Spark advance adjustment
AssigneeSp3H
InventorsAlain Lunati, Johan Fournel, Thierry Gergaud, Guillaume Biteau
Life of this patent
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Abstract
The invention relates to an additional process for the spark advance adjustment. This process is used for the tight adjustment of the spark advance angle depending on the structure of the fuel molecules from at least one mapping. This adjustment covers the entire operation range of the engine. This process reduces the pollutant emission when the engine is cold, as soon as the engine starting and stabilisation phase when the engine control and adjustment systems are not in a closed adjustment loop yet. The spark advance adjustment can also be used for operation at the rattle boundary during high load operation and at the engine full load.
Claims25
Controlled-spark engine comprising an electronic/digital engine control module, said module comprising at least one spark advance management system and means for determining the molecular structure of the fuel supplying said engine, said determination means making it possible to obtain markers of the molecular structure of the fuel, said engine being characterised in that the management system is arranged to use a plurality of functions (a1, a2, . . . , an) for correlating the markers (c1, c2, . . . , cn) of the molecular structure of the fuel with the spark advance value, said functions (a1, a2, . . . , an) being sorted by decreasing order of correlation with the spark advance adjustment values, in order to adjust the value of the spark advance angles according to said functions (a1, a2, . . . , an).
Dependencies are inferred from the claim text.