Method and device for monitoring a high-pressure fuel system

• Main Authors: KRIECHBAUM CHRISTIAN, TOPP STEPHAN, PECK RAINER, MEYER-SALFELD STEFFEN, ZIEHER RENE
• Format: Patent
• Language: Chinese; English
• Published: 18.07.2012
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

The invention relates to a method for monitoring a fuel pressure in a fuel injection system of an internal combustion engine. First, a target fuel pressure is set in the fuel injection system. Afterwards, a first and a subsequent second fuel injection are carried out at a time interval which is shorter than a decay time of a pressure wave in the fuel injection system, said pressure wave being triggerable by the first fuel injection. In a further step, a monitoring fuel-injection amount, which is injected by means of the second fuel injection, is measured. If the monitoring fuel-injection amount varies from a target fuel-injection amount, which can be specified for the target fuel pressure, by more than a threshold value, an action is carried out. The invention further relates to a computer program product for carrying out the method and to a device for monitoring a fuel pressure in a fuel injection system of an internal combustion engine.