Control method and control system of proportion valve

A control system and proportional valve technology, applied in controllers with pulse train output signals, electric controllers, valve operation/release devices, etc., can solve the problem of proportional valve body flutter, PWM signal duty ratio difference, etc. problem, to achieve the effect of ensuring reliability and small vibration

Inactive Publication Date: 2009-01-21
SANY HEAVY IND CO LTD (CN)
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a proportional valve control method to solve the flutter problem of the proportional valve body caused by the differ...

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  • Control method and control system of proportion valve
  • Control method and control system of proportion valve
  • Control method and control system of proportion valve

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Embodiment Construction

[0038] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] The control of the proportional valve by the control system is mainly realized by controlling the average current flowing through the proportional valve. If the amplitude of the PWM signal is equal but the duty cycle is different, the duty cycle of the PWM signal directly determines the current flowing through the proportional valve. The ratio of the average current to the peak current, which determines the spool displacement of the proportional valve, that is, determines the opening of the proportional valve. Therefore, the valve opening of the proportional valve is not directly affected by the amplitude of the PWM pulse signal, but is related to the effective area enveloped by the PWM signal.

[0040] Examples are as foll...

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Abstract

The invention relates to a control method of a proportional valve. The method comprises generating analogue signals and pulse signals of preset frequency and duty ratio, selecting the analogue signals corresponding to the pulse signals in the period of high level or low level, transmitting the selected signals to the proportional valve, and controlling the action of the proportional valve. The method also can obtain opening signals of the proportional valve, and adjusts voltage amplitude of generated analogue signals according to the opening signals of the proportional valve. Simultaneously, the invention discloses a control system of the proportional valve. When the control system of the proportional valve controls the opening of the proportional valve, vibration of the valve body of the proportional valve can be effectively avoided, thereby increasing the reliability of using the proportional valve.

Description

technical field [0001] The invention relates to the field of proportional valve control, in particular to a control method and a control system for a proportional valve. Background technique [0002] The electro-hydraulic proportional control valve (proportional valve for short) is a hydraulic control valve between the hydraulic valve and the electro-hydraulic servo valve. The proportional valve receives an external control signal and adjusts the displacement of the valve core according to the control signal to make the valve open. The degree changes in proportion to the strength of the control signal, effectively regulates the medium passing through the proportional valve, and finally realizes precise control of the system using the proportional valve. [0003] At present, the pulse width modulation signal (PWM signal) is often used as the control signal of the proportional valve. The control system sends PWM signals with a certain frequency and different duty ratios to th...

Claims

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Application Information

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IPC IPC(8): F16K17/36F16K31/02G05B11/26
Inventor 周翔杨栋熊俊李建洪
Owner SANY HEAVY IND CO LTD (CN)
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