| 摘要 |
PROBLEM TO BE SOLVED: To protect an exhaust system component while restraining to the minimum a fuel consumption (exhaust manifold) getting worse, when an exhaust temperature is elevated excessively. SOLUTION: The exhaust temperature (element temperature) is estimated based on an internal resistance of an air-fuel ratio sensor element. When the exhaust temperature reaches the first prescribed temperature (Tmax), a delay time up to an increase of fuel corresponding to a time lag until the exhaust manifold reaches a heat resistance allowable temperature Tem is set in response to a variation of the exhaust temperature. After the delay time lapses, the increase of the fuel is started to make the exhaust temperature low. COPYRIGHT: (C)2008,JPO&INPIT
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