A pressure switch electric load performance test circuit

Abstract

The utility model provides a kind of pressure switch electric load performance test circuit, belong to test circuit structure technical field, including electric load test main circuit, electric load control circuit, timing control circuit, solenoid valve control circuit, alarm monitoring circuit, counting circuit and with each circuit connection power supply circuit, compared with existing pressure switch electric load test circuit, need not repeatedly build, and can test multiple groups of sample simultaneously, greatly improve test efficiency, electric load test main circuit, solenoid valve control circuit, alarm circuit etc. are independently present, when certain one sample fails, it does not affect the continued test of other samples, circuit has alarm protection function simultaneously, when switch sample fails, test device will cut off the test circuit of failure sample, and alarm.

Description

Technical Field

[0001] This utility model belongs to the technical field of test circuit structure, specifically relating to a pressure switch electrical load performance test circuit. Background Technology

[0002] The pressure switch in the transmission assembly is a key component of the automatic transmission control system. It is mainly used to monitor the hydraulic system pressure, provide feedback on gear position and shift timing information, and ensure shift quality and system safety. Its performance is directly related to the vehicle's operational safety and driving experience. Therefore, a qualified, reliable, and stable pressure switch is of paramount importance to the transmission assembly.

[0003] The electrical load performance test of pressure switches is an essential and important part of their many test items. The traditional method of pressure switch testing involves setting up a temporary circuit for testing, and it can only be tested individually. This method has the following drawbacks: 1. The test circuit needs to be built repeatedly and can only be tested one by one, resulting in low testing efficiency.

[0004] 2. The test circuit lacks an alarm function, so it cannot detect switch failures in a timely manner.

[0005] 3. The wiring on site was messy and posed a safety hazard. Utility Model Content

[0006] The purpose of this utility model is to provide a pressure switch electrical load performance test circuit to overcome the technical problems of existing pressure switch electrical load performance test circuits, which require repeated construction, have low testing efficiency, and lack alarm functions.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A pressure switch electrical load performance test circuit includes an electrical load test main circuit, an electrical load control circuit, a timing control circuit, a solenoid valve control circuit, an alarm monitoring circuit, a counting circuit, and a power supply circuit connected to each circuit. The main circuit for electrical load testing is equipped with a solid-state relay, an ammeter, and a pressure switch. The main circuit for electrical load testing is connected to the electrical load control circuit via a solid-state relay, the main circuit for electrical load testing is connected to the alarm monitoring circuit via an ammeter, and the main circuit for electrical load testing is connected to the solenoid valve control circuit via a pressure switch. Both the timing control circuit and the alarm monitoring circuit are equipped with intermediate relays. The timing control circuit and the alarm monitoring circuit are respectively connected to the solenoid valve control circuit through intermediate relays, and the alarm monitoring circuit is connected to the electrical load control circuit through intermediate relays. The counting circuit is connected to the intermediate relay of the timing control circuit.

[0008] Furthermore, the power supply circuit includes a first DC power supply circuit and a second DC power supply circuit. The first DC power supply circuit is connected to the main circuit for electrical load testing, and the second DC power supply circuit is connected to the electrical load control circuit, the timing control circuit, the solenoid valve control circuit, and the alarm monitoring circuit.

[0009] Furthermore, air switches are respectively installed in the first DC power supply circuit and the second DC power supply circuit.

[0010] Furthermore, the power supply circuit also includes a cooling fan power supply circuit, which is equipped with a cooling fan and a temperature controller.

[0011] Furthermore, an air switch is also provided in the power supply circuit of the cooling fan.

[0012] Furthermore, the normally open contact of the intermediate relay in the electrical load control circuit is connected to the alarm monitoring circuit. The alarm monitoring circuit includes a fault control circuit and a fault indication circuit. The fault control circuit includes a normally closed contact of an ammeter and an intermediate relay coil, and the fault indication circuit includes a normally closed contact of an intermediate relay and an alarm indicator light.

[0013] Furthermore, the timing control loop is equipped with a meter control controller, and the input terminal of the meter control controller is connected to an alarm feedback loop and a timing output reset loop. Furthermore, a solenoid valve reset button is provided in the timed output reset circuit.

[0014] Furthermore, the ammeter employs an AC digital display current controller.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a pressure switch electrical load performance testing circuit, which has the following advantages compared with existing testing methods: 1. The test circuit is standardized and fixed, eliminating the need for repeated setup and allowing simultaneous testing of multiple samples, which greatly improves testing efficiency.

[0016] 2. The test circuit is equipped with current monitoring, which can display the test circuit current in real time. The ammeter has also been calibrated, providing more reliable data support for the test.

[0017] 3. The test circuit has an alarm protection function. When the switch sample fails, the test circuit will cut off the test circuit of the faulty sample and sound an alarm. The test personnel can discover the fault in time and make test records and handle the fault.

[0018] 4. The timing output of the controller in the test circuit is more accurate and better meets the test requirements than the timing output of the original time delay relay (adjustable knob).

[0019] 5. The main circuit for electrical load testing, the solenoid valve control circuit, and the alarm circuit all exist independently. When one sample fails, it will not affect the continued testing of other samples. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a pressure switch electrical load performance test circuit according to an embodiment of this utility model; Figure 2 This is a diagram of the power supply circuit structure; Figure 3 This is the main circuit diagram for electrical load testing; Figure 4 It is a control loop diagram; Figure 5 This is the alarm monitoring loop diagram; Figure 6 This is a diagram of a solenoid valve control circuit. Figure 7 It is a counting loop diagram; Figure 8 This is a connection diagram of the meter control controller module; Figure 9 This is a diagram of an ammeter module. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 should fall within the protection scope of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In one embodiment of this utility model, such as Figure 1As shown, a pressure switch electrical load performance test circuit is provided, including an electrical load test main circuit. A solid-state relay, an ammeter, and a pressure switch are provided in the electrical load test main circuit. The electrical load test main circuit is connected to the electrical load control circuit through the solid-state relay, connected to the alarm monitoring circuit through the ammeter, and connected to the solenoid valve control circuit through the pressure switch. Intermediate relays are provided in both the timing control circuit and the alarm monitoring circuit. The timing control circuit and the alarm monitoring circuit are respectively connected to the solenoid valve control circuit through the intermediate relays. The alarm monitoring circuit is connected to the electrical load control circuit through the intermediate relays. The counting circuit is connected to the intermediate relay of the timing control circuit. The main circuit for electrical load testing, the electrical load control circuit, the timing control circuit, the solenoid valve control circuit, the alarm monitoring circuit, and the counting circuit are all connected to the power supply circuit.

[0025] Specifically, such as Figure 2 As shown, the power supply circuit includes a first DC power supply circuit, a second DC power supply circuit, and a cooling fan power supply circuit. The first DC power supply circuit is connected to the main circuit for electrical load testing. The power supply in the first DC power supply circuit is 24V, 100A DC power, and an air switch QF3 is installed in the circuit. The second DC power supply circuit is connected to the electrical load control circuit, the timing control circuit, the solenoid valve control circuit, and the alarm monitoring circuit. The power supply in the second DC power supply circuit is 24V, 10A DC power, and an air switch QF4 is installed in the circuit. The cooling fan power supply circuit is equipped with two cooling fans FJ1 and FJ2, a temperature controller WK, and an air switch QF2.

[0026] In one optional embodiment, the electrical load test main circuit is provided with three circuits, each with the same structure, including an air switch, an ammeter, a solid-state relay, a resistor, and a pressure switch. Two cooling fans, FJ1 and FJ2, are used to cool the resistors in the electrical load test main circuit.

[0027] like Figure 3 As shown, specifically, the first electrical load test main circuit is equipped with an air switch QF5, a first ammeter PA1, a normally open contact of a solid-state relay K01, a resistor R1, and a pressure switch YLKG1; the second electrical load test main circuit is equipped with an air switch QF6, a second ammeter PA2, a normally open contact of a solid-state relay K02, a resistor R2, and a pressure switch YLKG3; and the first electrical load test main circuit is equipped with an air switch QF7, a third ammeter PA3, a normally open contact of a solid-state relay K03, a resistor R3, and a pressure switch YLKG3. Each electrical load test main circuit corresponds to an electrical load control circuit. The first electrical load test main circuit corresponds to the first electrical load control circuit, which includes the normally open contact of the seventh intermediate relay K07 and the coil of the first solid-state relay K01. The second electrical load test main circuit corresponds to the second electrical load control circuit, which includes the normally open contact of the eighth intermediate relay K08 and the coil of the second solid-state relay K02. The third electrical load test main circuit corresponds to the third electrical load control circuit, which includes the normally open contact of the ninth intermediate relay K09 and the coil of the third solid-state relay K03.

[0028] like Figure 6 As shown, the solenoid valve control circuit drives the pressure switch through the solenoid valve. The first solenoid valve control circuit corresponding to the first electrical load test main circuit includes the normally open contact of the fourth intermediate relay K04, the normally open contact of the seventh intermediate relay K07, and the first solenoid valve YV1; the second solenoid valve control circuit corresponding to the second electrical load test main circuit includes the normally open contact of the fifth intermediate relay K05, the normally open contact of the eighth intermediate relay K08, and the second solenoid valve YV2; the third solenoid valve control circuit corresponding to the third electrical load test main circuit includes the normally open contact of the sixth intermediate relay K06, the normally open contact of the ninth intermediate relay K09, and the third solenoid valve YV3.

[0029] There are three timing control circuits corresponding to the solenoid valve control circuit, such as... Figure 4 As shown, the first timing control loop includes a meter controller and the coil of the fourth intermediate relay K04 connected to the output terminal of the meter controller; the second timing control loop includes a meter controller and the coil of the fifth intermediate relay K05 connected to the output terminal of the meter controller; the third timing control loop includes a meter controller and the coil of the sixth intermediate relay K06 connected to the output terminal of the meter controller; in addition, the three timing control loops share the same meter controller.

[0030] like Figure 5 As shown, the alarm monitoring circuit includes a fault control circuit and a fault indication circuit. The first fault control circuit corresponding to the first electrical load test main circuit includes the normally closed contact of the first ammeter PA1 and the coil of the seventh intermediate relay K07. The first fault indication circuit includes the normally closed contact of the seventh intermediate relay K07 and the first indicator light H1. The second fault control circuit corresponding to the second electrical load test main circuit includes the normally closed contact of the second ammeter PA2 and the coil of the eighth intermediate relay K08. The second fault indication circuit includes the normally closed contact of the eighth intermediate relay K08 and the second indicator light H2. The third fault control circuit corresponding to the third electrical load test main circuit includes the normally closed contact of the third ammeter PA3 and the coil of the ninth intermediate relay K09. The third fault indication circuit includes the normally closed contact of the ninth intermediate relay K09 and the third indicator light H3.

[0031] like Figure 7 As shown, the first counter JSQ1 in the first counting circuit is connected to the normally open contact of the fourth intermediate relay K04; the first counter JSQ2 in the second counting circuit is connected to the normally open contact of the fifth intermediate relay K05; and the third counter JSQ3 in the third counting circuit is connected to the normally open contact of the sixth intermediate relay K06.

[0032] like Figure 8 As shown, the input terminal of the timing control circuit is connected to an alarm feedback circuit and a timing output reset circuit. The three alarm feedback circuits are the normally closed contacts of the seventh intermediate relay K07, the eighth intermediate relay K08, and the ninth intermediate relay K09, respectively. The timing output reset circuit is the timing output reset of the solenoid valve, which is achieved through three reset buttons SA1, SA2, and SA3.

[0033] In one optional embodiment, a pressure switch electrical load performance test circuit is provided, mainly composed of a power supply circuit, an electrical load test main circuit, a solenoid valve control circuit, an alarm monitoring circuit, and a fault feedback and reset circuit. In the solenoid valve control circuit, the solenoid valve is controlled by a meter control program to switch on and off 2S at a time, thereby controlling the cylinder to repeatedly operate, so that the pressure switch continuously switches on and off at a frequency of 2S on and 2S off, bearing a load current of 30A in the electrical load test main circuit. In the alarm monitoring circuit, an ammeter monitors the load current of the pressure switch. When it exceeds the alarm upper limit or falls below the alarm lower limit for a certain period of time, the ammeter alarms and outputs a signal. The corresponding electrical load test main circuit is actively cut off, the solenoid valve control circuit stops outputting, the counter in the counting circuit stops counting, and the alarm circuit responds with an alarm (corresponding indicator light illuminates). This circuit will be in continuous alarm mode, waiting for the test personnel to handle the fault. During this process, if any one of the three samples alarms, it will not affect the normal testing of the other two samples. After troubleshooting, when retesting, first press the reset switch on the ammeter (press SB1, SB2, and SB3) to return other circuits to normal operation. Figure 9 As shown, press the corresponding solenoid valve reset button (SA1, SA2 and SA3) to reset the timing output of the meter control controller to the solenoid valve control circuit. At this time, the pressure switch electrical load performance test circuit continues to be tested.

[0034] Taking the electrical load test of the No. 1 pressure switch sample as an example, the air inlet of the solenoid valve is connected to the air source. Under a 24V / 30A load, the test is conducted in a 2s on and 2s off manner. The on and off time is adjustable. The test is considered passed when the total number of tests reaches 20,000. If the pressure switch is damaged or malfunctions before reaching 20,000 tests, the test is not passed.

[0035] (1) Setting parameters of DC intelligent digital display ammeter PA1, PA2, PA3: Since the switch can only be in a continuous on or continuous off state after a fault, and there is always a load current of 30A in the main circuit of the electrical load test, the upper limit alarm value of the ammeter (continuous on): greater than or equal to 25A and exceeding 5s; the lower limit alarm value (continuous off): less than or equal to 5A and exceeding 5s; alarm lock is ON: after the alarm is generated, it will not automatically reset after the reset condition is met. It is necessary to manually press and hold the ammeter reset switch for 2s to clear the alarm before it can be reset.

[0036] (3) The program logic required for system testing is as follows: When the system is powered on, the output port will work for 2 seconds after a 2-second delay to control the intermediate relay coil, thereby controlling the solenoid valve; when an alarm occurs, the meter control input ports X1, X2, and X3 will be activated, causing the output ports Y1, Y2, and Y3 to stop working; when the alarm is processed, the solenoid valve reset button will be pressed, triggering the meter control inputs X4, X5, and X6 to be activated, causing the L1, L2, and L3 line programs to start executing again.

[0037] (4) After all the above steps are completed, turn on the solenoid valve air inlet switch, turn on the control cabinet power supply, and the electrical load performance test device enters normal working state. The counter accumulates the number of times as the pressure switch is turned on and off.

[0038] (5) When sample 1 fails, it may be in a continuously connected or continuously disconnected state. Ammeter PA1 will alarm because the current in the main circuit of the electrical load test is greater than or equal to 25A or less than or equal to 5A. The auxiliary normally closed contact 6-7 will open, and the coil of intermediate relay K07 will be de-energized. Figure 5 As shown.

[0039] (6) After the coil of intermediate relay K07 is de-energized, its normally open contacts 5-9 return to their initial state, and the coil of solid-state relay K01 is de-energized, such as Figure 4 As shown; when the coil of solid-state relay K01 is de-energized, its normally open contacts 1-2 return to their initial state, the main circuit for electrical load performance testing is disconnected, and the test circuit stops operating.

[0040] (7) After the intermediate relay K07 coil is de-energized, its normally closed contact 4-12 returns to its initial state, the input X1 of the meter control TPC8-8 is valid, and the output Y1 stops working. Figure 8 As shown; when the K04 relay coil is de-energized, the normally open contacts 5-9 of the K04 relay stop switching on and off, and the counter JSQ1 stops counting, as... Figure 7 As shown.

[0041] (8) After the intermediate relay K07 coil is de-energized, its normally open contact 7-11 returns to its initial state, the solenoid valve circuit is disconnected, the solenoid valve YV1 stops working, and the cylinder also stops its on / off action.Figure 6 As shown.

[0042] (9) After the intermediate relay K07 coil is de-energized, its normally closed contact 2-10 returns to its initial state, the cabinet door alarm circuit is activated, and the red indicator light H1 illuminates. Figure 5 As shown.

[0043] (10) At this time, because of the failure of sample #1, all related circuits have stopped working, and the alarm circuit has also issued an alarm, waiting for the test or duty personnel to handle the fault. During this process, the testing of sample #2 and sample #3 is carried out simultaneously and is not affected by the failure of sample #1. Similarly, the failure of sample #2 and sample #3 is also the same.

[0044] (11) When the fault is resolved or the sample is replaced, press the reset button on the ammeter to clear the alarm. The DC intelligent digital display ammeter will reset and start working again, and the alarm indicator light will turn off. Then press the solenoid valve reset switch to trigger the meter control inputs X4, X5, and X6 to be effective, so that the L1, L2, and L3 line programs will start executing again, and the solenoid valves YV1, YV2, and YV3 will start working again.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure switch electrical load performance testing circuit, characterized in that, It includes the main circuit for electrical load testing, the electrical load control circuit, the timing control circuit, the solenoid valve control circuit, the alarm monitoring circuit, the counting circuit, and the power supply circuit connected to each circuit; The main circuit for electrical load testing is equipped with a solid-state relay, an ammeter, and a pressure switch. The main circuit for electrical load testing is connected to the electrical load control circuit via a solid-state relay, the main circuit for electrical load testing is connected to the alarm monitoring circuit via an ammeter, and the main circuit for electrical load testing is connected to the solenoid valve control circuit via a pressure switch. Both the timing control circuit and the alarm monitoring circuit are equipped with intermediate relays. The timing control circuit and the alarm monitoring circuit are respectively connected to the solenoid valve control circuit through intermediate relays, and the alarm monitoring circuit is connected to the electrical load control circuit through intermediate relays. The counting circuit is connected to the intermediate relay of the timing control circuit.

2. The pressure switch electrical load performance testing circuit according to claim 1, characterized in that, The power supply circuit includes a first DC power supply circuit and a second DC power supply circuit. The first DC power supply circuit is connected to the main circuit for electrical load testing, and the second DC power supply circuit is connected to the electrical load control circuit, the timing control circuit, the solenoid valve control circuit, and the alarm monitoring circuit.

3. The pressure switch electrical load performance testing circuit according to claim 2, characterized in that, An air switch is installed in both the first DC power supply circuit and the second DC power supply circuit.

4. The pressure switch electrical load performance testing circuit according to claim 2, characterized in that, The power supply circuit also includes a cooling fan power supply circuit, which is equipped with a cooling fan and a temperature controller.

5. The pressure switch electrical load performance testing circuit according to claim 4, characterized in that, An air switch is also installed in the power supply circuit of the cooling fan.

6. The pressure switch electrical load performance testing circuit according to claim 1, characterized in that, The normally open contact of the intermediate relay of the electrical load control circuit is connected to the alarm monitoring circuit. The alarm monitoring circuit includes a fault control circuit and a fault indication circuit. The fault control circuit includes a normally closed contact of the ammeter and an intermediate relay coil. The fault indication circuit includes a normally closed contact of the intermediate relay and an alarm indicator light.

7. The pressure switch electrical load performance testing circuit according to claim 1, characterized in that, The timing control loop is equipped with a meter control controller, and the input terminal of the meter control controller is connected to an alarm feedback loop and a timing output reset loop.

8. The pressure switch electrical load performance testing circuit according to claim 7, characterized in that, The timing output reset circuit is equipped with a solenoid valve reset button.

9. The pressure switch electrical load performance testing circuit according to claim 1, characterized in that, The ammeter uses an AC digital display current controller.

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