| 摘要 |
<p>In a hydraulic apparatus for an automatic transmission having a torque converter (20) with a lockup clutch (20c) and a CVT, there are provided a first control valve (124) for controlling supply of the hydraulic pressure to the lockup clutch oil chamber (20c1), a first electromagnetic solenoid valve (142) for controlling operation of the valve (124), a second control valve (94) for controlling supply of the hydraulic pressure to the CVT pulleys (30, 32), a second electromagnetic solenoid valve (104) for controlling operation of the second valve (94), a switching valve (150) interposed between the oil chamber (20c1) and the valve (124). In the apparatus, when detecting that the valve (124) or valve (142) is failed and the lockup clutch is locked in engaged condition, current supply to the second valve (104) is stopped so that it operates the switching valve (150) to disengage the lockup clutch, thereby enabling to forcibly release the engagement without manipulation by the operator.</p> |
