| 摘要 |
A method of diagnosing a fault of fuel injectors 160 (see Figure 1) of an internal combustion engine 110 (see Figure 1), wherein the method comprises the following steps: a) operating the engine at idle speed, with a maximum injection pressure (prail_max); b) de-rating all but one fuel injector to a predetermined value of a fuel injection quantity (Qderat); c) increasing a fuel injection request (fuelreq), by means of a control strategy for operating the engine at idle speed; d) repeating steps b) and c) for each group of all but one fuel injector; e) diagnosing a fault of an injector if an instantaneous increase of the engine speed (Δrpmlocal), during a crank angle window corresponding to the actuation of said injector, is smaller than an engine speed threshold (Δrpmlocal_thr). Diagnosing a fault in all the injectors if the fuel injection request is larger than a fuel injection request threshold. |
