Digital pump control valve and method for variable control of hydraulic pump

Abstract

The invention relates to a digital pump control valve and method for variable control of a hydraulic pump. A servo motor in the digital pump control valve is mounted on a pump control valve shell; the servo motor is connected with the rotary valve element through the cross coupling and used for transmitting the rotating angle of the servo motor to the rotary valve element. The rotary valve element and the rotary valve sleeve are sleeved together in a clearance mode, and the rotary valve element can rotate in the rotary valve sleeve. A rotary valve sleeve and a ball screw are sleeved into a whole in an interference mode to form a rotary valve structure, the ball screw is connected with a shifting fork through a lead screw nut and a shifting fork sleeve, the shifting fork is connected with a variable push rod in a hydraulic pump variable mechanism, the variable push rod drives axial movement of the lead screw nut to be converted into rotary movement of the ball screw, and therefore a rotary valve element is driven to rotate synchronously. And mechanical feedback of motion is realized. Switching of a valve port of the rotary valve is achieved through rotation angle input of the servo motor, mechanical feedback of the ball screw is adopted, the variable push rod is controlled to rapidly and accurately reach the position, and therefore rapid and accurate control over the displacement of the oil pump is achieved.

Description

technical field [0001] The invention relates to a fluid mechanical control valve, in particular to a digital pump control valve for variable control of a hydraulic pump (or a hydraulic motor). Background technique [0002] In the field of fluid transmission, hydraulic oil pump, as the core power source, has always been the key research object of this professional engineering and technical personnel. The high-response and high-precision displacement control of hydraulic pumps is one of the important research directions. In particular, the concept of digital hydraulics is becoming more and more popular, and the demand for digital interfaces and direct computer control is also increasing. Although some breakthroughs and applications have been achieved in some industrial fields with low requirements for control accuracy and environment, relying on imitation research and basic material research, but in some high-end industrial and mobile hydraulic applications, they still rely on...

AI Technical Summary

Problems solved by technology

For the proportional hydraulic pump with this structure, when the control oil passes through the proportional valve, a relatively large throttling loss will occur. The temperature and viscosity of the control oil will also affect the response and control accuracy. The requirements for the control algorithm are relatively high and the difficulty is relatively large.

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