System and method for diagnosing failure of thermostat
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United States of America Patent
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Aug 11, 2015
Grant Date -
Oct 23, 2014
app pub date -
Jul 31, 2013
filing date -
Apr 17, 2013
priority date (Note) -
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Abstract
A system and method for diagnosing failure of a thermostat that includes a controller configured to measure a coolant temperature and a coolant model temperature and determine a temperature of engine oil, when the coolant temperature is greater than a first reference temperature and the coolant model temperature is equal to or less than a second reference temperature. In addition, the controller is configured to determine an open status or a close status of the thermostat and diagnoses whether there is a failure in the open status of the thermostat, using the temperature of the engine oil as an independent variable.
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