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:
Apr. 15, 1997
Filed:
Oct. 04, 1995
Katsumi Kono, Toyota, JP;
Shinya Nakamura, Owariasahi, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An apparatus for controlling a lock-up clutch between pump and turbine impellers in a power transmitting system of a motor vehicle, including a slip control device for controlling the amount of slip of the lock-up clutch, and a judder detector for detecting a judder of the lock-up clutch based on the number of detected speed variations of the turbine impeller during slip control of the lock-up clutch by the slip control device, wherein the judder detector is inhibited from using a variation of the turbine impeller speed variation for the detection of the judder, if the amount of change of the variation amplitude is larger than a predetermined threshold or if the period of the variation is outside a predetermined range. The judder detector is preferably arranged to operate on the basis of the variation amplitude of the turbine impeller speed as compared with the variation amplitude of the output speed of an automatic transmission multiplied by the actual speed ratio of the transmission, or on the basis of a phase difference between the variation waveforms of the turbine impeller and transmission output speeds.