introduction This article refers to the address: http:// The automobile power steering system has experienced the stages of mechanical power steering, hydraulic power steering, and electronically controlled hydraulic power steering. At present, electric power steering system (EPS) is one of the hot topics in the field of automotive engineering. The main content of the research is the control rules of the EPS system and the design of the hardware controller. The electric power steering system has the characteristics of few components, simple structure, easy installation and maintenance, etc. It is realized by the motor control torque mechanism to realize the power steering. The EPS control system can adjust and control the motor's assist (or damping) state according to the road conditions and vehicle conditions, greatly improving the steering comfort of the driving. LabVIEW has a good application prospect in the field of automotive electronics because of its outstanding advantages. EPS composition and working principle Electric power steering is to add a motor as a power source based on the artificial mechanical system, and replace the hydraulic power steering with electric power. Electric power is controlled by the electrical control of the motor to control the motor. In order to analyze the quality of the motor drive system, And to check the working condition of the system, there must be a system test tool to reflect the working state of the system. The virtual test system based on LabVIEW can complete the comprehensive monitoring of the electric power steering system. This is also the ultimate goal of this research. The LabVIEW-based automotive electric power steering system is mainly composed of the following components (see Figure 1): electronic control unit (ECU), vehicle speed sensor and torque sensor, servo motor, speed reduction mechanism and steering column assembly, program port and computer, etc. . The key ones are the electronic control unit, the signal acquisition and conditioning circuit and the computer virtual instrument, which largely determine the control effect of the electric power steering system. The operation process of the EPS system is: when the car is in the starting or low-speed driving state, the steering wheel is turned, the torque sensor mounted on the steering column continuously detects the torque acting on the steering column torsion bar, and the signal is input simultaneously with the vehicle speed signal. The electronic controller and the signal acquisition and conditioning circuit, the ECU processor performs arithmetic processing on the input signal to determine the magnitude and direction of the assist torque, thereby controlling the current and steering of the motor, and the motor transmits the torque to the traction front wheel through the clutch and the speed reduction mechanism. The tie rods ultimately provide the driver with an auxiliary steering force. At the same time, the torque signal T and the current signal I are signal-conditioned and then input into the LabVIEW virtual instrument control program of the computer through RS-232 serial communication mode to perform comprehensive system performance test. Figure 1 Schematic diagram of the structure of the car power steering system system design Program module diagram The automotive power steering system is mainly divided into three modules: an input signal acquisition module, an electronic control unit ECU module, and an output actuator module (see Figure 2). Figure 2 Design block diagram of the vehicle power steering system The system uses a self-made basic input and output system to simulate an electric power steering device (EPS). The vehicle speed is simulated by a pulse generated by a basic input/output system. The pulse frequency can be simulated by a potentiometer fixed on the accelerator pedal. adjust. When the vehicle speed is relatively fast, the frequency of the pulse is large; when the vehicle speed is relatively slow, the frequency of the pulse is small. The inputs to the other sensors are simulated with the output voltage of the basic input and output system, which can be adjusted by a potentiometer. System flow chart The system is designed based on LabVIEW. The main run sequence and loop structure are composed of while, case and other structures in LabVIEW programming. The specific program flow chart is shown in Figure 3. Figure 3 Program flow chart of the vehicle power steering system 2.3 System interface: divided into four parts: main interface, system establishment, parameter setting, performance test, etc., as shown in Figure 4. When the main interface is running, the user will log in and register the user information, as shown in Figure 5; then enter the system establishment, including the model of the car, etc.; then the test data settings, including the sampling frequency, vehicle speed, torque Current and voltage alarm upper limit, display format. Figure 4 LabVIEW-based automotive power steering system test main interface Figure 5 LabVIEW-based vehicle power steering system program login interface Conclusion This paper applies sensor technology, computer control technology and virtual instrument technology to research and develop a virtual test system for automotive electric power steering performance based on LabVIEW. The system has friendly man-machine interface, stable and reliable operation, and its use greatly shortens test time and improves work. Efficiency can meet the requirements of modern production testing.
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