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. 24, 1996
Filed:
Dec. 18, 1992
Scott M Thompson, Zionsville, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A method and apparatus as presented for monitoring the condition of oil in a transmission to present a service indicia prior to the time that the oil life has been spent. A thermosensor and a tachometer are associated with the transmission to present respective output signals correlated with operating temperature and transmission revolutions. The revolutions of the transmission are weighted as a function of the deviation of the temperature from a temperature standard. The resulting effective revolutions are then applied to a down counter which is initially loaded to the number of allowable effective revolutions when the transmission oil is changed or the transmission serviced. When the down counter has counted out, a message is displayed indicating the need for service.