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Flow control system and control method in mixed mode of pulse code modulation and pulse width modulation

A technology of pulse width modulation and regulation system, applied in the direction of flow control of electrical devices, etc., can solve problems such as failures that cannot be overcome

Inactive Publication Date: 2008-11-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adding position feedback can help diagnose problems, but not overcome them

Method used

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  • Flow control system and control method in mixed mode of pulse code modulation and pulse width modulation
  • Flow control system and control method in mixed mode of pulse code modulation and pulse width modulation
  • Flow control system and control method in mixed mode of pulse code modulation and pulse width modulation

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Embodiment

[0035] Example: For a combined flow valve including 4 on-off valves, it is assumed that the corresponding flow object is a first-order object, and the transition time is T f , the cycle of its superior module sending valve position signal to it is T s (T s = 2T f ), the design requires that the flow adjustment accuracy is ≤4% of the range, and the peak-to-peak value of the flow ripple is ≤8% of the range. Among them, the flow coefficients of valve 1, valve 2, valve 3 and valve 4 are respectively C v0 : C v1 : C v2 : C v3 =1:2:4:8, the flow coefficient is 15C when fully open v0 . If the expected valve opening is 45%, the expected C ve =6.75C v0 , the minimum upper approximation obtained when the valve has no faults is 7C v0 , both valve 4 is fully closed and valves 1, 2 and 3 are fully open. The maximum lower approximation is 6C v0 , both valves 2 and 4 are fully open, and the other valves are closed. At this time, the minimum upper approximation 7C is used v0 , t...

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Abstract

A flow rate regulation system of pulse code modulation and pulse width modulation mixed type is prepared for sending valve control signal to controller and sending relevant switch state to a set of switch valves through switching valve output channel, arranging a throttle element on each branch path with switch valve to make flow rate coefficient of each valve be on certain ratio, obtaining feedback signal of valve state through state detection mechanism and sending obtained signal to controller then carrying out fault diagnosis on each valve by controller according to comparison of signals.

Description

technical field [0001] The present invention relates to a flow regulating system and regulating method, in particular to a combined flow regulating system and regulating method using a group of on-off valves instead of pulse code modulation (PCM) and pulse width modulation (PWM) hybrid modes of flow control valves, When one or more on-off valves fail, the normal valves can be logically reconfigured to keep the quality of flow regulation as much as possible. It is used in fluid control occasions of engineering industrial hydraulic and pneumatic control systems. Background technique [0002] In engineering industrial hydraulic and pneumatic control system fluid control occasions, the use of on-off valves instead of flow control valves has many advantages, such as: cheap, no dead zone, no hysteresis, good linearity, fast response, anti-interference and other advantages. The most commonly used techniques are pulse code modulation and pulse width modulation. Pulse code modulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D7/06
Inventor 高金吉张鹏
Owner BEIJING UNIV OF CHEM TECH
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