Active suspension system signal isolation and acquisition and health state detection tool

Abstract

The invention belongs to the technical field of vehicle engineering, and particularly relates to an active suspension system signal isolation and acquisition and health state detection tool which comprises a voltage isolation module, a current isolation module, a current clamp, a signal acquisition device, a display control terminal, a memory card and a card reader. The detection tool is used for collecting and detecting output signals of a sensor of the active suspension control system and bus information of a motor driver and a suspension controller so as to monitor working states of the sensor, the controller and the motor driver. According to the detection tool, a sensor signal of the active suspension system is connected to the controller, and the signal is synchronously output to the signal acquisition module for signal acquisition. And on the other hand, the controller and the signal acquisition module are ensured to synchronously acquire pressure, acceleration, angle, motor current and other sensors and a bus system and perform system health state diagnosis and analysis.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle engineering, and particularly relates to a signal isolation, acquisition and health state detection tool for an active suspension system. BACKGROUND

[0002] The active suspension system is used to replace the elastic unit and the damping device, has a large adjustment bandwidth, automatically and real-timely changes the active output force according to the changes of external conditions and environment, and maximally guarantees the ride comfort and driving safety of the automobile. In recent years, the rapid development of sensor, control processor and actuator technologies provides technical support for the application and popularization of the active suspension system. The performance of the active suspension system is greatly determined by the control system hardware and the control strategy.

[0003] The passive suspension system is simple, has no control electrical system, is high in reliability, long in service life and strong in maintainability; but the active suspension system is complex, involves multiple fields of hydraulic pressure, electrical control and machinery, is low in reliability and complex in maintenance steps. Therefore, a special detection tool needs to be developed for the active suspension system, which requires that the tool does not affect the normal work of the active suspension system and on the other hand, the tool needs to detect and manage the state of the active suspension system in real time. SUMMARY

[0004] (I) Technical problem to be solved

[0005] The technical problem to be solved by the application is how to design a signal isolation, acquisition and health state detection tool for an active suspension system, which does not affect the normal work of the active suspension control system, detects and manages the health state of the system on one hand, and stores real-time signals on the other hand.

[0006] (II) Technical scheme

[0007] To solve the above technical problem, the application provides a signal isolation, acquisition and health state detection tool for an active suspension system, which comprises a voltage isolation module, a current isolation module, a current clamp, a signal acquisition device, a display and control terminal, a storage card and a card reader.

[0008] The voltage isolation module is used to isolate the 0-5V voltage signals of the angle sensor, the acceleration sensor and the pressure sensor on each suspension and the 0-5V voltage signals of the pressure sensor of the hydraulic system, and then output 1 / 2; the input of the voltage isolation module is a 2-way 0-5V voltage analog signal, the output is a 4-way 0-5V voltage analog signal, the precision is 0.1% FS, the response time is 5-10 ms, one way is input to the active suspension controller, and one way is input to the signal acquisition module.

[0009] The current isolation module is used for converting 4-way servo valve current after current isolation into 0-5V voltage and outputting to the signal acquisition module, the current acquisition module is designed as 1-in and 1-out, the input current is -50mA-+50mA, the output voltage signal is 0-5V, the precision is 0.1% FS, and the current signal isolation conversion is completed;

[0010] The current clamp is used for acquiring DC current of the suspension motor, the DC current measurement range is 0-200A, the acquired current is converted into 0-5V output voltage, the linearity and accuracy are 0.5%, and the output is output to the signal acquisition module, so that the current condition of the motor and the power of the motor are detected by the display control terminal;

[0011] The signal acquisition module is used for acquiring voltage signals output by the voltage isolation module, the current isolation module and the current clamp, and is also used for acquiring analog voltage signals, CAN and Flexray bus information, and then transmitting the acquired signals to the display control terminal, so that the display control terminal receives various sensor signals, serial ports or bus information, and is used for analyzing the working states of various sensors, motors and hydraulic systems;

[0012] The signal acquisition module is provided with an offline storage device, various sensor information and bus information are stored offline in real time by plugging in a storage card, when information analysis is needed, the storage card is pulled out, and data reading is performed by using a card reader;

[0013] The display control terminal is used for health detection state management of the active suspension system hardware, and the hardware of the display control terminal is provided with a debugging port and a program download port, so that the display control interface and the underlying drive of the display control terminal can be changed;

[0014] The storage card and the card reader are used for completing storage and transfer of the collected data, so as to facilitate system state information analysis in the later period.

[0015] The voltage isolation module is designed as 2-in and 4-out, and is used for completing isolation output of the voltage signal.

[0016] The current isolation module is used for ensuring that the output signals do not interfere with each other and are synchronous.

[0017] The display control terminal is used for judging whether the pressure, oil source liquid level and motor speed of the active suspension system are normal, and whether various sensors and servo valves are normal.

[0018] The various sensors include a pressure sensor, a liquid level temperature sensor, an acceleration sensor and an angle sensor.

[0019] The display control terminal is used for managing the hardware detection state of the active suspension system, and is used for displaying the pressure sensor on each actuator, the acceleration sensor, the angle sensor on the balance elbow, the control current of the servo valve, the switch state of the hydraulic system electromagnetic valve, the suspension motor current, the motor speed, the motor enable state, and the values of the high and low pressure sensors of the hydraulic system and the oil tank liquid level temperature sensor in real time.

[0020] The neural network algorithm is used to analyze the data of each sensor, the hydraulic system and the motor, and diagnose the health state of the active suspension system.

[0021] The display control terminal includes a fault diagnosis database module, which stores prior data information, historical data of diagnosis results after diagnosis, and a trained health diagnosis model, and is used for finding historical health information and diagnosis results, thereby providing a communication platform between real-time fault information and the health diagnosis module.

[0022] The health diagnosis module trains the neural network algorithm according to the historical data in the fault diagnosis database module, and saves it in the trained health diagnosis model.

[0023] The display control terminal realizes corresponding functions through the controls on the interface thereof, and displays corresponding results on the interface for the operator to perform health state diagnosis and analysis of the active suspension system.

[0024] The display control terminal has a debugging port and a program download port, which are used for changing the display control interface and the underlying driving software of the display control terminal.

[0025] The software overall architecture of the display control terminal includes a data acquisition management module, a model management module, and a health diagnosis module.

[0026] The data acquisition management module is used for: (1) data acquisition, storage and preprocessing; (2) graphical dynamic display of data, and selection of time-frequency domain waveform display of data.

[0027] The module management module is used for: (1) model training function: obtaining a health diagnosis model by using a model constructed by data training, (2) model construction function: modifying and combining parameters of a basic model to form a reasonable model structure, and (3) model saving function: saving the trained health diagnosis model to provide subsequent model training and health diagnosis.

[0028] The health diagnosis module is used for: (1) health diagnosis function: multiple model health diagnosis of active suspension data in different scenes, (2) data saving function: supporting data export as word format fault diagnosis result, (3) dynamic display function: generating result graphical dynamic display of health state data, and the user selects to draw the result data, (4) data refining function: extracting data according to a neural network algorithm to generate behavior description data.

[0029] The detection tool can realize real-time signal acquisition and health state detection management functions of the active suspension.

[0030] The detection tool can realize real-time signal acquisition and health state detection management functions of the active suspension.

[0031] (Three) beneficial effects

[0032] Compared with the prior art, the active suspension signal isolation and acquisition state detection tool provided by the present application can realize real-time signal acquisition and health state detection management functions of the active suspension. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The figure is a structural component schematic diagram of the present application;

[0034] Figure 2 The figure is a general framework of the display control terminal software;

[0035] Figure 3 The figure is a health state diagnosis scheme design architecture diagram.

[0036] Figure 4 The figure is a data reading and visualization interface schematic diagram. DETAILED DESCRIPTION

[0037] In order to make the purpose, content, and advantages of the present application clearer, the specific embodiments of the present application are described in further detail below in combination with the drawings and examples.

[0038] To solve the above technical problems, the present application provides a kind of active suspension system signal isolation and acquisition and health state detection tool, as shown in Figure 1 The detection tool includes: cable electrical connector, power switch, voltage isolation module, current isolation module, current clamp, signal acquisition device, display control terminal, oscilloscope, memory card and card reader;

[0039] The voltage isolation module is used for isolating 0-5V voltage signals of each angle sensor, acceleration sensor, pressure sensor and pressure sensor of the hydraulic system and then performing 1 / 2 output; the input of the voltage isolation module is 2-way 0-5V voltage analog signals, the output is 4-way 0-5V voltage analog signals, the precision is 0.1% FS, the response time is 5-10 ms, one way is input to the active suspension controller, and one way is input to the signal acquisition module.

[0040] The current isolation module is used for converting 4-way servo valve currents into 0-5V voltage after isolation and then outputting to the signal acquisition module, the current acquisition module is designed as 1-in and 1-out, the input current is-50mA-+50mA, the output voltage signal is 0-5V, the precision is 0.1% FS, and the current signal isolation conversion is completed;

[0041] The current clamp is used for acquiring direct current of the suspension motor, the direct current measurement range is 0-200A, the acquired current is converted into 0-5V output voltage, the linearity and accuracy are 0.5%, and the output is to the signal acquisition module, which is used for detecting the current condition of the motor and detecting the power of the motor by the display control terminal;

[0042] The signal acquisition module is used for acquiring voltage signals output by the voltage isolation module, the current isolation module and the current clamp, and is also used for acquiring analog voltage signals, CAN and Flexray bus information, then the acquired signals are transmitted to the display control terminal, the display control terminal receives each way sensor signal, serial port or bus information, and is used for analyzing the working states of each way sensor, motor and hydraulic system;

[0043] The signal acquisition module is provided with an offline storage device, each way sensor information and bus information are stored in real time by plugging in a storage card, when information analysis is needed, the storage card is pulled out, and data reading is performed by using a card reader;

[0044] The display control terminal is used for health detection state management of the active suspension system hardware, the hardware of the display control terminal is provided with a debugging port and a program download port, the display control interface and the bottom layer driving of the display control terminal can be changed;

[0045] The storage card and the card reader are used for completing storage and transfer of the acquired data, and are convenient for system state information analysis in the later period.

[0046] The voltage isolation module is designed as 2-in and 4-out, which is used for completing isolation output of the voltage signal, the isolation module can ensure that the output signals do not interfere with each other and are synchronous.

[0047] The current isolation module is used for ensuring that the output signals do not interfere with each other and are synchronous.

[0048] The display control terminal is configured to determine whether the pressure of the active suspension system, the oil source liquid level, the motor speed, and each sensor and servo valve are normal.

[0049] The sensors include a pressure sensor, a liquid level temperature sensor, an acceleration sensor, and an angle sensor.

[0050] The display control terminal is configured to manage the hardware detection state of the active suspension system, and is configured to display, in real time, the two pressure sensors on each actuator, the acceleration sensor, the angle sensor on the balance elbow, the control current of the servo valve, the on-off state of the hydraulic system electromagnetic valve, the suspension motor current, the motor speed, the motor enable state, and the values of the hydraulic system high and low pressure sensors and the oil tank liquid level temperature sensor.

[0051] The neural network algorithm is used to analyze the data of each sensor, the hydraulic system, and the motor, and to diagnose the health state of the active suspension system.

[0052] The display control terminal includes a fault diagnosis database module, which stores prior data information, historical data of diagnosis results after diagnosis, and a trained health diagnosis model, and is configured to find historical health information and diagnosis results, thereby providing an exchange platform between real-time fault information and the health diagnosis module.

[0053] The health diagnosis module trains the neural network algorithm based on the historical data in the fault diagnosis database module, and saves the trained health diagnosis model.

[0054] The display control terminal realizes corresponding functions through the controls on the interface, and displays the corresponding results on the interface for the operator to diagnose and analyze the health state of the active suspension system.

[0055] The display control terminal has a debugging port and a program download port, which are used to change the display control interface and the underlying driving software of the display control terminal.

[0056] As shown in Figure 2 The software architecture of the display control terminal includes a data acquisition management module, a model management module, and a health diagnosis module. The display control terminal provides a simple fault diagnosis process for users, and is equipped with multiple interfaces to facilitate secondary development and system maintenance by developers. The system mainly detects the health state of the active suspension system, and performs model fusion with multiple algorithm modules, as shown in Figure 3

[0057] The data acquisition management module is configured to: (1) collect, store, and preprocess data; and (2) dynamically display the data in a graphical manner, and select to display the data in the time-frequency domain waveform.​

[0058] The module management module is used for: (1) model training function: training the constructed model with data to obtain a health diagnosis model, (2) model construction function: modifying and combining parameters of a basic model to form a reasonable model structure, and (3) model saving function: saving the trained health diagnosis model to provide subsequent model training and health diagnosis.

[0059] The health diagnosis module is used for: (1) health diagnosis function: performing targeted health diagnosis of the active suspension data in different scenarios by using multiple models, (2) data saving function: supporting data export in the form of a word fault diagnosis result, (3) dynamic display function: generating a graphical dynamic display of the health state data, and allowing a user to select and draw the result data, and (4) data extraction function: extracting data according to a neural network algorithm to generate behavior description data.

[0060] The detection tool does not affect the normal operation of the active suspension control system, and simultaneously completes the suspension information acquisition, and the time delay of the isolation module is about 5 ms, which meets the time delay requirement of the active suspension system.

[0061] The detection tool can realize the functions of real-time signal acquisition and health state detection management of the active suspension.

[0062] Embodiment 1

[0063] The detection tool of this embodiment includes a cable electrical connector, a power switch, a voltage isolation module, a current isolation module, a current clamp, a signal acquisition device, a display and control terminal, an oscilloscope, a storage card and a card reader, as shown in Figure 1 Each signal is synchronously transmitted to the active suspension controller and the signal acquisition device through the active suspension data acquisition conversion box, the signal acquisition device transmits information to the display and control terminal of the health state management, and the terminal software performs health state management.

[0064] The detection tool acquires the voltage output signals (0-5V) of the angle sensor, the acceleration sensor, two-way pressure sensor and one-way servo valve driving signal (-50mA-50mA) on each suspension in real time, the output signals (0-5V) of the two-way pressure sensor and the liquid level temperature sensor of the hydraulic system, and a total of four actuators of the whole vehicle. The direct current of the suspension motor is acquired by the current clamp, and the speed, enable state and temperature information of the motor are acquired by the bus. The system can support offline storage and online storage of data, and offline data can be read and analyzed according to the selected file. Figure 4 For the data reading and visualization interface, the data can be read and displayed in the form of drawing.

[0065] The test takes 6 sensors of acceleration sensor, angle sensor and pressure sensor as an example, and real vehicle test data sample is taken as data sample source for fault diagnosis verification. Data sample distribution is shown in Table 1.

[0066] Table 1 data set sample ratio

[0067]

[0068] The obtained 3500 groups of sensor data samples are input into detection software, and the diagnosis result is shown in Table 2.

[0069] Table 2 health state detection result

[0070]

[0071] The fault diagnosis has good effect, the fault information of the sensor can be found in time, and the health detection performance is high.

[0072] The above only describes the preferred embodiments of the present application, and it should be noted that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. An active suspension system signal isolation and acquisition and health detection tool, characterized in that, The detection tool comprises a voltage isolation module, a current isolation module, a current clamp, a signal acquisition device, a display control terminal, a storage card and a card reader. The voltage isolation module is used for isolating 0-5V voltage signals of each angle sensor, acceleration sensor and pressure sensor on the suspension and a pressure sensor 0-5V voltage signal of the hydraulic system and then performing 1:2 output; the input of the voltage isolation module is 2-way 0-5V voltage analog signals, the output is 4-way 0-5V voltage analog signals, the response time is 5-10 ms, one way is input to the active suspension controller, and one way is input to the signal acquisition module. The current isolation module is used for converting 4-way servo valve currents into 0-5V voltages after isolation and outputting to the signal acquisition module; the current acquisition module is designed as 1-in and 1-out, the input current is -50mA-+50mA, the output voltage signal is 0-5V, and is used for completing current signal isolation conversion. The current clamp is used for acquiring direct current of the suspension motor, the direct current measurement range is 0-200A, the acquired current is converted into 0-5V output voltage, and is output to the signal acquisition module, which is used for detecting the current condition of the motor and the power of the motor by the display control terminal. The signal acquisition module is used for acquiring voltage signals output by the voltage isolation module, the current isolation module and the current clamp, is also used for acquiring analog voltage signals, CAN and Flexray bus information, and then transmits the acquired signals to the display control terminal; the display control terminal receives each way sensor signal, serial port or bus information, and is used for analyzing the working states of each way sensor, motor and hydraulic system. An offline storage device is arranged on the signal acquisition module, each way sensor information and bus information are stored in real time by inserting the storage card, the storage card is pulled out when information analysis is needed, and the data is read by the card reader. The display control terminal is used for health detection state management of the active suspension system hardware; the hardware of the display control terminal is provided with a debugging port and a program download port, and the display control interface and the bottom layer driving of the display control terminal can be changed. The storage card and the card reader are used for completing storage and transfer of the acquired data, and are convenient for system state information analysis in the later period.

2. The active suspension system signal isolation and acquisition and health detection tool of claim 1, wherein, The voltage isolation module is designed as 2-in and 4-out, and is used for completing isolation output of the voltage signal; the isolation module can ensure that the output signals do not interfere with each other and are synchronous.

3. The active suspension system signal isolation and acquisition and health detection tool of claim 1, wherein, The current isolation module is used for ensuring that the output signals do not interfere with each other and are synchronous.

4. The active suspension system signal isolation and acquisition and health detection tool of claim 1, wherein, The display control terminal is used for judging whether the pressure of the active suspension system, the oil source liquid level, the motor speed are normal, and each sensor and servo valve is normal.

5. The active suspension system signal isolation and acquisition and health detection tool of claim 3, wherein, Each sensor comprises a pressure sensor, a liquid level temperature sensor, an acceleration sensor and an angle sensor.

6. The active suspension system signal isolation and acquisition and health detection tool of claim 1, wherein, The display control terminal is used for active suspension system hardware detection state management, and is used for displaying the pressure sensor on each actuator, the acceleration sensor, the angle sensor on the balance elbow, the control current of the servo valve, the switch state of the hydraulic system electromagnetic valve, the suspension motor current, the motor speed, the motor enable state, and the values of the high and low pressure sensors of the hydraulic system and the oil tank liquid level temperature sensor. The neural network algorithm is used to analyze the data of each sensor, hydraulic system and motor, and diagnose the health state of the active suspension system.

7. The active suspension system signal isolation and acquisition and health detection tool of claim 1, wherein, The display control terminal comprises a fault diagnosis database module, wherein the fault diagnosis database module stores prior data information, historical data of diagnosis result reports after diagnosis and a trained health diagnosis model, and is used for searching historical health information and diagnosis results, thereby providing an exchange platform between real-time fault information and the health diagnosis module. The health diagnosis module trains the neural network algorithm according to the historical data in the fault diagnosis database module, and saves the trained health diagnosis model. The display control terminal realizes corresponding functions through the controls on the interface thereof, and displays corresponding results on the interface for the operator to perform health state diagnosis and analysis of the active suspension system.

8. The active suspension system signal isolation and acquisition and health detection tool of claim 7, wherein, The hardware of the display control terminal is provided with a debugging port and a program download port, which are used for changing the display control interface and the underlying driving software of the display control terminal. The software overall architecture of the display control terminal comprises a data acquisition management module, a model management module and a health diagnosis module. The data acquisition management module is used for: (1) data acquisition, storage and preprocessing; (2) graphical dynamic display of the data, and selection of time-frequency domain waveform display of the data. The model management module is used for: (1) model training function: obtaining the health diagnosis model by using the model constructed by training the data, (2) model construction function: parameter modification and combination of the basic model to form a reasonable model structure, and (3) model saving function: saving the trained health diagnosis model to provide subsequent model training and health diagnosis. The health diagnosis module is used for: (1) health diagnosis function: targeted health diagnosis of the active suspension data in different scenarios by using multiple models, (2) data saving function: supporting data export as a word format fault diagnosis result, (3) dynamic display function: graphical dynamic display of the health state data generation result, and user-selected drawing display of the result data, and (4) data extraction function: data extraction according to the neural network algorithm to generate behavior description data.

9. The active suspension system signal isolation and acquisition and health detection tool of claim 1, wherein, The detection tool does not affect the normal work of the active suspension control system, and simultaneously completes the suspension information acquisition, the time delay of the isolation module is about 5 ms, and the time delay requirement of the active suspension system is met.

10. The active suspension system signal isolation and acquisition and health detection tool of claim 1, wherein, The detection tool can realize real-time signal acquisition and health state detection management functions of the active suspension.

Images