Gm Global Technolgoy Operations, Inc.

Matteo Allasia

Massimiliano Melis

Vincenzo Rampino

A method is provided for estimating a hydraulic dwell time between a first injection pulse and a second injection pulse performed by a fuel injector of an internal combustion engine. The method includes, but is not limited to determining a value of an electric dwell time between the first injection pulse and the second injection pulse, estimating a value of an injector closing delay between an instant in which an electric closing command of the first injection pulse is generated and an instant in which the fuel injector closes, estimating a value of an injector opening delay between an instant in which an electric opening command of the second injection pulse is generated and an instant in which the fuel injector opens, and calculating a value of the hydraulic dwell time as a function of the electric dwell time value, of the injector closing delay value and of the injector opening delay value.

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Fossan, Italy

Matteo Allasia