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:
Nov. 26, 1996
Filed:
Sep. 14, 1994
Naonori Iizuka, Fuji, JP;
Jatco Corporation, , JP;
Abstract
A gear control means determines the gear position of an automatic transmission based on a vehicle speed V and throttle opening T input from a vehicle speed sensor and throttle opening sensor, and on a predetermined gear change-over lines which take form of kinked lines expressing 'vehicle speed/throttle opening' characteristics for up-shifting and down-shifting respectively. The gear control means is provided with a memory unit and a gear determining unit. To increase the freedom in setting the gear change-over lines, the memory unit first stores the coordinates (x1i, y1i) and (x2i, y2i) of the two ends of each of the linear portions forming the kinked lines, and the gear determining unit selects the linear portion for which the expression x2i>V is satisfied and having the minimum value of x2i, and determines that a shift to higher gear position should be made if the condition (T-y1i) (x2i-x1i)<(V-x1i)(y2i-y1i) occurs with respect to a kinked line for up-shifting, or that a shift to lower gear position should be made if the condition (T-y1i)(x2i-x1i)>(V-x1i)(y2i-y1i) occurs with respect to a kinked line for down-shifting.