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An ignition device sets a total discharge period, each discharge period and each intermittent period of a multiple discharge are set by a control map in addition to the setting of a throttle opening, fuel injection timing, fuel injection period and ignition timing for the range of non-stratified cha

An ignition device sets a total discharge period, each discharge period and each intermittent period of a multiple discharge are set by a control map in addition to the setting of a throttle opening, fuel injection timing, fuel injection period and ignition timing for the range of non-stratified charge combustion, when a direct injection-type engine operates in the range of stratified charge combustion. Ignition signals including a plurality of rises and falls are outputted in time with a specific ignition timing after fuel injection. Thus a plurality of sparks are generated from the spark plug, ensuring reliable ignition in response to changes in the concentration of sprayed fuel within the operation range for stratified charge combustion.

대표청구항 ▼

1. A spark ignition device in a direct injection-type engine in which fuel is directly injected into each cylinder, comprising:a spark plug mounted on each cylinder of the direct injection-type engine; an ignition coil for applying a high voltage to generate a spark at the spark plug at an ignition

1. A spark ignition device in a direct injection-type engine in which fuel is directly injected into each cylinder, comprising:a spark plug mounted on each cylinder of the direct injection-type engine; an ignition coil for applying a high voltage to generate a spark at the spark plug at an ignition timing; and ignition control means for intermittently applying the high voltage from the ignition coil two or more times, wherein the ignition control means generates multiple discharges at the spark plug at least in a part of operating conditions for stratified charge combustion, wherein the ignition control means calculates a changeover between multiple discharge and single discharge, total discharge period from start to end of multiple discharge, each discharge period, each intermittent period on the basis of a control map in which those are preset by each operating condition of the direct injection-type engine, and wherein the total discharge period of the multiple discharge is set within the range of 1.0 to less than 3.0 ms.