Self-adaptive control system of proportional valve and control method

Abstract

The invention discloses a self-adaptive control system of a proportional valve. The self-adaptive control system comprises a controller, wherein an input end of the controller is accessed into a feedback port of the proportional valve, and receives a control signal on the proportional valve; the controller carries out signal processing and output judging by combining the input control signal with a feedback signal of the proportional valve, and outputs a PWM signal; the PWM signal is used as an input signal of the proportional valve for being acted on the proportional valve, so that pressure flow displacement is formed from an electronic amplifier in the proportional valve to an electrical-mechanical converter, and the feedback signal is formed by an electrical detecting feedback mechanism in the proportional valve for being input to the controller; and the controller monitors and regulates the output PWM signal in real time, so that the PWM signal reaches the predetermined reasonable and stable control effect and then is acted to a hydraulic performing element. The invention further discloses a control method. According to the system and the method, the flow output of the proportional valve is in a stable state all the time, and is not affected by other factors, so that the controlled actions of the proportional valve are stable and precise.

Description

technical field [0001] The invention relates to a proportional valve, in particular to a proportional valve adaptive control system and a control method. Background technique [0002] There are many types of hydraulic valves, including ordinary hydraulic valves and special hydraulic valves, and special hydraulic valves include electro-hydraulic servo valves and electro-hydraulic proportional valves. Among them, the electro-hydraulic proportional valve is a hydraulic valve between ordinary hydraulic valves and electro-hydraulic servo valves. This type of hydraulic valve can be controlled proportionally, continuously and remotely according to the input electrical control signal (analog quantity). Flow direction, pressure and flow of fluid in hydraulic systems. [0003] Since the valve opening controlled by this type of proportional valve is proportional to the size of the electrical control signal, how to reasonably control the corresponding relationship between the output si...

AI Technical Summary

Problems solved by technology

[0011] 1) After the hydraulic system works continuously for a period of time, the oil temperature will increase, and the resistance of the corresponding valve head will change, so that the corresponding valve openings under the same control voltage signal are different;

[0012] 2) The valve opening is only a qualitative control, but it cannot achieve a quantitative control, that is, the corresponding relationship between the input signal and the valve opening cannot be achieved;

[0014] For such as figure 2 Although the proportional control valve with its own feedback can realize the corresponding relationship between the input signal and the valve response, it can also offset the influence of the oil temperature change of its own hydraulic system, but its corresponding cost is relatively high, which is obviously higher than that of ordinary valves. The proportional valve; on the other hand, the proportional valve with its own feedback can not offset the impact of system voltage changes

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