Method and device for calibrating a pressure sensor in a fuel metering system

The method as recited in one of the preceding claims,

• wherein the pressure sensor is calibrated immediately after the control unit of the fuel metering system is initialized.

The method as recited in one of the preceding claims,

• wherein the pressure sensor is calibrated in that the atmospheric pressure (Dm′) measured by the pressure sensor when the internal combustion engine is at a standstill is compared to a setpoint value (Dabs) for the absolute atmospheric pressure, the difference between the measured atmospheric pressure (Dm′) and the setpoint value (Dabs) indicates a calibration value (OD), which is later applied to the pressure values (Dm) measured while the internal combustion engine is in operation.

A device (100) for calibrating at least one pressure sensor of a fuel metering system of an internal combustion engine, having a pump that transports the fuel from a low-pressure region to a high-pressure region and injectors that are controllable as a function of operating parameters and meter the fuel into the combustion chambers of the internal combustion engine, the at least one pressure sensor measuring the pressure (Dm) in the high-pressure region and/or in the low-pressure region while the internal combustion engine is in operation, and the device using the atmospheric pressure (Dm′) measured by the pressure sensor to calibrate the pressure sensor prior to the start of the internal combustion engine,

• wherein the device measures the cooling-water temperature (Ta) of the internal combustion engine and derives the cooling-water temperature drop therefrom as a measure for the standstill time of the internal combustion engine, and the device first calibrates the pressure sensor when the standstill time exceeds a predefinable minimum.

A control element for a fuel metering system of an internal combustion engine having a device (100) for calibrating at least one pressure sensor of the fuel metering system, including a pump that transports the fuel from a low-pressure region to a high-pressure region and injectors that are controllable as a function of operating parameters and meter the fuel into the combustion chambers of the internal combustion engine, the at least one pressure sensor measuring the pressure (Dm) in the high-pressure region and/or in the low-pressure region while the internal combustion engine is in operation, and the device using the atmospheric pressure (Dm′) measured by the pressure sensor to calibrate the pressure sensor prior to the start of the internal combustion engine,

• wherein the device measures the cooling-water temperature (Ta) of the internal combustion engine and derives the cooling-water temperature drop therefrom as a measure for the standstill time of the internal combustion engine, and the device first calibrates the pressure sensor when the standstill time exceeds a predefinable minimum.

A fuel metering system for an internal combustion engine having a device (100) for calibrating at least one pressure sensor of the fuel metering system, including a pump that transports the fuel from a low-pressure region to a high-pressure region and having injectors that are controllable as a function of operating parameters and meter the fuel into the combustion chambers of the internal combustion engine, the at least one pressure sensor measuring the pressure (Dm) in the high-pressure region and/or in the low-pressure region while the internal combustion engine is in operation, and the device using the atmospheric pressure (Dm′) measured by the pressure sensor to calibrate the pressure sensor prior to the stat of the internal combustion engine,

• wherein the device measures the cooling-water temperature (Ta) of the internal combustion engine and derives the cooling-water temperature drop therefrom as a measure for the standstill time of the internal combustion engine, and the device first calibrates the pressure sensor when the standstill time exceeds a predefinable minimum.