ESP executing mechanism function detection device and detection method thereof

Abstract

The invention discloses an ESP actuating mechanism function detection device and a detection method thereof, and belongs to the technical field of automobile brake-by-wire chassis, and the device comprises a test control end, a to-be-detected ESP actuating mechanism, an external pressure buildup mechanism, an external exhaust normally-closed valve and a wheel cylinder assembly. A to-be-detected ESP executing mechanism is installed on the ESP detection working face and connected through a hydraulic pipeline. Air in the ESP executing mechanism to be tested is emptied before testing, and the testing content comprises active pressure building and pressure sensor checking, TC normally-open valve sealing detection, IV normally-open valve sealing detection and OV normally-closed valve sealing detection. The detection device is adopted to detect the function of the to-be-detected ESP executing mechanism. The device is built by adopting simple profiles, the detection efficiency is improved through automatic test logic, and the device has high economical efficiency and manufacturability.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile brake-by-wire chassis, and in particular to an ESP actuator function detection device and a detection method thereof. Background Art

[0002] As a core active safety system in vehicles, the ESP system dynamically adjusts the vehicle's braking force distribution to effectively prevent risks such as wheel slip, loss of control, rollover, and steering errors in emergency situations. Its performance and reliability are directly related to driving safety. To ensure the proper functioning of the ESP system, the industry has strict requirements for the functionality of its actuators, including the ability to quickly respond and build up the desired pressure, the efficiency of rapid pressure relief, the sealing of the entire system and various solenoid valves, and the signal accuracy of the pressure sensors.

[0003] Mainstream test benches often integrate multi-dimensional test modules and require complex hydraulic piping, precision control components, and data acquisition systems. This results in high manufacturing costs and difficult maintenance, making the equipment suitable only for large laboratories or mass production lines, and unaffordable for small and medium-sized enterprises. Traditional testing processes require manual, step-by-step operations, such as switching test items, adjusting parameters, and recording data. This is not only time-consuming but also prone to human error affecting test accuracy. Most testing equipment is designed for specific ESP actuator models. Testing ESP actuators of different specifications requires hardware re-commissioning or control program modification, which lacks flexibility.

[0004] Existing technologies cannot balance the economy, efficiency and flexibility of ESP function testing. There is an urgent need for a device with simple structure, low cost and automated testing to meet the industry's demand for rapid verification of ESP actuator functions. Summary of the Invention

[0005] The present invention aims to provide an ESP actuator function testing device and method for testing the functions of components comprising the ESP actuator, such as the system's active pressure buildup test and TC (Traction Control Valve) seal testing, IV (Inlet Valve) seal testing, and OV (Outlet Valve) seal testing. This approach addresses the existing issues of ESP performance testing platforms, which are complex and expensive, have low test efficiency, and are difficult to complete quickly and easily.

[0006] To achieve the above-mentioned objectives, the present invention provides an ESP actuator function detection device, comprising a test control end, an ESP actuator to be tested, an external pressure-building mechanism, an external exhaust normally-closed valve, and a wheel cylinder assembly; the test control end comprises an industrial computer and an ECU controller, the industrial computer is electrically connected to the ECU controller, the test control end is electrically connected to the ESP actuator to be tested, the external pressure-building mechanism, and the external exhaust normally-closed valve, respectively, the external pressure-building mechanism is connected to the wheel cylinder assembly via the ESP actuator to be tested, the wheel cylinder assembly and the external pressure-building mechanism are both connected to the external exhaust normally-closed valve, a wheel cylinder pressure sensor is provided on the wheel cylinder assembly, an ESP actuator pressure sensor is provided on the ESP actuator to be tested, and both the wheel cylinder pressure sensor and the ESP actuator pressure sensor are electrically connected to the test control end.

[0007] Preferably, the external pressure-building mechanism includes an electric cylinder and a master cylinder connected to the output end of the electric cylinder; the wheel cylinder assembly includes a right front wheel cylinder (FR), a left rear wheel cylinder (RL), a right rear wheel cylinder (RR), and a left front wheel cylinder (FL); the output end of the wheel cylinder assembly is connected to the wheel cylinder pressure sensor via four transparent connecting pipes, the output ends of the four transparent connecting pipes converge into an oil return line connected to the external pressure-building mechanism, and an external exhaust normally closed valve is provided on the oil return line in the direction from the wheel cylinder assembly to the external pressure-building mechanism; The transparent connecting pipe adopts a segmented pipeline structure with oil pipes at both ends and a quartz glass tube in the middle, and the outer cover of the quartz glass tube is provided with a transparent protective cover.

[0008] Preferably, the ESP actuator to be tested includes two test main circuits, one end of the two test main circuits is connected to the master cylinder chamber 1 (MC1) and the master cylinder chamber 2 (MC2) of the master cylinder respectively, and the other end of the two test main circuits is connected to the left rear wheel cylinder and the right rear wheel cylinder respectively. A TC normally open valve and a first IV normally open valve are sequentially provided on each test main circuit in the direction from the master cylinder to the left rear wheel cylinder or the right rear wheel cylinder. The valves are located between the TC normally open valve and the master cylinder chamber 2. The TC normally open valve is connected to the HSV normally closed valve (High pressure valve) via the first test branch. The TC normally open valve and the HSV normally closed valve are connected in parallel. A plunger pump controlled by a motor is further provided between the TC normally open valve and the HSV normally closed valve. The plunger pump is unidirectionally conducted from the HSV normally closed valve to the TC normally open valve. The plunger pump and the HSV normally closed valve are respectively connected to the right rear wheel cylinder and the left rear wheel cylinder via a second test branch, and the second test branch is provided with a first OV normally closed valve. One end of a third test branch is connected between the TC normally open valve and the first IV normally open valve, and the other end of the third test branch is connected to the right front wheel cylinder or the left front wheel cylinder. The third test branch is provided with a second IV normally open valve and a second OV normally closed valve.

[0009] A method for detecting the function of an ESP actuator, using the above-mentioned detection device, comprises the following steps: S1. Exhaust: Exhaust the air inside the ESP actuator under test. The industrial computer sends a control command to the ECU controller to make the brake fluid flow through the ESP actuator under test to exhaust the internal air. Observe whether there are bubbles in the transparent connecting tube. If there are no bubbles, it is determined that the air inside the ESP actuator under test has been exhausted. Otherwise, it is determined that the air inside the ESP actuator under test has not been exhausted. S2. Test the following functions of the ESP actuator: active pressure buildup and pressure sensor calibration, TC normally open valve sealing test, IV normally open valve sealing test, OV normally closed valve sealing test.

[0010] Preferably, step S1 specifically includes the following steps: S11. Empty the air in the test main circuit and the first test branch circuit: Use the industrial computer to send a control instruction to the ECU controller to control the operation of the motor, so that the brake fluid in the master cylinder flows into the ESP actuator to be tested. At the same time, the HSV normally closed valve and the external exhaust normally closed valve are opened, so that the brake fluid flows from the master cylinder into the two test main circuits respectively. Part of the brake fluid flowing into the test main circuit flows into the first test branch circuit and out through the output end of the HSV normally closed valve. Then, it flows into the test main circuit from the output end of the first test branch circuit through the plunger pump. The other part flows out from the output end of the TC normally open valve in the test main circuit. The two parts of brake fluid merge in the test main circuit and flow into the wheel cylinder assembly through the output ends of the first IV normally open valve and the second IV normally open valve. The brake fluid in the wheel cylinder assembly flows into the external exhaust normally closed valve through the transparent connecting pipe. The brake fluid flows back to the master cylinder through the external exhaust normally closed valve. The gas in the brake fluid is discharged through the vent hole of the master cylinder oil pot. After a period of time, step S12 is executed; S12. Empty the air in the second test branch and the third test branch: Use the industrial computer to send a control instruction to the ECU controller to control the motor operation, so that the brake fluid in the master cylinder flows into the ESP actuator to be tested, and at the same time open the HSV normally closed valve, the first OV normally closed valve, the second OV normally closed valve, and the external exhaust normally closed valve. The brake fluid flows from the master cylinder into the two test main circuits respectively. Part of the brake fluid flowing into the test main circuit flows into the first test branch and flows out through the output end of the HSV normally closed valve, and flows into the test main circuit from the output end of the first test branch through the plunger pump. The other part flows out from the output end of the TC normally open valve in the test main circuit. The two parts of brake fluid merge in the test main circuit and pass through The brake fluid flows out from the output ends of the first IV normally open valve and the second IV normally open valve, and the outflowing brake fluid is divided into three parts. The first part flows into the wheel cylinder assembly, the second part flows into the second test branch and flows out through the output end of the first OV normally closed valve, and the third part flows into the third test branch and flows out through the output end of the second OV normally closed valve. The brake fluid flowing out of the second and third parts merges and flows into the first test branch, flows into the test main circuit through the plunger pump, and flows into the wheel cylinder assembly through the output ends of the first IV normally open valve and the second IV normally open valve. The brake fluid in the wheel cylinder assembly flows into the external exhaust normally closed valve through the transparent connecting pipe, and the brake fluid flows back to the master cylinder through the external exhaust normally closed valve. The gas in the brake fluid is discharged through the vent hole of the master cylinder oil pot; S13. Repeat steps S11 and S12 until no bubbles are found in the brake fluid observed through the transparent connecting tube.

[0011] Preferably, the specific steps of active pressure building and pressure sensor calibration described in step S2 are as follows: The industrial computer sends a control instruction to the ECU controller to control the operation of the motor, so that the brake fluid in the master cylinder flows into the ESP actuator to be tested. At the same time, the TC normally open valve is closed and the HSV normally closed valve is opened to allow the brake fluid to flow from the master cylinder into the first test branch and out through the output end of the HSV normally closed valve. Then, the brake fluid flows into the test main circuit through the plunger pump, passes through the output ends of the first IV normally open valve and the second IV normally open valve, and flows into the wheel cylinder. Finally, the wheel cylinder pressure sensors read the pressure values ​​of the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder, and left front wheel cylinder, which are P11, P12, P21, and P22, respectively. At the same time, the ECU controller reads the pressure value P3 of the ESP actuator pressure sensor. Select the right front wheel cylinder pressure value P11 and the right rear wheel cylinder pressure value P21 for comparative analysis. If any pressure value of P11 or P21 is zero or both pressure values ​​are zero, it is determined that the active pressure buildup is abnormal; when both pressure values ​​are not zero, determine the difference between the two pressure values. If the difference in pressure values ​​is greater than the set value, it is determined that the unilateral active pressure buildup is abnormal; select pressure value P21 or pressure value P22. If P21 or P22 is equal to P3, it is determined that the wheel cylinder pressure sensor transmission signal is normal. Otherwise, determine whether the difference between one of the pressure values ​​P21 or P22 and the pressure value P3 exceeds the set value. If so, it is determined that the wheel cylinder pressure sensor transmission signal is abnormal. Otherwise, it is determined that the wheel cylinder pressure sensor transmission signal is normal. If not, it is determined that the wheel cylinder pressure sensor transmission signal is normal. If the active pressure buildup function test is normal, it is determined that the HSV normally closed valve function is normal.

[0012] Preferably, the specific steps of the TC normally open valve sealing detection in step S2 are as follows: The industrial computer sends a control command to the ECU controller to control the motor operation, control the electric cylinder to push the master cylinder so that the brake fluid flows from the master cylinder into the test main circuit through the output end of the TC normally open valve into the first IV normally open valve and the second IV normally open valve, and then into the wheel cylinder assembly through the output end of the first IV normally open valve and the second IV normally open valve. When the thrust reaches 500N, the motor operation stops, and the industrial computer sends a control command to the ECU controller to close the TC normally open valve. The industrial computer sends a control command to the ECU controller to control the motor operation and return the electric cylinder. After the electric cylinder returns, the voltage is stabilized for 3-5 seconds. At this time, the pressure sensor value of any wheel cylinder among the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder and left front wheel cylinder is recorded as P4. This state is maintained for 30 seconds, and the pressure sensor value of this wheel cylinder is read again and recorded as P5. If the value of P4-P5 is less than or equal to 3 bar, the TC valve is judged to be normal in sealing, otherwise it is judged that the TC valve is leaking.

[0013] Preferably, the specific steps of the IV normally open valve sealing detection in step S2 are as follows: The industrial computer sends a control instruction to the ECU controller to close the first IV normally open valve and the second IV normally open valve, controls the motor to drive the electric cylinder to a certain force value X1, so that the brake fluid flows from the master cylinder into the test main circuit, passes through the output end of the TC normally open valve, and flows into the first IV normally open valve and the second IV normally open valve, and maintains this for 30 seconds. The pressure rise values ​​of the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder and left front wheel cylinder in the wheel cylinder assembly within 30 seconds are read; the IV normally open valve is in a closed state, blocking the passage of brake fluid, so the pressure rise value of the wheel cylinder pressure sensor is zero. At this time, if all the pressure rise values ​​in the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder and left front wheel cylinder are equal to 0 or less than the critical value a, it is determined that the sealing of the IV normally open valve is normal; otherwise, it is determined that the IV normally open valve is leaking.

[0014] Preferably, the OV normally closed valve sealing detection described in step S2 specifically comprises the following steps: The industrial computer sends control instructions to the ECU controller to control the operation of the motor, pushing the electric cylinder to a certain force value X2, so that the brake fluid flows from the master cylinder into the test main circuit, passes through the output end of the TC normally open valve, and flows into the first IV normally open valve and the second IV normally open valve. Part of the brake fluid flowing out of the output ends of the first IV normally open valve and the second IV normally open valve flows into the wheel cylinder assembly, and the other part flows into the first OV normally closed valve and the second OV normally closed valve; the first OV normally closed valve and the second OV normally closed valve are closed by default, blocking the passage of brake fluid, and the pressure drop value of the wheel cylinder pressure sensor is zero. At this time, if all the pressure drop values ​​in the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder and left front wheel cylinder are less than or equal to the critical value b, the OV normally open valve is determined to be normal in sealing; otherwise, the OV normally open valve is determined to be leaking.

[0015] Therefore, the present invention adopts the above detection device and detection method, which has the following beneficial effects: (1) The device has a simple structure and only requires simple profiles to build the stand, which is low in cost and highly economical and manufacturable; (2) Significantly improve testing efficiency and save manpower and material resources; (3) Test parameters can be adjusted according to R&D test requirements to meet the required test standards, which is highly flexible.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a function detection device for an ESP actuator according to the present invention.

[0018] Figure 2 The figure is a structural diagram of a function detection device for an ESP actuator according to the present invention.

[0019] Figure numerals: 1, TC normally open valve; 2, HSV normally closed valve; 31, first IV normally open valve; 32, second IV normally open valve; 41, first OV normally closed valve; 42, second OV normally closed valve; 5, plunger pump; 6, one-way valve; 7, accumulator; 8, ESP actuator pressure sensor; 9, motor; 10, external exhaust normally closed valve; 11, wheel cylinder; 12, wheel cylinder pressure sensor; 13, transparent connecting pipe; 14, test main circuit; 15, first test branch; 16, second test branch; 17, third test branch; 18, return oil pipeline. DETAILED DESCRIPTION

[0020] In order to make the purposes, technical solutions and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions.

[0021] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Example 1. like Figure 1 As shown, a schematic diagram of an ESP actuator function detection device includes two test main circuits 14. One end of the two test main circuits 14 is connected to the master cylinder chamber 1 and the master cylinder chamber 2, respectively, and the other end of the two test main circuits 14 is connected to the left rear wheel cylinder and the right rear wheel cylinder, respectively. A TC normally open valve 1 and a first IV normally open valve 31 are provided in sequence on each test main circuit 14 in the direction from the master cylinder to the left rear wheel cylinder or the right rear wheel cylinder. The valves are located between the TC normally open valve 1 and the master cylinder chamber 2. The TC normally open valve 1 is connected in parallel to the HSV normally closed valve 2 via a first test branch 15. The TC normally open valve 1 is connected to the HSV normally closed valve 2 in parallel. A plunger pump 5 driven and controlled by a motor 9 is also provided between the valves 2. The plunger pump 5 is unidirectionally conducted from the HSV normally closed valve 2 to the TC normally open valve 1. The plunger pump 5 and the HSV normally closed valve 2 are respectively connected to the right rear wheel cylinder and the left rear wheel cylinder via a second test branch 16, and the second test branch 16 is provided with a first OV normally closed valve 41; one end of a third test branch 17 is connected between the TC normally open valve 1 and the first IV normally open valve 31, and the other end of the third test branch 17 is connected to the right front wheel cylinder or the left front wheel cylinder, and a second IV normally open valve 32 and a second OV normally closed valve 42 are provided on the third test branch 17.

[0024] The external pressure-building mechanism includes an electric cylinder and a master cylinder connected to the output end of the electric cylinder; the wheel cylinder assembly 11 includes a right front wheel cylinder, a left rear wheel cylinder, a right rear wheel cylinder and a left front wheel cylinder; the output end of the wheel cylinder assembly 11 is connected to the wheel cylinder pressure sensor 12 through four transparent connecting pipes 13, and the output ends of the four transparent connecting pipes 13 converge into an oil return line 18 connected to the external pressure-building mechanism. An external exhaust normally closed valve 10 is provided on the oil return line 18 in the direction from the wheel cylinder assembly 11 to the external pressure-building mechanism; the transparent connecting pipe 13 adopts a segmented pipeline structure with oil pipes at both ends and a quartz glass tube in the middle, and the outer cover of the quartz glass tube is provided with a transparent protective cover.

[0025] like Figure 2 As shown, a structural schematic diagram of an ESP actuator function detection device, an ESP actuator function detection device, including a test control terminal, an ESP actuator to be tested, an external pressure-building mechanism, an external exhaust normally closed valve 10, and a wheel cylinder assembly 11; the test control terminal includes an industrial computer and an ECU controller, the industrial computer is electrically connected to the ECU controller, the test control terminal is electrically connected to the ESP actuator to be tested, the external pressure-building mechanism, and the external exhaust normally closed valve 10, respectively, the external pressure-building mechanism is connected to the wheel cylinder assembly 11 via the ESP actuator to be tested, the wheel cylinder assembly 11 and the external pressure-building mechanism are both connected to the external exhaust normally closed valve 10, the wheel cylinder assembly 11 is provided with a wheel cylinder pressure sensor 12, the ESP actuator to be tested is provided with an ESP actuator pressure sensor 8, and the wheel cylinder pressure sensor 12 and the ESP actuator pressure sensor 8 are electrically connected to the test control terminal; The test control terminal is used to control the pressure building of the external pressure building mechanism, the opening and closing of the ESP actuator to be tested and the external exhaust normally closed valve 10, thereby detecting the function of the ESP actuator to be tested.

[0026] Example 2. This embodiment provides a method for detecting the function of an ESP actuator, using the detection device described in Example 1. The method includes the following steps: S1. Exhaust: Exhaust the air inside the ESP actuator under test. The industrial computer sends a control command to the ECU controller to cause the brake fluid to flow through the ESP actuator under test to exhaust the internal air. Observe whether there are bubbles in the transparent connecting tube 13. If there are no bubbles, it is determined that the air inside the ESP actuator under test has been exhausted. Otherwise, it is determined that the air inside the ESP actuator under test has not been exhausted. S2. Test the following functions of the ESP actuator: active pressure buildup and pressure sensor calibration, TC normally open valve 1 sealing test, IV normally open valve sealing test, OV normally closed valve sealing test.

[0027] Step S1 specifically includes the following steps: S11. Empty the air in the test main circuit 14 and the first test branch 15: Use the industrial computer to send a control instruction to the ECU controller to control the operation of the motor 9, so that the brake fluid in the master cylinder flows into the ESP actuator to be tested. At the same time, open the HSV normally closed valve 2 and the external exhaust normally closed valve 10, so that the brake fluid flows from the master cylinder into the two test main circuits 14 respectively. Part of the brake fluid flowing into the test main circuit 14 flows into the first test branch 15 and flows out through the output end of the HSV normally closed valve 2. It is then pumped out from the first test branch 15 through the plunger pump 5. 5 output end into the test main circuit 14, and the other part flows out from the output end of the TC normally open valve 1 in the test main circuit 14. The two parts of brake fluid merge in the test main circuit 14 and flow into the wheel cylinder assembly 11 through the output ends of the first IV normally open valve 31 and the second IV normally open valve 32. The brake fluid in the wheel cylinder assembly 11 flows into the external exhaust normally closed valve 10 through the transparent connecting pipe 13. The brake fluid flows back to the master cylinder through the external exhaust normally closed valve 10. The gas in the brake fluid is discharged through the vent hole of the master cylinder oil tank. After a period of time, step S12 is executed; S12. Empty the air in the second test branch 16 and the third test branch 17: Use the industrial computer to send a control instruction to the ECU controller to control the operation of the motor 9, so that the brake fluid in the master cylinder flows into the ESP actuator to be tested, and at the same time open the HSV normally closed valve 2, the first OV normally closed valve 41, the second OV normally closed valve 42, and the external exhaust normally closed valve 10. The brake fluid flows from the master cylinder into the two test main circuits 14 respectively. Part of the brake fluid flowing into the test main circuit 14 flows into the first test branch 15 and flows out through the output end of the HSV normally closed valve 2. It flows into the test main circuit 14 from the output end of the first test branch 15 through the plunger pump 5, and the other part flows out from the output end of the TC normally open valve 1 in the test main circuit 14. The two parts of brake fluid merge in the test main circuit 14 and pass through the first The brake fluid flows out from the output ends of the IV normally open valve 31 and the second IV normally open valve 32, and the outflowing brake fluid is divided into three parts. The first part flows into the wheel cylinder assembly 11, the second part flows into the second test branch 16 and flows out through the output end of the first OV normally closed valve 41, and the third part flows into the third test branch 17 and flows out through the output end of the second OV normally closed valve 42. The brake fluid flowing out of the second and third parts merges and flows into the first test branch 15, flows into the test main circuit 14 through the plunger pump 5, and flows into the wheel cylinder assembly 11 through the output ends of the first IV normally open valve 31 and the second IV normally open valve 32. The brake fluid in the wheel cylinder assembly 11 flows into the external exhaust normally closed valve 10 through the transparent connecting pipe 13, and the brake fluid flows back to the master cylinder through the external exhaust normally closed valve 10. The gas in the brake fluid is discharged through the vent hole of the master cylinder oil pot; S13, looping steps S11 and S12 until no bubbles are observed in the brake fluid from the transparent connecting tube 13. The specific steps of the active pressure buildup and pressure sensor calibration described in step S2 are as follows: The industrial computer sends a control command to the ECU controller to control the operation of the motor 9, causing the brake fluid in the master cylinder to flow into the ESP actuator under test. At the same time, the TC normally open valve 1 is closed and the HSV normally closed valve 2 is opened, allowing the brake fluid to flow from the master cylinder into the first test branch 15, out through the output end of the HSV normally closed valve 2, and then into the test main circuit 14 through the plunger pump 5. It flows through the output ends of the first IV normally open valve 31 and the second IV normally open valve 32 and into the wheel cylinders. Finally, the wheel cylinder pressure sensor 12 reads the pressure values ​​of the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder, and left front wheel cylinder, respectively, which are P11, P12, P21, and P22. At the same time, the ECU controller reads the pressure value P3 of the ESP actuator pressure sensor 8. The right front wheel cylinder pressure value P11 and the right rear wheel cylinder pressure value P21 are selected for comparative analysis. If any pressure value of P11 or P21 is zero or both pressure values ​​are zero, it is determined that the active pressure buildup is abnormal; when both pressure values ​​are not zero, the difference between the two pressure values ​​is determined. If the difference in pressure values ​​is greater than the set value, it is determined that the unilateral active pressure buildup is abnormal; select the pressure value P21 or the pressure value P22. If P21 or P22 is equal to P3, it is determined that the wheel cylinder pressure sensor 12 transmits a normal signal. Otherwise, it is determined whether the difference between the pressure value P21 or P22 and the pressure value P3 exceeds the set value. If so, it is determined that the wheel cylinder pressure sensor 12 transmits an abnormal signal. Otherwise, it is determined that the wheel cylinder pressure sensor 12 transmits a normal signal. If not, it is determined that the wheel cylinder pressure sensor 12 transmits a normal signal. If the active pressure buildup function test is normal, it is determined that the HSV normally closed valve 2 functions normally.

[0028] The specific steps of the TC normally open valve 1 sealing detection in step S2 are as follows: The industrial computer sends a control command to the ECU controller to control the operation of the motor 9, which controls the electric cylinder to push the master cylinder so that the brake fluid flows from the master cylinder into the test main circuit 14, through the output end of the TC normally open valve 1, into the first IV normally open valve 31 and the second IV normally open valve 32, and then into the wheel cylinder assembly 11 through the output ends of the first IV normally open valve 31 and the second IV normally open valve 32. When the thrust reaches 500N, the motor 9 stops running, and the industrial computer sends a control command to the ECU controller to close the TC normally open valve 1. The industrial computer also sends a control command to the ECU controller to control the operation of the motor 9, causing the electric cylinder to return. After the electric cylinder returns, the voltage is stabilized for 3-5 seconds, and the pressure sensor value of any wheel cylinder among the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder, and left front wheel cylinder is read and recorded as P4. This state is maintained for 30 seconds, and the value of the wheel cylinder pressure sensor 12 is read again and recorded as P5. If the value of P4-P5 is less than or equal to 3 bar, the TC valve is judged to be normal in sealing, otherwise it is judged that the TC valve is leaking.

[0029] The specific steps of the IV normally open valve sealing detection described in step S2 are as follows: The industrial computer sends a control instruction to the ECU controller to close the first IV normally open valve 31 and the second IV normally open valve 32, and controls the motor 9 to operate and push the electric cylinder to a certain force value X1, so that the brake fluid flows from the master cylinder into the test main circuit 14, passes through the output end of the TC normally open valve 1, and flows into the first IV normally open valve 31 and the second IV normally open valve 32, and maintains this state for 30 seconds. The pressure rise values ​​of the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder, and left front wheel cylinder in the wheel cylinder assembly 11 within 30 seconds are read; the IV normally open valve is in a closed state, blocking the passage of brake fluid, so the pressure rise value of the wheel cylinder pressure sensor 12 is zero. At this time, if all the pressure rise values ​​of the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder, and left front wheel cylinder are equal to 0 or less than the critical value a, it is determined that the sealing of the IV normally open valve is normal; otherwise, it is determined that the IV normally open valve is leaking.

[0030] The specific steps of the OV normally closed valve sealing detection described in step S2 are as follows: The industrial computer sends a control instruction to the ECU controller to control the operation of the motor 9, pushing the electric cylinder to a certain force value X2, so that the brake fluid flows from the master cylinder into the test main circuit 14, passes through the output end of the TC normally open valve 1, and flows into the first IV normally open valve 31 and the second IV normally open valve 32. The brake fluid flowing out of the output ends of the first IV normally open valve 31 and the second IV normally open valve 32 partially flows into the wheel cylinder assembly 11, and the remaining portion flows into the first OV normally closed valve 41 and the second OV normally closed valve 42. The first OV normally closed valve 41 and the second OV normally closed valve 42 are closed by default, blocking the passage of brake fluid. The pressure drop value of the wheel cylinder pressure sensor 12 is zero. At this time, if all the pressure drop values ​​in the right front wheel cylinder, the left rear wheel cylinder, the right rear wheel cylinder, and the left front wheel cylinder are less than or equal to the critical value b, the OV normally open valve is determined to be properly sealed; otherwise, the OV normally open valve is determined to be leaking.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An ESP actuator function detection device, characterized in that: The test control terminal includes a test control end, an ESP actuator to be tested, an external pressure-building mechanism, an external exhaust normally closed valve, and a wheel cylinder assembly; the test control end includes an industrial computer and an ECU controller, the industrial computer is electrically connected to the ECU controller, the test control end is electrically connected to the ESP actuator to be tested, the external pressure-building mechanism, and the external exhaust normally closed valve, respectively, the external pressure-building mechanism is connected to the wheel cylinder assembly via the ESP actuator to be tested, the wheel cylinder assembly and the external pressure-building mechanism are both connected to the external exhaust normally closed valve, a wheel cylinder pressure sensor is provided on the wheel cylinder assembly, an ESP actuator pressure sensor is provided on the ESP actuator to be tested, and the wheel cylinder pressure sensor and the ESP actuator pressure sensor are both electrically connected to the test control end; The test control terminal is used to control the pressure building of the external pressure building mechanism, the opening and closing of the ESP actuator to be tested, and the external exhaust normally closed valve, thereby detecting the function of the ESP actuator to be tested.

2. The ESP actuator function detection device according to claim 1, characterized in that: The external pressure-building mechanism includes an electric cylinder and a master cylinder connected to the output end of the electric cylinder; the wheel cylinder assembly includes a right front wheel cylinder, a left rear wheel cylinder, a right rear wheel cylinder, and a left front wheel cylinder; the output end of the wheel cylinder assembly is connected to the wheel cylinder pressure sensor via four transparent connecting pipes, and the output ends of the four transparent connecting pipes converge into a return oil line that communicates with the external pressure-building mechanism. An external exhaust normally closed valve is installed on the return oil line, in the direction from the wheel cylinder assembly to the external pressure-building mechanism; The transparent connecting pipe adopts a segmented pipeline structure with oil pipes at both ends and a quartz glass tube in the middle, and the outer cover of the quartz glass tube is provided with a transparent protective cover.

3. The ESP actuator function detection device according to claim 2, characterized in that: The ESP actuator to be tested includes two test main circuits, one end of the two test main circuits is connected to the master cylinder chamber 1 and the master cylinder chamber 2 of the master cylinder respectively, and the other end of the two test main circuits is connected to the left rear wheel cylinder and the right rear wheel cylinder respectively. A TC normally open valve and a first IV normally open valve are sequentially arranged on each test main circuit in the direction from the master cylinder to the left rear wheel cylinder or the right rear wheel cylinder. The TC normally open valve is connected in parallel with the HSV normally closed valve through the first test branch. A valve is also arranged between the TC normally open valve and the HSV normally closed valve through the motor. The drive-controlled plunger pump is unidirectionally conducted from the HSV normally closed valve to the TC normally open valve. The plunger pump and the HSV normally closed valve are respectively connected to the right rear wheel cylinder and the left rear wheel cylinder via the second test branch, and the second test branch is provided with a first OV normally closed valve; one end of the third test branch is connected between the TC normally open valve and the first IV normally open valve, and the other end of the third test branch is connected to the right front wheel cylinder or the left front wheel cylinder, and the third test branch is provided with a second IV normally open valve and a second OV normally closed valve.

4. A method for detecting the function of an ESP actuator, characterized in that: Using the detection device according to any one of claims 1 to 3, the method comprises the following steps: S1. Exhaust: Exhaust the air inside the ESP actuator under test. The industrial computer sends a control command to the ECU controller to make the brake fluid flow through the ESP actuator under test to exhaust the internal air. Observe whether there are bubbles in the transparent connecting tube. If there are no bubbles, it is determined that the air inside the ESP actuator under test has been exhausted. Otherwise, it is determined that the air inside the ESP actuator under test has not been exhausted. S2. Test the following functions of the ESP actuator: active pressure buildup and pressure sensor calibration, TC normally open valve sealing test, IV normally open valve sealing test, OV normally closed valve sealing test.

5. The ESP actuator function detection method according to claim 4, characterized in that: Step S1 specifically includes the following steps: S11. Empty the air in the test main circuit and the first test branch circuit: Use the industrial computer to send a control instruction to the ECU controller to control the operation of the motor, so that the brake fluid in the master cylinder flows into the ESP actuator to be tested. At the same time, the HSV normally closed valve and the external exhaust normally closed valve are opened, so that the brake fluid flows from the master cylinder into the two test main circuits respectively. Part of the brake fluid flowing into the test main circuit flows into the first test branch circuit and out through the output end of the HSV normally closed valve. Then, it flows into the test main circuit from the output end of the first test branch circuit through the plunger pump. The other part flows out from the output end of the TC normally open valve in the test main circuit. The two parts of brake fluid merge in the test main circuit and flow into the wheel cylinder assembly through the output ends of the first IV normally open valve and the second IV normally open valve. The brake fluid in the wheel cylinder assembly flows into the external exhaust normally closed valve through the transparent connecting pipe. The brake fluid flows back to the master cylinder through the external exhaust normally closed valve. The gas in the brake fluid is discharged through the vent hole of the master cylinder oil pot. After a period of time, step S12 is executed; S12. Empty the air in the second test branch and the third test branch: Use the industrial computer to send a control instruction to the ECU controller to control the operation of the motor, so that the brake fluid in the master cylinder flows into the ESP actuator to be tested, and at the same time open the HSV normally closed valve, the first OV normally closed valve, the second OV normally closed valve, and the external exhaust normally closed valve. The brake fluid flows from the master cylinder into the two test main circuits respectively. Part of the brake fluid flowing into the test main circuit flows into the first test branch and flows out through the output end of the HSV normally closed valve, and flows into the test main circuit from the output end of the first test branch through the plunger pump. The other part flows out from the output end of the TC normally open valve in the test main circuit. The two parts of brake fluid merge in the test main circuit and pass through the third test branch. The brake fluid flows out from the output ends of the first and second IV normally open valves, and the outflowing brake fluid is divided into three parts. The first part flows into the wheel cylinder assembly, the second part flows into the second test branch and flows out through the output end of the first OV normally closed valve, and the third part flows into the third test branch and flows out through the output end of the second OV normally closed valve. The brake fluid flowing out of the second and third parts merges and flows into the first test branch, flows into the test main circuit through the plunger pump, and flows into the wheel cylinder assembly through the output ends of the first and second IV normally open valves. The brake fluid in the wheel cylinder assembly flows into the external exhaust normally closed valve through the transparent connecting pipe, and the brake fluid flows back to the master cylinder through the external exhaust normally closed valve. The gas in the brake fluid is discharged through the vent hole of the master cylinder oil pot; S13. Repeat steps S11 and S12 until no bubbles are found in the brake fluid observed through the transparent connecting tube.

6. The ESP actuator function detection method according to claim 4, characterized in that: The specific steps of active pressure building and pressure sensor calibration described in step S2 are as follows: The industrial computer sends a control instruction to the ECU controller to control the operation of the motor, so that the brake fluid in the master cylinder flows into the ESP actuator to be tested. At the same time, the TC normally open valve is closed and the HSV normally closed valve is opened to allow the brake fluid to flow from the master cylinder into the first test branch and out through the output end of the HSV normally closed valve. Then, the brake fluid flows into the test main circuit through the plunger pump, passes through the output ends of the first IV normally open valve and the second IV normally open valve, and flows into the wheel cylinder. Finally, the wheel cylinder pressure sensors read the pressure values ​​of the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder, and left front wheel cylinder, which are P11, P12, P21, and P22, respectively. At the same time, the ECU controller reads the pressure value P3 of the ESP actuator pressure sensor. The right front wheel cylinder pressure value P11 and the right rear wheel cylinder pressure value P21 are selected for comparison and analysis. If either or both pressure values ​​P11 and P21 are zero, the active pressure buildup is determined to be abnormal. If both pressure values ​​are not zero, the difference between the two pressure values ​​is determined. If the difference in the pressure values ​​is greater than the set value, it is determined that the active pressure buildup on one side is abnormal. Select pressure value P21 or pressure value P22. If P21 or P22 is equal to P3, determine that the wheel cylinder pressure sensor transmission signal is normal. Otherwise, determine whether the difference between one of the pressure values ​​P21 or P22 and pressure value P3 exceeds the set value. If so, determine that the wheel cylinder pressure sensor transmission signal is abnormal. Otherwise, determine that the wheel cylinder pressure sensor transmission signal is normal. If the active pressure buildup function test is normal, determine that the HSV normally closed valve function is normal.

7. The ESP actuator function detection method according to claim 4, characterized in that: The specific steps of the TC normally open valve sealing detection described in step S2 are as follows: The industrial computer sends a control command to the ECU controller to control the motor operation, control the electric cylinder to push the master cylinder so that the brake fluid flows from the master cylinder into the test main circuit through the output end of the TC normally open valve into the first IV normally open valve and the second IV normally open valve, and then into the wheel cylinder assembly through the output end of the first IV normally open valve and the second IV normally open valve. When the thrust reaches 500N, the motor operation stops, and the industrial computer sends a control command to the ECU controller to close the TC normally open valve. The industrial computer sends a control command to the ECU controller to control the motor operation and return the electric cylinder. After the electric cylinder returns, the voltage is stabilized for 3-5 seconds. At this time, the pressure sensor value of any wheel cylinder among the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder and left front wheel cylinder is recorded as P4. This state is maintained for 30 seconds, and the pressure sensor value of this wheel cylinder is read again and recorded as P5. If the value of P4-P5 is less than or equal to 3 bar, the TC valve is judged to be normal in sealing, otherwise it is judged that the TC valve is leaking.

8. The ESP actuator function detection method according to claim 4, characterized in that: The specific steps of the IV normally open valve sealing detection described in step S2 are as follows: The industrial computer sends a control instruction to the ECU controller to close the first IV normally open valve and the second IV normally open valve, controls the motor to drive the electric cylinder to a certain force value X1, so that the brake fluid flows from the master cylinder into the test main circuit, passes through the output end of the TC normally open valve, and flows into the first IV normally open valve and the second IV normally open valve, and maintains this for 30 seconds. The pressure rise values ​​of the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder and left front wheel cylinder in the wheel cylinder assembly within 30 seconds are read; the IV normally open valve is in a closed state, blocking the passage of brake fluid, so the pressure rise value of the wheel cylinder pressure sensor is zero. At this time, if all the pressure rise values ​​in the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder and left front wheel cylinder are equal to 0 or less than the critical value a, it is determined that the sealing of the IV normally open valve is normal; otherwise, it is determined that the IV normally open valve is leaking.

9. The ESP actuator function detection method according to claim 4, characterized in that: The specific steps of the OV normally closed valve sealing detection described in step S2 are as follows: The industrial computer sends control instructions to the ECU controller to control the operation of the motor, pushing the electric cylinder to a certain force value X2, so that the brake fluid flows from the master cylinder into the test main circuit, passes through the output end of the TC normally open valve, and flows into the first IV normally open valve and the second IV normally open valve. Part of the brake fluid flowing out of the output ends of the first IV normally open valve and the second IV normally open valve flows into the wheel cylinder assembly, and the other part flows into the first OV normally closed valve and the second OV normally closed valve; the first OV normally closed valve and the second OV normally closed valve are closed by default, blocking the passage of brake fluid, and the pressure drop value of the wheel cylinder pressure sensor is zero. At this time, if all the pressure drop values ​​in the right front wheel cylinder, left rear wheel cylinder, right rear wheel cylinder and left front wheel cylinder are less than or equal to the critical value b, the OV normally open valve is determined to be normal in sealing; otherwise, the OV normally open valve is determined to be leaking.

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