Endurance test device for pneumatic PWM electromagnetic valve assembly of clutch

Abstract

The utility model discloses an endurance test device for a pneumatic PWM electromagnetic valve assembly of a clutch. The endurance test device comprises a PWM output module and a two-way time-sharing switch module which are respectively connected with a power supply module, and a PWM electromagnetic valve assembly to be tested which is connected with the PWM output module through the two-way time-sharing switch module, the PWM electromagnetic valve assembly comprises a plurality of air inlet electromagnetic valves and exhaust electromagnetic valves which are communicated with each other, a clutch actuator simulation fusion cavity used for simulating an air storage space in a clutch actuator is arranged on a communication pipeline of the air inlet electromagnetic valves and the exhaust electromagnetic valves, and the air inlet electromagnetic valves are communicated with an air pump used for simulating the pressure of an air source of the whole vehicle; the two-way time-sharing switch module is used for controlling on-off of a circuit where the air inlet electromagnetic valve and the exhaust electromagnetic valve are located. According to the utility model, real application conditions can be simulated, an endurance test is carried out on the to-be-tested solenoid valve assembly according to a clutch separation and combination action time sequence, and the temperature of the valve body can be monitored in real time through the temperature control device, so that the test is carried out within a set temperature range.

Description

Technical Field

[0001] The utility model belongs to the technical field of solenoid valve testing, and particularly relates to a durability test device for a clutch pneumatic PWM solenoid valve assembly. Background Art

[0002] The PWM solenoid valve is a product with a very wide range of applications, and the working life of the PWM solenoid valve is a crucial parameter. In the research and development of the PWM solenoid valve, the durability test of the PWM solenoid valve is a very critical step. The durability test needs to simulate the actual working conditions of the solenoid valve to be tested. At present, there is no clear test method for the clutch pneumatic PWM solenoid valve assembly to verify the pneumatic solenoid valve assembly product. The conventional solenoid valve detection methods generally do not have temperature monitoring and over-temperature protection on-off control, which is easy to damage the solenoid valve to be tested. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides a durability test device for a clutch pneumatic PWM solenoid valve assembly, which is mainly used for the durability life test of the clutch pneumatic PWM solenoid valve assembly, and detects whether the built-in solenoid valve of the assembly meets the design life cycle index when applied to clutch control.

[0004] The technical solution provided by the utility model is as follows:

[0005] A durability test device for a clutch pneumatic PWM solenoid valve assembly includes a PWM output module, a dual-channel time-sharing switch module respectively connected to a power supply module, and a PWM solenoid valve assembly to be tested connected to the PWM output module through the dual-channel time-sharing switch module; the PWM solenoid valve assembly includes a plurality of intake solenoid valves and exhaust solenoid valves that are interconnected, and a clutch actuator simulation cavity for simulating the internal air storage space of the clutch actuator is arranged on the connecting pipeline between the intake solenoid valve and the exhaust solenoid valve, and the intake solenoid valve is communicated with an air pump for simulating the vehicle air source pressure; the PWM output module is used to output a PWM pulse excitation signal for driving the opening and closing of the solenoid valve to be tested to the PWM solenoid valve assembly to be tested, and the dual-channel time-sharing switch module is used to control the on-off of the circuits where the intake solenoid valve and the exhaust solenoid valve are located.

[0006] Further, it also includes a temperature control switch module arranged between the PWM output module and the PWM solenoid valve assembly to be tested, and the temperature control switch module is connected to a thermocouple sensor arranged on the surface of the intake solenoid valve or the exhaust solenoid valve.

[0007] Further, it also includes a first PWM counting module for detecting and accumulating the number of PWM pulse excitations experienced during the test of the intake solenoid valve.

[0008] Further, it further includes a second PWM counting module for detecting and accumulating the number of PWM pulse excitations experienced during the exhaust solenoid valve test.

[0009] Further, it further includes an extended terminal module for extending the wiring terminals of the PWM solenoid valve assembly to be tested.

[0010] Further, the PWM output module is further configured with an LED digital tube, an adjustment knob, a start / stop button, and a mode selection button; the mode selection button and the adjustment button are used to set the duty cycle and operating frequency of the pulse excitation, and the LED digital tube is used to display the set duty cycle and operating frequency in real time.

[0011] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0012] It can simulate the real application working conditions, and according to the action sequence of the clutch separation and engagement, make the assembly to be tested realize the intake solenoid valve ventilation during separation and the exhaust solenoid valve exhaust during engagement;

[0013] By using the adjustable PWM output module, the frequency and duty cycle of the test PWM pulse signal can be adjusted as needed, making the test method highly versatile and suitable for the test requirements of different frequencies and duty cycles;

[0014] The temperature control device monitors the temperature of the valve body to be tested in real time, can understand the temperature rise of the solenoid valve at any time, and the temperature control device can achieve over-temperature open circuit protection and automatic circuit connection after cooling, enabling the experiment to be carried out within the set temperature range;

[0015] A PWM counting module is also added, which can be used to record the total number of solenoid valve actions in real time. Description of the Drawings

[0016] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model.

[0017] Figure 1 is a schematic diagram of the test device provided by an embodiment of the present utility model;

[0018] Figure 2 is a schematic diagram of the solenoid valve state switching provided by an embodiment of the present utility model.

[0019] Among them, each reference numeral represents:

[0020] 1-DC power supply, 2-PWM output module, 3-temperature control switch module, 4-dual-way time-sharing switch module, 5-first PWM counting module, 6-second PWM counting module, 7-extension terminal module, 8-air pump, 9-PWM solenoid valve assembly, 10-thermocouple sensor, 11-clutch actuator melting cavity, 12-intake solenoid valve, 13-exhaust solenoid valve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] like Figure 1 As shown, this embodiment provides a clutch pneumatic PWM solenoid valve assembly durability test device, which mainly includes the following modules:

[0023] 24V DC power supply 1: as the system main power supply, it provides 24V DC voltage to each test function module. In this embodiment, the rated working voltage of the solenoid valve assembly to be tested is 24V, so 24V is used as an example. The device described in this embodiment is also applicable to pulse PWM solenoid valves with a rated working voltage of 5V or 12V, but it is necessary to adjust the DC power supply voltage and select a suitable working module to match the electrical parameters of the solenoid valve to be tested.

[0024] PWM output module 2: Outputs PWM pulse excitation signal to the solenoid valve assembly to be tested to drive the solenoid valve to open and close. This module is equipped with LED digital tube, adjustment knob, start / stop button and mode selection button. The duty cycle and operating frequency of the pulse excitation can be adjusted by the knob after being selected by the mode selection button, and the LED digital tube displays the adjusted duty cycle and operating frequency in real time.

[0025] Temperature control switch module 3: connected to K-type thermocouple sensor 10, used to detect the surface temperature of the solenoid valve in real time. The temperature control switch module can also set the temperature working range [T1, T2]. When the detected temperature exceeds T2, the temperature control switch cuts off the main power supply and the test is suspended; when the detected temperature drops below T1, the temperature control switch connects the main power supply and the test resumes.

[0026] Dual-way time-sharing switch module 4: Built-in dual-way time-sharing switch, which can set the on time and off time of a single-way switch separately. Equipped with mode selection and time setting buttons.

[0027] The first PWM counting module 5: detects and accumulates the number of PWM pulse excitations experienced during the testing of the two intake solenoid valves, and displays it through the LED digital tube.

[0028] The second PWM counting module 6: detects and accumulates the number of PWM pulse excitations experienced during the testing of the two exhaust solenoid valves, and displays it through the LED digital tube.

[0029] The PWM solenoid valve assembly expansion terminal module 7: used to expand all the wiring terminals of the 4-way solenoid valves in the assembly.

[0030] The air pump 8: simulates the vehicle air source pressure during the test.

[0031] The PWM solenoid valve assembly 9: the sample to be tested, Figure 1 schematically shows a PWM solenoid valve assembly composed of 2 intake solenoid valves 12 and 2 exhaust solenoid valves 13.

[0032] The thermocouple sensor 10: is pasted and fixed at the specified part of the solenoid valve to be tested (usually the coil position), and is connected to the temperature control switch module at the same time to detect the real-time temperature.

[0033] The clutch actuator simulation melting cavity 11: simulates the internal gas storage space of the clutch actuator.

[0034] Test cable: Considering the working characteristics of the PWM pulse solenoid valve, when the solenoid valve is completely closed, the magnitude of the current flowing through the solenoid valve coil is determined by its rated working current and coil internal resistance. Especially when testing multiple solenoid valves in parallel, the trunk current is the sum of the branch currents. The wire diameter selection of the test cable needs to consider the ability to withstand the maximum theoretical current during the test.

[0035] When the device provided in this embodiment is in use, it mainly includes the following steps:

[0036] Press Figure 1 Connect each test module and the test sample with the test cable according to the shown system block diagram.

[0037] Paste the thermocouple sensor 10 on the surface of the coil housing of the "intake valve 1", and connect it to the corresponding electrical interface of the temperature control switch module.

[0038] Set the excitation signal parameters of the PWM output module as follows: duty cycle - 50%; frequency - 50Hz. Set the temperature working range [T1, T2] of the temperature control switch module to [30, 70], which means that the upper working limit temperature of the solenoid valve coil surface during the test is 70 degrees, and the lower working limit temperature is 30 degrees. When the upper working limit temperature is reached, the test will be suspended, and the solenoid valve will enter the cooling state until the coil surface temperature drops below the lower working limit temperature of 30 degrees, and the test will resume. Therefore, the effective working temperature range is between 30 degrees and 70 degrees. The working state of the solenoid valve is determined by this temperature range. As inFigure 2 Switch between the two states shown.

[0039] Set the dual-channel time-sharing switch module as follows:

[0040] Step a: Connect S1 for 0.5 seconds and disconnect S2;

[0041] Step b: Disconnect both S1 and S2 and keep for 0.5 seconds;

[0042] Step c: Connect S2 for 0.5 seconds and disconnect S1;

[0043] Step d: Return to step a.

[0044] The function explanations of each step are as follows:

[0045] Step a: The working circuit of the intake solenoid valve in the solenoid valve assembly to be tested is connected for 0.5 seconds. Compressed air flows from the intake port to the outlet port and finally flows into the clutch actuator simulation cavity to establish a stable pressure, simulating the working state of the solenoid valve assembly when the clutch is disengaged;

[0046] Step b: After the pressure in the clutch actuator simulation cavity is established, both the intake and exhaust solenoid valve circuits are disconnected, and the pressure remains stable for 0.5 seconds, simulating the working state of the solenoid valve assembly when the clutch is kept disengaged;

[0047] Step c: The working circuit of the exhaust solenoid valve is connected for 0.5 seconds. Compressed air flows from the outlet port to the exhaust port and is finally discharged to the atmosphere. Simulating the working state of the solenoid valve assembly when the clutch is engaged;

[0048] Step d: Return to step a so that the solenoid valve assembly can cyclically charge and discharge the clutch actuator simulation cavity

[0049] The PWM counting module accumulates the number of PWM pulse excitations applied to the two groups of solenoid valves and displays them through the LED digital tube.

[0050] Through the above steps in this embodiment, it is possible to simulate the actual usage situation of the PWM solenoid valve assembly under the conditions of clutch disengagement for 0.5 seconds, disengagement hold for 0.5 seconds, and engagement for 0.5 seconds, and to assess the durability of the solenoid valve assembly through the cyclic function of the dual-channel time-sharing switch module.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; under the idea of the present utility model, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A clutch pneumatic PWM solenoid valve assembly durability test device, characterized in that: It includes a PWM output module and a two-way time-sharing switch module respectively connected to the power module, and a PWM solenoid valve assembly to be tested that is connected to the PWM output module through the two-way time-sharing switch module; the PWM solenoid valve assembly includes a plurality of intake solenoid valves and exhaust solenoid valves that are interconnected, and a clutch actuator simulation melting cavity for simulating the internal air storage space of the clutch actuator is provided on the connecting pipeline of the intake solenoid valve and the exhaust solenoid valve, and the intake solenoid valve is connected to an air pump for simulating the air source pressure of the whole vehicle; the PWM output module is used to output a PWM pulse excitation signal for driving the solenoid valve to open and close to the PWM solenoid valve assembly to be tested, and the two-way time-sharing switch module is used to control the on-off of the circuit where the intake solenoid valve and the exhaust solenoid valve are located.

2. A clutch pneumatic PWM solenoid valve assembly durability test device as claimed in claim 1, characterized in that: It also includes a temperature control switch module arranged between the PWM output module and the PWM solenoid valve assembly to be tested, and the temperature control switch module is connected to a thermocouple sensor arranged on the surface of the intake solenoid valve or the exhaust solenoid valve.

3. A clutch pneumatic PWM solenoid valve assembly durability test device as claimed in claim 1, characterized in that: The system also includes a first PWM counting module for detecting and accumulating the number of PWM pulse excitations experienced during the intake solenoid valve test.

4. A clutch pneumatic PWM solenoid valve assembly durability test device as claimed in claim 1, characterized in that: The invention also includes a second PWM counting module for detecting and accumulating the number of PWM pulse excitations experienced during the exhaust solenoid valve test.

5. A clutch pneumatic PWM solenoid valve assembly durability test device as claimed in claim 1, characterized in that: Also included is an expansion terminal module for expanding the wiring terminals of the PWM solenoid valve assembly to be tested.

6. A clutch pneumatic PWM solenoid valve assembly durability test device as claimed in claim 1, characterized in that: The PWM output module is also configured with an LED digital tube, an adjustment knob, a start / stop button and a mode selection button; the mode selection button and the adjustment button are used to set the duty cycle and operating frequency of the pulse excitation, and the LED digital tube is used to display the set duty cycle and operating frequency in real time.

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