| 摘要 |
PROBLEM TO BE SOLVED: To establish high and low two shift stages in system down without switching a position of a manual valve 5 between an automatic transmission range and a manual transmission range even in the case where the automatic transmission range and the manual transmission range are selectable as a forward travel range. SOLUTION: This controller has a switch valve 15 capable of being switched to a condition for controlling a shift control valve 61 for low speed stage by a normally opened type solenoid valve 72 capable of normally controlling a shift control valve 62 for high speed stage. An oil path L17 for switching the switch valve 15 to a condition for controlling the shift control valve 61 by the solenoid valve 72, is connected to an oil path L11 on the output side of the solenoid valve 72 at a 'P' position or an 'R' position. When the system down is generated during the forward traveling in a state that the manual valve 5 is located at the 'D, M' positions as the forward travel range, a high-speed stage is established by the signal pressure of high pressure of the solenoid valve 72. When the manual valve 5 is switched to the 'R' position as the backward travel range position and the 'P' position as a parking range position in system down, the switch valve 15 is switched to the condition mentioned above by the signal pressure of high pressure of the solenoid valve 72, and then the low-speed stage is established by switching the manual valve 5 to the 'D, M' position.
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