Research on Optimization Design of Atkinson Cycle Engine Based on Fuel Economy
[Purposes]This paper redesigns the traditional Otto cycle engine into a hybrid Atkinson cycle en-gine to improve engine fuel economy.[Methods]Using the Otto cycle engine as a prototype,a GT-power simula-tion model of the engine was established.By increasing the compression ratio of the engine and the working angle of the intake cam,the original simulation model is modified into an Atkinson cycle engine simulation model.The Atkinson cycle engine simulation model is used to optimize and analyze the working angle of the en-gine intake cam,the closing time of the intake valve,and the closing time of the exhaust valve,thus determining the optimal parameters.[Findings]The Atkinson cycle engine shows a decrease in torque under external charac-teristic conditions,with the highest fuel consumption rate reduced by 7.2%;the minimum fuel consumption rate has decreased from 244 g/kW·h of the original engine to 235 g/kW·h,and the speed range in the low fuel con-sumption area has increased.[Conclusions]The experimental results show that the fuel economy of the opti-mized Atkinson cycle engine has been improved,meeting the working requirements of hybrid vehicles for the engine,and proving the feasibility of the optimization design method.
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