Depth-based bidirectional dead zone compensation method of hydraulic proportional valve

Abstract

The invention discloses a depth-based bidirectional dead zone compensation method of a hydraulic proportional valve, and relates to the technical field of machinery and electronics. The depth-based bidirectional dead zone compensation method of the hydraulic proportional valve comprises the following steps that the magnitude relation between a control signal u<c> and a right dead zone depth Dep<r>of the proportional valve; when u<c> is greater than or equal to 0, an automatic compensation control command signal u<act> of the proportional valve is decreased progressively based on the law of u<act>= u<c>+u<r-est>, when u<c> is greater than or equal to Dep<r> and less than 0, the proportional valve still works in the right position without reversing, u<act> is calculated as per formula; whenu<c> is less than Dep<r>, and the u<act> is calculated according to the formula of u<act>= u<c>+D<l-est>+U<r>, wherein the U<r> is equal to MAX(int(u<c>-Dep<r>)dt, Dep<r>)-Dep<r>; the reverse commutation of the proportional valve is the same as the principle, but compensation is based on the depth D<epl> of a left dead zone of the proportional valve and an estimated value of the left dead zone ofthe proportional valve. Since the depth-based bidirectional dead zone compensation method of the hydraulic proportional valve extends into the dead zones separately on the basis of the estimated values of the dead zones until change intervals of the dead zones are exceeded to ensure complete entry into the dead zones of the proportional valve, the problems of poor dynamic performance, easy fluctuation and difficulty in meeting requirements for an accurate closed-loop control system are solved.

Description

technical field [0001] The invention relates to the technical field of mechatronics, and more specifically relates to a depth-based bidirectional dead zone compensation method of a hydraulic proportional valve. Background technique [0002] With the development of hydraulic technology, hydraulic transmission is more and more widely used in construction machinery and machine tools at home and abroad. Any kind of mechanical hydraulic transmission system should meet the requirements of light weight, small size, simple structure, convenient use, high efficiency and good quality. Basically, advanced technology should be adopted as much as possible. [0003] In the actual application process, it is found that the proportional valve in the hydraulic proportional control system has variable dead zone characteristics, and the existence of the proportional valve dead zone will affect the control accuracy and dynamic quality of the closed-loop control system. The current common dead ...

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Problems solved by technology

[0005] The embodiment of the present invention provides a depth-based hydraulic proportional valve two-way dead zone compensation method to solve the problem of poor dynamic performance and easy fluctuations in the prior art. It is difficult to meet the requirements of the precise closed-loop control system

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