JPH0424156A - Electric braking & auxiliary acceleration device for automobile - Google Patents

Abstract

PURPOSE:To prevent a slip at the time of braking on the low mu surface of a road by connecting a cage rotor type induction motor to the main shaft of an internal combustion engine, controlling an amount of slip of rotatory magnetic field which this induction motor gives the magnetic field, actuating the induction motor as a generator, so as to give a control force to wheels. CONSTITUTION:In the case where a braking force is generated in a rotation system as an electric braking device, such a control signal as giving a rotational magnetic field in a velocity smaller than the rotational speed of the rotator of the cage rotor type inductor motor 2 detected by a rotary sensor 5 to the stationary part of the motor 2 through a control measure 6 when the electric braking motion is indicated by a lever 13. Thus, the motor 2 is actuated as a generator. Also, when a direct current terminal voltage is raised beyond a preset value because a brake torque is big and a direct current power supply 3 is unable to absorb this direct current energy, this value is detected by a voltage detecting circuit 10, and a switch circuit 9 is controlled by a switch control circuit 11 to connect a resistor 8 to the terminal of the direct current power supply 3. Thus, it is so arranged as to give a braking force by converting electric energy into thermo-energy.

Description

[Detailed description of the invention] [Industrial application field] INDUSTRIAL APPLICATION This invention is utilized for the control of the electric brake of a motor vehicle.

The present invention relates to a device that detects the rotational speed of a wheel during electrical braking and controls braking force.

〔overview〕

The present invention is an electric braking and auxiliary acceleration system for automobiles that operates a squirrel cage induction machine directly connected to the main shaft of an internal combustion engine as a generator, regenerates the generated energy, and converts it into thermal energy to obtain braking force. By prohibiting electric braking when the wheel rotation speed is below a predetermined value or when the wheel rotation speed is negative, electric braking can be applied on roads where the coefficient of friction between the tires and the road surface is small, such as on ice slopes. This prevents the tires from slipping when the brakes are applied, increasing the stability of vehicle behavior and the effectiveness of the brakes.

[Conventional technology]

The applicant has proposed a retarder device as shown in FIG.
278), Japanese Unexamined Patent Publication No. 63-206103 (Patent Application No. 62-
36279), Japanese Unexamined Patent Publication No. 63-265527 (Patent Application No. 63-265527)
2-36280) and Japanese Patent Application Laid-Open No. 63-206101 (Japanese Patent Application No. 62-36281).

This device (i) includes a squirrel-cage induction machine 2 directly connected to the internal combustion engine 1, a DC power supply 3, and a DC voltage of the DC power supply 3 that induces a rotating magnetic field with a rotation speed lower than the shaft rotation speed of the squirrel-cage induction machine 2. An inverter device 4 that converts the alternating current voltage into an alternating current voltage with a frequency compatible with the frequency and applies it to the squirrel cage induction machine 2, and converts the alternating current power from the squirrel cage induction machine 2 into direct current power, and the frequency of the alternating current voltage of the inverter device 4. and a control means 6 for setting.

Further, a rotation sensor 5 is attached to the squirrel cage induction machine 2,
A signal from this rotation sensor 5 is given to control means 6. Further, a resistor 8 is connected to the output of the inverter device 4 via a capacitor 7 and a switch circuit 9.

The operation of the retarder device configured in this way is that the squirrel cage induction motor 2 is directly connected to the main shaft of the internal combustion engine 1 mounted on the automobile.
The rotor section of is driven to rotate. When the mechanical energy of the rotating system is absorbed to brake the running of the vehicle, the inverter device 4 applies a rotating magnetic field to the stator winding of the squirrel cage induction machine 2 at a rotation speed lower than the rotation speed of the rotor section.

That is, alternating current is applied from the DC power supply 3 to the stator winding of the squirrel cage induction machine 2 via the inverter device 4, thereby converting the mechanical energy of the rotating system into electrical energy, and this electrical energy is transferred to the DC power supply. 3 is regeneratively charged.

Further, the control means 6 includes a device for controlling the degree of braking in the inverter device 4 according to the driving of the automobile, and when temporarily generating a large brake torque as the automobile is driving, the control means 6 generates the braking torque from the squirrel cage induction machine 2. Since it is difficult to regenerate all the electrical energy to the DC power supply 3,
The thermal energy is dissipated by the resistor 8 via the switch circuit 9 to obtain a large brake torque.

The conventional retarder device described above is capable of detecting a change in wheel rotational speed that occurs during electrical braking, that is, when the wheel rotational speed falls below a predetermined value or changes to a negative speed due to braking. could not.

[Problem to be solved by the invention]

As mentioned above, conventional retarder devices cannot detect the rotational speed of the wheels caused by braking and control the braking force. There was a problem in that when braking force was applied, slippage occurred and the vehicle became unstable.

The present invention solves this problem by controlling the braking state according to the rotational speed of the wheels when electric braking force is applied, increasing the braking effect, and keeping the vehicle in a stable state. The purpose is to provide equipment.

[A means of saving to solve problems]

The present invention provides a squirrel-cage transparent conductor directly connected to the main shaft of an internal combustion engine that drives the axle of an automobile, a DC power source including a secondary battery,
An inverter device that applies a rotating magnetic field to the field of the squirrel cage induction machine by this DC power output and regenerates the electric energy generated in the field to the secondary battery, and an inverter device that inputs rotation information of the main shaft and In an electric braking and auxiliary acceleration device for a motor vehicle, the electric braking and auxiliary acceleration system for a motor vehicle is provided with a control means for controlling the slip amount of a rotating magnetic field applied to a magnet, a wheel rotation sensor detecting rotation of a wheel of the motor vehicle and providing the rotation to the control means, the control means , the control is in the state of electric braking, and according to the output from this wheel rotation sensor, electric braking is prohibited when the wheel rotation speed is less than a predetermined value or the wheel rotation speed is negative, and the wheel speed is set to the specified value. A feature characterized in that it includes means for returning to the electric braking state after the value has been restored.
Effect] A rotating magnetic field is applied to the field of the squirrel cage induction machine directly connected to the main shaft of the internal combustion engine that drives the axle by DC power output, and the amount of slip of this rotating magnetic field is controlled to control the rotation speed of the rotor. The squirrel cage induction machine operates as a generator to provide braking force to the wheels.

When the braking force is increased, the rotational speed of the rotating magnetic field may become negative, so the rotational speed of the wheel is detected, and according to the detection output, when the rotational speed of the wheel falls below a predetermined value, or when the wheel rotational speed is When a negative state is reached, it is assumed that the wheels are slipping and spinning, and electrical braking is prohibited, and after the wheel speed has recovered to the specified value, the electrical braking state is restored.

This prevents slippage during braking that occurs on roads where the coefficient of friction between the wheels and the road surface is small, allowing the vehicle to run in a stable state.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a view taken along arrow A in FIG.

The embodiment of the present invention includes a squirrel-cage induction machine 2 directly connected to the main shaft of an internal combustion engine 1 that drives an axle of an automobile, a DC power supply 3 including a secondary battery, and an output of the DC power supply 3 to generate a squirrel-cage induction machine 2. an inverter device 4 that applies a rotating magnetic field to the magnetic field and regenerates the electric energy generated in the field to the DC power supply 3; a rotation sensor 5 that detects the rotation speed of the main shaft; and rotation information detected by the rotation sensor 5. is input to the control means 6 which controls the amount of rotational magnetic field slip applied to the field, the capacitor 7 connected to the output of the inverter device 4, and the field winding of the squirrel cage induction machine 2 via the inverter device 4. A resistor 8 to which the generated current is supplied, a switch circuit 9 connected between the resistor 8 and the inverter device 4 to open and close the circuit, and a voltage applied to the resistor 8 from the inverter device 4 are detected. and a switch control circuit 11 that controls the effective value of the resistor 8 to a larger value as the detection output of the voltage detection circuit 10 becomes larger.
and a lever 13 that is provided near the steering wheel 12 and gives instructions for operating and stopping the inverter device 4.
, a transmission position W sensor 15 that detects the shift position of the reduction gear of the transmission 14, and a wheel 1.
Toothed wheel 1 integrated with the brake drum provided in 6
and a wheel rotation sensor 18 disposed opposite to the wheel rotation sensor 160 for detecting the rotation speed of the wheel 160. is below a predetermined value or the wheel rotational speed is negative, the electric braking is prohibited, and the electric braking state is restored after the wheel speed has recovered to the specified value.

Next, the operation of the embodiment of the present invention configured as described above will be explained.

The operation of applying driving force to the rotating system as an auxiliary accelerator is performed. In this case, the control means 6 generates a rotating magnetic field at a speed higher than the rotational speed of the rotor section of the squirrel cage induction machine 20 detected by the rotation sensor 5. A control signal is generated to be applied to the stator section of the squirrel cage induction machine 2.

At this time, DC current is taken out from the DC power supply 3,
The inverter device 4 converts the rotating magnetic field into a multiphase alternating current that corresponds to the rotating magnetic field, and supplies it to the squirrel cage induction machine 2 . The greater the difference between the rotational speed of the rotating magnetic field and the shaft rotational speed, the greater the driving force is applied.

Charging of the DC power supply 3 is performed by supplying a control signal from the control means 6 to the inverter device 4 for applying a rotating magnetic field to the stator of the squirrel cage induction machine 2 corresponding to the rotation of the rotor. .

Further, as an electric braking device, an operation is performed to generate a braking force in the rotating system. In this case, when an electric braking operation is instructed by the lever 13, the control means 6 controls the squirrel cage induction motor detected by the rotation sensor 5. A control signal is generated to apply a rotating magnetic field at a speed lower than the rotational speed of the rotor section of the squirrel cage induction machine 2 to the stator section of the squirrel cage induction machine 2.

At this time, the squirrel cage induction machine 2 operates as a generator, and the generated electrical energy is converted into DC energy by the inverter device 4 and supplied to the DC power source 3 as a charging current. When the brake torque is large and the DC power supply 3 cannot absorb this DC energy, the DC terminal voltage rises beyond a predetermined value, this value is detected by the voltage detection circuit IO, and the switch control circuit 11 is detected by this detection output. controls the switch circuit 9 to close the resistor 8 to the terminal of the DC power supply 3. As a result, the electrical energy is converted into thermal energy by the resistor 8 and released into the atmosphere, providing braking force to the rotating system.

When a large electrical braking force is applied in this way,
If the coefficient of friction between the wheels and the road surface is small, the wheels stop rotating or reverse, resulting in unstable running conditions. The feature of the present invention is that the rotational speed of the wheels is detected, and if the braking force is large, the braking state is released, thereby performing braking in accordance with the road surface condition.

FIG. 3 is a flowchart showing the flow of operation of the embodiment of the present invention.

Lever 1 provided near the steering wheel 12
When electric braking is instructed by 3, the transmission position sensor 15 captures the shift position of the reduction gear, and the rotation sensor 5 captures the rotational speed v1 of the internal combustion engine 1.

Based on the captured position of the reduction gear and the rotational speed v1 of the internal combustion engine 1, the amount of slip applied to the field of the squirrel cage induction machine 2 is calculated and sent to the control means 6.

The control means 6 controls the inverter device 4 according to the calculated slip amount, and the squirrel cage induction machine 2 applies electric braking by this control.

In this way, when electric braking is applied, the wheels 16
A toothed wheel 17 integrated with a brake drum provided in
Wheel rotation sensor I8 arranged opposite to wheel 1
The rotation speed v2 of the wheel 16 is taken in, and the rotation speed is determined based on the relationship between the rotation speed v2 of the wheel 16, the shift position of the reduction gear and the rotation speed of the internal combustion engine 1 when electric braking is performed on a dry road. A comparison is made with a specified standard value α.

As a result of the comparison, if the captured rotational speed v2 is equal to or greater than the specified value α, it is determined that the electric braking is insufficient and control is continued; if it is smaller or equal, it is determined that the electric braking is being applied too much. Prohibit electric braking.

〔Effect of the invention〕

As explained above, according to the present invention, by controlling the braking state in accordance with the rotational speed of the wheels when electric braking force is applied, overbraking occurs on roads where the coefficient of friction between the wheels and the road surface is small. This has the effect of preventing slippage during excitation and allowing the vehicle to run in a stable state.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a view of the embodiment of the present invention viewed from arrow A on the right side of FIG. 1. FIG. 3 is a flowchart showing the operation flow of the embodiment of the present invention. FIG. 4 is a block diagram showing the configuration of a conventional example. DESCRIPTION OF SYMBOLS 1... Internal combustion engine, 2... Squirrel cage induction machine, 3... DC power supply, 4... Inverter device, 5... Rotation sensor, 6... Control means, 7... Capacitor, 8...Resistor, 9...Switch circuit, 10...Voltage detection circuit, 11...Switch control circuit, 12...Steering wheel, 13...Lever↓4...Transmission, 15 ...Transmission position sensor, 1
6...Wheel, 17...Toothed whinope 18...Wheel rotation sensor. Patent Applicant Hino Motors Co., Ltd. Agent Patent Attorney Nao Ide Takashi Dai Shukansei ＜j fig. -p2su

Claims (1)

[Scope of Claims] 1. A squirrel-cage induction machine directly connected to the main shaft of an internal combustion engine that drives the axle of an automobile; a DC power source including a secondary battery; an inverter device that applies a rotating magnetic field to the field and regenerates electrical energy generated in the field to the secondary battery; and a control means that inputs rotation information of the main shaft and controls the amount of rotational magnetic field slip applied to the field. In the electric braking and auxiliary acceleration device for a motor vehicle, a wheel rotation sensor is provided that detects rotation of a wheel of the motor vehicle and provides the information to the control means, and the control means is in a state of electric braking, and the control means controls the rotation of the wheel. An electric braking and auxiliary acceleration device for an automobile, comprising means for inhibiting electric braking when a wheel rotational speed is below a predetermined value or when the wheel rotational speed is negative, according to an output from a sensor.