Engine Calibration Test And Research On Energy Management Strategy Of Parallel Plug-in Hybrid Power System

With the increasingly strict emission regulations and fuel consumption regulations caused by the energy crisis and environmental pollution problems,plug-in hybrid vehicles have become an excessive research hotspot.Because it has two kinds of power sources and has the ability to directly obtain electric power from the grid,the plug-in hybrid vehicle can not only have better economy and emission than the hybrid vehicle,but also solve the problem of insufficient energy storage and short cruising range problems of electric vehicles.However,because the plug-in hybrid vehicle has different working conditions due to different working conditions,the reasonable and efficient distribution of demand torque in different working modes has become the primary problem of reducing the energy consumption of the whole vehicle.The reasonable energy management strategy is to make the engine,motor and power battery work in the high efficiency range as much as possible under the premise of satisfying the vehicle’s power,so that the whole vehicle has the highest operating efficiency.Based on the school-enterprise cooperation project ‘A Hybrid Power System Development Test’,this project studies the energy management strategy of a P2 configuration parallel plugin hybrid system for a pickup truck.The main work of the thesis is:The target engine selected for the hybrid system is subjected to independent development platform control calibration.After calibration,the maximum output torque of the engine is 228 Nm,the minimum fuel consumption rate is 235g/kWh,the fuel economy area is 1500~3000rpm and the load is 80~150Nm.According to the performance parameters of each component selected by the project,through the theoretical analysis,the forward simulation model of the modular PHEV hybrid system based on test data was built in Matlab/Simulink.The vehicle speed following simulation test results show that the built simulation platform can be used for control strategy development.Based on the Charge Depleting mode and Charge Sustaining mode in Matlab/Simulink,an energy management system based on logic threshold and an energy management system based on fuzzy rules are designed for the working characteristics of plug-in hybrid system.Both strategies only start the engine during the Charge Sustaining mode.Simulation verification was carried out under NEDC cycle conditions and WLTC cycle conditions.The simulation results show that under the NEDC cycle condition,both the fuzzy control strategy and the logic threshold control strategy have better SOC control effects,but the fuzzy control strategy has significant fuel-saving effect and saves fuel.Under WLTC cycle conditions,the SOC control effect of the fuzzy control strategy is better than the logic threshold control strategy.The energy management strategy based on fuzzy rules has better fuel consumption performance than the energy management strategy based on logic threshold,and 100-kilometer fuel consumption of the fuzzy control strategy is about 10% lower than the logic threshold control strategy...