| 摘要 |
PCT No. PCT/JP87/00454 Sec. 371 Date Mar. 1, 1988 Sec. 102(e) Date Mar. 1, 1988 PCT Filed Jun. 30, 1987 PCT Pub. No. WO88/00304 PCT Pub. Date Jan. 14, 1988.A reverse shift control device of an automatic transmission prevents reverse running of the automatic transmission, even though a manual shift lever is set to a reverse range, when the vehicle runs at more than a predetermined speed. Certain shift valves have ports to which line pressure is applied from the manual valve when set to reverse, and also have ports which communicate with a hydraulic servo of a frictional engaging component which is engaged when the vehicle travels in reverse. When the manual valve is set to reverse and the vehicle speed is more than a predetermined speed (for example, 7 km/h), respective pairs of the ports are disconnected due to the shifting of the shift valves based on the signal issued by a controller. |
