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. 12, 2002
Filed:
Jul. 18, 2000
Tatsuyuki Ohashi, Wako, JP;
Shouji Asatsuke, Wako, JP;
Hideki Wakamatsu, Wako, JP;
Takayuki Yamaguchi, Wako, JP;
Takamichi Shimada, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An automatic transmission comprises a plurality of clutches which are provided to select power transmission paths, respectively, in a parallel shaft speed change mechanism TM and a plurality of shift valves which are used for controlling the supply and drain of hydraulic pressure to and from these clutches. For this automatic transmission, a control system comprises a forward/reverse selection hydraulic servomechanism 70 and a plurality of solenoid valves which are used for controlling the supply and drain of a line pressure so as to control the actuation of these shift valves and the forward/reverse selection hydraulic servomechanism. The system further comprises a hydraulic switch which detects the hydraulic pressure supplied into the right side oil chamber of the forward/reverse selection hydraulic servomechanism and a hydraulic switch which detects the hydraulic pressure of the SECOND speed clutch whose pressure is generated from the pressure in the right side oil chamber The system determines whether the forward drive range is set correctly or not, based on a result of pressure detection by these hydraulic switches and