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Contribution of Fuel Transport Lag and Statistical Perturbation in Combustion to Oscillation of SI Engine Speed at Idle

1987; Linguagem: Inglês

10.4271/870545

2688-3627

Hiroyasu Ando, M. Motomochi,

Combustion and flame dynamics

Periodic oscillations of the speed of SI engine with MPI system at idle observed in the steady state and in the converging process after the initial increase of load were investigated. These non-steady phenomena are the self-excitations of the closed-loop system induced by the lag factors inherent to the system such as the manifold charging delay and the fuel metering and transport lag and by the nonlinear factors such as the sensitivity of the torque to the equivalence ratio. But, even in the cases where the lags and the nonlinearity are insufficient, continuous oscillations with large amplitude are observed in the actual engine.