Patent ID: 9644565
Date: 2017-05-09
CPC Classifications: F02D,Y02T

Claim:
1. A method of controlling an amount of fuel to be injected by a fuel injector into a cylinder of an internal combustion engine using, the method including the following steps: defining a map storing map points for a fuel injection quantity drift of an injector, the map points being arranged along an x-axis as a function of engine operating points along a y-axis, wherein the engine operating points are defined by different values of engine speed and requested amount of fuel to be injected by the fuel injector; estimating a fuel injection quantity drift and storing it in a corresponding map point to a current engine operating point; selecting a set of map points whose distance from said corresponding map point is less than a given distance; modifying each map point of said set of map points by a radial weighing factor; correcting the amount of fuel to be injected by the fuel injector to be the requested amount of fuel by the corresponding entry of the map to define a corrected fuel request; and controlling an amount of fuel to be injected by the fuel injector using the corrected fuel request; wherein the distance between said corresponding map point and each map point of said set of map points is calculated according to the following equations: where: Xdist(j)=distance between the corresponding map point to a current engine operating point and a selected map point, projected along the x-axis; Ydist(i)=distance between the corresponding map point for a current engine selected map point, projected along the y-axis; n(j)=value of engine speed, stored in the map; engine_speed=current engine speed value; Xnorm=normalization factor values of engine speed; V(i)=value of requested amount of fuel, stored in the map; fuel request=requested amount of fuel; Ynorm=normalization factor for values of requested amount of fuel; and distance (j,i)=distance between the corresponding map point to a current engine operating point and a selected map point.