Patent ID: 9534554
Date: 2017-01-03
CPC Classifications: F02D

Claim:
1. A fuel injection amount calculation method for calculating a fuel injection amount to an internal combustion engine of a vehicle, the method comprising: measuring an engine speed of the internal combustion engine; measuring an intake pipe internal pressure; generating an A/D value from the measured intake pipe internal pressure; calculating a relative intake pressure which is a difference between an intake pressure peak of intake air upon starting of air intake of a cylinder of the internal combustion engine and an intake pressure bottom of the intake air upon ending of the air intake; calculating an injection MAP value based on the relative intake pressure and the engine speed of the internal combustion engine; calculating the fuel injection amount by adding an invalid injection amount to the injection MAP value; replacing the intake pressure peak with the A/D value if the A/D value is greater than the intake pressure peak; replacing the intake pressure bottom with the A/D value if the A/D value is less than the intake pressure bottom; controlling the relative intake pressure according to the replaced intake pressure peak and the replaced intake pressure bottom; and controlling a fuel injection system to inject fuel into the internal combustion engine according to the fuel injection amount.