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:
Dec. 18, 1990
Filed:
Jan. 19, 1989
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of shift control in an automatic transmission having a torque converter and a shift-gear mechanism, wherein a shift map has a shift-up line and a shift-down line between each gear ratio change which is used to conduct the shift control, with a hysteresis zone being established between each shift-up line and the shift-down line. The method includes the steps of shifting down a speed range when a point representing a traveling state on the shift map moves in the lower vehicle speed direction and crosses the shift-down line, shifting up a speed range when the point moves in the higher vehicle speed direction and crosses the shift-up line, and shifting down the speed range when the point is in the hysteresis zone after a ratio of the torque converter has been shift and also the speed below a threshold level for more than a predetermined time.