A Test Platform For The Pure Electric Vehicle Power System

The fossil energy reserve is limited and the air pollution can be caused in the process of using fossil energy.Meanwhile,the pure electric vehicle is not only excellent in performance,but also characterized by no pollution.These factors have prompted governments to continue to promote the development of the pure electric vehicle related technologies.For the development of the pure electric vehicle,the breakthrough of its power system is the key.Therefore,the experimental platform for the research and development of the power system of the pure electric vehicle is essential to the development of the pure electric vehicle.This dissertation makes an in-depth analysis of the power system of the pure electric vehicle,and a comprehensive study of the laboratory platform.A pure electric vehicle model is built in ADVISOR.The pure electric vehicle model is tested by the UDDS.The data of the driving motor’s power,battery’s efficiency and the operating error display the control strategy of the driving motor controller can drive motor to meet the driving standard conditions and the energy source utilization efficiency is more than 90%.The electric tool vehicle is taken as the research object,and the motor to the towing indoor experimental platform is adopted,a DC power dynamometer is used to simulate the load resistance of the vehicle during the driving process.The DC brushless motor is selected as the driving motor,and the power system of the drive motor is composed of the lithium iron phosphate battery and the DC/DC converter.Two independent controllers are used to control the operation of the driving motor and the dynamometer respectively.In addition,LabVIEW software is used to write the upper computer control system.The upper computer control system communicates with the control cabinet of the dynamometer through RS232 and RS485 serial bus,which is used to obtain experimental data and send control instructions respectively.The upper monitor control system adopts the method of "upper monitor-PCI-1716 acquisition card-driving motor controller" to transmit The driver analog signal from the upper monitor control system to the driving motor controller.The control sub program controls the driving motor’s no-load operation,and the experimental error data shows that the signal transmission mode controls the driving motor’s following the target conditions,and the error is less than 0.026m/s.After the debugging of upper monitor control system,the actual test object istested in order of the accelerate test,the climbing test,the feedback braking test and the continuous condition test.The experimental data of the driving motor and the energy source display that the power system experimental platform for the pure electric vehicle can make accurate acceleration,climbing and braking feedback test,and achieve more close to the actual running state of the continuous running test.