| 摘要 |
A line pressure control system for an automatic power transmission capable of maintaining a line pressure at proper levels in response to the engine output torque and the torque convertor turbine speed during gear shift operation. When gear shifting is to be effected, a gear shift indicating signal is applied to a command which allows a signal corresponding to the proper line pressure to be applied to a line pressure regulating means. During a time interval starting at the occurrence of the gear shift operation, the proper line pressure depending upon the output torque and turbine speed is applied to the transmission and upon termination of the time interval a higher line pressure is applied thereto.
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