Patent ID: 6705296
Filing Date: 2004-03-16
Classification: F02D

Abstract:
A method for calibrating at least one pressure sensor of a fuel metering system of an internal combustion engine, comprising:transporting a fuel by a pump from a low-pressure region to a high-pressure region; metering the fuel from the high-pressure region by injectors that are controllable as a function of operating parameters into combustion chambers of the internal combustion engine; measuring a pressure in at least one of the high-pressure region and the low-pressure region by the at least one pressure sensor while the internal combustion engine is in operation; measuring an atmospheric pressure by the at least one pressure sensor prior to a start of the internal combustion engine in order to calibrate the at least one pressure sensor; determining a cooling-water temperature of the internal combustion engine; deriving from the cooling-water temperature a cooling-water temperature drop as a measure for a standstill time of the internal combustion engine; and calibrating the at least one pressure sensor for a first time when the standstill time exceeds a predefinable minimum.