Method and device for controlling a spark-ignition engine to increase the efficiency of a particulate filter

Abstract

The invention relates to a method for controlling a spark-ignition engine (1) equipped with an exhaust gas treatment system comprising a particulate filter (7) and a three-way catalyst (6), by controlling the fuel injection into a combustion chamber (8) of the engine (1), and by controlling the ignition of an air-fuel mixture present in the combustion chamber (8) of the engine (1). The fuel injection comprises one or more fuel injection sequences including an injection centered at top dead center and triggered so as to create an ignition delay in a mixture sufficiently rich to generate a deposition of fine particles in the exhaust gas treatment system. Reference: Figure 2

Claims

top dead center (TDC_comb) or the last injection of the sequence (15).

8. System according to one of claims 6 and 7, in which the control means (13) are configured so that the injections (15) are caused at angles of the engine cycle (1) between 180° and -20°, preferably between 80° and -12° of crankshaft.

9. System according to any one of claims 6 to 8, comprising ignition control means (14) configured to cause ignition (AVA) after the end of the last injection (16) with a delta (deviation) of between 3° and 8° of crankshaft, so that ignition (AVA) occurs between -4° and -28° of crankshaft.

10. A motor vehicle comprising a control system, according to any one of claims 6 to 9. 5 / 6

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