PWM (Pulse Width Modulation) control method and system for prolonging service life of array high-speed switch valve

Abstract

The invention discloses a PWM (Pulse Width Modulation) control method and system for prolonging the service life of an array high-speed switch valve, a PWM controller is used for controlling the working state of the array high-speed switch valve consisting of a first switch valve, a second switch valve and a third switch valve which have the same flow gain and are arranged in parallel, and the method specifically comprises the following steps: (1.1) averagely dividing a control quantity u into three ranges, each range is correspondingly provided with a mode, including a mode I, a mode II and a mode III; the control quantity is a PWM (Pulse Width Modulation) signal duty ratio for controlling the average output flow of the array high-speed switch valve; (1.2) in each mode state, the PWM signal duty ratio of each switching valve in the array high-speed switching valves is distributed, and the working state of each switching valve is constructed according to the distributed duty ratio; the total switching frequency of the array high-speed switch valve can be reduced, and the service life of the array high-speed switch valve is prolonged.

Description

technical field [0001] The invention relates to the field of digital hydraulic control, in particular to a PWM control method and system for improving the service life of an array high-speed switching valve. Background technique [0002] The digital hydraulic system is divided into two types, one is to use a single high-speed switching valve as the control element, and realize the flow regulation through the pulse width modulation (PWM) control method; the other is to use the array high-speed switching valve as the control element, through pulse coding Modulation (PCM) control method to achieve flow regulation. Compared with the high-speed switching valve, the array high-speed switching valve can take into account both large flow and high dynamics at the same time. However, due to the use of PCM control method, due to the step-level speed regulation in essence, there must be quantization errors, so the control accuracy is difficult to further improve. [0003] Applying the ...

AI Technical Summary

Problems solved by technology

However, in the PWM control mode, all the switching valves in the high-speed switching valve array are in the high-frequency switching state, that is, the valve core and the valve seat are constantly hitting at high speed, which causes vibration, noise, valve port wear and coil damage. Accelerated aging and other issues, which will seriously reduce the service life of the array high-speed switching valve

Secondly, due to the inconsistent switching times of each switching valve, the performance attenuation of each switching valve is different, which has an adverse effect on later maintenance

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