A hydraulic ABS solenoid valve strength testing device and method

Abstract

A kind of hydraulic ABS solenoid valve strength testing device and testing method, testing device includes test tool, controller and hydraulic source, the test tool includes base, press screw, coil, sealing ring, plug, base is provided with hydraulic source communication cavity, installation cavity and buffer cavity, the hydraulic source communication cavity is communicated with hydraulic source, the buffer cavity is located at the two sides of installation cavity with hydraulic source communication cavity respectively and is communicated with installation cavity, press screw is sealedly connected with the side wall of installation cavity of base, coil is placed in press screw and is gap matched with press screw, sealing ring is placed between press screw and base, and is pressed on base by press screw, the sealing ring is positioned to the solenoid valve to be tested, the controller is electrically connected with coil and controls the on-off of the coil.This testing device needs small hydraulic flow, can quickly and accurately test the performance strength of solenoid valve;Detection cost is low, detection efficiency is high and the required tool placement space is small.

Description

Technical Field

[0001] This invention provides a method and apparatus for testing the strength of a hydraulic ABS solenoid valve. By testing the ultimate pressure resistance, conventional high and low temperature impact strength, and pulsed high and low temperature impact strength of the solenoid valve, the operational reliability of the ABS solenoid valve can be verified more quickly. Background Technology

[0002] The hydraulic ABS solenoid valve is an actuator (HCU) used in automotive anti-lock braking systems (ABS). It generates electromagnetic force by energizing a coil mounted on its housing, controlling the flow of brake fluid from the master cylinder to the wheel cylinders, thereby controlling the braking force applied to the wheels. Current performance testing of solenoid valves primarily involves testing them together with the ABS assembly. The ABS assembly includes a valve body, piston pump, motor, accumulator, steel balls, etc., with numerous interconnected parts. Leakage in any component can lead to the termination of the strength test, which is time-consuming. Testing the entire ABS assembly is prone to terminations and extended testing cycles due to factors other than the solenoid valve itself. In other words, while existing testing methods meet the requirements of the test indicators to some extent, they suffer from high testing costs and low efficiency. Furthermore, assembly testing requires supplying oil to all components except the solenoid valve. The hydraulic oil flow required for the system is far greater than that required for testing the solenoid valve itself, necessitating a high-energy hydraulic source, which increases costs and the overall size of the testing system, making it extremely inconvenient to use and transport. Because the existing testing methods are assembly tests, the performance testing of the solenoid valve body is not accurate enough. For example, the lifespan of the steel balls inside the solenoid valve cannot be accurately assessed. Therefore, the existing testing methods need to be improved. Summary of the Invention

[0003] In view of this, the present invention provides a strength testing device and method for hydraulic ABS solenoid valves.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A hydraulic ABS solenoid valve strength testing device includes a testing fixture, a controller, and a hydraulic source. The testing fixture includes a base, a pressure screw, a coil, a sealing ring, and a plug. The base has a hydraulic source connecting cavity, a mounting cavity, and a buffer cavity. The hydraulic source connecting cavity is connected to the hydraulic source. The buffer cavity and the hydraulic source connecting cavity are located on opposite sides of the mounting cavity and are both connected to the mounting cavity. The plug is sealed and installed on the other side of the buffer cavity. The pressure screw is sealed to the side wall of the mounting cavity of the base. The coil is placed inside the pressure screw and is clearance-fitted with the pressure screw. The sealing ring is placed between the pressure screw and the base and is pressed onto the base by the pressure screw. The sealing ring presses and positions the solenoid valve under test. The controller is electrically connected to the coil to control the coil's on / off state.

[0006] Specifically, the volume of the buffer cavity is determined as follows: In the formula, V is the volume of the buffer cavity, Ee is the effective bulk elastic modulus, including the equivalent elastic modulus of the oil itself and the wall of the closed cavity, Δq is the flow rate of the liquid flowing into the closed cavity, t1 is the de-energization time of the normally open valve, t2 is the energization time of the normally open valve, Δp is the pressure change of the closed cavity, Cg is the flow coefficient, A0 is the area of ​​the throttle orifice of the normally open solenoid valve, ρ is the density of the brake fluid, n is the number of steps, d is the diameter of the throttle orifice of the normally open valve, and Δp1 is the pressure difference before and after the throttle orifice.

[0007] Specifically, a groove is formed at the bottom of the screw, and the sealing ring is pressed into the groove. When the sealing ring is squeezed by the screw and the solenoid valve, a ring groove is formed at the bottom of the sealing ring from the inner ring. This ring groove cooperates with the sealing boss on the outer periphery of the solenoid valve.

[0008] Specifically, the pressure screw is also provided with a flat position.

[0009] The present invention also provides a method for testing the strength of a hydraulic ABS solenoid valve, wherein the test method is performed using the above-mentioned test device.

[0010] The test method is the ultimate pressure resistance test, which includes the following steps: Step (1): Place the normally open solenoid valve to be tested in the pressure screw, press it with the sealing ring, and lock it with the pressure screw; Step (2): Build up the hydraulic pressure to 25~35±1MPa; Step (3): Maintain the hydraulic pressure of 25~35MPa for 30s; Step (4): Depressurize the hydraulic pressure; Step (5): Observe whether the solenoid valve is damaged or deformed.

[0011] The test method is a conventional high and low temperature impact strength test, which includes the following steps:

[0012] Step (1): Place the normally open solenoid valve to be tested into the pressure screw, tighten it with the sealing ring, and lock it with the pressure screw; Step (2): Place the test device in a 20±2℃ temperature chamber, and pressurize it to 10MPa with the hydraulic power source at a frequency of 0.2778±0.0278Hz and then depressurize it; Step (3): Pressurize it 50,000 to 55,000 times; Step (4): Place the test device in a 50±2℃ temperature chamber, and pressurize it to 10MPa with the hydraulic power source at a frequency of 0.2778±0.0278Hz and then depressurize it; Step ( 5): Pressure build-up 50,000 to 55,000 times; Step (6): Place the testing device in a 75±2℃ temperature chamber, and use a hydraulic source to build up pressure to 10MPa and depressurize at a frequency of 0.2778±0.0278Hz; Step (7): Pressure build-up 50,000 to 55,000 times; Step (8): Place the testing device in a 100±2℃ temperature chamber, and use a hydraulic source to build up pressure to 10MPa and depressurize at a frequency of 0.2778±0.0278Hz; Step (9): Pressure build-up 60,000 to 65,000 times; Step (10): Place the testing device in a 75 ...10): Pressure build-up 60,000 to 65,000 times; Step (11): Place the testing device in a 75±2℃ temperature chamber, and use a hydraulic source to build up pressure to 10MPa and depressurize at a frequency of 0.2778±0.0278Hz; Step (12): Pressure build-up 60,000 to 65,000 times; Step (13): Place the testing device in a 75±2℃ temperature chamber, and use a hydraulic source to build up pressure to 10MPa and depressurize at a frequency of 0.2778±0.0278Hz; Step The test apparatus was placed in a 120±2℃ temperature chamber, and the hydraulic power source was pressurized to 10MPa and depressurized at a frequency of 0.2778±0.0278Hz; Step (11): pressurization 55,000 to 60,000 times; Step (12): the test apparatus was placed in a -20±2℃ freezing chamber, and the hydraulic power source was pressurized to 10MPa and depressurized at a frequency of 0.1667±0.0167Hz; Step (13): pressurization 25,000 to 30,000 times; Step (14): the test apparatus was placed in a -40±2℃ freezing chamber, and the hydraulic power source was pressurized to 10MPa and depressurized at a frequency of 0.1667±0.0167Hz; The source builds up pressure to 10MPa and releases pressure at a frequency of 0.1667±0.0167Hz; Step (15): Build up pressure 20,000 times; Step (16): Observe whether the solenoid valve is damaged or deformed; Step (17): Open the plug and the combination gasket; Step (18): The controller control coil is energized with a voltage of DC12±1V; Step (19): The hydraulic source builds up pressure to 15±1MPa; Step (20): Maintain the pressure of 15MPa for 30s; Step (21): Observe whether there is liquid flowing out of the buffer chamber.

[0013] The test method is a pulse high and low temperature impact strength test, which includes the following steps:

[0014] Step (1): Place the normally open solenoid valve under test below the sealing ring and tighten it with the pressure screw; Step (2): Place the test apparatus in a 20±2℃ temperature chamber; Step (3): energize the controller coil with a voltage of DC12±1V; Step (4): build up the hydraulic pressure to 2.5±0.5MPa; Step (5): energize the controller coil with pulses, with an energization time of 8ms and a de-energization time of 8ms, and repeat the de-energization 5 times; Step (6): energize the controller coil with pulses, and depressurize the hydraulic pressure; Step (7): Repeat steps (3) to (6) for a total of 800 times; Step (8): Repeat steps (3) to (7) 4 times, with the pressure build-up pressure being 5± 0.5MPa, 10±0.5MPa, 12±1MPa, 15±1MPa; Step (9): Repeat steps (2) to (8) 6 times, with the temperature of the chamber being 50±2℃, 75±2℃, 100±2℃, 120±2℃, -20±2℃, -40±2℃ respectively; Step (10): Observe whether the solenoid valve is damaged or deformed; Step (11): Open the plug and the combination gasket; Step (12): The controller control coil is energized with a voltage of DC12±1V; Step (13): The hydraulic source builds up pressure to 15±1MPa; Step (14): Maintain a pressure of 15MPa for 30s; Step (15): Observe whether there is liquid flowing out of the buffer chamber.

[0015] The beneficial effects of this invention are as follows: the testing device of this invention requires a small hydraulic flow rate, enabling rapid and accurate testing of the performance and strength of the solenoid valve; the testing cost is low, the testing efficiency is high, and the required tooling space is small; the testing device can test the solenoid valve body alone, avoiding the need for other corresponding structures and components in the assembly during traditional assembly testing, thus reducing manufacturing costs; individual testing allows for a more comprehensive assessment of the lifespan of the steel balls inside the solenoid valve, with a short testing time; the testing method of this invention simulates actual vehicle usage conditions, performing simulation tests in multiple different pressure ranges based on the different pressure levels when lightly or heavily pressing the pedal, which is closer to reality and has higher testing accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Appendix Figure 1 This is a state diagram of the present invention, showing the state in which the solenoid valve under test is installed in the test fixture for testing;

[0018] Appendix Figure 2This is a cross-sectional view of the testing device of the present invention;

[0019] Appendix Figure 3 This describes the relationship between time and pressure in conventional high and low temperature impact strength testing.

[0020] Appendix Figure 4 The relationship between time and pressure in pulsed high and low temperature impact strength testing;

[0021] Appendix Figure 5 It has a screw-type structure;

[0022] Appendix Figure 6 The structure of the solenoid valve under test;

[0023] Appendix Figure 7 for Figure 1 Enlarged view of point A in the middle;

[0024] Appendix Figure 8 for Figure 2 Enlarged view of section B in the middle.

[0025] Figure label:

[0026] 1 Test fixture; 2 Controller; 3 Hydraulic source; 4 Solenoid valve; 41 Sealing boss; 42 Steel ball; 11 Base; 12 Pressure screw; 13 Coil; 131 Coil frame; 14 Sealing ring; 141 Ring groove; 15 Plug; 111 Hydraulic source connecting cavity; 112 Mounting cavity; 113 Buffer cavity; Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The present invention will now be further described with reference to the accompanying drawings.

[0029] Combined with appendix Figures 1-8 The present invention provides the following technical solution:

[0030] Reference Appendix Figure 1 , attached Figure 1This is a preferred embodiment of the testing device described in this invention. Specifically, the solenoid valve testing device of this invention is mainly used to test the strength of hydraulic ABS solenoid valves. It includes a testing fixture 1, a controller 2, and a hydraulic source 3. The testing fixture 1 includes a base 11, a pressure screw 12, a coil 13, a sealing ring 14, and a plug 15. The base 11 is provided with a hydraulic source connecting cavity 111, a mounting cavity 112, and a buffer cavity 113. The hydraulic source connecting cavity 111 is connected to the hydraulic source 3. The buffer cavity 113 and the hydraulic source connecting cavity 111 are located on both sides of the mounting cavity 112 and are both connected to the mounting cavity 112. The pressure screw 12 is sealed to the side wall of the mounting cavity 112 of the base 11. The plug 15 is sealed and installed on the other side of the buffer cavity 113. In this embodiment, the pressure screw 12 is provided with an external thread on the part corresponding to the base, and the inner wall of the mounting cavity 112 is provided with an internal thread. The pressure screw 12 is threaded to the base 11. The coil 13 is placed inside the pressure screw 12 and has a clearance fit with the pressure screw 12. The sealing ring 14 is placed between the pressure screw 12 and the base 11 and is pressed onto the base 11 by the pressure screw 12. The coil 13 is supported on the coil frame 131, and the controller 2 is mounted on the coil frame 131. Specifically, the sealing ring 14 is fitted around the outer circumference of the solenoid valve under test and is pressed tightly by the pressure screw 12. The sealing ring 14 presses and positions the solenoid valve under test, and the controller 2 is electrically connected to the coil 13 to control the on and off states of the coil 13.

[0031] Specifically, a groove is formed at the bottom of the pressure screw 12, and the sealing ring 14 is pressed between the groove and the base 11. When the sealing ring 14 is squeezed by the pressure screw and the solenoid valve 4, an annular groove 141 is formed from the inner ring at the bottom of the sealing ring 14. This annular groove 141 cooperates with the sealing boss 41 on the outer periphery of the solenoid valve. That is to say, the annular groove 141 can seal and limit the solenoid valve under test. An O-ring is also installed in the mounting cavity 112 corresponding to the bottom position of the solenoid valve to seal the connection between the solenoid valve and the base 11. The material of the O-ring is EPDM.

[0032] Specifically, the pressing screw 12 is also provided with a flat portion 121, which is formed by removing a portion of the outer circumference of the pressing screw 12, as shown in the attached figure. Figure 5 As shown, this setting facilitates wrench clamping and tightening.

[0033] The sealing ring is 2mm thick and made of copper. High-pressure sealing is achieved through the compression deformation of copper. The top of the pressure screw has an open structure, which facilitates heat dissipation during coil operation. Specifically, the open structure means that the upper part of the pressure screw does not have a cover plate; after the coil is inserted, it is open to the atmosphere, which helps dissipate heat from the coil into the air.

[0034] Appendix Figure 1This diagram shows the testing device of the present invention in use. The solenoid valve to be tested has been installed into the mounting cavity. Figure 2 The diagram shown is of the test apparatus of the present invention without the solenoid valve installed. (See attached diagram.) Figure 7 , 8 As can be seen from the enlarged image, the bottom of the sealing ring is initially flat, but... Figure 7 The enlarged image shows that a groove is formed at the bottom of the sealing ring, which cooperates with the protruding ring on the outer periphery of the solenoid valve. In fact, the groove is formed by the elastic deformation of the sealing ring due to the compression of the sealing ring by the screw, which in turn compresses the outer periphery of the solenoid valve.

[0035] Specifically, the volume of the buffer cavity is determined as follows:

[0036] .

[0037] In this formula, to simplify calculations, it is assumed that the pressure change in the cavity is uniform. In the formula, V is the buffer cavity volume, Ee is the effective bulk elastic modulus, including the equivalent elastic modulus of the oil itself and the walls of the closed cavity, Δq is the fluid flow rate into the closed cavity, t1 is the de-energization time of the normally open valve, t2 is the energization time of the normally open valve, Δp is the pressure change in the closed cavity, Cg is the flow coefficient, A0 is the area of ​​the normally open solenoid valve orifice, ρ is the brake fluid density, n is the number of steps, and d is the diameter of the normally open valve orifice. (Solenoid valve flow rate) In the formula, Cg is the flow coefficient, A0 is the cross-sectional area of ​​the throttle orifice, ρ is the brake fluid density, and Δp1 is the pressure difference before and after the throttle orifice. The brake fluid throughput for pulse intensity testing is Q = q * t1 * n, where q is the solenoid valve flow rate, t1 is the normally open valve de-energization time, and n is the number of times the normally open valve is de-energized. The dynamic closed cavity pressure formula is also provided. Ee is the effective bulk modulus, Δq is the difference between the flow rates of the liquid flowing into and out of the closed cavity at time t, and Δp is the change in pressure in the closed cavity at time t.

[0038] A key technical feature of the detection device described in this invention is the inclusion of a buffer chamber. If the buffer chamber volume is too small, the pressure will rise rapidly during the pulse high / low temperature impact strength test, resulting in fewer pressure steps and poor pulse strength test performance. Conversely, if the buffer chamber volume is too large, the pressure will rise slowly during the pulse high / low temperature impact strength test, leading to a longer overall test cycle. This is crucial for ensuring accurate and rapid testing when the solenoid valve is tested individually.

[0039] When using the testing device described in this invention, first place as follows: Figure 5 The hydraulic ABS solenoid valve shown is placed inside the coil and tightened by a sealing ring and a pressure screw. Figure 1This indicates the direction of liquid flow during testing. The testing device operates by building and releasing pressure using a hydraulic source, and the liquid depressurization and return flow also occurs through the hydraulic source. During testing, the plug seals the buffer chamber, creating a relatively sealed space between the hydraulic source connecting chamber, the mounting chamber, and the buffer chamber. Testing is then conducted by continuously building and releasing pressure within this sealed space using the hydraulic source.

[0040] The present invention also provides a method for testing the strength of a hydraulic ABS solenoid valve, wherein the test method is performed using the above-mentioned test device.

[0041] The test method is an ultimate pressure resistance test, which includes the following steps:

[0042] Step (1): Place the normally open solenoid valve to be tested into the pressure screw, press it with the sealing ring, and lock it with the pressure screw; Step (2): Build up the hydraulic pressure to 25~35±1MPa; Step (3): Maintain the hydraulic pressure at 25~35MPa for 30s; Step (4): Depressurize the hydraulic pressure; Step (5): Observe whether the solenoid valve is damaged or deformed.

[0043] In practice, the ultimate pressure resistance test can also be conducted in the following manner:

[0044] Step (1): Place the normally open solenoid valve under test below the sealing ring and tighten it with the pressure screw; Step (2): Build up the hydraulic pressure to 25±1MPa; Step (3): Maintain the hydraulic pressure at 25MPa for 30s; Step (4): Depressurize the hydraulic pressure; Step (5): Observe whether the solenoid valve is damaged or deformed.

[0045] Or you can do it in the following way:

[0046] Step (1): Place the normally open solenoid valve under test below the sealing ring and tighten it with the pressure screw; Step (2): Build up the hydraulic pressure to 35±1MPa; Step (3): Maintain the hydraulic pressure at 35MPa for 30s; Step (4): Depressurize the hydraulic pressure; Step (5): Observe whether the solenoid valve is damaged or deformed.

[0047] The test method is a conventional high and low temperature impact strength test, which includes the following steps:

[0048] Step (1): Place the normally open solenoid valve to be tested into the pressure screw, tighten it with the sealing ring, and lock it with the pressure screw; Step (2): Place the test device in a 20±2℃ temperature chamber, and pressurize it to 10MPa with the hydraulic power source at a frequency of 0.2778±0.0278Hz and then depressurize it; Step (3): Pressurize it 50,000 to 55,000 times; Step (4): Place the test device in a 50±2℃ temperature chamber, and pressurize it to 10MPa with the hydraulic power source at a frequency of 0.2778±0.0278Hz and then depressurize it; Step ( 5): Pressure build-up 50,000 to 55,000 times; Step (6): Place the testing device in a 75±2℃ temperature chamber, and use a hydraulic source to build up pressure to 10MPa and depressurize at a frequency of 0.2778±0.0278Hz; Step (7): Pressure build-up 50,000 to 55,000 times; Step (8): Place the testing device in a 100±2℃ temperature chamber, and use a hydraulic source to build up pressure to 10MPa and depressurize at a frequency of 0.2778±0.0278Hz; Step (9): Pressure build-up 60,000 to 65,000 times; Step (10): Place the testing device in a 75 ...10): Pressure build-up 60,000 to 65,000 times; Step (11): Place the testing device in a 75±2℃ temperature chamber, and use a hydraulic source to build up pressure to 10MPa and depressurize at a frequency of 0.2778±0.0278Hz; Step (12): Pressure build-up 60,000 to 65,000 times; Step (13): Place the testing device in a 75±2℃ temperature chamber, and use a hydraulic source to build up pressure to 10MPa and depressurize at a frequency of 0.2778±0.0278Hz; Step The test apparatus was placed in a 120±2℃ temperature chamber, and the hydraulic power source was pressurized to 10MPa and depressurized at a frequency of 0.2778±0.0278Hz; Step (11): pressurization 55,000 to 60,000 times; Step (12): the test apparatus was placed in a -20±2℃ freezing chamber, and the hydraulic power source was pressurized to 10MPa and depressurized at a frequency of 0.1667±0.0167Hz; Step (13): pressurization 25,000 to 30,000 times; Step (14): the test apparatus was placed in a -40±2℃ freezing chamber, and the hydraulic power source was pressurized to 10MPa and depressurized at a frequency of 0.1667±0.0167Hz; The source builds up pressure to 10MPa and releases pressure at a frequency of 0.1667±0.0167Hz; Step (15): Build up pressure 20,000 times; Step (16): Observe whether the solenoid valve is damaged or deformed; Step (17): Open the plug and the combination gasket; Step (18): The controller control coil is energized with a voltage of DC12±1V; Step (19): The hydraulic source builds up pressure to 15±1MPa; Step (20): Maintain the pressure of 15MPa for 30s; Step (21): Observe whether there is liquid flowing out of the buffer chamber.

[0049] The test method is a pulse high and low temperature impact strength test, which includes the following steps:

[0050] Step (1): Place the normally open solenoid valve under test below the sealing ring and tighten it with the pressure screw; Step (2): Place the test apparatus in a 20±2℃ temperature chamber; Step (3): energize the controller coil with a voltage of DC12±1V; Step (4): build up the hydraulic pressure to 2.5±0.MPa; Step (5): energize the controller coil with pulses, with an energization time of 8ms and an on time of 8ms, and energize 5 times; Step (6): energize the controller coil with pulses, and depressurize the hydraulic pressure; Step (7): Repeat steps (3) to (6) for a total of 800 times; Step (8): Repeat steps (3) to (7) 4 times, with the pressure build-up pressure being 5±0.MPa in sequence. 0.5MPa, 10±0.5MPa, 12±1MPa, 15±1MPa; Step (9): Repeat steps (2) to (8) 6 times, with the temperature of the chamber being 50±2℃, 75±2℃, 100±2℃, 120±2℃, -20±2℃, -40±2℃ respectively; Step (10): Observe whether the solenoid valve is damaged or deformed; Step (11): Open the plug and the combination gasket; Step (12): The controller control coil is energized with a voltage of DC12±1V; Step (13): The hydraulic source builds up pressure to 15±1MPa; Step (14): Maintain a pressure of 15MPa for 30s; Step (15): Observe whether there is liquid flowing out of the buffer chamber.

[0051] The strength testing method described in this invention not only detects the destructive strength of the solenoid valve, but also assesses the strength of the solenoid valve under different temperatures and pressures. The buffer chamber set on the base facilitates the rise of hydraulic pressure pulses and impacts the solenoid valve, making the strength test faster and more accurate. The testing method of this invention simulates the wheel cylinder load of a real vehicle, forming a brake fluid impact backflow, which is closer to the actual operating conditions.

[0052] The testing device described in this invention changes the existing method of testing ABS assemblies by testing the solenoid valve separately. A corresponding testing device has been developed and designed. This device requires a small hydraulic flow rate, enabling rapid and accurate testing of the solenoid valve's performance and strength. It offers low testing costs, high testing efficiency, and requires minimal tooling space. The device can test the solenoid valve body alone, avoiding the need for other structures and components in the assembly during traditional assembly testing, thus reducing manufacturing costs. The pulse high and low temperature impact strength test provides a more comprehensive assessment of the lifespan of the steel ball 42 inside the solenoid valve 4. Utilizing the pulsating impact of brake fluid, the steel ball continuously strikes the solenoid valve, mirroring the actual ABS adjustment conditions in a real vehicle. This allows for a more comprehensive assessment of the lifespan of the steel ball 42 inside the solenoid valve 4, with a short testing time. The testing method of this invention simulates actual vehicle usage, performing simulation tests in multiple pressure ranges based on the pressure levels of light and heavy pedaling, making it more realistic and improving testing accuracy.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A strength testing device for a hydraulic ABS solenoid valve, characterized in that: The device includes a test fixture, a controller, and a hydraulic power source. The test fixture includes a base, a pressure screw, a coil, a sealing ring, and a plug. The base has a hydraulic power source connecting cavity, a mounting cavity, and a buffer cavity. The hydraulic power source connecting cavity is connected to the hydraulic power source. The buffer cavity and the hydraulic power source connecting cavity are located on opposite sides of the mounting cavity and are both connected to the mounting cavity. The plug is sealed and installed on the other side of the buffer cavity. The pressure screw is sealed to the side wall of the mounting cavity of the base. The coil is placed inside the pressure screw and is fitted with a clearance fit with the pressure screw. The sealing ring is placed between the pressure screw and the base and is pressed onto the base by the pressure screw. The sealing ring presses and positions the solenoid valve under test. The controller is electrically connected to the coil to control the coil's on / off state. In the formula, V is the volume of the buffer cavity, Ee is the effective bulk elastic modulus, including the equivalent elastic modulus of the oil itself and the wall of the closed cavity, Δq is the flow rate of the liquid flowing into the closed cavity, t1 is the de-energization time of the normally open valve, t2 is the energization time of the normally open valve, Δp is the pressure change of the closed cavity, Cg is the flow coefficient, A0 is the area of ​​the throttle orifice of the normally open solenoid valve, ρ is the density of the brake fluid, n is the number of steps, d is the diameter of the throttle orifice of the normally open valve, and Δp1 is the pressure difference before and after the throttle orifice.

2. The hydraulic ABS solenoid valve strength testing device according to claim 1, characterized in that: The bottom of the screw has a groove, and the sealing ring is pressed into the groove. When the sealing ring is squeezed by the screw and the solenoid valve, a ring groove is formed from the inner ring at the bottom of the sealing ring. This ring groove cooperates with the sealing boss on the outer periphery of the solenoid valve.

3. The hydraulic ABS solenoid valve strength testing device according to claim 1, characterized in that: The pressure screw is also provided with a flat position.

4. A method for testing the strength of a hydraulic ABS solenoid valve, characterized in that: The test method is performed using the test device described in any one of claims 1 to 3. The test method is an ultimate pressure resistance test, which includes the following steps: Step (1): Place the normally open solenoid valve to be tested into the pressure screw, press it with the sealing ring, and lock it with the pressure screw; Step (2): Build up the hydraulic pressure to 25~35±1MPa; Step (3): Maintain the hydraulic pressure of 25~35MPa for 30s; Step (4): Depressurize the hydraulic pressure; Step (5): Observe whether the solenoid valve is damaged or deformed.

5. A method for testing the strength of a hydraulic ABS solenoid valve, characterized in that: The test method is performed using the test device described in any one of claims 1 to 3. The test method is a conventional high and low temperature impact strength test, comprising the following steps: Step (1): The normally open solenoid valve to be tested is placed in the pressure screw, pressed with the sealing ring, and locked with the pressure screw; Step (2): The test device is placed in a 20±2℃ temperature chamber, and the hydraulic source is pressurized to 10MPa at a frequency of 0.2778±0.0278Hz and then depressurized; Step (3): Pressurization is performed 50,000 to 55,000 times; Step (4): The test device is placed in a 50±2℃ temperature chamber. In the process, the hydraulic power source is pressurized to 10MPa and depressurized at a frequency of 0.2778±0.0278Hz; Step (5): Pressurization 50,000 to 55,000 times; Step (6): The test device is placed in a 75±2℃ temperature chamber, and the hydraulic power source is pressurized to 10MPa and depressurized at a frequency of 0.2778±0.0278Hz; Step (7): Pressurization 50,000 to 55,000 times; Step (8): The test device is placed in a 100±2℃ temperature chamber, and the hydraulic power source is pressurized to 10MPa and depressurized at a frequency of 0.2778±0.0278Hz. Step (9): Pressure build-up 60,000 to 65,000 times; Step (10): Place the testing apparatus in a 120±2℃ temperature chamber, and use a hydraulic power source to build up pressure to 10MPa and release pressure at a frequency of 0.2778±0.0278Hz; Step (11): Pressure build-up 55,000 to 60,000 times; Step (12): Place the testing apparatus in a -20±2℃ freezing chamber, and use a hydraulic power source to build up pressure to 10MPa and release pressure at a frequency of 0.1667±0.0167Hz; Step (13): Pressure build-up 25,000 to 30,000 times; Step (14): Place the testing apparatus... Placed in a -40±2℃ freezer, the hydraulic power source pressurizes to 10MPa and depressurizes at a frequency of 0.1667±0.0167Hz; Step (15): Pressurize 20,000 times; Step (16): Observe whether the solenoid valve is damaged or deformed; Step (17): Open the plug and the combination gasket; Step (18): The controller control coil is energized with a voltage of DC12±1V; Step (19): The hydraulic power source pressurizes to 15±1MPa; Step (20): Maintain the pressure of 15MPa for 30s; Step (21): Observe whether there is liquid flowing out of the buffer chamber.

6. A method for testing the strength of a hydraulic ABS solenoid valve, characterized in that: The test method is performed using the test device described in any one of claims 1 to 3. The test method is a pulse high and low temperature impact strength test, which includes the following steps: Step (1): Place the normally open solenoid valve to be tested below the sealing ring and tighten it with a pressure screw; Step (2): Place the test device in a 20±2℃ temperature chamber; Step (3): The controller controls the coil to be energized with a voltage of DC12±1V; Step (4): The hydraulic source is pressurized to 2.5±0.5MPa; Step (5): The controller controls the coil to be pulsed on and off, with an off time of 8ms and an on time of 8ms, and the number of off times is 5; Step (6): The controller controls the coil to be pulsed on and off, and the hydraulic source is depressurized; Step (7): Repeat steps (3) to (6). Total 800 times; Step (8): Repeat steps (3) to (7) 4 times, with the pressure build-up pressures being 5±0.5MPa, 10±0.5MPa, 12±1MPa, and 15±1MPa respectively; Step (9): Repeat steps (2) to (8) 6 times, with the chamber temperatures being 50±2℃, 75±2℃, 100±2℃, 120±2℃, -20±2℃, and -40±2℃ respectively; Step (10): Observe whether the solenoid valve is damaged or deformed; Step (11): Open the plug and the combination gasket; Step (12): The controller control coil is energized with a voltage of DC12±1V; Step (13): The hydraulic source builds up pressure to 15±1MPa; Step (14): Maintain a pressure of 15MPa for 30s; Step (15): Observe whether there is liquid flowing out of the buffer chamber.

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