| 摘要 |
PROBLEM TO BE SOLVED: To accurately estimate and detect the temperature of an exhaust cleaning catalyst. SOLUTION: When the catalyst temperature estimation allowing condition is satisfied after starting an internal combustion engine, element impedance Riu and Rid of air fuel ratio sensors provided in the upstream and the downstream of the catalyst are detected, And when a difference between these values exists within the predetermined value, the element temperature Tu and Td estimated on the basis of each element impedance are processed for meaning so as to compute the catalyst temperature Ts.
|
