Control method and device of electronic parking system and vehicle

Abstract

The application discloses a control method and device of an electronic parking system and a vehicle, and the method comprises the following steps: receiving a parking control instruction; when the parking control instruction is a parking brake force detection control instruction, a first electric control valve can be controlled to make a first mechanical valve be closed, so as to cut off a communication air path through which compressed air enters a spring brake air chamber of the vehicle; further, when an air inlet end and an air outlet end of a proportional relay valve are conducted through a voltage control device, a parking brake force detection function can be realized, or when an air exhaust end and the air outlet end of the proportional relay valve are conducted through the voltage control device, a trailer independent brake function can be realized. The application can realize the parking brake force detection function and the trailer independent brake function by coordinating the control of the first electric control valve, the first mechanical valve and the proportional relay valve when the parking control instruction is received, and the control structure and the control process of the electronic parking system adopted by the application are simple, so that the manufacturing cost and the maintenance cost of the electronic parking system can be reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a control method, device, and vehicle for an electronic parking system. Background Technology

[0002] With the continuous improvement of automotive electronics and intelligence, electronic parking systems are being used more and more widely in the vehicle field. However, traditional mechanical parking brakes have drawbacks such as complex operation, slow response, and uncontrollable parking force, making it difficult to meet the needs of modern vehicles for safety, comfort, and intelligent control.

[0003] In existing technologies, the main approach is to integrate components such as solenoid valves and proportional relay valves to control the on / off state and pressure regulation of compressed air, thereby achieving functions such as parking brake, release, and braking force detection to solve the aforementioned problems. However, existing technical solutions have several drawbacks. When there are fewer valve body components, they cannot meet the requirements of the tractor for detecting the parking braking force of the train and controlling the independent braking of the trailer. Furthermore, when there are more valve body components, the electronic parking system has a complex control structure, a cumbersome control process, and higher manufacturing and maintenance costs. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] Therefore, one objective of this invention is to provide a control method for an electronic parking system. This method can shut off a first mechanical valve by using a first electronically controlled valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, a parking braking force detection function can be achieved by using a voltage control device to connect the inlet and outlet ends of the proportional relay valve. Alternatively, an independent trailer braking function can be achieved by using a voltage control device to connect the exhaust and outlet ends of the proportional relay valve. In other words, by setting up a first electronically controlled valve, a first mechanical valve, and a proportional relay valve, and coordinating their control, both parking braking force detection and independent trailer braking functions can be realized. Moreover, the control structure and control process of the electronic parking system adopted in this invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0006] Therefore, a second objective of the present invention is to provide a control device for an electronic parking system.

[0007] Therefore, a third objective of the present invention is to provide a vehicle.

[0008] Therefore, a fourth object of the present invention is to provide a computer-readable storage medium.

[0009] To achieve the above objectives, a first aspect of the present invention provides a control method for an electronic parking system, the electronic parking system comprising: an air inlet, an air outlet, an exhaust outlet, a pressurizing solenoid valve, a depressurizing solenoid valve, a first electrically controlled valve, a first mechanical valve, and a proportional relay valve, the method comprising the following steps:

[0010] Receive parking control commands, including parking brake force detection control commands or trailer independent braking control commands;

[0011] When the parking control command is the parking brake force detection control command, the first electronic control valve is energized, causing the air inlet and outlet of the first mechanical valve connected to the first electronic control valve to disconnect, thereby cutting off the air path between the first mechanical valve and the first end of the outlet connected to the first mechanical valve, thus cutting off the air path between the vehicle's spring brake chamber connected to the second end of the outlet. At the same time, the pressurization solenoid valve is energized, causing the air inlet and outlet of the proportional relay valve to be connected, so that the compressed air of the air inlet connected to the proportional relay valve enters the trailer brake control valve of the vehicle connected to the second end of the outlet through the first end of the outlet connected to the proportional relay valve, thereby realizing the parking brake force detection function.

[0012] Alternatively, when the parking control command is the trailer independent braking control command, the first electronically controlled valve is energized to disconnect the air inlet and outlet of the first mechanical valve connected to the first electronically controlled valve, thereby cutting off the air path between the first mechanical valve and the first end of the outlet connected to the first mechanical valve's outlet. This cuts off the air path between the first mechanical valve and the vehicle's spring brake chamber connected to the second end of the outlet. Simultaneously, the pressure reducing solenoid valve is energized to connect the outlet and exhaust of the proportional relay valve, allowing compressed air from the trailer control valve connected to the second end of the outlet to flow back into the proportional relay valve connected to the first end of the outlet through the outlet, and then be released from the exhaust port connected to the exhaust end of the proportional relay valve, thus achieving the trailer independent braking function.

[0013] According to the control method of the electronic parking system of the present invention, the first mechanical valve can be shut off by the first electronic control valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking braking force detection function can be realized when the air inlet and outlet of the proportional relay valve are connected by the voltage control device, or the trailer independent braking function can be realized when the exhaust end and outlet of the proportional relay valve are connected by the voltage control device. That is, by setting the first electronic control valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking braking force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted by the present invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0014] In addition, the control method of the electronic parking system according to embodiments of the present invention may also have the following additional technical features:

[0015] In some examples, controlling the first solenoid valve to energize and disconnect the inlet and outlet of the first mechanical valve connected to the first solenoid valve includes: controlling the first solenoid valve to energize and allow compressed air to enter the first mechanical valve connected to the outlet of the first solenoid valve through the inlet port connected to the inlet of the first solenoid valve, so as to shut off the first mechanical valve and thereby disconnect the inlet and outlet of the first mechanical valve.

[0016] In some examples, controlling the pressurization solenoid valve to energize and connect the inlet and outlet of the proportional relay valve includes: controlling the pressurization solenoid valve to energize and filling the control chamber of the proportional relay valve connected to the outlet of the pressurization solenoid valve with compressed air from the inlet port connected to the inlet of the pressurization solenoid valve, so that the inlet and outlet of the proportional relay valve are connected.

[0017] In some examples, controlling the energization of the pressure reducing solenoid valve to connect the outlet and exhaust ends of the proportional relay valve includes: controlling the energization of the pressure reducing solenoid valve to release compressed air in the control chamber of the proportional relay valve connected to the inlet end of the pressure reducing solenoid valve through the exhaust port connected to the outlet end of the pressure reducing solenoid valve, thereby connecting the outlet and exhaust ends of the proportional relay valve.

[0018] In some examples, the parking control command further includes a parking brake command; when the parking control command is the parking brake command, the pressure reducing solenoid valve is energized, so that the outlet end and exhaust end of the proportional relay valve are connected, thereby causing the compressed air of the trailer brake control valve of the vehicle and the spring brake chamber of the vehicle connected to the second end of the outlet to flow back into the proportional relay valve connected to the first end of the outlet through the outlet, and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thereby realizing the parking brake function.

[0019] In some examples, the parking control command further includes a parking brake release command; when the parking control command is the parking brake release command, the pressurized solenoid valve is energized to connect the inlet and outlet of the proportional relay valve, thereby allowing compressed air to enter the trailer brake control valve and the spring brake chamber of the vehicle connected to the second outlet of the vehicle through the first outlet connected to the outlet of the proportional relay valve, so as to realize the parking brake release function.

[0020] In some examples, the electronic parking system further includes a pressure sensor, and the method further includes: upon receiving the trailer independent braking control command, acquiring the air pressure at the air outlet; adjusting the on / off time of the pressurizing solenoid valve and / or the depressurizing solenoid valve according to the air pressure at the air outlet, so as to adjust the output ratio of the proportional relay valve, thereby achieving the adjustment of the braking force.

[0021] In some examples, the electronic parking system further includes a controller connected to the proportional relay valve, and the method further includes: upon receiving an active release parking command, controlling the inlet and outlet of the proportional relay valve to be directly connected, so that compressed air enters the trailer brake control valve of the vehicle and the spring brake chamber of the vehicle connected to the second end of the outlet of the vehicle through the first end of the outlet connected to the outlet of the proportional relay valve, thereby realizing the release of the parking brake function.

[0022] To achieve the above objectives, a second aspect of the present invention provides a control device for an electronic parking system. The electronic parking system includes: an air inlet, an air outlet, an exhaust outlet, a pressurizing solenoid valve, a depressurizing solenoid valve, a first electrically controlled valve, a first mechanical valve, and a proportional relay valve. The device includes: a receiving module for receiving parking control commands, including parking brake force detection control commands or trailer independent braking control commands; and a control module that, when the parking control command is the parking brake force detection control command, controls the first electrically controlled valve to energize, disconnecting the air inlet and outlet of the first mechanical valve connected to the first electrically controlled valve, thereby cutting off the air path between the first mechanical valve and the first end of the air outlet connected to the first mechanical valve's outlet, thus cutting off the air path between the vehicle's spring brake chamber connected to the second end of the air outlet. Simultaneously, it controls the pressurizing solenoid valve to energize, connecting the air inlet and outlet of the proportional relay valve, thereby increasing the pressure at the air inlet connected to the proportional relay valve's inlet. Compressed air enters the trailer brake control valve of the vehicle, which is connected to the second end of the outlet of the proportional relay valve, through the first end of the outlet connected to the outlet end of the proportional relay valve, to realize the parking brake force detection function; or, when the parking control command is the trailer independent braking control command, the first electronic control valve is energized to disconnect the inlet and outlet ends of the first mechanical valve connected to the first electronic control valve, thereby cutting off the air path between the first mechanical valve and the first end of the outlet connected to the outlet end of the first mechanical valve, thus cutting off the air path between the first mechanical valve and the spring brake chamber of the vehicle connected to the second end of the outlet end of the first mechanical valve. At the same time, the pressure reducing solenoid valve is energized to connect the outlet end and exhaust end of the proportional relay valve, so that the compressed air of the trailer control valve connected to the second end of the outlet flows back into the proportional relay valve connected to the first end of the outlet end through the outlet end, and is released from the exhaust port connected to the exhaust end of the proportional relay valve, thereby realizing the trailer independent braking function.

[0023] According to the control device of the electronic parking system of the present invention, the first mechanical valve can be shut off by the first electronic control valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking braking force detection function can be realized when the air inlet and outlet of the proportional relay valve are connected by the voltage control device, or the trailer independent braking function can be realized when the exhaust end and outlet of the proportional relay valve are connected by the voltage control device. That is, by setting the first electronic control valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking braking force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted by the present invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0024] To achieve the above objectives, a third aspect of the present invention discloses a vehicle, which includes: a control device for the electronic parking system described in the second aspect of the present invention.

[0025] According to the vehicle of the present invention, the first mechanical valve can be shut off by the first electronically controlled valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking brake force detection function can be realized when the inlet and outlet of the proportional relay valve are connected by the voltage control device, or the trailer independent braking function can be realized when the exhaust and outlet of the proportional relay valve are connected by the voltage control device. That is, by setting the first electronically controlled valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking brake force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted by the present invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0026] To achieve the above objectives, a fourth aspect of the present invention discloses a computer-readable storage medium storing a control program based on an electronic parking system. When the control program is executed by a processor, it implements the control method of the electronic parking system as described in the first aspect of the present invention.

[0027] According to an embodiment of the present invention, when the control program of the electronic parking system stored thereon is executed by a processor, the first mechanical valve can be shut off by the first electronically controlled valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking braking force detection function can be realized by connecting the air inlet and outlet of the proportional relay valve through a voltage control device, or the trailer independent braking function can be realized by connecting the exhaust and outlet of the proportional relay valve through a voltage control device. That is, by setting the first electronically controlled valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking braking force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted by the present invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a schematic diagram of the structure of an electronic parking system according to an embodiment of the present invention;

[0031] Figure 2 This is a flowchart illustrating a control method for an electronic parking system according to an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the structure of the control device of an electronic parking system according to an embodiment of the present invention.

[0033] Figure label:

[0034] Electronic parking system-10; air inlet-1; air outlet-2; exhaust outlet-3; voltage control device-4; first electronic control valve-5; first mechanical valve-6; proportional relay valve-7; control device for electronic parking system-100; receiving module-110; control module-120. Detailed Implementation

[0035] To provide a more detailed understanding of the features and technical content of the embodiments of the present invention, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of the present invention. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0036] The following is for reference. Figures 1-3 A control method and apparatus for an electronic parking system according to an embodiment of the present invention are described.

[0037] First, combined Figure 1 The relevant structure of the electronic parking system 10 involved in the embodiments of the present invention is described.

[0038] like Figure 1 As shown, the electronic parking system 10 includes: an air inlet 1, an air outlet 2, an exhaust outlet 3, a voltage control device 4, a first electronically controlled valve 5, a first mechanical valve 6, and a proportional relay valve 7, wherein...

[0039] The inlet end of the first solenoid valve 5 is connected to the inlet port 1, and the outlet end of the first solenoid valve 5 is connected to the inlet end of the first mechanical valve 6. The first solenoid valve 5 causes the compressed air from the inlet port 1 to enter the first mechanical valve 6 to shut off the first mechanical valve 6, thereby disconnecting the inlet end and outlet end of the first mechanical valve 6.

[0040] Specifically, in the electronic parking system 10, the air inlet of the first electronically controlled valve 5 can be connected to the air inlet 1, and the air outlet of the first electronically controlled valve 5 can be connected to the air inlet of the first mechanical valve 6 to form a compressed air transmission channel. Furthermore, when the first electronically controlled valve 5 is energized, its internal air passage can be opened. At this time, compressed air from the air inlet 1 can enter through the air inlet of the first electronically controlled valve 5 and flow out from the air outlet, entering the first mechanical valve 6 and closing the first mechanical valve 6, thereby disconnecting the air inlet and air outlet of the first mechanical valve 6.

[0041] The outlet end of the first mechanical valve 6 is connected to the first end of the outlet 2. When the first mechanical valve 6 is closed, the air passage between the first mechanical valve 6 and the first end of the outlet 2 is cut off, thereby cutting off the air passage between the vehicle's spring brake chamber connected to the second end of the outlet 2.

[0042] Specifically, the outlet end of the first mechanical valve 6 is connected to the first end of the outlet 2, and the second end of the outlet 2 is connected to the spring brake chamber of the vehicle. When the first mechanical valve 6 is closed, the air passage between the first mechanical valve 6 and the first end of the outlet 2 can be cut off. Since the first end and the second end of the outlet 2 are interconnected, the air passage between the upstream air passage (inlet 1 → first electronic control valve 5 → first mechanical valve 6, or inlet 1 → proportional relay valve 7) and the spring brake chamber of the vehicle connected to the second end of the outlet 2 can be cut off, so that compressed air cannot enter the spring brake chamber of the vehicle through the outlet 2.

[0043] The voltage control device 4 is connected to the proportional relay valve 7 and is used to control the opening and closing of the inlet and outlet ends of the proportional relay valve 7, as well as the opening and closing of the exhaust end and outlet end of the proportional relay valve 7.

[0044] Specifically, the voltage control device 4 is connected to the proportional relay valve 7. It can control the on / off state of the inlet and outlet ends of the proportional relay valve 7, as well as the on / off state of its exhaust and outlet ends, by adjusting the flow rate and pressure of the compressed air entering the control chamber of the proportional relay valve 7. For example, the voltage control device 4 can precisely control the operation of the proportional relay valve 7 by adjusting parameters such as its magnitude, frequency, or duty cycle, thereby controlling the on / off state of the inlet and outlet ends of the proportional relay valve 7, as well as the on / off state of its exhaust and outlet ends.

[0045] The inlet end of the proportional relay valve 7 is connected to the inlet port 1, and the outlet end of the proportional relay valve 7 is connected to the first end of the outlet port 2. When the inlet end and outlet end of the proportional relay valve 7 are connected, compressed air enters the trailer brake control valve of the vehicle connected to the second end of the outlet port 2 to realize the parking brake force detection function.

[0046] Specifically, the inlet end of the proportional relay valve 7 is connected to the inlet port 1 to obtain stable compressed air, and the outlet end of the proportional relay valve 7 is connected to the first end of the outlet port 2. When the inlet and outlet ends of the proportional relay valve 7 are connected, the compressed air from the inlet port 1 enters the trailer brake control valve of the vehicle connected to the second end of the outlet port 2 to realize the parking brake force detection function. For example, when the vehicle is in a parked state, with the first mechanical valve 6 closed, cutting off the air passage between the first mechanical valve 6 and the first end of the outlet port 2, thereby cutting off the air passage between the spring brake chamber of the vehicle connected to the second end of the outlet port 2, the compressed air entering the trailer brake control valve of the vehicle can release the trailer brake. At this time, it is possible to detect whether the vehicle is rolling. If the vehicle does not roll, it means that the parking brake force of the vehicle meets the requirements for hill parking; if the vehicle rolls, it means that the parking brake force of the vehicle does not meet the requirements for hill parking, thus realizing the parking brake force detection.

[0047] The exhaust end of the proportional relay valve 7 is connected to the exhaust port 3. When the exhaust end of the proportional relay valve 7 is connected to the outlet end, the compressed air of the trailer brake control valve connected to the second end of the outlet port 2 flows back into the proportional relay valve 7 connected to the first end of the outlet port 2 through the outlet port 2, and is released from the exhaust port 3 connected to the exhaust end of the proportional relay valve 7, thereby realizing the independent braking function of the trailer.

[0048] Specifically, the exhaust end of the proportional relay valve 7 is connected to the exhaust port 3. When the exhaust end of the proportional relay valve 7 is connected to the outlet end, the compressed air of the trailer brake control valve connected to the second end of the outlet port 2 can flow back into the first end of the outlet port 2 through the second end of the outlet port 2, and then enter the interior of the proportional relay valve 7 through the outlet end of the proportional relay valve 7. At the same time, the compressed air entering the proportional relay valve 7 flows directly to the exhaust port 3 through the exhaust end and is finally discharged to the atmosphere. At this time, with the rapid discharge of compressed air, the air pressure inside the trailer brake control valve drops rapidly, thereby realizing the independent braking function of the trailer.

[0049] According to an embodiment of the present invention, the electronic parking system 10 can shut off the first mechanical valve 6 by using the first electronically controlled valve 5 to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking braking force detection function can be realized by using the voltage control device 4 to connect the air inlet and outlet of the proportional relay valve 7, or the trailer independent braking function can be realized by using the voltage control device 4 to connect the air outlet and exhaust of the proportional relay valve 7. That is, by setting the first electronically controlled valve 5, the first mechanical valve 6 and the proportional relay valve 7 and coordinating their control, the parking braking force detection function and the trailer independent braking function can be realized. At the same time, the control structure and control process of the electronic parking system 10 are simplified, and the manufacturing cost and maintenance cost of the electronic parking system 10 are reduced.

[0050] In one embodiment of the present invention, the air outlet 2 includes a first air outlet 2, a second air outlet 2 and a third air outlet 2, wherein one end of the first air outlet 2, the second air outlet 2 and the third air outlet 2 are respectively connected to the spring brake chamber of the vehicle.

[0051] Specifically, the air outlet 2 includes a first air outlet 2, a second air outlet 2, and a third air outlet 2. That is, the air outlet 2 can be further subdivided into channels, each independently connected to the vehicle's spring brake chamber, forming a multi-path air distribution structure. For example, the air outlet 2 can be divided into three independent channels (first, second, and third air outlets 2), each connected to a different spring brake chamber (e.g., corresponding to different axles or braking units of the vehicle). This allows for zoned braking (e.g., independent control of the front axle, rear axle, or middle axle), improving the flexibility of braking force distribution. Furthermore, when one air outlet 2 malfunctions (e.g., blockage or leakage), the other air outlets 2 can still operate normally, ensuring that some braking functions remain available and improving the reliability of the electronic parking system 10.

[0052] In one embodiment of the present invention, the air outlet 2 further includes a fourth air outlet 2, one end of which is connected to the air inlet of the trailer brake control valve of the vehicle.

[0053] Specifically, the air outlet 2 also includes a fourth air outlet 2. One end of the fourth air outlet 2 is connected to the air inlet of the trailer brake control valve, which can form a compressed air passage from the electronic parking system 10 to the trailer brake control valve. The electronic parking system 10 can fill or release compressed air into the trailer brake control valve through the fourth air outlet 2, thereby realizing independent braking of the trailer and release of the trailer braking force.

[0054] In one embodiment of the present invention, the electronic parking system 10 further includes a pressure sensor connected to the air outlet 2 for detecting the air pressure at the air outlet 2.

[0055] Specifically, the electronic parking system 10 also includes a pressure sensor connected to the air outlet 2 to detect the air pressure at the air outlet 2, reflecting the working status of the air circuit of the electronic parking system 10. The pressure sensor may include, but is not limited to, a main pipe installed at the air outlet 2 (i.e., the convergence point of all air outlets 2).

[0056] In one embodiment of the present invention, the electronic parking system 10 further includes a controller connected to a proportional relay valve 7. The controller is used to control the air inlet and outlet of the proportional relay valve 7 to be directly connected when a manual release command is received, so that compressed air enters the trailer brake control valve and the spring brake chamber of the vehicle connected to the second end of the outlet 2 connected to the outlet 2 of the proportional relay valve 7 through the first end of the outlet 2, thereby realizing the release of the parking brake function.

[0057] Specifically, the electronic parking system 10 also includes a controller connected to the proportional relay valve 7. When it receives an active release command (e.g., the driver actively presses the electronic parking brake release button), it actively sends an electrical signal to the proportional relay valve 7 (e.g., activates the pressurizing solenoid valve), driving the valve core inside the proportional relay valve 7 to move, opening the passage from the inlet end to the outlet end of the proportional relay valve 7, allowing compressed air to flow into the proportional relay valve 7 from the inlet 1, and then flow through the outlet end to the first end of the outlet 2, so as to enter the trailer brake control valve of the vehicle and the spring brake chamber of the vehicle connected to the second end of the outlet 2, thereby realizing the release of the parking brake function.

[0058] In one embodiment of the present invention, the electronic parking system 10 further includes a plurality of power supply devices for controlling the current flow of the voltage control device 4 and the first electronically controlled valve 5.

[0059] Specifically, the electronic parking system 10 also includes multiple power supply devices, which are respectively connected to the voltage control device 4 and the first electronically controlled valve 5. These power supply devices can independently control the current flow of the voltage control device 4 and the first electronically controlled valve 5 to achieve different functions. For example, the voltage control device 4 and the first electronically controlled valve 5 can be energized simultaneously to achieve the independent braking function of the vehicle and trailer. Alternatively, the voltage control device 4 can be energized to de-energize the first electronically controlled valve 5 to achieve the parking brake function or release the parking brake function.

[0060] In one embodiment of the present invention, the voltage control device 4 includes: a pressure solenoid valve, the inlet end of which is connected to the inlet port 1, and the outlet end of which is connected to the control chamber of the proportional relay valve 7, for allowing compressed air to enter the control chamber of the proportional relay valve 7 so that the inlet end and outlet end of the proportional relay valve 7 are connected.

[0061] Specifically, the voltage control device 4 includes a pressure solenoid valve. The air inlet of the pressure solenoid valve is connected to the air inlet 1. After the pressure solenoid valve is energized, the compressed air in the air inlet 1 enters the pressure solenoid valve through the air inlet and then enters the control chamber of the proportional relay valve 7 through the air outlet. This causes the air pressure in the control chamber of the proportional relay valve 7 to gradually increase, pushing the valve core of the proportional relay valve 7 to move, so that the air inlet and outlet of the proportional relay valve 7 are connected.

[0062] In one embodiment of the present invention, the voltage control device 4 further includes: a pressure reducing solenoid valve, the air inlet of which is connected to the control chamber of the proportional relay valve 7, and the air outlet of which is connected to the exhaust port 3, for releasing the compressed air in the control chamber of the proportional relay valve 7 from the exhaust port 3, so that the exhaust end and the air outlet of the proportional relay valve 7 are connected.

[0063] Specifically, the voltage control device 4 also includes a pressure reducing solenoid valve. The inlet end of the pressure reducing solenoid valve is connected to the control chamber of the proportional relay valve 7, and the outlet end of the pressure reducing solenoid valve is connected to the exhaust port 3. After the pressure reducing solenoid valve is energized, the compressed air in the control chamber of the proportional relay valve 7 is released from the exhaust port 3. As the compressed air is discharged from the control chamber of the proportional relay valve 7, the air pressure in the control chamber of the proportional relay valve 7 gradually decreases, the air pressure force weakens, and the valve core of the proportional relay valve 7 is displaced under the action of spring force or reverse air pressure, thereby making the exhaust end and the outlet end of the proportional relay valve 7 connected.

[0064] In one embodiment of the present invention, when the inlet and outlet of the proportional relay valve 7 are connected, compressed air is allowed to enter the trailer brake control valve of the vehicle and the spring brake chamber of the vehicle connected to the second end of the outlet 2, thereby realizing the release of the parking brake function.

[0065] Specifically, when the inlet and outlet of the proportional relay valve 7 are connected, the compressed air from the inlet 1 can enter the second end of the outlet 2 through the first end. Since the second end of the outlet 2 is connected to both the trailer brake control valve and the spring brake chamber, the compressed air can be divided into two paths to enter the trailer brake control valve and the spring brake chamber, thus releasing the parking brake. For example, when the trailer brake control valve receives compressed air, the internal valve core actuates (e.g., pushes the diaphragm or piston), opening the air passage of the trailer brake. The compressed air enters the parking control chamber of the trailer brake, increasing the air pressure and pushing the diaphragm or piston to compress the spring, releasing the clamping force of the trailer brake and thus releasing the trailer brake. Simultaneously, when the spring brake chamber receives compressed air, the internal diaphragm or piston is pushed by the compressed air, compressing the preload spring and releasing the clamping force of the brake, thus releasing the parking brake of the tractor.

[0066] In one embodiment of the present invention, when the exhaust end of the proportional relay valve 7 is connected to the outlet end, the compressed air of the trailer brake control valve of the vehicle and the spring brake chamber of the vehicle connected to the second end of the outlet 2 enters the proportional relay valve 7 connected to the first end of the outlet 2 through the outlet 2, and is released from the exhaust port 3 connected to the exhaust end of the proportional relay valve 7, thereby realizing the release of the parking brake function.

[0067] Specifically, when the exhaust end and outlet end of the proportional relay valve 7 are connected, due to the decrease in air pressure of the proportional relay valve 7, the compressed air of the trailer brake control valve and the spring brake chamber of the vehicle connected to the second end of the outlet 2 will flow back into the proportional relay valve 7 connected to the first end of the outlet 2 through the outlet 2, and be released from the exhaust port 3 connected to the exhaust end of the proportional relay valve 7, thereby realizing the release of the parking brake function.

[0068] Figure 2 This is a flowchart illustrating a control method for an electronic parking system according to an embodiment of the present invention. The method includes the following steps:

[0069] Receive parking control commands, including parking brake force detection control commands or trailer independent braking control commands.

[0070] Specifically, the electronic parking system can receive instructions for controlling the parking brake function, including specific operational objectives (such as detecting braking force or independently controlling trailer brakes). The parking control instructions include, but are not limited to, those from driver operation (such as electronic handbrake button, instrument panel instructions), vehicle control system (such as hill start assist system, automatic driving system) or remote monitoring platform (such as fleet management system).

[0071] When the parking control command is the parking brake force detection control command, the first electronic control valve is energized, which disconnects the air inlet and outlet of the first mechanical valve connected to the first electronic control valve, thereby cutting off the air path between the first mechanical valve and the first end of the outlet connected to the first mechanical valve, thus cutting off the air path between the vehicle's spring brake chamber connected to the second end of the outlet. At the same time, the pressurization solenoid valve is energized, which connects the air inlet and outlet of the proportional relay valve, so that the compressed air from the air inlet connected to the proportional relay valve enters the trailer brake control valve of the vehicle connected to the second end of the outlet through the first end of the outlet connected to the proportional relay valve, thereby realizing the parking brake force detection function.

[0072] Alternatively, when the parking control command is a trailer independent braking control command, the first electronic control valve is energized to disconnect the air inlet and outlet of the first mechanical valve connected to the first electronic control valve. This cuts off the air path between the first mechanical valve and the first end of the outlet port connected to the first mechanical valve, thereby cutting off the air path between the first mechanical valve and the vehicle's spring brake chamber connected to the second end of the outlet port. Simultaneously, the pressure reducing solenoid valve is energized to connect the outlet and exhaust ends of the proportional relay valve. This allows the compressed air from the trailer control valve connected to the second end of the outlet port to flow back into the proportional relay valve connected to the first end of the outlet port and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thus achieving the trailer independent braking function.

[0073] Specifically, when a parking control command is detected as a parking brake force detection control command, the first electronically controlled valve can be energized to open its internal air passage. At this time, compressed air from the intake port can enter through the intake end of the first electronically controlled valve and flow out from the outlet end, entering the first mechanical valve and closing it. This disconnects the intake and outlet ends of the first mechanical valve, cutting off the air passage between the first mechanical valve and the first end of the outlet connected to the first mechanical valve, thereby cutting off the air passage between the second end of the outlet and the vehicle's spring brake chamber. Simultaneously, the pressurization solenoid valve can be energized to allow air to enter. Compressed air from the inlet enters the control chamber of the proportional relay valve through a pressurizing solenoid valve, connecting the inlet and outlet ends of the proportional relay valve. This allows the compressed air from the inlet connected to the proportional relay valve to enter the trailer brake control valve connected to the second outlet end of the vehicle through the first outlet end connected to the proportional relay valve, releasing the trailer brake. At this point, it is possible to detect whether the vehicle is rolling. If the vehicle does not roll, it means that the vehicle's parking brake force meets the requirements for hill parking. If the vehicle rolls, it means that the vehicle's parking brake force does not meet the requirements for hill parking, thus enabling parking brake force detection.

[0074] Furthermore, when the parking control command is detected as a trailer independent braking control command, the first electronic control valve can be energized to open its internal air passage. At this time, compressed air from the air inlet can enter through the air inlet end of the first electronic control valve and flow out from the air outlet end, entering the first mechanical valve and closing it. This disconnects the air inlet end and air outlet end of the first mechanical valve, cutting off the air passage between the first mechanical valve and the first end of the air outlet connected to the first mechanical valve. This also cuts off the air passage between the vehicle's spring brake chamber connected to the second end of the air outlet. Simultaneously, the pressure reducing solenoid valve can be energized to discharge the compressed air in the control chamber of the proportional relay valve from the exhaust port, making the exhaust end and air outlet end of the proportional relay valve connected. This allows the compressed air from the trailer control valve connected to the second end of the air outlet to flow back into the proportional relay valve connected to the first end of the air outlet through the air outlet and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thus realizing the trailer independent braking function.

[0075] Therefore, the control method of the above-mentioned electronic parking system can shut off the first mechanical valve by using the first electronic control valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking braking force detection function can be realized by using a voltage control device to connect the air inlet and outlet of the proportional relay valve, or the trailer independent braking function can be realized by using a voltage control device to connect the air outlet and outlet of the proportional relay valve. That is, by setting the first electronic control valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking braking force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted in this invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0076] In one embodiment of the present invention, controlling the first solenoid valve to be energized to disconnect the air inlet and air outlet of the first mechanical valve connected to the first solenoid valve includes: controlling the first solenoid valve to be energized to allow compressed air to enter the first mechanical valve connected to the air outlet through the air inlet connected to the air inlet of the first solenoid valve, so as to shut off the first mechanical valve and thereby disconnect the air inlet and air outlet of the first mechanical valve.

[0077] Specifically, in the electronic parking system, since the air inlet of the first electronically controlled valve is connected to the air inlet, and the air outlet of the first electronically controlled valve is connected to the air inlet of the first mechanical valve, a compressed air transmission channel is constructed. Therefore, the first electronically controlled valve can be energized to open its internal air passage. At this time, compressed air from the air inlet can enter through the air inlet of the first electronically controlled valve and flow out from the air outlet, entering the first mechanical valve and closing the first mechanical valve, thereby disconnecting the air inlet and air outlet of the first mechanical valve.

[0078] In one embodiment of the present invention, controlling the pressurizing solenoid valve to be energized to make the inlet end and outlet end of the proportional relay valve connected are connected, including: controlling the pressurizing solenoid valve to be energized to fill the control chamber of the proportional relay valve connected to the outlet end of the pressurizing solenoid valve with compressed air from the inlet port connected to the inlet end of the pressurizing solenoid valve, so as to make the inlet end and outlet end of the proportional relay valve connected.

[0079] Specifically, in the electronic parking system, since the inlet end of the pressure solenoid valve is connected to the air inlet and the outlet end of the pressure solenoid valve is connected to the control chamber of the proportional relay valve, the pressure solenoid valve can be energized to allow compressed air from the air inlet to enter the pressure solenoid valve through its inlet end and then enter the control chamber of the proportional relay valve through its outlet end. This causes the air pressure in the control chamber of the proportional relay valve to gradually increase, pushing the valve core of the proportional relay valve to move and thus connecting the inlet end and outlet end of the proportional relay valve.

[0080] In one embodiment of the present invention, controlling the pressure reducing solenoid valve to be energized to make the outlet end of the proportional relay valve connected to the exhaust end includes: controlling the pressure reducing solenoid valve to be energized so that the compressed air in the control chamber of the proportional relay valve connected to the inlet end of the pressure reducing solenoid valve is released through the exhaust port connected to the outlet end of the pressure reducing solenoid valve, so that the outlet end of the proportional relay valve is connected to the exhaust end.

[0081] Specifically, in the electronic parking system, since the inlet end of the pressure reducing solenoid valve is connected to the control chamber of the proportional relay valve, and the outlet end of the pressure reducing solenoid valve is connected to the exhaust port, the pressure reducing solenoid valve can be energized to release the compressed air in the control chamber of the proportional relay valve from the exhaust port. As the compressed air is discharged from the control chamber of the proportional relay valve, the air pressure in the control chamber of the proportional relay valve gradually decreases, the air pressure force weakens, and the valve core of the proportional relay valve is displaced under the action of spring force or reverse air pressure, thereby making the exhaust end and outlet end of the proportional relay valve connected.

[0082] In one embodiment of the present invention, the parking control command further includes a parking brake command; when the parking control command is a parking brake command, the pressure reducing solenoid valve is energized to make the outlet end of the proportional relay valve connected to the exhaust end, thereby causing the compressed air of the trailer brake control valve of the vehicle and the spring brake chamber of the vehicle connected to the second end of the outlet to flow back into the proportional relay valve connected to the first end of the outlet through the outlet, and to be released from the exhaust port connected to the exhaust end of the proportional relay valve, thereby realizing the parking brake function.

[0083] Specifically, the parking control command also includes a parking brake command. When the parking control command is detected to be a parking brake command, the pressure reducing solenoid valve can be energized to make the exhaust end and outlet end of the proportional relay valve connected. At this time, due to the reduction of air pressure in the proportional relay valve, the compressed air in the trailer brake control valve and the spring brake chamber of the vehicle connected to the second end of the outlet will flow back into the proportional relay valve connected to the first end of the outlet through the outlet, and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thereby realizing the release of the parking brake function.

[0084] In one embodiment of the present invention, the parking control command further includes a parking brake release command; when the parking control command is a parking brake release command, the pressurization solenoid valve is energized to connect the inlet and outlet of the proportional relay valve, thereby allowing compressed air to enter the trailer brake control valve and the spring brake chamber of the vehicle connected to the second outlet of the vehicle through the first outlet end connected to the outlet end of the proportional relay valve, so as to realize the parking brake release function.

[0085] Specifically, the parking control command also includes a parking brake release command. When the parking control command is a parking brake release command, the pressurization solenoid valve can be energized to connect the air inlet and outlet of the proportional relay valve. At this time, the compressed air in the air inlet can enter the second outlet through the first outlet. Since the second outlet is connected to both the trailer brake control valve and the spring brake chamber of the vehicle, the compressed air can be divided into two paths to enter the trailer brake control valve and the spring brake chamber of the vehicle, thereby realizing the parking brake release function. For example, when the trailer brake control valve receives compressed air, the internal valve core actuates (such as pushing the diaphragm or piston), which opens the air passage of the trailer brake. Compressed air enters the parking control chamber of the trailer brake, and the air pressure in the parking control chamber increases, pushing the diaphragm or piston to compress the spring and release the clamping force of the trailer brake, thereby releasing the trailer brake. At the same time, when the spring brake chamber receives compressed air, the internal diaphragm or piston is pushed by the compressed air, compressing the preload spring, which can release the clamping force of the brake, thereby releasing the parking brake of the tractor.

[0086] In one embodiment of the present invention, the electronic parking system further includes a pressure sensor, and the method further includes: acquiring the air pressure at the air outlet when receiving an independent braking control command for the trailer;

[0087] Adjust the on / off time of the pressurizing solenoid valve and / or the depressurizing solenoid valve according to the air pressure at the outlet to adjust the output ratio of the proportional relay valve, thereby achieving the adjustment of the braking force.

[0088] Specifically, the electronic parking brake system is also equipped with a pressure sensor that can detect the air pressure at air outlet 2 to reflect the working status of the air circuit of the electronic parking brake system. The pressure sensor includes, but is not limited to, a main pipe installed at the air outlet (i.e., the convergence point of all air outlets).

[0089] Furthermore, upon receiving an independent braking control command for the trailer, the system can acquire the current air pressure at the outlet and dynamically adjust the energizing time (duty cycle) of the pressurizing and depressurizing solenoid valves based on this pressure. This controls the output air pressure ratio of the proportional relay valve, thereby regulating the braking force. For example, when the braking force is low, the energizing time of the pressurizing solenoid valve can be increased, allowing more compressed air to enter the control chamber of the proportional relay valve, pushing the valve core to move and increasing the flow between the inlet and outlet, thus increasing the outlet air pressure and enhancing the trailer's braking force. Similarly, when the braking force is high, the energizing time of the depressurizing solenoid valve can be increased, accelerating the release of compressed air from the proportional relay valve's control chamber, allowing the compressed air in the trailer brake control valve to flow back and be released quickly, thereby reducing the trailer's braking force.

[0090] In one embodiment of the present invention, the electronic parking system further includes a controller connected to a proportional relay valve. The method further includes: when receiving an active release parking command, controlling the air inlet and outlet of the proportional relay valve to be directly connected, so that compressed air enters the trailer brake control valve and the spring brake chamber of the vehicle connected to the second outlet of the vehicle through the first outlet end connected to the outlet end of the proportional relay valve, thereby realizing the release parking brake function.

[0091] Specifically, the electronic parking brake system also includes a controller connected to the proportional relay valve, which can directly control the proportional relay valve. For example, when a driver actively releases the parking brake (e.g., the driver actively presses the electronic parking brake release button), the controller can actively send an electrical signal to the proportional relay valve (e.g., activate the pressurization solenoid valve), driving the valve core inside the proportional relay valve to move, opening the passage from the inlet to the outlet of the proportional relay valve, allowing compressed air to flow into the proportional relay valve from the inlet and through the outlet to the first end of the outlet, so as to enter the trailer brake control valve and the spring brake chamber of the vehicle connected to the second end of the outlet, thereby realizing the function of releasing the parking brake.

[0092] In summary, the control method of the electronic parking system according to the embodiments of the present invention can shut off the first mechanical valve by using the first electronic control valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking braking force detection function can be realized when the inlet and outlet of the proportional relay valve are connected by the voltage control device, or the trailer independent braking function can be realized when the exhaust and outlet of the proportional relay valve are connected by the voltage control device. That is, by setting the first electronic control valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking braking force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted by the present invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0093] A further embodiment of the present invention provides a control device for an electronic parking system, such as... Figure 3 As shown, the control device 100 of the electronic parking system includes: a receiving module 110 and a control module 120, wherein,

[0094] The receiving module 110 receives parking control commands, which include parking brake force detection control commands or trailer independent braking control commands.

[0095] When the parking control command is a parking brake force detection control command, the control module 120 controls the first electronic control valve to be energized, thereby disconnecting the air inlet and outlet of the first mechanical valve connected to the first electronic control valve, cutting off the air path between the first mechanical valve and the first end of the outlet connected to the first mechanical valve, thereby cutting off the air path between the vehicle's spring brake chamber connected to the second end of the outlet. At the same time, the control module 120 controls the pressurization solenoid valve to be energized, thereby connecting the air inlet and outlet of the proportional relay valve, so that the compressed air from the air inlet connected to the proportional relay valve enters the trailer brake control valve of the vehicle connected to the second end of the outlet through the first end of the outlet connected to the proportional relay valve, thereby realizing the parking brake force detection function.

[0096] Alternatively, when the parking control command is a trailer independent braking control command, the first electronic control valve is energized to disconnect the air inlet and outlet of the first mechanical valve connected to the first electronic control valve. This cuts off the air path between the first mechanical valve and the first end of the outlet port connected to the first mechanical valve, thereby cutting off the air path between the first mechanical valve and the vehicle's spring brake chamber connected to the second end of the outlet port. Simultaneously, the pressure reducing solenoid valve is energized to connect the outlet and exhaust ends of the proportional relay valve. This allows the compressed air from the trailer control valve connected to the second end of the outlet port to flow back into the proportional relay valve connected to the first end of the outlet port and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thus achieving the trailer independent braking function.

[0097] In some embodiments, when the first solenoid valve is energized to disconnect the inlet and outlet of the first mechanical valve connected to the first solenoid valve, the control module 120 is specifically used to: energize the first solenoid valve to allow compressed air to enter the first mechanical valve connected to the outlet through the inlet port connected to the inlet of the first solenoid valve, so as to shut off the first mechanical valve and disconnect the inlet and outlet of the first mechanical valve.

[0098] In some embodiments, when the pressure solenoid valve is energized to make the inlet end and outlet end of the proportional relay valve connected, the control module 120 is specifically used to: energize the pressure solenoid valve to fill the control chamber of the proportional relay valve connected to the outlet end of the pressure solenoid valve with compressed air from the inlet port connected to the inlet end of the pressure solenoid valve, so as to make the inlet end and outlet end of the proportional relay valve connected.

[0099] In some embodiments, when the pressure reducing solenoid valve is energized to connect the outlet end and the exhaust end of the proportional relay valve, the control module 120 is specifically used to: energize the pressure reducing solenoid valve so that the compressed air in the control chamber of the proportional relay valve connected to the inlet end of the pressure reducing solenoid valve is released through the exhaust port connected to the outlet end of the pressure reducing solenoid valve, so that the outlet end and the exhaust end of the proportional relay valve are connected.

[0100] In some embodiments, the parking control command further includes a parking brake command; when the parking control command is a parking brake command, the control module 120 is also used to: control the pressure reducing solenoid valve to be energized, so that the outlet end of the proportional relay valve is connected to the exhaust end, thereby causing the compressed air of the trailer brake control valve of the vehicle and the spring brake chamber of the vehicle connected to the second end of the outlet to flow back into the proportional relay valve connected to the first end of the outlet through the outlet, and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thereby realizing the parking brake function.

[0101] In some embodiments, the parking control command further includes a parking brake release command; when the parking control command is a parking brake release command, the control module 120 is further configured to: control the pressurization solenoid valve to be energized, so that the inlet end and outlet end of the proportional relay valve are connected, thereby allowing compressed air to enter the trailer brake control valve of the vehicle and the spring brake chamber of the vehicle connected to the second end of the outlet end connected to the outlet end of the proportional relay valve, so as to realize the parking brake release function.

[0102] In some embodiments, the electronic parking system further includes a pressure sensor, and the control module 120 is also configured to: acquire the air pressure at the outlet when receiving an independent braking control command for the trailer; adjust the on / off time of the pressurizing solenoid valve and / or the depressurizing solenoid valve according to the air pressure at the outlet, so as to adjust the output ratio of the proportional relay valve, thereby realizing the adjustment of the braking force.

[0103] In some embodiments, the electronic parking system further includes a controller connected to a proportional relay valve. The control module 120 is further configured to: upon receiving an active release parking command, control the inlet and outlet of the proportional relay valve to be directly connected, so that compressed air enters the trailer brake control valve and the vehicle's spring brake chamber connected to the second outlet of the vehicle through the first outlet end connected to the outlet end of the proportional relay valve, thereby realizing the release of the parking brake function.

[0104] According to the control device 100 of the electronic parking system of the present invention, the first mechanical valve can be shut off by the first electronic control valve to cut off the air passage connecting the compressed air to the spring brake chamber of the vehicle. Furthermore, the parking braking force detection function can be realized when the air inlet end and the air outlet end of the proportional relay valve are connected by the voltage control device, or the trailer independent braking function can be realized when the exhaust end and the air outlet end of the proportional relay valve are connected by the voltage control device. That is, by setting the first electronic control valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking braking force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted by the present invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0105] To achieve the above objectives, a third aspect of the present invention discloses a vehicle, which includes: a control device for an electronic parking system according to a second aspect of the present invention.

[0106] According to the vehicle of the present invention, the first mechanical valve can be shut off by the first electronically controlled valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking brake force detection function can be realized when the inlet and outlet of the proportional relay valve are connected by the voltage control device, or the trailer independent braking function can be realized when the exhaust and outlet of the proportional relay valve are connected by the voltage control device. That is, by setting the first electronically controlled valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking brake force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted by the present invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0107] To achieve the above objectives, a fourth aspect of the present invention discloses a computer-readable storage medium storing a control program based on an electronic parking system. When the control program is executed by a processor, it implements the control method of the electronic parking system as described in the first aspect of the present invention.

[0108] According to an embodiment of the present invention, when the control program of the electronic parking system stored thereon is executed by a processor, the first mechanical valve can be shut off by the first electronically controlled valve to cut off the air passage for compressed air to enter the spring brake chamber of the vehicle. Furthermore, the parking braking force detection function can be realized by connecting the air inlet and outlet of the proportional relay valve through a voltage control device, or the trailer independent braking function can be realized by connecting the exhaust and outlet of the proportional relay valve through a voltage control device. That is, by setting the first electronically controlled valve, the first mechanical valve and the proportional relay valve and coordinating their control, the parking braking force detection function and the trailer independent braking function can be realized. Moreover, the control structure and control process of the electronic parking system adopted by the present invention are simple, which can reduce the manufacturing and maintenance costs of the electronic parking system.

[0109] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0110] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for an electronic parking system, characterized in that, The electronic parking system includes: an air inlet, an air outlet, an exhaust outlet, a pressurizing solenoid valve, a depressurizing solenoid valve, a first electronically controlled valve, a first mechanical valve, and a proportional relay valve. The method includes the following steps: Receive parking control commands, including parking brake force detection control commands or trailer independent braking control commands; When the parking control command is the parking brake force detection control command, the first electronic control valve is energized, causing the air inlet and outlet of the first mechanical valve connected to the first electronic control valve to disconnect, thereby cutting off the air path between the first mechanical valve and the first end of the outlet connected to the first mechanical valve, thus cutting off the air path between the vehicle's spring brake chamber connected to the second end of the outlet. At the same time, the pressurization solenoid valve is energized, causing the air inlet and outlet of the proportional relay valve to be connected, so that the compressed air of the air inlet connected to the proportional relay valve enters the trailer brake control valve of the vehicle connected to the second end of the outlet through the first end of the outlet connected to the proportional relay valve, thereby realizing the parking brake force detection function. Alternatively, when the parking control command is the trailer independent braking control command, the first electronically controlled valve is energized to disconnect the air inlet and outlet of the first mechanical valve connected to the first electronically controlled valve, thereby cutting off the air path between the first mechanical valve and the first end of the outlet connected to the first mechanical valve's outlet. This cuts off the air path between the first mechanical valve and the vehicle's spring brake chamber connected to the second end of the outlet. Simultaneously, the pressure reducing solenoid valve is energized to connect the outlet and exhaust of the proportional relay valve, allowing the compressed air from the trailer brake control valve connected to the second end of the outlet to flow back into the proportional relay valve connected to the first end of the outlet through the outlet, and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thus realizing the trailer independent braking function.

2. The control method for the electronic parking system according to claim 1, characterized in that, The step of controlling the first electrically controlled valve to energize it, thereby disconnecting the inlet and outlet ends of the first mechanical valve connected to the first electrically controlled valve, includes: The first electrically controlled valve is energized, causing compressed air to enter the first mechanical valve connected to the outlet of the first electrically controlled valve through the air inlet connected to the air inlet end of the first electrically controlled valve, thereby shutting off the first mechanical valve and disconnecting the air inlet end from the air outlet end of the first mechanical valve.

3. The control method for the electronic parking system according to claim 1, characterized in that, The step of controlling the energization of the pressurizing solenoid valve to connect the inlet and outlet of the proportional relay valve includes: The pressurizing solenoid valve is energized, so that the compressed air connected to the air inlet of the pressurizing solenoid valve is filled into the control chamber of the proportional relay valve connected to the air outlet of the pressurizing solenoid valve, so that the air inlet and air outlet of the proportional relay valve are connected.

4. The control method for the electronic parking system according to claim 1, characterized in that, The step of controlling the energization of the pressure reducing solenoid valve to connect the outlet and exhaust ends of the proportional relay valve includes: The pressure reducing solenoid valve is energized, so that the compressed air in the control chamber of the proportional relay valve connected to the inlet end of the pressure reducing solenoid valve is released through the exhaust port connected to the outlet end of the pressure reducing solenoid valve, so that the outlet end and the exhaust end of the proportional relay valve are connected.

5. The control method for the electronic parking system according to claim 1, characterized in that, The parking control commands also include parking brake commands; When the parking control command is the parking brake command, the pressure reducing solenoid valve is energized, making the outlet and exhaust ends of the proportional relay valve connected. This allows the compressed air from the trailer brake control valve and the spring brake chamber of the vehicle, which are connected to the second end of the outlet, to flow back into the proportional relay valve connected to the first end of the outlet, and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thus realizing the parking brake function.

6. The control method for the electronic parking system according to claim 1, characterized in that, The parking control commands also include commands to release the parking brake. When the parking control command is the parking brake release command, the pressurization solenoid valve is energized, so that the inlet and outlet of the proportional relay valve are connected, thereby allowing compressed air to enter the trailer brake control valve and the spring brake chamber of the vehicle, which are connected to the second end of the outlet of the proportional relay valve, through the first end of the outlet connected to the outlet of the proportional relay valve, in order to realize the parking brake release function.

7. The control method for the electronic parking system according to claim 1, characterized in that, The electronic parking system also includes a pressure sensor, and the method further includes: Upon receiving the trailer independent braking control command, the air pressure at the air outlet is obtained; Adjusting the on / off time of the pressurizing solenoid valve and / or the depressurizing solenoid valve according to the air pressure at the outlet, thereby adjusting the output ratio of the proportional relay valve and thus regulating the braking force.

8. The control method for the electronic parking system according to claim 1, characterized in that, The electronic parking system further includes: a controller connected to the proportional relay valve, and the method further includes: Upon receiving an active release command, the inlet and outlet of the proportional relay valve are directly connected, allowing compressed air to enter the trailer brake control valve and the spring brake chamber of the vehicle, which are connected to the second end of the outlet of the proportional relay valve, through the first end of the outlet connected to the outlet of the proportional relay valve, thereby releasing the parking brake.

9. A control device for an electronic parking system, the electronic parking system comprising: The device includes an air inlet, an air outlet, an exhaust outlet, a pressurizing solenoid valve, a depressurizing solenoid valve, a first electrically controlled valve, a first mechanical valve, and a proportional relay valve. The receiving module receives parking control commands, which include parking brake force detection control commands or trailer independent braking control commands. The control module, when the parking control command is the parking brake force detection control command, controls the first electronic control valve to be energized, so that the air inlet end and air outlet end of the first mechanical valve connected to the first electronic control valve are disconnected, thereby cutting off the air passage between the first mechanical valve and the first end of the air outlet connected to the first mechanical valve, thereby cutting off the air passage between the vehicle's spring brake chamber connected to the second end of the air outlet. At the same time, the control module controls the pressurization solenoid valve to be energized, so that the air inlet end and air outlet end of the proportional relay valve are connected, thereby allowing the compressed air from the air inlet connected to the proportional relay valve to enter the vehicle's trailer brake control valve connected to the second end of the air outlet through the first end of the air outlet connected to the proportional relay valve, so as to realize the parking brake force detection function. Alternatively, when the parking control command is the trailer independent braking control command, the first electronically controlled valve is energized to disconnect the air inlet and outlet of the first mechanical valve connected to the first electronically controlled valve, thereby cutting off the air path between the first mechanical valve and the first end of the outlet connected to the first mechanical valve's outlet. This cuts off the air path between the first mechanical valve and the vehicle's spring brake chamber connected to the second end of the outlet. Simultaneously, the pressure reducing solenoid valve is energized to connect the outlet and exhaust of the proportional relay valve, allowing the compressed air from the trailer brake control valve connected to the second end of the outlet to flow back into the proportional relay valve connected to the first end of the outlet through the outlet, and be released from the exhaust port connected to the exhaust end of the proportional relay valve, thus realizing the trailer independent braking function.

10. A vehicle, characterized in that, include: The control device for the electronic parking system as described in claim 9.

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