| 摘要 |
PURPOSE:To reduce the shock on speed change by means of freely reducing the back pressure of an accumulator by adjusting and controlling the line oil pressure and the back pressure for determining the characteristics of an accumulator by respectively independent control means. CONSTITUTION:Electromagnetic proportional valves SA and SL are controlled by a computer 84 into which the signals of a car speed sensor 82, etc. are input. A plurality of electromagnetic proportional valves SA control the back pressure of an accumulator 107 installed into an oil passage communicating to each frictional engaging device, and the electromagnetic proportional valves SL controls the line oil pressure in a hydraulic controller 86 through a primary regulator valve 103. The discharge pressure of a pump 112 acts onto the port 114L of the electromagnetic proportional valve SL, and a line oil pressure PL corresponding to the control oil pressure Ptheta is generated in the valve 103. Therefore, the line oil pressure can be controlled arbitrarily by controlling the load electric current IL supplied into a coil 108L by the instruction of the computer 84.
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