Research On Powertrain Test Platform Of New Energy Electric Vehicle

With the gradual depletion of energy on Earth and the growing problem of environmental pollution,people are increasingly aware of the importance of developing new energy technologies,as well as in the automotive industry.With the continuous improvement of automobile exhaust emission standards in China,research on new energy vehicles are rising in numbers.Limited by the current development of battery technology,ideal clean energy pure electric vehicles have not yet tested by the market.Hybrid electric vehicles are still the first choice to improve vehicle emissions.Metal belt type continuously variable transmission(CVT),with its continuously variable speed ratio,is favored for its matching the engine conditions perfectly.Therefore,plug-in hybrid electric vehicles based on the CVT have great potention in energy-saving emission reduction.Although the research of new energy vehicles is completly on the high speed,but the research progress on the new energy vehicle powertrain test platform is relatively slow.New energy vehicle powertrain test platform generally includes new energy vehicle powertrain,sensors,dynamometers and so on.In this paper,we performed parameter matching and established the dynamic model for vehicle powertrain components,such as engine,ISG motor,power battery and CVT,based on basic parameters and main performance indicators of the vehicle.The sensor is also a very important part of the test platform.A photoelectric type torque sensor based on Kalman filter is proposed for more efficient when using the test platform.The sensor can output torque and speed in the same time.We established the mathematical model of the measurement principle for the sensor in this paper.And took into account possible problems during the measurement process,we performed the data correction.In order to make the sample data more accurate and reliable,this paper also carried out Kalman filtering on the sampled data.In terms of electronic control in photoelectric torque sensor,we designed the circuit schematics and circuit plate using Freescale microcontroller chip MPC5634M,and produce the sample circuit boards.We designed electronic control software for the photoelectric torque sensor using CLOUD PLUS automatic code generation platform,and tested the sample photoelectric torque sensor successfully.Performance of vehicle powertrain system was tested by rotary test bench generally.This paper designed a test platform mainly for plug-in hybrid electric vehicle powertrain base on CVT.The platform outputs the vehicle running resistance,which was equivalent to the transmission output shaft,using a motor dynamometer instead of rotary test bench,to test the power transmission performance of the vehicle.After analyzing the principle of powertrain system mode switching in plug-in hybrid electric vehicle based on CVT,three sets of mode switching experiments were carried out on the platform.The results of the experiments shown that they are effective.