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:
Jan. 06, 1998
Filed:
Feb. 29, 1996
Hideo Furukawa, Wako, JP;
Tatsuyuki Ohashi, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A vehicle automatic transmission control system in which the clutch is controlled in a slipping state if a torque converter is locked up when the gear shift command is not output. When the engine speed fluctuates, the fluctuations pass through the transmission and wheels and act on the ground to produce a reaction which passes back through the wheels and vehicle body and acts on the passengers as surging. In the prior art, this surging is prevented by slip-controlling the lockup clutch. This complicates the hydraulic control circuit. In the subject control, therefore, the clutch is slip-controlled even when no gearshift is in progress so as to absorb surging by slipping the clutch, not by the torque converter as in the prior art. As a result, it suffices to control the lockup clutch L of the torque converter between only two positions, one for complete lockup and one for complete release, rendering the structure of the hydraulic control circuit simple.