Method for determining NO x reduction ratio in exhaust...

Details Method for determining NO x reduction ratio in exhaust... Method for determining NO x reduction ratio in exhaust...

2005-07-21

2009-06-09

Denion, Thomas E (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S276000, C060S286000, C060S295000, C060S301000

Reexamination Certificate

active

07543443

ABSTRACT:
When urea water U is injected by an addition nozzle7upstream of NOxreduction catalyst6incorporated in an exhaust passage5of a diesel engine1so as to reduce and purify NOxin exhaust G, both a value measured by a NOxconcentration sensor9upstream of the nozzle7and a value measured by a NOxconcentration sensor12downstream of the catalyst6are corrected by using a primary response model depending upon a flow rate and a temperature of exhaust G. The NOxreduction ratio is obtained on the basis of these corrected NOxconcentration values. Rectified are time lag of measuring of a value by the downstream NOxconcentration sensor12from measuring of a value by the upstream NOxconcentration sensor9in a case of the exhaust G having a lower flow rate, and error due to lowering of NOxreduction processing speed in a case of the exhaust having a lower temperature.

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