Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1996-08-28
1997-12-09
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123 9017, F02D 4114, F01L 134
Patent
active
056949120
ABSTRACT:
A fuel injection amount control apparatus for an engine comprises injectors for injecting fuel to an engine and an electronic control unit (ECU) for controlling the injectors. The ECU learns the deviation between the air-fuel ratio of a flammable mixture to be supplied to the engine and the target value. The ECU controls the amount of fuel injection to the engine by reflecting the learning value on the computation of the injection amount. The engine has intake valves, exhaust valves and an apparatus for altering the open/close characteristics of the intake valves. The ECU computes the learning value of the air-fuel ratio in accordance with the behavior of the characteristic altering apparatus and the running conditions of the engine. When the coolant temperature of the engine is low and the learning value is not renewed, the ECU compensates the already updated learning value to a smaller value. The ECU performs this compensation based on the ratio of the real valve characteristic to the valve characteristic for the engine in a fully warmed-up state.
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Gotou Atsushi
Kato Senji
Toyota Jidosha & Kabushiki Kaisha
Wolfe Willis R.
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