A RESEARCH ON THE ELECTROHYDRAULIC PROPORTIONAL CONSTANT PRESSURE AND FLOW PUMP WITH ELECTRIC FEEDBACK AND COMPENSATION

Abstract

A new type of electrohydraulic proportional constant pressure and flow pump with electric feedback and compensation is introduced in this paper. The pump control system has be designed to realize constant pressure control by load pressure electric feedback and constant flow control by leakage flow compensation. A new principle of leakage flow electric compensation to pump constant flow control is proposed in this paper. Unlike conventional constant flow pump, which directly detects the load flow on the main oil-road, the additive main flow throttle loss may be avoided completely. The structure characteristics of the pump control system and experimental research results also are introduced in this paper.