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. 09, 1986
Filed:
Oct. 31, 1984
Applicant:
Inventors:
Kazutoshi Nobumoto, Hiroshima, JP;
Shizuo Sumida, Hiroshima, JP;
Assignee:
Mazda Motor Corporation, Hiroshima, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60K / ;
U.S. Cl.
CPC ...
74866 ; 74867 ; 474 28 ;
Abstract
A steplessly variable vehicle transmission of a belt-pulley type which is provided with an electronic control unit for controlling the speed ratio of the transmission in accordance with the engine operating condition, such as the engine load and the engine speed. The control unit has a shift control map which includes a shift-up zone, a shift-down zone and a speed ratio hold zone between the shift-up and shift-down zones so that the speed ratio of the transmission is maintained constant in acceleration and deceleration as long as the engine operating condition is in the hold zone.