Exhaust gas purification system of internal combustion engine

Details Exhaust gas purification system of internal combustion engine Exhaust gas purification system of internal combustion engine

2007-07-17

2007-07-17

Nguyen, Tu M. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By sorber or mechanical separator

C060S274000, C060S286000, C060S295000, C060S297000, C060S303000

Reexamination Certificate

active

10845066

ABSTRACT:
A diesel oxidation catalyst is disposed upstream of a diesel particulate filter (a DPF) disposed in an exhaust passage of a diesel engine. An electronic control unit (an ECU) operates a temperature increasing circuit, which performs post-injection, to eliminate particulate matters accumulated in the DPF. The ECU includes a first correcting circuit and a second correcting circuit. The first correcting circuit corrects a manipulated variable of the temperature increasing circuit based on a result of comparison between a target temperature and a temperature of the DPF estimated based on information related to an area upstream of the DPF. The second correcting circuit corrects the manipulated variable of the temperature increasing circuit based on a result of comparison between the target temperature and the temperature of the DPF estimated based on information related to an area downstream of the DPF.

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