抄録
Improvement in the pump flow control performance in the low pressure side for the hydraulic variable displacement piston pumps using a sensor by making use of the variable gain method in the minor feedback system.
Variable gain method, in which the pressure monitoring signal of load pressure in the minor feedback system is added to the feedback system of flow control as the feedback compensation and flow gain of control amplifier is changed to the variable gain from the fixed gain.
As a result, the following improvements were achieved by this change.
1. In the low pressure side, the hysteresis performance was improved by 30% and repeatability was also enhanced.
2. Good results could be obtained from the flow response performance, especially the downward response in the minimum loaded pressure.
3. Concerning the pressure flow curve performance up to 5 MPa.the fluctuation of the controlled flow was decreased by using the dual gain amplifier method.
