An epb system for a heavy goods vehicle

Abstract

The utility model provides a kind of EPB system of heavy truck, including air supply device and brake master valve, air supply device is the air supply for brake master valve;Brake master valve, fast release valve, ABS solenoid valve one and front axle brake cylinder are sequentially connected;Brake master valve, temporary stop integrated valve, rear axle brake cylinder are sequentially connected, temporary stop integrated valve is connected with second air reservoir;Rear axle brake cylinder, EPB integrated valve and third air reservoir are sequentially connected.The utility model integrates the temporary stop integrated valve by the driving valve and two ABS solenoid valves of car, and EPB controller and parking driving valve are integrated in EPB, to cancel multiple components, such as temporary parking valve, double-way check valve, parking memory valve and process control valve, greatly reduce the variety and quantity of components.This not only simplifies the structure and layout of system, reduces the complexity of system, also greatly saves development cycle and procurement cost, improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of heavy-duty truck parking brake technology, and in particular relates to an EPB system for heavy-duty trucks. Background Technology

[0002] Traditional parking brake systems mostly use mechanical handbrakes, which have a relatively complex structure and numerous parts. This not only increases manufacturing costs but also affects the vehicle's ease of operation and the stability of braking performance to some extent. With the widespread application of electronic technology in the automotive field, electronic parking brake systems (EPB) have gradually become a research and application hotspot.

[0003] Currently, an EPB control system typically includes various components such as an EPB switch, EPB controller, ABS-ECU, wheel speed sensors, front axle diaphragm cylinder, ABS solenoid valve, relay valve, master brake valve, temporary parking valve, two-way check valve, parking memory valve, process control valve, air pressure sensor, driving relay valve, parking relay valve, spring brake cylinder, air compressor, air preparation unit, air reservoir, and brake lines. Through the coordinated operation of these components, temporary braking during driving and long-term braking after parking can be achieved, replacing the traditional mechanical handbrake.

[0004] However, the existing EPB system involves a large number of different types of components and has a low degree of integration. This not only makes the system structure complex and increases the difficulty of manufacturing and assembly, but may also lead to poor coordination between components, affecting the reliability and stability of the braking system. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model aims to propose an EPB system for heavy-duty trucks, which solves the problems of a large variety and quantity of components and low integration in the EPB system.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: An EPB system for a heavy-duty truck includes an air supply device and a master brake valve. The air supply device is connected to a first air reservoir, a second air reservoir, and a third air reservoir, respectively. The air inlet of the master brake valve is connected to the first air reservoir and the second air reservoir, respectively. The air outlet of the master brake valve, the quick-release valve, the ABS solenoid valve, and the front axle brake cylinder are connected in sequence; the air outlet of the master brake valve, the control port of the temporary stop integrated valve, and the air inlet of the rear axle brake cylinder are connected in sequence, and the air inlet of the temporary stop integrated valve is connected to the second air reservoir; the air inlet of the rear axle brake cylinder, the EPB integrated valve, and the third air reservoir are connected in sequence. The temporary stop integrated valve includes a driving relay valve and two ABS solenoid valves. The EPB integrated valve includes an EPB controller and a parking relay valve. The EPB controller is electrically connected to the EPB switch, the two ABS solenoid valves, and the ABS-ECU.

[0007] Furthermore, the control port and air inlet of the temporary stop integrated valve correspond to the control port and air inlet of the travel relay valve, respectively. The air outlet of the travel relay valve is connected to the air inlets of the two ABS solenoid valves, respectively, and the air outlets of the two ABS solenoid valves correspond to the air outlets of the temporary stop integrated valve.

[0008] Furthermore, the air inlet and outlet of the EPB integrated valve correspond to the air inlet and outlet of the parking relay valve, respectively.

[0009] Furthermore, the air supply device includes an air compressor and an air handling unit. The outlet of the air compressor is connected to the air inlet of the air handling unit, and the outlet of the air handling unit is connected to the air inlets of the first air storage tank, the second air storage tank, and the third air storage tank, respectively.

[0010] Furthermore, a pressure sensor is installed on the pipeline between the rear axle brake cylinder and the temporary stop integrated valve, and the pressure sensor is electrically connected to the EPB controller.

[0011] Furthermore, the EPB system also includes wheel speed sensors mounted on the wheels of the heavy-duty truck and electrically connected to the ABS-ECU.

[0012] Furthermore, the EPB system also includes a battery for powering the EPB system.

[0013] Compared with the prior art, the EPB system for heavy-duty trucks described in this utility model has the following advantages: This invention integrates the driving relay valve and two ABS solenoid valves into a temporary stop integrated valve, and integrates the EPB controller and parking relay valve into an EPB integrated valve, thereby eliminating several components such as the temporary stop valve, two-way check valve, parking memory valve, and process control valve, significantly reducing the types and number of components. This not only simplifies the system structure and layout and reduces system complexity, but also greatly saves development time and procurement costs, and improves production efficiency and economic benefits.

[0014] This utility model's EPB system is applicable to various heavy-duty trucks, meeting the parking brake requirements of trucks of different tonnages and uses. The high degree of component integration reduces connection points and potential failure points, improving system reliability and stability, and lowering the risk of brake failure due to component malfunctions. Furthermore, the system communicates with other vehicle controllers via a CAN bus, achieving networked and intelligent control. It can monitor and assess the vehicle's driving status in real time, adjust braking strategies promptly, ensure the normal operation of the braking system, and improve the overall vehicle safety and reliability. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present utility model.

[0016] Explanation of reference numerals in the attached figures: 1. EPB switch; 2. Battery; 3. ABS-ECU; 4. Wheel speed sensor; 5. Front axle brake cylinder; 6. ABS solenoid valve 1; 7. Quick release valve; 8. Master brake valve; 9. Emergency stop integrated valve; 10. Pressure sensor; 11. EPB integrated valve; 12. Rear axle brake cylinder; 13. Air compressor; 14. Air preparation unit; 151. First air reservoir; 152. Second air reservoir; 153. Third air reservoir. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, an EPB system for a heavy-duty truck includes an air supply device and a brake master valve 8. The air supply device is connected to a first air reservoir 151, a second air reservoir 152, and a third air reservoir 153, respectively. The first air inlet and the second air inlet of the brake master valve 8 are connected to the first air reservoir 151 and the second air reservoir 152, respectively. The air outlet 1 of the master brake valve 8, the quick release valve 7, the ABS solenoid valve 6, and the front axle brake cylinder 5 are connected in sequence; the air outlet 2 of the master brake valve 8, the control port of the temporary stop integrated valve 9, and the air inlet 1 of the rear axle brake cylinder 12 are connected in sequence, and the air inlet of the temporary stop integrated valve 9 is connected to the second air reservoir 152; the air inlet 2 of the rear axle brake cylinder 12, the EPB integrated valve 11, and the third air reservoir 153 are connected in sequence.

[0022] In a preferred embodiment of the present invention, the temporary stop integrated valve 9 includes a vehicle relay valve and two ABS solenoid valves 2. The vehicle relay valve includes an air inlet, two air outlets, a control port and an exhaust port. The ABS solenoid valves 2 include an air inlet, an air outlet and an exhaust port. The control port and air inlet of the temporary stop integrated valve 9 correspond to the control port and air inlet of the travel relay valve, respectively. The air outlet of the travel relay valve is connected to the air inlets of the two ABS solenoid valves, respectively. The air outlets of the two ABS solenoid valves correspond to the air outlets of the temporary stop integrated valve 9, respectively.

[0023] Specifically, by integrating the driving relay valve and two ABS solenoid valves into the temporary stop integrated valve 9, a high degree of valve integration is achieved. This design eliminates the temporary stop valve and dual-way check valve in traditional systems, reducing the number and types of components, making the entire system structure more compact, and reducing system complexity. The integrated design of the temporary stop integrated valve 9 helps to shorten the air path length, reduce the gas transmission time and pressure loss in the pipeline, thereby making the system respond more quickly to control signals. When the EPB integrated valve 11 sends a control signal to the temporary stop integrated valve 9, the driving relay valve and ABS solenoid valves can act quickly, promptly charging or venting the front axle brake cylinder 5, thereby realizing the parking brake or release operation of the vehicle.

[0024] In a preferred embodiment of this utility model, the EPB integrated valve 11 includes an EPB controller and a parking relay valve. The air inlet and outlet of the EPB integrated valve 11 correspond to the air inlet and outlet of the parking relay valve, respectively. The EPB controller is electrically connected to the EPB switch 1 and the ABS solenoid valve 2, respectively. The EPB controller and the wheel speed sensor 4 are both electrically connected to the ABS-ECU 3.

[0025] Specifically, the EPB controller and parking relay valve are integrated into one unit, eliminating the parking memory valve and process control valve in traditional systems. The EPB controller controls the integrated EPB valve. This integrated design significantly reduces the number of parts, simplifies the system structure, reduces complexity, improves assembly efficiency, facilitates installation and maintenance, and reduces production costs. The EPB controller is electrically connected to EPB switch 1 and ABS solenoid valve 2, enabling it to quickly receive switch signals and precisely control the action of the parking relay valve, achieving rapid response of the parking brake. In emergencies, it quickly builds up braking pressure, shortens braking distance, and ensures driving safety.

[0026] In a preferred embodiment of the present invention, the air supply device includes an air compressor 13 and an air handling unit 14. The outlet of the air compressor 13 is connected to the air inlet of the air handling unit 14, and the outlet of the air handling unit 14 is connected to the air inlets of the first air storage cylinder 151, the second air storage cylinder 152, and the third air storage cylinder 153, respectively.

[0027] Specifically, the air handling unit 14 performs a series of processes on the compressed air, including drying and filtration, to remove moisture, impurities, and oil, effectively improving the purity and quality of the compressed air. The optimized compressed air extends the service life of pneumatic components in the braking system, reducing wear and malfunctions caused by impurities. It also prevents water vapor from condensing into ice at low temperatures and clogging the air passages, ensuring stable system operation under various conditions. Simultaneously, the air outlet of the air handling unit is connected to the inlets of the first air reservoir 151, the second air reservoir 152, and the third air reservoir 153, respectively, achieving a rational distribution of air supply to meet the air requirements of different parts and improving the overall system's air supply efficiency and stability.

[0028] In a preferred embodiment of this utility model, a pressure sensor 10 is provided on the pipeline between the rear axle brake cylinder 12 and the temporary stop integrated valve 9, and the pressure sensor 10 is electrically connected to the EPB controller.

[0029] Specifically, the pressure sensor 10 monitors the air pressure in the pipeline between the rear axle brake cylinder 12 and the temporary stop integrated valve 9 in real time, and converts the air pressure signal into an electrical signal before transmitting it to the EPB controller. This provides the EPB controller with accurate air pressure data, enabling it to understand the pressure status of the braking system in real time and providing an accurate basis for subsequent control decisions. For example, during parking brake or temporary stop brake operation, the EPB controller precisely controls the action of the temporary stop integrated valve 9 based on the air pressure value fed back by the pressure sensor, ensuring that the rear axle brake cylinder 12 generates appropriate braking force and achieving precise braking control.

[0030] In a preferred embodiment of the present invention, the EPB system further includes a battery for supplying power to the EPB system.

[0031] How does the EPB system work on heavy-duty trucks? When the vehicle brakes, the driver presses the brake pedal, and both the air inlet and outlet of the brake master valve 8 open. Gas flows from the first air reservoir 151 and the second air reservoir 152 through the brake master valve 8 into the quick release valve 7 and the second air inlet of the temporary stop integrated valve 9, respectively. The gas passing through the quick release valve 7 passes through the ABS solenoid valve 6 and enters the cavity of the front axle brake cylinder 5 to brake the front wheels. The gas passing through the temporary stop integrated valve 9 enters the front cavity of the rear axle brake cylinder 12 to brake the rear wheels.

[0032] When the service brake brings the vehicle from dynamic braking to static braking and holds the brake for 3 seconds, the EPB system will automatically activate the temporary parking brake. The EPB controller calculates the 3-second time based on the brake pedal switch message signal; the EPB controller then initiates the temporary stop.

[0033] When applying temporary parking brake, press and hold the brake pedal for 3 seconds or turn on the temporary parking switch of EPB switch 1 to activate the temporary parking brake. The temporary parking switch indicator light on the vehicle's instrument panel will illuminate. After receiving the signal from EPB switch 1, EPB integrated valve 11 sends a CAN signal to ABS-ECU. ABS-ECU then controls temporary parking integrated valve 9 to pressurize. Gas enters the control port of temporary parking integrated valve 9 from the second air reservoir 152 and then enters the front chamber of rear axle brake cylinder 12 through the outlet of temporary parking integrated valve 9. This pushes the diaphragm in the air chamber of rear axle brake cylinder 12, causing the push rod in the air chamber to move forward and apply force to the rear axle brake drum, thus activating the temporary parking brake. After the temporary parking brake reaches the set time, it closes and switches to parking brake.

[0034] When releasing the temporary parking brake, release the brake pedal or release the brake via EPB switch 1. The temporary parking brake will be released, and the temporary parking switch indicator light on the vehicle's instrument panel will automatically stop flashing. When the brake pedal is released, the air inlet 1 and air inlet 2 of the brake master valve 8 are closed, and the air outlet 1 and air outlet 2 stop supplying air. Compressed air in the front axle brake cylinder 5 and its corresponding air pipe is discharged into the atmosphere through the exhaust port of the brake master valve 8, and compressed air in the rear axle brake cylinder 12 and its corresponding air pipe is discharged into the atmosphere through the exhaust port of the temporary parking integrated valve 9. At this time, the temporary parking brake will be released.

[0035] When the parking brake is applied, the temporary parking brake reaches the set time or the EPB switch 1 is pulled up to the top to activate the parking brake. The parking indicator light on the vehicle instrument panel illuminates, the exhaust port of the EPB integrated valve 11 opens, and the gas in the rear axle brake cylinder 12 is released to the atmosphere through the exhaust port of the EPB integrated valve 11. The spring force in the spring brake cylinder is canceled out by the air pressure, pushing the brake piston to implement the parking brake.

[0036] When the parking brake is released, press the brake pedal and push the EPB switch 1 down. The parking indicator light on the vehicle's instrument panel will turn off. After receiving the signal from the EPB switch 1, the EPB integrated valve 11 will allow gas to flow from the third air reservoir 153 into the rear chamber of the rear axle brake cylinder 12 through the EPB integrated valve 11. When the gas in the rear chamber reaches a certain pressure, it will compress the brake spring in the rear axle brake cylinder 12. The brake spring will be pushed back, releasing the parking brake. Release the pedal, and the vehicle will start moving.

[0037] Emergency braking and release: Pulling EPB switch 1 to the top for more than 3 seconds will activate the emergency brake. After the emergency brake is activated, the parking brake will not automatically release when the vehicle starts moving. This can be achieved by pressing EPB switch down 5 times consecutively within the first 10 seconds of vehicle power-on.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An EPB system for a heavy-duty truck, comprising an air supply device and a master brake valve, wherein the air supply device is connected to a first air reservoir, a second air reservoir, and a third air reservoir respectively, and the air inlet of the master brake valve is connected to the first air reservoir and the second air reservoir respectively, characterized in that: The air outlet of the master brake valve, the quick-release valve, the ABS solenoid valve, and the front axle brake cylinder are connected in sequence; the air outlet of the master brake valve, the control port of the temporary stop integrated valve, and the air inlet of the rear axle brake cylinder are connected in sequence, and the air inlet of the temporary stop integrated valve is connected to the second air reservoir; the air inlet of the rear axle brake cylinder, the EPB integrated valve, and the third air reservoir are connected in sequence. The temporary stop integrated valve includes a driving relay valve and two ABS solenoid valves. The EPB integrated valve includes an EPB controller and a parking relay valve. The EPB controller is electrically connected to the EPB switch, the two ABS solenoid valves, and the ABS-ECU.

2. The EPB system for heavy-duty trucks according to claim 1, characterized in that: The control port and air inlet of the temporary stop integrated valve correspond to the control port and air inlet of the travel relay valve, respectively. The air outlet of the travel relay valve is connected to the air inlets of the two ABS solenoid valves, respectively. The air outlets of the two ABS solenoid valves correspond to the air outlets of the temporary stop integrated valve, respectively.

3. The EPB system for heavy-duty trucks according to claim 1, characterized in that: The air inlet and outlet of the EPB integrated valve correspond to the air inlet and outlet of the parking relay valve, respectively.

4. The EPB system for heavy-duty trucks according to claim 1, characterized in that: The air supply device includes an air compressor and an air handling unit. The outlet of the air compressor is connected to the air inlet of the air handling unit, and the outlet of the air handling unit is connected to the air inlets of the first air storage tank, the second air storage tank, and the third air storage tank, respectively.

5. The EPB system for heavy-duty trucks according to claim 1, characterized in that: A pressure sensor is installed on the pipeline between the rear axle brake cylinder and the temporary stop integrated valve, and the pressure sensor is electrically connected to the EPB controller.

6. The EPB system for heavy-duty trucks according to claim 1, characterized in that: The EPB system also includes wheel speed sensors mounted on the wheels of heavy-duty trucks and electrically connected to the ABS-ECU.

7. The EPB system for heavy-duty trucks according to claim 1, characterized in that: The EPB system also includes a battery for powering the EPB system.

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