EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine which can obtain correct information on temperature of a catalyst located in an exhaust passage of the internal combustion engine.

SOLUTION: An influence degree emthc of a catalyst inlet gas temperature and a catalyst rear end temperature ethuf[end] is calculated (S102). An estimated value ethco of an outlet gas temperature is calculated by a weighted average of the inlet gas temperature and the catalyst rear end temperature ethuf[end], taking the influence degree emthc into account (S104). A temperature correction coefficient ekthuf[x] for every part of the catalyst is calculated as a function f(emthc) of the influence degree emthc (S108). A difference between the estimated outlet gas temperature value ethco and an actually measured value of the outlet gas temperature is multiplied by the temperature correction coefficient ekthuf[x] so as to determine an estimated value correction quantity ecthuf[x] (S110). The estimated value correction quantity ecthuf[x] is added to an estimated value of the catalyst temperature (S114).

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