Exhaust gas purifying apparatus for engine

Details Exhaust gas purifying apparatus for engine Exhaust gas purifying apparatus for engine

2007-12-07

2011-10-11

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S286000, C060S295000, C060S301000, C060S303000

Reexamination Certificate

active

08033096

ABSTRACT:
A temperature-sensitive type urea sensor74is adopted for use in an engine exhaust gas purifying apparatus. The magnitude of convection of urea aqueous solution generated in a storage tank41is determined based on temperature information detected by the urea sensor74. For detection of abnormality, a detected concentration Dn is adopted when the percentage GRDt of temperature change of urea aqueous solution is small, so that convection is small and it is determined not to affect accurate detection of an abnormality.

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