| 摘要 |
PROBLEM TO BE SOLVED: To activate an exhaust gas sensor in an early stage while preventing element crack of the exhaust gas sensor due to adhesion of moisture. SOLUTION: Moisture condensation preventing control delaying ignition timing of an engine 11 to keep exhaust gas temperature condition where moisture does not condense in an exhaust pipe 19 in an upstream of the exhaust gas sensor 20 after start of the engine is executed until heat quantity given to an exhaust system exceeds a predetermined value to prevent condensation of water in the exhaust pipe 19 in the upstream of the exhaust gas sensor 20. When the moisture condensation prevention control is executed, timing for starting heating of the exhaust gas sensor 20 by a heater after engine start is set at an earlier time (in an embodiment, almost the same time as start) as compared to a case where moisture condensation prevention control is not executed. Consequently, the exhaust gas sensor 20 is activated at an early stage while preventing element crack of the exhaust gas sensor 20 due to adhesion of moisture. COPYRIGHT: (C)2008,JPO&INPIT
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