| 摘要 |
PROBLEM TO BE SOLVED: To accurately estimate temperature of air flowing to a combustion chamber, even if a rapid fluctuation in temperature of intake air is observed due to a state change in exhaust circulating current, a supercharging means, or a cooling means in an internal combustion engine. SOLUTION: An intake temperature sensor 18 is disposed at a connecting part between an inter cooler 13 and an exhaust gas circulating current tube 16. Intake temperature is obtained after adding the response delay of the intake temperature sensor 18. Then, the temperature of intake air flowing to the downstream side from the connecting part of an intake tube 11 and the exhaust gas circulating current tube 16, namely, a combustion chamber 15 is estimated based on the intake temperature and total intake mass, exhaust circulating current mass, and exhaust circulating current temperature. An air-fuel ratio map for an internal combustion engine is corrected based on the estimated intake temperature.
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