Systems and method for monitoring urea level

Details Systems and method for monitoring urea level Systems and method for monitoring urea level

2009-02-05

2011-11-01

Williams, Hezron E (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Liquid level or volume measuring apparatus

C073S307000

Reexamination Certificate

active

08047046

ABSTRACT:
A sensor diagnostic system comprises first, second, and third dosing agent sensors and a control module. The first, second, and third dosing agent sensors indicate whether a dosing agent is present at first, second, and third volumetric levels of a dosing agent tank, respectively. The second volumetric level is greater than the first volumetric level and the third volumetric level is greater than the second volumetric level. The control module selectively diagnoses a sensor fault in at least one of the first, second, and third dosing agent sensors based on the indications of the first, second, and third dosing agent sensors.

REFERENCES:
patent: 6575010 (2003-06-01), Colman et al.
patent: 6637196 (2003-10-01), Tost
patent: 2006/0086080 (2006-04-01), Katogi et al.
patent: 2101178 (1992-04-01), None

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