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Method for determining two types of parameters in full-digital driving of Coriolis mass flowmeter

A technology for mass flowmeters and determining methods, applied in direct mass flowmeters, mass flow measuring devices, measuring flow/mass flow, etc., can solve problems such as fluctuations and failure of primary instruments to achieve convenient control and improve drive control effect of effect

Active Publication Date: 2018-11-16
HEFEI UNIV OF TECH
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Problems solved by technology

If the same set of control parameters is used to control different primary instruments, it may cause large fluctuations, so that the primary instrument cannot work normally

Method used

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  • Method for determining two types of parameters in full-digital driving of Coriolis mass flowmeter
  • Method for determining two types of parameters in full-digital driving of Coriolis mass flowmeter
  • Method for determining two types of parameters in full-digital driving of Coriolis mass flowmeter

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Embodiment Construction

[0020] figure 1 Contains two types of key parameters in the all-digital drive amplitude control to be determined in the present invention: logarithmic error base and PI parameters of different primary instruments. Among them, the logarithmic error base is set according to the difference in the expected value of the speed sensor signal; the PI parameters of different primary instruments are controlled by the PI parameters of a known primary instrument according to the PI between the known primary instrument and the required primary instrument The proportional relationship of the steady state output value of the device is determined.

[0021] The hardware block diagram of the digital drive system of Coriolis mass flowmeter based on DSP is as follows: figure 2 As shown, the control core is TMS320F28335DSP (digital signal processor), and the combination of DDS (direct digital frequency synthesizer) + MDAC (multiplicative digital-to-analog converter) is used to perform driving ta...

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Abstract

The invention relates to the technical field of flow detection, and discloses a method for determining the logarithmic error bottom number and the PI controller parameters of different primary instruments in amplitude value control of full-digital driving method of Coriolis mass flowmeter. The method comprises the steps of exciting a flow tube with a finite-length sine wave to establish a second-order mathematical model of the flow tube vibration system; selecting logarithmic error of different bottom as input of the controller according to expected values; and adjusting the PI parameter according to the proportional relationship of the steady state output value of the PI controller to control different primary instruments. The method has the advantages of improving driving control effectand facilitating driving control of different primary instruments.

Description

technical field [0001] The invention relates to the field of flow detection, and is a method for determining two types of parameters in the amplitude control of the all-digital driving method of the Coriolis mass flowmeter. These two types of parameters are the logarithmic error base and the PI controller parameters of different caliber primary instruments and different types of primary instruments (hereinafter referred to as different primary instruments). The determination method is composed of the establishment method of the mathematical model of the flow tube vibration system, the determination method of the logarithmic error base and the determination method of the PI controller parameters of different primary instruments. A finite-length sine wave is used to excite the flow tube, and a second-order mathematical model of the flow tube vibration system is established, which provides a benchmark for the tuning of PI parameters. According to the difference of the expected v...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/84G06F17/50
CPCG01F1/8409G06F30/367
Inventor 徐科军刘文乐静徐浩然张伦
Owner HEFEI UNIV OF TECH
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