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:
Feb. 14, 1989
Filed:
Oct. 06, 1986
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A vehicle automatic transmission includes a torque converter which has a rotational power output member, and also includes a gear transmission mechanism. This gear transmission mechanism includes; a friction engaging mechanism; first and second rotational power input members; a first clutch which selectively engages the torque converter rotational power output member to the first rotational power input member; and a second clutch which selectively engages the torque converter rotational power output member to the second rotational power input member. When the torque converter rotational power output member is rotating the first rotational power input member via the first clutch, the gear transmission mechanism is enabled to provide its first speed stage, while, when the torque converter rotational power output member is rotating the second rotational power input member via the second clutch, the gear transmission mechanism is enabled to provide a speed stage other than its the first speed stage in cooperation with the engagement operation of the friction engaging mechanism. The rotational speed of the rotational power output member of the torque converter is detected, when the first clutch is disengaged and the second clutch is engaged, by taking it as being the rotational speed of the second rotational power input member of the gear transmission mechanism. A system is also disclosed for performing the method.