| 摘要 |
In a fuel supply control for engines, the amount of fuel supplied to the engine is corrected based on property of fuel which is determined immediately after engine starting. The fuel property is determined based on the amount of fuel injected, but remaining upstream the cylinder and not burned in a cylinder. This fuel property value TNEN is estimated from an accumulated intake air amount TAF and an accumulated fuel injection amount TTAU as TNEN=TTAU.14.7-TTAF. In the above equation, 14.7 indicates the stoichiometric air-fuel ratio to which the air-fuel ratio of air-fuel mixture is controlled while the accumulated intake air amount and the accumulated fuel injection amount are measured. If the calculated value indicates that the fuel is a heavy type, the amount of fuel injected in the next engine starting operation is increased to compensate for the amount of fuel which will remain upstream the cylinder. Alternatively, the fuel property may be determined based on an increase of pressure in a fuel tank detected while the fuel tank is in a fully closed condition.
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