Patent ID: 7185637

Claim:
A fuel injection control method for an engine in which an electronic control unit calculating a pressure integrated value for one combustion cycle by detecting a combustion cycle by a crank angle detecting means and continuously detecting a suction air pipe pressure by a suction air pipe pressure detecting means determines that the engine is under an accelerated state in the case that a pressure difference determined by comparing said pressure integrated value with said pressure integrated value at the preceding time becomes equal to or more than a predetermined acceleration determining reference value, thereby increasing a fuel amount, wherein said fuel supply system is provided with an atmospheric pressure detecting means, and executes an acceleration determination that the engine is under the accelerated state in said electronic control unit in the case that a difference between said pressure integrated value and the atmospheric pressure detected by said atmospheric pressure detecting means is equal to or less than a predetermined reference value, and a pressure difference multiplied value obtained by multiplying said pressure difference within a predetermined multiplying period including this time combustion cycle is equal to or more than a predetermined reference value, even if said calculated pressure value is less than said acceleration determining reference value.