Hydraulic decoupling brake control booster

Abstract

The invention discloses a hydraulic decoupling brake control booster which comprises a main brake unit, the main brake unit comprises a first oil pipe and a second oil pipe, the first oil pipe is sequentially provided with a test valve, a simulation cavity and a simulation cavity isolation valve, the simulation cavity is connected with a brake pedal, and the second oil pipe is connected with a control valve. A liquid level monitoring valve, a pressurizing cavity and a pressurizing cavity isolating valve are sequentially arranged on the second oil pipe, the pressurizing cavity is connected with a transmission mechanism, and the transmission mechanism is connected with a motor. According to the hydraulic decoupling brake control booster, the brake calipers are controlled through the main brake unit and the backup brake unit, when the main brake unit fails, redundant brake can be conducted, and when the main brake unit and the backup brake unit both fail, mechanical brake can be conducted, and the brake safety is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile brakes, and in particular relates to a hydraulic decoupling brake control booster. Background Art

[0002] The hydraulic decoupling brake control booster is a key component in the automobile braking system. Its main function is to assist the driver in applying braking force through hydraulic means. Its working principle is to use the hydraulic system to amplify the force of the driver's brake pedal, so that the vehicle can brake more effectively.

[0003] The existing technology combines the intelligent integrated brake system (IPB) and the redundant backup module (RBU), that is, adding a pressure unit on the basis of the existing ONEBOX, which is costly and has limited redundancy. The output stroke of the analog cavity double cavity is short, and the driver will cross two empty strokes when stepping on the pedal, causing the pedal feel to fluctuate. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic decoupling brake control booster to solve the problem in the prior art that the output stroke of the analog cavity double cavity is short, and the driver will cross two empty strokes when stepping on the pedal, causing the pedal feeling to fluctuate.

[0005] To this end, the present invention provides a hydraulic decoupling brake control booster, including a main brake unit, the main brake unit including a first oil pipe and a second oil pipe, the first oil pipe is sequentially provided with a test valve, a simulation chamber and a simulation chamber isolation valve, the simulation chamber is connected to a brake pedal, the second oil pipe is sequentially provided with a liquid level monitoring valve, a boost chamber and a boost chamber isolation valve, the boost chamber is connected to a transmission mechanism, and the transmission mechanism is connected to a motor.

[0006] Preferably, the test valve is provided with a bypass one-way valve.

[0007] Preferably, a simulation chamber pressure sensor is connected between the simulation chamber and the simulation chamber isolation valve.

[0008] Preferably, a simulation valve and a pedal feel simulator are connected between the simulation chamber pressure sensor and the simulation chamber isolation valve.

[0009] Preferably, a travel sensor is connected to the brake pedal.

[0010] Preferably, the motor is connected to a motor zero position sensor and a motor current sensor.

[0011] Preferably, a boost chamber pressure sensor is connected between the boost chamber and the boost chamber isolation valve.

[0012] Preferably, the first oil pipe and the second oil pipe are connected via a connecting pipe.

[0013] Preferably, a circuit isolation valve is provided on the connecting pipe.

[0014] Preferably, it also includes an oil pot, a backup brake unit and a brake caliper, the main brake unit is connected to the oil pot through an oil pipe, the backup brake unit is connected to the active brake unit through an oil pipe, the backup brake unit is connected to the oil pot through an oil pipe with a one-way valve, and the brake caliper is connected to the backup brake unit through an oil pipe.

[0015] Beneficial effects:

[0016] 1. The present invention provides a hydraulic decoupling brake control booster, which controls the brake caliper through the main brake unit and the backup brake unit. When the main brake unit fails, redundant braking can be performed. When both the main brake unit and the backup brake unit fail, mechanical braking can be performed to ensure the safety of braking.

[0017] 2. The present invention provides a simulation chamber in the main brake unit to ensure mechanical redundancy backup and avoid pedal feel fluctuation caused by double simulation chambers.

[0018] 3. The present invention provides pedal feedback to the driver through a pedal feel simulator, and feeds back the driver's braking demand based on a stroke sensor, thereby achieving full decoupling wire control and improving the driver's driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a hydraulic decoupling brake control booster in the present invention.

[0021] In the figure: 1-oil pot, 2-main brake unit, 210-first oil pipe, 211-test valve, 212-simulation chamber, 213-simulation chamber isolation valve, 214-brake pedal, 215-simulation chamber pressure sensor, 216-simulation valve, 217-pedal feel simulator, 218-bypass one-way valve, 219-stroke sensor, 220-second oil pipe, 221-liquid level monitoring valve, 222-boost chamber, 223-boost chamber isolation valve, 224-transmission mechanism, 225-motor, 226-motor zero position sensor, 227-motor current sensor, 228-boost chamber pressure sensor, 230-connecting pipe, 231-loop isolation valve, 3-backup brake unit, 4-brake caliper, 5-one-way valve. DETAILED DESCRIPTION

[0022] The content of the present invention can be more easily understood by selecting the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0023] Embodiment 1:

[0024] like Figure 1 As shown, in this embodiment, a hydraulic decoupling brake control booster is provided, including an oil pot 1, a main brake unit 2, a backup brake unit 3 and a brake caliper 4. The main brake unit 2 is connected to the oil pot 1 through an oil pipe, the backup brake unit 3 is connected to the active brake unit through an oil pipe, the backup brake unit 3 is connected to the oil pot 1 through an oil pipe with a one-way valve 5, and the brake caliper 4 is connected to the backup brake unit 3 through an oil pipe. There are four brake calipers 4 in this embodiment, and the number of brake calipers 4 can be specifically set according to actual conditions, and the present invention does not make specific restrictions. The main brake unit 2 is used to respond to the braking request of the driver or the automatic driving system (ADAS), and generate 4 hydraulic oils to the four brake calipers 4, of which two brake calipers 4 constitute the FR-RL circuit, and the other two brake calipers 4 constitute the FL-RR circuit. The backup brake unit 3 is used to replace the main brake unit 2 to respond to the braking request of the driver or the automatic driving system in the case of failure of the main brake unit 2, and drive the four brake calipers 4 to generate clamping force. The backup brake unit 3 is a prior art, and its specific structure is not repeated here. The brake caliper 4 is used to convert the hydraulic pressure of the main brake unit 2 or the backup brake unit 3 into the braking force of the tire.

[0025] The main brake unit 2 includes a first oil pipe 210 and a second oil pipe 220. The first oil pipe 210 is provided with a test valve 211, a simulation chamber 212 and a simulation chamber isolation valve 213 in sequence. The simulation chamber 212 is connected to a brake pedal 214. The test valve 211 is provided with a bypass check valve 218. A simulation chamber pressure sensor 215 is connected between the simulation chamber 212 and the simulation chamber isolation valve 213. A simulation valve 216 and a pedal feel simulator 217 are connected between the simulation chamber pressure sensor 215 and the simulation chamber isolation valve 213. A travel sensor 219 is connected to the brake pedal 214. Among them, the stroke sensor is used to sense the changes in the formation of the brake pedal 214 and identify the driver's braking intention. The test valve 211 is used to detect circuit leakage when the motor is reversely boosted. The simulation chamber 212 is used to ensure mechanical redundant backup. The simulation chamber pressure sensor 215 is used to detect the real-time pressure of the simulation chamber 212 and whether there is a leak. The simulation valve 216 is used to control the flow of brake fluid into the pedal feel simulator 217. The pedal feel simulator 217 is used to feedback the pedal feel to the driver. The simulation chamber isolation valve 213 is used for mechanical redundant braking. It is closed when the wire control is normal and opened when the mechanical redundant braking is performed.

[0026] The second oil pipe 220 is provided with a liquid level monitoring valve 221, a boost chamber 222 and a boost chamber isolation valve 223 in sequence. The boost chamber 222 is connected to a transmission mechanism 224, and the transmission mechanism 224 is connected to a motor 225. The motor 225 is connected to a motor zero position sensor 226 and a motor current sensor 227. A boost chamber pressure sensor 228 is connected between the boost chamber 222 and the boost chamber isolation valve 223. The liquid level detection valve is used to detect whether the liquid level of the oil pot 1 is normal. The motor 225 and the transmission mechanism 224 cooperate to measure the numerical braking pressure in the boost chamber 222, which is transmitted to the brake caliper 4 through the oil circuit. The motor zero position sensor 226 is used to monitor the motor zero position state. The motor current sensor 227 is used to monitor the motor current state. The boost chamber pressure sensor 228 is used to detect the real-time pressure of the boost chamber 222 and whether there is leakage. The boost isolation valve is used for wire control braking, which is opened when conventional wire control is used and closed when mechanical redundant braking is used.

[0027] The first oil pipe 210 and the second oil pipe 220 are connected through a connecting pipe 230. A circuit isolation valve 231 is provided on the connecting pipe 230. The circuit isolation valve 231 is used to identify a failed circuit and close it.

[0028] Working principle: During wire control braking, the driver steps on the brake pedal 214, the test valve 211 is closed, the pedal feel simulation valve 216 is powered on and opened, the simulation chamber isolation valve 213 is powered on and closed, the circuit isolation valve 231 is opened, the liquid level monitoring valve 221 is closed, and the boost chamber isolation valve 223 is powered on and opened. The brake pressure generated by the simulation chamber 212 is isolated by the simulation chamber isolation valve 213, and the driver's brake feel is fed back by the pedal feel simulator 217. The driver's braking intention is sensed by the stroke sensor or the automatic driving system, and the motor 225 and the transmission mechanism 224 build up pressure in the boost chamber 222 to the target pressure according to the driver's intention. It enters the backup brake unit 3 through two circuits via the boost chamber isolation valve 223 and the circuit isolation valve 231, and then enters the brake caliper 4.

[0029] Redundant braking: When the main brake unit 2 fails completely, the backup brake unit 3 is activated, and the backup brake unit 3 senses the driver's braking intention through the travel sensor or the automatic driving system. When there is a braking intention, the test valve 211 is closed, the pedal feel simulation valve 216 is powered on and opened, the simulation chamber isolation valve 213 is powered on and closed, the circuit isolation valve 231 is opened, the liquid level monitoring valve 221 is closed, and the boost chamber isolation valve 223 is closed. The braking pressure generated by the simulation chamber 212 is isolated by the simulation chamber isolation valve 213, and the pedal feel simulator 217 feeds back the driver's braking foot feel. The backup brake unit 3 builds pressure by obtaining the driver's braking intention and replenishes the brake fluid through the one-way valve 5.

[0030] Mechanical brake: When both the main brake unit 2 and the backup brake unit 3 fail, and the driver intends to brake, the test valve 211 is closed, the pedal detects that the simulation valve 216 is closed, the simulation chamber isolation valve 213 is opened, the circuit isolation valve 231 is opened, the liquid level monitoring valve 221 is closed, and the boost chamber isolation valve 223 is closed. The brake pressure depends entirely on the pressure in the simulation chamber 212. It passes through the simulation chamber isolation valve 213 and the circuit isolation valve 231 through two circuits into the backup brake unit 3 and then into the brake caliper 4. If the FR-RL circuit fails, close the circuit isolation valve 231 to ensure normal pressure buildup in the FL-RR circuit.

[0031] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A hydraulic decoupling brake control booster, characterized in that: include: The main brake unit includes a first oil pipe and a second oil pipe, the first oil pipe is sequentially provided with a test valve, a simulation chamber and a simulation chamber isolation valve, the simulation chamber is connected to a brake pedal, the second oil pipe is sequentially provided with a liquid level monitoring valve, a boost chamber and a boost chamber isolation valve, the boost chamber is connected to a transmission mechanism, and the transmission mechanism is connected to a motor.

2. A hydraulic decoupling brake control booster according to claim 1, characterized in that: The test valve is provided with a bypass one-way valve.

3. A hydraulic decoupling brake control booster according to claim 1, characterized in that: A simulation chamber pressure sensor is connected between the simulation chamber and the simulation chamber isolation valve.

4. A hydraulic decoupling brake control booster according to claim 3, characterized in that: A simulation valve and a pedal feeling simulator are connected between the simulation chamber pressure sensor and the simulation chamber isolation valve.

5. The hydraulic decoupling brake control booster according to claim 1, characterized in that: The brake pedal is connected with a travel sensor.

6. The hydraulic decoupling brake control booster according to claim 1, characterized in that: The motor is connected with a motor zero position sensor and a motor current sensor.

7. The hydraulic decoupling brake control booster according to claim 1, characterized in that: A boost chamber pressure sensor is connected between the boost chamber and the boost chamber isolation valve.

8. The hydraulic decoupling brake control booster according to claim 1, characterized in that: The first oil pipe and the second oil pipe are connected through a connecting pipe.

9. A hydraulic decoupling brake control booster according to claim 8, characterized in that: A loop isolation valve is arranged on the connecting pipe.

10. The hydraulic decoupling brake control booster according to claim 1, characterized in that: It also includes an oil pot, a backup brake unit and a brake caliper, the main brake unit is connected to the oil pot through an oil pipe, the backup brake unit is connected to the active brake unit through an oil pipe, the backup brake unit is connected to the oil pot through an oil pipe with a one-way valve, and the brake caliper is connected to the backup brake unit through an oil pipe.

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