Design Of Embedded Power Control System For Smart Car

New energy vehicles represent the development trend of vehicle electrification and intelligence.The four-wheel hub motor independently driven vehicle scheme has a simple transmission mechanism and a higher degree of controllable freedom,and its power system has always been a hot research topic.This paper takes the electric vehicle independently driven by four-wheel hub motors as the research object,and conducts research on the design of the vehicle power system scheme and the power system domain controller platform.The main research contents are as follows.The main research work is as follows:(1)Establish a power system simulation calculation model for electric vehicles to analyze their power performance indicators,mainly including analyzing the requirements of the vehicle’s power drive system for drive torque,motor speed,and total power drive power,and use the analyzed demand results to match the entire vehicle Drive the motor torque,speed,power and other indicators to verify whether the results of the indicator analysis meet the power performance requirements.(2)According to the requirement analysis results of power drive system,the software and hardware platform of vehicle power control system is designed by using embedded system.The hardware system includes the parameter matching and selection of in-wheelmotor,the motor controller and brake;in the design of power control system software platform,combined with the idea of software layered design,the hardware,driver,kernel and task are layered in turn to achieve the purpose of loose coupling design,and the embedded kernel arm is embedded in the hardware layer The micro controller of Cortex-M4 is combined with the real-time operating system u C/OS-III and CAN-bus to design a software framework to meet the performance of stability and real-time requirements of the power control software system.(3)The rationality of the embedded power control system design is verified in both offline and online forms.Offline verification is the correctness of the software system’s pressure-bearing capacity for CAN communication data and the correctness of the parameters transmitted at all levels of the software;online verification is based on hardware selection.After the model is built,the completed vehicle 1/4 chassis structure is combined with the software system to verify the stability and real-time performance of the embedded power control system.