| 摘要 |
PROBLEM TO BE SOLVED: To increase the temperature increase accelerating effect of a catalyst while securing combustion stability after cold-starting and reduce the exhaust amount of a harmful exhaust component during the same in an engine controller for accelerating, when the catalyst is in a non-warmed state, the temperature increase of the catalyst by delaying ignition timing by an ignition timing control unit so as to increase an exhaust gas temperature. SOLUTION: The angular speed fluctuation data dωf(i) of a crankshaft is detected by a roughness detecting section 38. According to the angular speed fluctuation data, a roughness controlled variableθrough (n) is increased/ decreased by an ignition timing correction control unit 39 so as to correct ignition timing, and thereby an engine combustion state is controlled. An engine speed in an idle state is controlled to be high by an ISC control unit 42, and the combustion stability and exhaust heat amount of the engine are increased. Based on a signal outputted from the O2 sensor 26 of an exhaust route, the air-fuel ratio of a mixture is feedback-controlled to a stoichiometric air-fuel ratio by a fuel injection control unit 40. Until the O2 sensor is activated, the air-fuel ratio may be controlled to the rich side.
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