Design Of Control System For HEV Power Battery Performance Testing Platform

Electric vehicles, because of its energy efficiency and the benefits of reduce environmental pollution has become the development direction of automotive industry of the 21st century. Power battery is the core of electric vehicles, which performance of has a direct impact on the performance of electric vehicles. There are many countries all around the world have already do lots of research on the power battery of electric vehicle, with the constantly improving of battery performance, the demands of electric vehicle battery testing technology has also increasingly high. In this article, we designed a battery-powered electric vehicle simulation system to simulate the performance of charge and discharge of power battery under actual operating conditions, in order to provide a basis for testing the performance of the power battery.This systems using the temperature and humidity control system to simulate the temperature and humidity changes of electric vehicles surrounding environment; with the vibration testing rig to simulate the actual conditions of various road conditions; using electric vehicle drive system as the power battery charge and discharge platform; with big power motor as the discharge load and charging energy recovery systems of the power battery being measured; using simulated vehicle driving simulation system to obtain the relevant control parameters; power batteries and energy storage batteries are lithium iron phosphate battery cells.System Human-Machine software useing NI's development software labview, using vibration platform to simulate the actual run-time electric vehicle vibration conditions, using temperature control system to simulate the actual run-time ambient temperature of vehicle battery. Design data collection system to measuring power batteries' voltage, loop current, temperature and other data under different shock and vibration environments of different temperatures; host computer and the hardware devices using the RS-485 communications and vehicle CAN-BUS.In this paper, different types of electric vehicle power system was analyzed, while electric cars in the actual process of the battery charge and discharge studies were carried out, and electric vehicles running resistance carried out mathematical modeling to achieve a simulation electric cars to run under the battery charging and discharging of the simulation testing.System Human-Machine software uses NI's LABVIEW software development, including data acquisition module, data filtering module, PID control module, alarm module and save the data analysis module. Host computer through the RS-485 and vehicle CAN achieve the communication with the various hardware devices.