JP2987739B2 - Control device for vehicle brake energy regeneration system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle brake energy regenerating system that recovers kinetic energy when the vehicle is decelerated and uses the recovered kinetic energy as driving energy, and more particularly to a control device for controlling the operation of the system.

[0002]

2. Description of the Related Art Conventionally, as this kind of brake energy regeneration system, for example, those disclosed in Japanese Utility Model Laid-Open No. 2-121371 and Japanese Patent Application Laid-Open No. 4-212845 are known. These systems are configured as shown in FIG. 6, in which a brake switch 2 that is turned on / off in response to depression of a brake pedal 1 and an output of a sensor 3 that detects the depression angle are input to a control device 4. .

A pump motor 7 is connected via an electromagnetic clutch 6 to a PTO output device 5 that uses the accumulated pressure of deceleration energy when the brake pedal 1 of the vehicle is depressed as starting and acceleration energy of the vehicle. A high-pressure accumulator 9 and a low-pressure accumulator 10 are connected to the motor 7 via a circuit valve 8. In this vehicle brake energy regenerating apparatus, the brake pedal 1
When the brake pedal is depressed, the air from the air tank 11 is supplied to the brake cylinder 12 by the output of the brake switch 2 and the sensor 3, and the brake shoe 13 contacts the brake drum 14 to apply a brake to the vehicle.

At the same time, since the electromagnetic clutch 6 is brought into contact with the output of the control device 4, the rotation of the PTO output device 5 to which the rotation of the wheels 15 is transmitted is transmitted to the pump motor 7 to rotate the same. Then, the pressure in the low-pressure accumulator 10 is increased and sent to the high-pressure accumulator 9.
When the vehicle starts or accelerates, the control device 4 controls the circuit valve 8 based on the pressure detected by the sensor 16 that detects the pressure in the high-pressure accumulator 9 so that the pressure in the high-pressure accumulator 9 is reduced. The PTO output device 5 is caused to rotate by flowing to the low-pressure side accumulator 10, but at this time, since the electromagnetic clutch 6 is in a contact state,
The wheels 15 are driven.

[0005]

When such a brake energy regenerating system is intended to be linked with an engine and a transmission, a dedicated control unit for an engine and a transmission of a conventional vehicle having no regenerative system is used. Therefore, it was necessary to develop a control unit, and the components could not be shared, which was disadvantageous in terms of cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and by using a conventional control unit for an engine and a transmission and linking a brake energy regenerating system to the engine and the transmission, a common component is used. Therefore, the purpose is to reduce costs.

[0007]

According to the present invention, when the brake device of the vehicle is operated, the pump motor is driven by the rotational force of the wheel drive system to reduce the oil in the low-pressure side accumulator to the high-pressure side. A control device for a vehicle brake energy regenerating system which recovers brake energy by pumping and accumulating pressure to an accumulator, comprising: a control unit for controlling an engine and a transmission; an accelerator position detecting means; and a shift lever position of the transmission. An interface circuit for signal conversion is interposed between the detection means and the control circuit of the brake energy regeneration system is connected to the interface circuit, and an accelerator position signal output from the accelerator position detection means is transmitted to the interface circuit. Brake through Input to the control unit of the lugi regenerative system, from the control unit via the interface circuit to the control unit that controls the engine and the transmission as a pseudo accelerator position signal as an engine torque suppression command signal that suppresses the engine torque according to the regenerative power and inputs, to the input as a regenerative system operation permission signal to the control unit of the brake energy recovery system forward shift position signal outputted from the shift lever position detecting means through the interface circuit, during regenerative braking, the control was configured to input a forced neutral instruction signal of the transmission from the unit via an interface circuit to a control unit for controlling the engine and transmission.

[0008]

According to the first aspect of the present invention, for example, when the shift lever position during acceleration is the forward position (D, 1, 2, 3, 4), the forward shift position signal from the shift lever position detecting means is output. It is output as a regeneration system operation permission signal to the regeneration system control unit via the interface circuit . An accelerator position signal output from the accelerator position detecting means when the its is outputted to the regeneration system control unit via an interface circuit. Then, an engine torque suppression command signal for suppressing the engine torque in accordance with the regenerative power is output from the regenerative system control unit to the engine / transmission control unit via the interface circuit as a pseudo accelerator position signal. During regenerative braking, the regenerative brake
Forced neutral indication signal from stem control unit
Engine / Transmission via interface circuit
Output to the application control unit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram schematically showing a control system in a brake energy regeneration system for a vehicle according to the present invention. In this figure, an engine / transmission control unit 22 comprising an engine power control unit 20 and a transmission power control unit 21, an accelerator switch 23 as accelerator position detecting means, and a shift switch 24 as transmission shift lever position detecting means. interface circuit 2 for signal conversion between
The interface circuit 25 is connected to the control unit 26 of the brake energy regeneration system.

The accelerator position signal output from the accelerator switch 23 is input to the brake energy regeneration system control unit 26 via the interface circuit 25, and the control unit 2
From 6, an engine torque suppression command signal for suppressing the engine torque according to the regenerative power is input to the engine / transmission control unit 22 via the interface circuit 25 as a pseudo accelerator position signal.

A forward shift position signal (D, 1, 2, 3, 4) output from the shift switch 24 is transmitted to a brake energy regeneration system control unit 26 via the interface circuit 25 as a regeneration system operation permission signal. is inputted, during regenerative braking, configured forced neutral instruction signal transmission from the control unit 26 is inputted via the interface circuit 25 to the engine / transmission control unit 22.

The control system shown in FIG. 1 will be described in further detail. The regenerative system control unit 26 includes a brake pressure signal from a brake pressure sensor 27 linked to a brake pedal, a rotation signal from the PTO output device 5, and a signal from the electromagnetic clutch 6. , The temperature signal from the pump motor 7, the oblique axis angle (displacement volume) signal from the pump motor 7, and the accumulated pressure signal from the high-pressure accumulator 9.

The regenerative system control unit 2
From 6, a brake suppression command signal is output to the brake control valve 29, a clutch control signal is output to the electromagnetic clutch 6, a control signal is output to the pump motor 7, and a control signal is output to the shutoff valve 30. Note that a failure signal output from the regenerative system control unit 23 is input to a lamp 33 indicating a failure.

FIG. 2 shows the interface circuit 25.
Of a wiring diagram, the harness 31 of the engine / transmission control unit that the accelerator switch and the shift switch is connected is connected to the interface circuit 25 through the harness 32 and output connector C ₁ for the accelerator switch, shift position signal from the harness 31, R of the interface circuit 25 via the input-output connector C _2, N, D, is connected to each terminal of 4,3,2,1.

The power supply terminal + V for the accelerator sensor of the engine / transmission control unit 22, the accelerator command signal terminal SIG. And the terminal GND are the power supply terminal for the accelerator sensor of the interface circuit 25, respectively.
V, accelerator command signal terminal SIG. And terminal A-GND
It is connected via the input-output connector B ₁ in. Also, R in the shift position of the engine / transmission control unit 22, N, D, the respective terminals of 4,3,2,1, connected by via the input and output connectors B ₂ similar terminal of each interface circuit 25 .

On the other hand, three types of engine torque suppression command signal terminals RDB of the regenerative system control unit 26 are provided.
The RDC RDDs are connected to similar terminals of the interface circuit 25 via the input / output connector A1.
The regenerative system operation permission signal SVAX of the regenerative system control unit 26
5 are connected via an input / output connector A2. Further, a forced neutral indication signal terminal RVAX of the regenerative system control unit 26 is connected to a similar terminal of the interface circuit 25 via an input / output connector A2.

Also, the regeneration system control unit 2
6 accelerator command signal terminal AG SIG. And terminal CG
ND is connected via the input-output connector A ₃ similar terminals of the interface circuit 25. The brake pressure signal from the brake pressure sensor 27 is input to a terminal AB of the regenerative system control unit 26.

FIG. 3 shows the structure of an interface box 25A in which the interface circuit 25 is housed. The interface box 25A is formed in a rectangular shape. The output connector A to one side end portion of the interface box _{25A (A 1 ~A 3),} B
(B ₁ , B ₂ ) are provided above and below, and the input / output connector C (C ₁ , C ₂ ) is provided at the bottom.

In such a configuration, when the shift lever position at the time of acceleration is the forward position (D, 1, 2, 3, 4), the forward shift position signal from the shift switch 24 is supplied to the regenerative system control via the interface circuit 25. It is output to the unit 26 as a regeneration system operation permission signal SVAX. On the other hand, the accelerator position signal AG output from the accelerator switch 23 at that time is supplied to the regeneration system control unit 2 via the interface circuit 25.
6 is output. Then, an engine torque suppression command signal for suppressing the engine torque according to the regenerative power is output from the regeneration system control unit 26 to the engine / transmission control unit 22 via the interface circuit 25 as a pseudo accelerator position signal. During regenerative braking, the regenerative system control
When the forced neutral instruction signal RVAX is
Engine / transmission via base circuit 25
Output to the control unit 22, the engine and wheels
Is disconnected, and the vehicle's running energy is regenerated.
Stored in the system .

FIGS. 4A, 4B and 4C show the relationship between the accumulated pressure of the high-pressure accumulator 9 during acceleration, the vehicle speed, and the pseudo accelerator position (accelerator opening). This pseudo accelerator position (accelerator opening) is, for example, RDD, RD
C and RDB are set so as to increase as the accumulated pressure decreases in a stepwise manner. Note that, as shown in FIG. 5, the pseudo accelerator position (accelerator opening) may be set so as to gradually increase as the accumulated pressure decreases.

According to this configuration, the control device for the vehicle brake energy regeneration system is provided with an interface circuit 25 for signal conversion between the engine / transmission control unit 22, the accelerator switch 23 and the shift switch 24, The interface circuit 25 is connected to the brake energy regeneration system control unit 26, and the accelerator position signal output from the accelerator switch 23 is transmitted to the interface circuit 25.
And an interface circuit for the engine / transmission control unit 22 as a pseudo-accelerator position signal from the control unit 26 as a pseudo-accelerator position signal from the control unit 26 for suppressing the engine torque according to the regenerative power. with a configuration of inputting via the 25 inputs as a regenerative system operation permission signal to the brake energy recovery system control unit 26 the forward shift position signal outputted from the shift switch 24 via the interface circuit 25, during regenerative braking Is
Because was configured to the <br/> forced neutral instruction signal transmission from the control unit 26 inputs via the interface circuit 25 to the engine / transmission control unit 22, and the braking energy regeneration system attempts to conjunction with engine and transmission In this case, the existing control unit 22 for the engine / transmission can be diverted, and there is no need to develop a dedicated control unit separate from the control unit for the engine and the transmission of the conventional vehicle without a regenerative system. And cost can be reduced.

[0022]

As described above, according to the first aspect of the present invention, when the brake energy regeneration system is linked to the engine and the transmission, the existing control unit for the engine / transmission is used. In addition, there is no need to develop a dedicated control unit separate from the control unit for the engine and the transmission of the conventional vehicle without the regenerative system, so that the parts can be shared and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an embodiment of a control device for a vehicle brake energy regeneration system according to the present invention.

FIG. 2 is a wiring diagram of an interface circuit.

FIGS. 3A and 3B are diagrams showing a structure of an interface box in which an interface circuit is housed, wherein FIG.
(B) is a side view, (C) is a bottom view

FIG. 4 is a characteristic diagram showing a relationship between a pressure accumulation amount of a high-pressure side accumulator during acceleration, a vehicle speed, and a pseudo accelerator position (accelerator opening).

FIG. 5 is a characteristic diagram showing a pseudo accelerator position (accelerator opening).

FIG. 6 is a block diagram of a vehicle brake energy regenerating device.

[Explanation of symbols]

22 engine / transmission control unit 23 accelerator switch 24 shift switch 25 interface circuit 26 brake energy regeneration system control unit

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-56008 (JP, A) JP-A-3-42721 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60K 25/00 B60T 1/10 B60T 10/04

Claims (1)

(57) [Claims] When a brake device of a vehicle is operated, a pump motor is driven by the rotational force of a wheel drive system to pump oil in a low-pressure accumulator to a high-pressure accumulator to accumulate pressure, thereby recovering brake energy. A control unit for controlling an engine and a transmission, and an interface circuit for signal conversion interposed between an accelerator position detecting means and a shift lever position detecting means of the transmission. Connecting the interface circuit to a control unit of the brake energy regenerating system, and inputting an accelerator position signal output from the accelerator position detecting means to a control unit of the brake energy regenerating system via the interface circuit. An engine torque suppression command signal for suppressing engine torque according to regenerative power from the control unit is input as a pseudo accelerator position signal to a control unit for controlling the engine and the transmission via an interface circuit, and the shift lever position detecting means is provided. the forward shift position signal output from through the interface circuit input as a regenerative system operation permission signal to the control unit of the braking energy recovery system, during regenerative braking, the forced neutral instruction signal transmission from the control unit A control device for a vehicle brake energy regenerating system, wherein the control unit controls the engine and the transmission by inputting the control unit via an interface circuit.