The Matching Optimization of Start-Stop Strategies in Gasoline Range-Extender
The failure mode of flywheel crack in a range-extended electric vehicle was reproduced by frequent starting test in the test bench of laboratory.Both the actual test and calculation results of the flywheel stress and the shaft system vibration situation can explain the reason of flywheel's crack.During the starting stage,the phase difference between the primary and secondary fly-wheels reached the limit value due to the impact on the flywheel,because the resonance speed of shaft system stays time too long,and the engine combustion excitation intensifies the vibration of shaft system.By optimizing the start strategies to avoid range extender working in the resonance speed,and then the flywheel stress was effectively reduced.By optimizing the stopping strategy,the range-extender realizes the fast shutdown.This strategy can improve the NVH performance during the shutdown process,and reduc-es the vibration of the shaft system.The optimized start-stop strategies have been verified by 50000 times start-stop test on range-ex-tender bench and 30000km road durability test of the vehicle.After disassembly,it shows that the flywheel is in good condition.
万方数据
维普
