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. 02, 2006
Filed:
Sep. 26, 2003
Tateki Jozaki, Kanagawa-ken, JP;
Shigeru Ishii, Kanagawa-ken, JP;
Tatsuo Wakahara, Kanagawa-ken, JP;
Masahiro Yamamoto, Kanagawa-ken, JP;
Hiroyasu Tanaka, Kanagawa-ken, JP;
Shigeki Shimanaka, Kanagawa-ken, JP;
Midori Yamaguchi, Kanagawa-ken, JP;
Tateki Jozaki, Kanagawa-ken, JP;
Shigeru Ishii, Kanagawa-ken, JP;
Tatsuo Wakahara, Kanagawa-ken, JP;
Masahiro Yamamoto, Kanagawa-ken, JP;
Hiroyasu Tanaka, Kanagawa-ken, JP;
Shigeki Shimanaka, Kanagawa-ken, JP;
Midori Yamaguchi, Kanagawa-ken, JP;
JATCO Ltd, , JP;
Abstract
A speed change ratio control unit for a continuously variable transmission that uses a step motor as a driving actuator of a speed change control valve that compares a variable ASTP representing a step position of the step motor and a step position BSTP of the step motor that is necessary for realizing a desired speed change ratio at every predetermined operation cycle, and if ASTP≠BSTP is satisfied determines that a step-out has occurred on the step motor.