| 摘要 |
PURPOSE:To speed up a temperature rise in an exhaust catalyzer floor at the time of cold engine starting, by setting a timing delay compensation value according to the lapse of time from an engine starting point when the engine is in a state other than the specified running one, while compensating the optimum ignition timing with this timing delay compensation value. CONSTITUTION:In case of an engine provided with an exhaust emission control device controlling a harmful exhaust gas component with a catalyzer, whether the present running state is just after coming off a cranking state or not is judged. When NO is judged, a timing delay compensation value is determined according to the detected value of the lapse of time from an engine starting point in the case where engine speed is below the specified one (for example, 3,000r.p.m.), throttle valve opening below the specified one (for example, 20deg), suction temperature below the specified one (for example, 15 deg.C) and cooling water temperature below the specified one (for example, 70 deg.C), that is, the engine is in the specified running state. And, with this timing delay compensation value, the precalculated optimum ignition timing is controlled so as to be compensated.
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