Application Number: 00118136
Application Date: 2000.06.09
Publication Number: 1277332
Publication Date: 2000.12.20
Priority Information: 1999/6/10 JP 163364/1999
International: F16H61/12
Applicant(s) Name: Honda Giken Kogyo K. K.
Address:
Inventor(s) Name: Asatsuke Masashi;Ohashi Tatsuyuki;Wakamatsu Eiki
Patent Agency Code: 11038
Patent Agent: chen jian
Abstract A control system for an automatic transmission comprises a plurality of shift valves 60 to 68, which are used for controlling the supply and drain of hydraulic oil to and from a plurality of clutches 11 to 15 provided to select power transmission paths, respectively, in a parallel shaft speed change mechanism TM. This control system further comprises a forward/reverse selection hydraulic servomechanism 70, a D inhibitor valve, which controls the supply of a line pressure to the servo-oil chambers of this servomechanism, and a plurality of solenoid valves, which are used for controlling the actuation of the shift valves and the D inhibitor valve. This control system comprises a first neutral mode and a second neutral mode for a neutral range. In the first neutral mode, the D inhibitor valve is switched to a forward drive position, and the forward drive servo-oil chamber is connected to a drain. In the second neutral mode, the D inhibitor valve is switched to a reverse drive position, and the forward drive and reverse drive servo-oil chambers are both connected to the drain.