Method, device and system for speed regulation control of electro-hydraulic proportional valve and engineering machinery equipment

Abstract

The invention discloses a method, a device and a system for speed regulation control of an electro-hydraulic proportional valve and engineering machinery equipment. The method comprises the following steps of: receiving expected speed; and comparing the expected speed with prestored actual speed, determining actual speed, and inputting a PWM (Pulse-Width Modulation) signal and a chatter signal into the electro-hydraulic proportional valve, wherein the difference of the actual speed and the expected speed is in an intended scope, the PWM signal is provided with the frequency and the duty ratioof a PWM signal corresponding to the actual speed, and the chatter signal is provided with the frequency and the amplitude of a chatter signal corresponding to the actual speed. According to the invention, most or all regulation processes of the PWM signal and the chatter signal according to difference between the actual speed and the expected speed can be omitted, and the response speed and the degree of linearity of the electro-hydraulic proportional valve are improved.

Description

technical field [0001] The invention relates to the field of proportional valve control, in particular to a method, device, system and construction machinery equipment for speed regulation control of an electro-hydraulic proportional valve. Background technique [0002] The electro-hydraulic proportional valve is a hydraulic control valve between the hydraulic valve and the electro-hydraulic servo valve. The electro-hydraulic proportional valve receives an external control signal, and adjusts the displacement of the spool according to the control signal, so that the valve opening is consistent with the control signal. The strength of the electro-hydraulic proportional valve changes proportionally, and the medium passing through the electro-hydraulic proportional valve is effectively adjusted, and finally the precise control of the system using the electro-hydraulic proportional valve is realized. [0003] At present, the pulse width modulation signal (PWM signal) is often us...

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Problems solved by technology

[0007] However, in figure 1 In the method shown, the PWM signal and the tremor signal are adjusted by the corresponding analog circuit generator, which has low precision and large error, and does not form a complete system with each other, especially the characteristics of the electro-hydraulic proportional valve. When the external factors change, the existing technology is difficult to track in real time, the adjustability and adaptability are poor, and the improvement of the response speed and linearity of the electro-hydraulic proportional valve is limited.

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