KR20100113729A - Regenerative brake system - Google Patents

Abstract

PURPOSE: A regenerative braking apparatus is provided to perform stable fail-safe by sharing the braking oil pressure of a rear-wheel with the actuator of a front-wheel when the actuator is malfunction. CONSTITUTION: A rear-wheel braking part(5), a front-wheel braking part(10), and an oil pressure interlocking part(30) are prepared. The rear-wheel braking part forms an oil pressure in order to brake a vehicle. The front-wheel braking part forms an oil pressure by driving an actuator(11) which is separately driven from the rear-wheel braking part. The front-wheel braking part brakes front-wheels. The oil pressure interlocking part outputs the oil pressure with respect to the front-wheel braking part based on the oil pressure of the rear-wheel braking part.

Description

Regenerative brake system

The present invention is related to the application No. 10-2009-0012388 (2009.2.16) filed by the applicant of the domestic application, to enhance the fail-safe (Fail-Safe) function.

Application No. 10-2009-0012388 (2009.2.16) filed by the applicant in Korea is an EHB (Electro-Hydraulic Brake) or ESC (Electronic Stability Control) premium, which requires a separate device for increasing costs and preventing pedal deterioration. Since the same device is not applied, it is possible to provide a regenerative braking device which is low in manufacturing cost and does not lower the pedal feel of the driver without using a separate separation device.

In the regenerative braking device as described above, when the driver presses the pedal, the front wheel is operated by the electric actuator, and the rear wheel is an independent and cooperative control which is operated by the pedal force of the driver.

In this way, when the rear wheels are braked by human force without a booster, the pedal ratio generated from the pedals is increased, and the rear calipers (or drums) also make the piston diameter larger for backing up against the braking hydraulic pressure.

However, the increase in the piston diameter of the rear wheel caliper (or drum) causes a phenomenon in which the hydraulic lift between the rear wheel and the front wheel is different from each other, which causes inconvenience inevitably requiring design consideration to consider the hydraulic lift of the front wheel and the rear wheel. .

In particular, in the case of the front wheel using the actuator, the actuator must bear all the required loads even after the booster full load point (power limit point), which increases the specification of the actuator, that is, the motor specification of high power (about 800 W or more). You have a vulnerability that requires

Accordingly, the present invention has been invented in view of the above, and the braking hydraulic pressure of the rear wheel generated by the pedal response input forms the braking hydraulic pressure on the front wheel side using the actuator, and additionally, the generated braking hydraulic pressure is larger than the booster full load point ( The purpose of the present invention is to provide a regenerative braking device capable of reducing the load on the front wheel actuator for the section after the power limit limit), thereby lowering the specification of the actuator.

In addition, the present invention is able to implement a more stable fail-safe (fail-safe) supplied with a braking hydraulic pressure that implements braking in the front wheel, along with the rear wheel is braking even if the front wheel actuator is a failure (Fail) It is an object to provide a regenerative braking device.

The present invention for achieving the above object, the regenerative braking device to form a hydraulic pressure by the depression of the pedal (1) for the vehicle braking, the rear wheel braking portion (5) to perform a braking action for the rear wheel;

A front wheel braking unit (10) which generates hydraulic pressure by driving an actuator (11) installed to drive independently of the rear wheel braking unit (5) and performs a braking action on the front wheel;

A hydraulic linkage unit 30 configured to output hydraulic pressure applied to the front wheel brake unit 10 by inputting the hydraulic pressure generated from the rear wheel brake unit 5;

Characterized in that configured to include.

In addition, the regenerative braking device drives the actuator 11 by detecting a change in the stroke of the pedal 1, and uses the stroke change of the pedal 1 and the detected braking hydraulic pressure on the front wheel side of the actuator 11. By adjusting the power size, the amount of braking force of the front wheel is varied, and opening / closing a transmission path of hydraulic pressure transmitted from the rear wheel braking part 5 toward the front wheel braking part 10 to operate the hydraulic linkage part 30. It characterized in that the configuration including the ECU 20 for controlling the.

The rear wheel master cylinder 6 constituting the rear wheel braking unit 5 to form hydraulic pressure through the pedal 1 forms at least two hydraulic chambers having different discharge paths.

The front wheel brake 10 includes an actuator 11 driven when the stroke of the pedal 1 changes, a front wheel master cylinder 12 generating hydraulic pressure through the actuator 11, and the front wheel master cylinder 12. And an oil reservoir 13 for supplying oil to the rear wheel master cylinder 6 of the front wheel braking part 5.

The hydraulic linkage unit 30 is a hydraulic pressure generating line hydraulic pressure that is applied to the front wheel brake 10 by the action of the hydraulic linkage line 31 through which the rear wheel hydraulic pressure flows, and the hydraulic pressure introduced into the hydraulic linkage line 31. It is characterized by consisting of a connector (34).

The hydraulic connector 34 is provided with pistons 37 having different end diameters which are elastically supported by the return spring 39, and the piston 37 is connected to the rear end connecting housing 35 and the front connecting housing. The inside of 36 is sealed with a seal 38 and accommodated.

The hydraulic linkage unit 30 is provided with a rear end control valve 32 that is controlled to flow in or out of the hydraulic connector 34 toward the hydraulic linkage line 31, and is connected to the hydraulic linkage line 31. The front wheel hydraulic line 14 of the front wheel master cylinder 12 is provided with a shear control valve 33 for controlling the hydraulic flow of the front wheel master cylinder 12.

The ECU 20 controls the front and rear control valves 33 and 32.

The pedal 1 further includes a pedal sensor 4 that detects a stroke of the pedal 1 and transmits the stroke to the ECU 20, and the rear wheel braking unit 5 has a rear wheel master cylinder 6. A rear wheel pressure sensor 9 is further installed in the rear wheel hydraulic line 8 so as to detect the braking hydraulic pressure discharged from the vehicle and transmit the brake hydraulic pressure to the ECU 20. A front wheel pressure sensor is further installed in the front wheel hydraulic line 14 to detect the braking hydraulic pressure discharged from the vehicle and transmit the braking hydraulic pressure to the ECU 20.

In addition, the regenerative braking apparatus of the present invention includes a rear wheel braking unit 5 that generates hydraulic pressure by depressing the pedal 1 for braking the vehicle and performs a braking action on the rear wheel;

A front wheel braking unit (10) which generates hydraulic pressure by driving an actuator (11) installed to drive independently of the rear wheel braking unit (5) and performs a braking action on the front wheel;

Return to generate an output oil pressure applied to the front wheel brake part 10 by the action of the hydraulic pressure link line 31 through which the hydraulic pressure generated from the rear wheel brake part 5 flows, and the hydraulic pressure introduced into the hydraulic linkage line 31. A hydraulic connector 34 having a piston 37 supported by a spring 39, a rear end control valve 32 installed at the hydraulic linkage line 31 having the hydraulic connector 34, and the front wheel brake part. A hydraulic linkage unit 30 having a shear control valve 33 installed in the front wheel hydraulic line 14 connected to the front wheel master cylinder 12 constituting (10);

Characterized in that configured to include.

According to the present invention, the regenerative braking device forms an additional braking hydraulic pressure on the front wheel by using the braking hydraulic pressure of the rear wheel to reduce the load of the actuator, lowering the specification of the actuator from 800W to about 400W ~ 500W to minimize the specification and reduce power consumption And as a result of the improved fuel economy, there is an effect that can reduce the overall weight due to the weight reduction of the actuator.

In addition, the present invention shares the braking hydraulic pressure of the rear wheel brake is performed even if the front wheel actuator failure (Fail), there is an effect that can implement a more stable fail-safe (Fail-Safe).

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

1 is a diagram illustrating an installation configuration in which a regenerative braking apparatus according to the present invention is applied to an electric vehicle. It consists of a pair of pedals that interlock with each other.

For example, the pedal 1 applied to the present embodiment is a primary pedal for driver operation, and the primary pedal, as in the applicant's domestic application No. 10-2009-0012388 (2009.2.16) It is designed to have a pair of secondary pedals that interlock, and to have a high pedal ratio in a state in which the primary pedal and the secondary pedal are combined.

In addition, the regenerative braking device of the present embodiment receives a stroke of the pedal 1 directly to form a braking hydraulic pressure supplied to the rear wheel brake B, and a stroke of the pedal. The front wheel braking unit 10 for forming the braking hydraulic pressure required by the front wheel brake (A) is further provided.

The front and rear wheel brake units 5 and 10 as described above are independently implemented by separating the front wheel brake and the rear wheel brake, as in Korean Patent Application No. 10-2009-0012388 (2009.2.16) filed by the applicant. In consideration of this, one oil reservoir 13 installed toward the front wheel braking unit 10 is commonly used.

In addition, while the rear wheel braking unit 5 performs rear wheel braking by friction braking using only the driver's force without a booster between the pedal and the master cylinder, the front wheel braking unit 10 uses the actuator, so that the front wheel hydraulic braking force is variable. Even without affecting the rear wheel side, the pedal feel of the driver does not decrease.

The rear wheel braking unit 5 is connected to the oil reservoir 13 by the reservoir line 7 and has a rear wheel master cylinder 6 which forms braking hydraulic pressure when the pedal 1 is stepped on, and the left and right rear wheels And a rear wheel hydraulic line 8 composed of a pair of left and right hydraulic lines 8a and 8b respectively leading to the rear wheel brake B for braking the engine.

The rear wheel master cylinder 6 as described above forms at least two hydraulic chambers so that a part of the hydraulic pressure on the rear wheel braking part 5 is also discharged to the front wheel braking part 10.

To this end, the rear wheel master cylinder 6 has a main chamber 6a to which the rear wheel hydraulic line 8 is connected, and a subchamber adjacent to the main chamber 6a to discharge hydraulic pressure toward the front wheel brake 10. 6b).

As described above, in order to discharge the hydraulic pressure toward the front wheel brake unit 10 through the subchamber 6b, the hydraulic linkage unit 30 is formed in the present embodiment, and the configuration of the hydraulic linkage unit 30 will be described in detail later. .

The front wheel brake 10 generates an actuator 11 generating power according to a stroke of the pedal 1 and a braking hydraulic pressure of the front wheel brake A by the transmission power of the actuator 11. The front wheel master cylinder 12, the oil reservoir 13 storing the oil supplied to the front wheel master cylinder 12, and the braking hydraulic pressure generated by the front wheel master cylinder 12 are supplied to the front wheel brake A. The front wheel hydraulic line 14 is comprised.

The actuator 11 applies an electric booster.

In addition, the front wheel hydraulic line 14 as described above is composed of left and right hydraulic lines 14a and 14b respectively leading to the left and right front wheels, and the left and right hydraulic lines 14a and 14b are mounted on a wheel disk. Connect to the caliper (or drum) that is the front wheel brake (A).

In addition, in the present embodiment, as described above, the hydraulic linkage unit 30 that receives hydraulic pressure toward the rear wheel brake unit 5 and forms hydraulic pressure on the front wheel brake unit 10 is further installed, and the hydraulic linkage unit 30 is provided. Through additionally generated braking hydraulic pressure through to reduce the load on the front wheel actuator (11), it is possible to implement a stable fail-safe (Fail-Safe) in the event of a failure (Fail) of the actuator (11).

The hydraulic linkage unit 30 as described above generates an output to which hydraulic pressure is applied to the front wheel brake unit 10 by the action of the hydraulic linkage line 31 through which hydraulic pressure flows and the hydraulic pressure introduced into the hydraulic linkage line 31. It consists of a hydraulic connector 34.

The hydraulic linkage line 31 is connected between the rear wheel master cylinder 6 of the rear wheel brake 5 and the front wheel hydraulic line 14 of the front wheel brake 10, and the front wheel agent for quick response to hydraulic pressure. It is connected to the front wheel hydraulic line 14 to a position proximate to the front wheel master cylinder 12 side of the eastern part 10.

In this embodiment, the hydraulic linkage line 31 is directly connected to the rear wheel master cylinder 6, and as described above, the rear wheel master cylinder 6 has a subchamber 6b separately from the main chamber 6a. To form.

In addition, as shown in FIG. 2, the hydraulic connector 34 includes a housing connecting the hydraulic linkage line 31 and a piston having a contact area different from the front and rear ends thereof so that the output hydraulic pressure is increased compared to the input hydraulic pressure. 37 is received in the housing.

To this end, the housing is a rear end connecting housing 35 connecting the hydraulic linkage line 31 connected to the subchamber 6b of the rear wheel master cylinder 6, and the front wheel hydraulic line 14 of the front wheel brake 10. And a shear connection housing 36 connected thereto.

In the front and rear connection housings 36 and 35 as described above, hydraulic chambers 35a and 36a, which are spaces in which the piston 37 is moved hydraulically, are formed, and the diameters of the hydraulic chambers 35a and 36a are the pistons. It follows the shape of (37).

The front and rear connection housings 36 and 35 may be manufactured in an integrated form, but are preferably manufactured separately so as to be fastened and sealed by using bolts or screws.

In addition, the piston 37 is determined by the input / output ratio according to the size of the braking hydraulic pressure calculated at the time of design, and the cross-sectional area on which the hydraulic pressure is output compared to the side where the hydraulic pressure is input.

That is, the piston 37 has a front end portion 37a to which the input hydraulic pressure acts, and a rear end portion 37b to receive the hydraulic pressure and to be pushed out to form the discharge hydraulic pressure. It has a larger value than the cross-sectional area B of the end portion 37b.

For this reason, when the hydraulic pressure of the rear wheel master cylinder 6 acts on the piston 37, the hydraulic pressure acting on the front and rear ends 37a and 37a is PA = P'A ', so that both ends of the piston 37 Even if the applied pressures P and P 'are different, the hydraulic pressure of the same size can be output by the difference between the cross-sectional areas A and A'.

When the piston 37 is assembled in the housing, the front end portion 37a is located in the hydraulic chamber 35a of the rear end connection housing 35, and the rear end 37b is the rear end connection housing 35. It is located in the hydraulic chamber (36a) of the front end connection housing 36 in the hydraulic chamber (35a) of the, to move the rear and front connection housing (35, 36) by the action of hydraulic pressure.

In addition, the piston 37 is airtight with respect to the hydraulic chambers 35a and 36a of the rear and front connection housings 35 and 36 due to the characteristic of moving the rear and front connection housings 35 and 36 by the action of hydraulic pressure. It is formed, and the seal 38 positioned at the front and rear ends 37a and 37b is usually used.

In addition, the piston 37 is further provided with a return spring 39 for returning to the initial state when the hydraulic release to the rear wheel master cylinder 6 side, the return spring 39 is to be compressed when the piston 37 is pushed out The shear connection housing 36 side of 37 is elastically supported.

The rear connecting housing 36 has a hollow inside so that the return spring 39 is inserted and elastically supported, and the hollow hole of the rear connecting housing 36 has a partition wall separating the front connecting housing 35. It is divided into

In addition, the hydraulic linkage unit 30 according to the present embodiment further includes a pair of control valves to control the operation of the hydraulic connector 34 to which the hydraulic pressure introduced into the hydraulic linkage line 31 acts.

The control valve as described above is installed at the position before the hydraulic linkage line 31 is connected to the hydraulic connector 34, the rear end control valve 32 for controlling the hydraulic discharge of the rear wheel master cylinder (6), and the hydraulic linkage The line 31 is provided at a position before being connected to the front wheel hydraulic line 14 of the front wheel master cylinder 12 and constitutes a shear control valve 33 for controlling the hydraulic discharge of the front wheel master cylinder 12.

In this case, the rear end control valve 32 may be installed at the front end or the rear end of the hydraulic connector 34.

The front and rear control valves 33 and 32 as described above are solenoid valves that are controlled on / off, and the rear wheel braking unit 5 may fail when the actuator 11 constituting the front wheel brake unit 10 fails. Implement a fail-safe (Fail-Safe) to generate the braking hydraulic pressure on the front wheel brake (10) side.

The regenerative braking apparatus according to the present embodiment is controlled using the ECU 20 as shown in FIG. 1, and the ECU 20 is an ECU that is a kind of controlling a running vehicle. The control unit also applies.

The ECU 20 as described above receives a signal from the pedal sensor 4 that detects the stroke of the pedal 1, controls the power of the actuator 11 of the front wheel brake 10, and the hydraulic pressure. Control of the front and rear end control valves 33 and 32 constituting the interlocking part 30 is implemented.

That is, when the ECU 20 senses the stroke of the pedal 1 through the pedal sensor 4, the actuator 20 drives the actuator 11 to operate the front wheel brake 10, and at the same time the front / rear control valve ( The on / off control of 33, 32 opens or closes the flow path to implement normal operation or fail-safe.

In addition, the ECU 20 forms a plurality of pressure sensors and circuits installed in the rear wheel brake unit 5 and the front wheel brake unit 10 as shown in FIG. 1 to control the regenerative braking device.

For example, the rear wheel pressure sensor 9 is installed in the rear wheel braking unit 5. The rear wheel pressure sensor 9 is constituted by one, and it is easy to measure the hydraulic pressure discharged from the rear wheel master cylinder 6. Install in one location.

The rear wheel pressure sensor 9 contributes to improving stroke detection accuracy of the pedal 1 in the ECU 20, and implements fail-safe for the pedal sensor 4. Since it is a concept, it is not necessary to actually install it.

In addition, the front wheel brake unit 10 is provided with a pair of left and right front wheel pressure sensors 15 and 16, and the pair of left and right front wheel pressure sensors 15 and 16 are supplied to the left and right front wheels. The oil pressure is measured and provided to the ECU 20.

Since the ECU 20 is for controlling the actuator 11 using the values measured by the left and right front wheel pressure sensors 15 and 16, the left and right front wheel pressure sensors 15 and 16 are left and right. In order to accurately measure the braking hydraulic pressure that affects the braking state of the front wheels, install them as close as possible to the front left and right wheels.

In this way, the target control of the actuator 11 through the ECU 20 is for realizing the characteristics of the regenerative braking. For this purpose, the ECU 20 uses the left and right front wheel pressure sensors 15 and 16 to apply the braking hydraulic pressure. Monitoring and changing the power of the actuator 11 during the braking process to vary the braking hydraulic pressure on the front wheel brake (A).

Such a regenerative braking device according to the present embodiment has a normal braking that causes rear wheel braking to implement friction braking and front wheel braking to implement regenerative braking when the driver presses the pedal 1, and a failure of the actuator 11 occurs. Implement Fail-Safe according to

In normal braking, rear wheel braking, which requires less braking force than front wheel braking, is implemented by directly receiving the driver's force through the pedal 1, and the front wheel braking is carried out by the ECU 20, which detects the stroke of the pedal 1. It is implemented using the power of the actuator 11 to drive.

As shown in FIG. 3, when the driver presses the pedal 1 and a stroke change occurs, the rear wheel braking is performed through the pedal input of the pedal 1 and at the same time, through the power of the actuator 11 due to the stroke change amount of the pedal 1. Front wheel braking occurs.

The pedal 1 pressurizes the rear wheel master cylinder 6 by implementing a pedal ratio that greatly increases the driver's response input, as applied to the applicant's domestic application No. 10-2009-0012388 (2009.2.16).

As described above, the rear wheel braking is performed when the braking hydraulic pressure generated by the operation of the rear wheel master cylinder 6 through the pedal 1 is discharged to the pair of left and right hydraulic lines 8a and 8b, respectively. It is transmitted to the rear wheel brake B and is implemented by the operation of the rear wheel brake B.

In such rear wheel braking, the ECU 20 calculates the stroke of the pedal 1 through the pedal sensor 4 and at the same time calculates the braking hydraulic pressure supplied to the rear wheel brake B through the rear wheel pressure sensor 9. Next, the correct stroke of the pedal 1 is calculated using the measured values of the pedal sensor 4 and the rear wheel pressure sensor 9.

Calculation of the correct stroke of the pedal 1 through the ECU 20 may contribute to precise control of the actuator 11 that operates during front wheel braking.

Since the rear wheel braking is implemented through the pedal 1 stepped by the driver, the braking force always acts on the rear wheel even if the front wheel braking hydraulic pressure is not generated due to a failure of the actuator 11.

This state is a state that can implement a fail-safe to some extent, but in the present embodiment by using a hydraulic linkage unit 30 that connects the rear wheel brake unit 5 to the front wheel brake unit 10 side. Reliable implementation

3 is a control state in which the front wheel side does not form an additional braking hydraulic pressure using the rear wheel braking hydraulic pressure in addition to the braking hydraulic pressure through the actuator 11.

This control is not a preferred case in this embodiment, but is a basic control method for more effectively describing various control methods that can be implemented by the ECU 20.

When hydraulic pressure is generated in the main chamber 6a and the subchamber 6b of the rear wheel master cylinder 6 through the pedal 1 during rear wheel braking, the hydraulic pressure toward the main chamber 6a is a pair of left and right hydraulic lines. Although discharged to 8a and 8b and converted to the braking force of the rear wheel, the hydraulic pressure toward the subchamber 6b is blocked.

The ECU 20 closes the rear end control valve 32 installed in the hydraulic linkage line 31 to shut off the hydraulic pressure to the subchamber 6b, which is represented in FIG. 3.

Meanwhile, front wheel braking is performed in a manner independent of rear wheel braking because the ECU 20 drives the actuator 11 by calculating the stroke of the pedal 1 using the pedal sensor 4.

When the braking hydraulic pressure generated in the front wheel master cylinder 12 by the driving of the actuator 11 is supplied to the front wheel brake A through the pair of left and right hydraulic lines 14a and 14b, respectively, to the left and right front wheels, respectively. Braking is achieved by operation of the mounted front wheel brake A.

Due to the characteristics of regenerative braking during front wheel braking, the ECU 20 controls the power of the actuator 11 to vary the braking force of the left and right front wheels to perform target control on the front wheel master cylinder 12.

To this end, the ECU 20 includes a front wheel using a pair of left and right front wheel pressure sensors 15 and 16 together with stroke detection values of the pedal 1 using the pedal sensor 4 and the rear wheel pressure sensor 9. The brake hydraulic pressure detection value on the brake A side is used as a control factor.

That is, the ECU 20 calculates the braking hydraulic pressure at the time of measurement through a pair of left and right front wheel pressure sensors 15 and 16 and calculates a pedal calculated through the pedal sensor 4 and the rear wheel pressure sensor 9. In consideration of the stroke change of (1), the required braking force magnitude is calculated, and then the power of the actuator 11 is changed accordingly.

For example, if the result of the calculation of the ECU 20 requires an increase in the magnitude of the front wheel braking force, the ECU 20 increases the current supply of the actuator 11 to use the relatively large power to the front wheel master cylinder 12. If the amount of braking hydraulic pressure is increased and conversely it is necessary to reduce the magnitude of the front wheel braking force as a result of the calculation of the ECU 20, the ECU 20 reduces the current supply of the actuator 11 and uses the front wheel master cylinder by using a relatively small power. Reduce the braking hydraulic pressure of (12).

In this way, even if the front wheel braking force change occurs, since the front wheel braking unit 10 does not have a structure that is mechanically connected to the pedal 1 side that brakes the rear wheel side, the pedal feeling of the pedal 1 decreases due to the braking force change. Does not happen.

During the front wheel braking as described above, the ECU 20 is a front wheel hydraulic line connected to the hydraulic linkage line 31 leading to the front wheel irrespective of the linkage with the hydraulic linkage unit 30 for implementing fail-safe. The shear control valve 33 installed at (14) side is kept open.

However, when the ECU 20 closes the rear control valve 32 to block the rear brake hydraulic pressure during the normal braking, the actuator 11 has a large load, which is not preferable, and thus the hydraulic linkage ( The control state associated with 30) will be described.

4 illustrates a state in which brake hydraulic pressure, which is additionally formed using the rear wheel hydraulic pressure, is applied in addition to the braking hydraulic pressure that is formed through the actuator 11 at the front wheel side in a situation where normal braking is implemented.

In this case, the ECU 20 maintains the opening of the front control valve 33 installed in the front wheel hydraulic line 14 of the front brake 10, and the hydraulic pressure of the rear wheel master cylinder 6 is hydraulically linked. The rear end control valve 32 is opened to flow into the hydraulic connector 34 through the line 31.

As described above, when the rear stage control valve 32 is switched to the open state, the hydraulic pressure generated in the rear wheel master cylinder 6 operated through the pedal 1 flows to the hydraulic linkage line 31 and the hydraulic connector 34. Flows into the side, acting as input.

At this time, the rear wheel master cylinder (6) is the hydraulic pressure is formed in the main chamber (6a) and the subchamber (6b), the braking hydraulic pressure toward the main chamber (6a) is a pair of left and right hydraulic lines (8a, 8b) Is discharged to the rear wheel braking force, but the hydraulic pressure toward the subchamber 6b is discharged toward the hydraulic linkage line 31.

The hydraulic pressure supplied from the rear wheel master cylinder 6 to the hydraulic connector 34 is converted to the output again and applied to the front wheel, whereby the front wheel side is in addition to the braking hydraulic pressure formed by the actuator 11, thereby providing rear hydraulic pressure. The additional braking hydraulic pressure used will work together.

The operation of the hydraulic connector 34 as described above is implemented through the internal piston 37, which is the same as the fail-safe implementation to be described later, fail-safe (Fail-Safe) It is described in detail in the description.

As such, the increase in the front-side braking hydraulic pressure can reduce the load on the actuator 11 by an increase amount. g) can be reduced from about 800W high specification to about 400W to 500W low specification, thereby achieving various effects.

On the other hand, the regenerative braking device according to the present embodiment uses the hydraulic pressure of the rear wheel braking unit 5 which is always operated through the pedal 1 when the braking hydraulic pressure is not generated due to the abnormality of the front wheel braking unit 10. It is possible to implement a fail-safe (Fail-Safe) to form a braking hydraulic pressure to the east (10) side.

5 illustrates such a fail-safe implementation state. For this purpose, the ECU 20 includes a hydraulic linkage unit connecting the rear wheel brake unit 5 and the front wheel brake unit 10 to the hydraulic linkage line 31. Control (30) to implement.

When braking hydraulic pressure is not formed through the front wheel brake unit 10 during braking, various occurrences occur. However, since all of the same results occur due to the lack of braking hydraulic pressure, the actuator 11 is driven by the ECU 11 while the driver steps on the pedal 1. It demonstrates only when it does not respond to control of 20).

At this time, since the rear wheel braking unit 5 normally implements braking by the braking hydraulic pressure formed through the rear wheel master cylinder 6 to which the pedal 1 directly operates, the rear wheel braking unit 5 operates in the same manner as in the normal braking state.

However, when the actuator 11 does not respond to the control of the ECU 20 that detects the change in the stroke of the pedal 1, the ECU 20 determines that the front wheel brake 10 is a failure and fails. Implement fail-safe control.

For fail-safe control as described above, the ECU 20 opens the rear end control valve 32 installed in the hydraulic linkage line 31, and the hydraulic linkage line 31 connected to the front wheel is connected. The front control valve 33 on the front wheel hydraulic line 14 is closed.

When the rear stage control valve 32 is opened, the braking hydraulic pressure generated in the subchamber 6b of the rear wheel master cylinder 6 is discharged toward the hydraulic linkage line 31 by the action of the pedal 1, but the closed front control valve ( 33) the front wheel hydraulic line 14 leading to the front wheel master cylinder 12 is interrupted.

The braking hydraulic pressure discharged toward the hydraulic linkage line 31 flows into the hydraulic connector 34 through the rear end control valve 32, and the hydraulic connector 34 generates an output by using the braking hydraulic pressure as an input to generate a front end control valve. At 33, braking hydraulic pressure is formed on the front wheel hydraulic line 14 connecting the front wheel brake A.

This action is implemented through the operation of the hydraulic connector 34, which is shown in FIG. 6.

As illustrated in FIG. 6, the braking hydraulic pressure input to the hydraulic connector 34 is converted into a pressure for pressing the piston 37 while filling the hydraulic chamber 35a of the rear connection housing 35. It is pushed toward the hydraulic chamber 36a of the shear connection housing 36.

Such movement of the piston 37 pushes the front oil of the piston 37 to form a braking hydraulic pressure, and the formed braking hydraulic pressure acts as a braking force on the front wheel brake A side through the left and right hydraulic lines 14a and 14b. do.

At this time, the piston 37 has a larger diameter (A> A ') compared to the rear end portion 37b on which the front end portion 37a, on which the braking hydraulic pressure is input, forms the opposite side, and thus, before and after the piston 37 The pressure is equally formed with PA = P'A '.

Then, when the input to the piston 37 is released, it is returned to its initial state by the action of the return spring 39 which was compressed when the piston 37 was pushed out.

In this way, since the hydraulic connector 34 receives the rear wheel hydraulic pressure as an input and generates an output to the front wheel, the braking hydraulic pressure can act on the front wheel even when the actuator 11 fails, so that a more stable and reliable fail- Implement fail-safe.

1 is an installation configuration in which the regenerative braking apparatus according to the present invention is applied to an electric vehicle

2 is a sectional view of a hydraulic connector according to the present invention;

Figure 3 is a normal braking operation of the regenerative braking device according to the present invention

4 shows a preferred normal braking operation of the regenerative braking device according to the invention.

5 is a fail-safe operation diagram of the regenerative braking apparatus according to the present invention.

Figure 6 is a pressure formation of the hydraulic connector according to the present invention

   <Description of the symbols for the main parts of the drawings>

1: Pedal 4: Pedal Sensor

5: rear wheel brake

6,12: Rear and front wheel master cylinder

6a: main chamber 6b: subchamber

7: reservoir line

8,14: Rear and front wheel hydraulic line

8a, 8b: Left and right hydraulic lines

9: rear wheel pressure sensor

10: front wheel braking unit 11: the actuator

13: Oil reservoir 14a, 14b: Left and right hydraulic line

15,16: Left and right front wheel pressure sensor

20: ECU 30: hydraulic linkage

31: hydraulic interlocking lines 32, 33: back and front control valve

34: hydraulic connector 35: rear connection housing

35a, 36a: hydraulic chamber 36: shear connection housing

37: piston 37a, 37b: front and rear ends

38: seal 39: return spring

A, B: Front and rear brakes

Claims (13)

A rear wheel braking unit which generates hydraulic pressure by depressing a pedal for braking the vehicle and performs a braking action on the rear wheel; A front wheel braking unit configured to generate hydraulic pressure by driving an actuator provided to be driven independently of the rear wheel braking unit, and perform a braking action on the front wheel; A hydraulic linkage unit configured to output hydraulic pressure applied to the front wheel brake unit by inputting the hydraulic pressure generated from the rear wheel brake unit; Regenerative braking device comprising a. The method of claim 1, wherein the actuator is driven by detecting a change in the stroke of the pedal, and the magnitude of the braking force of the front wheel is varied by adjusting the power magnitude of the actuator using the stroke change of the pedal and the detected braking hydraulic pressure on the front wheel. And an ECU for controlling the operation of the hydraulic linkage by opening and closing a transmission path of hydraulic pressure transmitted from the rear wheel braking portion to the front wheel braking portion. The regenerative braking device according to claim 1, wherein the rear wheel master cylinder constituting the rear wheel braking unit to generate hydraulic pressure through the pedal has at least two hydraulic chambers having different discharge paths. The regenerative braking apparatus according to claim 3, wherein the hydraulic chamber is a main chamber connected to a rear wheel hydraulic line connected to the rear wheel, and a subchamber connected to the hydraulic linkage connected to the front wheel hydraulic line forming the front wheel brake. The method of claim 1, wherein the front wheel brake and the actuator driven when the stroke of the pedal changes; A front wheel master cylinder generating hydraulic pressure through the actuator; And an oil reservoir attached to the front wheel master cylinder and configured to supply oil to the rear wheel master cylinder of the front wheel brake unit. The hydraulic linkage unit of claim 1, wherein the hydraulic linkage unit comprises a hydraulic linkage line through which rear wheel hydraulic pressure flows, and a hydraulic connector configured to generate output hydraulic pressure added to the front wheel brake unit by the action of the hydraulic pressure introduced into the hydraulic linkage line. Braking system. The regenerative braking device according to claim 6, wherein the hydraulic connector is provided with pistons having different end diameters which are elastically supported by a return spring. The regenerative braking device according to claim 7, wherein the piston has a diameter larger than a side at which the hydraulic pressure is input from the rear wheel side than a side outputting the hydraulic pressure to the front wheel side. The regenerative braking device according to claim 8, wherein the piston is hermetically sealed and sealed in the rear connection housing and the front connection housing coupled to each other. The front wheel hydraulic line of claim 6, wherein the hydraulic linkage includes a rear end control valve installed at the hydraulic linkage line, the rear end control valve being controlled to flow in or shut off the hydraulic pressure toward the hydraulic connector, and connected to the hydraulic linkage line. Regenerative braking device characterized in that the shear control valve for controlling the hydraulic flow of the master cylinder is installed. The regenerative braking device according to claim 10, wherein the front and rear control valves are controlled by an ECU. The method of claim 2, wherein the pedal is further provided with a pedal sensor for detecting the stroke (Stroke) of the pedal and transmits to the ECU, The rear wheel brake unit is further provided with a rear wheel pressure sensor in the rear wheel hydraulic line to detect and transmit the braking hydraulic pressure discharged from the rear wheel master cylinder to the ECU. And the front wheel brake sensor is further installed in the front wheel hydraulic line to detect and transmit the brake hydraulic pressure discharged from the front wheel master cylinder to the ECU. A rear wheel braking unit which generates hydraulic pressure by depressing a pedal for braking the vehicle and performs a braking action on the rear wheel; A front wheel braking unit configured to generate hydraulic pressure by driving an actuator provided to be driven independently of the rear wheel braking unit, and perform a braking action on the front wheel; A hydraulic connector including a hydraulic linkage line through which the hydraulic pressure generated from the rear wheel brake part flows, and a piston supported by a return spring to generate an output hydraulic pressure applied to the front wheel brake part by the action of the hydraulic pressure introduced into the hydraulic linkage line; A hydraulic control linkage having a rear end control valve installed at the hydraulic linkage line having the hydraulic connector and a front control valve installed at a front wheel hydraulic line connected to the front wheel master cylinder forming the front wheel brake; Regenerative braking device comprising a.

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