Device and method for estimating catalytic temperature

Details Device and method for estimating catalytic temperature Device and method for estimating catalytic temperature

2005-10-25

2005-10-25

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Methods

C060S277000, C060S284000, C060S286000, C060S300000, C073S118040

Reexamination Certificate

active

06957527

ABSTRACT:
A device for periodically estimating the temperature of an exhaust-gas purifying catalyst provided in the exhaust pipe of an internal combustion engine. The device includes first, second, third, and fourth estimation blocks. The first estimation block estimates the temperature of exhaust gases that are discharged from the combustion chamber, as a steady catalytic temperature under a steady operation of the internal combustion engine, based on operating conditions of the internal combustion engine. The second estimation block estimates a representative temperature of the interior wall of the exhaust pipe extending from the internal combustion engine to the catalyst, based on the estimated steady catalytic temperature. The third estimation block estimates a catalyst inflow exhaust-gas temperature that flows in the catalyst, based on the estimated steady catalytic temperature and the estimated representative temperature. The fourth estimation block estimates the temperature of the catalyst based on the estimated catalyst inflow exhaust-gas temperature.

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