| 摘要 |
<p>Flow-pressure compensated valves are employed in the servo-systems for variable displacement pumps to maintain pump discharge pressure above a minimum pressure level and also above the load pressure in a fluid actuator. The utilization of multiple pumps in a particular fluid circuit, each functioning to charge a separate fluid actuator, dictates the need for closely controlling the displacements of the pumps simultaneously to obtain maximum performance efficiency from the prime mover for the pumps. It is further desirable to provide a control system which minimizes the total pump envelope size. The improved fluid circuit (10) of this invention includes a summing valve (22) for creating a control signal (PC) in response to the collective pump pressure signals (PP) in a plurality of fluid actuators (13) and a control arrangement (36) for controlling modulation of flow-pressure compensated valves of the above type in response to variations in the control signal (PC). </p> |
