Method for operating a fuel injection system of an internal combustion engine

摘要

A method for operating a fuel injection system of an internal combustion engine is described in which pressurized fuel is provided in a pressure storage device and a fuel pressure prevailing in pressure storage device is regulated with the aid of a pressure regulation, during a first measuring interval at least one fuel withdrawal from the pressure storage device taking place, and during a second measuring interval no fuel withdrawal from the pressure storage device of this type taking place, and during the first and the second measuring intervals a performance quantity of the pressure regulation being ascertained in each case, and the fuel quantity withdrawn during the first measuring interval being ascertained for the at least one withdrawal from a difference of the ascertained performance quantities of the pressure regulation.

主权项

1. A method for operating a fuel injection system of an internal combustion engine, the method comprising:
providing pressurized fuel in a pressure storage device; during a first measuring interval:
performing at least one controlled withdrawal of a predetermined quantity of fuel from the pressure storage device, thereby causing a controlled change in a fuel pressure prevailing in the pressure storage device;a pressure sensor sensing, and outputting a signal corresponding to, a fuel pressure prevailing in the pressure storage device during the first measuring interval as a result of the controlled withdrawal of the predetermined quantity of fuel;regulating, by a pressure regulation device, the fuel pressure prevailing in the pressure storage in response to the signal output by the pressure sensor during the first measuring interval; andascertaining a performance quantity characterizing the pressure regulation performed in response to the signal output by the pressure sensor during the first measuring interval; during a second measuring interval, during which no controlled withdrawal of fuel from the pressure storage device is performed:
the pressure sensor sensing, and outputting a signal corresponding to, a fuel pressure prevailing in the pressure storage device during the second measuring interval;regulating, by the pressure regulation device, the fuel pressure prevailing in the pressure storage in response to the signal output by the pressure sensor during the second measuring interval; andascertaining a performance quantity characterizing the pressure regulation performed in response to the signal output by the pressure sensor during the second measuring interval; and determining a condition of the pressure sensor based on a difference between the performance quantity ascertained for the first measuring interval and the performance quantity ascertained for the second measuring interval.