Exhaust purifying apparatus and exhaust purifying method for...

Details Exhaust purifying apparatus and exhaust purifying method for... Exhaust purifying apparatus and exhaust purifying method for...

2007-11-27

2007-11-27

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S295000

Reexamination Certificate

active

11085127

ABSTRACT:
During sulfur release control in an internal combustion engine, a rich period and a lean period are alternately repeated. The air-fuel ratio of exhaust gas is controlled toward a target air-fuel ratio (14.3) by adding fuel from a fuel adding valve in the rich period. An ECU determines whether the actual air-fuel ratio of exhaust gas detected by an air-fuel ratio sensor has reached a stoichiometric air-fuel ratio each time the rich period ends at which addition of fuel from the fuel adding valve is stopped. A counter counts the number of times the ECU has determined that the actual air-fuel ratio of exhaust gas has not reached the stoichiometric air-fuel ratio. When the value of the counter becomes greater than or equal to a permissible value, the ECU determines that there is an abnormality in the sulfur release control.

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German Language Version of German Office Action for Appln. No. 10 2005 014 757.7-26 issued Aug. 4, 2006.
English Translation of German Office Action for Appln. No. 10 2005 014 757.7-26 issued Aug. 4, 2006.

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