Simulating and Modeling of Intake Pipe Fuel Film Dynamic Characteristic under Gasoline Engine Transient Condition

During the gasoline engine transient process, both fuel quantity and fuel film parameter change, fuel film dynamics balance in intake pipe is destroyed, which makes the fuel quantity from nozzle and fuel quantity into the cylinder not be equaled. Therefore, fuel film model need to be established accurately in order to control the air fuel ratio accurately. The costumed fuel film model of Aquino is introduced in detail, and the characteristic of Aquino model used in gasoline engine transient process is also analyzed. Based on Aquino fuel film model, a new kind of dynamic fuel film model is presented, in which the change of intake parameter is considered. The air fuel ratio variable of two fuel film model is simulated by using SIMULINK under gasoline engine transient condition, and the simulated result is compared with experiment data. The result shows that the intake pipe fuel film dynamic characteristic is accurately described by the presented model, and the accuracy of presented model is higher than Aquino model.