Patent ID: 9284904
Filing Date: 2016-03-15
CPC Classification: F02D,Y02T

Claim Text:
1. A method for monitoring a fuel pressure in a fuel injection system of an internal combustion engine, the method comprising: executing a first fuel injection and a subsequent second fuel injection in a monitoring time interval which is shorter than a decay time of a pressure wave in the fuel injection system triggerable by the first fuel injection; setting a setpoint fuel pressure in response to an operating state of the fuel injection system at which there is a first actual fuel pressure in the fuel injection system, the setpoint fuel pressure being maintained after a change in the fuel injection system to a second actual fuel pressure; setting a setpoint fuel injection quantity based on the setpoint fuel pressure; ascertaining a monitored fuel injection quantity injected via the second fuel injection; and outputting to a user of the internal combustion engine a warning of a defective pressure sensor when the monitored fuel injection quantity differs by more than a limiting value from the setpoint fuel injection quantity.