| 摘要 |
PROBLEM TO BE SOLVED: To provide technique for suitably eliminating fouling of an ignition plug due to oil rising in a resting cylinder of a variable cylinder internal combustion engine by ignition of the spark plug, for preventing residues of the spark plug fouling due to the oil and excessive ignition and for realizing all of low power consumption, low fuel consumption and good ignitionability when all the cylinders are operated again. SOLUTION: During a reduced cylinder operation, a degree of fouling of the spark plug of the resting cylinder by the oil rising is estimated at S503. An ignition period or the like of the spark plug of the resting cylinder during the reduced cylinder operation is changed at S504. The spark plug of the resting cylinder is ignited for a necessary and sufficient period to eliminate the fouling of the spark plug estimated at S509 through S514. COPYRIGHT: (C)2004,JPO&NCIPI
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