| 摘要 |
A linear solenoid valve SLC3 is formed by a normal open type, and even when non-energizing occurs, the engaging pressure of a clutch C-3 is output. A first clutch apply relay valve 121 outputs a first preliminary hydraulic pressure in forward first to third speeds based on the engaging pressure of a clutch C-2, and outputs a second preliminary hydraulic pressure in forward fourth to sixth speeds. Then, during normal operation, a second clutch apply relay valve 122 supplies controlled pressure of linear solenoid valves SLC1, SLC2 to hydraulic servos 41, 42, respectively, while it supplies a first preliminary pressure P DC1 or second preliminary hydraulic pressure P DC2 to the hydraulic servos 41, 42 at all-off failure, thereby engaging a clutch C-1 or the clutch C-2 and achieving the forward third speed or forward fifth speed. In other words, while a low speed or high speed can be provided at all-off failure, compactness and cost reduction can be achieved. |
