Gm Global Technolgoy Operations, Inc.

Antonio Massaro

Serena Tordin

A method of controlling an amount of fuel to be injected by a fuel injector into a cylinder of an internal combustion engine is disclosed. A map stores values of a fuel injection quantity drift of said injector. A fuel injection quantity drift is estimated and stored in a corresponding map point to a current engine operating point. A set of map points whose distance from said corresponding map point is smaller than a given distance are selected. All map points of the set of map points are modified by multiplying their entries by a radial weighing factor. The amount of fuel to be injected by the fuel injector to be the requested amount of fuel is corrected by means of the corresponding entry of the map.

Method of controlling a fuel injection

A method is provided for diagnosing a clogging of an injector in an internal combustion engine equipped with a fuel rail and with a plurality of fuel injectors hydraulically connected to the fuel rail. The method includes, but is not limited to determining a value of a pressure drop in the fuel rail due to a quantity of fuel injected by a tested injector, and diagnosing the clogging of the tested injector if the determined pressure drop value is lower than a threshold value of this pressure drop.

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Turin, Switzerland

Antonio Massaro