Method for diagnosis of a volume flow control valve in an...

Details Method for diagnosis of a volume flow control valve in an... Method for diagnosis of a volume flow control valve in an...

2008-06-24

2008-06-24

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S333000, C123S456000, C073S116070, C073S118040

Reexamination Certificate

active

07389767

ABSTRACT:
The invention relates to an internal combustion engine comprising a high-pressure accumulator injection system wherein the swept volume and the pressure are regulated by means of a volume flow control valve (VCV) and a pressure control valve (PCV). The inventive method consists in checking, during the overrun condition of the internal combustion engine, whether predetermined release conditions for carrying out the diagnosis are fulfilled, and in the event of a positive result, the control valve (VCV) is closed for a predetermined period of time (t1). During said period (t1), values relating to fuel pressure (FUP) are detected by means of the pressure sensor (21) and compared with a predetermined threshold value (FUP-SW), the control valve (VCV) being deemed faultless if said fuel pressure (FUP) values are sufficiently often below the threshold value (FUP_SW) during the cited period of time (t1).

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