Hardware In The Loop Simulation Of Vehicle AMT Electronic Control Unit

Equipped with automatic transmission of the vehicle can effectively reduce the labor intensity of the driver,out of the safety requirements for the vehicle,automatically shift vehicle become the development trend of the automotive industry.Automatic mechanical transmission(AMT)has the advantages of simple conversion,high transmission efficiency and low assembly cost,and is widely concerned in the field of automatic transmission.However,the actual situation of the vehicle is complicated and changeable.Only depends on the bench test and the road test for the development of AMT products will consume a lot of manpower,material and financial resources.The imperfect function of the pre-software will not only cause repeated loading test but also exist safety risk.Combining hardware in the loop simulation technology technology to develop AMT products,by computer simulation of the running state of the vehicle,test electronic control unit software functions,verify and improve the control strategy,which can effectively save development costs,ensure product quality and shorten the development cycle.Therefore,the use of hardware-in-the-loop simulation of AMT product development has practical significance.Based on the TCU hardware developed by the research room,the hardware in-the-loop simulation of TCU is realized on xPC dual computer system,which verifies the validity of AMT product control logic.First of all,analysis several of commonly used hardware in the loop simulation platform,according to the cost needs,choose x PC hardware-in-the-loop platform,improve the platform for the controller needs and details of the xPC dual computer system and build the platform.Secondly,assuming that the car is running on the straight road and ignoring the influence of the elastic damping,analysis mathematical of the engine part,the transmission part and the body part.According to the Kirchhoff law,the shifting actuating mechanism of transfer function is deduced.According to the mathematical analysis,the engine model,the transmission system model and the vehicle body model are built by using the MATLAB / Simulink software.Because the motor parameters are unknown,the parameters of the system transfer function are systematically identified and selected by the actual input and output of the selector motor and shift motor and actuator simulation model,build CAN communication model and perform off-line simulation.Using the Lab VIEW software to design the monitoring interface,call the library function node module to call the API function to monitor the running state of the vehicle model running in the target real-time environment and control the throttle opening degree,and collect the PWM signal of the motor drive output and convert it into continuous of the voltage signal as the input of the motor model.Finally,through the study of the excellent driver shift rule,the lifting and lowering points of different accelerators in the fixed position are plotted as interpolation rules,using the look-up table method to achieve shift logic based on the corresponding software design.Using position,speed double closed-loop PID control algorithm to achieve the shift motor control.Integrated shift logic and control strategy,through the xPC hardware in the loop simulation platform to achieve AMT electronic control unit automatic shift function.