VERFAHREN UND VORRICHTUNG ZUR BESTIMMUNG EINES DRUCKS IM BRENNRAUM EINER BRENNKRAFTMASCHINE

• Main Authors: BACHMAIER, GEORG, GERLICH, MATTHIAS, HENNIG, OLIVER, MOCK, RANDOLF, TUMP, CHRISTIAN
• Format: Patent
• Language: German
• Published: 15.02.2010

The present invention relates to a method and a device for determining a pressure in the combustion chamber of an internal combustion engine, particularly of a motor vehicle, comprising a fuel injection valve protruding into the combustion chamber of the internal combustion engine and having a piezoelectric actuator for actuating an injection needle, which opens or closes an injection opening of the injection valve, an ignition device protruding into the combustion chamber of the internal combustion engine, a control device in contact with the actuator and the ignition device. The device is configured to perform the following steps: (i) measuring the impedance of the combustion chamber fluid by means of the ignition device; (ii) recording a pressure of the fluid present in the combustion chamber by means of electric signals of the piezoelectric actuator; and (iii) determining a corrected pressure value in consideration of the impedance value measured.