Testing method for common-rail fuel injection system for automobile IC engine with measurement of pressure in common-rail pressure reservoir after starting and disconnection of high pressure pump

摘要

The testing method has a pressure regulating valve on the output side of the common-rail pressure reservoir held open during an initiation phase (A) with zero engine revs (34), before detecting the pressure in the common-rail pressure reservoir over a first measuring interval (B) after starting the high pressure pump and a second measuring interval (C) after disconnection of the high pressure pump, with the injection valves and the pressure-regulating valve held closed during both intervals. The measured pressure values and/or pressure characteristics are compared with reference values for detecting a fault in the common-rail fuel injection system. An independent claim for an engine control provided with a control interface for testing a common-rail fuel injection system is also included.