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:
Mar. 10, 1992
Filed:
May. 15, 1991
Keiji Bota, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An automatic transmission containing a multi-stage shift mechanism composed of a planetary gear mechanism is arranged to change the output of the combustion engine in synchronization with its shift operation. The planetary gear mechanism is connected to the output shaft of the combustion engine through the torque converter and is so arranged as to assume four forward speed stages by coupling or uncoupling plural friction coupling elements such as clutches, etc. The number of revolutions of input of the planetary gear mechanism is detected through a sensor by detecting the number of revolutions of the turbine, and the number of revolutions of its output is likewise detected by a sensor. The output of the combustion engine is reduced by retarding the ignition timing as the shift operation is regarded as having been started when a difference between the virtual number of turbine revolution calculated on the basis of the speed stage prior to the shift and the actual number of turbine revolution becomes equal to or larger than a given value. The shift operation is regarded as having been ended when the difference becomes lower than the given value and the reduction of the output of the engine is released.