JPH074228U - Brake energy regeneration device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a brake energy regenerating device which reduces cost by using a conventional brake valve as it is. A rotary plate 34 is rotatably provided on a brake pedal 31 which is arranged with a gap from a pressing portion 17 of a brake valve 16, and the rotary plate 34 is rotated by the rotary plate 34. The pressing portion 17
A push unit 35 that presses and an actuator 37 are provided. The actuator 37 is provided with a piston portion 38 which is controlled to be in a state of being in contact with the brake pedal 31 or in a state of being free so as to project toward the brake pedal 31.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brake energy regenerator, and more particularly to a brake energy regenerator having a normal brake valve.

[0002]

[Prior art]

 As a conventional brake energy regeneration device, for example, there are those disclosed in JP-A-2-124349 and JP-A-2-141562. Further, the present applicant has applied for Japanese Patent Application No. 4-212845 as a technique related to a brake energy regeneration device.

In this type, a pump motor is connected to a wheel drive system via an electromagnetic clutch, one port of the pump motor is connected to an accumulator via a high pressure oil passage, and the other port is connected to a low pressure oil passage. Is connected to the oil tank via. During vehicle deceleration, 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 accumulate high pressure oil in the accumulator to collect deceleration energy. Is configured to.

Here, the braking torque (accumulated energy) in the regenerative device is controlled by controlling the inclination angle of the swash plate of the pump motor to control the flow rate of the pump motor. The accumulated deceleration energy is used as drive energy for the wheel drive system by connecting the pump motor to the wheel drive system to act as a motor when the vehicle starts, for example.

[0005]

[Problems to be solved by the device]

 When pressing the brake pedal to expand the brake shoe and generate braking force, operate the brake valve with the brake pedal to supply the air instruction pressure with the brake valve and generate the hydraulic pressure with the air booster. I was letting it. In addition, in such a brake energy regeneration device, since it is necessary to control the swash plate inclination angle of the pump motor based on the amount of depression of the brake pedal, it is necessary to measure the amount of depression of the brake pedal.

[0006] Here, in a braking device incorporating a conventional brake energy regeneration device, it is necessary to incorporate a function of measuring the amount of depression of a brake pedal into a brake valve used in the device, and therefore, In addition, it was necessary to replace the brake valve with a brake energy regeneration brake valve, resulting in an increase in cost.

The present invention has been made in view of the above circumstances, and it is possible to reduce the cost by using the brake valve as it is in the conventional braking device in which the conventional brake valve is incorporated. An object is to provide a brake energy regeneration device.

[0008]

[Means for Solving the Problems]

 For this reason, the present invention provides a brake pedal, an operating fluid pressure supply means for supplying an operating fluid pressure to a braking means when the pressing portion is pressed by the brake pedal, and a brake pedal. Brake energy regeneration including a depression amount detecting means for detecting the depression amount, and a brake energy regeneration means for regenerating deceleration energy during vehicle braking based on the depression amount of the brake pedal detected by the depression amount detecting means. In the device, interlocking means for interlocking the brake pedal and the pressing portion is interposed between the brake pedal and the pressing portion, and the interlocking means functions as braking means while regenerating deceleration energy at the beginning of braking. There is a control means that makes the interlocking state when operating, and the non-interlocking state when only decelerating energy is regenerated at the beginning of braking. I was kicking configuration.

[0009]

With this structure, when the deceleration energy during vehicle braking is regenerated at the beginning of braking and the braking means is operated, the interlocking means interposed between the brake pedal and the pressing portion is brought into an interlocking state. The brake pedal and the pressing portion of the operating fluid pressure supply means are integrated. As a result, when the driver depresses the brake pedal, the brake energy regeneration means regenerates deceleration energy during vehicle braking based on the depression amount of the brake pedal detected by the depression amount detecting means, and also through the interlocking means. Then, the pressing portion of the working fluid pressure supply means is stepped on, so that the working fluid pressure supply means supplies the working fluid pressure to the braking means.

Further, when only the deceleration energy is regenerated by the regenerative brake at the beginning of braking, the interlocking means interposed between the brake pedal and the pressing portion is brought into the non-interlocking state to operate the brake pedal. It should be able to move freely with respect to the pressing part of the fluid pressure supply means. As a result, when the driver depresses the brake pedal, the braking energy regeneration means regenerates deceleration energy during vehicle braking based on the depression amount of the brake pedal detected by the depression amount detecting means. Since the pressing portion of the supply means is not pressed, the working fluid pressure supply means does not supply the working fluid pressure to the braking means, and the braking by the braking means is not performed.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 showing the configuration of the first embodiment of the present invention, an output shaft of an engine body 1 is connected to wheels 6 via an engine clutch 2, a transmission 3, a propeller shaft 4 and a final reduction gear unit 5. A pump motor 8 is connected to the final reduction gear 5 via an electromagnetic clutch 7. A low pressure side accumulator 11 is connected to one port of the pump motor 8 via a low pressure oil passage 10 in which a first solenoid valve 9 is interposed, and a second solenoid valve 12 is connected to the other port. A high-pressure side accumulator 14 is connected through a mounted high-pressure oil passage 13. Further, the high pressure oil passage 13 and the low pressure oil passage 10 are configured to be connectable by the third solenoid valve 15 by bypassing the pump motor 8.

On the other hand, when the pressing portion 17 of the brake valve 16 is pressed, the brake valve 16 controls the air pressure from the air reservoir 18 in accordance with the pressing amount, etc. The pressure is supplied as an instruction pressure to the relay valve 21 of the air booster 20 via the air passage 19. Then, the relay valve 21 supplies the air having the same pressure as the indicated pressure from the air reservoir 18 to the air booster 20, generates hydraulic pressure, supplies hydraulic pressure to each wheel cylinder 23 via the hydraulic passage 22, and thus brakes. The shoe 24 is pushed open to generate braking force.

That is, the brake valve 16 functions as a fluid pressure supply means for actuation. Here, as a configuration according to the present invention, the brake pedal portion is configured as shown in FIG. A brake pedal 31, which is depressed by the driver, is rotatably provided around a rotation fulcrum 32 and is urged to a predetermined position by an urging mechanism (not shown). The brake pedal 31 is arranged with a gap from the pressing portion 17 of the brake valve 16. Further, a rotating plate 34 is provided between the brake pedal 31 and the floor surface 33 so as to freely rotate around the rotating fulcrum 32. The rotating plate 34 is in constant contact with the pressing portion 17 of the brake valve 16, has a push portion 35 that presses the pressing portion 17 as it rotates, and has an actuator 37 fixed thereto. .

The actuator 37 has a piston portion 38 projecting toward the brake pedal 31, and the supply of air pressure is controlled by the fifth solenoid valve 39 so that the piston portion 38 abuts on the brake pedal 31. The piston portion 38 is controlled to either the state or the free state. Further, the brake pedal 31 is provided with a potentiometer 25 as a depression amount detecting means for detecting the depression amount of the brake pedal 31 by the driver.

A depression amount θ of the brake pedal 31 from the potentiometer 25 is input to a control unit 26 including a microcomputer or the like. In the control unit 26, the relationship between the depression amount θ and the control current i for driving and controlling the flow rate control swash plate of the pump motor 8 is stored in a map. Then, the control current value i corresponding to the depression amount θ input from the map is retrieved, and the corresponding control current value i is output to the swash plate drive device 27 to control the tilt angle of the swash plate, and the driver's request The pump motor 8 is controlled so that the flow rate of the pump motor 8 corresponding to the applied braking torque is obtained.

Next, referring to the flow chart shown in FIG. 3, the braking energy regeneration operation by the control unit 26 of the first embodiment will be described. First, in step 1 (denoted as S1 in the figure; the same applies hereinafter), it is determined whether or not the driver has performed a brake operation (whether or not there is a brake request) based on the depression amount θ of the brake pedal 31 from the potentiometer 25. Then, when it is determined that it has been performed, the process proceeds to step 2.

In step 2, it is determined whether or not the brake energy regeneration operation is performed. This determination is made based on whether or not the braking energy can be effectively regenerated based on, for example, the vehicle speed at that time and the current pressures of the accumulators 11 and 14. If it is determined that the vehicle can be regenerated, the process proceeds to step 3. Step 3 relates to the brake energy regeneration operation determined to be performed, and whether only the brake energy regeneration operation is performed at the beginning of braking, or whether the normal foot brake is also activated while performing the brake energy regeneration operation at the beginning of braking. Whether or not to make a decision is determined based on the amount of pressure accumulated in each accumulator 11, 14 at that time.

When it is determined that only the braking energy regenerating operation is performed at the beginning of braking, the process proceeds to step 4, the fifth solenoid valve 39 is turned off, and the supply of air to the actuator 37 is stopped. As a result, until the brake pedal 31 comes into contact with the rotating plate 34, the piston portion 38 is free from the brake pedal 31, and the driver depresses the brake pedal 31 to rotate the brake pedal 31. Even if the rotary plate 34 is rotated by a predetermined angle around the fulcrum 32, the rotary plate 34 does not rotate around the rotary fulcrum 32. Therefore, the push part 35 does not press the pressing part 17 of the brake valve 16, and as shown by the solid line in FIG. 4, at the beginning of braking (for example, up to the angle α), even if the driver depresses the brake pedal 31, Only the braking energy regeneration operation is performed.

On the other hand, at the beginning of braking, when it is determined that the normal foot brake is also operated while performing the brake energy regeneration operation, the process proceeds to step 5, the fifth solenoid valve 39 is turned on, and air is supplied to the actuator 37. Supply. As a result, the brake pedal 31 and the rotating plate 34 are integrated via the piston portion 38, and thus the brake pedal 31 and the rotating plate 34 are brought into an interlocking state. As a result, when the driver depresses the brake pedal 31, the rotary plate 34 simultaneously rotates around the rotary fulcrum 32, so that the push portion 35 pushes the push portion 17 of the brake valve 16, and FIG. As shown by the dotted line, the foot brake works from the beginning of braking. That is, the normal foot brake is also activated while the brake energy regeneration operation is performed.

That is, the functions of the fifth solenoid valve 39, the actuator 37, the piston portion 38 and the step 5 function as the interlocking means. Furthermore, the functions of step 3 to step 5 fulfill the function of the control means. In step 6, the first to third solenoid valves 9, 12, 15 are drive-controlled. That is, the first solenoid valve 9 and the second solenoid valve 12 which are respectively interposed in the low pressure oil passage 10 and the high pressure oil passage 13 are opened, and the third solenoid valve 15 bypassing the pump motor 8 is closed.

In step 7, the electromagnetic clutch 7 is connected and controlled to connect the pump motor 8 to the wheel drive system. In step 8, from the map showing the relationship between the previously stored depression amount θ of the brake pedal 31 and the control current i of the swash plate of the pump motor 8, the depression amount θ of the brake pedal 31 input from the potentiometer 25 is corresponded. The control current i to be searched is searched.

In step 9, the retrieved current value i is output to the swash plate drive device 27. If it is determined in step 1 that there is no brake request, the routine is returned without performing the routine. On the other hand, when the determination in step 2 is NO, the process proceeds to step 21, in which the pump motor 8 is not connected to the wheel drive system and the normal foot brake operation is performed.

That is, according to the above configuration, the depression amount θ of the brake pedal 31 is measured by the potentiometer 25 while the brake valve 16 used in the conventional foot brake is used as it is, and the depression amount θ is set to the depression amount θ. Since the brake energy regenerator is operated based on this, there is no need to replace the brake valve, and costs can be reduced.

In addition, at the beginning of braking, it is determined from the accumulated pressure amount at that time whether only the brake energy regenerating operation is performed, or whether the normal foot brake is operated while performing the brake energy regenerating operation at the beginning of braking. Further, since the brake energy regeneration device is operated based on the depression amount θ of the brake pedal 31, the load of the pump motor 8 can be set in accordance with the braking force required by the driver, It is possible to obtain the same feeling as a foot brake, and there is no discomfort between when the regenerative brake is operating and when it is not operating, and constant braking characteristics are always obtained.

Next, a second embodiment of the present invention will be described. Since the configuration of the entire apparatus is the same as that of the first embodiment described above, the description thereof will be omitted. As the configuration according to the second embodiment, the brake pedal portion is configured as shown in FIG. Note that, in FIG. 5, the same components as those of the brake pedal portion shown in FIG.

An actuator 41 is provided between the brake pedal 31 and the pressing portion 17 of the brake valve 16. The actuator 41 has a rod portion 42 that expands and contracts when the supply of hydraulic pressure is controlled by the sixth solenoid valve 44, and a push end portion 43 that is in constant contact with the pressing portion 17 is provided at the tip of the rod portion 42. It is provided. Then, in the actuator 41, the supply of hydraulic pressure is controlled by the sixth electromagnetic valve 44, and the push end portion 43 is in contact with the pressing portion 17, or the push end portion 43 is free from the pressing portion 17. Controlled to one of the states.

The brake pedal section having the above-described structure also has the same operation and effect as those of the first embodiment described above. Further, in the second embodiment, since the actuator 41 is hydraulically controlled, there is an effect that the size can be further reduced.

[0028]

[Effect of device]

 As described above, the brake energy regenerating apparatus according to the present invention includes the interlocking means for interlocking the brake pedal and the pressing portion of the operating fluid pressure supplying means for supplying the operating fluid pressure to the braking means. When the braking means is operated while the deceleration energy is regenerated at the beginning of braking and the braking means is operated, and the deceleration energy is only regenerated at the beginning of braking. Since it is configured to be in the non-interlocking state, it is possible to use the conventional brake valve as the fluid pressure supply means for actuation as it is, and there is an effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a schematic side view of a brake pedal unit according to the first embodiment of the present invention.

FIG. 3 is a control flowchart of the first embodiment.

FIG. 4 is a control characteristic diagram for explaining the operation of the first embodiment.

FIG. 5 is a schematic side view of a brake pedal unit according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Engine body 8 Pump motor 11 Low pressure side accumulator 14 High pressure side accumulator 16 Brake valve 17 Pressing part 25 Potentiometer 31 Brake pedal 34 Rotating plate 37 Actuator 38 Piston part

Claims (1)

[Scope of utility model registration request] 1. A brake pedal, and an operating fluid pressure supply means for supplying an operating fluid pressure to a braking means when the pressing portion is pressed by the brake pedal.
Brake energy provided with a depression amount detection means for detecting the depression amount of the brake pedal, and a brake energy regeneration means for regenerating deceleration energy during vehicle braking based on the depression amount of the brake pedal detected by the depression amount detection means. In the regenerative device, interlocking means for interlocking the brake pedal and the pressing portion is interposed between the brake pedal and the pressing portion,
A brake characterized by including control means for bringing the interlocking means into an interlocking state when the braking means is operated while regenerating deceleration energy at the beginning of braking, and to a non-interlocking state when only regenerating deceleration energy at the beginning of braking. Energy regeneration device.