| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 96 === This paper investigated the phenomenon about wall wetting in scooter engine. A nonlinear engine model is established by Matlab/Simulink to simulate the fuel film dynamics. The fuel film dynamics model will be identified as the first order model. The recursive least squared technique is employed to identify the wall-wetting phenomena. The simulation results show that proposed model for fuel film dynamics has good results as predict. In the engine experiment, the author set up different engine operation conditions, for example, various fuel injection timings and intake temperatures. The experimental results show that when the intake temperature increased, the portion of fuel that deposited on the manifold wall (x) and the time constant of the fuel evaporation process (τ) will be decreased. Moreover,x and τ decreased as the fuel injected and the intake valve opened at the same time. As engine speed increases,x and τ will decrease due to an increase in forced heat and mass convection.
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