Research On Power Level Hardware-in-the-loop Test System Of Hybrid Electric Vehicle

With the increasing problem of energy shortage and environmental pollution,new energy vehicles have become the main development direction of the automotive industry.In the new energy vehicles,hybrid electric vehicle has the advantages of long range and low fuel consumption,which is a hot research and development direction at home and abroad in recent years.The control strategy of hybrid electric vehicle is an important guarantee for the safe and efficient operation of vehicle.Hardware-in-the-Loop test,as an important part of the development process of control strategy for hybrid electric vehicle,can shorten the development time of control strategy and improve the performance of vehicle control strategy.In this paper,a domestic hybrid passenger vehicle is taken as the research object,the Hardware-in-the-Loop test system is studied,and the power level Hardware-in-the-Loop test system of hybrid passenger vehicle is developed.The research work of this paper has certain engineering significance to improve the control level of hybrid electric vehicle.This paper analyzes the structural characteristics of hybrid electric passenger vehicle and the test requirements of control strategy,and designs the overall scheme of Hardware-in-the-Loop test system.The hardware system and software system of the power level Hardware-in-the-Loop test system are developed.In the aspect of hardware system,the current detection module of proportional solenoid valve is developed to realize the current detection of proportional solenoid valve.The DBC database of CAN communication is developed by NI XNET editor and vector CANdb++.The can communication interface of Hardware-in-the-Loop test system is developed based on DBC database and NI PXI can communication module.Based on NI PXI multi-function I/O hardware module and NI PXI analog output hardware module,the signal interface of current acquisition and sensor model are developed.In the aspect of software system,the powertrain model of hybrid passenger vehicle is built based on AMESim software.Based on MATLAB/Simulink,a shift control strategy model based on synchronizer action is developed.Based on MATLAB/Simulink and ecucoder software,the underlying signal interface software of proportional solenoid valve driving signal,CAN signal and analog signal in rapid prototyping controller is developed.In order to realize the function of monitoring and operating the Hardware-in-the-Loop test system,the human-computer interface software is developed by using veristand UI manager.The experimental scheme of power level hardware in the loop test system is designed.The current detection function of proportional solenoid valve and CAN signal communication function of Hardware-in-the-Loop test system are tested.Through the Hardware-in-the-Loop test system of the power level,the Hardware-in-the-Loop test of the shift control strategy is completed.The dither characteristics of proportional solenoid valve in power level Hardware-in-the-Loop test system are studied experimentally.The results show that the higher the PWM control frequency,the higher the control accuracy of proportional solenoid valve.The dynamic response characteristics of proportional solenoid valve at high PWM frequency are tested by using the control methods of no flutter signal and superimposed flutter signal.The results show that the dynamic response speed of the proportional solenoid valve at high frequency is increased by about 40% when using the control method of superimposed flutter signal.The test automation program of control strategy of hybrid electric passenger vehicle is developed by using NI veristand software,and the automatic Hardware-in-the-Loop test experiment is carried out.The results show that the test automation program realizes the function of test automation and improves the efficiency of Hardware-in-the-Loop test.