| US 7,546,761 B2 | ||
| Diesel oxidation catalyst (DOC) temperature sensor rationality diagnostic | ||
| Chuan He, Northville, Mich. (US); Richard B. Jess, Haslett, Mich. (US); Jay Tolsma, Grand Ledge, Mich. (US); GuoJun Shi, Canton, Mich. (US); Jose L. DeLeon, Madison Heights, Mich. (US); and Kouji Sakumoto, Commerce Township, Mich. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Mar. 17, 2006, as Appl. No. 11/385,045. | ||
| Claims priority of provisional application 60/670526, filed on Apr. 12, 2005. | ||
| Prior Publication US 2008/0083271 A1, Apr. 10, 2008 | ||
| Int. Cl. G01M 15/10 (2006.01) | ||
| U.S. Cl. 73—114.69 | 21 Claims |
| 1. A temperature sensor control system for an exhaust treatment system of a vehicle having an oxidation catalyst, comprising:
an oxidation catalyst inlet temperature sensor that generates an inlet temperature signal;
an oxidation catalyst outlet temperature sensor that generates an outlet temperature signal; and
a control module that determines a delayed inlet temperature value based on at least one of a calibration factor, a previous
delayed inlet temperature value and said inlet temperature signal and determines whether a difference based on said delayed
inlet temperature signal and said outlet temperature signal is below a difference threshold when an exhaust temperature is
greater than a first threshold temperature and is less than a second threshold temperature.
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