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:
May. 09, 1989
Filed:
Mar. 17, 1987
Nobuyuki Isono, Toyota, JP;
Aisin Seiki Kabushikikaisha, Aichi, JP;
Abstract
A control system for an automatic variable speed transmission accesses reference data for a down/up shift operation stored in a memory as a function of a particular speed range and a throttle opening. The data read from the memory is compared against a prevailing vehicle speed to determine the need for a down/up shift operation. The reference data includes a first set which is used for determining the need for a down/up shift operation, and a second set which is used in determining the need for a down shift operation when a rapid braking action is applied. When a brake pedal is depressed and the deceleration of the vehicle exceeds a given value, the need for a down operation is determined only utilizing the second set until the brake pedal is released, thus allowing the transmission to shift down to a lower speed range at a relatively higher vehicle speed.