Research On Driving Control Of Electric Vehicle Based On Output Torque

The application of traditional automobile is more and more, and following with lots ofenergy shortage and environmental pollution problems, as a kind of new energy vehicles,electric vehicle is able to reduce emission and environmental pollution. Therefore, it hasbecome the important direction of auto industry. At present, there are multiple key technologyand difficult problems to solve in development process of electric vehicle, the motor drive andits control technology is one of the key problems to be solved.Based on the analysis of the electric vehicle drive system, we proposed that use thein-wheel motor drive style based on the BLDCM. And the whole vehicle is divided into start,driving, acceleration climbing, deceleration braking, then based on the different workingconditions and driving demand, we analysis the vehicle control and driving torque controlstrategy. According to driving cycle of vehicle, this paper research on torque performance ofthe electric vehicle driver control and various working conditions, and established theco-simulation model with Matlab/Simulink and advisor for the pure electric vehicle. We putforward the BLDCM speed control system which is combination the outer loop fuzzy PIDcontrol and current inner loop PI control. When the motor overloading coefficient is1.0or2.0,make simulation for the climbing and accelerating situation; the simulation has shown that, thebigger the motor overloading coefficient, the more performance of climbing and accelerating,and improve the performance of electric vehicle drive system. The results verify the feasibilityof fuzzy PID control for BLDCM, and it has certain reference value for the research on electricvehicle.This paper use dsPIC30F2010digital signal controller as the core, and write software forthe electronic control unit, then use modular design method to design the related softwaremodules such as the main program module, terminal program module, meanwhile make briefanalysis of software function. The dsPIC30F2010is appropriate for closed-loop controllingBLDCM which is carry with sensors.Finally, this paper put up the drive motor simulation test, put the motor and its controlleron the test platform for dynamic debugging.The test results show that the pure electric vehiclebased on the BLDCM torque control has good performance. For the two-wheeled pure electriccar, the BLDCM control system has good control performance and reliable operation.