CPC F02D 35/026 (2013.01) [F02D 13/0215 (2013.01); F02D 35/023 (2013.01); F02D 35/027 (2013.01); F02D 41/0047 (2013.01); F02D 41/3029 (2013.01); F02D 41/401 (2013.01); F02D 41/402 (2013.01); F02P 5/153 (2013.01); F02P 5/1521 (2013.01)] | 15 Claims |
1. A process to adjust the ignition timing of an air-fuel mixture in a combustion chamber (6) of an internal combustion engine (2), the process comprising the steps of
a. determining a first quantity indicative of a pressure of the mixture for a cycle of the engine,
b. determining a second quantity indicative of a speed of the engine (2),
c. determining a third quantity indicative of a first temperature of a conditioning fluid used to thermally condition the combustion chamber (6) at a zone of heat exchange between the engine (2) and the conditioning fluid,
d. providing a heat exchange mathematical model for the combustion chamber (6), the model mapping the set of three quantities, consisting of the first, the second and the third quantity, onto a fourth quantity indicative of a second temperature of a wall portion (3, 5) of the engine (2) around the combustion chamber (6),
e. estimating the fourth quantity by means of the three determined quantities and by means of the mathematical model, and
f. adjusting the ignition timing as a function of the fourth estimated quantity.
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