A method for estimating the combustion of a quantity of fuel injected in a combustion chamber of a compression ignition internal combustion engine

• Main Authors: ANDREA EMILIO CATANIA, GERHARD LANDSMANN, ROBERTO FINESSO, EZIO SPESSA, ALESSANDRO CATANESE
• Format: Patent
• Language: English
• Published: 28.12.2011
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

Disclosed is a method for estimating the combustion of a quantity of fuel injected in a combustion chamber of a compression ignition internal combustion engine during an engine cycle, wherein said quantity of fuel is injected through at least an injection pulse i, and wherein the method comprises the step of cal­culating the heat release rate dQi(t ) due to said at least an injection pulse i according to the following equation: dQ i (t) = k i •[Q FUELi (t-τ i ) -Q(t)] wherein ki is an index representing the speed of the combustion process during said at least an injection pulse i, Q(t) is a total heat released up to the time t, QFUELi(t-τi) is the energy of the fuel injected at the time (t-τi) by said at least an injection pulse i, τi is an index representing the delay between the time at which a certain fuel quantity of said at least an injection pulse i is injected and the time at which it actually burns.