Method for checking the functionality of individual pump elements of a high-pressure pump in a high-pressure storage fuel injection system

摘要

In a method for checking the functionality of individual pumping elements of a high-pressure pump (6) in a high-pressure storage fuel injection system of an internal combustion engine (1), this is done by driving the pump, requesting a high fuel flow from it and simultaneously controlling the injector (s) connected to the storage unit ( Injectors) (5) to a closing process. The pressure within the reservoir is measured at high frequency, resulting in a plurality of pressure readings during each stroke of a pumping element (7, 8), and it is determined that a malfunction of a pumping element (7, 8) is present if there is a development of pressure readings which increases less than a predetermined proportion of the development of pressure readings of the pumping element with a development with the highest increase.