EXHAUST SYSTEM TEMPERATURE ESTIMATING DEVICE OF INTERNAL COMBUSTION ENGINE

Japanese Patent JP3403801

B2

PURPOSE: To improve estimating precision of the exhaust system temperature by correcting the stationary temperature and/or the follow-up speed on the basis of the intake air temperature and the vehicle speed in an estimating device for the exhaust system temperature on the basis o the stationary temperature and the follow-up speed.
CONSTITUTION: When the catalyst temperature is estimated by an air-fuel ratio controller in an ECU 5, the intake air temperature TA by a TA sensor 8 is set as an initial value of the catalyst temperature in judging of starting. While, the difference between the target estimated catalyst temperature and the catalyst temperature is calculated in not starting, and whether the difference is larger than 0 or not is judged. When the result is YES, a factor α1 for raising the catalyst temperature based on an integral value is table-retrieved, while, when the result is No, a factor a2 for lowering the catalyst temperature based on the integral value is retrieved. Next, a correction factor Kα of respective factors α1, α2 is determined on the basis of the vehicle speed V and the intake air temperature TA, and then the catalyst temperature is estimated on the basis of the corrected factor α, and the target estimated catalyst temperature to be determined by an intake pipe inside absolute pressure PBA, and an engine speed NE.

Akira Kato
Masami Watanabe

JP7665094A

May 06, 2003

March 23, 1994

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Honda motor industry stock company

F02D45/00; F01N3/24; F02D41/14; (IPC1-7): F02D45/00; F01N3/24; F02D41/14

JP7224640A
JP4171231A
JP62203965A
JP1219340A
JP6397848A

Toshihiko Watanabe

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