| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize good acceleration performance during restart, etc. while suppressing sudden deceleration, when failure occurs in power distribution to a solenoid valve in a hydraulic control circuit of an automatic transmission. <P>SOLUTION: A hydraulic control device includes: a solenoid valve 103 for reducing and outputting a control pressure based on a line pressure while the power is distributed; and a high cut valve 114 capable of switching between a first state for supplying the line pressure to a high clutch 50 for achieving a predetermined high-speed stage, and a second state for supplying the line pressure to a low clutch 40 for achieving a predetermined low-speed stage. When power distribution failure occurs, the high cut valve 114 is maintained in the first state to allow traveling at the high-speed stage, during traveling in a D range, while, upon switch to an N range, the control pressure output from the solenoid valve 103 is changed and the high cut valve 114 is switched to the second state, and thereby the low-speed stage is achieved during restart in the D range, etc. <P>COPYRIGHT: (C)2013,JPO&INPIT |
