| 摘要 |
Flow from a pressure source is bidirectionally conducted to a prime-mover driven, bidirectional, positive displacement pump and in-series flow restrictions; the pressure source and flow restrictions functioning to provide the reference flow rate; the pressure gradient across said pump bidirectionally signalling the error in prime-mover speed. Means responsive to said pressure gradient provide proportional plus integral control of the prime-mover speed. The reference flow rate is controlled by a four-way valve. Load compensation of the four-way valve is provided to obtain high error signals.
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