A commercial vehicle automatic parking brake system and a commercial vehicle

Abstract

The utility model discloses a kind of commercial vehicle automatic parking brake system and commercial vehicle, comprising: the gas source interface of hand brake valve is connected to air cylinder, the gas source interface of the air outlet of hand brake valve is connected to parking valve module;Pressure switch is arranged on the pipeline of the air outlet of connecting the hand brake valve and the gas source interface of the parking valve module, and with the controller VCU electrically connected;Emergency manual switch gas source interface connects the air cylinder, the air outlet of emergency manual switch is connected to the control port of the parking valve module;The air outlet of parking valve module is connected to the brake chamber, and the parking valve module is also electrically connected with the controller VCU.The utility model improves the gas circuit of traditional brake system, and the degree of integration is high, brake system pipeline connection is simple, can realize except conventional parking brake, hill start, temporary parking, automatic parking and other functions, and improve system security.

Description

Technical Field

[0001] This utility model relates to the field of commercial vehicle braking technology, specifically, to an automatic parking brake system for commercial vehicles and a commercial vehicle. Background Technology

[0002] The parking brake system used in commercial vehicles is a spring-loaded brake, which works by cutting off the air supply to the brake chamber through the handbrake valve, thereby achieving parking braking. In actual use, parking failures due to drivers forgetting to engage the handbrake or the handbrake valve automatically retracting are common, seriously endangering lives.

[0003] In existing technologies, such as CN208360151U, an electronic parking brake solution is disclosed. However, it uses multiple valve bodies and sensors, resulting in a complex system layout, high cost, and difficulty in guaranteeing reliability. Therefore, it is necessary to provide a parking brake system that is simple in structure, highly integrated, fully functional, and safe and reliable. Utility Model Content

[0004] The purpose of this invention is to provide an automatic parking brake system for commercial vehicles and a commercial vehicle, so as to solve the problems of system complexity, low reliability and single function in the prior art.

[0005] The present invention solves the above problems through the following technical solution:

[0006] An automatic parking brake system for commercial vehicles includes: an air reservoir, a pressure switch, a handbrake valve, a parking valve module, a controller (VCU), a brake chamber, and an emergency manual switch; the air supply interface of the handbrake valve is connected to the air reservoir, and the air outlet of the handbrake valve is connected to the air supply interface of the parking valve module; the pressure switch is disposed on the pipeline connecting the air outlet of the handbrake valve and the air supply interface of the parking valve module, and is electrically connected to the controller (VCU); the air supply interface of the emergency manual switch is connected to the air reservoir, and the air outlet of the emergency manual switch is connected to the control port of the parking valve module; the air outlet of the parking valve module is connected to the brake chamber, and the parking valve module is also electrically connected to the controller (VCU).

[0007] As a further improvement of this utility model, the parking valve module includes: a valve body and normally open solenoid valve A, normally open solenoid valve B, pressure control valve C and pressure sensor D integrated in the valve body; the control terminals of normally open solenoid valve A and normally open solenoid valve B are both electrically connected to the controller VCU; the pressure sensor D is disposed in the air outlet pipeline of the parking valve module and is electrically connected to the controller VCU.

[0008] As a further improvement of this utility model, the pressure control valve C is a relay valve 8, which includes an air source interface, an air outlet, an exhaust port and a control port. Its air source interface is connected to the air source interface of the parking valve module, its air outlet is connected to the air outlet of the parking valve module, and its control port is connected to the air outlet of the normally open solenoid valve A and the air source interface of the normally open solenoid valve B through internal pipelines.

[0009] As a further improvement of this utility model, the valve body of the parking valve module is also provided with a bypass pipeline. One end of the bypass pipeline is connected to the intersection of the control port pipeline of the pressure control valve C, the air outlet of the normally open solenoid valve A, and the air source interface of the normally open solenoid valve B, and the other end is connected to the air outlet pipeline of the pressure control valve C or the air outlet pipeline of the parking valve module.

[0010] As a further improvement of this utility model, the air source interface of the normally open solenoid valve A is connected to the air source interface of the parking valve module.

[0011] As a further improvement of this utility model, the emergency manual switch is a normally open manual valve.

[0012] As a further improvement of this utility model, the brake chamber is a dual-chamber brake chamber, including a service brake chamber and a spring-energy-storing parking brake chamber; the air outlet of the parking valve module is connected to the spring-energy-storing parking brake chamber.

[0013] As a further improvement of this utility model, the controller VCU is also electrically connected to a slope sensor for detecting vehicle slope, a brake pedal opening sensor for detecting brake pedal travel, and a vehicle speed sensor for detecting vehicle speed.

[0014] As a further improvement of this utility model, the brake chamber includes a left brake chamber and a right brake chamber, and the parking valve module is provided with two air outlets, which are respectively connected to the left brake chamber and the right brake chamber.

[0015] Furthermore, this utility model also solves the above problems through the following technical solutions:

[0016] A commercial vehicle is equipped with an automatic parking brake system as described above.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0018] (1) This utility model improves the air circuit of the traditional braking system, has a high degree of integration, and the connection of the braking system pipeline is simple. In addition to the conventional parking brake, it can realize functions such as hill start, temporary parking, and automatic parking, and improve the safety of the system.

[0019] (2) By introducing a controller VCU and a pressure switch, the system can automatically sense the driver's intention and control the parking valve module to perform parking or release parking, fundamentally avoiding safety accidents caused by human forgetfulness or handbrake valve failure. When the vehicle is powered off, the system automatically enters the parking state through the normally open characteristic of the normally open solenoid valve A, achieving fault safety.

[0020] (3) This utility model highly integrates normally open solenoid valve A, normally open solenoid valve B, pressure control valve C, and pressure sensor D into a single parking valve module, significantly reducing external pipelines and connection points, resulting in a compact structure and fundamentally reducing leakage risk and system failure rate. Utilizing the real-time feedback from pressure sensor D, the controller VCU can dynamically control the on / off state of solenoid valve A, accurately maintaining brake chamber pressure and effectively compensating for pipeline leakage. A bypass pipeline and emergency manual switch are provided to forcibly release the parking valve even in the event of a fault in pressure control valve C or a complete vehicle power outage, ensuring system availability. Attached Figure Description

[0021] Figure 1 This is a connection diagram of an existing parking brake system;

[0022] Figure 2 This is a connection diagram of an automatic parking brake system for commercial vehicles according to the present invention.

[0023] Figure label:

[0024] 1. Air reservoir; 2. Pressure switch; 3. Handbrake valve; 4. Parking valve module; 41. Normally open solenoid valve A; 42. Normally open solenoid valve B; 43. Pressure control valve C; 44. Pressure sensor D; 5. Controller VCU; 6. Brake chamber; 61. Left brake chamber; 62. Right brake chamber; 7. Emergency manual switch; 8. Relay valve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Explanation of relevant terms:

[0027] Relay valve: has one control port (4 ports), one air source interface (1 port), two air outlet ports (2 ports), and one exhaust port (3 ports).

[0028] Air receiver: Stores compressed air. The air source is provided by an air compressor, dried by a dryer, and then injected into the air receiver. This part is a common technology in the industry and will not be explained in detail.

[0029] Parking valve module: It has one air source interface, one control port, two air outlets, and one exhaust port.

[0030] It has two built-in normally open solenoid valves. When the solenoid valves are energized, the pipeline is open; when the solenoid valves are de-energized, the pipeline is closed. At the same time, a pressure sensor is built into the air outlet to monitor the air pressure changes at the outlet in real time.

[0031] Handbrake valve: It has one air supply port, one air outlet, and one exhaust port.

[0032] Brake chamber: In this case, the brake chamber refers to a dual-chamber brake chamber, which includes a left brake chamber and a right brake chamber. When compressed air is introduced into the spring chamber, the parking brake is released; when the compressed air is emptied from the spring chamber, the parking brake is activated.

[0033] The conventional solution for existing parking brake systems is as follows:

[0034] See attached document Figure 1 It includes only: handbrake valve 3, air tank 1, relay valve 8 and brake chamber 6; the air source interface of the handbrake valve is connected to the air tank, the air outlet of the handbrake valve is connected to the control port of the relay valve, and the exhaust port of the handbrake valve is open to the atmosphere; the air source interface of the relay valve is connected to the air source, the air outlet of the relay valve is connected to the spring chamber of the left and right brake chambers, and the exhaust port of the relay valve is open to the atmosphere.

[0035] Driving status: The handbrake is in the released state. The air source interface of the handbrake valve is connected to the air outlet of the relay valve. Compressed air in the air tank reaches the control port of the relay valve through the handbrake valve, thereby controlling the relay valve to supply air to the air outlet of the relay valve through its air source interface, and releasing the parking brake.

[0036] Parking status: When the handbrake is engaged, the compressed air in the pipeline between the handbrake valve outlet and the relay valve control port is discharged into the atmosphere through the handbrake valve exhaust port. When there is no compressed air in the relay valve control port, the air source interface of the relay valve is disconnected from the outlet, and the air in the brake chamber is emptied from the outlet of the relay valve, thus parking the vehicle.

[0037] Example 1:

[0038] Combined with appendix Figure 2As shown, an automatic parking brake system for commercial vehicles comprises an air reservoir, an emergency manual switch, a parking valve module, a controller VCU, a handbrake valve, and a pressure switch. The air supply interface of the handbrake valve 3 is connected to the air reservoir 1, and the air outlet of the handbrake valve 3 is connected to the air supply interface of the parking valve module 4. The pressure switch 2 is installed on the pipeline connecting the air outlet of the handbrake valve 3 and the air supply interface of the parking valve module 4, and is electrically connected to the controller VCU 5. The air supply interface of the emergency manual switch 7 is connected to the air reservoir 1, and the air outlet of the emergency manual switch 7 is connected to the control port of the parking valve module 4. The air outlet of the parking valve module 4 is connected to the brake chamber 6, and the parking valve module 4 is electrically connected to the controller VCU 5.

[0039] In an optional embodiment, the parking valve module 4 includes: a valve body and normally open solenoid valves A41, B42, C43, and D44 integrated within the valve body; the control terminals of normally open solenoid valves A41 and B42 are both electrically connected to the controller VCU5; the pressure sensor D44 is disposed in the air outlet pipeline of the parking valve module 4 and is electrically connected to the controller VCU5.

[0040] The pressure control valve C43 is a relay valve. Its air source interface, C1, is connected to the air source interface of the parking valve module 4. Its air outlet, C2, is connected to the air outlets 21 and 22 of the parking valve module 4. Its control port, C4, is connected to the air outlet of the normally open solenoid valve A41 and the air source interface of the normally open solenoid valve B42 through internal pipelines.

[0041] The parking valve module 4 also has a bypass pipe C3 inside its valve body. One end of the bypass pipe C3 is connected to the junction of the control port pipe of the pressure control valve C43, the air outlet of the normally open solenoid valve A41, and the air source interface of the normally open solenoid valve B42. The other end is connected to the air outlet pipe of the pressure control valve C43 or the air outlet pipe of the parking valve module 4. The air source interface of the normally open solenoid valve A41 is connected to the air source interface of the parking valve module 4.

[0042] As a preferred option, the emergency manual switch 7 is a normally open manual valve.

[0043] The brake chamber 6 is a dual-chamber brake chamber, including a service brake chamber and a spring-energy-storage parking brake chamber; the air outlet of the parking valve module 4 is connected to the spring-energy-storage parking brake chamber.

[0044] The controller VCU5 is also electrically connected to a slope sensor for detecting vehicle gradient, a brake pedal opening sensor for detecting brake pedal travel, and a vehicle speed sensor for detecting vehicle speed.

[0045] In a further technical solution, the brake chamber 6 includes a left brake chamber 61 and a right brake chamber 62. The parking valve module 4 is provided with two air outlets, which are respectively connected to the left brake chamber and the right brake chamber.

[0046] The functions of each component are as follows:

[0047] The handbrake valve is used to receive commands from the driver to park or release the parking brake. It is usually a manual mechanical valve that changes the air circuit's on / off state by the displacement of the valve core.

[0048] The air reservoir, as the power source of the system, is used to store dried and compressed air, providing a stable and clean compressed gas supply for the entire parking brake system.

[0049] The emergency manual switch is used to manually supply compressed air into a specific passage of the parking valve module to forcibly release the parking brake in emergency scenarios such as when the conventional circuit or control system fails, such as when the vehicle loses power or the VCU malfunctions. This is suitable for towing and other emergency situations.

[0050] A pressure switch is installed on the pipeline between the handbrake valve and the parking valve module. It is used to detect the presence of air pressure in this critical pipeline and convert this air pressure signal into an electrical signal, which is then transmitted to the controller VCU.

[0051] The controller VCU serves as the core of the system's intelligent processing and control. It receives signals from the pressure switch, pressure sensor D, slope sensor, brake pedal opening sensor, and vehicle speed sensor, and controls the opening and closing of normally open solenoid valves A and B.

[0052] The brake chamber, as the final actuator, is typically a spring-energized brake chamber. When compressed air is introduced into it, it overcomes the spring force and releases the parking brake; when the compressed air is expelled, it pushes the braking mechanism to apply the parking brake under the action of the spring.

[0053] The parking valve module, as the core actuator of the system, is a multifunctional integrated valve block that integrates multiple pneumatic and electronic components. Based on the instructions of the controller VCU, it precisely controls the air path to the brake chamber, thereby applying and releasing the parking brake.

[0054] In one specific embodiment, refer to the appendix. Figure 2The normally open solenoid valve A of the parking valve module is controlled by pins V1 and V2 of the controller VCU, and the normally open solenoid valve B is controlled by pins V1 and V3 of the controller VCU. The pressure sensor D feeds back the outlet pressure of the parking valve module to the controller VCU in real time. The A2 port of normally open solenoid valve A, the B1 port of normally open solenoid valve B, and the C4 port of pressure control valve C are connected to each other. The above parts can be interconnected with the pipeline C2 and the outlet pipeline of the parking valve module through the bypass pipeline C3 of pressure control valve C.

[0055] The air supply interface of the handbrake valve is connected to the air tank, and the air outlet of the handbrake valve is connected to the air supply interface of the parking valve module. A pressure switch is installed in the pipeline, and the pressure switch signal is transmitted to the V5 pin of the controller VCU to monitor the pipeline pressure change in real time.

[0056] The emergency manual switch is normally open and can only be manually adjusted to the closed state when needed. Its air source interface is connected to the air tank, and its air outlet is connected to the control port of the parking valve module.

[0057] When the vehicle is in motion: When the handbrake is released, the air supply interface of the handbrake valve connects to its outlet. The pressure switch transmits a pressure change signal to the controller VCU. The controller VCU controls the normally open solenoid valve A to open, establishing pressure at port C4 of the pressure control valve C. This opens the pressure control valve C, connecting ports C1 and C2. Compressed air flows through the parking valve module along the air supply interface, ports C1 and C2, and then to the left and right brake chambers, releasing the parking brake. Simultaneously, the pressure sensor D transmits the pipeline pressure to the controller VCU. The controller VCU detects that the pipeline pressure has reached a predetermined value and disconnects the normally open solenoid valve A. If the pipeline pressure decreases due to leaks or other reasons, the controller VCU re-opens the normally open solenoid valve A, thus dynamically adjusting the brake chamber pressure. If the pressure control valve C malfunctions, the compressed air at port C4 can reach the left and right brake chambers via the bypass pipeline C3, releasing the parking brake. At the same time, the pressure change can still be detected by the pressure sensor D, allowing for real-time control of the solenoid valve A to dynamically adjust the brake chamber pressure.

[0058] When the vehicle is in parking mode: When the handbrake is engaged, the air supply interface and air outlet of the handbrake valve are disconnected. The compressed gas from the air outlet of the parking valve module to the air supply interface of the parking valve module is discharged through the exhaust port of the parking module. The pressure switch transmits the pressure change signal to the controller VCU. The controller VCU controls the solenoid valve B to open. The gas at port C4 is discharged through the exhaust port of the solenoid valve B. The pressure control valve C is reset. The compressed gas in the brake chamber is discharged through the exhaust port of the parking valve module via C2, thus realizing parking braking.

[0059] Emergency state: The emergency manual switch is normally open. When the vehicle breaks down and needs to be towed, the manual switch is turned on. Compressed air in the air tank enters the air outlet and brake chamber through the control port of the parking valve module and the bypass pipe C3 inside the parking valve module, so as to manually release the parking brake.

[0060] Hill start function: The controller VCU receives the slope signal from the vehicle and implements the parking function with reference to the parking state. When the vehicle starts, the parking is released with a delay, thus enabling the hill start function.

[0061] Temporary parking function: When you need to temporarily stop, such as when waiting at a traffic light, you do not need to pull the handbrake. The controller VCU detects the brake pedal opening signal and vehicle speed signal and automatically realizes the parking function.

[0062] When the driver leaves, the handbrake valve becomes ineffective because solenoid valve A inside the parking valve is normally open, and the vehicle is in a parked state.

[0063] Emergency Braking: When the main brake fails, this system acts as an emergency brake. At this time, the vehicle is in motion. When the emergency switch is operated, the normally open solenoid valve B is opened, the air chamber pressure decreases, and the parking brake is activated. At the same time, the system monitors wheel speed and changes in air pressure in the pipeline in real time. If the system detects that the wheels are about to lock up, the normally open solenoid valve B is opened and the normally open solenoid valve A is opened, increasing the pressure in the pipeline and reducing the parking brake strength. Through this process, the parking force is adjusted in real time to achieve safe stopping and avoid the dangers caused by wheel lock-up.

[0064] When the vehicle is parked and the driver leaves, the vehicle is in a state of power failure. Even if the handbrake valve malfunctions, the vehicle can still remain parked, avoiding the dangers caused by the driver forgetting to engage the handbrake or by a malfunctioning handbrake.

[0065] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. An automatic parking brake system for commercial vehicles, characterized in that, include: The system includes an air reservoir, a pressure switch, a handbrake valve, a parking valve module, a controller (VCU), a brake chamber, and an emergency manual switch. The handbrake valve's air supply interface is connected to the air reservoir, and its outlet is connected to the parking valve module's air supply interface. The pressure switch is located on the pipeline connecting the handbrake valve's outlet to the parking valve module's air supply interface and is electrically connected to the controller (VCU). The emergency manual switch's air supply interface is connected to the air reservoir, and its outlet is connected to the parking valve module's control port. The parking valve module's outlet is connected to the brake chamber, and the parking valve module is also electrically connected to the controller (VCU).

2. The automatic parking brake system for commercial vehicles according to claim 1, characterized in that, The parking valve module includes: a valve body and normally open solenoid valve A, normally open solenoid valve B, pressure control valve C and pressure sensor D integrated within the valve body; The control terminals of normally open solenoid valves A and B are both electrically connected to the controller VCU; the pressure sensor D is installed in the air outlet pipeline of the parking valve module and is electrically connected to the controller VCU.

3. The automatic parking brake system for commercial vehicles according to claim 2, characterized in that, The pressure control valve C is a relay valve, including an air source interface, an air outlet, an exhaust port, and a control port. Its air source interface is connected to the air source interface of the parking valve module, its air outlet is connected to the air outlet of the parking valve module, and its control port is connected to the air outlet of the normally open solenoid valve A and the air source interface of the normally open solenoid valve B through internal pipelines.

4. The automatic parking brake system for commercial vehicles according to claim 3, characterized in that, The parking valve module also has a bypass pipeline inside its valve body. One end of the bypass pipeline is connected to the junction of the control port pipeline of the pressure control valve C, the air outlet of the normally open solenoid valve A, and the air source interface of the normally open solenoid valve B. The other end is connected to the air outlet pipeline of the pressure control valve C or the air outlet pipeline of the parking valve module.

5. The automatic parking brake system for commercial vehicles according to claim 2, characterized in that, The air supply interface of the normally open solenoid valve A is connected to the air supply interface of the parking valve module.

6. The automatic parking brake system for commercial vehicles according to claim 1, characterized in that, The emergency manual switch is a normally open manual valve.

7. The automatic parking brake system for commercial vehicles according to claim 1, characterized in that, The brake chamber is a dual-chamber brake chamber, including a service brake chamber and a spring-energy-storage parking brake chamber; the air outlet of the parking valve module is connected to the spring-energy-storage parking brake chamber.

8. A commercial vehicle automatic parking brake system according to any one of claims 1-7, characterized in that, The controller VCU is also electrically connected to a slope sensor for detecting vehicle slope, a brake pedal opening sensor for detecting brake pedal travel, and a vehicle speed sensor for detecting vehicle speed.

9. A commercial vehicle automatic parking brake system according to any one of claims 1-7, characterized in that, The brake chambers include a left brake chamber and a right brake chamber. The parking valve module has two air outlets, which are connected to the left brake chamber and the right brake chamber respectively.

10. A commercial vehicle, characterized in that, The vehicle is equipped with an automatic parking brake system as described in any one of claims 1-9.

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