Valve washing method, valve washing device and electronic hydraulic brake system

Abstract

The embodiment of the present invention proposes a valve washing method, a valve washing device and an electronic hydraulic brake system. When the whole vehicle is powered off, the electronic hydraulic brake system automatically enters a power supply holding state, and the valve washing process is triggered at this time. The CSV valve is first controlled to close and the PSV valve is opened, and then the pressure-building cylinder is controlled to build pressure, so that the oil in the pressure-building cylinder flows into the wheel end through the PSV valve and the IV valve. When it is detected that the hydraulic pressure of the pressure-building cylinder remains stable, the PSV valve is controlled to close to maintain the pressure, and then the OV valve is controlled to open to release the pressure, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow. After the set opening time of the OV valve is reached, the OV valve is controlled to close, and the pressure-building cylinder is controlled to replenish the fluid. In this way, the valve washing process is performed every time the whole vehicle is powered off, and the valve body is flushed by the liquid flow to take foreign matter away from the valve hole, thereby significantly reducing the accumulation of foreign matter and impurities in the valve hole, improving the performance of the electronic hydraulic brake system, and further improving the safety of the whole vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle braking, and in particular to a valve washing method, a valve washing device and an electronic hydraulic braking system. Background Art

[0002] Integrated Electronic Hydraulic Braking (iEHB) is an advanced automotive braking technology, which is widely used in the automotive field. For iEHB, during continuous use, certain debris and other foreign matter will accumulate in the flow channel. These debris mainly come from the wear of the piston during movement. When the piston moves in the fluid, the friction between its surface and the fluid will cause the wear of trace materials. These wear particles will flow into the flow channel with the fluid.

[0003] Over time, during the continuous pressure buildup and pressure relief process, these wear particles will gradually accumulate in the flow channel. If they are not cleaned in time, they may cause valve blockage. Valve blockage not only affects the normal flow of the fluid, but may also cause the performance of the hydraulic system to deteriorate, such as slowing down the pressure buildup rate or even failing to build pressure, which will directly affect the braking performance and thus the safety of the entire vehicle. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a valve washing method, a valve washing device and an electronic hydraulic brake system to solve the above-mentioned problems.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0006] In a first aspect, the present invention provides a valve washing method, which is applied to a controller of an electronic hydraulic brake system, wherein the controller is electrically connected to a pressure-building cylinder, a PSV valve, a CSV valve, an IV valve, and an OV valve of the electronic hydraulic brake system, respectively, and the method comprises:

[0007] When it is detected that the vehicle is powered off, the CSV valve is controlled to close and the PSV valve is controlled to open;

[0008] Controlling the pressure building cylinder to build pressure, so that the oil in the pressure building cylinder flows into the wheel end through the PSV valve and the IV valve;

[0009] When it is detected that the hydraulic pressure of the pressure building cylinder remains stable, controlling the PSV valve to close;

[0010] After the PSV valve is closed, the OV valve is controlled to open for pressure relief, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow;

[0011] After the set opening time of the OV valve is reached, the OV valve is controlled to close, and the pressure building cylinder is controlled to replenish fluid;

[0012] After the pressure-building cylinder is replenished with fluid, controlling the PSV valve to reopen;

[0013] Return to the step of controlling the pressure building cylinder to build pressure until the valve washing times reaches the set value, and end the valve washing process.

[0014] Optionally, the controller is electrically connected to a motor of the pressure building cylinder to control the pressure building cylinder to perform fluid replenishment, including:

[0015] According to the first set torque, the motor is controlled to rotate reversely and forwardly alternately to replenish the pressure building cylinder with fluid for multiple times until the replenishment is completed;

[0016] Alternatively, according to the second set torque, the motor is controlled to rotate in reverse, so as to replenish the pressure building cylinder with fluid once so that the replenishment is completed;

[0017] Wherein, the first set torque is smaller than the second set torque.

[0018] Optionally, the method further comprises:

[0019] When it is detected that the vehicle is powered on again or the brake pedal is displaced, it is determined whether the electronic hydraulic brake system is currently in the pressure-building cylinder fluid-replenishing stage;

[0020] If yes, the motor is controlled to reverse according to the maximum set torque to replenish the pressure-building cylinder with fluid, thereby ending the valve washing process;

[0021] If not, the valve cleaning process ends directly.

[0022] Optionally, before controlling the CSV valve to close and the PSV valve to open, the method further includes:

[0023] The IV valve is controlled to be closed according to a set current, so as to control the IV valve to reopen after the solenoid valve of the IV valve is magnetized, wherein the set current is greater than the normal working current of the IV valve.

[0024] Optionally, there are four wheel ends, four IV valves and four OV valves respectively, there are two PSV valves, the pressure building cylinder is connected to two PSV valves respectively, one PSV valve is connected to two wheel ends through two IV valves respectively, and one wheel end is connected to an oil tank through one OV valve;

[0025] The step of controlling the CSV valve to close and the PSV valve to open comprises:

[0026] Acquire the braking response time of each wheel end when braking occurs in the electronic hydraulic braking system;

[0027] From all the wheel ends, determining each target wheel end whose braking response time is greater than a set threshold;

[0028] Controlling the CSV valve to be closed, the PSV valve corresponding to each of the target wheel ends to be opened, and the IV valve corresponding to each of the other wheel ends except all of the target wheel ends to be closed;

[0029] The step of controlling the OV valve to open for pressure relief comprises:

[0030] The OV valve corresponding to each target wheel end is controlled to open for pressure relief.

[0031] Optionally, there are four OV valves; the step of controlling the OV valves to open for pressure relief comprises:

[0032] Control all the OV valves to open simultaneously for pressure relief;

[0033] The step of controlling the OV valve to close comprises:

[0034] According to the set sequence, each of the OV valves is controlled to close in turn.

[0035] Optionally, the controller is also electrically connected to a TSV valve and an SSV valve of the electronic hydraulic brake system, respectively, and the method further includes:

[0036] When it is detected that the vehicle is powered off or the pressure-building cylinder is replenished, the CSV valve is controlled to open, the PSV valve is controlled to open, and the IV valve is controlled to close;

[0037] Controlling the pressure-building cylinder to build pressure, so that the oil in the pressure-building cylinder flows into the master cylinder of the electronic hydraulic brake system through the PSV valve and the CSV valve;

[0038] When it is detected that the hydraulic pressure of the pressure-building cylinder remains stable, the PSV valve is controlled to close so that the oil flows out of the master cylinder through the TSV valve;

[0039] Alternatively, when it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to be closed, the TSV valve is controlled to be closed, and the SSV valve is controlled to be opened, so that the oil flows out of the master cylinder through the SSV valve.

[0040] In a second aspect, the present invention further provides a valve washing device, which is applied to a controller of an electronic hydraulic brake system, wherein the controller is electrically connected to a pressure-building cylinder, a PSV valve, a CSV valve, an IV valve and an OV valve of the electronic hydraulic brake system, respectively, and the device comprises:

[0041] A valve body control module, used for controlling the CSV valve to close and the PSV valve to open when it is detected that the vehicle is powered off;

[0042] A pressure building control module, used for controlling the pressure building cylinder to build pressure, so that the oil in the pressure building cylinder flows into the wheel end through the PSV valve and the IV valve;

[0043] The valve body control module is further used to control the PSV valve to close when it is detected that the hydraulic pressure of the pressure building cylinder remains stable;

[0044] A pressure relief control module, used for controlling the OV valve to open for pressure relief after the PSV valve is closed, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow;

[0045] A liquid replenishment control module, used to control the OV valve to close after the set opening time of the OV valve is reached, and control the pressure building cylinder to replenish liquid;

[0046] The valve washing control module is used to control the PSV valve to reopen after the pressure building cylinder is replenished with fluid; return to execute the step of controlling the pressure building cylinder to build pressure until the valve washing times reaches the set value, thereby ending the valve washing process.

[0047] In a third aspect, the present invention further provides an electronic hydraulic brake system, comprising a controller, wherein the controller is used to execute the valve washing method in the first aspect.

[0048] The embodiment of the present invention provides a valve washing method, a valve washing device and an electronic hydraulic brake system. When the whole vehicle is powered off, the electronic hydraulic brake system automatically enters a power supply holding state, at which time the valve washing process is triggered, first controlling the CSV valve to close and the PSV valve to open, and then controlling the pressure building cylinder to build pressure, so that the oil in the pressure building cylinder flows into the wheel end through the PSV valve and the IV valve. When it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to close. At this time, since the CSV valve and the PSV valve are both closed, the oil can be sealed between the CSV valve, the PSV valve and the wheel end to maintain the pressure. After that, the OV valve is controlled to open for pressure relief, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow. After the set opening time of the OV valve is reached, the OV valve is controlled to close, and the pressure building cylinder is controlled to replenish fluid to replenish the oil that has been unloaded, thereby ensuring that the circuit oil is sufficient. In this way, the valve cleaning process is performed every time the vehicle is powered off. The valve body is flushed by liquid flow, and foreign matter is removed from the valve hole, thereby significantly reducing the accumulation of foreign matter and impurities in the valve hole, improving the performance of the electronic hydraulic braking system, and thus improving the safety of the entire vehicle.

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 A structural schematic diagram of an electronic hydraulic brake system provided by an embodiment of the present invention is shown.

[0052] Figure 2 A block diagram of a controller provided by an embodiment of the present invention is shown.

[0053] Figure 3 The flow chart of a valve washing method provided by an embodiment of the present invention is shown as follows Figure 1 .

[0054] Figure 4 The flow chart of a valve washing method provided by an embodiment of the present invention is shown as follows Figure 2 .

[0055] Figure 5 A block diagram of a valve washing device provided by an embodiment of the present invention is shown.

[0056] Icons: 10-electronic hydraulic braking system; 11-oil tank module; 12-main braking circuit; 13-mechanical braking circuit; 14-wheel end module; 121-pressure building cylinder; 1211-piston; 1212-pressure building chamber; 1213-motor; 122-pressure sensor; 20-controller; 21-memory; 22-processor; 23-communication module; 100-valve washing device; 101-valve body control module; 102-pressure building control module; 103-pressure relief control module; 104-fluid replenishment control module; 105-valve washing control module. DETAILED DESCRIPTION

[0057] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0058] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0059] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0060] In order to make the technical solution easier to understand, before introducing the valve washing method provided in the embodiment of the present invention, the electronic hydraulic brake system is first introduced.

[0061] like Figure 1 As shown, the electronic hydraulic brake system 10 includes an oil tank module 11, a main brake circuit 12, a mechanical brake circuit 13, a TSV (Throttle Valve), a SSV (Shut-off Valve), a wheel end module 14 and a controller (not shown in the figure). The main brake circuit 12 and the mechanical brake circuit 13 are respectively connected to the oil tank module 11 and the wheel end module 14. The main brake circuit 12 and the mechanical brake circuit 13 can use the oil provided by the oil tank module 11 to generate hydraulic pressure and transmit it to the wheel end module 14 to control vehicle braking.

[0062] The oil pot module 11 includes a large oil pot and a small oil pot. The large oil pot is used to store oil and provide stable pressure buffering, and the small oil pot is used to achieve fine hydraulic control and rapid response.

[0063] The main brake circuit 12 includes a pressure building cylinder 121, two PSVs (Pressure Relief Valves) (i.e., PSV1 and PSV2 in the figure) and a pressure sensor 122, and the wheel-end module 14 includes four IVs (Isolating Valves) (i.e., IV1F, IV1R, IV2F, IV2R in the figure), four wheel ends (1F, 1R, 2F, 2R in the figure) and four OVs (Overflow Valves) (i.e., OV1F, OV1R, OV2F, OV2R in the figure). The pressure building cylinder 121 is respectively connected to two PSV valves, one PSV valve is connected to two wheel ends through two IV valves, and one wheel end is connected to a small oil pot through an OV valve, that is, PSV1 is connected to 1F and 1R through IV1F and IV1R, PSV2 is connected to 2F and 2R through IV2F and IV2R, and 1F, 1R, 2F and 2R are connected to a small oil pot through OV1F, OV1R, OV2F and OV2R, respectively.

[0064] The pressure-building cylinder 121 includes a piston 1211, a pressure-building chamber 1212, and a motor 1213. The pressure-building chamber 1212 is connected to a small oil pot through a one-way valve. When the motor 1213 rotates, it can drive the piston 1211 to move in the pressure-building chamber 1212, so that the oil in the pressure-building chamber 1212 can flow out or the oil in the small oil pot can flow into the pressure-building chamber 1212. The pressure sensor 122 is used to collect the hydraulic pressure of the pressure-building cylinder 121 in real time.

[0065] In the wheel end module 14, two IV valves, two wheel ends and two OV valves constitute a wheel group. The mechanical brake circuit 13 includes a brake pedal, a master cylinder and two CSVs (Control Solenoid Valve, control solenoid valves) (i.e., CSV1 and CSV2 in the figure), the brake pedal is connected to the master cylinder, the master cylinder is connected to PSV1 and the first wheel group through CSV1, and is connected to PSV1 and the second wheel group through CSV2, and the master cylinder is also connected to a small oil pot through a TSV valve and an SSV valve respectively.

[0066] The controller can be electrically connected to the motor 1213 of the pressure building cylinder 121, the PSV valve, CSV valve, IV valve, OV valve, TSV valve, SSV valve and various isolation valves of other modules and devices requiring electrical control through the bus to control the working state of the motor 1213 and the conduction and disconnection of each isolation valve.

[0067] Among the above isolation valves, TSV valve, CSV valve and IV valve are normally open valves, and SSV valve, PSV valve and OV valve are normally closed valves. In the power-off state, TSV valve, CSV valve and IV valve are open, and SSV valve, PSV valve and OV valve are closed. In the power-on state, TSV valve, CSV valve and IV valve are closed, and SSV valve, PSV valve and OV valve are open.

[0068] When the vehicle has a mechanical braking demand, that is, the driver steps on the brake pedal, the TSV valve, CSV valve and IV valve are opened, the PSV valve and OV valve are closed, the pressure building cylinder 121 and the wheel end are in a closed state, and the oil in the small oil pot flows into the master cylinder through the TSV valve to generate hydraulic pressure. The master cylinder transmits the hydraulic pressure to the two wheel groups through the two CSV valves to achieve vehicle braking.

[0069] When the vehicle is powered off, the electronic hydraulic brake system automatically enters the power supply holding state, and the valve washing process is triggered at this time. The controller first controls the CSV valve to close and the PSV valve to open, and then controls the pressure building cylinder 121 to build pressure, so that the oil in the pressure building cylinder 121 flows into the wheel end through the PSV valve and the IV valve. When it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to close. At this time, since the CSV valve and the PSV valve are both closed, the oil can be sealed between the CSV valve, the PSV valve and the wheel end to maintain the pressure. After that, the OV valve is controlled to open for pressure relief, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow, and foreign matter is taken away from the valve hole. After the set opening time of the OV valve is reached, the OV valve is controlled to close, and the pressure building cylinder is controlled to replenish fluid to replenish the oil that has been unloaded to ensure sufficient oil in the circuit.

[0070] Optionally, the controller may be a driving computer, a vehicle-mounted terminal, etc. of the vehicle in which the electronic hydraulic brake system 10 is located, or may be a control device of the electronic hydraulic brake system 10 itself, etc.

[0071] Please refer to Figure 2 , Figure 2 yes Figure 1 Schematic diagram of a controller 20 in the electronic hydraulic brake system 10 shown in FIG. The controller 20 includes a memory 21, a processor 22, and a communication module 23. The memory 21, the processor 22, and the communication module 23 are electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines.

[0072] The memory 21 is used to store programs or data, for example, Figure 5The valve washing device shown in the figure includes at least one software function module that can be stored in the memory 21 in the form of software or firmware. After receiving the execution instruction, the processor 22 executes the program to implement the valve washing method disclosed in this embodiment.

[0073] The memory 21 can be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable read-only memory (EEPROM), etc.

[0074] The processor 22 is used to read / write data or programs stored in the memory 21 and execute corresponding functions. For example, Figure 1 In the electronic hydraulic brake system 10 shown, the processor 22 in the controller 20 executes the computer program stored in the memory 21 to implement the valve washing method provided in the embodiment of the present invention.

[0075] The processor 22 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the valve washing method provided in this embodiment can be completed by an integrated logic circuit of hardware in the processor 22 or an instruction in the form of software. The above-mentioned processor 22 may be a general-purpose processor, including a central processing unit (CPU), a microcontroller unit (MCU), a complex programmable logic device (CPLD), a field programmable gate array (FPGA), an embedded ARM and other chips.

[0076] The communication module 23 is used to establish a communication connection between the controller 20 and other communication terminals, sensors and solenoid valves through wireless communication such as the Internet, WiFi, Bluetooth, or communication data lines such as buses, and is used to send and receive data. Figure 1 In the electronic hydraulic brake system 10 shown, the controller 20 can receive detection data from each sensor through the communication module 23, and send control signals to the TSV valve, CSV valve, PSV valve, SSV valve, IV valve, OV valve, etc.

[0077] It should be understood that Figure 2 The structure shown is only a schematic diagram of the structure of the controller 20. The controller 20 may also include Figure 2 More or fewer components as shown, or with Figure 2 Different configurations are shown. Figure 2 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0078] The embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by the processor 22, the valve washing method disclosed in this embodiment is implemented.

[0079] Based on the electronic hydraulic brake system 10 and the controller 20 introduced above, the valve washing method provided in the embodiment of the present invention is introduced in detail.

[0080] Please refer to Figure 3 , Figure 3 The flow chart of the valve washing method provided by the present invention is shown. The valve washing method is applied to a controller in an electronic hydraulic brake system 10 and may include the following steps:

[0081] S101, when it is detected that the vehicle is powered off, the CSV valve is controlled to close and the PSV valve is controlled to open.

[0082] S102, controlling the pressure building cylinder to build pressure so that the oil in the pressure building cylinder flows into the wheel end through the PSV valve and the IV valve.

[0083] S103, when it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to close.

[0084] S104, after the PSV valve is closed, the OV valve is controlled to open for pressure relief, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow.

[0085] S105, after the set opening time of the OV valve is reached, the OV valve is controlled to close, and the pressure building cylinder is controlled to replenish fluid.

[0086] In this embodiment, when the driver stops the vehicle and turns off the engine, the entire vehicle is powered off, and the electronic hydraulic brake system 10 automatically enters a power-maintaining state, triggering the valve washing process.

[0087] Combined with Figure 1After the valve washing process starts, the CSV valve is first controlled to close and the PSV valve is opened, and then the pressure building cylinder 121 is controlled to build pressure, that is, the motor 1213 rotates forward, driving the piston 1211 to move to the bottom of the pressure building chamber 1212 to generate hydraulic pressure. Since the CSV valve has been controlled to close and the PSV valve has been opened, and the IV valve is a normally open valve, the pressure building chamber 1212 can transmit the generated hydraulic pressure to the wheel end through the two PSV valves respectively, that is, the oil in the pressure building cylinder 121 flows into the wheel end through the PSV valve and the IV valve.

[0088] Among them, the method of controlling the pressure building cylinder to build pressure in step S102 can be flexibly selected. For example, the pressure building cylinder can build the same hydraulic pressure in multiple valve washes, or the pressure building cylinder can build different hydraulic pressures in multiple valve washes. The implementation method can be flexibly set.

[0089] Optionally, when controlling the pressure-building cylinder to build pressure in step S102, the pressure-building cylinder can be controlled to build pressure according to the target pressure. The target pressure can be a value obtained by fitting a large amount of historical data or calibration test data, or a value set by a technician based on experience, for example, 50 bar. The setting of the target pressure is not limited here as long as it can ensure that the valve body can be flushed by the flow of liquid and foreign matter can be taken away from the valve hole.

[0090] At the same time, in the process of controlling the pressure-building cylinder 121 to build pressure, the hydraulic pressure of the pressure-building cylinder 121 can also be collected in real time through the pressure sensor 122, and the hydraulic pressure of the pressure-building cylinder 121 can be detected according to the reading of the pressure sensor 122. If the reading of the pressure sensor 122 remains unchanged at a reference value within the set time, it means that the hydraulic pressure of the pressure-building cylinder 121 remains stable. For example, the reading of the pressure sensor 122 remains unchanged at 49 bar within 30 ms. Among them, the set time can be set according to a large amount of historical data or calibration test data, or it can be set by a technician based on experience, for example, 30ms~50ms. The reference value is related to the target pressure when controlling the pressure-building cylinder 121 to build pressure, and can be equal to or slightly less than the target pressure, such as less than the target pressure 0~1bar, that is, the reference value can be any value in the range of 49~50bar, and the value range can be obtained after fitting based on a large amount of historical data or calibration test data, or it can be set by a technician based on experience.

[0091] When it is detected that the hydraulic pressure of the pressure-building cylinder 121 remains stable (i.e., the reading of the pressure sensor 122 remains unchanged at a reference value within the set time), it indicates that the pressure-building cylinder 121 has completed the pressure-building. At this time, the PSV valve is controlled to close. Since both the CSV valve and the PSV valve are closed, the oil can be sealed between the CSV valve, the PSV valve and the wheel end to maintain the pressure, thereby improving the subsequent valve washing effect. After that, the OV valve is controlled to open for pressure relief, so that the oil flows out of the wheel end through the OV valve and returns to the small oil pot. In this process, the valve body can be flushed by liquid flow, and foreign matter can be taken away from the valve hole, thereby ensuring the flow of the valve. After the set opening time of the OV valve is reached, the OV valve is controlled to close, and the fluid replenishment mode is entered at this time to replenish the lost oil for the pressure-building cylinder 121 to ensure sufficient oil in the circuit.

[0092] The set opening time of the OV valve in step S105 can be obtained by fitting a large amount of historical data or calibration test data, or can be set by technicians based on experience, for example, 1s. The following two principles can be used to set the opening time: 1. Since the OV valve makes a lot of noise when it is opened, its opening time should be as short as possible in theory; 2. Based on point 1, although the opening time of the OV valve is theoretically as short as possible, it cannot be shorter than the time it takes for the liquid to flush the valve body and remove foreign matter from the valve hole.

[0093] After entering the fluid replenishment mode, the motor is controlled to reverse, driving the piston 1211 to move toward the top of the pressure-building chamber 1212 so that a pressure difference is generated between the pressure-building chamber 1212 and the small oil pot. At this time, the one-way valve is turned on, and the oil in the small oil pot flows into the pressure-building chamber 1212, thereby achieving fluid replenishment. If the motor is reversed with a large torque, the oil in the pressure-building chamber 1212 can be filled at one time due to the large pressure difference generated. However, if the motor is reversed with a small torque, the oil in the pressure-building chamber 1212 cannot be filled at one time due to the small pressure difference generated. At this time, it is necessary to continue to control the motor 1213 to rotate forward, driving the piston 1211 to move toward the bottom of the pressure-building chamber 1212, and then controlling the motor 1213 to reverse to continue to replenish the pressure-building chamber 1212. Repeat this 2-3 times until the oil in the pressure-building chamber 1212 is filled. Since the PSV valve has been closed in step S103, the motor 1213 is controlled to rotate forward, and the oil will not flow out of the pressure building chamber 1212 when the piston 1211 moves to the bottom of the pressure building chamber 1212, so that the liquid replenishment can be completed in multiple times.

[0094] Optionally, in step S105, controlling the pressure building cylinder to perform a fluid replenishing process may include:

[0095] According to the first set torque, the motor is controlled to rotate reversely and forwardly alternately to replenish the pressure building cylinder with fluid for multiple times until the replenishment is completed; or, according to the second set torque, the motor is controlled to rotate reversely to replenish the pressure building cylinder with fluid once to complete the replenishment; wherein the first set torque is less than the second set torque.

[0096] Among them, the first set torque and the second set torque can be flexibly set according to actual conditions. As long as the noise is small when the motor is reversed by the first set torque and the fluid replenishment can be completed in one time when the motor is reversed by the second set torque, the second set torque can be the maximum torque, which can complete the fluid replenishment in ms.

[0097] That is, in step S105, the pressure-building cylinder is controlled to replenish the fluid. The motor can be controlled to rotate at high speed to replenish the lost fluid at one time, or the motor can be controlled to rotate at low speed to replenish the fluid in multiple times. When the motor rotates at high speed, the noise is relatively large, but the fluid replenishment can be completed in one time. When the motor rotates at low speed, the noise is small, but it takes multiple times to complete the fluid replenishment. The two fluid replenishment methods can be flexibly selected in practice. For example, in the normal valve washing process, the motor can be controlled to rotate at low speed to replenish the fluid in multiple times to reduce noise. However, if it is detected that the vehicle is powered on again or the driver steps on the brake pedal, the valve washing process needs to be quickly ended at this time, and the motor can be controlled to rotate at high speed to complete the fluid replenishment in one time.

[0098] The above introduces a valve cleaning process. In practice, in order to achieve a better valve cleaning effect, multiple valve cleanings may be required. Figure 3 Based on Figure 4 The valve washing method provided in the embodiment of the present invention also includes steps S106~S107.

[0099] S106, after the pressure-building cylinder is replenished, the PSV valve is controlled to reopen.

[0100] S107, return to execute steps S102~S105 until the valve washing times reach the set value, and end the valve washing process.

[0101] Among them, the set value of the valve washing times can be flexibly set according to actual conditions, such as being set according to a large amount of historical data or calibration test data, or being set by a technician based on experience, for example, 5 times.

[0102] The above valve washing process is triggered and executed when the driver stops the car and turns off the engine, and the whole vehicle is powered off. If the whole vehicle is powered on again or the driver steps on the brake pedal during the valve washing process, the valve washing process needs to be ended. At this time, if the valve washing process is in the fluid replenishment stage, that is, the pressure building cylinder is being controlled for fluid replenishment, the fluid replenishment must be completed quickly, for example, the motor is controlled to reverse with maximum torque to complete the fluid replenishment within ms, and then the valve washing process is ended. If the valve washing process is not in the fluid replenishment stage, the valve washing process is immediately ended to ensure braking safety.

[0103] Therefore, in a possible implementation, the valve washing method provided in the embodiment of the present invention further includes steps S10a to S10c.

[0104] S10a, when it is detected that the vehicle is powered on again or the brake pedal is displaced, it is determined whether the electronic hydraulic brake system is currently in a pressure-building cylinder fluid-replenishing stage.

[0105] S10b, if the electronic hydraulic brake system is currently in the pressure-building cylinder replenishing stage, the motor is controlled to reverse according to the maximum set torque to replenish the pressure-building cylinder, and then the valve washing process ends.

[0106] S10c: If the electronic hydraulic brake system is not currently in the pressure-building cylinder fluid-replenishing stage, the valve washing process is directly terminated.

[0107] In some possible implementations, after the valve washing process is triggered but before it starts to be executed, a large current greater than the normal operating current can be used to energize the IV valve, that is, the IV valve is closed to magnetize the solenoid valve of the IV valve, and then the power is turned off to open the IV valve, and then the valve washing process is executed. Since the solenoid valve of the IV valve is magnetized, the valve hole flow of the IV valve can be increased during the valve washing process, thereby improving the valve washing effect.

[0108] That is, before controlling the CSV valve to close and the PSV valve to open in step S101, the valve washing method provided by the embodiment of the present invention further includes step S10A.

[0109] S10A, controlling the IV valve to close according to a set current, so as to magnetize the solenoid valve of the IV valve and then control the IV valve to reopen, wherein the set current is greater than the normal working current of the IV valve.

[0110] from Figure 1 It can be seen that there are four IV valves and four OV valves in the electronic hydraulic brake system 10. In practice, only some of the valve holes may be blocked. Therefore, in order to further improve the valve washing effect, the valve with a blocked valve hole can be found first, and then the valve with the blocked valve hole can be washed.

[0111] Therefore, the process of controlling the CSV valve to close and the PSV valve to open in step S101 may include: obtaining the braking response time of each wheel end when the electronic hydraulic brake system brakes; determining each target wheel end whose braking response time is greater than a set threshold from all the wheel ends; controlling the CSV valve to close, the PSV valve corresponding to each target wheel end to open, and the IV valve corresponding to each other wheel end except all the target wheel ends to close. The process of controlling the OV valve to open for pressure relief in step S104 may include: controlling the OV valve corresponding to each target wheel end to open for pressure relief.

[0112] That is, when the electronic hydraulic brake system 10 brakes, the braking response time of the four wheel ends is obtained. If the braking response time of a wheel end is greater than the set threshold, it is considered that the valve holes of the IV valve and the OV valve corresponding to the wheel end are blocked. For example, Figure 1The valve hole corresponding to 1F in is blocked. At this time, CSV is controlled to be closed, PSV1 is opened, and IV1R is closed, and then the subsequent valve washing strategy is carried out, that is, the pressure building cylinder 121 is controlled to build pressure, so that the oil in the pressure building cylinder 121 flows into the wheel end through the PSV1 and IV1F valves. When it is detected that the hydraulic pressure of the pressure building cylinder 121 remains stable, PSV1 is controlled to be closed to maintain the pressure, and then OV1F is controlled to open for pressure relief, so that the oil flows out of the wheel end through OV1F and flushes the valve body through the liquid flow, taking foreign matter away from the valve hole, so that only IV1F and OV1F can be flushed, thereby improving the valve washing effect.

[0113] In some possible implementations, when the OV valve is opened, all valves that need valve cleaning can be opened to release pressure. Here, all valves that need valve cleaning can be all OV valves, or can be the OV valves corresponding to each target wheel end determined above. When closed, they are closed in sequence according to the set order. For example, Figure 1 The four OA valves in the valve are closed sequentially from left to right, so that the hydraulic pressure will be continuously transmitted backwards, improving the valve washing effect.

[0114] Therefore, the process of controlling the OV valve to open for pressure relief in step S104 may include: controlling all OV valves to open simultaneously for pressure relief. The process of controlling the OV valve to close in step S105 may include: controlling each OV valve to close in sequence according to a set order.

[0115] Among them, the setting order can be flexibly set according to actual conditions. For example, by obtaining the braking response time of the four wheel ends when braking occurs in the electronic hydraulic braking system 10, the blockage of the valve holes corresponding to each wheel end can be judged, and they are sorted in order from low to high. When closing the OA valve, it is closed in this order, that is, it is closed in order from low blockage to high blockage.

[0116] Through the valve washing process introduced above, the PSV valve, IV valve and OV valve can be flushed by liquid flow to remove foreign matter from the valve hole, thereby significantly reducing the accumulation of foreign matter and impurities in the valve hole, improving the performance of the electronic hydraulic brake system, and further improving the safety of the entire vehicle. In practice, since the PSV valve and IV valve are normally open valves and the OV valve is a normally closed valve, foreign matter and impurities are mainly accumulated in the valve hole of the OV valve. Through the above pressure building and pressure relief process, foreign matter can be especially removed from the valve hole of the OV valve.

[0117] In addition to being able to flush the PSV valve, IV valve and OV valve in the electronic hydraulic brake system, the valve flushing method provided in the embodiment of the present invention can also flush the TSV valve, SSV valve and CSV valve, which is introduced below.

[0118] In an optional implementation, the valve washing method provided in the embodiment of the present invention further includes steps S201 to S203.

[0119] S201, when it is detected that the vehicle is powered off or the pressure cylinder is replenished, the CSV valve is controlled to open, the PSV valve is controlled to open, and the IV valve is controlled to close.

[0120] S202, controlling the pressure building cylinder to build pressure, so that the oil in the pressure building cylinder flows into the master cylinder of the electronic hydraulic brake system through the PSV valve and the CSV valve.

[0121] S203, when it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to be closed so that the oil flows out of the master cylinder through the TSV valve; or, when it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to be closed, the TSV valve is closed, and the SSV valve is opened so that the oil flows out of the master cylinder through the SSV valve.

[0122] That is, since the fluid inlet and outlet of the master cylinder are open after the vehicle is powered off, this feature can be used to flush the TSV valve, SSV valve and CSV valve. Figure 1 The TSV valve, SSV valve and CSV valve can be flushed when the vehicle is detected to be powered off, or the TSV valve, SSV valve and CSV valve can be flushed after the IV valve and OV valve are flushed. There is no restriction on this.

[0123] When the TSV valve, SSV valve and CSV valve need to be flushed, the controller first controls the CSV valve to open, the PSV valve to open, and the IV valve to close, and then controls the pressure-building cylinder 121 to build pressure, so that the oil in the pressure-building cylinder 121 flows into the main cylinder through the PSV valve and the CSV valve, and the flushing of the CSV valve can be completed. When it is detected that the hydraulic pressure of the pressure-building cylinder remains stable, the PSV valve is controlled to close. Since the TSV valve is a normally open valve, the oil can flow from the main cylinder back to the small oil pot through the TSV valve, and the flushing of the TSV valve can be completed. Alternatively, when it is detected that the hydraulic pressure of the pressure-building cylinder remains stable, the PSV valve is controlled to close, the TSV valve is closed, and the SSV valve is opened, so that the oil can flow from the main cylinder back to the small oil pot through the SSV valve, and the flushing of the SSV valve can be completed.

[0124] At the same time, since there are two CSV valves, in order to improve the flushing effect and avoid the piston of the master cylinder moving due to excessive pressure when the oil flows into the master cylinder, the two CSV valves can also be flushed separately.

[0125] When CSV1 needs to be flushed, the controller first controls the PSV valve to open, the IV valve to close, and the CSV2 to close, and then controls the pressure-building cylinder 121 to build pressure, so that the oil in the pressure-building cylinder 121 flows into the main cylinder through the PSV valve and CSV1, and the flushing of CSV1 can be completed. When it is detected that the hydraulic pressure of the pressure-building cylinder remains stable, the PSV valve is controlled to close. Since the TSV valve is a normally open valve, the oil can flow from the main cylinder back to the small oil pot through the TSV valve, and the flushing of the TSV valve can be completed. Alternatively, when it is detected that the hydraulic pressure of the pressure-building cylinder remains stable, the PSV valve is controlled to close, the TSV valve is closed, and the SSV valve is opened, so that the oil can flow from the main cylinder back to the small oil pot through the SSV valve, and the flushing of the SSV valve can be completed.

[0126] When CSV2 needs to be flushed, the controller first controls the PSV valve to open, the IV valve to close, and CSV1 to close, and then controls the pressure building cylinder 121 to build pressure, so that the oil in the pressure building cylinder 121 flows into the main cylinder through the PSV valve and CSV2. At this time, the flushing of CSV2 can be completed. When it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to close, and the oil flows back to the small oil pot through the outlet of the main cylinder.

[0127] In order to execute the corresponding steps in the above-mentioned embodiment and each possible implementation mode, a method for implementing the valve washing device is given below.

[0128] Please refer to Figure 5 , which is a functional module diagram of the valve washing device 100 provided by the present invention. It should be noted that the basic principle and technical effect of the valve washing device 100 described in this embodiment are the same as those of the aforementioned method embodiment. For the sake of brief description, the parts not mentioned in this embodiment can refer to the corresponding contents of the aforementioned method embodiment. The valve washing device 100 is applied to the controller of the electronic hydraulic brake system 10. Figure 5 The valve washing device 100 is introduced. The valve washing device 100 includes: a valve body control module 101 , a pressure building control module 102 , a pressure relief control module 103 and a liquid replenishment control module 104 .

[0129] The valve body control module 101 is used to control the CSV valve to close and the PSV valve to open when it is detected that the vehicle is powered off.

[0130] The pressure building control module 102 is used to control the pressure building cylinder to build pressure, so that the oil in the pressure building cylinder flows into the wheel end through the PSV valve and the IV valve.

[0131] The valve body control module 101 is also used to control the PSV valve to close when it is detected that the hydraulic pressure of the pressure building cylinder remains stable.

[0132] The pressure relief control module 103 is used to control the OV valve to open for pressure relief after the PSV valve is closed, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow.

[0133] The liquid replenishment control module 104 is used to control the OV valve to close after the set opening time of the OV valve is reached, and control the pressure building cylinder to replenish liquid.

[0134] Optionally, the valve washing device 100 provided in the embodiment of the present invention also includes a valve washing control module 105, which is used to control the PSV valve to reopen after the pressure cylinder is replenished with fluid; return to execute steps S102~S105 until the number of valve washing times reaches the set value, and end the valve washing process.

[0135] Optionally, the pressure building control module 102 executes a method of controlling the pressure building cylinder to build pressure, including: according to a first set torque, controlling the motor to alternately reverse and forward to replenish fluid to the pressure building cylinder multiple times until the replenishment is completed; or, according to a second set torque, controlling the motor to reverse to replenish fluid to the pressure building cylinder once to complete the replenishment; wherein the first set torque is less than the second set torque.

[0136] Optionally, the valve washing control module 105 is also used to determine whether the electronic hydraulic braking system is currently in the pressure building cylinder replenishment stage when it is detected that the vehicle is powered on again or the brake pedal is displaced; if so, the motor is controlled to reverse according to the maximum set torque to replenish the pressure building cylinder and then end the valve washing process; if not, the valve washing process is ended directly.

[0137] Optionally, the valve washing control module 105 is also used to control the IV valve to close according to a set current, so as to control the IV valve to reopen after the solenoid valve of the IV valve is magnetized, wherein the set current is greater than the normal working current of the IV valve.

[0138] Optionally, the valve body control module 101 controls the CSV valve to close and the PSV valve to open when it is detected that the vehicle is powered off, including: obtaining the braking response time of each wheel end when braking occurs in the electronic hydraulic braking system; determining, from all the wheel ends, each target wheel end whose braking response time is greater than a set threshold; controlling the CSV valve to close, the PSV valve corresponding to each target wheel end to open, and the IV valve corresponding to each other wheel end except all the target wheel ends to close.

[0139] The pressure relief control module 103 executes a method of controlling the OV valve to open for pressure relief, including: controlling the OV valve corresponding to each target wheel end to open for pressure relief.

[0140] Optionally, the pressure relief control module 103 executes a method of controlling the OV valve to open for pressure relief, including: controlling all OV valves to open simultaneously for pressure relief.

[0141] The method in which the fluid replenishment control module 104 controls the closing of the OV valve includes: controlling each OV valve to close in sequence according to a set sequence.

[0142] Optionally, the valve washing control module 105 is also used to control the CSV valve to open, the PSV valve to open, and the IV valve to close when it is detected that the vehicle is powered off or the pressure building cylinder is replenished; control the pressure building cylinder to build pressure so that the oil in the pressure building cylinder flows into the master cylinder of the electronic hydraulic brake system through the PSV valve and the CSV valve; when it is detected that the hydraulic pressure of the pressure building cylinder remains stable, control the PSV valve to close so that the oil flows out of the master cylinder through the TSV valve; or, when it is detected that the hydraulic pressure of the pressure building cylinder remains stable, control the PSV valve to close, the TSV valve to close, and the SSV valve to open, so that the oil flows out of the master cylinder through the SSV valve.

[0143] In summary, the valve washing method, valve washing device and electronic hydraulic brake system provided by the embodiments of the present invention have at least the following beneficial effects:

[0144] First of all, the valve cleaning process is carried out every time the vehicle is powered off. The valve body is flushed by liquid flow, and foreign matter is removed from the valve hole, which can significantly reduce the accumulation of foreign matter and impurities in the valve hole, improve the performance of the electronic hydraulic braking system, and thus improve the safety of the entire vehicle.

[0145] Secondly, during the valve washing process, if the vehicle is powered on again or the driver steps on the brake pedal, if the valve washing process is in the fluid replenishment stage, the fluid replenishment must be completed quickly and then the valve washing process must be terminated. If the valve washing process is not in the fluid replenishment stage, the valve washing process must be terminated immediately to ensure braking safety.

[0146] Third, after the valve washing process is triggered but before it starts to execute, a large current greater than the normal operating current can be used to energize the IV valve to magnetize the solenoid valve of the IV valve. This can increase the valve hole flow of the IV valve during the subsequent valve washing process, thereby improving the valve washing effect.

[0147] Fourth, during the valve washing process, the IV valve and OV valve with blocked valve holes can be found out through the brake response time of each wheel end, and only the valve with blocked valve holes is washed, thereby improving the valve washing effect.

[0148] Fifth, when the OV valve is opened, it can open all valves that need valve cleaning to relieve pressure, and when it is closed, it will be closed in sequence according to the set order. In this way, the hydraulic pressure will be continuously transmitted backwards, improving the valve cleaning effect.

[0149] Sixth, when replenishing the pressure-building cylinder, the motor can be controlled to rotate at a high speed to replenish the lost oil at one time, or the motor can be controlled to rotate at a low speed to replenish the oil in multiple times to replenish the oil that has been unloaded and ensure that the circuit oil is sufficient.

[0150] In several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0151] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0152] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

[0153] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve washing method, characterized in that: A controller applied to an electronic hydraulic brake system, wherein the controller is electrically connected to a pressure-building cylinder, a PSV valve, a CSV valve, an IV valve, and an OV valve of the electronic hydraulic brake system, respectively, and the method comprises: When it is detected that the vehicle is powered off, the CSV valve is controlled to be closed and the PSV valve is controlled to be opened; wherein the steps of controlling the CSV valve to be closed and the PSV valve to be opened include: obtaining the braking response time of each wheel end when the electronic hydraulic braking system brakes; determining each target wheel end whose braking response time is greater than a set threshold from all the wheel ends; controlling the CSV valve to be closed, the PSV valve corresponding to each target wheel end to be opened, and the IV valve corresponding to each other wheel end except all the target wheel ends to be closed; Controlling the pressure building cylinder to build pressure, so that the oil in the pressure building cylinder flows into the wheel end through the PSV valve and the IV valve; When it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to close so as to seal the oil between the CSV valve, the PSV valve and the wheel end to maintain the pressure; After the PSV valve is closed, the OV valve is controlled to open for pressure relief, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow to remove foreign matter from the valve hole; After the set opening time of the OV valve is reached, the OV valve is controlled to close, and the pressure-building cylinder is controlled to replenish liquid, and the set opening time is minimized under the premise that it is greater than the time for the foreign matter to be removed from the valve hole by flushing the valve body through the flow of liquid; After the pressure-building cylinder is replenished with fluid, controlling the PSV valve to reopen; Return to the step of controlling the pressure building cylinder to build pressure until the valve washing times reaches the set value, and the valve washing process ends.

2. The valve washing method according to claim 1, characterized in that: The controller is electrically connected to the motor of the pressure building cylinder, and controls the pressure building cylinder to replenish fluid, including: According to the first set torque, the motor is controlled to rotate reversely and forwardly alternately to replenish the pressure building cylinder with fluid for multiple times until the replenishment is completed; Alternatively, according to the second set torque, the motor is controlled to rotate in reverse, so as to replenish the pressure building cylinder with fluid once so that the replenishment is completed; Wherein, the first set torque is smaller than the second set torque.

3. The valve washing method according to claim 1, characterized in that: The method further comprises: When it is detected that the vehicle is powered on again or the brake pedal is displaced, it is determined whether the electronic hydraulic brake system is currently in the pressure-building cylinder fluid-replenishing stage; If yes, the motor is controlled to reverse according to the maximum set torque to replenish the pressure-building cylinder with fluid, thereby ending the valve washing process; If not, the valve cleaning process ends directly.

4. The valve washing method according to claim 1, characterized in that: Before controlling the CSV valve to close and the PSV valve to open, the method further includes: The IV valve is controlled to be closed according to a set current, so as to control the IV valve to reopen after the solenoid valve of the IV valve is magnetized, wherein the set current is greater than the normal working current of the IV valve.

5. The valve washing method according to claim 1, characterized in that: There are four wheel ends, four IV valves and four OV valves respectively, two PSV valves, the pressure building cylinder is connected to two PSV valves respectively, one PSV valve is connected to two wheel ends through two IV valves respectively, and one wheel end is connected to an oil tank through one OV valve; The step of controlling the OV valve to open for pressure relief comprises: The OV valve corresponding to each target wheel end is controlled to open for pressure relief.

6. The valve washing method according to claim 1, characterized in that: There are four OV valves; the steps of controlling the OV valves to open for pressure relief include: Control all the OV valves to open simultaneously for pressure relief; The step of controlling the OV valve to close comprises: According to the set sequence, each of the OV valves is controlled to close in turn.

7. The valve washing method according to claim 1, characterized in that: The controller is also electrically connected to the TSV valve and the SSV valve of the electronic hydraulic brake system respectively, and the method further includes: When it is detected that the vehicle is powered off or the pressure-building cylinder is replenished, the CSV valve is controlled to open, the PSV valve is controlled to open, and the IV valve is controlled to close; Controlling the pressure-building cylinder to build pressure, so that the oil in the pressure-building cylinder flows into the master cylinder of the electronic hydraulic brake system through the PSV valve and the CSV valve; When it is detected that the hydraulic pressure of the pressure-building cylinder remains stable, the PSV valve is controlled to close so that the oil flows out of the master cylinder through the TSV valve; Alternatively, when it is detected that the hydraulic pressure of the pressure building cylinder remains stable, the PSV valve is controlled to be closed, the TSV valve is controlled to be closed, and the SSV valve is controlled to be opened, so that the oil flows out of the master cylinder through the SSV valve.

8. A valve washing device, characterized in that: A controller applied to an electronic hydraulic brake system, wherein the controller is electrically connected to a pressure-building cylinder, a PSV valve, a CSV valve, an IV valve and an OV valve of the electronic hydraulic brake system, respectively, and the device comprises: A valve body control module, used for controlling the CSV valve to close and the PSV valve to open when it is detected that the vehicle is powered off; wherein the valve body control module executes the method of controlling the CSV valve to close and the PSV valve to open, including: obtaining the braking response time of each wheel end when the electronic hydraulic braking system brakes; determining each target wheel end whose braking response time is greater than a set threshold from all the wheel ends; controlling the CSV valve to close, the PSV valve corresponding to each target wheel end to open, and the IV valve corresponding to each other wheel end except all the target wheel ends to close; a pressure building control module, used for controlling the pressure building cylinder to build pressure, so that the oil in the pressure building cylinder flows into the wheel end through the PSV valve and the IV valve; The valve body control module is further used to control the PSV valve to close when it is detected that the hydraulic pressure of the pressure building cylinder remains stable, so as to seal the oil between the CSV valve, the PSV valve and the wheel end to maintain the pressure; A pressure relief control module, used for controlling the OV valve to open for pressure relief after the PSV valve is closed, so that the oil flows out of the wheel end through the OV valve and flushes the valve body through the liquid flow to remove foreign matter from the valve hole; A liquid replenishment control module, used to control the OV valve to close and control the pressure-building cylinder to replenish liquid after the set opening time of the OV valve is reached, and the set opening time is minimized under the premise that it is greater than the time for the foreign matter to be removed from the valve hole by flushing the valve body through the flow of liquid; The valve washing control module is used to control the PSV valve to reopen after the pressure building cylinder is replenished with fluid; return to execute the step of controlling the pressure building cylinder to build pressure until the valve washing times reaches the set value, thereby ending the valve washing process.

9. An electronic hydraulic brake system, characterized in that: It comprises a controller, wherein the controller is used to execute the valve washing method described in any one of claims 1-7.

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