Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-01-12
1990-03-06
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Fuel injection system
123480, F02D 4114, F02M 5100
Patent
active
049056530
ABSTRACT:
A fuel adhesion percentage of an injected fuel to a surrounding portion of an intake valve is determined in accordance with a fluctuation value of an air-fuel ratio correction coefficient and a fluctuation value of a signal of an air-fuel ratio detecting sensor or a signal of an oxygen amount detecting sensor. Each adhesion percentage of the injected fuel is divided and stored in each division area of a characteristic memory map of a control unit. The adhesion percentage of the injected fuel is stored in a memory of the control unit and is determined in accordance with present throttle valve opening degree and present engine coolant temperature by the characteristic memory map. The adhesion percentage of the injected fuel is obtained through a learning control process in the control unit. An air-fuel ratio correction in a transient period is carried out smoothly.
REFERENCES:
patent: 4452212 (1984-06-01), Takase
patent: 4488906 (1983-06-01), Sugiyama et al.
patent: 4667640 (1987-05-01), Sekozawa et al.
patent: 4790282 (1988-12-01), Kanno et al.
patent: 4793312 (1988-12-01), Doinaga et al.
Manaka Toshio
Shida Masami
Hitachi , Ltd.
Wolfe Willis R.
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