CN105136343A - Self-healing precision correction method for supersonic heat energy metering device - Google Patents

Abstract

The invention belongs to the field of energy metering, and relates to a self-healing precision correction method for a supersonic heat energy metering device. The method comprises the following main technological steps: firstly carrying out the hardware configuration of the supersonic heat energy metering device; secondly selecting a conventional TG840 main control chip and a TDC-GP22 time chip; thirdly setting a conventional zero-returning algorithmic program of static zero time difference of the supersonic heat energy metering device in the chips; fourthly setting a conventional program which obtains time difference through a peak value and a minimum value in the main control and time chips; and finally carrying out the non-linear correction of the supersonic heat energy metering device through a function of self-healing correction of the metering device. The method effectively eliminate the impact on metering precision from the factors (physical asymmetry, time drift, pipe bubbles and on-site noise) of an electronic circuit, enables the metering device to be simple in the overall structure, and enables the time measurement precision to be high.

Description

A kind of self-healing precision correcting method of ultrasonic heat energy measuring apparatus

Technical field:

The invention belongs to thermal metering technical field, relate to the self-healing precision correcting method of a kind of ultrasonic heat energy metering, particularly a kind of being used for improves the correction technique of measuring accuracy, stability and reliability.

Background technology:

At present, the household metering of central heating and heat becomes the common recognition of heat supply circle already as the important social cause of energy-saving and emission-reduction and quality of improving the people's livelihood, and progressively puts on the agenda of governments at all levels, country, from calendar year 2001, namely starts with from heating power system reform and heat metering, has put into effect some files and Policy Conditions, positive popularization heat household metering system, particularly over the past two years, country more and more payes attention to the work promoting advanced heat measuring method, requires more and more specification, heat energy metering device is installed at New Dwelling point family has become acceptance of work necessary condition, in the prior art, ultrasonic heat energy measuring apparatus is the meter specially being mainly used in heat metering, introduced domestic after 2000 by Europe, be limited to the technical merit of chip level at that time and domestic imitation producer, the heat energy meter produced is in the accuracy of measuring, all there is a lot of problem in stability and operating mode use, really can not meet domestic household metering requirement, a lot of city was through the installation pilot of nearly 2 years, numerous and confused decision no longer adopts domestic table, reason is after 1-2 Heating Season, it is overproof that ultrasonic heat energy measuring apparatus there will be precision, even cannot normally work, for a long time, the stable accuracy sex chromosome mosaicism of ultrasonic heat energy measuring apparatus, it is a primary difficult problem for puzzlement industry experts always, domestic and international technical specialist and scholar, attempt to improve measuring accuracy and stability by strengthening the forms such as the aging and transducer pairing of electronic devices and components electrical inspection, high/low temperature, but fundamentally cannot eliminate the impact of time drift, although and the product produced dispatches from the factory time qualified, precision is overproof gradually in operating conditions, the measurement of the non-single one physical amount of the precision measure due to ultrasonic heat energy measuring apparatus, the factor affecting precision is complicated, mutual cross influence, therefore, analyze various factors to set up correct physical model, select rational circuit design and chip application to be basic link, to the acquisition process of the analysis of the method for sampling and selecting properly, data and modification method etc., setting up reliable mathematical model is accurately the final means solving error, therefore, seek to design the technical method that a kind of measuring accuracy to ultrasonic heat energy measuring apparatus carries out self-healing correction, fundamentally solve the overproof problem of measuring accuracy, to improve precision, stability and reliability that ultrasonic heat energy measures.

Summary of the invention:

The object of the invention is to the shortcoming overcoming prior art existence, in conjunction with actual demand, the self-healing precision correcting method of a kind of ultrasonic heat energy metering of design is proposed, cause measuring error larger to solve existing ultrasonic heat energy measuring apparatus due to reasons such as electronic circuit physics is asymmetric, time drift, pipeline bubble and on-the-spot noises, have a strong impact on the problem of measuring accuracy, reduce peripheral circuit, simplify production technology, reduce the power consumption of complete machine, ensure measuring accuracy.

In order to realize foregoing invention object, the self-healing precision correcting method of the ultrasonic heat energy metering that the present invention relates to, its main technological steps comprises:

(1) first hardware assembling is carried out to ultrasonic heat energy measuring apparatus, select conventional TG840 main control chip and TDC-GP22 time chip, TG840 main control chip take Cortex-M3 as kernel, there is operation processing function, the performance of whole measuring apparatus is got a promotion, TDC-GP22 time chip has double precision mode 45ps or four accuracy modes 22ps functions, realizes high-precision time measurement, for follow-up precision measure provides hardware foundation;

(2) again Software for Design and loading are carried out to chip, enroll the algorithm routine of the static time difference at the zero point zero of conventional ultrasonic heat energy measuring apparatus in the chips, the whole time period can be replaced by the measurement result of section sometime, eliminate static zero point;

(3) in master control and time chip, enroll the conventional program being obtained the mistiming by peak-to-peak value and minimum value method again, eliminate the signal disturbing of bubble and noise; Realize gathering 10 times within a second, forward and reverse sequence from small to large respectively gets front 5 decimals, and oppositely the first five number subtracts 5 numbers just forward;

(4) on the basis of the heat energy metering device hardware & software configuration of completing steps (1) (2) (3), the self-healing property debugging functions utilizing measuring apparatus to have realize carrying out non-liner revision to ultrasonic heat energy measuring apparatus, detailed process is: nonlinear curve flow formula Taylor series expansion method being carried out fit time difference Δ T and flow Q, is launched by instantaneous delivery Q according to Taylor series definition:

$\begin{array}{c}Q=\underset{k=1}{\overset{n}{\Σ}}\frac{f^{\left(k\right)}\left(x_0\right)}{k!}{(\mathrm{\Δ}T-x_0)}^k\\ =a+b\mathrm{\Δ}T+c{\left(\mathrm{\Δ}T\right)}^2+d{\left(\mathrm{\Δ}T\right)}^3+......\end{array}$

Wherein k be less than or equal to 1 positive integer, n is positive integer, x ₀for parameter point; A, b, c are respectively the coefficient of Taylor number expansion; Again according to variation tendency and the actual computation of nonlinear curve, adopt three rank taylor series expansions to obtain exact solution, select seven calibration points to calculate coefficient a, b, c, d of taylor series expansion; Timing signal, first ultrasonic heat energy measuring apparatus is installed on detection means, detect the time value of calibrational capacity point, run a period of time, obtain this flow point corresponding time value Δ Ti and instantaneous delivery Qi, measure all the other calibrational capacity points successively, obtain seven groups of Δ T and Q value, substitute into following quaternary linear function group respectively and solve, obtain corresponding a, b, c, d coefficient;

$\left\{\begin{array}{c}a+{\mathrm{b\ΔT}}_1+{{\mathrm{c\ΔT}}_1}^2+{{\mathrm{d\ΔT}}_1}^3=Q_1\\ a+{\mathrm{b\ΔT}}_2+{{\mathrm{c\ΔT}}_2}^2+{{\mathrm{d\ΔT}}_2}^3=Q_2\\ a+{\mathrm{b\ΔT}}_3+{{\mathrm{c\ΔT}}_3}^2+{{\mathrm{d\ΔT}}_3}^3=Q_3\\ a+{\mathrm{b\ΔT}}_4+{{\mathrm{c\ΔT}}_4}^2+{{\mathrm{d\ΔT}}_4}^3=Q_4\end{array}\right.$

Again a, b, c, d are substituted into respectively the three rank taylor series expansions of instantaneous delivery Q, complete the non-liner revision to instantaneous delivery, realize thermal metering self-healing debugging functions.

Compared with prior art, the factors such as the electronic circuit physics of heat energy metering device is asymmetric, time drift, pipeline bubble and on-the-spot noise that adopt zero point and minimum value method effectively to eliminate are on the impact of measuring accuracy in the present invention; Adopt the matching of Taylor technology only to need demarcation seven flow points, compared with needing to demarcate up to a hundred flow points with prior art, improve the production efficiency of heat energy metering device, and precision is higher; The complete machine structure incorporating the inventive method manufacture is simple, and principle is reliable, and measuring accuracy is high, technique is simple, reasonable in design, safe and reliable, environmental friendliness.

Embodiment:

Below by specific embodiment, the invention will be further described.

Embodiment 1:

The ultrasonic heat energy metering self-healing precision correcting method that the present embodiment relates to realizes in ultrasonic heat energy measuring apparatus, and its concrete technology step comprises:

(1) first hardware assembling is carried out to ultrasonic heat energy measuring apparatus, select conventional TG840 main control chip and TDC-GP22 time chip, TG840 main control chip take Cortex-M3 as kernel, there is operation processing function, the performance of whole measuring apparatus is got a promotion, TDC-GP22 time chip has double precision mode 45ps or four accuracy modes 22ps functions, realizes high-precision time measurement, for follow-up precision measure provides hardware foundation;

(2) again Software for Design and loading are carried out to chip, enroll the algorithm routine of the static time difference at the zero point zero of conventional ultrasonic heat energy measuring apparatus in the chips, the whole time period can be replaced by the measurement result of section sometime, eliminate static zero point;

(3) in master control and time chip, enroll the conventional program being obtained the mistiming by peak-to-peak value and minimum value method again, eliminate the signal disturbing of bubble and noise; Realize gathering 10 times within a second, forward and reverse sequence from small to large respectively gets front 5 decimals, and oppositely the first five number subtracts 5 numbers just forward;

(4) on the basis of the heat energy metering device hardware & software configuration of completing steps (1) (2) (3), the self-healing property debugging functions utilizing measuring apparatus to have realize carrying out non-liner revision to ultrasonic heat energy measuring apparatus, detailed process is: nonlinear curve flow formula Taylor series expansion method being carried out fit time difference Δ T and flow Q, is launched by instantaneous delivery Q according to Taylor series definition:

$\begin{array}{c}Q=\underset{k=1}{\overset{n}{\Σ}}\frac{f^{\left(k\right)}\left(x_0\right)}{k!}{(\mathrm{\Δ}T-x_0)}^k\\ =a+b\mathrm{\Δ}T+c{\left(\mathrm{\Δ}T\right)}^2+d{\left(\mathrm{\Δ}T\right)}^3+......\end{array}$

Wherein k be less than or equal to 1 positive integer, n is positive integer, x ₀for parameter point; A, b, c are respectively the coefficient of Taylor number expansion; Again according to variation tendency and the actual computation of nonlinear curve, adopt three rank taylor series expansions to obtain exact solution, select seven calibration points to calculate coefficient a, b, c, d of taylor series expansion; Timing signal, first ultrasonic heat energy measuring apparatus is installed on detection means, detect the time value of calibrational capacity point, run a period of time, obtain this flow point corresponding time value Δ Ti and instantaneous delivery Qi, measure all the other calibrational capacity points successively, obtain seven groups of Δ T and Q value, substitute into following quaternary linear function group respectively and solve, obtain corresponding a, b, c, d coefficient;

$\left\{\begin{array}{c}a+{\mathrm{b\ΔT}}_1+{{\mathrm{c\ΔT}}_1}^2+{{\mathrm{d\ΔT}}_1}^3=Q_1\\ a+{\mathrm{b\ΔT}}_2+{{\mathrm{c\ΔT}}_2}^2+{{\mathrm{d\ΔT}}_2}^3=Q_2\\ a+{\mathrm{b\ΔT}}_3+{{\mathrm{c\ΔT}}_3}^2+{{\mathrm{d\ΔT}}_3}^3=Q_3\\ a+{\mathrm{b\ΔT}}_4+{{\mathrm{c\ΔT}}_4}^2+{{\mathrm{d\ΔT}}_4}^3=Q_4\end{array}\right.$

Again a, b, c, d are substituted into respectively the three rank taylor series expansions of instantaneous delivery Q, complete the non-liner revision to instantaneous delivery, realize thermal metering self-healing debugging functions.

Embodiment 2:

The present embodiment carries out stability and repeatability metering experiment by adopting multiple measuring apparatus of the inventive method, and its particular content and step are:

(1) get the product 6 of the present embodiment, identify 1#, 2#, 3#, 4#, 5#, 6# respectively; According to JJG225-2001 " heat meter calibration code " requirement, under same test condition, examine and determine under 3 flow points (2500,250,50L/h) respectively transducer change before, change after do not demarcate static with change after demarcate the flow accuracy of static three, test data result is as follows:

(2) get the product of the present embodiment and each 3 of the calorimeter of other manufacturer production, identify 1#, 2#, 3#, 4#, 5# and 6# respectively; According to JJG225-2001 " heat meter calibration code " requirement, under same test condition, under 3 flow points (2500,250,50L/h), the flow accuracy before and after transducer is changed in calibrating respectively, and experimental data contrast is as follows:

(3) product 10 of the present embodiment is got, identify 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10# respectively, in (50 ± 5) DEG C water, measure the flow before and after its experiment continuously in 2500,750,250 and 50L/h tetra-flow points respectively, experimental data contrast is as follows:

Test data before experiment:

Test data after experiment:

(3) get the product 10 of the present embodiment, be test under the test condition of (60 ± 5) DEG C in water temperature, after 2 ~ 3 Heating Seasons, carry out accuracy detection to it, measuring accuracy still meets national secondary table standard.

Analyze above-mentioned experimental data can obtain, change transducer in the present embodiment product uses, when the electrical parameter of components and parts and physical parameter change, the present embodiment product energy accurate measurement heat, and be have self-healing correction effect, ensure measurement mechanism stability, meet national secondary table standard, precision is all within 1%, far below national standard, and before and after experiment, accuracy data is consistent, and the product of the present embodiment has good reliability and stability, measuring accuracy is high, and environment for use is friendly.

Claims (1)

1. a self-healing precision correcting method for ultrasonic heat energy measuring apparatus, is characterized in that its main technological steps comprises:

(1) first hardware assembling is carried out to ultrasonic heat energy measuring apparatus, select conventional TG840 main control chip and TDC-GP22 time chip, TG840 main control chip take Cortex-M3 as kernel, there is operation processing function, the performance of whole measuring apparatus is got a promotion, TDC-GP22 time chip has double precision mode 45ps or four accuracy modes 22ps functions, realizes high-precision time measurement, for follow-up precision measure provides hardware foundation;

(2) again Software for Design and loading are carried out to chip, enroll the algorithm routine of the static time difference at the zero point zero of conventional ultrasonic heat energy measuring apparatus in the chips, the whole time period can be replaced by the measurement result of section sometime, eliminate static zero point;

(3) in master control and time chip, enroll the conventional program being obtained the mistiming by peak-to-peak value and minimum value method again, eliminate the signal disturbing of bubble and noise; Realize gathering 10 times within a second, forward and reverse sequence from small to large respectively gets front 5 decimals, and oppositely the first five number subtracts 5 numbers just forward;

(4) on the basis of the heat energy metering device hardware & software configuration of completing steps (1) (2) (3), the self-healing property debugging functions utilizing measuring apparatus to have realize carrying out non-liner revision to ultrasonic heat energy measuring apparatus, concrete principle process is: nonlinear curve flow formula Taylor series expansion method being carried out fit time difference Δ T and flow Q, is launched by instantaneous delivery Q according to Taylor series definition:

$\begin{array}{c}Q=\underset{k=1}{\overset{n}{\Σ}}\frac{f^{\left(k\right)}\left(x_0\right)}{k!}{(\mathrm{\Δ}T-x_0)}^k\\ =a+b\mathrm{\Δ}T+c{\left(\mathrm{\Δ}T\right)}^2+d{\left(\mathrm{\Δ}T\right)}^3+......\end{array}$

Wherein k be less than or equal to 1 positive integer, n is positive integer, x ₀for parameter point; A, b, c are respectively the coefficient of Taylor number expansion; Again according to variation tendency and the actual computation of nonlinear curve, adopt three rank taylor series expansions to obtain exact solution, select seven calibration points to calculate coefficient a, b, c, d of taylor series expansion; Timing signal, first ultrasonic heat energy measuring apparatus is installed on detection means, detect the time value of calibrational capacity point, run a period of time, obtain this flow point corresponding time value Δ Ti and instantaneous delivery Qi, measure all the other calibrational capacity points successively, obtain seven groups of Δ T and Q value, substitute into following quaternary linear function group respectively and solve, obtain corresponding a, b, c, d coefficient;

$\left\{\begin{array}{c}a+{\mathrm{b\ΔT}}_1+{{\mathrm{c\ΔT}}_1}^2+{{\mathrm{d\ΔT}}_1}^3=Q_1\\ a+{\mathrm{b\ΔT}}_2+{{\mathrm{c\ΔT}}_2}^2+{{\mathrm{d\ΔT}}_2}^3=Q_2\\ a+{\mathrm{b\ΔT}}_3+{{\mathrm{c\ΔT}}_3}^2+{{\mathrm{d\ΔT}}_3}^3=Q_3\\ a+{\mathrm{b\ΔT}}_4+{{\mathrm{c\ΔT}}_4}^2+{{\mathrm{d\ΔT}}_4}^3=Q_4\end{array}\right.$

Again a, b, c, d are substituted into respectively the three rank taylor series expansions of instantaneous delivery Q, complete the non-liner revision to instantaneous delivery, realize thermal metering self-healing debugging functions.