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:
Sep. 10, 2002
Filed:
Mar. 01, 2002
Hiroshi Kubo, Saitama, JP;
Hiroshi Hashimoto, Saitama, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An oil temperature is estimated without using an oil temperature sensor to determine engine oil degradation, so that the number of parts may be reduced. To detect the engine oil degradation, an estimated engine oil temperature is worked out. When a process for working out the estimated engine oil is initiated (S ), it is determined whether a thermostat is in an OPEN state or in an CLOSED state (S ). Next, an initial oil temperature is worked out (S ), and then a target oil temperature is worked out (S ). Lastly, an estimated oil temperature is worked out (S ), and the process is completed (S ). When the estimated oil temperature is worked out in step S , alternative process steps may be selected according to the OPEN/CLOSED state of the thermostat.