| The automobile industry pushes forward the development of economy andsociety, but meanwhile, it also brings the energy crisis and environmental problems.Thus, it is high time to develop new energy vehicles. Because of hybrid vehicles’lower emissions and lower energy consumption, both the state and automobileenterprises are making great efforts to promote the plug-in hybrid bus. As one of thecore technology of hybrid bus, performance matching has been always the researchfocus.Single axis parallel plug-in hybrid bus was the research object, and the method ofhybrid bus propulsion system parameters matching was researched. The main factor,influencing economy performance, was found through simulation, and thecorresponding key parameters were improved. The main research works were asfollows:（1）Hybrid bus propulsion system parameters matching method, comprehensivelyconsidering driving cycles，the overall vehicle control strategy, and dynamic andeconomic performance indexes，was proposed. And the key parameters of thepowertrain, including engine，motor, battery, transmission, and the main reducer, werematched.（2）According to overall vehicle control strategy and powertrain parametersmatching, the vehicle simulation model，including bus’ dynamic and economicperformance model, powertrain model, overall vehicle control strategy model, wasestablished. Performance simulation of the single axis parallel plug-in hybrid bus wasdone，and the rationality of the proposed matching method was proved.（3）The most important factor for rate of fuel saving, engine’s work efficiency，was found through simulation. And the three key parameters, including minimumtorque coefficient femim charge-discharge torque proportion coefficient fchg, the limitedpure electric speed neie, which influenced engine’s work efficiency，were improvedthrough simulation. With no improvement，femin valued0.35，fchg0.25，neie700r.min-1.After improvement, femin valued0.4, fchg0.2，and neh1100"rmin-1. The simulationresults showed that the demands of design indexes in overall vehicle’s dynamicperformance were still satisfied, and oil-saving rate, compared with no improvement,was further increased by3.88%through simulation. |
