| 摘要 |
PURPOSE:To obtain the stable and smooth operation to change speed in an automatic transmission by changing the control pressure of the operation oil running in oil-pressure servo-devices in accordance with the characteristic of the operation oil. CONSTITUTION:Speed is changed automatically by engaging and disengaging a main clutch 1 and supplying oil pressures to oil-pressure servo-devices 17, 20, and 23. The pressurized oil pumped up by a pump 25 is regulated at an almost fixed pressure by an oil pressure regulation valve 26, and brought to an oil-pressure line 27. By electrically controlling control valves 28, 29, and 36, the pressurized oil is supplied to fixed oil-pressure servo-devices 17, 20, and 23. In the pressurized oil supplied to the oil-pressure line 27, the discharge is detected by a fixed orifice 52, and the change of the operational characteistic caused by the change of temperature and the like can be obtained. In accordance with the change of this discharge, the oil pressure added to oil-pressure servo-devices 17, 20, and 23 are regulated. |
