The Design & Research Of Real Time Dual Motor Dual Drive Shaft Electric Vehicle Control System

Recently,energy crisis and environmental pollution are becoming more and more bad.The emergency of auto industry to develop new type of energy saving,environment friendly vehicle is imminent.Pure Electric Vehicle(PEV)has become the development trend of the industry future,owing the advantages like zero emission and high efficiency.Among all types of PEVs,the Dual Motor deployment method that has good power performance and fuel economics is becoming a new hot spot in the pure electric vehicles research field.Based on the key scientific research project of Shandong province,the control systems for timely two-axis double motor drive electric vehicle were studied in this essay.(1)In order to improve the bandwidth utilization and real-time performance of Dual Motor Dual Drive Axis electric vehicle CAN communication network,a TTCAN hybrid scheduling policy was put forward considering the characteristic that sporadic and periodical message coexist in the same network.(2)Taking the messages in various nodes of the power train control system within the Dual Motor Dual Drive Axis electric vehicle as the research objects,a scheduling strategy of messages in the network was designed and optimized according to its period and importance.(3)In CANoe software,simulation models are founded according to its characteristic and Finally,the scheduling strategy is validated on the CAN network hardware validation platform,the results show that TTCAN scheduling policy significantly improved the bandwidth utilization and randomness of real-time performance,comparing to common CAN network.(4)Models such as batteries and drive system are established in Simulink environment according to the principle and characteristics of controlled object.Based on the Models,strategies are proposed on the basis of established models like the high-low voltage electrical switch,limp drive and torque allocation strategy.(5)Taking the function correctness of the vehicle controller logic as the test target,a functionality test plan based on Veristand relates to models and a automatic test plan based on TestStand are proposed for the VCU on HIL platform.(6)Test steps are also given in details meeting the test requirements.The final results shows that the function of the control strategy and control demands of the vehicle needs for vehicle are complete realized.