Electro-hydraulic integrated brake actuating mechanism and brake method

Abstract

One end of a brake disc is arranged in a brake caliper body, two friction plates are arranged on the two sides of the brake disc respectively, one friction plate is fixed to the brake caliper body, the other friction plate is fixed to a main brake piston, the brake caliper body is provided with a main cavity and a plurality of branch cavities, and the branch cavities are communicated with the main cavity. The branch cavities are communicated with the main cavity, the main brake piston is arranged in the main cavity, a driving piston is arranged in each branch cavity, a cavity between the main brake piston and the driving piston is filled with brake oil, and each driving piston is driven by an independent driving mechanism and moves in the axial direction of the main brake piston. In the emergency braking working condition, the driving mechanisms work at the same time, the response time of automobile braking can be shortened, and the braking efficiency of an automobile is improved. If one brake motor or even multiple brake motors break down, other brake motors can still complete the automobile brake function, and therefore the fault-tolerant capability and the working reliability of the brake system are improved.

Description

Technical Field

[0001] The invention relates to an electro-hydraulic integrated braking actuator and a braking method. Background Art

[0002] With the development of intelligent automobile networking technology, autonomous driving, and unmanned driving, new requirements have been put forward for automobile braking devices and their braking efficiency, response performance, and fault tolerance. It is expected that the automobile braking system will have a fast response speed, short braking time, high braking reliability, and strong fault tolerance. Electronic hydraulic braking system (EHB) and electronic mechanical braking system (EMB) are the current research hotspots and development trends of automobile braking systems. Both have their own advantages and disadvantages. How to combine EHB with EMB to improve the comprehensive braking performance of the automobile is a problem worth studying. So far, there are few references to the electro-hydraulic integrated brake actuator that combines the structural characteristics of EHB and EMB. Summary of the invention

[0003] The present invention provides an electro-hydraulic integrated brake actuator and a braking method in order to solve the problems existing in the above-mentioned prior art.

[0004] The technical solutions adopted in the present invention are: An electro-hydraulic integrated brake actuator comprises a brake disc and a brake caliper body, one end of the brake disc is placed in the brake caliper body, and also comprises a friction plate, a main brake piston and a driving piston, two friction plates are respectively arranged on both sides of the brake disc, and one friction plate is fixed to the brake caliper body, and the other friction plate is fixed to the main brake piston, a main cavity and a plurality of branch cavities are provided on the brake caliper body, the branch cavities are connected to the main cavity, the main brake piston is placed in the main cavity, a driving piston is arranged in each branch cavity, the cavity between the main brake piston and the driving piston is filled with brake oil, and each driving piston is driven by an independent driving mechanism and moves along the axial direction of the main brake piston.

[0005] Furthermore, the driving mechanism is an electric lead screw mechanism.

[0006] Furthermore, a liquid storage chamber is provided on the brake caliper body, and the liquid storage chamber is connected with a chamber filled with brake oil through a pipeline, and a solenoid valve is provided on the pipeline.

[0007] Furthermore, at least four branch cavities are provided and arranged in an array on the brake caliper body, and the branch cavities are arranged parallel to the axis of the main cavity.

[0008] Furthermore, a pressure sensor is provided on the cavity wall of the main cavity and located in the axial direction of the main brake piston.

[0009] The present invention also discloses a braking method. After the brake pedal is stepped on, one driving mechanism is actuated or multiple driving mechanisms are actuated simultaneously to drive the driving piston to move toward the main brake piston. The driving piston compresses the brake oil and realizes the synchronous movement of the main brake piston. After the friction plate fixed to the main brake piston contacts the brake disc, the friction plate fixed to the brake caliper body moves toward the brake disc and contacts the brake disc. The pressure sensor feeds back the pressure of the corresponding chamber in real time. When the pressure exceeds or falls below the set threshold range, the solenoid valve is opened to connect with the liquid storage chamber to dynamically maintain the oil pressure in the chamber within the threshold range.

[0010] The present invention has the following beneficial effects: (1) In the present invention, the driving mechanism works simultaneously during emergency braking, which can shorten the response time of vehicle braking and improve the braking efficiency of the vehicle.

[0011] (2) The present invention arranges a plurality of independently working drive pistons on one side of the brake disc. Each drive piston is independently controlled and can calculate the braking load according to the size and duration of the braking torque provided. A working mode in which different numbers of drive mechanisms are combined can be selected according to the value of the accumulated braking load.

[0012] (3) The braking torque provided by each driving mechanism is relatively small, which can improve the accuracy and performance of anti-lock braking control and braking torque control when the anti-lock braking system is working and the brake pressure is adjusted.

[0013] (4) Several independently working brake mechanisms are set up. If one or even multiple brake motors fail, the other brake motors can still complete the vehicle braking function, thereby improving the fault tolerance and working reliability of the brake system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the present invention.

[0015] Figure 2 Schematic diagram of the liquid circuit of the present invention.

[0016] Figure 3 Several arrangements of the drive pistons of the present invention are provided. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] like Figure 1 and Figure 2The present invention discloses an electro-hydraulic integrated brake actuator, comprising a brake disc 1, a brake caliper body 2, a friction plate 3, a main brake piston 4 and a driving piston 5. One end of the brake disc 1 is placed in the brake caliper body 2, two friction plates 3 are respectively arranged on both sides of the brake disc 1, and one friction plate 3 is fixed to the brake caliper body 2, and the other friction plate 3 is fixed to the main brake piston 4. A main cavity 21 and a plurality of branch cavities 22 are provided on the brake caliper body 2, and all the branch cavities 22 are connected to the main cavity 21. The main brake piston 4 is placed in the main cavity 21, and a driving piston 5 is arranged in each branch cavity 22. To ensure sealing, sealing rings are provided on the main brake piston 4 and the driving piston 5. The chamber between the main brake piston 4 and the driving piston 5 is filled with brake oil, and each driving piston 5 is driven by an independent driving mechanism and moves along the axial direction of the main brake piston 4.

[0019] The driving mechanism adopts an electric screw mechanism with high precision and stable transmission.

[0020] During use, affected by temperature, sometimes the temperature increase in the chamber will cause the pressure to increase, which will cause the main brake piston 4 to move. In order to ensure the pressure balance in the chamber where the brake oil is located, a liquid storage chamber 6 is also provided on the brake caliper body 2. The liquid storage chamber 6 is connected to the chamber filled with brake oil through a pipeline, and a solenoid valve 7 is provided on the pipeline.

[0021] A pressure sensor 8 is provided on the cavity wall of the main cavity 21 and in the axial direction of the main brake piston 4. The pressure sensor 8 is used to monitor the pressure changes in the cavity where the brake oil is located, and transmit the pressure change value to the ECU in real time, and then control the opening and closing of the solenoid valve 7 according to the pressure change to achieve dynamic balance of the brake oil.

[0022] In the present application, at least four branch chambers 22 are provided, that is, at least four independently operated driving pistons 5 are provided. The multi-piston operation can effectively avoid the phenomenon of brake failure. All the driving pistons 5 are arranged in an array on the brake caliper body 2, such as Figure 3 There are four distribution methods: abcd.

[0023] When in use, after the brake pedal is stepped on, one drive mechanism or multiple drive mechanisms are activated simultaneously. For example, when the brake is lightly pressed during smooth driving, one or two electric lead screws drive the corresponding drive piston 5. During emergency braking, all electric lead screws act simultaneously, and the drive piston 5 moves toward the main brake piston 4. The drive piston 5 compresses the brake oil and realizes the synchronous movement of the main brake piston 4. After the friction plate 3 fixed to the main brake piston 4 contacts the brake disc 1, the friction plate 3 fixed to the brake caliper body 2 moves toward the brake disc 1 and contacts the brake disc 1. The pressure sensor 8 provides real-time feedback on the pressure of the corresponding chamber. When the pressure exceeds or falls below the set threshold range, the electromagnetic valve 7 is opened to communicate with the liquid storage chamber 6 to dynamically maintain the oil pressure in the chamber within the threshold range.

[0024] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. An electro-hydraulic integrated brake actuator, comprising a brake disc (1) and a brake caliper body (2), wherein one end of the brake disc (1) is disposed in the brake caliper body (2), and characterized in that: The invention also comprises a friction plate (3), a main brake piston (4) and a driving piston (5), wherein the two friction plates (3) are respectively arranged on both sides of the brake disc (1), and one friction plate (3) is fixed to the brake caliper body (2), and the other friction plate (3) is fixed to the main brake piston (4). A main cavity (21) and a plurality of branch cavities (22) are provided on the brake caliper body (2), and the branch cavities (22) are communicated with the main cavity (21). The main brake piston (4) is arranged in the main cavity (21), and a driving piston (5) is arranged in each branch cavity (22). Brake oil is filled in the cavity between the main brake piston (4) and the driving piston (5), and each driving piston (5) is driven by an independent driving mechanism and moves along the axial direction of the main brake piston (4).

2. The electro-hydraulic integrated brake actuator according to claim 1, characterized in that: The driving mechanism is an electric lead screw mechanism.

3. The electro-hydraulic integrated brake actuator according to claim 1, characterized in that: The brake caliper body (2) is also provided with a liquid storage chamber (6), which is connected to a chamber filled with brake oil via a pipeline, and a solenoid valve (7) is provided on the pipeline.

4. The electro-hydraulic integrated brake actuator according to claim 1, characterized in that: At least four branch cavities (22) are provided and arranged in an array on the brake caliper body (2), and the axis of the branch cavities (22) and the main cavity (21) are arranged in parallel.

5. The electro-hydraulic integrated brake actuator according to claim 1, characterized in that: A pressure sensor (8) is provided on the cavity wall of the main cavity (21) and in the axial direction of the main brake piston (4).

6. A braking method for an actuator according to any one of claims 1 to 5, characterized in that: After the brake pedal is stepped on, one driving mechanism or multiple driving mechanisms are activated simultaneously, driving the driving piston (5) to move in the direction of the main brake piston (4), the driving piston (5) compresses the brake oil and realizes the synchronous movement of the main brake piston (4), after the friction plate (3) fixed to the main brake piston (4) contacts the brake disc (1), the friction plate (3) fixed to the brake caliper body (2) moves in the direction of the brake disc (1) and contacts the brake disc (1); the pressure sensor (8) feeds back the pressure of the corresponding chamber in real time, and when the pressure exceeds or falls below a set threshold range, the solenoid valve (7) is opened to communicate with the liquid storage chamber (6), so as to dynamically maintain the oil pressure in the chamber within the threshold range.

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