In order to improve the steady state and dynamic characteristics of the engine idling process,using MATLAB/Simulink software,the fuzzy control theory is applied in engine idling process control.Through comparing with three different control strategies,it is found that the hybrid control strategy with the combination of PID and fuzzy control is the best in engine idling process control.The results of test and computer simulation indicate that the strategy can not only improve the stability of gasoline engine idling,but also reduce the undulate of idle speed.

本文依靠试验数据,利用Fluent6.2软件对直喷式(DI)柴油机的点火延迟模型进行介绍和验证.由于与标准的点火延迟值相比,用户在大范围内输入最低负载和速度后的一致性良好.因此,模拟装置证明,可以利用Fluent6.2软件中的模型进行缸内燃烧的模拟.

CFD technology can solve the governing equations of the fluid including flow,heat transfer,combustion,multiphase flow and chemical reactions,and it features a large amount of information,low cost,short period and high efficiency.However,FLUENT is a kind of CFD software with the most widely application and the greatest influence.Thus, this paper mainly introduces the application of software FLUENT in numerical simulation of the engine working process and describes particularly the specific operation steps.Based on the profound study,the paper proposes a method to simulate the engine working process.