Patent ID: 8239118
Filing Date: 2012-08-07
Classification: F02D,F02M

Abstract:
1. A fuel injection system of an internal combustion engine, comprising: a high pressure pump adapted to deliver a fuel mass conveyed from a fuel tank to a high pressure region coupled to a plurality of injectors; a fuel meter adapted to adjust a fuel quantity to be delivered to the high pressure region; a sensor adapted to measure a fuel pressure in the high pressure region; and an electronic control unit arranged for: driving the fuel meter through an energizing signal as a function of a measured fuel pressure and an engine operating mode, determining the energizing signal according to a nominal characteristic curve (A) of the high pressure pump representative of a predetermined relationship between the energizing signal and the fuel mass delivered by the high pressure pump; acquiring an actual energizing signal value related to the fuel mass delivered to the high pressure region in a predetermined engine operating point; determining an offset between an actual energizing signal and a nominal energizing signal related to the fuel mass according to the nominal characteristic curve (A); estimating an updated characteristic curve (B) by applying said offset to the nominal characteristic curve (A); and applying said updated characteristic curve (B) for determining the energizing signal for driving said fuel meter.