A METHOD FOR CHECKING THE FUNCTIONALITY OF INDIVIDUAL PUMPING ELEMENTS OF A HIGH-PRESSURE PUMP IN A HIGH-PRESSURE ACCUMULATOR 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 accumulator fuel injection system of an internal combustion engine (1) this is done by driving the pump while demanding a high fuel flow therefrom and simultaneously controlling the injector(-s) (5) connected to the accumulator to be closed. The pressure inside the accumulator is measured at a high frequency resulting in a plurality of pressure measuring values during each stroke of a pumping element (7, 8) and it is determined that there is a malfunction of a pumping element (7, 8) when it has a development of pressure measuring values increasing less than a predetermined proportion of the development of pressure measuring values of the pumping element having a development with the highest increase.