A comprehensive performance testing method for suspension air supply modules

Abstract

This invention provides a method for comprehensive performance testing of a suspension air supply module, comprising: receiving control commands from a bus testing tool, the control commands being used to control pressure pump adjustment and valve opening and closing to achieve air path switching between the air tank, inflation channel, exhaust channel, and wheel cylinder; and testing the suspension air supply module according to the control commands. Different air path configurations can be flexibly set according to different testing items, without limiting the test model and test sequence. It features a high degree of automation, short test cycle, reliable test results, and good repeatability, providing a reference for the standardization of ASU comprehensive performance testing.

Description

Technical Field

[0001] This invention relates to the field of intelligent testing technology for automotive parts, specifically to a comprehensive performance testing method for a suspension air supply module. Background Technology

[0002] The Air Supply Unit (ASU) is the core component of the air suspension system, responsible for air compression, distribution, and pressure regulation. Its performance directly affects suspension height adjustment speed, energy efficiency, and system stability. Testing must verify its functional integrity under different loads, temperatures, and vibrations, such as air supply efficiency, airtightness, and response speed. ASU malfunction (e.g., air leakage or pressure runaway) can lead to abnormal vehicle height, decreased driving stability, and even damage to the battery (in electric vehicle scenarios). Testing can help identify potential problems such as mechanical fatigue and electrical control logic errors in advance. The air suspension needs to adjust stiffness and damping in real time according to vehicle speed and road conditions. The ASU must work in conjunction with the controller and sensors; testing must simulate complex dynamic conditions (e.g., high-frequency vibration, sudden temperature changes) to verify its control accuracy and durability. Although domestically produced ASUs are gradually replacing imported products, they need to pass rigorous testing to prove their performance meets international standards (such as WABCO and AMK) to reduce automakers' procurement costs and enhance market competitiveness.

[0003] However, existing testing methods for ASU have the following limitations: Environmental simulation limitations: Traditional bench testing struggles to reproduce high-frequency random vibrations or extreme temperature and humidity conditions in real-world road environments, preventing the detection of some potential faults; Lack of dynamic response testing: Existing methods focus primarily on static parameters, failing to adequately verify the response speed and stability of ASU under dynamic scenarios such as rapid acceleration / braking and continuous load changes; High integration testing difficulty: ASU involves the coordination of multiple components such as motors, compressors, and valves. Existing testing equipment often employs a split-type design, making it impossible to simulate the real-time interaction between the controller and actuators, resulting in difficulties in timely detection of hardware and software coordination issues. The following issues exist: Lack of control algorithm verification: Testing focuses primarily on mechanical performance, with insufficient verification of control logic, making it difficult to assess compatibility with the vehicle domain controller; Reliance on imported equipment: High-performance test benches are expensive, unaffordable for small and medium-sized enterprises, limiting test coverage; Low automation: Existing methods rely on manual operation, resulting in long testing cycles and limited data acquisition accuracy, failing to meet the demands of large-scale mass production; Lack of unified standards: Different automakers have significantly different ASU performance requirements, and test parameters (such as fatigue life and sealing thresholds) lack industry consensus, leading to poor comparability of test results; Lagging adaptation to new components: For example, the application of dual-port NVMe SSDs or new sensor technologies has not been updated in a timely manner by existing testing methods, making it difficult to assess their compatibility with the ASU control system. Establishing a systematic testing method for the various functions, stability, and reliability of the suspension air supply module helps ensure its performance under real-world conditions meets design requirements.

[0004] The foregoing background information is intended to help those skilled in the art understand prior art that is similar to the present invention, and to facilitate the understanding of the inventive concept and technical solution of the present invention. It should be clearly stated that, in the absence of clear evidence that the above content was disclosed before the filing date of this patent application, the foregoing background information should not be used to evaluate the novelty of the technical solution of this application. Summary of the Invention

[0005] Technical issues

[0006] To address the aforementioned issues, the present invention aims to provide a comprehensive performance testing method for suspension air supply modules. This method allows for flexible configuration of different air paths based on the specific testing items, without limitations on test models or test sequences. It features high automation, short testing cycles, reliable test results, and excellent repeatability, providing a reference for the standardization of ASU comprehensive performance testing.

[0007] Technical solution

[0008] That is, the present invention is:

[0009] A method for comprehensive performance testing of a suspension air supply module includes:

[0010] The system receives control commands from the bus detection tool. These commands are used to control the pressure pump adjustment and valve opening and closing to achieve air path switching between the air tank, the air filling channel, the air exhaust channel, and the wheel cylinder.

[0011] The suspension air supply module is tested according to the control command, including:

[0012] According to the control command, the ASU module under test is connected to the test bench through a multi-way pneumatic control valve, and a pneumatic circuit including an air tank, a variable volume load and a pressure sensor is configured.

[0013] The programmable power supply provides the operating voltage to the ASU module and establishes a CAN communication connection;

[0014] Select the air path according to the control command, control the opening and closing status of the corresponding solenoid valve, and read the detection data simultaneously;

[0015] The variable volume load driven by the motor simulates the changes in the actual vehicle height, and the height signal is transmitted to the ECU in real time.

[0016] Furthermore, it also includes: plotting data curves based on the read test data to determine the performance indicators of each test item.

[0017] Furthermore, the test of the suspension air supply module according to the control command includes a front axle closed-loop lift test, which includes: opening the solenoid valves of the air tank and the front axle bladder, increasing the bladder load pressure to the target value, simulating the front axle lifting condition of a real vehicle, controlling the motor to automatically adjust the variable volume capacity according to the pressure change, simulating the height feedback of a real vehicle, and transmitting the height signal to the product ECU to read the test data.

[0018] Furthermore, the specific implementation steps of the front axle closed-loop lift test include:

[0019] 1.1 Pre-inflation stage: Set the electric proportional valve air pressure to the first air pressure, and open the air control valves QV01~QV04 and QV06 to perform pre-inflation;

[0020] 1.2 Pressure Equilibrium Stage: After maintaining inflation for the predetermined time, the pressure stabilizes.

[0021] 1.3 Test execution phase: Activate SV3, SV1, AV1, and AV2 solenoid valves and start the pressure pump to control the variable volume pressure at the FL / FR end to rise to the target value;

[0022] 1.4 Dynamic Feedback Stage: Automatically adjusts the variable volume capacity according to pressure changes, and synchronously records current, voltage, pressure, CDC stiffness valve status and time parameters.

[0023] Furthermore, the first air pressure is 5 to 20 bar, preferably 5 to 15 bar, more preferably 5 to 10 bar, and most preferably 8 bar.

[0024] Furthermore, the first time is 1 to 30 seconds, preferably 5 to 20 seconds, more preferably 5 to 15 seconds, and most preferably 10 seconds.

[0025] Furthermore, the step of testing the suspension air supply module according to the control command includes a test of the air replenishment function, which includes: opening the solenoid valve that controls the on / off state of the air tank, controlling the motor to fill the wheel-end air tank with air to the set pressure, and recording the test data during the process.

[0026] Furthermore, the specific implementation steps of the Qi replenishment function test include:

[0027] 2.1 Load Connection Stage: Open the QV07~QV10 pneumatic control valves to establish a four-wheel load connection;

[0028] 2.2 Inflation Test Phase: Activate SV1, AV1~AV4 solenoid valves and start the pressure pump to inflate the four-wheel air tanks to the set pressure;

[0029] 2.3 Data reading stage: Real-time recording of flow parameters and pressure-time curves during the inflation process.

[0030] Furthermore, the detection of the suspension air supply module according to the control command includes a power limiting valve opening test, which includes: pre-filling the air tank to the second air pressure, controlling the motor to fill the air tank to the pressure change point and delaying the motor power-off, the highest pressure point being the safe pressure, and reading the detection data.

[0031] Furthermore, the specific implementation steps for the power limiting valve opening test are as follows:

[0032] 3.1 Pre-charge preparation: Pre-charge the gas tank to the second pressure, and open the QV11 pneumatic control valve to connect the load at the RES1 end;

[0033] 3.2 Overload test phase: Activate the SV4 solenoid valve and continuously increase the pressure until the pressure change point;

[0034] 3.3 Safety Protection Phase: Delayed motor power cut-off upon detection of sudden pressure change;

[0035] 3.4 Parameter recording stage: Capture the highest pressure value as the safe pressure threshold.

[0036] Furthermore, the second air pressure is 10-20 bar, preferably 10-18 bar, more preferably 12-18 bar, and most preferably 15 bar.

[0037] Furthermore, the time for delaying the power-off of the motor is 1ms to 2s, preferably 10ms to 2s, more preferably 50ms to 2s, and most preferably 1s.

[0038] Furthermore, the detection of the suspension air supply module according to the control command includes a front axle closed descent test, which includes: opening the solenoid valves of the air tank and the front axle bladder, controlling the motor to reduce the pressure inside the variable volume load of FL and FR to the target value, simulating the front axle descent condition of a real vehicle, automatically adjusting the variable volume capacity through the motor force feedback mode, simulating the height feedback of a real vehicle, and simultaneously transmitting the height signal to the product ECU and reading the test data.

[0039] Furthermore, the specific implementation steps of the front axle closed-loop descent test include:

[0040] 4.1 Pre-inflation stage: Set the electric proportional valve air pressure to the third air pressure, and open air control valves QV01~QV04 and QV06;

[0041] 4.2 Pressure Reduction Test Phase: Activate SV2, SV4, AV1, and AV2 solenoid valves and start the pressure pump;

[0042] 4.3 Force Feedback Adjustment Stage: The variable volume capacity is automatically adjusted through the motor force feedback mode;

[0043] 4.4 Data Reading Stage: Record the dynamic parameter curves of the pressure drop process at the FL / FR end.

[0044] Furthermore, the third pressure is 5 to 20 bar, preferably 5 to 15 bar, more preferably 5 to 10 bar, and most preferably 8 bar.

[0045] Furthermore, the reading and detection data includes at least one of the following: current, voltage, pressure, flow rate, CDC stiffness valve output status, and time.

[0046] Furthermore, the reading and detection data also includes plotting data curves.

[0047] Furthermore, the variable volume load includes: a volume-adjustable piston cylinder assembly, a servo motor linked to the cylinder, a high-precision displacement sensor, and / or a temperature-compensated pressure transmitter.

[0048] Furthermore, the gas path switching control includes: using binary encoding to combine and control 12 gas control valves, setting a gas path status self-test program to verify the integrity of the path, and / or configuring an emergency exhaust channel to achieve rapid pressure relief.

[0049] Furthermore, the method for detecting pressure inflection points includes: setting a pressure change rate threshold ΔP / Δt ≥ 5 bar / s, using a sliding window algorithm to identify pressure inflection points, and / or combining spectral analysis to eliminate pressure oscillation interference.

[0050] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined to obtain specific implementation methods.

[0051] Beneficial effects

[0052] This invention provides a comprehensive performance testing method for suspension air supply modules (ASUs). Applied to the field of intelligent testing of automotive parts, it improves the schematic diagram of the comprehensive performance testing method for ASUs. By adjusting the pressure pump and opening and closing various valves, different air paths are established between the air tank, inflation, deflation, and wheel cylinders. Different air path configurations are set according to different testing items, thereby completing the comprehensive performance testing of the suspension air supply module. It is suitable for systematic testing of ASU performance. Hardware is used to switch air paths to complete various ASU tests. The software employs modular programming, allowing users to adjust control commands as needed, within hardware limits, for flexible testing. It also supports functions such as saving, copying, and switching test methods for repeated testing. Test data is automatically saved, and users can retrieve and view past data conclusions at any time. The software supports data export for further data processing and analysis.

[0053] The present invention adopts the above-mentioned technical solution to achieve the above objectives, which makes up for the shortcomings of the prior art, is reasonably designed, and is easy to operate. Attached Figure Description

[0054] To make the above and / or other objects, features, advantages and examples of the present invention more apparent and understandable, the accompanying drawings used in the specific embodiments of the present invention 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 from these drawings without creative effort.

[0055] Figure 1 A schematic diagram of the test bench piping status illustrating the comprehensive performance testing method for the suspension air supply module;

[0056] Figure 2 A schematic diagram showing the test bench piping status during the pre-inflation phase of the front axle closed-loop ascent test and the front axle closed-loop descent test.

[0057] Figure 3 A schematic diagram of the test bench piping status during the air pressure balance phase of the front axle closed-loop ascent test and the front axle closed-loop descent test.

[0058] Figure 4 A schematic diagram showing the product's airflow status during the front axle closed-loop rise test.

[0059] Figure 5 A schematic diagram showing the test bench piping status during the equipment load connection phase of the gas replenishment function test;

[0060] Figure 6 A schematic diagram showing the gas path status of the product during the gas replenishment function test;

[0061] Figure 7 A schematic diagram of the test bench piping status during the equipment load connection phase of the power limiting valve opening test;

[0062] Figure 8 A schematic diagram showing the product's air circuit status during the power limiting valve opening test;

[0063] Figure 9 This is a schematic diagram showing the product's airflow status during the front axle closed-loop descent test.

[0064] Among them, QV01~QV19 represent pneumatic control valves; T1&H1~T6&H6 represent temperature and humidity meters; P1~P6 represent air pressure sensors; I-U1~I-U4 represent grating rulers; I-M1~I-M4 represent regulating motors; ID1 represents dryer; A1 and A2 represent pressure gauges; V1 and V2 represent one-way valves; AS1 and AS2 represent current sensors; and FL, FR, RL, and RR represent the left front wheel cylinder, right front wheel cylinder, left rear wheel cylinder, and right rear wheel cylinder, respectively. Detailed Implementation

[0065] Those skilled in the art can refer to the content of this document and appropriately replace and / or modify the process parameters to achieve the desired results. However, it should be particularly noted that all similar replacements and / or modifications are obvious to those skilled in the art and are considered to be included in this invention. The products and preparation methods described in this invention have been described through preferred examples, and those skilled in the art can obviously modify or appropriately change and combine the products and preparation methods described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0066] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this invention pertains. This invention uses the methods and materials described herein; however, other suitable methods and materials known in the art may also be used. The materials, methods, and examples described herein are illustrative only and are not intended to be limiting. All publications, patent applications, patent cases, provisional applications, database entries, and other references mentioned herein are incorporated herein by reference in their entirety. In case of conflict, the definitions included in this specification shall prevail.

[0067] Unless otherwise specified, the materials, methods, and examples described herein are exemplary and not limiting. While similar or equivalent methods and materials can be used to implement or test the invention, suitable methods and materials are described herein.

[0068] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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. Furthermore, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0069] To facilitate understanding of the embodiments of the present invention, the abbreviations and key terms that may be involved in the embodiments of the present invention will first be explained or defined. For undefined abbreviations or key terms, they are all conventionally understood by those skilled in the art.

[0070] Furthermore, unless otherwise specified, the experimental methods used in the embodiments are conventional methods; the materials and reagents used are commercially available unless otherwise specified. Reagents or instruments whose manufacturers are not specified are all commercially available products. All disclosures and other references mentioned herein are incorporated herein by reference in their entirety.

[0071] The present invention is described in detail below.

[0072] Example 1:

[0073] This embodiment provides a comprehensive performance testing method for a suspension air supply module. A schematic diagram of the test bench piping is shown below. Figure 1 As shown, the comprehensive performance testing method includes: receiving control commands from a bus testing tool, wherein the control commands are used to control the adjustment of the pressure pump and the opening and closing of the valves to realize the switching of the air path between the air tank, the air filling channel, the air exhaust channel and the wheel cylinder.

[0074] The detection of the suspension air supply module according to the control command includes the following steps:

[0075] Establish pneumatic connection: Connect the ASU module under test to the test bench through a multi-way pneumatic control valve, and configure a pneumatic circuit including an air tank, a variable volume load and a pressure sensor;

[0076] Startup control program: Provide operating voltage to the ASU module via programmable power supply and establish CAN communication connection;

[0077] Execute the testing process: Select the air path according to the control command, control the opening and closing status of the corresponding solenoid valve, and read the test data simultaneously;

[0078] Dynamic feedback adjustment: The variable volume load driven by the motor simulates the actual vehicle height change and transmits the height signal to the ECU in real time;

[0079] Generate test reports: Plot data curves based on the read test data to determine the performance indicators of each test item.

[0080] This embodiment is based on the control command of the front axle closed lifting test. Specifically, it includes: opening the solenoid valves of the air tank and the front axle bladder, increasing the bladder load pressure to the target value, simulating the front axle lifting condition of a real vehicle, controlling the motor to automatically adjust the variable volume capacity according to the pressure change, simulating the height feedback of a real vehicle, and transmitting the height signal to the product ECU to read the test data.

[0081] The detailed implementation steps are as follows:

[0082] 1. Equipment pre-charge: Set the electro-proportional valve to 8 bar. Open the test bench pneumatic control valves QV01, QV02, QV03, QV04, and QV06 to pre-charge the variable volume at the FL, FR, RR, and RL terminals with an air pressure of 8 bar. The test bench piping status is as follows: Figure 2 As shown;

[0083] 2. Pressure Balancing: After inflation for 10 seconds, stop inflation and enter the balancing phase to wait for the pressure to stabilize; the test bench piping status is as follows. Figure 3 As shown;

[0084] 3. Start Testing: The product is connected to a DC12V power supply via a programmable power supply and ignited. The test bench opens valves SV3, SV1, AV1, and AV2 via CAN communication and starts the product motor. The product's air circuit status is shown in the figure. This causes the pressure in the variable volumes of FL and FR to rise to the target value. The equipment, through its program, automatically adjusts the variable volume capacity of the motor according to the pressure change, simulating the height feedback of a real vehicle. Simultaneously, the equipment transmits a height signal to the ECU, records configuration data such as current / voltage / pressure / CDC stiffness valve output status / time during the test, and plots data curves. The product air circuit status is shown in the figure. Figure 4 As shown.

[0085] Example 2:

[0086] Based on the aforementioned embodiments, the test is performed according to the control command for the air replenishment function test. Specifically, the test includes: opening the solenoid valve that controls the on / off state of the air tank on the product side, sending a message command to the product via CAN communication or controlling the rotating motor of the device, filling the air tanks at the FL, FR, RR, and RL ends with air to the set pressure, turning off the motor, and recording the configuration data such as current / voltage / pressure / flow / time during the process, while plotting the data curve.

[0087] The detailed steps are as follows:

[0088] 1. Equipment Load Connection: Open the pneumatic control valves QV07, QV08, QV09, and QV10 on the test bench, and connect the FL, FR, RR, and RL terminals of the product to the variable volume load; the test bench piping status is as follows. Figure 5 As shown;

[0089] 2. Start Testing: The product is powered by a programmable power supply connected to DC 12V and ignited. The test bench opens valves SV1, AV1, AV2, AV3, and AV4 via CAN communication and starts the product motor. The product's pneumatic circuit status is shown in the diagram. This raises the pressure within the variable volumes at terminals FL, FR, RR, and RL to the target value. Simultaneously, the equipment transmits a height signal to the ECU, records configuration data such as current, voltage, pressure, and time during the test, and plots data curves. The product's pneumatic circuit status is shown in the diagram. Figure 6 As shown.

[0090] Example 3:

[0091] Based on the aforementioned embodiments, the test is conducted according to the control command for the power limiting valve opening test. Specifically, the test includes: pre-filling the gas tank with about 15 bar of gas; the test bench sends a message command to the product via CAN communication to control the rotating motor; when the gas tank is filled to the pressure change (decrease) point, the motor is de-energized after a 1-second delay; and the configuration data such as current / voltage / pressure / flow / time during the process are recorded. The highest pressure point is the safe pressure.

[0092] The detailed steps are as follows:

[0093] 1. Equipment Load Connection: Open the pneumatic control valve QV11 on the test bench and connect the RES1 end of the product to the load tank; the bench piping status is as follows. Figure 7 As shown;

[0094] 2. Start Testing: The product is powered by a programmable power supply connected to DC 12V and ignited. The test bench opens valve SV4 via CAN communication and starts the product motor. The product's pneumatic circuit status is shown in the figure. This causes the pressure within the load at the RES terminal to rise. The test stops after reaching the pressure surge value. Data such as current, voltage, pressure, and time are recorded during the test, and data curves are plotted. The product's pneumatic circuit status is shown in the figure. Figure 8 As shown.

[0095] Example 4:

[0096] Based on the aforementioned embodiments, the test is conducted according to the control command of the front axle closed descent test, including: opening the solenoid valves of the product-side control air tank and front axle bladder, sending message commands to the product via CAN communication or controlling the rotation motor of the device to reduce the pressure inside the variable volume load of FL and FR to the target value, simulating the front axle descent condition of a real vehicle. The device can automatically adjust the variable volume capacity through the motor force feedback mode to simulate the height feedback of a real vehicle. During the test, the device transmits the height signal to the product ECU, records the configuration data such as current / voltage / pressure / time during the process, and plots the data curves.

[0097] The detailed steps are as follows:

[0098] 1. Equipment pre-charge: Set the electro-proportional valve to 8 bar. Open the test bench pneumatic control valves QV01, QV02, QV03, QV04, and QV06 to pre-charge the variable volume at the FL, FR, RR, and RL terminals with an air pressure of 8 bar. The test bench piping status is as follows: Figure 2 As shown;

[0099] 2. Pressure Balancing: After inflation for 10 seconds, stop inflation and enter the balancing phase to wait for the pressure to stabilize; the test bench piping status is as follows. Figure 3 As shown;

[0100] 3. Start Testing: The product is powered by a programmable power supply connected to DC 12V and ignited. The test bench opens valves SV2, SV4, AV1, and AV2 via CAN communication and starts the product motor. The product's pneumatic path is shown in the diagram. This reduces the pressure within the variable volumes FL and FR to the target set value. Simultaneously, the equipment transmits an altitude signal to the ECU and records data such as current, voltage, pressure, and time during the test, and plots the data curves. The product's pneumatic path status is shown in the diagram. Figure 9 As shown.

[0101] By adjusting the pressure pump and opening and closing various valves, different air paths are established between the air tank, inflation, deflation, and wheel cylinders. Different air path configurations can be flexibly set according to different test items, thereby completing the comprehensive performance test of the suspension air supply module. This includes, but is not limited to, various test modes and test sequences such as front axle closed descent test, air replenishment function test, power limit valve opening test, and front axle closed descent test. The test is highly automated, has a short test cycle, reliable test results, and good repeatability, providing a reference for the standardization of ASU comprehensive performance testing.

[0102] The conventional techniques described in the above embodiments are existing technologies known to those skilled in the art, and therefore will not be described in detail here.

[0103] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0104] Although the present invention has been described in detail and specific embodiments have been cited, it will be apparent to those skilled in the art that various changes or modifications can be made without departing from the spirit and scope of the invention.

[0105] While the foregoing detailed descriptions have shown, described, and pointed out novel features applicable to various embodiments, it should be understood that various omissions, substitutions, and changes may be made to the form and details of the described apparatus or methods without departing from the spirit of this disclosure. Furthermore, the various features and methods described above may be used independently of each other or may be combined in various ways. All possible combinations and sub-combinations are intended to fall within the scope of this disclosure. Many of the foregoing embodiments include similar components, and therefore, these similar components are interchangeable in different embodiments. Although the invention has been disclosed in the context of certain embodiments and examples, those skilled in the art will understand that the invention extends beyond the specifically disclosed embodiments to other alternative embodiments and / or applications, as well as their obvious modifications and equivalents. Therefore, the invention is not intended to be limited to the specific disclosure of the preferred embodiments herein.

[0106] All matters not covered in this invention are common knowledge.

Claims

1. A method for comprehensive performance testing of a suspension air supply module, characterized in that... include: Receive control commands from the bus detection tool. The control commands are used to control the pressure pump adjustment and valve opening and closing to realize the air path switching between the air tank, the air filling channel, the air exhaust channel and the wheel cylinder. The suspension air supply module is tested according to the control command, including: According to the control command, the ASU module under test is connected to the test bench through a multi-way pneumatic control valve, and a pneumatic circuit including an air tank, a variable volume load and a pressure sensor is configured. The programmable power supply provides the operating voltage to the ASU module and establishes a CAN communication connection; Select the air path according to the control command, control the opening and closing status of the corresponding solenoid valve, and read the detection data simultaneously; The variable volume load driven by the motor simulates the actual vehicle height change and transmits the height signal to the ECU in real time. The detection of the suspension air supply module according to the control command includes a power limiting valve opening test: the air tank is pre-filled to the second air pressure, the control motor is used to fill the air tank to the pressure change point, the motor is de-energized after a 1-second delay, the highest pressure point is the safe pressure, and the detection data is read. The specific implementation steps for the power limiting valve opening test are as follows: Pre-charge preparation: Pre-charge the gas tank to the second pressure, and open the QV11 pneumatic control valve to connect the load at the RES1 end; Overload test phase: Activate the SV4 solenoid valve and continuously increase the pressure until the pressure change point; Safety protection phase: Delays motor power cut-off upon detection of sudden pressure change; Parameter recording phase: Capture the highest pressure value as the safe pressure threshold.

2. The method according to claim 1, characterized in that: The test of the suspension air supply module according to the control command includes a front axle closed-loop lift test: the solenoid valves of the air tank and the front axle bladder are opened, the bladder load pressure is increased to the target value, simulating the front axle lifting condition of a real vehicle, the control motor automatically adjusts the variable volume capacity according to the pressure change, simulating the height feedback of a real vehicle, and at the same time transmitting the height signal to the product ECU to read the test data.

3. The method according to claim 1, characterized in that: The test of the suspension air supply module according to the control command includes the air replenishment function test: opening the solenoid valve that controls the on / off of the air tank, controlling the motor to fill the air tank at the wheel end with air to the set pressure, and recording the test data during the process.

4. The method according to claim 1, characterized in that: The second pressure is 10–20 bar; and / or The time for the delayed motor to be de-energized is 1ms to 2s.

5. The method according to claim 1, characterized in that: The test of the suspension air supply module according to the control command includes a front axle closed descent test: the solenoid valves of the air tank and the front axle bladder are opened, the motor is controlled to reduce the pressure in the variable volume load of FL and FR to the target value, simulating the front axle descent condition of a real vehicle, the variable volume capacity is automatically adjusted through the motor force feedback mode to simulate the height feedback of a real vehicle, and the height signal is transmitted to the product ECU to read the test data.

6. The method according to any one of claims 1 to 5, characterized in that: The data to be read includes at least one of the following: current, voltage, pressure, flow rate, CDC stiffness valve output status, and time.

7. The method according to any one of claims 1 to 5, characterized in that: The variable volume load includes: a volume-adjustable piston cylinder assembly, a servo motor linked to the cylinder, a high-precision displacement sensor, and / or a temperature-compensated pressure transmitter.

8. The method according to any one of claims 1 to 5, characterized in that, The gas path switching includes: using binary coding to combine and control 12 gas control valves, setting a gas path status self-test program to verify the integrity of the path, and / or configuring an emergency exhaust channel to achieve rapid pressure relief.

9. The method according to any one of claims 1 to 5, characterized in that: It also includes: plotting data curves based on the read test data to determine the performance indicators of each test item.

Images