Valve testing system and integrated hydraulic braking system
By designing a valve test system including a brake hydraulic cylinder, an isolation valve and a booster chamber, the problem of large error and low efficiency of the sealing test of pressure control valves in the prior art is solved, and more accurate and efficient test results are achieved.
Patent Information
- Application Number
- CN202411657439.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-02-28
AI Technical Summary
The prior art has problems such as large test errors and low testing efficiency when testing the sealing properties of pressure control valves, especially in single valve tooling test and pressure-keeping test for building a pressure chamber after assembly into a hydraulic braking system.
A valve testing system is designed, which includes the first and second brake hydraulic cylinders, an isolation valve, a wheel cylinder group and a power chamber. By controlling the switches of the isolation valve and the power chamber, a pressure difference is established and balanced to accurately test the sealing of the measured pressure control valve.
It improves the accuracy and efficiency of the sealing test of the pressure control valve, reduces the impact of the isolation valve on the test results, and can effectively screen out abnormal pressure control valves.
Smart Images
Figure CN119533803A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of vehicle hydraulic brake parts testing, and in particular, relates to a valve testing system and an integrated hydraulic brake system. Background Art
[0002] With the rapid development of new energy vehicles, the demand for intelligent and electrified vehicles is getting higher and higher. Therefore, the electronically controlled power-assisted braking system is widely used, which puts forward the demand for valve detection inside the electronically controlled braking system.
[0003] There are two main methods for testing the sealing of pressure control valves in the current industry. The first method is to make a special single-valve test tool to perform a single-valve sealing test. The second method is to build up pressure in the pressure chamber after the pressure control valve is assembled into a brake assembly and then control the pressure control valve to maintain pressure and test the leakage of the pressure control valve.
[0004] The main disadvantages of the single-valve tooling test of the pressure control valve are low overall test efficiency, the test results are greatly affected by external tooling fixtures, and the abnormal single-valve pressure control valve cannot be accurately identified and screened. The overall test error of the pressure chamber pressure holding test after assembling into the hydraulic brake system product is large, especially the impact of other valve leakage cannot be fully identified. In general, the current methods for testing pressure control valve leakage have problems such as large test errors and overall low test efficiency. Summary of the invention
[0005] In order to solve the above technical problems, the present application provides a valve testing system and an integrated hydraulic brake system with low error and high testing efficiency.
[0006] The present application provides a valve testing system, which includes: a first brake hydraulic cylinder, a second brake hydraulic cylinder, a first isolation valve, a second isolation valve, a first wheel cylinder group, a second wheel cylinder group, and a power-assisting chamber. One end of the first isolation valve is connected to the first brake hydraulic cylinder, and the other end is connected to the first pressure control valve to be tested, so as to control whether the first brake hydraulic cylinder and the first pressure control valve to be tested are connected; one end of the second isolation valve is connected to the second brake hydraulic cylinder, and the other end is connected to the second pressure control valve to be tested, so as to control whether the second brake hydraulic cylinder and the second pressure control valve to be tested are connected; the first wheel cylinder group is connected to the pipeline between the first isolation valve and the first pressure control valve to be tested; the second wheel cylinder group is connected to the pipeline between the second isolation valve and the second pressure control valve to be tested; the power-assisting chamber is connected to the first pressure control valve to be tested and the second pressure control valve to be tested, so as to pressurize the first wheel cylinder group and the second wheel cylinder group.
[0007] Preferably, the valve testing system further comprises: a controller and a motor; the controller is used to control the motor to pressurize the first wheel cylinder group and the second wheel cylinder group through the power-assisting chamber.
[0008] Preferably, the controller is used to perform the following steps: close the first isolation valve and the second isolation valve, and control the power-assisting chamber to establish a first pressure in the first wheel cylinder group and the second wheel cylinder group through the opened first measured pressure control valve and the opened second measured pressure control valve; after closing the first measured pressure control valve and opening the second measured pressure control valve, control the power-assisting chamber to increase the pressure to establish a second pressure in the second wheel cylinder group through the opened second measured pressure control valve, wherein the second pressure is greater than the first pressure; control the first hydraulic brake cylinder to establish a first pressure in the pipeline connecting the first hydraulic brake cylinder and the connected first isolation valve; obtain a first pressure change value in the first wheel cylinder group after a first preset time; and determine the sealing performance of the first measured pressure control valve based on the first pressure change value.
[0009] Preferably, the controller is also used to execute a test case of the second tested pressure control valve, and the steps are as follows: close the first isolation valve and the second isolation valve, and control the power-assisting chamber to establish a first pressure in the first wheel cylinder group and the second wheel cylinder group through the opened first tested pressure control valve and the opened second tested pressure control valve; the controller closes the second tested pressure control valve, opens the first tested pressure control valve, and then controls the power-assisting chamber to increase pressure to establish a second pressure in the first wheel cylinder group through the opened first tested pressure control valve; the controller controls the second hydraulic brake cylinder to establish a first pressure in the pipeline connecting the second hydraulic brake cylinder and the connected second isolation valve; obtains a second pressure change value in the second wheel cylinder group after a second preset time; and determines the sealing of the second tested pressure control valve based on the second pressure change value.
[0010] Preferably, the test system further comprises an electric cylinder device, which keeps the push rod position of the first brake hydraulic cylinder or the second brake hydraulic cylinder fixed for the first preset time.
[0011] Preferably, the controller of the test system controls the electric cylinder to keep the push rod position of the first or second brake cylinder fixed, and maintain the pressure of the pipeline between the first brake cylinder and the first isolation valve or the pipeline between the second brake cylinder and the second isolation valve.
[0012] Preferably, the transmission shaft of the motor is connected to the power-assisting chamber, and the motor can control the power-assisting chamber through the transmission shaft to perform pressure increase and decrease operations on the first wheel cylinder group and the second wheel cylinder group.
[0013] Preferably, the power assist chamber is connected to the first measured pressure control valve and the second measured pressure control valve through a three-way pipeline. When the first measured pressure control valve and the second pressure control valve are both opened, the three-way pipeline can connect the first wheel cylinder group and the second wheel cylinder group.
[0014] Preferably, the first wheel cylinder group includes two wheel cylinders, and the two wheel cylinders are connected to the first measured pressure control valve through a three-way pipeline.
[0015] The present application also provides an integrated hydraulic brake system, in which the above-mentioned valve testing system is integrated.
[0016] The present application can reduce the influence of the isolation valve by creating a pressure difference at both ends of the pressure control valve under test and balancing the pressure difference at both ends of the isolation valve connected thereto, thereby improving the accuracy of the sealing test of the pressure control valve under test, and can test the first pressure control valve and the second pressure control valve under test respectively. Therefore, the valve testing system of the present application has low error and high testing efficiency.
[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation method is described below, and the detailed explanation is as follows in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the structure of a valve testing system according to an example of the present application.
[0019] Figure 2 This is a schematic diagram of the pressure state of a valve testing system according to an example of the present application when testing a first pressure control valve under test.
[0020] Figure 3 This is a schematic diagram of the pressure state of the valve testing system of an example of the present application when testing the second pressure control valve under test.
[0021] Among them, 10-the first brake hydraulic cylinder, 11-the second brake hydraulic cylinder, 12-the first isolation valve, 13-the power-assisting chamber, 14-the second isolation valve, 15-the first measured pressure control valve, 16-the second measured pressure control valve, 17-the first wheel cylinder group, 18-the second wheel cylinder group. DETAILED DESCRIPTION
[0022] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The drawings provide specific implementation methods of the present application, and the present application will be described in detail below in conjunction with the drawings and examples.
[0023] Figure 1 This is a schematic diagram of the structure of a valve testing system according to an example of the present application. Figure 1 As shown, the valve testing system includes: a first brake hydraulic cylinder 10 , a second brake hydraulic cylinder 11 , a first isolation valve 12 , a boosting chamber 13 , a second isolation valve 14 , a first wheel cylinder group 17 , and a second wheel cylinder group 18 .
[0024] Among them, the brake hydraulic cylinder is a key actuator in the hydraulic brake system, which can be used to convert hydraulic energy into mechanical energy to achieve the braking force of the wheel brake. The brake hydraulic cylinder usually works with the brake master cylinder (also known as the brake master cylinder), hydraulic pipeline, wheel cylinder (also known as the brake slave cylinder) and other components, and pushes the brake wheel cylinder piston to move through the pressure transmission of hydraulic oil, so that the friction block of the brake contacts the brake disc or brake drum to generate braking force. In one embodiment, the first brake hydraulic cylinder 10 and the second brake hydraulic cylinder 11 are both provided with hydraulic push rods, and the pressure increase and decrease operation of the hydraulic cylinder can be achieved by pushing and pulling the hydraulic push rods.
[0025] One end of the first isolation valve 12 is connected to the first brake hydraulic cylinder 10, and the other end is connected to the first measured pressure control valve 15 to control whether the first brake hydraulic cylinder 10 and the first measured pressure control valve 15 are connected. One end of the second isolation valve 14 is connected to the second brake hydraulic cylinder 11, and the other end is connected to the second measured pressure control valve 16 to control whether the second brake hydraulic cylinder 11 and the second measured pressure control valve 16 are connected.
[0026] The first wheel cylinder group 17 is connected to the pipeline between the first isolation valve 12 and the first pressure control valve 15. The second wheel cylinder group 18 is connected to the pipeline between the second isolation valve 14 and the second pressure control valve 16. The first wheel cylinder group 17 and the second wheel cylinder group 18 are closed structures inside, and can act as sealed pressure vessels when performing a sealing test on the pressure control valve to be tested.
[0027] The boost chamber 13 is connected to the first measured pressure control valve 15 and the second measured pressure control valve 16 for pressurizing the first wheel cylinder group 17 and the second wheel cylinder group 18 .
[0028] In one embodiment, the valve testing system further includes a controller (not shown) and a motor (not shown). The controller is used to control the motor, and the transmission shaft of the motor is connected to the boosting chamber 13. The controller can control the boosting chamber 13 to increase or decrease the pressure of the first wheel cylinder group 17 and the second wheel cylinder group 18 in the pipeline by controlling the rotation of the motor.
[0029] Specifically, the motor drive shaft is connected to the boost piston inside the boost chamber 13, driving the boost piston to slide in the boost chamber 13. The motor drive shaft and the boost piston are connected by a worm gear, a worm and a rack. The transmission output of the motor is to the worm gear. The worm gear and the rack are respectively arranged on both sides of the worm gear. The rack is connected to the boost piston through a connecting rod. The motor drives the worm gear and drives the rotation of the worm gear. As the worm gear rotates, the rack is driven to move, so as to convert the rotational motion of the motor into the linear movement of the boost piston, thereby realizing the pressure increase and pressure decrease operations on the first wheel cylinder group 17 and the second wheel cylinder group 18 in the pipeline.
[0030] In one embodiment, the controller may further execute a test case for the first tested pressure control valve 15, and the specific steps are as follows: Close the first isolation valve 12 and the second isolation valve 14, and control the boosting chamber 13 to establish a first pressure in the first wheel cylinder group 17 and the second wheel cylinder group 18 through the opened first measured pressure control valve 15 and the opened second measured pressure control valve 16; After closing the first measured pressure control valve 15 and opening the second measured pressure control valve 16, the boost chamber 13 is controlled to increase the pressure so as to establish a second pressure in the second wheel cylinder group 18 through the opened second measured pressure control valve 16, wherein the second pressure is greater than the first pressure.
[0031] Since at this time there is a pressure difference formed by the first pressure and the second pressure at both ends of the first tested pressure control valve 15, the sealing test of the first tested pressure control valve 15 can be directly performed through this pressure difference. However, at this time there is also a pressure difference formed by the first pressure and the second pressure at both ends of the first isolation valve 12. If the pressure difference here is not balanced, the influence of the leakage of the first isolation valve 12 on the test cannot be avoided. Therefore, in order to improve the accuracy of the test, the controller is also used to perform the following steps: The controller controls the first hydraulic brake cylinder 10 so that a first pressure is established in the pipeline communicating with the first isolation valve 12 connected to the first hydraulic brake cylinder 10, and at this time, the pressures at both ends of the first isolation valve 12 are balanced; At this time, the pressure state of the valve test system is as follows Figure 2 As shown; Acquire a first pressure change value in a first wheel cylinder group after a first preset time; The sealing performance of the first tested pressure control valve is determined according to the first pressure change value.
[0032] In one embodiment, the controller can also execute a test case for the second pressure control valve 16 to be tested. This test case can be executed sequentially with the test case for the first pressure control valve 15 to be tested. After the test case for the first pressure control valve 15 to be tested is completed, the push rods of the first brake hydraulic cylinder 10 and the second brake hydraulic cylinder 11 can be returned to their positions, the first isolation valve 12 and the second isolation valve 14 can be opened, and the first pressure control valve 15 and the second pressure control valve 16 to be tested can be opened to balance the pressure in the system pipeline, so that the valve test system returns to the default state. The test case for the second pressure control valve 16 to be tested can be executed, and the controller executes the following steps: Close the first isolation valve 12 and the second isolation valve 14, and control the boosting chamber 13 to establish a first pressure in the first wheel cylinder group 17 and the second wheel cylinder group 18 through the opened first measured pressure control valve 15 and the opened second measured pressure control valve 16; The controller closes the second measured pressure control valve 16 and opens the first measured pressure control valve 15, and then controls the boosting chamber 13 to increase the pressure, so as to establish a second pressure in the first wheel cylinder group 17 through the opened first measured pressure control valve 15; The controller controls the second hydraulic brake cylinder 11 so that a first pressure is established in a pipeline communicating with the second isolation valve 14 connected to the second hydraulic brake cylinder 11; At this time, the pressure state of the valve test system is as follows Figure 3 As shown; Acquire a second pressure change value in the second wheel cylinder group 18 after a second preset time; The sealing performance of the second tested pressure control valve is determined according to the second pressure change value.
[0033] In one embodiment, the valve testing system further includes an electric cylinder device (not shown), which is connected to the push rods of the first brake hydraulic cylinder 10 and the second brake hydraulic cylinder 11; the electric cylinder device can push and pull the push rods of the first brake hydraulic cylinder 10 and the second brake hydraulic cylinder 11 to achieve pressure increase and decrease operations.
[0034] In one embodiment, when the controller executes the test case, it is necessary to maintain the pressurized state of the first brake hydraulic cylinder 10 or the second brake hydraulic cylinder 11, and the controller maintains and fixes the push rod position of the first brake hydraulic cylinder 10 or the second brake hydraulic cylinder 11 by controlling the electric cylinder device.
[0035] Among them, when conducting the above-mentioned sealing test on the first tested pressure control valve 15, the controller needs to control the electric cylinder device to push the push rod of the first hydraulic brake cylinder 10 to establish a first pressure, and hold it for a first preset time. Therefore, the controller needs to control the electric cylinder device to keep the push rod position of the first hydraulic brake cylinder 10 fixed until the first preset time is met; similarly, when conducting the above-mentioned sealing test on the second tested pressure control valve 16, the controller needs to control the electric cylinder device to push the push rod of the second hydraulic brake cylinder 11 to establish a first pressure, and hold it for a second preset time. Therefore, the controller needs to control the electric cylinder device to keep the push rod position of the second hydraulic brake cylinder 11 fixed until the second preset time is met. After executing any test case, the controller controls the electric cylinder device to return the push rods of the first brake hydraulic cylinder 10 and the second brake hydraulic cylinder 11 to their original positions, and restore the system to the default state.
[0036] In one embodiment, the power assist chamber 13 is connected to the first measured pressure control valve 13 and the second measured pressure control valve 14 through a three-way pipe, so when the first measured pressure control valve 13 and the second measured pressure control valve 14 are opened, the above-mentioned three-way pipe is connected to balance the pressure inside the first wheel cylinder group 17 and the second wheel cylinder group 18.
[0037] In one embodiment, the first wheel cylinder group 17 includes two wheel cylinders (not shown), a first wheel cylinder and a second wheel cylinder, and the two wheel cylinders are connected to the first pressure control valve 15 to be tested through a three-way pipeline; and the valve test system structure is symmetrically arranged, the second wheel cylinder group 18 also includes two wheel cylinders (not shown), a third wheel cylinder and a fourth wheel cylinder, and the two wheel cylinders of the second wheel cylinder group 18 are connected to the second pressure control valve 16 to be tested through a three-way pipeline.
[0038] The present application also proposes an integrated hydraulic brake system, which has the above-mentioned valve testing system integrated therein. The integrated hydraulic brake system can perform sealing detection on the pressure control valve inside itself through the valve testing system.
[0039] Among them, the left front wheel cylinder, right rear wheel cylinder, right front wheel cylinder and left rear wheel cylinder of this integrated hydraulic brake system correspond to the first wheel cylinder, second wheel cylinder, third wheel cylinder and fourth wheel cylinder in the above-mentioned valve test system respectively.
[0040] Among them, if the integrated hydraulic brake system uses its internal valve test system to test the valve sealing, the integrated hydraulic brake system needs to be installed on the test bench, the test circuit needs to be connected, and it needs to be ensured that the valve test system has no leakage. After the valve test system is vented, the valve sealing test can be carried out.
[0041] Compared with the existing single-valve test of pressure control valves, the present application has the advantages of high efficiency, small test error and high test efficiency after the test results are affected by external tooling and fixtures; compared with the existing pressure control valve assembly and then performing a pressure maintenance test, it can avoid errors caused by valve leakage connected to the pressure control valve being tested, effectively screen the sealing conditions of the pressure control valves, ensure the performance of the integrated hydraulic brake system composed of this valve test system, and ensure the braking performance of the whole vehicle installed with this integrated hydraulic brake control system.
[0042] The above is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as a preferred embodiment as above, it is not intended to limit the present application. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.
Claims
1. A valve testing system, characterized in that: The system comprises: A first brake hydraulic cylinder and a second brake hydraulic cylinder; a first isolation valve, one end of which is connected to the first brake hydraulic cylinder, and the other end of which is connected to the first measured pressure control valve, so as to control whether the first brake hydraulic cylinder and the first measured pressure control valve are connected; a second isolation valve, one end of which is connected to the second brake hydraulic cylinder and the other end of which is connected to the second measured pressure control valve, so as to control whether the second brake hydraulic cylinder and the second measured pressure control valve are connected; a first wheel cylinder group, connected to a pipeline between the first isolation valve and the first measured pressure control valve; a second wheel cylinder group, connected to a pipeline between the second isolation valve and the second measured pressure control valve; The boost chamber is connected to the first measured pressure control valve and the second measured pressure control valve, and is used to pressurize the first wheel cylinder group and the second wheel cylinder group.
2. The valve testing system according to claim 1, characterized in that: The valve testing system further includes: a controller and a motor; the controller is used to control the motor to pressurize the first wheel cylinder group and the second wheel cylinder group through the power-assisting chamber.
3. The valve testing system according to claim 2, characterized in that: The controller is used to perform the following steps: closing the first isolation valve and the second isolation valve, and controlling the boosting chamber to establish a first pressure in the first wheel cylinder group and the second wheel cylinder group through the opened first measured pressure control valve and the opened second measured pressure control valve; After closing the first measured pressure control valve and opening the second measured pressure control valve, controlling the boosting chamber to increase pressure, so as to establish a second pressure in the second wheel cylinder group through the opened second measured pressure control valve, wherein the second pressure is greater than the first pressure; Controlling the first hydraulic brake cylinder so that the first pressure is established in a pipeline communicating with a first isolation valve connected to the first hydraulic brake cylinder; Acquire a first pressure change value in the first wheel cylinder group after a first preset time; The sealing performance of the first measured pressure control valve is determined according to a first pressure change value inside the first wheel cylinder group.
4. The valve testing system according to claim 3, characterized in that: The controller is also used to perform the following steps: closing the first isolation valve and the second isolation valve, and controlling the boosting chamber to establish a first pressure in the first wheel cylinder group and the second wheel cylinder group through the opened first measured pressure control valve and the opened second measured pressure control valve; The controller closes the second measured pressure control valve, opens the first measured pressure control valve, and controls the boosting chamber to increase pressure, so as to establish a second pressure in the first wheel cylinder group through the opened first measured pressure control valve; The controller controls the second hydraulic brake cylinder so that the first pressure is established in the pipeline communicating with the second isolation valve connected to the second hydraulic brake cylinder; Acquire a second pressure change value in the second wheel cylinder group after a second preset time; The sealing performance of the second measured pressure control valve is determined according to a second pressure change value inside the second wheel cylinder group.
5. The test system according to claim 3, characterized in that: The test system also includes an electric cylinder device, which is connected to the push rods of the first brake hydraulic cylinder and the second brake hydraulic cylinder; the electric cylinder device can push and pull the push rods of the first brake hydraulic cylinder and the second brake hydraulic cylinder to achieve the pressure increase and decrease operation.
6. The test system according to claim 5, characterized in that: The controller of the test system controls the electric cylinder device to keep the push rod position of the first brake hydraulic cylinder or the second brake hydraulic cylinder fixed for the first preset time.
7. The test system according to claim 2, characterized in that: The transmission shaft of the motor is connected to the power-assisting chamber, and the motor can control the power-assisting chamber to perform pressure increase and decrease operations on the first wheel cylinder group and the second wheel cylinder group through the transmission shaft.
8. The test system according to claim 1, wherein: The power assist chamber is connected to the first measured pressure control valve and the second measured pressure control valve through a three-way pipeline. When the first measured pressure control valve and the second pressure control valve are both opened, the three-way pipeline simultaneously connects the first wheel cylinder group and the second wheel cylinder group.
9. The test system according to claim 1, characterized in that: The first wheel cylinder group includes two wheel cylinders, and the two wheel cylinders are connected to the first measured pressure control valve through a three-way pipeline.
10. An integrated hydraulic brake system, characterized in that: The integrated hydraulic brake system has the valve testing system according to any one of claims 1 to 9 integrated therein.