JP3621448B2 - Accumulated braking energy regeneration device for vehicle - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pressure-accumulation braking energy regeneration device that regenerates kinetic energy during deceleration of a vehicle and uses it as driving energy for a wheel drive system, and more particularly to a technique for increasing the amount of regenerative energy.
[0002]
[Prior art]
Conventionally, as this type of accumulator braking energy regeneration device, for example, those disclosed in Japanese Utility Model Laid-Open No. 2-121371, Japanese Patent Laid-Open No. 4-212845, Japanese Patent Laid-Open No. 6-8806, and the like are known.
In these devices, a pump motor is connected to a vehicle drive system via an electromagnetic clutch, and one port of the pump motor is connected to a high-pressure side accumulator and the other port is connected to a low-pressure side tank. . When the vehicle decelerates, the pump motor is connected to the wheel drive system and operated as a pump, thereby braking the wheel drive system with the pump motor as a load and accumulating high-pressure oil in the accumulator to reduce the kinetic energy of the vehicle. to recover.
[0003]
The high-pressure oil accumulated in the accumulator in this way serves as an energy source that acts as a hydraulic motor by connecting the pump motor to the wheel drive system, for example, when starting, and is used as drive energy for the wheel drive system.
[0004]
[Problems to be solved by the invention]
By the way, in such a conventional accumulator braking energy regeneration device, when the engine brake acts during regenerative braking in which the operation permission command signal of the regeneration device and the signal for detecting the operation of the braking device of the vehicle are output, There is a problem that the accumulated amount of high-pressure oil in the accumulator is reduced and the amount of kinetic energy recovered from the vehicle is reduced.
[0005]
In this case, in order to avoid the above problems, it is necessary to depress the clutch pedal during braking to prevent the engine brake from acting, and it is necessary to depress the clutch pedal. The nature is bad.
The present invention has been made in view of the above, and by executing control for forcibly neutralizing the transmission during regenerative braking, the recovery amount of the kinetic energy of the vehicle is increased and the operability is also improved. For the purpose.
[0006]
[Means for Solving the Problems]
Therefore, according to the first aspect of the present invention, during operation of the braking device of the vehicle, the slant shaft type pump motor is driven by the rotational force of the wheel drive system, and the oil in the oil tank is pumped to the high pressure side accumulator and accumulated. In the accumulator braking energy regenerative device adapted to recover the braking energy,
A first control unit for controlling the engine and transmission;
A second control unit for performing braking energy regeneration control;
Provided,
The first control unit outputs an operation permission command signal of the braking energy regeneration device when the engine speed is greater than 0, the parking brake is released, and the shift lever is operated to the forward position . Output to the control unit ,
The second control unit controls the braking energy regeneration device to the braking energy recovery mode and the forced neutralization of the transmission when the operation permission command signal is input and the operation of the braking device of the vehicle is performed. The instruction signal is output to the first control unit .
According to a second aspect of the present invention, when the second control unit controls the braking energy regeneration device to a braking energy recovery mode, the pump motor is based on an oil pressure accumulation amount and a brake pedal operation amount in the accumulator. The oblique axis angle is controlled.
[0007]
[Action]
In the first aspect of the invention, for example, a forced neutral instruction signal of the transmission controls the engine and the transmission during regenerative braking such as when a braking energy regeneration device operation permission command is issued and the brake pedal is depressed . Is output to the control unit . Therefore, the engine brake does not act during regenerative braking, the pressure accumulation of high-pressure oil in the accumulator increases, and the amount of kinetic energy recovered from the vehicle can be increased.
In the invention according to claim 2, the oblique axis angle of the pump motor is controlled based on the oil pressure accumulation amount and the brake pedal operation amount in the high-pressure accumulator.
[0008]
【Example】
Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of an accumulator braking energy regeneration device for a vehicle according to the present invention.
First, based on this figure, the configuration of the brake piping system of the vehicle will be described. The main brake valve 2 interlocked with the depression operation of the brake pedal 1 is moved from the air tank 14 according to the depression amount such as the depression angle of the brake pedal 1. The air is supplied to the primary circuit 18 and the secondary circuit 19 respectively.
[0009]
Similarly, the auxiliary brake valve 3 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 and a normally open electromagnetic valve 7 as pressure reducing means.
[0010]
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 electromagnetic valve 7.
The electromagnetic valve 7 is driven together with a braking energy regeneration device by a control unit, which will be 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. .
[0011]
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 it to one port of the double check valve 4.
The other port of the double check valve 4 is connected to the primary circuit 18. The double check valve 4 selects the high 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. In addition, although not shown, another double check valve is provided, and the high pressure side is selected from the air pressure of the relay valve and the secondary circuit 19 side, which is also not shown. To a front wheel brake circuit (not shown).
[0012]
The 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) and constitutes a service brake device that applies braking to the wheels.
Next, the configuration of the braking energy regeneration system will be described with reference to FIG. 1. The output shaft of the transmission 31 that changes the rotation of the engine 30 and transmits it to the rear wheels is connected to the oblique shaft via the gear clutch 33 of the speed reducer 32. A pump motor 34 of the type is connected.
[0013]
A high pressure oil passage 37 connected to an accumulator 36 is connected to one port of the pump motor 34 via a cutoff valve 35, and a low pressure oil passage 39 connected to an oil tank 38 is connected to the other port. An oil filter 40 and an oil cooler 41 are interposed between the oil tank 38 and the cutoff valve 35, and an oil passage 42 is provided for circulating oil through the pump motor 34 during steady running. .
[0014]
The accumulator 36 is provided with a pressure accumulation level sensor 43 that detects the amount of energy regenerated as the position of the piston 36a.
Reference numeral 44 is a rotation sensor, 45 is a solenoid valve for clutch, 46 is a clutch switch, 47 is a servo motor, 48 is an oblique angle sensor, 49 is an oil temperature sensor, 50 is a shift lever, 51 is an accelerator pedal, 52 is a display.
[0015]
Next, a control device for such a braking energy regeneration device will be described.
In FIG. 1, an engine / transmission control unit 60 (first control unit) composed of an engine electric control unit and a transmission electric control unit , a braking energy regeneration device control control unit 61 (second control unit) , Is provided.
The accelerator position signal output from the accelerator switch 62 is input to the control unit 60, and an injection amount adjustment rack 64 of the injection pump serving as an engine torque suppression command signal for controlling the engine torque according to the regenerative power from the control unit 61. A rack reduction command signal to be reduced is input to the engine / transmission control control unit 60.
[0016]
Further, the forward shift position signal (D, 1, 2, 3, 4) output from the shift switch 63 is calculated by the control unit 60 and used as a braking energy regeneration device operation permission signal to the control unit 61 for controlling the braking energy regeneration device. The control unit 61 is configured to input a forced neutral instruction signal of the transmission 31 to the engine / transmission control control unit 60.
[0017]
Further, a signal from the vehicle speed sensor 66 is input to the engine / transmission control control unit 60.
More specifically, the control unit 61 for controlling the braking energy regeneration device includes, for example, a brake pressure signal from the brake pressure sensor 6 interlocked with the brake pedal 1, a rotation signal from the rotation sensor 44, and the gear clutch 33. Clutch position signal, temperature signal from the oil temperature sensor 49, oblique axis angle signal from the oblique axis angle sensor 48, accumulated pressure signal from the accumulated pressure level sensor 43, and the like.
[0018]
Also, from the control unit 61 for controlling the braking energy regeneration device, for example, a brake suppression command signal is output to the electromagnetic valve 7, a clutch control signal is output to the clutch electromagnetic valve 45, and a control signal is output to the pump motor 34. Then, a control signal is output to the cutoff valve 35.
The failure signal output from the control unit 61 for controlling the braking energy regeneration device is input to the display 52 that displays the failure.
[0019]
Next, the control content by the control unit 60 will be described with reference to FIGS. 2 and 3, and the control content by the control unit 61 will be described with reference to FIG.
FIG. 2 is a flowchart of engine control, clutch control, and transmission shift control by the control unit 60. In step 1 (denoted as S1 in the figure, the same applies hereinafter), an accelerator opening signal, an engine speed signal, a vehicle speed signal, braking Various input signals such as a command signal from the control unit 61 for controlling the energy regeneration device are read. 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 an output to the control unit 61 for controlling the braking energy regeneration device are executed.
[0020]
FIG. 3 is a flowchart of the operation control of the braking energy regeneration device by the control unit 60. In step 11, the engine rotational speed> 0 is determined. If the engine rotational speed> 0 is not satisfied, the process proceeds to step 12 and the braking energy regeneration device. The operation is not permitted. If the engine speed is greater than 0, the process proceeds to step 13 to determine whether or not the parking brake is released. If the parking brake is not released, the process proceeds to step 12, and if the parking brake is released, the step 14, it is determined whether or not the position of the shift switch 63 interlocked with the shift lever 50 is forward. If the position of the shift switch 63 is not forward, the process proceeds to step 12 to command the disapproval of the braking energy regeneration device as described above. If forward, the process proceeds to step 15 to operate the braking energy regeneration device. Command permission.
[0021]
On the other hand, FIG. 4 is a flowchart showing the control contents of the braking energy regeneration device by the control unit 61. In step 21, various input signals are read. In step 22, an operation permission command signal is output from the control unit 60. If the operation permission command signal is not output, the process proceeds to step 23 to control to the braking energy regeneration device stop mode to control the pump motor 34 to be neutral.
[0022]
If the operation permission command signal is output, the process proceeds to step 24 to determine whether or not the brake pedal 1 has been depressed. If not, the process proceeds to step 25. If depressed, the process proceeds to step 26.
In step 26, the braking energy regeneration device is controlled to the energy recovery mode, and the process proceeds to step 27 to output a forced neutral command for the transmission 31 to the control unit 60.
[0023]
In step 25, it is determined whether or not the accelerator pedal 51 is depressed. If not, the process returns to step 21, and if it is depressed, the process proceeds to step 28.
In step 28, the braking energy regeneration device is controlled to the energy release mode, and the process proceeds to step 29 to output a rack reduction command.
[0024]
In step 28, a hydraulic motor control signal of the pump motor 34 proportional to the accelerator opening signal is output to the braking energy regeneration control control unit 61, and the hydraulic motor of the pump motor 34 is controlled by the control unit 61.
That is, FIG. 5 shows the relationship between the oblique angle on the hydraulic motor side of the pump motor 34 (the oblique axis angle on the hydraulic pump side when energy is recovered) and the accelerator opening (the brake pressure when energy is recovered). In the present embodiment, the relationship between the oblique angle on the hydraulic motor side and the accelerator opening is controlled so as to change according to the pressure accumulation level (pressure accumulation amount).
[0025]
According to this configuration, the engine / transmission control unit 60 and the braking energy regenerator control unit 61 are provided. For example, the engine speed exceeds 0 and the signal output from the shift switch 63 is the forward shift position. During regenerative braking in which a brake energy regenerative device operation permission command is issued and the brake petal 1 is depressed, a forced neutral instruction signal for the transmission 31 is transmitted from the control unit 61 for controlling the brake energy regenerative device to the control unit for engine / transmission control. Since it is configured to output to 60, the engine brake does not act during regenerative braking, the pressure accumulation of the high-pressure oil in the accumulator 36 increases, and the amount of kinetic energy recovered from the vehicle can be increased.
[0026]
Further, it is not necessary to depress the clutch pedal during braking to prevent the engine brake from acting, and it is not necessary to depress the clutch pedal.
[0027]
【The invention's effect】
As described above , according to the present invention, the first control unit for controlling the engine and the transmission and the second control unit for performing the braking energy regeneration control are provided, and the braking energy regeneration device operation permission command is made. during regenerative braking operation of the braking system of a vehicle is being performed, because configured to output the second control unit to force the neutral instruction signal of the transmission to the first control unit, an engine brake during regenerative braking action In addition, the accumulation of high-pressure oil in the accumulator increases, and the amount of kinetic energy recovered from the vehicle can be increased. In addition, it is not necessary to depress the clutch pedal during braking, and the operability is excellent.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of an accumulator braking energy regeneration device for a vehicle according to the present invention. FIG. 2 is a flowchart for explaining braking contents of the embodiment. FIG. 3 is for explaining braking contents of the embodiment. FIG. 4 is a flow chart for explaining the braking contents of the embodiment. FIG. 5 is an oblique axis angle (or an oblique axis angle on the hydraulic pump side) of the pump motor and an accelerator opening (or a brake pressure). ) Characteristic diagram showing the relationship with
30 Engine 31 Transmission 34 Pump motor 36 Accumulator 38 Oil tank 60 Control unit 61 for controlling engine / transmission 61 Control unit for controlling braking energy regeneration device

Claims (2)

Accumulation of pressure to recover braking energy by driving a slanted shaft type pump motor by the rotational force of the wheel drive system and pumping and accumulating oil in the oil tank to the high-pressure side accumulator when the vehicle braking device is operated Type braking energy regeneration device,
A first control unit for controlling the engine and transmission;
A second control unit for performing braking energy regeneration control;
Provided,
The first control unit outputs an operation permission command signal of the braking energy regeneration device when the engine speed is greater than 0, the parking brake is released, and the shift lever is operated to the forward position . Output to the control unit ,
The second control unit controls the braking energy regeneration device to the braking energy recovery mode and the forced neutralization of the transmission when the operation permission command signal is input and the operation of the braking device of the vehicle is performed. A pressure accumulation type braking energy regeneration device for a vehicle, characterized in that an instruction signal is outputted to a first control unit . The second control unit controls an oblique axis angle of the pump motor based on an oil pressure accumulation amount and a brake pedal operation amount in the accumulator when the braking energy regeneration device is controlled to a braking energy recovery mode. The accumulator braking energy regeneration device for a vehicle according to claim 1.

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