Analytical Study On Key Technologies Of Benchmark Hybrid Engine

Through the adoption of key technologies,the advanced hybrid engines in the world have achieved better power and fuel economy.In the development of hybrid engines,it is important to analyze the impact of key technologies on the performance of hybrid engines.The paper used an advanced engine as the benchmark engine,and studied the impact of key technologies on the performance of the benchmark engine,and further studied the impact of other key technologies on the performance of the benchmark engine.On this basis,the impact of the above key technologies on the fuel economy of the benchmark engine was comprehensively evaluated.The research analyzed the key technologies of hybrid engines and provided a research basis for hybrid engine development.Firstly,through the structural measurement of the benchmark engine,and based on the bench test data,the GT-PO WER software was used to establish the benchmark engine simulation model.Using the modeFRONTIER software coupled with GT-POWER,the simulation model was calibrated by multi-objective at the high efficiency working operations of the engine.The benchmark engine simulation model with high accuracy and reliability was obtained.Subsequently,the impact of the key technologies of the benchmark engine on the benchmark engine performance was studied.The influence of GDI on the combustion process of the engine was analyzed.The influence of GDI on the engine power and fuel economy was also studied.The influence of intake and exhaust valve timing on the engine gas exchange process was analyzed.The influence of intake and exhaust valve timing on engine power and fuel economy was also studied.The influence of Miller cycle on engine gas exchange process,fuel economy and fuel energy distribution was studied.In the end,the effects of GDI technology,variable valve timing technology and Miller cycle technology on fuel economy were obtained.Next,research of the impact of other key technologies on the performance of the benchmark engine was carried out.The effects of EGR rate on combustion process,power and fuel economy were analyzed.The effects of high compression ratio on engine combustion process,power and fuel economy were studied.Based on fuel economy,the cylinder deactivation position was analyzed,and the effects of cylinder deactivation on engine fuel economy were studied.In the end,the effects of exhaust gas recirculation technology,high compression ratio technology and cylinder deactivation technology on engine fuel economy were obtained.Finally,a comprehensive evaluation of the effects of key technologies based on engine fuel economy was conducted.The sensitivities of key technologies' parameters to fuel consumption rate were analyzed.The orthogonal design method wae used to study the key technologies to improve the fuel economy of the engine,and the interactions between key technologies were researched.As results,the sensitivities to fuel economy,the impact weights of different key technologies and the interactions between key technologies were obtained.There are 79 Figures,30 tables and 81 references in this thesis.