Diesel engine exhaust gas after-treatment device

Details Diesel engine exhaust gas after-treatment device Diesel engine exhaust gas after-treatment device

2006-07-03

2008-09-09

Tran, Binh Q (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S277000, C060S285000, C060S297000

Reexamination Certificate

active

07421838

ABSTRACT:
A diesel engine exhaust gas after-treatment device comprising a first temperature sensor that detects the temperature either upstream or downstream from a filter as a first temperature and detects the filter's other temperature as a second temperature, and a microcomputer. The microcomputer calculates the filter's hypothetical bed temperature from the temperature of either of the first and second temperatures; calculates the heat radiation coefficient from the filter to the external atmosphere according to the exhaust gas flow rat; and calculates the second temperature's estimated temperature based on the heat radiation coefficient and the above-described one first temperature. The filter's estimated bed temperature is found based on the above-described hypothetical bed temperature and the above-described detected second temperature and the above-described second temperature's estimated temperature. The microcomputer regenerates the filter based on the estimated bed temperature.

REFERENCES:
patent: 7048891 (2006-05-01), Kinugawa et al.
patent: 7152392 (2006-12-01), Kuboshima et al.
patent: 7243491 (2007-07-01), Okugawa et al.
patent: 7266944 (2007-09-01), Okugawa et al.
patent: 2005/0143899 (2005-06-01), Ueno et al.

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