A Differential Control Pilot Valve Device

Abstract

The invention belongs to the technical field of fluid drive and particularly relates to a pilot valve device with differential control. The pilot valve device comprises a pilot valve body, an electrical-mechanical converter, valve bush driving rods and valve element driving rods, and further comprises a signal collecting and processing unit. The signal collecting and processing unit comprises a valve element displacement sensor, a valve bush displacement sensor, a valve element and valve bush displacement differential subtractor, a given feedback signal computing subtractor, a displacement (opening degree) given signal generator, a displacement (opening degree) signal converter, a voltage signal adjustor, a PWM signal generator, an electromagnet voltage signal transformer, a differential voltage amplifier, a valve element winding external wire, a valve bush winding external wire, a current signal sampler and a U' / U signal converter. Parameters of the electrical-mechanical converter element of a pilot valve are collected online in real time, and motion parameters of the pilot valve are controlled through valve element displacement differential signals and valve bush displacement differential signals, so that the purposes of increasing the dynamic response speed of the pilot valve and improving the sensitivity and precision of opening degree control signals of the pilot valve are achieved.

Description

technical field [0001] The invention belongs to the technical field of fluid transmission, and specifically relates to a differential control pilot valve device. The device collects the parameters of the electromechanical converter components of the pilot valve on-line in real time, and uses the differential signal of the displacement of the valve core and the valve sleeve to control the pilot valve. The motion parameters of the valve are controlled to achieve the purpose of improving the dynamic response speed of the pilot valve and its opening control sensitivity and precision. Background technique [0002] The pilot valve is one of the widely used components of the electro-hydraulic control system. It is mainly composed of a pilot valve and an electromechanical converter, integrating mechanical, electronic, hydraulic and other components. At present, for the large-flow proportional flow valve adopting the pilot control mode, the control principle adopted is based on the p...

AI Technical Summary

Problems solved by technology

[0003] In order to improve the response characteristics and control accuracy of the pilot valve, the existing research has carried out research on the electromagnetic, mechanical structure, and control strategy of the pilot valve. However, the existing methods focus on the improvement of a single parameter, and the performance improvement of the valve is limited.

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