Parking braking system and control method

Abstract

The invention discloses a parking braking system and a control method.The parking braking system comprises an oil tank, an execution element and a control assembly, the execution element comprises a brake cylinder, the control assembly comprises a pump assembly and an electromagnetic valve, the parking braking system further comprises a controller, and the pump assembly and the electromagnetic valve are both in control signal connection with the controller; the controller is in control signal connection with the whole vehicle control system, and the controller can receive a control instruction of the whole vehicle control system and control operation of the pump assembly and the electromagnetic valve according to the control instruction. The special controller for the parking control system is arranged, precise control over the pump assembly, the electromagnetic valve and other components is achieved through the controller, precise control over parking braking is achieved, the program loophole risk caused by direct control over the multiple components through the whole vehicle control system is reduced, and the stability and reliability of the parking braking system are improved. And the pump assembly and the controller are integrated into a module, so that the installation efficiency is improved, and the adaptability of the parking control system is improved.

Description

Technical Field

[0001] This invention relates to the field of parking brake technology, and in particular to a parking brake system and control method. Background Technology

[0002] The parking brake system in a vehicle control system is a key device for ensuring the stability of a vehicle in a parked state. Its core function is to prevent the vehicle from moving unexpectedly while parked or under specific operating conditions. Its most basic operating requirements are: when the vehicle is powered on, the parking brake system must automatically release the brake to meet the prerequisite for starting or moving the vehicle; when the vehicle is powered off, the parking brake system must promptly engage the brake to ensure that the vehicle remains stationary and avoid safety hazards.

[0003] A parking brake system typically consists of two parts: a control unit and an actuator unit. These two parts work together to achieve the functions of braking and releasing the brake. The core component of the actuator unit is the brake cylinder, which is the key element directly responsible for the braking action. The control unit mainly includes an oil pump and a solenoid valve, responsible for providing power to the brake cylinder and controlling the oil circuit status. The specific working logic is as follows: When the vehicle is powered on, the oil pump starts and supplies oil to the brake cylinder, driving the brake cylinder to release the parking brake. At this time, the solenoid valve remains normally closed. When the vehicle is powered off, the oil pump stops operating, the solenoid valve opens, the oil in the cylinder flows back to the oil reservoir, and the system automatically activates the parking brake.

[0004] In existing parking brake systems, the common control method is for the vehicle control system to directly send commands to independent control components such as oil pumps and solenoid valves, thereby controlling the power supply to and off of each component to achieve braking and release. However, this method has obvious limitations. The vehicle control system needs to process a large number of various commands related to the vehicle. Directly controlling multiple independent components will divert its control efforts, making it difficult to achieve precise control of the parking brake and potentially leading to problems similar to program vulnerabilities. Ultimately, this results in insufficient stability and reliability of the parking brake system.

[0005] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a parking brake system and control method. This system includes a controller that independently controls the parking control system according to instructions from the vehicle control system, significantly improving the control accuracy, stability, and reliability of the parking control system. Furthermore, by integrating the pump assembly and the controller into a module, the installation efficiency is improved, and the adaptability of the parking control system is enhanced.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A parking brake system includes a reservoir, an actuator, and a control assembly. The actuator includes a brake cylinder with a brake fluid chamber. The control assembly includes a pump assembly and a solenoid valve. The outlet of the pump assembly is connected to the brake fluid chamber of the brake cylinder, and the inlet of the pump assembly is connected to the reservoir. The solenoid valve has a first working port and a second working port. The first working port is connected to the brake fluid chamber of the brake cylinder, and the second working port is connected to the reservoir. When the solenoid valve is energized, the first working port and the second working port are disconnected. When the solenoid valve is de-energized, the first working port and the second working port are connected. The parking brake system also includes a controller. The pump assembly and the solenoid valve are both connected to the controller via control signals. The controller is connected to the vehicle control system via control signals. The controller can receive control commands from the vehicle control system and control the operation of the pump assembly and the solenoid valve according to the control commands.

[0008] Furthermore, the parking brake system includes an integrated base, in which the oil tank, solenoid valve, and pump assembly are all integrated. The parking brake system also includes a mounting base, which has a first mounting part and a second mounting part. The integrated base is fixedly connected to the first mounting part, and the controller is fixedly connected to the second mounting part.

[0009] Furthermore, the controller is electrically connected to the pump assembly, solenoid valve, and vehicle control system via a wiring harness assembly.

[0010] Furthermore, the pump assembly also includes a motor and a pump body. The extension direction of the oil tank is defined as a first direction. Along the first direction, the integrated base has a first end and a second end facing away from each other. The motor is disposed at the first end, the oil tank is disposed at the second end, and the pump body is disposed inside the oil tank. The integrated base has a first high-pressure oil port and a first low-pressure oil port. The first high-pressure oil port is connected to the oil outlet of the pump body, and the first low-pressure oil port is connected to the oil tank. The brake cylinder has a brake oil chamber and a balance oil chamber. The brake cylinder has a second high-pressure oil port connected to the brake oil chamber and a second low-pressure oil port connected to the balance oil chamber. The first high-pressure oil port and the second high-pressure oil port are correspondingly connected, and the first low-pressure oil port and the second low-pressure oil port are correspondingly connected.

[0011] Furthermore, the parking brake system includes an oil pressure sensor and / or an oil temperature sensor, both of which are integrated into the integrated housing; the oil pressure sensor can monitor the oil pressure in the brake fluid chamber, and the oil temperature sensor can monitor the oil temperature of the hydraulic oil flowing from the balance fluid chamber to the oil tank; the wiring harness assembly includes a first wiring harness for electrically connecting the controller to the oil pressure sensor, a second wiring harness for electrically connecting the controller to the oil temperature sensor, a third wiring harness for electrically connecting the controller to the solenoid valve, a fourth wiring harness for electrically connecting the controller to the pump assembly, and a fifth wiring harness for electrically connecting the controller to the vehicle control system.

[0012] Furthermore, the first high-pressure oil port and the first low-pressure oil port are respectively disposed on the peripheral sidewall of the integrated base; the first end of the integrated base is provided with an oil inlet, which is connected to the oil tank, and the first low-pressure oil port also serves as the vent of the oil tank.

[0013] Furthermore, the integrated base is internally provided with a first oil delivery pipe for connecting the oil inlet and the oil tank, a second oil delivery pipe for connecting the first low-pressure oil inlet and the oil tank, a third oil delivery pipe for connecting the first high-pressure oil inlet and the second oil delivery pipe, and a fourth oil delivery pipe for connecting the first high-pressure oil inlet and the oil outlet of the pump body. The oil pressure sensor is located in the fourth oil delivery pipe, and the solenoid valve and the oil temperature sensor are both located in the third oil delivery pipe.

[0014] Furthermore, the brake cylinder includes a cylinder body, a piston, a piston rod, and a compression spring. The cylinder body has a piston chamber, and the piston is slidably disposed within the piston chamber, dividing the piston chamber into a brake oil chamber and a balance oil chamber. The cylinder body has a first end, and the first end of the piston rod is fixedly connected to the piston. The second end of the piston rod extends out of the first end. The compression spring is sleeved on the outer periphery of the piston rod, and the compression spring is limited between the first end of the cylinder body and the second end of the piston rod. The compression spring ensures that the piston rod always has an extension tendency.

[0015] A control method based on the parking brake system includes a parking brake control method and a parking brake release control method; Parking brake control methods include: S1.1: The vehicle control system sends a parking brake command to the controller; S1.2: The controller energizes the solenoid valve; S1.3: The controller controls the pump assembly to be energized; S1.4: The brake cylinder performs the parking brake action; Methods for releasing the parking brake control include: S2.1: The vehicle control system sends a command to the controller to release the parking brake; S2.2: The controller controls the pump assembly to disconnect from power; S2.3: The controller de-energizes the solenoid valve; S2.4: The brake cylinder performs the action of releasing the parking brake.

[0016] With the above structure, the beneficial effects of the present invention are as follows: (1) The present invention provides a parking brake system and control method, wherein the parking brake system includes an oil tank, an actuator, and a control assembly. The actuator includes a brake cylinder, and the control assembly includes a pump assembly and a solenoid valve. The parking brake system also includes a controller, wherein the pump assembly and the solenoid valve are both connected to the controller via control signals. The controller is connected to the vehicle control system via control signals. The controller can receive control commands from the vehicle control system and control the operation of the pump assembly and the solenoid valve according to the control commands. The present invention provides a dedicated controller for the parking control system, which enables precise control of components such as the pump assembly and the solenoid valve. This achieves refined control of the parking brake and reduces the risk of program vulnerabilities caused by direct control of multiple components by the vehicle control system, thereby improving the stability and reliability of the parking brake system.

[0017] (2) The parking brake system and control method of the present invention include an integrated base, in which the oil tank, solenoid valve and pump assembly are all integrated. The parking brake system also includes a mounting base, which has a first mounting part and a second mounting part. The integrated base is fixedly connected to the first mounting part, and the controller is fixedly connected to the second mounting part. The present invention integrates the controller and pump assembly, reducing redundant wiring harnesses and pipeline connections, simplifying the installation process, reducing connection errors and installation costs, and achieving modular adaptation to improve the flexibility of the parking brake system. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the control component of the present invention; Figure 3 This is an exploded view of the pump assembly of the present invention; Figure 4This is a cross-sectional view of the pump assembly of the present invention. Figure 1 ; Figure 5 This is the invention Figure 4 Enlarged schematic diagram of the structure at point A; Figure 6 This is a cross-sectional view of the pump assembly of the present invention. Figure 2 ; Figure 7 This is a cross-sectional view of the pump assembly of the present invention. Figure 3 ; Figure 8 This is a cross-sectional view of the pump assembly of the present invention. Figure 4 ; Figure 9 This is a cross-sectional view of the pump assembly of the present invention. Figure 5 ; Figure 10 This is a cross-sectional view of the pump assembly of the present invention. Figure 6 ; Figure 11 This is a cross-sectional view of the brake cylinder of the present invention; Figure 12 This is the invention Figure 11 Enlarged schematic diagram of the structure at point B; Figure 13 This is a schematic diagram of the present invention; Figure 14 This is the control logic diagram (parking braking process) of the present invention. Figure 15 This is the control logic diagram of the present invention (the process of releasing the parking brake).

[0020] Figures 1 to 15 The winning number is: 1. Oil tank; 2. Brake cylinder; 21. Brake oil chamber; 22. Balance oil chamber; 23. Second high-pressure oil port; 24. Second low-pressure oil port; 25. Cylinder body; 26. Piston; 27. Piston rod; 28. Compression spring; 3. Pump assembly; 31. Pump body; 311. Input shaft; 32. Motor; 321. Output shaft; 322. Coupling; 323. Power input pin; 33. Integrated base; 331. First high-pressure oil port; 332. First low-pressure oil port; 333. Oil inlet; 4. Solenoid valve; 41. First working port; 4 2. Second working port; 5. Controller; 51. Protective plate; 6. Mounting base; 61. First mounting part; 62. Second mounting part; 63. Third mounting part; 7. Wiring harness assembly; 71. First wiring harness; 72. Second wiring harness; 73. Third wiring harness; 74. Fourth wiring harness; 741. Connector; 75. Fifth wiring harness; 8. Oil pressure sensor; 9. Oil temperature sensor; 10. First oil delivery pipeline; 20. Second oil delivery pipeline; 30. Third oil delivery pipeline; 40. Fourth oil delivery pipeline; 401. Check valve; 402. Overflow valve. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Where applicable, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 12 As shown, a parking brake system includes a reservoir 1, an actuator, and a control assembly. The actuator includes a brake cylinder 2 with a brake fluid chamber 21. The control assembly includes a pump assembly 3 and a solenoid valve 4. The outlet of the pump assembly 3 is connected to the brake fluid chamber 21 of the brake cylinder 2, and the inlet of the pump assembly 3 is connected to the reservoir 1. The solenoid valve 4 has a first working port 41 and a second working port 42. The first working port 41 is connected to the brake fluid chamber 21 of the brake cylinder 2, and the second working port 42 is connected to the reservoir 1. When the solenoid valve 4 is energized, the first working port 41 and the second working port 42 are disconnected. When the solenoid valve 4 is de-energized, the first working port 41 and the second working port 42 are connected. The parking brake system also includes a controller 5. The pump assembly 3 and the solenoid valve 4 are both connected to the controller 5 via control signals. The controller 5 is connected to the vehicle control system via control signals. The controller 5 can receive control commands from the vehicle control system and control the operation of the pump assembly 3 and the solenoid valve 4 according to the control commands.

[0029] Based on the above embodiments, the present invention provides a parking brake system, which includes an oil tank 1, an actuator, and a control component. The actuator includes a brake cylinder 2, and the control component includes a pump assembly 3 and a solenoid valve 4. The parking brake system also includes a controller 5. The pump assembly 3 and the solenoid valve 4 are both connected to the controller 5 via control signals. The controller 5 is connected to the vehicle control system via control signals. The controller 5 can receive control commands from the vehicle control system and control the operation of the pump assembly 3 and the solenoid valve 4 according to the control commands. The present invention provides a dedicated controller 5 for the parking control system. Through the controller 5, precise control of components such as the pump assembly 3 and the solenoid valve 4 is achieved, which not only achieves refined control of the parking brake but also reduces the risk of program vulnerabilities caused by direct control of multiple components by the vehicle control system, thereby improving the stability and reliability of the parking brake system. The first direction is the height direction of the oil tank 1, such as... Figure 4 As shown.

[0030] In another preferred embodiment of the present invention, the parking brake system includes an integrated base 33, in which the oil tank 1, solenoid valve 4, and pump assembly 3 are all integrated. The parking brake system also includes a mounting base 6, which has a first mounting portion 61 and a second mounting portion 62. The integrated base 33 is fixedly connected to the first mounting portion 61, and the controller 5 is fixedly connected to the second mounting portion 62. In this embodiment, as... Figure 1 and Figure 2 As shown, the oil tank 1, solenoid valve 4, and pump assembly 3 are all integrated into the integrated base 33. The integrated base 33 is fixedly installed to the first mounting part 61 of the mounting base 6, and the controller 5 is fixedly installed to the second mounting part 62 of the mounting base 6. The mounting base 6 also has a third mounting part 63, through which the mounting base 6 is installed to the vehicle. This highly integrated design reduces redundant wiring harnesses and pipe connections, simplifies the installation process, reduces connection errors and installation costs, achieves modular adaptation, and improves the flexibility of parking brake system adaptation. In a further embodiment, the controller 5 is provided with a protective plate 51, which is used to protect the controller 5.

[0031] In another preferred embodiment of the present invention, the controller 5 is electrically connected to the pump assembly 3, the solenoid valve 4, and the vehicle control system via a wiring harness assembly 7. The parking brake system includes an oil pressure sensor 8 and / or an oil temperature sensor 9, both integrated into the integrated housing 33. The oil pressure sensor 8 monitors the oil pressure within the brake fluid chamber 21, and the oil temperature sensor 9 monitors the temperature of the hydraulic oil flowing from the balance chamber 22 to the oil tank 1. The wiring harness assembly 7 includes a first wiring harness 71 for electrically connecting the controller 5 to the oil pressure sensor 8, a second wiring harness 72 for electrically connecting the controller 5 to the oil temperature sensor 9, a third wiring harness 73 for electrically connecting the controller 5 to the solenoid valve 4, a fourth wiring harness 74 for electrically connecting the controller 5 to the pump assembly 3, and a fifth wiring harness 75 for electrically connecting the controller 5 to the vehicle control system. The oil pressure sensor 8 is located in the fourth oil supply pipe 40, and the oil temperature sensor 9 is located in the third oil supply pipe 30. In this embodiment, as... Figure 7 and Figure 8 As shown, the oil pressure sensor 8 can monitor the oil pressure in the brake oil chamber 21 and feed back the oil pressure value to the controller 5. The controller 5 performs corresponding control operations based on the value fed back by the oil pressure sensor 8. The oil temperature sensor 9 can monitor the oil temperature of the hydraulic oil flowing from the balance oil chamber 22 to the oil tank 1 for fault monitoring. When the oil temperature sensor 9 detects that the oil temperature exceeds the set value, it feeds back to the controller 5. The controller 5 determines that the parking brake system has malfunctioned and activates the parking brake to facilitate maintenance by the personnel.

[0032] As another preferred embodiment of the present invention, the pump assembly 3 further includes a motor 32 and a pump body 31. The extension direction of the oil tank 1 is defined as a first direction. Along the first direction, the integrated base 33 has a first end and a second end facing away from each other. The motor 32 is disposed at the first end, the oil tank 1 is disposed at the second end, and the pump body 31 is disposed inside the oil tank 1. The integrated base 33 has a first high-pressure oil port 331 and a first low-pressure oil port 332. The first high-pressure oil port 331 communicates with the oil outlet of the pump body 31, and the first low-pressure oil port 332 communicates with the oil tank 1. The brake cylinder 2 has a brake oil chamber 21 and a balance oil chamber 22. The brake cylinder 2 has a second high-pressure oil port 23 communicating with the brake oil chamber 21 and a second low-pressure oil port 24 communicating with the balance oil chamber 22. The first high-pressure oil port 331 and the second high-pressure oil port 23 are correspondingly connected, and the first low-pressure oil port 332 and the second low-pressure oil port 24 are correspondingly connected. The pump body 31 is a gear pump. In this embodiment, as... Figure 4As shown, the pump assembly 3 of the present invention is vertically installed, with the oil tank 1 located at the bottom, reducing the risk of oil leakage at the connection between the oil tank 1 and the integrated base 33. Furthermore, the vertical installation design also prevents hydraulic oil in the oil tank 1 from seeping into electronic components such as the motor 32, thus avoiding problems such as poor contact and poor heat dissipation caused by hydraulic oil seeping into electronic components, and improving the stability of the brake pump operation. In this embodiment, as... Figure 10 As shown, the output shaft 321 of the motor 32 and the input shaft 311 of the pump body 31 both extend into the integrated base 33, and are connected by a coupling 322 within the integrated base 33. This connection via the coupling 322 balances transmission stability and installation adaptability. The coupling 322 absorbs transmission shocks and vibrations to ensure smooth equipment operation, and can accommodate installation deviations between the two shafts, reducing assembly precision requirements.

[0033] In further optimized implementations, such as Figure 2 and Figure 3 As shown, the motor 32 is equipped with a power input pin 323, and the fourth wiring harness 74 is equipped with a connector 741 that mates with the power input pin 323. The connector 741 has a mating hole that matches the power input pin 323, and a sealing ring (not shown) is provided between the mating hole and the power input pin 323. The connection between the power input pin 323 and the connector 741 is waterproof. During connection, the power input pin 323 is completely contained within the connector 741, and the sealing ring enhances the sealing performance, achieving waterproofing and preventing short circuits when the unmanned tractor is working outdoors.

[0034] In another preferred embodiment of the present invention, the first high-pressure oil port 331 and the first low-pressure oil port 332 are respectively disposed on the peripheral sidewall of the integrated base 33; the first end of the integrated base 33 is provided with an oil inlet 333, which communicates with the oil tank 1, and the first low-pressure oil port 332 also serves as the vent port of the oil tank 1. In this embodiment, as... Figure 3 and Figure 4 As shown, when oil is injected into the oil tank 1 through the oil inlet 333, the gas inside the oil tank 1 is discharged from the first low-pressure oil inlet 332. This not only facilitates the smooth injection of hydraulic oil, but also allows for precise judgment of whether the oil tank 1 is full of hydraulic oil by observing whether hydraulic oil flows out of the first low-pressure oil inlet 332. Using the first low-pressure oil inlet 332 as a vent not only simplifies the processing technology and saves production costs, but also reduces the risk of oil leakage.

[0035] In another preferred embodiment of the present invention, the integrated base 33 is internally provided with a first oil supply pipe 10 for connecting the oil inlet 333 and the oil tank 1, a second oil supply pipe 20 for connecting the first low-pressure oil inlet 332 and the oil tank 1, a third oil supply pipe 30 for connecting the first high-pressure oil inlet 331 and the second oil supply pipe 20, and a fourth oil supply pipe 40 for connecting the first high-pressure oil inlet 331 and the oil outlet of the pump body 31. The oil pressure sensor 8 is disposed in the fourth oil supply pipe 40, and the solenoid valve 4 and the oil temperature sensor 9 are both disposed in the third oil supply pipe 30. A one-way valve 401 is disposed on the fourth oil supply pipe 40, which allows hydraulic oil to flow only from the oil outlet of the pump body 31 to the first high-pressure oil inlet 331; an overflow valve 402 is disposed between the oil outlet of the pump body 31 and the one-way valve 401. In this embodiment, as shown... Figure 9 As shown, the one-way valve 401 is designed to prevent hydraulic oil from flowing back to the pump body 31. The relief valve 402 is used to protect the system. Specifically, when the oil pressure in the brake oil chamber 21 of the brake cylinder 2 is greater than the set value, the working hydraulic oil will not enter the first high-pressure oil port 331 through the one-way valve 401, but will flow back directly to the oil tank 1 through the relief valve 402, thus avoiding the problem of brake cylinder 2 being damaged due to excessive pressure.

[0036] In another preferred embodiment of the present invention, the brake cylinder 2 includes a cylinder body 25, a piston 26, a piston rod 27, and a compression spring 28. The cylinder body 25 has a piston chamber, and the piston 26 is slidably disposed within the piston chamber, dividing the piston chamber into a brake oil chamber 21 and a balance oil chamber 22. The cylinder body 25 has a first end, and the first end of the piston rod 27 is fixedly connected to the piston 26. The second end of the piston rod 27 extends beyond the first end. The compression spring 28 is sleeved on the outer periphery of the piston rod 27, and is positioned between the first end of the cylinder body 25 and the second end of the piston rod 27. The compression spring 28 ensures that the piston rod 27 always has a tendency to extend. In this embodiment, as... Figure 11 and 12As shown, when oil is supplied to the brake fluid chamber 21 through the second high-pressure oil port 23, the piston 26 drives the piston rod 27 to retract against the elastic force of the compression spring 28 until the brake fluid chamber 21 is full of oil. The piston 26 then drives the piston rod 27 to retract to its limit position, achieving parking brake operation. When oil supply to the brake fluid chamber 21 stops, the piston rod 27 extends under the elastic force of the compression spring 28, and the piston 26 moves with the piston rod 27. The hydraulic oil in the brake fluid chamber 21 is discharged from the second high-pressure oil port 23 until the oil in the brake fluid chamber 21 is emptied. The piston rod 27 then extends to its limit position, releasing the parking brake. In this invention, because the brake fluid chamber 21 has a smaller volume than the balance chamber 22, the time required for it to fill and empty is shorter. Therefore, the brake cylinder 2 of this invention responds faster to parking brake operation and release, which is more conducive to safe driving. In this embodiment, the compression spring 28 is sleeved on the outer periphery of the piston rod 27 and located at the portion of the piston rod 27 extending out of the piston cavity. The compression spring 28 is confined between the first end of the cylinder body 25 and the second end of the piston rod 27. In conventional brake cylinders, the compression spring is installed inside the brake fluid cavity, which is connected to the outside gas. Foreign matter can easily enter the cavity with the airflow, leading to corrosion or damage to the piston seal. After damage, foreign matter can further invade the rodless cavity, contaminating the hydraulic oil. When the hydraulic oil flows back into the system, it can cause instability in the entire system. At the same time, the compression spring is prone to generating debris during repeated compression and recovery in the rod cavity, which can also affect the stability of the system. In this invention, the compression spring 28 is located outside the cylinder body 25, which allows for better sealing between the inside of the cylinder body 25 and the outside, preventing external air from entering the piston cavity. Furthermore, both the brake fluid cavity 21 and the balance fluid cavity 22 are filled with hydraulic oil, which helps to extend the service life of the piston 26.

[0037] See Figures 13 to 15 The present invention also provides a control method based on the parking brake system, including a parking brake control method and a parking brake release control method; Parking brake control methods include: S1.1: The vehicle control system sends a parking brake command to the controller 5; S1.2: The controller 5 controls the solenoid valve 4 to be energized; S1.3: The controller 5 controls the pump assembly 3 to be energized; S1.4: The brake cylinder 2 performs the parking brake action; Methods for releasing the parking brake control include: S1.1: The vehicle control system sends a command to the controller 5 to release the parking brake; S2.2: The controller 5 controls the pump assembly 3 to disconnect from power; S2.3: The controller 5 controls the solenoid valve 4 to de-energize; S2.4: The brake cylinder 2 performs the action of releasing the parking brake.

[0038] This invention provides a control method based on the parking brake system, the control method including a parking brake control method and a parking brake release control method. The method for releasing the parking brake is as follows: When the vehicle needs to move, the vehicle control system sends a command to the controller 5 to release the parking brake. The controller 5 receives the command from the vehicle control system, energizes the solenoid valve 4, disconnects the first working port 41 and the second working port 42, and controls the pump body 31 to start working. The pump body 31 injects high-pressure oil into the brake oil chamber 21 of the brake cylinder 2. When the oil pressure sensor 8 detects that the pressure in the brake oil chamber 21 reaches the upper limit of the set value (e.g., 12MPa), the controller 5 controls the pump body 31 to stop working. The controller 5 keeps the solenoid valve 4 energized. At this time, the brake oil chamber 21 of the brake cylinder 2 maintains pressure, keeping the vehicle in the state of releasing the parking brake. During vehicle operation, if the oil pressure sensor 8 detects that the pressure of the brake oil chamber 21 of the brake cylinder 2 is lower than the lower limit of the set value (e.g., 8MPa), the pump body 31 starts to inject oil into the brake oil chamber 21 of the brake cylinder 2. When the oil pressure sensor 8 detects that the pressure of the brake oil chamber 21 reaches the upper limit of the set value (e.g., 12MPa), the controller 5 controls the pump body 31 to stop working, keeping the vehicle in the state of releasing the parking brake.

[0039] The parking brake control method is as follows: when the vehicle needs to stop or the power is suddenly cut off, the solenoid valve 4 is de-energized, the first working port 41 and the second working port 42 are connected, the hydraulic oil in the brake oil chamber 21 of the brake cylinder 2 flows back to the oil tank 1 from the first working port 41 and the second working port 42, and the piston rod 27 extends under the elastic force of the compression spring 28 to realize the parking brake.

[0040] As another preferred embodiment of the present invention, the oil temperature sensor 9 monitors the oil temperature of the hydraulic oil flowing from the balance oil chamber 22 to the oil tank 1. When the oil temperature sensor 9 detects that the oil temperature exceeds the set value, the controller 5 determines that the parking brake system has malfunctioned and activates the parking brake so that the staff can stop the vehicle for maintenance.

[0041] In another preferred embodiment of the present invention, the controller 5 monitors the time T required from the start of operation of the pump body 31 to the oil pressure in the brake oil chamber 21 reaching a set upper limit value. When T exceeds the set time t, the controller 5 determines that the parking brake system has malfunctioned and activates the parking brake to facilitate maintenance by the personnel. That is, if the parking brake is not released within the set time t, the controller 5 determines that the parking brake system has malfunctioned.

[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A parking brake system, characterized in that: The parking brake system includes an oil tank (1), an actuator, and a control assembly. The actuator includes a brake cylinder (2) having a brake fluid chamber (21). The control assembly includes a pump assembly (3) and a solenoid valve (4). The outlet of the pump assembly (3) is connected to the brake fluid chamber (21) of the brake cylinder (2), and the inlet of the pump assembly (3) is connected to the oil tank (1). The solenoid valve (4) has a first working port (41) and a second working port (42). The first working port (41) is connected to the brake fluid chamber (21) of the brake cylinder (2), and the second working port (42) is connected to the brake fluid chamber (21) of the brake cylinder (2). The oil tank (1) is connected. When the solenoid valve (4) is energized, the first working port (41) and the second working port (42) are disconnected. When the solenoid valve (4) is de-energized, the first working port (41) and the second working port (42) are connected. The parking brake system also includes a controller (5). The pump assembly (3) and the solenoid valve (4) are both connected to the controller (5) via control signals. The controller (5) is connected to the vehicle control system via control signals. The controller (5) can receive control commands from the vehicle control system and control the operation of the pump assembly (3) and the solenoid valve (4) according to the control commands.

2. A parking brake system according to claim 1, characterized in that: The parking brake system includes an integrated base (33), in which the oil tank (1), solenoid valve (4) and pump assembly (3) are all integrated. The parking brake system also includes a mounting base (6), which has a first mounting part (61) and a second mounting part (62). The integrated base (33) is fixedly connected to the first mounting part (61), and the controller (5) is fixedly connected to the second mounting part (62).

3. A parking brake system according to claim 1 or 2, characterized in that: The controller (5) is electrically connected to the pump assembly (3), the solenoid valve (4) and the vehicle control system via the wiring harness assembly (7).

4. A parking brake system according to claim 3, characterized in that: The pump assembly (3) further includes a motor (32) and a pump body (31). The extension direction of the oil tank (1) is defined as a first direction. Along this first direction, the integrated base (33) has a first end and a second end facing away from each other. The motor (32) is located at the first end, the oil tank (1) is located at the second end, and the pump body (31) is located inside the oil tank (1). The integrated base (33) has a first high-pressure oil port (331) and a first low-pressure oil port (332). The first high-pressure oil port (331)... The first low-pressure oil port (332) is connected to the oil tank (1) and the oil outlet of the pump body (31). The brake cylinder (2) has the brake oil chamber (21) and the balance oil chamber (22). The brake cylinder (2) has a second high-pressure oil port (23) connected to the brake oil chamber (21) and a second low-pressure oil port (24) connected to the balance oil chamber (22). The first high-pressure oil port (331) is connected to the second high-pressure oil port (23) and the first low-pressure oil port (332) is connected to the second low-pressure oil port (24).

5. A parking brake system according to claim 4, characterized in that: The parking brake system includes an oil pressure sensor (8) and / or an oil temperature sensor (9), both of which are integrated into the integrated base (33). The oil pressure sensor (8) can monitor the oil pressure in the brake oil chamber (21), and the oil temperature sensor (9) can monitor the oil temperature of the hydraulic oil flowing from the balance oil chamber (22) to the oil tank (1). The wiring harness assembly (7) includes a first wiring harness (71) for electrically connecting the controller (5) to the oil pressure sensor (8), a second wiring harness (72) for electrically connecting the controller (5) to the oil temperature sensor (9), a third wiring harness (73) for electrically connecting the controller (5) to the solenoid valve (4), a fourth wiring harness (74) for electrically connecting the controller (5) to the pump assembly (3), and a fifth wiring harness (75) for electrically connecting the controller (5) to the vehicle control system.

6. A parking brake system according to claim 5, characterized in that: The first high-pressure oil port (331) and the first low-pressure oil port (332) are respectively disposed on the peripheral side wall of the integrated base (33); the first end of the integrated base (33) is provided with an oil inlet (333), the oil inlet (333) is connected to the oil tank (1), and the first low-pressure oil port (332) also serves as the exhaust port of the oil tank (1).

7. A parking brake system according to claim 6, characterized in that: The integrated base (33) is provided with a first oil pipeline (10) for connecting the oil inlet (333) and the oil tank (1), a second oil pipeline (20) for connecting the first low-pressure oil inlet (332) and the oil tank (1), a third oil pipeline (30) for connecting the first high-pressure oil inlet (331) and the second oil pipeline (20), and a fourth oil pipeline (40) for connecting the first high-pressure oil inlet (331) and the oil outlet of the pump body (31). The oil pressure sensor (8) is located in the fourth oil pipeline (40), and the solenoid valve (4) and the oil temperature sensor (9) are both located in the third oil pipeline (30).

8. A parking brake system according to claim 1, characterized in that: The brake cylinder (2) includes a cylinder body (25), a piston (26), a piston rod (27), and a compression spring (28). The cylinder body (25) has a piston chamber. The piston (26) is slidably disposed in the piston chamber and divides the piston chamber into a brake oil chamber (21) and a balance oil chamber (22). The cylinder body (25) has a first end. The first end of the piston rod (27) is fixedly connected to the piston (26). The second end of the piston rod (27) extends out of the first end. The compression spring (28) is sleeved on the outer periphery of the piston rod (27) and is limited to the first end of the cylinder body (25) and the second end of the piston rod (27). The compression spring (28) makes the piston rod (27) always have an extension tendency.

9. A control method for a parking brake system according to any one of claims 1-8, characterized in that: This includes parking brake control methods and parking brake release control methods; Parking brake control methods include: S1.1: The vehicle control system sends a parking brake command to the controller (5); S1.2: The controller (5) controls the solenoid valve (4) to be energized; S1.3: The controller (5) controls the pump assembly (3) to be energized; S1.4: The brake cylinder (2) performs the parking brake action; Methods for releasing the parking brake control include: S1.1: The vehicle control system sends a command to the controller (5) to release the parking brake; S2.2: The controller (5) controls the pump assembly (3) to disconnect from power; S2.3: The controller (5) controls the solenoid valve (4) to de-energize; S2.4: The brake cylinder (2) performs the action of releasing the parking brake.

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