Patent ID: 8793059

Claim:
A method for controlling a fuel injection system of an internal combustion engine, wherein the fuel injection system comprises a manifold and a high-pressure pump and a fuel dosing unit is associated with the high-pressure pump, comprising: controlling the amount of fuel delivered, wherein controlling the amount of fuel delivered is performed by the fuel dosing unit; determining an amount of fuel required for the operation of the internal combustion engine as a function of a correction factor, wherein the correction factor is based on a fuel pressure at the inlet of the high-pressure pump and on a vapor pressure of the fuel to be delivered; ascertaining a pressure difference between the fuel pressure at the inlet of the high-pressure pump and the vapor pressure of the fuel to be delivered for determining the correction factor, wherein the high-pressure pump has a delivery chamber with a check valve disposed at the inlet side of said chamber; ascertaining an opening pressure of the check valve for determining the correction factor; and subtracting the opening pressure of the check valve from the pressure difference to determine a pressure correction value.