Parking braking system with redundancy control function

Abstract

The parking braking system comprises a system body, and the system body comprises an air cylinder, a vehicle control unit, an EPB module, a first two-position two-way electromagnetic valve, a second two-position two-way electromagnetic valve, a braking air chamber, a tire, an air pressure switch, a relay valve, a third two-position two-way electromagnetic valve, a fourth two-position three-way electromagnetic valve and the redundancy control. In the actual operation process of the unmanned vehicle, if the EPB electrical appliance breaks down, redundancy control of the vehicle plays a role, the risk that the whole vehicle loses the parking control capacity is avoided, and therefore safety accidents are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of parking brakes, and more specifically, to a parking brake system with redundant control. Background Art

[0002] The EPB (Electrical Park Brake) electronic parking system is an automotive parking system based on electronic signal control. It can send instructions to the execution module through the controller, and the execution module realizes vehicle parking and parking release by opening and closing the combined solenoid valve. When the EPB system is used in driverless vehicles, if there is an EPB electrical failure, there will be a risk of the entire vehicle losing the parking operation ability, which may cause safety accidents. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention is solved by the following technical solutions.

[0004] A parking brake system with redundant control includes a system body, which includes an air storage tank, a vehicle controller, an EPB module, a first two-way two-position solenoid valve, a second two-way two-position solenoid valve, a brake chamber, a tire, a pressure switch, a relay valve, a third two-way two-position solenoid valve, and a two-way three-position solenoid valve; During default parking and parking release, the vehicle controller obtains vehicle message information and sends it to the EPB module. The EPB module receives the message information and issues a corresponding parking instruction or a parking release instruction. During a parking instruction, the second two-way two-position solenoid valve, the relay valve, and the brake chamber act. During a parking release instruction, the first two-way two-position solenoid valve, the air storage tank, the relay valve, and the brake chamber act; During a redundant control parking instruction, the third two-way two-position solenoid valve, the relay valve, the two-way three-position solenoid valve, and the brake chamber act. During a redundant control parking release instruction, the third two-way two-position solenoid valve, the air storage tank, the relay valve, the brake chamber, and the two-way three-position solenoid valve act.

[0005] As a preferred solution of the present invention, during default parking, the vehicle controller obtains vehicle message information and sends parking information to the EPB module. The EPB module controls the intake port and the outlet port of the second two-way two-position solenoid valve to conduct. At this time, the compressed air in the control chamber of the relay valve is discharged through the intake port, the outlet port of the second two-way two-position solenoid valve, and the exhaust port of the relay valve. The control chamber of the relay valve is depressurized, the outlet port and the exhaust port of the relay valve are conducted, and the compressed air in the parking chamber of the brake chamber is discharged to the atmosphere through the outlet port and the exhaust port of the relay valve. The compressed spring in the brake chamber pushes the push rod of the brake chamber to drive the brake to generate parking braking force.

[0006] As a preferred solution of the present invention, when parking is released by default, the vehicle controller obtains the vehicle message information and sends the parking release information to the EPB module. The EPB module controls the air inlet and air outlet of the first two-position two-way solenoid valve to be connected. At this time, the compressed air in the air reservoir enters the control chamber of the relay valve through the air inlet and air outlet of the first two-position two-way solenoid valve. The piston of the control chamber moves downward to connect the air inlet and air outlet of the relay valve. The compressed air in the air reservoir reaches the parking chamber of the brake air chamber through the air inlet and air outlet of the relay valve. The compressed air in the parking chamber causes the compression spring to release the parking braking force.

[0007] As a preferred solution of the present invention, when the redundant control system controls parking, the vehicle controller controls the air inlet and air outlet of the third two-position two-way solenoid valve to be connected. At this time, the control chamber of the relay valve and the compressed air in the pipeline are discharged into the atmosphere through the air inlet and exhaust port of the third two-position two-way solenoid valve and the air outlet and exhaust port of the two-position three-way solenoid valve in sequence; the control chamber of the relay valve is depressurized, the air outlet and exhaust port of the relay valve are connected, and the compressed air in the brake air chamber is discharged to the atmosphere through the air outlet and exhaust port of the relay valve, and the compression spring in the brake air chamber pushes the brake air chamber push rod, driving the brake to generate parking braking force.

[0008] As a preferred embodiment of the present invention, when the redundant control system controls the parking release process, the vehicle controller controls the inlet and outlet of the third two-position two-way solenoid valve to be open, while simultaneously reversing the direction of the two-position three-way solenoid valve to open its inlet and outlet. At this point, compressed air in the air reservoir sequentially passes through the inlet and outlet of the two-position three-way solenoid valve, and the inlet and outlet of the third two-position two-way solenoid valve enter the control chamber of the relay valve. The downward movement of the control chamber piston opens the inlet and outlet of the relay valve, and the compressed air in the air reservoir passes through the inlet and outlet of the relay valve to the parking chamber of the brake air chamber. The compressed air in the parking chamber compresses the compression spring, releasing the parking brake force.

[0009] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, when the EPB system is operating normally, the EPB module can receive the message information sent by the vehicle controller to make corresponding parking instructions or release instructions, and control the corresponding parts to complete the parking and release actions of the vehicle; when the EPB system is operating abnormally, the redundant control takes effect. When parking, the third two-position two-way solenoid valve, the relay valve, the two-position three-way solenoid valve, and the brake air chamber can be controlled to move to complete the parking action of the vehicle. When releasing the parking, the third two-position two-way solenoid valve, the air cylinder, the relay valve, the brake air chamber, and the two-position three-way solenoid valve can be controlled to move to complete the release action of the vehicle; through the above, during the actual operation of the unmanned vehicle, if the EPB electrical appliance fails, the redundant control of the vehicle takes effect, avoiding the risk of the vehicle losing the parking control ability, thereby avoiding the occurrence of safety accidents. Brief Description of the Drawings

[0010] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0011] Figure 1 It is a schematic diagram of the control principle of the system body in the present invention.

[0012] The names of the parts referred to by the numeral labels in the drawings are as follows: 1. Air storage tank; 2. Vehicle controller; 3. First two-position two-way solenoid valve; 4. Second two-position two-way solenoid valve; 5. Brake chamber; 6. Tire; 7. Pressure switch; 8. Relay valve; 9. Third two-position two-way solenoid valve; 10. Two-position three-way solenoid valve. Detailed Description of the Embodiments

[0013] To further understand the content of the present invention, the present invention will be described in detail in combination with the drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and not for limiting it. Embodiment

[0014] As Figure 1 shown, this embodiment provides a parking brake system with redundant control, which includes a system body. The system body includes an air storage tank 1, a vehicle controller 2, an EPB module, a first two-position two-way solenoid valve 3, a second two-position two-way solenoid valve 4, a brake chamber 5, a tire 6, a pressure switch 7, a relay valve 8, a third two-position two-way solenoid valve 9, and a two-position three-way solenoid valve 10; When default parking and releasing parking, the vehicle controller 2 obtains vehicle message information and sends it to the EPB module. The EPB module receives the message information and makes corresponding parking instructions or releasing parking instructions. When receiving a parking instruction, the second two-position two-way solenoid valve 4, the relay valve 8, and the brake chamber 5 act. When receiving a releasing parking instruction, the first two-position two-way solenoid valve 3, the air storage tank 1, the relay valve 8, and the brake chamber 5 act; When receiving a redundant control parking instruction, the third two-position two-way solenoid valve 9, the relay valve 8, the two-position three-way solenoid valve 10, and the brake chamber 5 act. When receiving a redundant control releasing parking instruction, the third two-position two-way solenoid valve 9, the air storage tank 1, the relay valve 8, the brake chamber 5, and the two-position three-way solenoid valve 10 act.

[0015] In this embodiment, when the EPB system operates normally, the EPB module can receive the message information sent from the vehicle controller 2 to make corresponding parking commands or parking release commands, and control the corresponding parts to act, completing the parking and parking release actions of the vehicle; when the EPB system operates abnormally, redundant control comes into play. When parking, it can control the third two-way two-way solenoid valve 9, relay valve 8, two-way three-way solenoid valve 10, and brake chamber 5 to act to complete the parking action of the vehicle. When releasing the parking, it can control the third two-way two-way solenoid valve 9, air storage tank 1, relay valve 8, brake chamber 5, and two-way three-way solenoid valve 10 to act to complete the parking release action of the vehicle. Through the above, during the actual operation of the driverless vehicle, if there is an EPB electrical fault, the redundant control of the vehicle comes into play, avoiding the risk of the whole vehicle losing the parking operation ability, thus avoiding the occurrence of safety accidents.

[0016] Specifically, during default parking, the vehicle controller 2 obtains the vehicle message information and sends the parking information to the EPB module. The EPB module controls the intake port and outlet port of the second two-way two-way solenoid valve 4 to conduct. At this time, the compressed air in the control chamber of the relay valve 8 is discharged through the intake port, outlet port of the second two-way two-way solenoid valve 4 and the exhaust port of the relay valve 8; the control chamber of the relay valve 8 is depressurized, and the outlet port and exhaust port of the relay valve 8 are conducted. The compressed air in the parking chamber of the brake chamber 5 is discharged to the atmosphere through the outlet port and exhaust port of the relay valve 8. The compression spring in the brake chamber 5 pushes the push rod of the brake chamber 5 to drive the brake to generate parking braking force, thus realizing the parking action of the driverless vehicle when the EPB module system operates normally.

[0017] Specifically, during default parking release, the vehicle controller 2 obtains the vehicle message information and sends the parking release information to the EPB module. The EPB module controls the intake port and outlet port of the first two-way two-way solenoid valve 3 to conduct. At this time, the compressed air in the air storage tank 1 enters the control chamber of the relay valve 8 through the intake port and outlet port of the first two-way two-way solenoid valve 3. The piston in the control chamber moves downward to make the intake port and outlet port of the relay valve 8 conduct. The compressed air in the air storage tank 1 reaches the parking chamber of the brake chamber 5 through the intake port and outlet port of the relay valve 8. The compressed air in the parking chamber releases the parking braking force of the compression spring, thus realizing the parking release action of the driverless vehicle when the EPB module system operates normally.

[0018] Specifically, when the redundant control system controls parking, the vehicle controller 2 controls the air inlet and air outlet of the third two-position two-way solenoid valve 9 to be connected. At this time, the compressed air in the control chamber of the relay valve 8 and the pipeline is discharged into the atmosphere through the air inlet and exhaust port of the third two-position two-way solenoid valve 9 and the air outlet and exhaust port of the two-position three-way solenoid valve 10 in turn; the control chamber of the relay valve 8 is depressurized, the air outlet and exhaust port of the relay valve 8 are connected, and the compressed air in the brake air chamber 5 is discharged to the atmosphere through the air outlet and exhaust port of the relay valve 8. The compression spring in the brake air chamber 5 pushes the brake air chamber 5 push rod, driving the brake to generate parking braking force, thereby realizing that when the EPB module system is operating abnormally, the redundant control system controls the parking action of the unmanned vehicle.

[0019] Specifically, when the redundant control system controls the release process, the vehicle controller 2 controls the inlet and outlet of the third, two-position, two-way solenoid valve 9 to be open, while simultaneously reversing the direction of the two-position, three-way solenoid valve 10, opening the inlet and outlet of the two-position, three-way solenoid valve 10. At this point, the compressed air in the air reservoir 1 sequentially passes through the inlet and outlet of the two-position, three-way solenoid valve 10, and then enters the control chamber of the relay valve 8. The downward movement of the control chamber piston opens the inlet and outlet of the relay valve 8, and the compressed air in the air reservoir 1 reaches the parking chamber of the brake air chamber 5 through the inlet and outlet of the relay valve 8. The compressed air in the parking chamber compresses the compression spring, releasing the parking brake force. This allows the redundant control system to control the release of the unmanned vehicle's parking action when the EPB module system is not operating normally.

[0020] In short, the above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A parking brake system with redundant control, characterized in that: It includes a system body, which includes an air storage tank (1), a vehicle controller (2), an EPB module, a first two-position two-way solenoid valve (3), a second two-position two-way solenoid valve (4), a brake chamber (5), a tire (6), a pressure switch (7), a relay valve (8), a third two-position two-way solenoid valve (9), and a two-position three-way solenoid valve (10); When default parking and releasing parking, the vehicle controller (2) obtains vehicle message information and sends it to the EPB module. The EPB module receives the message information and makes corresponding parking instructions or parking release instructions. When it is a parking instruction, the second two-position two-way solenoid valve (4), the relay valve (8), and the brake chamber (5) act. When it is a parking release instruction, the first two-position two-way solenoid valve (3), the air storage tank (1), the relay valve (8), and the brake chamber (5) act; When redundant control parking instruction, the third two-position two-way solenoid valve (9), the relay valve (8), the two-position three-way solenoid valve (10), and the brake chamber (5) act. When redundant control parking release instruction, the third two-position two-way solenoid valve (9), the air storage tank (1), the relay valve (8), the brake chamber (5), and the two-position three-way solenoid valve (10) act.

2. The parking brake system with redundant control according to claim 1, characterized in that: When default parking, the vehicle controller (2) obtains vehicle message information and sends parking information to the EPB module. The EPB module controls the air inlet and outlet of the second two-position two-way solenoid valve (4) to conduct. At this time, the compressed air in the control chamber of the relay valve (8) is discharged through the air inlet and outlet of the second two-position two-way solenoid valve (4) and the exhaust port of the relay valve (8); the control chamber of the relay valve (8) is depressurized, the air outlet and exhaust port of the relay valve (8) are conducted, and the compressed air in the parking chamber of the brake chamber (5) is discharged to the atmosphere through the air outlet and exhaust port of the relay valve (8). The compressed spring in the brake chamber (5) pushes the push rod of the brake chamber (5) to drive the brake to generate parking braking force.

3. The parking brake system with redundant control according to claim 1, characterized in that: When default releasing parking, the vehicle controller (2) obtains vehicle message information and sends parking release information to the EPB module. The EPB module controls the air inlet and outlet of the first two-position two-way solenoid valve (3) to conduct. At this time, the compressed air in the air storage tank (1) enters the control chamber of the relay valve (8) through the air inlet and outlet of the first two-position two-way solenoid valve (3). The piston in the control chamber moves downward to make the air inlet and outlet of the relay valve (8) conduct. The compressed air in the air storage tank (1) reaches the parking chamber of the brake chamber (5) through the air inlet and outlet of the relay valve (8). The compressed air in the parking chamber releases the parking braking force of the compressed spring.

4. A parking brake system with redundant control according to claim 1, characterized in that: When the redundant control system controls parking, the vehicle controller (2) controls the air inlet and air outlet of the third two-position two-way solenoid valve (9) to be connected. At this time, the control chamber of the relay valve (8) and the compressed air in the pipeline are discharged into the atmosphere through the air inlet and exhaust port of the third two-position two-way solenoid valve (9) and the air outlet and exhaust port of the two-position three-way solenoid valve (10) in sequence; the control chamber of the relay valve (8) is depressurized, the air outlet and exhaust port of the relay valve (8) are connected, and the compressed air in the brake air chamber (5) is discharged into the atmosphere through the air outlet and exhaust port of the relay valve (8). The compression spring in the brake air chamber (5) pushes the brake air chamber (5) push rod, driving the brake to generate parking braking force.

5. A parking brake system with redundant control according to claim 1, characterized in that: When the redundant control system controls the release process of parking, the vehicle controller (2) controls the air inlet and outlet of the third two-position two-way solenoid valve (9) to be open, and at the same time, the two-position three-way solenoid valve (10) is reversed to open the air inlet and outlet of the two-position three-way solenoid valve (10). At this time, the compressed air in the air reservoir (1) passes through the air inlet and outlet of the two-position three-way solenoid valve (10) in sequence, and the air inlet and outlet of the third two-position two-way solenoid valve (9) enter the control chamber of the relay valve (8). The piston of the control chamber moves downward to open the air inlet and outlet of the relay valve (8). The compressed air in the air reservoir (1) reaches the parking chamber of the brake air chamber (5) through the air inlet and outlet of the relay valve (8). The compressed air in the parking chamber compresses the compression spring to release the parking brake force.

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