Study On Control Strategy Of Extended Range Electric Vehicle Based On Methanol Fuel

The Extended-range Electric Vehicle(EREV)has an independent Auxiliary Power Unit(APU),Which can recharge the vehicle's power battery When it arrives at the charging station with lower battery energy.When evaluating the performance of EREV,two factors have a crucial impact on the performance of the vehicle.One is the choice of range extender.The performance of the APU directly determines the efficiency and economic characteristics of the EREV.The other is the rationality of the control strategy.Different control strategies are essentially different energy flow distribution methods during the driving of EREV.To explore the problems above,some research on the selection of APU and control strategies,has been carried out.1.In this paper,a methanol fueled engine is selected.The vehicle simulation model was built in MATLAB / SIMULINK environment.Existing data was applied to the construction of the engine model.After completing the above work,selection and matching of vehicle power components was completed.In order to explore the efficiency characteristics of the APU,the oil-electric conversion efficiency of the APU is introduced as one of the evaluation indexes.In the simulation process,the working efficiency and cumulative fuel consumption of the vehicle can be obtained through realtime calculation.2.In order to further optimize the performance of EREV,the vehicle control system architecture is designed from the perspective of energy management.By identifying the start and stop status of the vehicle,an intelligent parking charging strategy is designed.The working mode of the APU is analyzed,and the fuzzy logic is used to realize the coordinated control of the APU.3.Comparing the performance of EREV under different fuels: complete the thermostat control strategy and power follow-up control strategy by finding the best operating point of the range extender.A multi-mode control strategy is established by finding the optimal working curve of the range extender.The performance of methanol fuel EREV and gasoline fuel EREV was analyzed under each strategy.4.Comparing the performance of EREV under different strategies: Combining with cycle conditions,starting from battery SOC and range extender operating conditions,comparing and analyzing the performance of methanol fuel under various strategies.The conclusions are as follows: From different fuel perspectives,methanol fuel EREV performs better than gasoline fuel EREV in various control strategies.Under NEDC conditions,compared with gasoline fuel EREV,fuel economy has been improved by 9.56%,19.15%,and 11.51% under the thermostat strategy,power following strategy,and multi-mode strategy,respectively.From a strategic perspective,methanol fuel EREV performs best using a multi-mode control strategy,Which improves fuel economy by 2.6% compared to a thermostat strategy and 2.25% fuel economy compared to a power following strategy.