Research And Development Of Electric Power Steering System Controller Based On V Mode

Electric power steering system(EPS)has been widely used for its energy saving,environmental protection,high efficiency and good sense of "road sense".Electronic control unit(ECU)is a key component of EPS and has a direct impact on EPS performance.In the process of developing EPS,ECU development is extremely important.The traditional ECU development model has revealed the defects of its long period and low efficiency,which can not meet the needs of the rapid development of the automobile industry.The V mode is widely used in the industry for ECU development.Therefore,the paper mainly develops the EPS controller based on V mode.The main research contents are divided into the following parts:(1)Using the MATLAB/Simscape module to establish EPS physical model;The fuzzy controller designed to power the target current is designed,and the power curve is obtained through the controller.The control strategy based on PID control and fuzzy PID control is adopted to control the control based on PID control.(2)In this paper,a complete vehicle model and EPS model of Dynacar are used to simulate the simulation.The simulation platform is based on the simulation of the simulation platform.The results showed that the average steering torque of the steering wheel decreased by 21 percent compared with the unadded EPS control,which eliminated the phenomenon of insufficient return.(3)Selecting PXI device NI company for the construction of the EPS system hardware in loop test platform,the platform is mainly divided into three aspects:development of EPS controller based on MotoTron platform,hardware selection and software design.Based on the platform to portable test and back to the positive test,the test results show that:compared with the EPS control not to join,to average to manipulate the steering wheel torque at low speed reduced by 51%,basically eliminated the phenomenon of back is insufficient and prove that the development of EPS controller has the advantages of good,back to the positive operation of the light.(4)Steering wheel,sensor,power of EPS motor,servo drive and servo motor selection of key parts,such as using MotoTron software of sensor calibration experiment was carried out to get its output characteristic diagram,completed the construction of the EPS test-bed.Back at low speed are tested using this platform,the experimental results show that compared with not to join the EPS control,the steering wheel and stable time reduced by 50.5%,the steering wheel Angle decreased by 55.6%,basic elimination of the phenomenon of returning to the positive.