Patent ID: 9429093
Filing Date: 2016-08-30
CPC Classification: F02D,Y02T

Claim Text:
1. A method for operating a fuel injection system for an internal combustion engine in which pressurized fuel is made available in a pressure accumulator and a fuel pressure prevailing in the pressure accumulator is ascertained with the aid of a pressure sensor and in which the fuel enters a combustion chamber of the internal combustion engine through at least one fuel injection device, the method comprising: ascertaining, via a control unit, a slope of a curve, which links a pressure difference in the pressure accumulator during a fuel injection to an injected fuel quantity, wherein the pressure difference and the injected fuel quantity are input to the control unit; and inferring, via the control unit, the fuel pressure prevailing in the pressure accumulator from the slope; and outputting, via the control unit, the inferred fuel pressure; wherein to ascertain the slope, the fuel quantity injected by the fuel injection device is changed cyclically.