| 摘要 |
PROBLEM TO BE SOLVED: To ensure the self-actuated travelling of a vehicle by comprising a failure safe means for supplying the oil pressure to at least two arbitrary oil pressure servos in a case where the failure is occured in a solenoid valve relative to the control of the hydraulic servos mounted corresponding to a plurality of transmission stages. SOLUTION: When the failure is occured in a first solenoid valve of a B-1 control valve the oil pressure in an oil passage L-25 is supplied to a second B-1 apply control valve 62. As the C-1 control pressure Pc1 is supplied to the hydraulic servo C-1 in a first speed stage, the B-1 apply control valve 62 is located on a left half position by the pressure Pc1 supplied through an oil passage L-66, and the oil passages L-67 and L-71 are communicated to one another. The first B-1 apply control valve 71 is not switched, the oil passages L-72 and L-83 are communicated to one another, the oil pressure is supplied to the hydraulic servo B-1, a first brake is engaged, and a second speed is estabilished.
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