| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuously variable transmission controller which ensures the minimum running function by a simple and low-cost configuration. SOLUTION: An oil passage 56 branched from a control output port oil passage 53 of a solenoid valve 12 is led to a fail-safe valve 13 to control pressure in an oil passage 69 in accordance with pressure of an oil passage 58 branched from an oil passage 57. Moreover, pressure of the oil passage 57 is introduced into a primary pressure control valve 19 to control pressure of an oil passage 68 by pressure of an oil passage 80 and the oil passage 57. When output pressure of the solenoid valve 12 drops below a specified value and a failure occurs, the fail-safe valve 13 is changed over to the right position so that pressure of an oil passage 55 and an oil passage 51 which detour the solenoid valves 12 and 11 is communicated with the oil passage 57 and the oil passage 80. As a result, it is possible to transmit large torque because primary pressure and secondary pressure are controlled in such a manner that they become the maximum values. Consequently, it is possible to ensure tensile force of a belt which hardly obstructs actual running at the time of fail and ensure the minimum running function. |
