| 摘要 |
<p>A hydraulic fluid pressure control system comprises: a hydraulic pump motor (2) having an electrical input configured to receive an AC input signal and a hydraulic fluid output configured to output a pressure proportional to the frequency of the AC input signal, and an electronic control circuitry (8) connected to said electrical input; wherein said electronic control circuitry (8) provides an AC input signal of variable frequency.</p> |
