| US 7,467,628 B2 | ||
| Oxygen sensor heater control methods and systems | ||
| Justin F. Adams, Ypsilanti, Mich. (US); Louis A. Avallone, Milford, Mich. (US); Dale W. McKim, Howell, Mich. (US); Jeffrey A. Sell, West Bloomfield, Mich. (US); John W. Siekkinen, Novi, Mich. (US); and Julian R. Verdejo, Farmington, Mich. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Jan. 31, 2007, as Appl. No. 11/669,238. | ||
| Prior Publication US 2008/0178856 A1, Jul. 31, 2008 | ||
| Int. Cl. F02D 41/00 (2006.01); F02D 41/02 (2006.01) | ||
| U.S. Cl. 123—697 | 11 Claims |
| 1. An oxygen sensor heater control system, comprising:
at least one oxygen sensor disposed downstream of an engine wherein the oxygen sensor includes an oxygen sensor heater; and
a control module that measures a resistance of the oxygen sensor heater, maps the resistance to an exhaust gas temperature,
and selectively delays activation of the oxygen sensor heater based on the exhaust gas temperature and a dewpoint temperature
threshold.
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