source traveling region in the hybrid vehicle according to the embodiment.

FIG. 3 shows the HVECU 80 of the power transmission device 20 according to the embodiment.
4 is a flowchart illustrating an example of a processing routine at the time of starting driving of an electric oil pump, which is executed by a CPU 82 provided in the CPU.

FIG. 4 is a map showing an example of a relationship between an oil temperature T and a correction term f (T).

FIG. 5 is a time chart schematically illustrating the relationship between the rotation speed Nm and the oil pressure at the start of driving of the oil pump motor 73 in a time series.

FIG. 6 is a flowchart illustrating an example of a processing routine at the time of starting driving of an electric oil pump according to a modified example.

FIG. 7 shows the HVEC of the power transmission device 20B according to the second embodiment.
It is a part of a flowchart showing an example of an electric oil pump control routine executed in U80.

FIG. 8 shows the HVEC of the power transmission device 20B according to the second embodiment.
It is a part of a flowchart showing an example of an electric oil pump control routine executed in U80.

[Explanation of symbols]

20, 20B power transmission device, 30 engine, 32
Crankshaft, 34 engine speed sensor, 38
EGECU, 40 motor, 42 rotor, 43 permanent magnet, 44 stator, 45 three-phase coil, 46 M
GECU, 48 battery, 50 torque converter, 5
2 pump impeller, 54 turbine liner, 56 one-way clutch, 58 stator, 60 transmission, 6
2 planetary gear mechanism, 64 ATECU, 66 drive shaft,
67 differential gears, 68, 69 drive wheels,
68a, 69a Wheel speed sensor, 70 mechanical oil pump, 72 electric oil pump, 73 oil pump motor, 74 motor speed sensor, 76 oil temperature sensor, 80 HVECU, 82 CPU, 84 ROM,
86 RAM, 87 starter switch, 88 indicator, 89 gradient sensor, 90 accelerator pedal, 91
Accelerator pedal position sensor, 92 brake pedal, 93 brake pedal position sensor, 94
Brake master cylinder, 95 brake oil pressure sensor, 96 shift lever, 97 shift position sensor, 98 side brake lever, 99 brake switch, C1, C2 clutch.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seishi Nakamura 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Masaya Amano 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation ( 72) Inventor Hirojun Endo 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (72) Inventor Kazumi Hoshiya 1 Toyota Town Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Oba Hideyo 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (20)

[Claims] 1. An electric hydraulic pressure generating means capable of generating a hydraulic pressure required to operate an engaging means for transmitting power from an internal combustion engine to a drive shaft, wherein said electric hydraulic pressure generating means is provided when a predetermined condition is satisfied. The electric hydraulic pressure generating means is controlled so that the generation of the hydraulic pressure is stopped or the hydraulic pressure is decreased, and the electric hydraulic pressure generating means is controlled so that the required hydraulic pressure is generated when the conditions for generating the hydraulic pressure are satisfied. A hydraulic control device comprising: a start-up control unit that controls the electric hydraulic pressure generation unit such that a hydraulic pressure larger than the required hydraulic pressure is generated when a condition for generating the hydraulic pressure is satisfied. 2. The hydraulic control device according to claim 1, wherein the electric hydraulic pressure generation means includes a drive motor having a variable number of revolutions as a hydraulic drive source, and the start-up control means includes a drive motor. A hydraulic control device for driving and controlling the drive motor such that the number of revolutions becomes higher than the number of revolutions at which the required hydraulic pressure is generated. 3. The hydraulic control device according to claim 2, further comprising a state determination unit that determines a state of the drive shaft, wherein the start-up control unit determines a state of the drive shaft determined by the state determination unit. Target rotation speed setting means for setting a target rotation speed of the drive motor at the time of starting the drive of the electric hydraulic pressure generation device on the basis of the above, and the drive motor so that the drive motor is driven at the set target rotation speed And a drive motor control means for controlling the operation of the hydraulic control device. 4. The hydraulic control device according to claim 3, wherein the state determination unit is a unit that determines whether an occurrence of a request for rapid acceleration of the drive shaft by an operator is predicted. The target rotation speed setting means sets the target rotation speed of the drive motor to a first speed when the state determination means does not determine that the state of the drive shaft is a state in which the occurrence of the sudden acceleration request is predicted. When the state determination means determines that the state of the drive shaft is a state in which the occurrence of the request for rapid acceleration is predicted, the target rotation number of the drive motor is set to the first rotation. A hydraulic control device which is a means for setting the rotation speed to a second rotation speed higher than the rotation speed. 5. The state determining means is means for determining that a sudden acceleration request is expected to occur when at least power can be transmitted to a drive shaft via the engaging means. 5. The hydraulic control device according to claim 4, wherein: 6. The hydraulic control device according to claim 4, further comprising: drive shaft fixing means capable of fixing the drive shaft in a state in which rotation of the drive shaft is stopped, wherein the state determination means includes the drive shaft fixing means. The hydraulic control device is means for determining that the occurrence of the request for rapid acceleration is predicted when the drive shaft is not fixed. 7. The hydraulic control device according to claim 4, further comprising: a drive shaft braking unit capable of applying a braking force to the drive shaft, wherein the state determination unit performs the driving by the drive shaft braking unit. A hydraulic control device, which is means for determining whether or not a request for rapid acceleration is predicted based on a braking force applied to a shaft. 8. The state determination means is a state in which the occurrence of the request for rapid acceleration is predicted when a braking force applied to the drive shaft by the drive shaft braking means falls below a predetermined force. The hydraulic control device according to claim 7, wherein the hydraulic control device is means for determining. 9. The state judging means predicts the occurrence of the request for the rapid acceleration when the rate of change in the negative direction of the braking force applied to the drive shaft by the drive shaft braking means is equal to or greater than a predetermined value. 8. A means for judging a state of being performed.
The hydraulic control device as described. 10. The hydraulic control device according to claim 3, further comprising: a temperature detection unit configured to detect a temperature of oil used for the hydraulic pressure, wherein the target rotation speed setting unit is configured to detect the temperature by using the temperature detection unit. A hydraulic control device that is means for setting the target rotation speed based on the detected temperature of the oil. 11. The hydraulic control device according to claim 10, wherein the target rotation speed setting means sets a higher rotation speed as the oil temperature is lower as the target rotation speed. 12. The hydraulic control device according to claim 1, wherein the electric hydraulic pressure generating unit includes a line pressure changing unit that changes a line pressure of a hydraulic line reaching the engaging unit. The hydraulic control device, wherein the startup control unit is a unit that controls the line pressure changing unit so that a line pressure of the hydraulic line is increased. 13. An electric hydraulic pressure generating means capable of generating a hydraulic pressure necessary for operating an engaging means for transmitting power from an internal combustion engine to a drive shaft, wherein said electric hydraulic pressure generating means is provided when a predetermined condition is satisfied. The electric hydraulic pressure generating means is controlled so that the generation of the hydraulic pressure is stopped or the hydraulic pressure is decreased, and the electric hydraulic pressure generating means is controlled so that the required hydraulic pressure is generated when the conditions for generating the hydraulic pressure are satisfied. A hydraulic control device for performing the hydraulic pressure generation for a predetermined time when the predetermined condition is satisfied and the required hydraulic pressure is stopped or the hydraulic pressure is reduced. A hydraulic control apparatus comprising: a hydraulic pressure regeneration control unit that controls the electric hydraulic pressure generation unit so as to generate the required oil pressure even when a condition for generating oil pressure is not satisfied. 14. The electric-hydraulic-pressure generating means controls the electric-hydraulic-pressure generating means until the required hydraulic pressure is generated, even though the predetermined condition is satisfied, until the required hydraulic pressure is generated. 14. The hydraulic control device according to claim 13, which is a means for controlling. 15. The hydraulic control device according to claim 13, further comprising a temperature detecting unit that detects a temperature of oil used for the hydraulic pressure, wherein the hydraulic pressure regenerating unit detects the temperature detected by the temperature detecting unit. A hydraulic control device comprising a predetermined time setting means for setting the predetermined time based on oil temperature. 16. The hydraulic control device according to claim 15, wherein said predetermined time setting means is means for setting said predetermined time short when said oil temperature is outside a predetermined temperature range. 17. An electric hydraulic pressure generating means capable of generating a hydraulic pressure required to operate an engaging means for transmitting power from an internal combustion engine to a drive shaft, wherein said electric hydraulic pressure generating means is provided when a predetermined condition is satisfied. The electric hydraulic pressure generating means is controlled so that the generation of the hydraulic pressure is stopped or the hydraulic pressure is decreased, and the electric hydraulic pressure generating means is controlled so that the required hydraulic pressure is generated when the conditions for generating the hydraulic pressure are satisfied. Temperature control means for detecting the temperature of oil used for the hydraulic pressure, and state setting for setting the stop of generation of the required hydraulic pressure or the reduction of the hydraulic pressure based on the detected temperature. And a state control means for controlling the electric hydraulic pressure generation means to be in the set state. 18. The hydraulic control device according to claim 17, wherein said state setting means sets a state in which said required oil pressure is generated when said oil temperature is outside a predetermined temperature range. 19. An electric hydraulic pressure generating means capable of generating a hydraulic pressure necessary for operating an engaging means for transmitting power from an internal combustion engine to a drive shaft, wherein said electric hydraulic pressure generating means is provided when a predetermined condition is satisfied. The electric hydraulic pressure generating means is controlled so that the generation of the hydraulic pressure is stopped or the hydraulic pressure is decreased, and the electric hydraulic pressure generating means is controlled so that the required hydraulic pressure is generated when the conditions for generating the hydraulic pressure are satisfied. A hydraulic pressure control device mounted on a vehicle, wherein: a gradient detecting means for detecting a gradient of a current position of the vehicle; And a state control means for controlling the electric hydraulic pressure generation means to be in the set state. 20. The hydraulic control device according to claim 19, wherein said state setting means sets a state in which said required oil pressure is generated when said gradient is equal to or greater than a predetermined gradient.