JPH08164763A - Accumulating braking energy regeneration device for vehicle - Google Patents

Abstract

PURPOSE: To prevent any inadvertent car starting, accelerating and braking from occurring by imparting a braking energy regenerator operation permit command only at a time when a signal is in a forward shift position. CONSTITUTION: A control unit 60 for controlling an engine and a transmission and another control unit 61 for controlling a braking energy regeneration device both are installed there, and at a time when the engine is in revolution, and a parking brake is released, and further a signal to be outputted out of a shift switch 63 is in a forward shift position, an operating permit command is made so as to be imparted to the braking energy regeneration device. In addition, on the basis of operating conditions such as a brake and an accelerator afterward, an energy recovery mode of the braking brake energy regeneration device is executed. At the time of the engine installing, since a hydraulic motor function of a pump motor 34 is not effective, and car starting and accelerating are unable to do any longer, there is no fear of a car going to the unexpected direction, and also any inadvertent starting, accelerating and braking of the car can be prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-accumulation type braking energy regeneration device that regenerates kinetic energy during deceleration of a vehicle and uses it as drive energy for a wheel drive system, and more particularly to a technique for optimizing operation permission of the device. Regarding

[0002]

2. Description of the Related Art Conventionally, examples of this type of pressure-accumulation type braking energy regenerating device are those disclosed in Japanese Utility Model Laid-Open No. 2-121371, Japanese Patent Laid-Open No. 4-212845 and Japanese Patent Laid-Open No. 6-8806. Are known. In these devices, a pump motor is connected to a vehicle drive system via an electromagnetic clutch, and one port of this pump motor is connected to an accumulator on the high pressure side and the other port is connected to a tank on the low pressure side. . When the vehicle is decelerated, the pump motor is connected to the wheel drive system to operate as a pump to brake the wheel drive system using the pump motor as a load, and the kinetic energy of the vehicle is stored by accumulating high-pressure oil in the accumulator. to recover.

The high-pressure oil thus accumulated in the accumulator serves as an energy source for connecting a pump motor to a wheel drive system to act as a hydraulic motor, for example, at the time of starting, and is used as drive energy for the wheel drive system. .

[0004]

By the way, in such a conventional pressure-accumulation type braking energy regeneration device, the vehicle can be started and accelerated by the hydraulic motor function of the pump motor at the time of engine stalling. But at this time,
Because the power steering mechanism is not operating,
The steering wheel is heavy, which may interfere with the steering wheel operation, and the vehicle may travel in an unexpected direction.

Further, there is a possibility that careless vehicle start-up and acceleration due to the hydraulic motor function of the pump motor and careless vehicle braking due to the pump function may occur. Furthermore, at the reverse position of the transmission, the hydraulic motor of the pump motor and the oblique axis position of the hydraulic pump are switched,
To deal with this, accelerator control and brake control are complicated.

The present invention has been made in view of the above, and by the configuration that gives the operation permission of the braking energy regenerative device only under special conditions, there is a possibility that the vehicle may travel in an unexpected direction and an unintentional vehicle It is intended to prevent starting, acceleration, and braking from occurring and to simplify accelerator control and brake control.

[0007]

Therefore, according to the first aspect of the invention, when the braking device of the vehicle is operated, the pump motor is driven by the rotational force of the wheel drive system to drive the oil in the oil tank to the high pressure side accumulator. By pumping to and storing pressure,
In a pressure-accumulation type braking energy regenerating device for collecting braking energy, a control unit for controlling an engine and a transmission and a control unit for performing braking energy regeneration control are provided, and an engine rotation detecting means and a parking brake position detecting means are provided. A shift position detecting means of the transmission, the engine rotation detecting means detects that the engine is rotating, the parking brake position detecting means detects a parking brake release state, and the shift position detecting means detects a forward shift position. When detected, an operation permission command signal for the braking energy regeneration device is output from the engine / transmission control control unit to the braking energy regeneration control control unit.

[0008]

According to the first aspect of the invention, when the engine is rotating and the parking brake is released, the braking energy regenerator operation permission command is given at the forward shift position.
For example, since the energy recovery mode or the energy release mode of the braking energy regenerator is executed based on the subsequent braking or accelerator operating conditions, the hydraulic motor function of the pump motor is not performed at the time of engine stall, and the vehicle starts or accelerates. Is not possible, there is no risk of the vehicle moving in an unexpected direction, and careless starting and acceleration of the vehicle by the hydraulic motor function of the pump motor and careless braking of the vehicle by the pump function are possible. It will never happen.

Further, at the reverse position of the transmission, since the braking energy regenerative device operation permission command is not given, the accelerator control and the hydraulic motor of the pump motor and the oblique axis position of the hydraulic pump are exchanged. There is no need to complicate the brake control.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a pressure-accumulation type braking energy regeneration device for a vehicle according to the present invention. First, the configuration of the brake piping system of the vehicle will be described based on this figure.
The main brake valve 2 interlocked with the depression operation of the brake pedal 1 controls the air from the air tank 14 according to the depression amount of the brake pedal 1 or the like to supply the primary circuit 18 and the secondary circuit 19 with air. .

Similarly, the auxiliary brake valve 3, which is interlocked with the depression operation of the brake pedal 1, controls the air from the air tank 14 according to the depression amount such as the depression angle of the brake pedal 1 and supplies it to the auxiliary brake circuit 11. The auxiliary brake circuit 11 is provided with a proportional valve 9 as a pressure reducing means and a normally open solenoid valve 7.

The proportional valve 9 reduces the air pressure supplied to the auxiliary brake circuit 11 via the auxiliary brake valve 3 at a predetermined rate and supplies it to the signal pressure port of the relay valve 8 via the solenoid valve 7. The solenoid valve 7 is driven together with a braking energy regeneration device by a control unit described later based on a detection value from a brake pressure sensor 6 that detects an air pressure output to the auxiliary brake circuit 11 via the auxiliary brake valve 3. .

The relay valve 8 adjusts the air from the air tank 14 to an air pressure corresponding to the signal pressure from the proportional valve 9 and supplies the air to one port of the double check valve 4. The other port of the double check valve 4 is
It is connected to the primary circuit 18. Then, the double check valve 4 selects the higher pressure side of the air pressure on the relay valve 8 side and the air pressure on the primary circuit 18 side and supplies it to the rear wheel brake circuit 20. Although not shown, another double check valve is provided, and the high pressure side of the air pressure of the relay valve and the air pressure of the secondary circuit 19 side, which is not shown, is provided. To the front wheel brake circuit (not shown).

A rear wheel brake circuit 20 connected to the double check valve 4 drives a booster (or brake chamber) 21. The booster 21 is connected to a brake drum (not shown) to form a service brake device for braking the wheels. Next, the configuration of the braking energy regeneration system will be described with reference to FIG.
An oblique shaft type pump motor 34 is connected via a gear clutch 33 of a speed reducer 32 to an output shaft of a transmission 31 that shifts 0 rotation and transmits the rotation to the rear wheels.

A high pressure oil passage 37 connected to an accumulator 36 via a shutoff valve 35 is connected to one port of the pump motor 34, and a low pressure oil passage 39 connected to an oil tank 38 is connected to the other port. It An oil filter 40 and an oil cooler 41 are provided between the oil tank 38 and the shutoff valve 35, and an oil passage 42 for circulating oil via the pump motor 34 during steady running is provided. .

The accumulator 36 is provided with a pressure accumulation level sensor 43 which detects the amount of regenerated energy as the position of the piston 36a. An unexplained reference numeral 44
Is a rotation sensor, 45 is a clutch solenoid valve, 46 is a clutch switch, 47 is a servomotor, 48 is an oblique axis angle sensor, 49 is an oil temperature sensor, 50 is a shift lever, 51 is an accelerator pedal, and 52 is an indicator. .

Next, the control device of the braking energy regeneration device will be described. In FIG. 1, an engine / transmission control control unit 60 including an engine electric control unit and a transmission electric control unit, and a braking energy regeneration device control control unit 61 are provided. The accelerator position signal output from the accelerator switch 62 is input to the engine / transmission control control unit 60, and an engine torque suppression command for suppressing the engine torque from the braking energy regeneration device control control unit 61 according to the regenerative power. A rack reduction command signal for reducing the injection amount adjustment rack 64 of the injection pump as a signal is input to the engine / transmission control control unit 60.

The forward shift position signal (D, 1, 2, 3, 4) output from the shift switch 63 is used as a control unit 6 for controlling the engine and transmission.
0 is calculated and input to the braking energy regeneration device control control unit 61 as a braking energy regeneration device operation permission signal, and a forced neutral instruction signal of the transmission 31 is input from the control unit 61 to the engine / transmission control control unit 60. Is configured to be.

Further, signals from an engine rotation speed sensor 65, a vehicle speed sensor 66 and a parking brake position sensor 67 are input to the engine / transmission control control unit 60. To describe this control device in more detail, the control unit 61 for controlling the braking energy regeneration device includes, for example, a brake pressure signal from the brake pressure sensor 6 that interlocks with the brake pedal 1, a rotation signal from the rotation sensor 44, and a gear clutch 33. Position signal from the oil temperature sensor 49, the temperature signal from the oil temperature sensor 49, the oblique axis angle signal from the oblique axis angle sensor 48, and the pressure accumulation level sensor 43.
The accumulated pressure signal and the like from are respectively input.

From the control unit 61 for controlling the braking energy regenerator, for example, a brake suppression command signal is output to the solenoid valve 7, a clutch control signal is output to the clutch solenoid valve 45, and the pump motor 34 is controlled. A signal is output and a control signal is output to the shutoff valve 35.
In addition, the failure signal output from the control unit 61 for controlling the braking energy regenerative device is the indicator 5 for displaying the failure.
Entered in 2.

Next, the control content of the control unit 60 will be described with reference to FIGS. 2 and 3, and the control content of the control unit 61 will be described with reference to FIG.
FIG. 2 shows engine control by the control unit 60,
It is a flowchart of clutch control and transmission gear shift control, and in step 1 (indicated as S1 in the drawing; the same applies hereinafter), an accelerator opening signal, an engine rotation speed signal, a vehicle speed signal, and a braking energy regeneration device control control unit 61. Read various input signals such as command signals. In step 2, engine control is executed based on the read signal, and in step 3, clutch control and transmission shift control are executed. In step 4, other controls including the output to the control unit 61 for controlling the braking energy regenerator are executed.

FIG. 3 is a flow chart of the operation control of the braking energy regenerator by the control unit 60. In step 11, it is judged whether the engine speed is> 0. If the engine speed is not> 0, the process proceeds to step 12 and the braking is performed. It gives an instruction not to operate the energy regeneration device.
If the engine speed> 0, the process proceeds to step 13 to determine whether the parking brake has been released,
If the parking brake is not released, the process proceeds to step 12, and if the parking brake is released, the process proceeds to step 14 and it is determined whether or not the position of the shift switch 63 which is interlocked with the shift lever 50 is forward. If the position of the shift switch 63 is not forward, step 1
In step 2, the operation prohibition of the braking energy regeneration device is instructed as described above, and if it is in the forward direction, the process proceeds to step 15 and the operation permission of the braking energy regeneration device is instructed.

On the other hand, FIG. 4 is a flow chart showing the control contents of the braking energy regeneration device by the control unit 61. In step 21, various input signals are read, and in step 22, the operation permission command signal from the control unit 60. Is output, and if the operation permission command signal is not output, the process proceeds to step 23, the braking energy regenerative device stop mode is controlled, and the pump motor 34 is neutrally controlled.

If the driving permission command signal is output, the routine proceeds to step 24, where it is judged whether or not the brake pedal 1 is depressed. If not, the routine proceeds to step 25. If it is depressed, the routine proceeds to step 26. . Step 2
In 6, the braking energy regeneration device is controlled to the energy recovery mode, and the process proceeds to step 27 to output the compulsory neutral command to the transmission 31.

In step 25, it is judged whether or not the accelerator pedal 51 is depressed. If not depressed, the procedure returns to step 21, and if depressed, step 2
Proceed to 8. In this step 28, the braking energy regenerator is controlled to the energy release mode, and step 29
To output the rack reduction command.

In step 28, the hydraulic motor control signal of the pump motor 34 proportional to the accelerator opening signal is set to the control unit 61 for braking energy regeneration control.
The control unit 61 controls the hydraulic motor of the pump motor 34. That is, FIG. 5 shows the relationship between the oblique axis angle of the pump motor 34 on the hydraulic motor side (oblique axis angle on the hydraulic pump side at the time of energy recovery) and the accelerator opening (brake pressure at the time of energy recovery). In the present embodiment, the relationship between the oblique axis angle on the hydraulic motor side and the accelerator opening is controlled so as to change according to the pressure accumulation level (accumulation amount).

According to this structure, the control unit 60 for controlling the engine / transmission and the control unit 61 for controlling the braking energy regeneration device are provided, and the engine speed exceeds 0 (while the engine is rotating) and the parking brake is released. , Shift switch 6
When the signal output from 3 is the forward shift position, a braking energy regenerative device operation permission command is given, and the energy recovery mode or energy recovery mode of the braking energy regenerative device is based on the subsequent brake and accelerator operating conditions. So, when stalling,
Since the hydraulic motor function of the pump motor is not exhibited and it is impossible to start or accelerate the vehicle, there is no risk of the vehicle moving in an unexpected direction. The vehicle will not start or accelerate, and the pump function will not inadvertently brake the vehicle.

Further, at the reverse position of the transmission, since the braking energy regenerative device operation permission command is not given, in order to cope with the switching between the hydraulic motor of the pump motor and the oblique axis position of the hydraulic pump, the accelerator control and There is no need to complicate the brake control.

[0029]

As described above, according to the first aspect of the present invention, the control unit for controlling the engine / transmission and the control unit for controlling the braking energy regeneration device are provided, and the engine is rotating and the parking brake is released. Then, when the forward shift position is detected, the operation permission command signal of the braking energy regeneration device is changed to
Since the engine / transmission control control unit outputs the braking energy to the control unit for regenerative braking, there is a possibility that the vehicle may travel in an unexpected direction, and unintentional starting, acceleration, and braking of the vehicle may occur. It can be prevented and contributes greatly to safety.
It is possible to simplify the accelerator control and the brake control.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a pressure-accumulation type braking energy regeneration device for a vehicle according to the present invention.

FIG. 2 is a flowchart explaining the braking contents of the above embodiment.

FIG. 3 is a flowchart for explaining the braking contents of the above embodiment.

FIG. 4 is a flowchart for explaining the braking contents of the above embodiment.

FIG. 5 is a characteristic diagram showing a relationship between an oblique shaft angle on the hydraulic motor side of the pump motor (or an oblique shaft angle on the hydraulic pump side) and an accelerator opening (or a brake pressure).

[Explanation of symbols]

30 engine 31 transmission 34 pump motor 36 accumulator 38 oil tank 60 engine / transmission control control unit 61 braking energy regeneration device control control unit

Claims (1)

[Claims] 1. When operating a braking device of a vehicle, a pump motor is driven by the rotational force of a wheel drive system to pump oil in an oil tank to a high-pressure side accumulator to accumulate pressure, thereby collecting braking energy. The accumulator type braking energy regeneration device is provided with a control unit for controlling the engine and the transmission, and a control unit for performing the braking energy regeneration control. The engine rotation detection means, the parking brake position detection means, and the transmission shift position detection are provided. Means, and the engine rotation detection means detects that the engine is rotating, the parking brake position detection means detects the parking brake release state, and the shift position detection means detects the forward shift position. Energy regeneration device The operation accumulating type braking energy regenerating device for a vehicle, wherein the operation permission command signal is output from the engine / transmission controlling control unit to the braking energy regenerating controlling control unit.