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:
Jul. 20, 2004
Filed:
Sep. 28, 2001
Martin Roy Haggett, Rugby, GB;
William Richard Hutchins, Kenilworth, GB;
Michael Krauss, München, DE;
Other;
Abstract
A vehicle ( ) is disclosed which includes a thermostat ( ) in a bottom hose ( ) of a radiator ( ). An onboard diagnostic arrangement is provided to monitor the efficiency of the thermostat ( ). Temperature sensors (S , S ) are provided to monitor the temperature of the coolant across the radiator ( ) so that a controller ( ) can derive from those measurements the temperature differential across the thermostat ( ). If the temperature T of the coolant at the thermostat inlet is below the thermostat opening temperature T and the differential temperature between the thermostat inlet temperature T and the thermostat outlet temperature T is below a fault threshold D , the thermostat ( ) is evaluated as being stuck open or leaking, which results in a fault being recorded and a malfunction indicator lamp (MIL) being illuminated.