The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2001
Filed:
Nov. 30, 1999
In Kwang Yoo, Ann Arbor, MI (US);
Kenneth M. Simpson, Howell, MI (US);
Stephen F. Majkowski, Rochester Hills, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
An improved method of diagnosing an engine cooling system through the use of a coolant temperature model based on existing sensor information. Proper operation of the engine thermostat and coolant temperature sensor is diagnosed based on an initial comparison of coolant temperature to ambient air temperature at key-on and a later comparison of coolant temperature to a predetermined regulated temperature. The coolant temperature model is used to trigger the initiation of the later comparison to ensure that the diagnostic is performed when the engine is fully warmed up. Advantageously, the modeled coolant temperature may be used for control purposes in the event that the diagnostic detects faulty operation of the coolant temperature sensor.