Device for detecting on-off state of electromagnetic valve in in-loop test of air suspension controller

Abstract

The utility model relates to an air suspension controller in-loop test solenoid valve on-off state detection device. The device comprises an air suspension controller to be detected; the electromagnetic valve signal acquisition device comprises a plurality of magnetic sensitive switches, and the magnetic sensitive switches are arranged in an electromagnetic valve coil of the air suspension controller to be detected and are turned on or turned off according to the power-on state of the electromagnetic valve coil; and the in-loop test cabinet is used for detecting and obtaining the on-off state of the electromagnetic valve corresponding to the air suspension controller to be detected according to the on-off state of each magnetic sensitive switch. According to the utility model, on the premise of ensuring the software and hardware integrity of the detected air suspension controller, the detection of the on-off state of the electromagnetic valve in the air suspension controller can be realized.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve switch status detection technology, and in particular to a device for detecting the switch status of an air suspension controller in a loop test. Background Technology

[0002] Air suspension controllers automatically adjust and maintain vehicle height based on driving conditions, improving vehicle passability, handling, and stability, and have become standard equipment in most high-end models. Compared to traditional suspensions, air suspensions not only significantly improve ride comfort but also offer design functions such as energy saving, off-road capability, ease of entry and exit, and battery protection by raising or lowering the vehicle body. Based on the degree of air exchange between the controller and the outside air, air suspension systems can be divided into open and closed systems.

[0003] HIL testing, short for Hardware-in-the-Loop (HIL) testing, is a technology for the development and testing of complex device controllers. It allows for comprehensive testing of the controller without directly controlling the actual controlled object, avoiding the safety risks that may arise from testing in a real-world environment.

[0004] The closed-loop air suspension controller uses a direct-drive method where the control pins of the solenoid valves (including one exhaust valve, four air spring valves, and four directional valves, totaling nine solenoid valves) are directly soldered onto the controller without being routed through a wiring harness. Therefore, when testing the controller using a HIL (High-Intensity Link) test bench, it's impossible to detect whether the solenoid valves are open via the wiring harness. Currently, there are two common solutions: 1. Using a fly-wire to the solder joint between the solenoid valve and the controller, and detecting the solenoid valve's on / off signal through the other end of the fly-wire; 2. Modifying the program to send the solenoid valve's on / off signal to CAN bus for interaction. However, both solutions compromise the integrity of the controller under test: the first solution adds solder points to the controller, potentially causing unknown effects on other parts of the controller hardware; the second solution modifies the software under test, potentially masking or introducing bugs in the controller software.

[0005] Therefore, a device is needed that can detect the on / off state of the solenoid valve while ensuring the integrity of the hardware and software of the controller under test, so as to perform a complete test on the closed air suspension controller. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a solenoid valve switching status detection device for air suspension controller in-loop testing, which can detect the switching status of solenoid valves in the air suspension controller while ensuring the integrity of the hardware and software of the air suspension controller under test.

[0007] The technical solution adopted by this utility model to solve its technical problem is: to provide a device for detecting the on / off state of an air suspension controller's in-loop test solenoid valve, comprising:

[0008] The air suspension controller to be tested is used to control the switching of its solenoid valves;

[0009] The solenoid valve signal acquisition device includes several magnetic switches, which are placed inside the solenoid valve coil of the air suspension controller under test, and are opened or closed according to the energization state of the solenoid valve coil.

[0010] In-loop testing cabinet, used to detect the switching status of the solenoid valve corresponding to the air suspension controller under test based on the switching status of each of the magnetic switches.

[0011] Furthermore, the magnetic switch is a reed switch.

[0012] Furthermore, each reed switch corresponds one-to-one with the solenoid valve coil of the air suspension controller under test, and each reed switch is located in the middle of the corresponding solenoid valve coil.

[0013] Furthermore, the positions of each reed switch in the solenoid valve signal acquisition device are fixed and matched with the positions of the corresponding solenoid valve coils, so that after the solenoid valve signal acquisition device is engaged with the air suspension controller under test, each reed switch is located in the middle of the corresponding solenoid valve coil.

[0014] Furthermore, one end of the magnetic switch is connected to the grounding terminal of the air suspension controller under test, and the other end of the magnetic switch is connected to the in-loop test cabinet.

[0015] Furthermore, the magnetic switch is connected to the air suspension controller under test via a control grounding pin harness.

[0016] Furthermore, the magnetic switch is connected to the in-loop test cabinet via a signal transmission harness.

[0017] Beneficial effects

[0018] By adopting the above-mentioned technical solution, this utility model has the following advantages and positive effects compared with the prior art: This utility model places the magnetic sensitive switch in the middle of the solenoid valve coil of the air suspension and uses the magnetic induction characteristics of the magnetic sensitive switch to determine whether the solenoid valve is energized and opened. Under the premise of ensuring the integrity of the hardware and software of the controller under test, the opening and closing status of the solenoid valve can be detected, thereby conducting a complete test on the closed air suspension controller. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the position of the controller direct-drive solenoid valve according to an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the reed switch position of the solenoid valve signal acquisition device according to an embodiment of this utility model;

[0021] Figure 3 This is a wiring diagram of the electromagnetic valve signal acquisition device according to an embodiment of this utility model. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0023] The present invention relates to an air suspension controller in-loop test solenoid valve switch status detection device, including a solenoid valve signal acquisition device and an in-loop test (HIL) cabinet.

[0024] The solenoid valve signal acquisition device includes several magnetic switches, which are placed inside the solenoid valve coil of the air suspension controller under test. Each solenoid valve coil contains one magnetic switch, which opens or closes according to the energization state of the solenoid valve coil, thus detecting the energization status of the solenoid valve. Reed switches can be used as the magnetic switches. When the solenoid valve is energized and opened, the coil generates a magnetic field. Based on the characteristics of the reed switch (the applied magnetic field causes different polarities near the endpoints of the two reeds; when the magnetic force exceeds the reed's elasticity, the two reeds attract each other, conducting the circuit; when the magnetic field weakens or disappears, the reed releases due to its elasticity, and the contacts separate, thus opening the circuit), the designed circuit is either open or closed, which is used to determine whether the solenoid valve has been opened by the controller.

[0025] The HIL cabinet is used to house corresponding air suspension system models. It detects the on / off state of the solenoid valve under test via a solenoid valve signal acquisition device, mapping this information to the mounted model and initiating corresponding on / off actions on the solenoid valve within the model. When configuring the solenoid valve model in the HIL, the input control signal can be configured so that when the HIL detects that the signal is at the configured level, it opens the mounted solenoid valve model.

[0026] The following description, in conjunction with the accompanying drawings and the closed air suspension controller, will further illustrate this embodiment.

[0027] The pins controlling the nine solenoid valves (four directional valves, four air spring valves, and one exhaust valve) and the motor pump of the closed air suspension controller are directly soldered to the controller for control. The remaining electrical signals in the closed air suspension controller (accelerometer, height sensor, CDC damper solenoid valve, power supply, and CAN signal) are all connected out through the controller wiring harness.

[0028] Figure 1 The positions of the nine circles shown represent the positions of the nine solenoid valve coils directly driven by the closed air suspension controller under test. Figure 2 The positions of the nine circles shown correspond one-to-one with the positions of the nine reed switches in the solenoid valve signal acquisition device involved in this utility model. The positions of the nine reed switches are determined based on the positions of the nine solenoid valve coils, ensuring that after the solenoid valve signal acquisition device and the closed air suspension controller are engaged, the nine reed switches are positioned in the middle of the nine solenoid valve coils. In the circuit design, a reed switch is placed in the middle of each circuit path, with one end connected to the ground terminal of the controller wiring harness and the other end input to the HIL cabinet required for hardware-in-the-loop testing. This serves as a low-side electrical signal input to the HIL cabinet. Upon receiving the low-side electrical signal, the cabinet transmits it to the simulated closed air suspension system model to switch the solenoid valves on and off. During the hardware-in-the-loop testing of the controller under test, the wiring harness connections of the HIL cabinet, the solenoid valve signal acquisition device, and the controller under test are as follows: Figure 3 As shown, the switches labeled 1-9 are 9 reed switches.

[0029] The following section explains how to detect the energization status of the solenoid valve during hardware-in-the-loop testing of the controller under test, from both structural and signal logic perspectives.

[0030] Structurally: The solenoid valve signal acquisition device and the controller under test are fastened together, so that the nine reed switches in the solenoid valve signal acquisition device are positioned one-to-one with the nine solenoid valve coils of the controller under test. For example... Figure 3 As shown, one end of the solenoid valve signal acquisition device is connected to the grounding terminal of the controller under test through the control grounding pin harness, and the other end of the solenoid valve signal acquisition device is connected to the HIL cabinet through the signal transmission harness.

[0031] In terms of signal logic: When the output current of the controller under test drives the solenoid valve to open, the magnetic field generated by the solenoid valve coil causes the reed switch to conduct and close, forming a path between the controller ground pin harness and the signal transmission harness, thereby transmitting the low-level signal to the HIL cabinet.

[0032] A model of a closed air suspension system was built in the HIL cabinet. The nine controlled solenoid valves in the model were configured as external load signal inputs, with the signals configured to be active low. That is, when the detection result of the signal transmission harness input to the nine solenoid valves in the HIL cabinet is low, the nine controlled solenoid valves in the model are in the open state; otherwise, they are in the closed state. When the controller under test does not output a solenoid valve control signal, the solenoid valve coil is not energized, the reed switch in the solenoid valve signal acquisition device is in the open circuit state, and the nine solenoid valves in the HIL cabinet model appear to be in the closed state. When the controller under test outputs a solenoid valve control signal, the solenoid valve coil is energized, and the reed switch in the solenoid valve signal acquisition device is affected by the magnetic field generated by the solenoid valve coil and becomes open, and the nine solenoid valves in the HIL cabinet model appear to be in the open state.

Claims

1. A device for detecting the on / off state of a solenoid valve in an air suspension controller loop test, characterized in that, include: The air suspension controller to be tested is used to control the switching of its solenoid valves; The solenoid valve signal acquisition device includes several magnetic switches, which are placed inside the solenoid valve coil of the air suspension controller under test, and are opened or closed according to the energization state of the solenoid valve coil. In-loop testing cabinet, used to detect the switching status of the solenoid valve corresponding to the air suspension controller under test based on the switching status of each of the magnetic switches.

2. The apparatus according to claim 1, characterized in that, The magnetic switch is a reed switch.

3. The apparatus according to claim 2, characterized in that, Each reed switch corresponds one-to-one with the solenoid valve coil of the air suspension controller under test, and each reed switch is located in the middle of the corresponding solenoid valve coil.

4. The apparatus according to claim 3, characterized in that, The positions of each reed switch in the solenoid valve signal acquisition device are fixed and matched with the positions of the corresponding solenoid valve coils, so that after the solenoid valve signal acquisition device is engaged with the air suspension controller under test, each reed switch is located in the middle of the corresponding solenoid valve coil.

5. The apparatus according to claim 1, characterized in that, One end of the magnetic switch is connected to the grounding terminal of the air suspension controller under test, and the other end of the magnetic switch is connected to the in-loop test cabinet.

6. The apparatus according to claim 5, characterized in that, The magnetic switch is connected to the air suspension controller under test via a control grounding pin harness.

7. The apparatus according to claim 5, characterized in that, The magnetic switch is connected to the in-loop test cabinet via a signal transmission harness.

Images