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. 28, 1998
Filed:
Mar. 03, 1997
Randy R Hayward, Mapleton, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A shift control strategy is provided for an automatic transmission used in a machine that is started or operated with cold oil in the transmission. When the operating value of the oil in the transmission is below a predetermined level, as sensed by a temperature sensor or a viscosity sensor, a controller turns on an indicator lamp. When a shift lever is moved from the neutral position or moved to select a different direction of travel, the controller detects the amount of time the shift lever has been in the neutral position or out of the one direction of travel and compares the amount of time to a predetermined amount of time. If the amount of time is less than the predetermined amount of time, the controller flashes the indicator lamp, inhibits the engagement of the clutches for the desired gear ratio or new travel direction, and requires the shift lever be moved back to the neutral position.