초록 ▼

Method of controlling the direct injection of fuel into a combustion chamber of an internal combustion engine, according to which, in order to effect injection in relation to a first stroke of the cylinder starting from a dead center, the following steps are performed: estimating during a stroke of

Method of controlling the direct injection of fuel into a combustion chamber of an internal combustion engine, according to which, in order to effect injection in relation to a first stroke of the cylinder starting from a dead center, the following steps are performed: estimating during a stroke of the cylinder preceding the first stroke the pressure which will be present in the suction manifold at the first dead center, estimating an injection advance for the injection on the basis of the estimation of the pressure in the suction manifold, detecting the pressure in the fuel manifold, estimating the mean pressure which will be present in the chamber during the injection on the basis of the estimates effected in the preceding steps and on the basis of a function representative of the course of the pressure in the combustion chamber under reference operating conditions of the engine, estimating the mean flow rate of the injector during the injection on the basis of the pressure difference defined by the pressure detected in the fuel manifold and the mean pressure estimated in the chamber, and calculating and programming a delivery interval for the injector on the basis of the mean flow rate estimated and of the quantity of fuel to be injected.

대표청구항 ▼

[ What is claimed is:] [1.]1. Method of controlling the direct injection of fuel into at least one combustion chamber (4) of an internal combustion engine (2), the engine (2) comprising at least one cylinder (3) defining the said chamber (4), a suction manifold (5) connected to the cylinder (3), at

[ What is claimed is:] [1.]1. Method of controlling the direct injection of fuel into at least one combustion chamber (4) of an internal combustion engine (2), the engine (2) comprising at least one cylinder (3) defining the said chamber (4), a suction manifold (5) connected to the cylinder (3), at least one fuel manifold (11) and at least one injector (12) connecting the fuel manifold (11) to the said chamber (4) for injecting the fuel directly therein, the method being characterised in that, in order to effect a generic injection operation (INJ) in relation to a first stroke (C) of the cylinder starting from a first dead centre (PM.sub.N), it comprises the following steps:a) calculating (40) the quantity of fuel (QB.sub.INJ) to be injected;b) estimating (51) during a second stroke (A) of the cylinder preceding the said first stroke (C) the pressure (P.sub.COLL (PM.sub.N)) which will be present in the suction manifold (5) at the first dead centre (PM.sub.N);c) estimating (52) an injection advance (.phi..sub.INJ) for the said injection (INJ) on the basis of the estimation of the pressure (P.sub.COLL (PM.sub.N)) in the suction manifold (5);d) detecting (54) the pressure (P.sub.FUEL) in the fuel manifold (11);e) estimating (53, 55, 56, 57, 58, 59, 60) the means pressure (P.sub.CAMmean) which will be present in the combustion chamber (4) during the injection (INJ) on the basis of the estimation effected in steps b) and c) and on the basis of a function (f) representative of the course of the pressure in the combustion chamber (4) under reference operating conditions of the engine;f) estimating (61) the mean flow rate (G) of the injector (12) during the injection (INJ) on the basis of the pressure difference (.DELTA.P.sub.2) between the pressure (P.sub.FUEL) detected in the fuel manifold (11) and the mean pressure (P.sub.CAMmean) estimated in the combustion chamber (4), andg) calculating and programming (61) a delivery interval (.DELTA.t.sub.INJprog) for the injector (12) on the basis of the mean flow rate (G) estimated and of the quantity of fuel (QB.sub.INJ) calculated.