Exhaust gas purifying system for internal combustion engine

Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...

Reexamination Certificate

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Details

C060S274000, C060S278000, C060S280000, C060S286000, C060S295000, C060S300000

Reexamination Certificate

active

06952919

ABSTRACT:
An exhaust gas purifying system for an automotive internal combustion engine. The exhaust gas purifying system includes a particulate filter disposed in an exhaust gas passageway of the engine to collect particulate in exhaust gas flowing through the exhaust gas passageway. The collected particulate is burnt off to be removed by raising a temperature of exhaust gas in a condition in connection with the particulate filter. A plurality of devices are provided for raising the temperature of exhaust gas to be introduced into the particulate filter through the exhaust gas passageway when the collected particulate is burned off to be removed. Additionally, a control unit is configured to select at least one of the devices in accordance with an engine operating region and preferentially operate the selected at least one of the devices for raising the exhaust gas temperature.

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