| 摘要 |
A hydraulic motor control system comprises a speed control loop and a pressure control loop which provide closed loop control of a variable displacement chamber space and the mechanical advantage coupling thereof to the motor output shaft. The speed control loop is effective in the speed control mode of operation to maintain a set speed within a given load range. In response to load increases beyond said range, the pressure control loop pre-empts the speed control loop so that the control operates in a constant horsepower mode.
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