Exhaust gas purification method and exhaust gas purification system
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United States of America Patent
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Jan 1, 2013
Grant Date -
Jan 22, 2009
app pub date -
Apr 24, 2006
filing date -
May 16, 2005
priority date (Note) -
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Abstract
An exhaust gas purification system has a NOx purification catalyst that purifies exhaust gas of NOx when an air-fuel ratio of exhaust of an internal combustion engine mounted on a vehicle is in a lean condition and recovers purification ability when the air-fuel ratio is in a rich condition. The system performs recovery control for setting the exhaust gas to a rich air-fuel condition in order to recover the NOx purification ability of the NOx purification catalyst, and at a time of retardation of the vehicle, both a fuel system rich control and an air intake rich control are used in the recovery control. The recovery control can be performed without worsening the drive comfort of the vehicle and with less fuel consumption.
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