JPH1094295A - Control method and control device for belt-driven generator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When a belt slip occurs, the load torque of the generator is temporarily reduced without increasing the rotation speed of the internal combustion engine while securing the expected power generation amount while slipping the V-belt. By lowering the control, the belt slip is eliminated early and the power generation efficiency is improved. SOLUTION: The control device of the belt-driven generator includes:
The internal combustion engine is started and its rotational force is generated by a belt
When the storage battery 2 is charged by the power generation of this generator, the main controller causes the actual speed ratio NE / NG between the rotation speed NE of the internal combustion engine and the rotation speed NG of the generator to be transmitted.
When the actual speed ratio deviates from the allowable range VH to VL, it is determined that a belt slip has occurred, and the load of the generator is reduced by a predetermined width Δ
By controlling the actual speed ratio to be the designed speed ratio by lowering by P, the belt slip is eliminated, the rotation speed of the generator is maintained, and a decrease in power generation efficiency is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a series hybrid electric vehicle in which a rotating power of an internal combustion engine is transmitted by a belt such as a V-belt to drive a generator and a storage battery is charged by the power generated by the generator. The present invention relates to a control method and a control device for a belt-driven generator.

[0002]

2. Description of the Related Art Conventionally, as a control method and a control device for such a belt-driven generator, for example, Japanese Patent Application Laid-Open No.
No. 5306. The control method and the control device of the conventional belt-driven generator, when the remaining capacity of the storage battery is reduced to a predetermined value or less, the internal combustion engine is driven to drive the generator, and when the storage battery is recharged, the generator The rotation speed of the generator is monitored, and the rotation speed of the internal combustion engine is controlled based on the rotation speed, so that the rotation of the generator is kept constant even if a slip occurs in the generator drive belt.

[0003]

However, in such a conventional control method and control apparatus for a belt-driven generator, the purpose is to precisely control the charging of the storage battery.
Instead of monitoring the rotation speed of the internal combustion engine itself and controlling the rotation speed to a predetermined value, instead of monitoring the rotation speed of the generator and slipping on the drive belt, the rotation speed of the generator slows down However, since the engine speed is controlled to keep the generator speed constant by increasing the engine speed by observing the decrease in the engine speed, the belt slip becomes excessive due to high load power generation or deterioration over time. However, there is a problem that the power generation is continuously performed, the power generation efficiency is significantly deteriorated, and a desired power generation amount cannot be obtained.

The present invention has been made in view of such conventional problems, and calculates the actual speed ratio from the rotational speed of the internal combustion engine and the rotational speed of the generator, and greatly calculates the actual speed ratio from the designed speed ratio. Provided is a control method and a control apparatus for a belt-driven generator that determines that a belt slip has occurred when it changes, reduces the load on the generator to eliminate the belt slip, and prevents a large decrease in power generation efficiency. The purpose is to:

[0005] The present invention also reduces the load on the generator and increases the rotation speed of the internal combustion engine when the actual speed ratio between the rotation speed of the internal combustion engine and the rotation speed of the generator changes more than the design speed ratio. It is an object of the present invention to provide a control method and a control device for a belt-driven generator, which can eliminate a belt slip to prevent a large decrease in power generation efficiency and maintain a required power generation amount before the occurrence of a belt slip. I do.

[0006]

According to a first aspect of the present invention, there is provided a belt-driven generator control method which calculates an actual speed ratio between a rotation speed of an internal combustion engine and a rotation speed of a generator. When it deviates from the allowable range for the design speed ratio, it is determined that belt slip has occurred, the load on the generator is reduced by a predetermined amount, and the actual speed ratio is controlled so as to become the design speed ratio. Eliminates belt slip to maintain the rotation speed of the generator and prevent reduction in power generation efficiency.

According to a second aspect of the present invention, in the control method of the belt-driven generator according to the first aspect, the load on the generator is reduced by a predetermined amount and the rotational speed of the internal combustion engine is increased by a predetermined amount. The control is performed to secure the previous required power generation amount, thereby eliminating the belt slip and preventing the power generation amount from decreasing.

According to a third aspect of the present invention, in the method of controlling a belt-driven power generator according to the second aspect, when it is determined that the belt slip has occurred, the remaining capacity of the storage battery is compared with a predetermined value and exceeds the predetermined value. If so, the load of the generator is reduced by a predetermined amount to control the actual speed ratio to become a set speed ratio, and if the actual speed ratio does not exceed the predetermined value, the load of the generator is reduced by a predetermined amount. At the same time, the rotation speed of the internal combustion engine is controlled to be increased by a predetermined amount so as to secure the required power generation amount before the belt slip.

In the control method of the belt-driven generator according to the third aspect of the present invention, when the belt for transmitting the torque of the internal combustion engine to the generator slips while the storage battery is being charged, the remaining capacity of the storage battery is small. In a state where the need for charging is large, the belt slip is eliminated to prevent a decrease in power generation efficiency and to secure the required amount of power generation for early charging of the storage battery.The remaining capacity of the storage battery is not so small and the need for charging is low. In a state that is not so large, the generation of noise due to an increase in the rotation of the internal combustion engine is suppressed only by eliminating the belt slip and preventing a decrease in the power generation efficiency.

According to a fourth aspect of the present invention, in the control method of the belt-driven generator according to the third aspect, the predetermined value of the remaining capacity of the storage battery is set to 50%. When the belt that transmits power to the generator slips, if the remaining capacity of the storage battery is 50% or less, it is necessary to charge the battery. Therefore, it is necessary to eliminate the belt slip to prevent a decrease in power generation efficiency and secure the required power generation. If the remaining capacity of the storage battery exceeds 50%, the necessity of charging is not so large, the belt slip is eliminated to prevent a decrease in the power generation efficiency and to increase the rotation of the internal combustion engine. Reduce noise generation.

According to a fifth aspect of the present invention, there is provided a belt-driven generator control apparatus comprising: a generator for charging a storage battery; an internal combustion engine for driving the generator via a belt; and a rotation speed of the internal combustion engine. Speed ratio calculating means for calculating an actual speed ratio between the motor and the rotating speed of the generator, and the actual speed ratio calculated by the speed ratio calculating means is monitored. A belt slip monitoring unit that determines that a belt slip has occurred, and a power generation that controls the actual speed ratio to be the designed speed ratio by reducing the load on the generator by a predetermined amount. Machine control means.

In the control device for a belt-driven generator according to the fifth aspect of the present invention, the internal combustion engine is started, the torque is transmitted to the generator by the belt and rotated, and the storage battery is charged by the power generated by the generator. The actual speed ratio between the rotation speed of the internal combustion engine and the rotation speed of the generator is calculated by the speed ratio calculation means, and when the actual speed ratio deviates from the allowable range for the design speed ratio, the belt slip monitoring means It is determined that belt slip has occurred. In response to this, the generator control means reduces the load on the generator by a predetermined amount and controls the actual speed ratio to be the designed speed ratio, thereby eliminating the belt slip and maintaining the rotation speed of the generator, Prevents reduction in power generation efficiency.

According to a sixth aspect of the present invention, in the control device for a belt-driven generator according to the fifth aspect, when the belt slip monitoring means determines that a belt slip has occurred, the generator control means reduces the load on the generator. An internal combustion engine control means for decreasing the rotation speed and increasing the rotation speed of the internal combustion engine by a predetermined amount to secure the required power generation amount before the occurrence of the belt slip.

In the control apparatus for a belt-driven generator according to the present invention, when the belt slip monitoring means determines that belt slip has occurred during charging of the storage battery, the generator control means reduces the load on the generator by a predetermined amount. By lowering and controlling the actual speed ratio to become the set speed ratio, and simultaneously controlling the internal combustion engine control means to increase the rotation speed of the internal combustion engine by a predetermined amount and secure the required power generation amount before the belt slip. In addition, a belt slip is eliminated to prevent a reduction in power generation efficiency, and a required power generation amount is secured to achieve early charging of the storage battery.

According to a seventh aspect of the present invention, in the control device for a belt-driven generator according to the sixth aspect, the storage battery monitoring means for monitoring the remaining capacity of the storage battery, and the remaining capacity monitored by the storage battery monitoring means is a predetermined value. A charging method selecting means for operating only the generator control means at the time above and operating the internal combustion engine control means together with the generator control means when the remaining capacity is equal to or less than a predetermined value.

In the control device for a belt-driven generator according to the present invention, when the belt for transmitting the rotational force of the internal combustion engine to the generator slips during charging of the storage battery, the charging method selection means sets the storage battery monitoring means. If it is determined that the necessity of charging is large because the remaining capacity of the storage battery to be monitored is small, the load on the generator is reduced by the generator control means to eliminate the belt slip, thereby preventing the reduction in the power generation efficiency, The internal-combustion-engine control means increases the rotation speed of the internal-combustion engine to secure the required amount of power generation, thereby achieving early charging of the storage battery. On the other hand, if the charging method selecting means determines that the storage capacity of the storage battery is not so small and the necessity of charging is not so large,
The generator control means reduces the load on the generator, eliminates belt slip and only prevents a decrease in power generation efficiency, and suppresses the generation of noise due to an increase in rotation of the internal combustion engine.

According to an eighth aspect of the present invention, in the control apparatus for a belt-driven generator according to the seventh aspect, the predetermined value of the remaining capacity of the storage battery is set to 50%. When the belt that transmits the rotational force of the engine to the generator slips, if the remaining capacity of the storage battery is 50% or less, it is necessary to charge the battery. Therefore, the belt slip is eliminated to prevent a decrease in the power generation efficiency and to generate the required power. In order to secure the battery capacity and charge the storage battery early, the remaining capacity of the storage battery is 5
If it exceeds 0%, the necessity of charging is not so large, so that belt slip is eliminated to prevent a decrease in power generation efficiency, and noise generation due to an increase in rotation of the internal combustion engine is suppressed.

According to a ninth aspect of the present invention, in the control apparatus for a belt-driven generator according to any one of the fifth to eighth aspects, an alarm means for issuing an abnormality report when the slip determining means determines that a belt slip has occurred. When a belt slip occurs, the driver is notified of the occurrence of an abnormality together with the load reduction control of the generator and / or the rotation speed increase control of the internal combustion engine.

[0019]

According to the control method of the belt-driven generator according to the first aspect of the present invention and the control apparatus of the belt-driven generator according to the fifth aspect of the present invention, the internal combustion engine is switched from the internal combustion engine to the generator during the charging operation of the storage battery. When a slip occurs in the belt transmitting the driving force, the belt slip is eliminated, the rotation speed of the generator is maintained, and a decrease in power generation efficiency can be prevented.

According to the control method of the belt-driven generator of the second invention and the control device of the belt-driven generator of the sixth invention, the driving force from the internal combustion engine to the generator during the charging operation of the storage battery. When the belt that transmits
This eliminates the belt slip and also prevents a decrease in the amount of power generation, thereby enabling early charging.

According to the control method of the belt-driven generator of the third aspect and the control device of the belt-driven generator of the seventh aspect, the torque of the internal combustion engine is supplied to the generator while the storage battery is being charged. When the transmission belt slips and the need for charging is large because the remaining capacity of the storage battery is small, the belt slip is eliminated to prevent a decrease in power generation efficiency and to secure the required amount of power generation to charge the storage battery early. In a state where the remaining capacity of the storage battery is not so small and the necessity of charging is not so large, it is necessary to eliminate the belt slip and only prevent the decrease in the power generation efficiency and suppress the generation of noise due to the increase in the rotation of the internal combustion engine. Can be.

According to the control method of the belt driven generator of the invention of claim 4 and the control apparatus of the belt driven generator of the invention of claim 8, the torque of the internal combustion engine is supplied to the generator while the storage battery is being charged. When the transmission belt slips, if the remaining capacity of the storage battery is 50% or less, it is necessary to charge the storage battery. Therefore, it is necessary to eliminate the belt slip to prevent a decrease in the power generation efficiency and secure the required power generation amount to quickly start the storage battery. If charging is attempted, if the remaining capacity of the storage battery exceeds 50%, the necessity of charging is not so large, so that belt slip is eliminated to prevent a decrease in power generation efficiency and to reduce the generation of noise due to an increase in rotation of the internal combustion engine. Can be suppressed.

According to the control apparatus for a belt-driven generator according to the ninth aspect of the present invention, when a belt slip occurs, control is performed to reduce the load on the generator and / or increase the rotational speed of the internal combustion engine, and notify the driver of the occurrence of abnormality. I can let you know.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a series hybrid electric vehicle control apparatus using a control apparatus for a belt-driven generator according to a first embodiment of the present invention. U, V, W
A drive motor 1 for driving a vehicle, which is a three-phase induction motor, is rotationally driven by the output of an inverter 3 that converts DC power of a storage battery 2 into desired AC power. The drive motor 1 is provided with a speed reducer 4 for reducing the rotational output, and the left and right wheels 5a and 5b are driven by a differential device (not shown) provided in the speed reducer 4. .

An internal combustion engine 6 is provided as a motive power source for charging the storage battery 2 and also supplying power to the drive motor 1 when the storage battery power is insufficient. The internal combustion engine 6 includes a generator 7. The V-belt 8 is connected to receive the driving force of rotation.

The internal combustion engine 6 is started by a starter 9, and the rotation speed is controlled to increase or decrease by a throttle 10. The three-phase AC power generated by the generator 7 is converted into DC power by the converter 11 to charge the storage battery 2,
Input to the inverter 3.

The internal combustion engine 6 has an internal combustion engine controller (EC
The internal combustion engine controller 12 is operated by receiving start, stop, rotation speed commands, and the like from a main controller (EV-ECU) 13 that controls the operation of the entire electric vehicle.

In order to control the operation of these drive systems,
A rotation sensor 14 is attached to the drive motor 1, measures a rotation speed of a rotor (not shown) of the drive motor 1, and transmits a detection signal to a main controller (EV-ECU) 13. The speed reducer 2 is provided with a vehicle speed sensor 15 for measuring the running speed of the vehicle and transmitting a detection signal to the main controller 13 and a speed meter (not shown).

A rotation sensor 16 is attached to the internal combustion engine 6 to measure the rotation speed of the internal combustion engine 6 and transmit a detection signal to the internal combustion engine controller 12 and the main controller 13. The rotation sensor 17 is also attached to the generator 7 to measure the rotation speed of the generator 7 and
3 and transmits the detection signal.

The electric power is generated by the generator 7 and the converter 11
The power generated by the storage battery 2 is controlled by the main controller 13 and the generator controller (GC) 18. Note that the storage battery 2 can be connected to a charger 19 so that it can be charged from a charging stand or a home power supply.

The storage battery 2 is a storage battery controller (BC) 2
With 0, the charge amount and the discharge amount (remaining capacity) are monitored and managed. The storage battery controller 20 receives a charge start command, a charge stop command, and the like from the main controller 13. The inverter 3 is monitored and managed by the motor controller (MC) 21 for the voltage, current, and frequency of the drive power output to the drive motor 1.

The main controller 13 has a select lever 22
In response to the position information of the accelerator pedal 23, the depression amount information of the accelerator pedal 23, the depression information of the brake pedal 24, and the position information of the start key 25, the output to be instructed to the drive motor 1 and the number of rotations are calculated and instructed to the motor controller 21. When the main controller 13 detects the occurrence of the belt slip, the main controller 13 operates the alarm device 26 to sound the buzzer and turns on the warning lamp to notify the driver.

Next, the control operation of the above-described series hybrid electric vehicle control device will be described. First, an outline of the control operation will be described. When the storage battery 2 has a sufficient remaining capacity, the driver turns on the start key 25, sets the select lever 22 to the D or R range, and depresses the accelerator pedal 23, whereby the main controller (EV- The ECU 13 gives the motor controller (MC) 21 an output voltage, a current, and a frequency command capable of generating a start torque together with a drive command, and the motor controller 21 receiving the command gives control of the voltage and the frequency of the inverter 3 and the storage battery 2. Is converted into three-phase AC power of a desired voltage and frequency and supplied to the drive motor 1 to start the vehicle.

After the start of the vehicle, the inverter 3 is controlled in response to an increase or decrease in the amount of depression of the accelerator pedal 23 by the driver to adjust the power supplied to the drive motor 1, thereby controlling the torque and speed of the drive motor 1. Do.

The storage battery controller (BC) 20 monitors the remaining capacity of the storage battery 2 based on the battery voltage, and issues a charge request to the main controller 13 when the remaining capacity drops to a preset charging start point.
Gives a start command to the internal combustion engine controller (ECCS) 12. Upon receiving the start command, the internal combustion engine controller 12 activates the starter 9 to start the internal combustion engine 6, and controls the opening and closing of the throttle 10 based on the detection signal of the rotation sensor 16 so as to obtain the desired driving force of the internal combustion engine 6. .

The driving force of the internal combustion engine 6 is a V-belt 8
The generator 7 rotates to generate three-phase AC power, and the three-phase AC power is converted into DC power by the converter 11 to charge the storage battery 2. The power generation command of the generator 7 is given from the main controller 13 to the generator controller (GC) 18. The generator controller 18 controls the converter 11 while monitoring the voltage and current of the power generated by the generator 7. Thus, the power generated by the generator 7 is controlled.

When the charging voltage of the storage battery 2 rises to the charging stop point, the storage battery controller (BC) 20 issues a charging stop request to the main controller 13, and a stop command is given from the main controller 13 to the internal combustion engine controller 12. 6 is stopped.

During the power generation operation of the internal combustion engine 6 and the generator 7, the rotation speed of the internal combustion engine 6 and the rotation speed of the generator 7 measured by the rotation sensors 16 and 17 are monitored by the main controller 13, respectively. It is used for belt slip control described later.

In this manner, the remaining capacity of the storage battery 2 is constantly monitored, and when the remaining capacity decreases to the charging start point, the internal combustion engine 6 is started to generate electric power by the generator 7, and the storage battery 2
When the remaining capacity rises to the charging stop point, the operation of stopping power generation is repeated, and the drive motor 1 is driven mainly by the power of the storage battery 2 to run the vehicle.

In such a control operation of the series hybrid electric vehicle control device, the output characteristic of the generator 7 with respect to the rotation speed of the internal combustion engine (engine) 6 when the V-belt 8 is not slipping is usually represented by a curve in FIG. There is a relationship shown in FIG. 7A, which is a characteristic that the generator output increases in proportion to the rotation speed of the internal combustion engine 6. FIG. 3 shows this normal generator output characteristic in terms of engine characteristics.
The characteristic shows that the driving torque of the generator 7 increases in proportion to the number of rotations. In FIG. 3, the contour lines represent the fuel economy lines, and the more the center, the better the fuel economy.

FIG. 4 shows the charge / discharge characteristics of the storage battery 2.
The storage battery characteristics in FIG.
C), the vertical axis shows the storage battery voltage, and the storage battery 2
As the remaining capacity of the battery decreases, the battery voltage also gradually decreases,
It shows the characteristic that the voltage suddenly drops at a certain point. Therefore, practically, the point at which the voltage sharply drops is set to 0% of the remaining capacity.

When the storage battery 2 is being charged, the storage battery voltage rises from the lower right to the left in the characteristic curve of FIG. 4, but the charging completion point B1 is at the regenerative charge (when the drive motor 1 (The operation of charging the storage battery 2 with the regenerative electric power). The point at which recharging is started when the voltage of the storage battery 2 is reduced by discharging, that is, the charging start point B2 is taken out of the storage battery 2 when the output (power consumption) of the drive motor 1 is larger than the power generation capacity. In consideration of the above, the remaining capacity is set at 30%.

As shown in FIG. 5, the output characteristic of the drive motor 1 is set so that the maximum output characteristic P1 is almost twice the rated output characteristic P0.

In such a setting, the main controller (EV-ECU) 13 controls the internal combustion engine 6 and the generator 7 based on the flowchart shown in FIG. It is determined whether or not the power is currently being generated (step S1). If the power is being generated, the rotational speed NE of the internal combustion engine (Eng rotational speed) NE is read from the rotation sensor 16 (step S2), and the power of the generator is detected from the rotation sensor 17 Rotation speed N
G is read (step S3), and the actual speed ratio NG / NE is calculated (step S4).

Subsequently, the obtained actual speed ratio is compared with a design speed ratio upper limit value VH and a speed ratio lower limit value VL, which are set in advance, and it is determined whether the actual speed ratio is within the range (step S5). If so, it is determined that belt slip has not occurred, and the remaining capacity of the storage battery 2 is taken in from the storage battery controller 20 to determine whether the battery voltage has risen to the charging stop point B1 (step S6). ). If the battery voltage has not risen to the charging stop point B1, it is determined that power generation should be continued, and the process returns (step S10).

In the comparison between the battery voltage (remaining capacity) in step S6 and the charging stop point B1, if the remaining capacity has increased to the charging stop point B1, a power generation stop command is output to the internal combustion engine controller 12 and the generator controller 18. And the internal combustion engine 6
Is stopped before returning (steps S7 to S7).
9).

However, the actual speed ratio NE / N in step S5
In the comparison between G and the design speed ratio, if the actual speed ratio has changed beyond a certain range of the design speed ratio, it is determined that belt slip has occurred, and power generation is performed as shown by curves B in FIGS. A command to reduce the power generation output of the generator 7 from P0 to P1 by one step ΔP is output to the generator controller 18 (step S1).
1) Then, the buzzer of the alarm device 26 is sounded and the warning lamp is turned on, or one of them is operated to notify the driver of the abnormality (step S).
12), and then return (step S13).

In this way, when the belt slip occurs, the control for reducing the power output of the generator 7 by one step ΔP while maintaining the rotation speed of the internal combustion engine 6 as it is is performed as shown in FIGS. A command to decrease the output command of the engine by ΔP is given to the generator controller 18 to reduce the generator load by one step, and the output torque of the internal combustion engine 6
That is, the driving torque for the generator 7 is changed to the current torque P0.
Is given to the internal combustion engine controller 12 so that the torque P1 becomes lower by ΔP from the above, and the control for slightly reducing the throttle 10 is performed. As a result, the output torque is reduced while maintaining the rotation speed of the internal combustion engine 6, that is, the rotation speed of the generator 7, so that belt slip is eliminated and re-adhesion is achieved.

If the belt slip is not eliminated by this one-time control, P1 → P2, P2 → P3,.
Belt slip is eliminated by repeating the control for decreasing the output torque of the generator 7 by P. The warning to the driver is issued in order to urge the driver to re-adjust the belt tension even if the belt slip has been resolved, since the belt tension needs to be readjusted.

The control routine for the internal combustion engine 6 and the generator 7 shown in FIG. 6 is periodically executed. If the power is not being generated when the main controller 13 enters this routine (step S1), the storage battery 2 is read from the storage battery controller 20, and it is determined whether or not the remaining capacity has decreased to the charging start point B2 (step S14). If the remaining capacity has not decreased, the process returns (step S1).
8).

However, if the remaining capacity of the storage battery 2 has dropped to the charging start point B2, charging is necessary. Therefore, a start command is given to the internal combustion engine controller 12, and a power generation start command is also output to the generator controller 18. To start power generation at a predetermined power generation amount (steps S15 to S1).
7).

As described above, in the control method and the control device of the belt-driven generator according to the first embodiment, FIG.
As shown in (a), when the generator 7 is operated at a load corresponding to the amount of power generation of 10 KW and the power is to be increased to 20 KW, t
If the belt slip occurs at 0, the average rotation speed ΔNE of the internal combustion engine 6 is maintained substantially constant as shown in FIG. 6B, but the average rotation speed of the generator 7 is maintained as shown in FIG. Since the speed ΔNG is greatly reduced, the actual speed ratio (here, as a ratio of the average rotation speed) ΔN as shown in FIG.
E / ΔNG also greatly decreases. Then, this actual speed ratio is compared with the design speed ratio upper limit value VH and the lower limit value VL. If the actual speed ratio deviates from the relationship of VH> actual speed ratio> VL, the generator load is set to a certain width at timing t1. Here, control is performed to reduce the generator drive torque by reducing the power generation amount by ΔP = 5 KW to eliminate the belt slip.

The control for reducing the load of the generator 7 is as follows.
The process is repeated step by step by ΔP until the belt slip is eliminated.

Thus, in the control method and the control device of the belt-driven generator according to the first embodiment, the rotation speed of the internal combustion engine is increased by ignoring the belt slip, and
Internal combustion engine 6 as compared to the case where the control for maintaining the power generation amount is performed.
Therefore, the power generation efficiency can be maintained at a high level by suppressing waste of fuel.

When a belt slip occurs, an alarm is issued together with the above-mentioned control to notify the driver, so that the driver can know the necessity of readjustment of the V-belt.

Next, a second embodiment of the present invention will be described with reference to the flowchart of FIG. 8 and the characteristic diagrams of FIGS. 9 and 10. The control method of the belt-driven generator and the functional configuration of the control device according to the second embodiment are the same as those of the first embodiment shown in FIG. 1, but when the main controller 13 detects the occurrence of belt slip. The method of controlling the internal combustion engine 6 and the generator 7 is different.

The feature of the second embodiment is that the storage battery 2
When a slip occurs in the V-belt 8 connecting the internal combustion engine 6 and the generator 7 during the charging operation, the load torque on the generator 7 side is reduced and, conversely, the rotation speed of the internal combustion engine 6 is increased to increase the belt speed. The point is to eliminate the slip and always secure the expected amount of power generation.

Therefore, as shown in the flowchart of FIG. 8, when the main controller 13 detects the occurrence of the belt slip during the power generation operation by the same judgment as in the first embodiment (steps S1 to S5), the main controller 13 proceeds to step S11. -1, the generator driving torque P is reduced by a constant ratio K (P ←
P / K, where K> 1), and in step S11-2, the rotational speed NE of the internal combustion engine (Eng) 6 (and consequently also the rotational speed NG of the generator 7) is increased by a constant ratio K (NE
← NE × K) Then, similarly to the first embodiment, control is performed to sound a buzzer or turn on a warning lamp by the alarm device 26 to notify the driver of the occurrence of the belt slip (step S12).

This control is repeatedly executed stepwise until the belt slip is eliminated, that is, until VH> actual speed ratio> VL. Note that all the other steps in the flowchart of FIG. 8 are the same as those in the first embodiment, and the same processing steps are denoted by the same step numbers, and description thereof is omitted.

As described above, according to the control method and the control device for the belt-driven generator of the second embodiment, FIG.
As shown in the correlation diagram between the internal combustion engine characteristics and the generator output characteristics shown in Fig. 7, when the occurrence of belt slip is detected, the internal combustion engine generated torque P0 (corresponding to the generator driving torque) / coefficient K (K> 1.0) = P1 to reduce the internal combustion engine generated torque (and, consequently, the generator driving torque) to match the internal combustion engine generated torque P1, and calculate the internal combustion engine rotational speed NE0 × K = NE1 to obtain the internal combustion engine By increasing the rotation speed of the engine 6 from NE0 to NE1, as shown in the generator output characteristic diagram of FIG. 9, as a result, the belt slip is eliminated while the power generation output of the generator 7 is maintained substantially constant. It controls. This control is repeated until the belt slip is eliminated.

Thus, according to the control method and the control device for the belt-driven generator of the second embodiment, even if a belt slip occurs, the belt slip can be maintained while maintaining a power generation amount substantially equal to that before the belt slip occurred. Can be controlled.

Next, a third embodiment of the present invention will be described with reference to FIG.
A description will be given based on the flowchart of FIG. The control method of the belt-driven generator and the functional configuration of the control device according to the third embodiment are the same as those of the first embodiment shown in FIG.
The method of controlling the internal combustion engine 6 and the generator 7 when the main controller 13 detects the occurrence of the belt slip differs from the first and second embodiments. When the slip of the V-belt 8 that connects the internal combustion engine 7 occurs, the rotation speed of the internal combustion engine 6 is maintained at the original value in the same manner as in the first embodiment according to the remaining capacity of the storage battery 2. A control is performed to reduce the belt slip by reducing only the driving load torque, or by reducing the load torque on the generator 7 side and increasing the rotation speed of the internal combustion engine 6 as in the second embodiment. It is characterized in that it is selected whether or not to perform a control for eliminating the slip and always ensuring the desired generated power.

The control operation performed by the main controller 13 in the third embodiment will be described with reference to the flowchart of FIG. When the main controller 13 detects the occurrence of the belt slip during the power generation operation by the same determination as in the first embodiment (steps S1 to S5), the main controller 13 proceeds to step S5.
The remaining capacity of the storage battery 2 input to the storage battery controller 20 after branching to 111 is a predetermined value B3 (= 50%, see FIG. 4).
If the value is higher than the predetermined value B3, no urgent charging is required. Therefore, it is possible to eliminate only the belt slip without increasing the rotation speed of the internal combustion engine 6 to increase noise. Then, the flow branches to step S112, and control is performed to reduce the load torque by reducing the power generation output of the generator 7 by ΔP as in the first embodiment.

However, if the remaining capacity of the storage battery 2 is lower than the predetermined value B3, the urgency of charging the storage battery 2 is high, so it is necessary to eliminate the belt slip while maintaining the amount of power generation. Branching to step S113, the generator drive torque P is reduced to 1 / K as in the second embodiment, and the process proceeds to step S114.
, A control is performed to increase the number of revolutions NE of the internal combustion engine (Eng) 6 (and eventually the number of revolutions NG of the generator 7) by K times.

After the control for eliminating the belt slip, the buzzer is sounded by the alarm device 26 or the warning lamp is turned on to notify the driver of the occurrence of the belt slip as in the first embodiment. (Step S12).

This control is repeatedly executed in steps until the belt slip is eliminated, that is, until VH> actual speed ratio> VL. All the other steps in the flowchart of FIG. 11 are the same as those in the first embodiment, and the same processing steps are denoted by the same step numbers, and description thereof is omitted.

Thus, according to the control method and the control device for the belt-driven generator of the third embodiment, the internal combustion engine 6 is started, the generator 7 is generated, and the storage battery 2 is being charged. A V-belt 8 connecting the internal combustion engine 6 and the generator 7
If the charging occurs until the remaining capacity exceeds the predetermined value B3 according to the magnitude of the remaining capacity of the storage battery 2, the urgency of charging the storage battery 2 is low, and the rotation of the internal combustion engine 6 The control is performed to reduce the load torque of the generator 7 only to eliminate the belt slip without increasing the noise by increasing the number. If the remaining capacity of the storage battery 2 is equal to or less than the predetermined value B3, the control of the storage battery 2 is performed. Since the urgency of charging is high, not only the load torque of the generator 7 is reduced to eliminate the belt slip, but also the rotation speed of the internal combustion engine 6 is further increased, and the rotation speed of the generator 7 is accordingly increased. This secures the power generation capacity and performs control so that the charging speed does not decrease.

In the first to third embodiments, the comparison reference values such as the charging completion point B1, the charging starting point B2, the remaining capacity predetermined value B3, and the design speed ratio upper limit value VH and lower limit value VL are as follows. The present invention is not particularly limited to those shown in the embodiments, but varies variously depending on the vehicle model, storage battery characteristics, internal combustion engine and generator characteristics, and appropriate values are set experimentally in accordance with these. can do.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a series hybrid electric vehicle control device using a first embodiment of the present invention.

FIG. 2 is an output characteristic diagram of the generator according to the first embodiment of the present invention.

FIG. 3 is a correlation diagram between the output characteristics of the internal combustion engine and the output characteristics of the generator according to the first embodiment.

FIG. 4 is a characteristic diagram of the storage battery used in the first embodiment.

FIG. 5 is an output characteristic diagram of a drive motor used in the first embodiment.

FIG. 6 is a flowchart of power generation control according to the first embodiment.

FIG. 7 is a timing chart of the power generation control operation according to the first embodiment.

FIG. 8 is a flowchart of power generation control according to the second embodiment of the present invention.

FIG. 9 is an output characteristic diagram of the generator according to the second embodiment.

FIG. 10 is a correlation diagram between an output characteristic of an internal combustion engine and an output characteristic of a generator according to the second embodiment.

FIG. 11 is a flowchart of power generation control according to the third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drive motor 2 storage battery 3 inverter 4 reduction gear 5 a, 5 b wheel 6 internal combustion engine 7 generator 8 V belt 11 converter 12 internal combustion engine controller 13 main controller 14 rotation sensor 15 vehicle speed sensor 16 rotation sensor 17 rotation sensor 18 generator controller 20 storage battery Controller 21 Motor controller 26 Alarm device

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Eiji Inada, Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Tsuyoshi Aso, 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa, Nissan Motor Co., Ltd. 72) Inventor Yutaro Kaneko, Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Ryuichi Idoguchi Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture

Claims (9)

[Claims] An actual speed ratio between a rotation speed of an internal combustion engine and a rotation speed of a generator is calculated. If the actual speed ratio deviates from an allowable range with respect to a design speed ratio, it is determined that belt slip has occurred. A method for controlling a belt-driven generator, wherein the load on the machine is reduced by a predetermined amount to control the actual speed ratio to become the designed speed ratio. 2. The method according to claim 1, further comprising reducing a load of said generator by a predetermined amount and increasing a rotation speed of said internal combustion engine by a predetermined amount to secure a required power generation amount before a belt slip. 2. The control method of the belt-driven generator according to 1. 3. When it is determined that the belt slip has occurred, the remaining capacity of the storage battery is compared with a predetermined value. If the remaining capacity exceeds the predetermined value, the load of the generator is reduced by a predetermined amount and the actual speed is reduced. The ratio is controlled to be a set speed ratio.If the ratio does not exceed the predetermined value, the load on the generator is reduced by a predetermined amount, and the rotational speed of the internal combustion engine is increased by a predetermined amount to reduce the speed before the belt slip. 3. The control method for a belt-driven generator according to claim 2, wherein the control is performed so as to secure a required power generation amount. 4. The method according to claim 1, wherein the predetermined value of the remaining capacity of the storage battery is 50%.
The control method for a belt-driven generator according to claim 3, wherein: 5. A generator for charging a storage battery, an internal combustion engine that rotationally drives the generator via a belt, and an actual speed ratio between a rotation speed of the internal combustion engine and a rotation speed of the generator is calculated. A speed ratio calculating unit; a belt slip monitoring unit that monitors the actual speed ratio calculated by the speed ratio calculating unit, and determines that a belt slip has occurred when the actual speed ratio deviates from an allowable range with respect to a design speed ratio; When it is determined that a belt slip has occurred, a generator control means for reducing the load of the generator by a predetermined amount so as to control the actual speed ratio to the design speed ratio is provided. Control device. 6. When the belt slip monitoring means determines that a belt slip has occurred, the generator control means reduces the load on the generator and increases the rotational speed of the internal combustion engine by a predetermined amount to generate the belt slip. 6. The control device for a belt-driven generator according to claim 5, further comprising an internal combustion engine control means for securing the required power generation amount. 7. A storage battery monitoring means for monitoring the remaining capacity of the storage battery, and only the generator control means is operated when the remaining capacity monitored by the storage battery monitoring means is equal to or more than a predetermined value, and the remaining capacity is set to a predetermined value. 7. The control device for a belt-driven generator according to claim 6, further comprising: a charging method selection unit that operates the internal combustion engine control unit together with the generator control unit in the following cases. 8. A predetermined value of the remaining capacity of the storage battery is set to 50%
The control device for a belt-driven generator according to claim 7, wherein the control device is set to: 9. The control device for a belt-driven generator according to claim 5, further comprising alarm means for issuing an abnormality report when said belt slip monitoring means determines that belt slip has occurred.