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:
Jun. 13, 2000
Filed:
Jan. 06, 1999
Yoshiyuki Onimaru, Nagoya, JP;
Masato Shimei, Nagoya, JP;
Takanao Suzuki, Hekinan, JP;
Yasuo Shirai, Toyota, JP;
Atuo Okumura, Toyota, JP;
Takahiro Sakai, Toyota, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A shift control unit which improves the shift feeling of an automatic transmission includes an operation control device for placing a frictional engaging element in a slow drain state during a timing time decided by a timing time deciding device and in a quick drain state when the timing time has elapsed. The shift control unit is provided further with a computing device for computing the power-off engine speed necessary for outputting a small range upper limit value of a turbine torque from a number of revolutions of the turbine of the torque converter and from the performance characteristic of the torque converter, and an auxiliary operation control device for comparing the power-off engine speed and actual engine speed and for running the operation control device when the actual engine speed is equal to or greater than the power-off engine speed to place the frictional engaging element into the quick drain state immediately without running the operation control device when the actual engine speed is below the power-off engine speed.