| 摘要 |
<p>The present invention relates to a hydraulic circuit comprising: multiple solenoid valves where a normal opened type and a normal closed type equipped in a hydraulic line are mixed to control hydraulic pressure supplied to multiple friction elements equipped in a transmission; a manual valve connected with a lever and a cable arranged in a driving seat of a vehicle having the transmission, and connected with or blocked by at least one solenoid valve of the normal opened type according to lever operation; and a switch valve mounted on the gap between the solenoid valve of the normal closed type and the friction element to connect the solenoid valve of the normal closed type with the friction element, operated by the hydraulic pressure supplied from the manual valve to block the solenoid valve of the normal closed type and the friction element, and to connect the manual valve with the friction element. Multiple friction elements are in the operating state corresponding to R stage, N stage, and D stage according to lever operation, when power applied to the multiple solenoid valves is blocked. Therefore, provided is the hydraulic circuit for the transmission running forward/reverse in a limp home mode state capable of mechanically running forward and backward by controlling the manual valve according to the lever operation, even if power supplied to the transmission is blocked.</p> |
