Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
2007-05-22
2007-05-22
Denion, Thomas (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
C060S274000, C060S276000, C060S295000, C060S296000, C060S301000
Reexamination Certificate
active
10614903
ABSTRACT:
An exhaust emission control apparatus includes a NOXcatalyst provided within an exhaust passage of an internal combustion engine where fuel combustion is continuously performed at a lean air/fuel ratio, and a reducing agent supply valve within the exhaust passage upstream of the NOXcatalyst. If the NOXstored in the NOXcatalyst is required to be decreased, a selector valve position is selected between a forward and a reverse flow positions so as to decrease a flow rate of the exhaust gas flowing through the NOXcatalyst. Then a reducing agent is supplied upon elapse of a predetermined time period from the timing when the signal instructing to select the position of the selector valve. An oxygen sensor detects an oxygen concentration of the exhaust gas discharged from the NOXcatalyst upon supply of the reducing agent. The elapsing time is corrected such that a peak value of the detected oxygen concentration accords with the target value.
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Denion Thomas
Toyota Jidosha & Kabushiki Kaisha
Tran Diem
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