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. 30, 1997
Filed:
Apr. 24, 1996
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In a control apparatus for controlling a gear shift ratio of a continuously variable transmission mounted in an automotive vehicle as an automatic power transmission, a gear shift ratio command value is calculated using a control constant corresponding to a dynamic characteristic determined for each instantaneous gear shift ratio of the continuously variable transmission so as to achieve a target gear shift ratio response characteristic. In addition, a disturbance compensator (robust compensator) of a robust type filter is used against a disturbance such as a parameter variation to achieve a gear shift ratio control characteristic that a designer of the control apparatus has desired to achieve in cases where the parameter variation occurs due to a load variation, a change in an environment temperature or deterioration of an oil viscosity in a hydraulic pressure mechanism which creates a pressing force on each of drive and driven pulleys of the continuously variable transmission and where an individual difference in the dynamic characteristic of the continuously variable transmission due to a working and/or assembly accuracy of a power transmission part of the continuously variable transmission occurs.