CN114281002A - Wine distributor control system and method based on pulse flowmeter - Google Patents
Wine distributor control system and method based on pulse flowmeter Download PDFInfo
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Abstract
The invention discloses a wine distributor control system and a method based on a pulse flowmeter, wherein the scheme converts a flow value in a wine outlet instruction into a corresponding number of wine outlet pulses; detecting working pulses of the pulse flowmeter in real time through interruption and calculating pulse width; and judging and counting whether the detected corresponding pulse is a normal pulse according to the calculated pulse width, and controlling the working state of the pulse flowmeter according to the counting result. The scheme provided by the invention can realize high-precision wine output control based on the low-end pulse flowmeter, greatly reduce the cost and control the error within an ideal range.
Description
Technical Field
The invention relates to a metering control technology, in particular to a metering control technology for a pulse flowmeter.
Background
In recent years, with the gradual maturity of mobile internet technology and the vigorous development of internet of things, a large number of shared products appear and are brought into the market. Such as sharing treasured that charges, sharing bicycle, various novel instruments or equipment such as sharing umbrella.
Wherein the shared wine is a novel product which appears in 2019. The products of sharing wine are characterized in that equipment manufacturers, wineries, agents, shop merchants and users are connected together through software and hardware, so that the users can taste corresponding wine commodities through simple mobile operation (such as scanning), the whole bottle and the whole box of wine commodities do not need to be purchased at high price, and meanwhile, the business of the merchants is used for stocking a large number of wine commodities.
Because the application scene of the wine distributor has higher precision requirement, the wine distributor in the current market mostly adopts a high-end flowmeter to ensure the accuracy.
At present, the wine distributor in the market mostly adopts a high-end flowmeter, and the cost is higher. And the error of the low-end pulse flowmeter is large, so that the requirement cannot be met. Therefore, the problem to be solved in the field is to provide a wine dispenser metering scheme with high precision and low cost.
Disclosure of Invention
Aiming at the problems of the flow metering scheme of the existing wine distributor, the invention aims to provide a wine distributor control scheme based on a pulse flow meter, and the high-precision flow metering is realized based on a low-end pulse flow meter.
In order to achieve the above object, the present invention specifically provides a wine distributor control system based on a pulse flow meter, the control system comprising:
the instruction conversion module is used for converting the flow value in the wine outlet instruction into the corresponding number of wine outlet pulses;
the detection and calculation module detects working pulses of the pulse flowmeter in real time through interruption and calculates pulse width;
the control module judges and counts whether the corresponding pulse detected by the detection and calculation module is a normal pulse according to the pulse width calculated by the detection and calculation module; and the control module also controls the working state of the pulse flowmeter according to the statistical result.
Further, the instruction conversion module converts the flow value in the wine outlet instruction into the corresponding number of pulses through an algorithm module f ═ K × V + b, wherein parameters K and b are determined through a calibration wine distributor, V is the volume of wine to be discharged, and f is the number of wine discharge pulses.
Further, the detection and calculation module performs pulse counting and pulse width calculation based on single-chip microcomputer hardware interruption.
Further, the control system further comprises a calibration module, and the calibration module completes calibration of the pulse flowmeter based on the following formula:
f＝K*V+b；
wherein V is the target wine outlet volume, f is the sampling pulse number of the flowmeter, k is a proportionality coefficient, and b is a constant.
Furthermore, before the wine outlet flow rate of the wine distributor is stable, if the detected pulse number F < | b | is detected, the control module adopts approximate processing, and counts the pulse number F to 2 × F.
In order to achieve the above object, the present invention specifically provides a method for controlling a wine dispenser based on a pulse flow meter, wherein the method for controlling the wine dispenser comprises:
converting the flow value in the wine outlet instruction into the corresponding number of wine outlet pulses;
in the process of controlling wine output by the pulse flowmeter, detecting the working pulse of the pulse flowmeter in real time through interruption and calculating the pulse width;
judging and counting whether the detected corresponding pulse is a normal pulse according to the calculated pulse width;
and controlling the working state of the pulse flowmeter according to the statistical result.
Furthermore, in the control method, the flow value in the wine outlet instruction is converted into the corresponding number of pulses based on an algorithm formula f ═ K × V + b, wherein parameters K and b are determined by calibrating the wine distributor, V is the volume of wine to be discharged, and f is the number of wine pulses to be discharged.
Furthermore, in the control method, pulse counting is carried out through hardware interruption of the single chip microcomputer, when the flowmeter sends out pulses, the single chip microcomputer automatically triggers corresponding interruption, when the interruption triggering type is a rising edge, the single chip microcomputer obtains and records the current time, meanwhile, the time difference obtained by subtracting the last triggering time from the current time is utilized to obtain the pulse width of the corresponding pulses, and if the pulse width is within a reasonable range, the pulse width is recorded as the effective pulses, and the number of the pulses is + 1.
Further, the control method further includes a calibration step, where the calibration step completes calibration of the pulse flowmeter based on the following formula:
f＝K*V+b；
wherein V is the target wine outlet volume, f is the sampling pulse number of the flowmeter, k is a proportionality coefficient, and b is a constant.
Furthermore, in the control method, before the wine outlet flow rate of the wine distributor is stable, if the detected pulse number F < | b | is detected, approximate processing is adopted, and the pulse number F is counted to be 2 × F.
The scheme provided by the invention can realize high-precision wine output control based on the low-end pulse flowmeter, greatly reduce the cost and control the error within an ideal range.
When the scheme provided by the invention is applied specifically, compared with a high-end flowmeter with smaller error, the cost can be greatly reduced; compared with the current scheme of a low-end flowmeter, the method has the advantages of smaller error and stronger real-time property, and can meet the application requirements in a high-precision scene.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a system block diagram of a dispenser control system in accordance with an embodiment of the present invention;
FIG. 2 is a diagram illustrating an example of a wine discharge control process according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
As is well known, the application scenario of the wine distributor has a high requirement on accuracy, and when the metering is realized based on a pulse flowmeter at present, the following problems exist:
(1) due to different component batches and different assembly modes, the pulse flowmeter and other control devices have individual differences, so that the error deviation is large.
(2) There is a large error when the pulse flowmeter starts to flow a little.
(3) Partial processing delay in a pulse flowmeter control program is large, and real-time performance is affected due to influences of data reception, battery voltage acquisition and the like.
Therefore, when a control scheme matched with the pulse flowmeter is constructed, a calibration mechanism, an approximation processing mechanism and an interruption and inquiry mechanism are innovatively introduced, so that the problems brought by the pulse flowmeter are solved, and high-precision metering is realized.
Specifically, the scheme overcomes individual differences between different pulse flowmeters and corresponding control devices through a calibration mechanism.
Through a great deal of research, it is found that, for each pulse flowmeter, if the target flow volume is V, the following relationship exists between the sampling pulse number f of the flowmeter and V:
f＝K*(V-V0)+C；
wherein K is the ratio of the pulse number to the target flow volume under the linear condition, namely the pulse number/volume,
v0 is the volume corresponding to the nonlinear condition, and C is the number of pulses corresponding to the nonlinear portion.
The non-linear condition here is a wine discharge state corresponding to an unstable flow rate when the control of the wine discharge is started. Meanwhile, for the same fixed system, the wine volume is a fixed value under the nonlinear condition, namely V0. In this case, the thread condition is not satisfied until the wine volume is less than V0, and the linear condition is satisfied until the wine volume is greater than V0.
Accordingly, the scheme constructs a corresponding calibration formula based on linear conditions:
f＝K*V+b；
here, b is C-K V0.
Based on the calibration formula, the volume V is measured twice by controlling the pulse flowmeter for the pulse flowmeter to be calibrated, and the parameters K and b corresponding to the pulse flowmeter to be calibrated can be calculated and determined by acquiring the number of corresponding pulses, which is specifically as follows:
f1＝K*V1+b；
f2＝K*V2+b；
then K ═ f2-f 1)/(V2-V1); b-f 2-K V2.
Therefore, based on the calibrated parameters K and b, the accurate relation between the pulse flowmeter f and the pulse flowmeter V can be determined, and the calibration of the pulse flowmeter is completed.
The scheme further adopts an approximate processing mechanism to overcome the error existing when the flow is small.
Specifically, an approximation process is performed for the nonlinear portion F < | b |, and the number of pulses F is counted as 2 × F, thereby reducing the measurement error when the alcohol yield is small.
The scheme solves the problem of large processing delay in the specific application of the pulse flowmeter by adopting an interruption and query mechanism.
Specifically, when the pulse flowmeter is applied specifically, after each operation of the user is completed, the method adopts a query mode to query the remaining operable quantity of the user; meanwhile, an interruption mode is adopted for the total operable amount.
For example, when a user presses or releases a key to adopt an inquiry mode, the user inquires the residual wine output amount of an order after stopping wine output and reports the residual wine output amount to a background;
and the wine output total control adopts an interruption mode, the wine output is automatically stopped when the wine output reaches the total amount of the order, the application is informed of finishing the order, and the subsequent state reporting operation is completed.
By way of example, in particular implementations, the pulse counting herein may be implemented by a GPIO hardware interrupt. Based on the characteristic of high real-time performance of hardware interrupt, the number of pulses is counted in real time when the GPIO detects a rising edge. And when the counted pulse number is larger than the number of the required wine output pulses, closing the water pump in real time during interruption, stopping wine output, and ensuring that the total wine output amount is consistent with the wine output amount of the order. Before the total amount of wine is reached, a user triggers the wine by a key, has no higher requirement on real-time performance, and calculates the current pulse number when the wine is stopped.
Therefore, the scheme further provides a wine distributor control system which can realize the functions of the control scheme so as to be matched with a pulse flowmeter to realize high-precision metering.
Referring to fig. 1, the wine dispenser control system 200 according to the present embodiment is based on the pulse flowmeter 100, and mainly includes three parts, namely, a command conversion module 210, a detection and calculation module 220, a control module 230, and a calibration module 240.
The instruction conversion module 210 performs data interaction with the pulse flowmeter 100 and the front-end wine distribution application system 300 respectively.
The instruction conversion module 210 configured in this way can receive a wine output instruction formed by the front-stage wine dispensing application system 300, and convert the flow value in the wine output instruction into the number of corresponding pulses, where each pulse corresponds to a certain volume in the control system.
The detection and calculation module 220 in the system performs data interaction with the command conversion module 210 and the pulse flowmeter 100, respectively.
The detection and computation module 220 detects pulses of the pulse flow meter operation in real time by interrupting and computing the pulse width.
The control module 230 in the present system performs data interaction with the detection and computation module 220 and the pulse flow meter 100, respectively.
The control module 230 determines and counts whether the corresponding pulse detected by the detection and calculation module is a normal pulse according to the pulse width calculated by the detection and calculation module 220; meanwhile, the control module 230 controls the working state of the pulse flowmeter 100 according to the statistical result.
The calibration module 240 in the present system interfaces with the control module 230 and the pulse flow meter 100, respectively.
The calibration module 240 completes calibration of the pulse flowmeter based on the following formula, and through two measurement operations, the parameters K and b for determining the operation control of the pulse flowmeter 100 can be calculated:
f＝K*V+b；
wherein V is the target wine outlet volume, f is the number of sampling pulses of the flowmeter, k is a proportionality coefficient, b is a constant, and the two numerical values are determined through a calibration process.
Specific embodiments are given below for the control system.
In some embodiments of the present disclosure, the command converting module 210 in the present system converts the flow value in the wine output command into the corresponding number of pulses based on the algorithm module f ═ K × V + b.
Wherein V is the volume of wine to be output (i.e. flow value), and K and b are constants.
In some embodiments of the present disclosure, the detection and calculation module 220 in the system can implement pulse counting and extremely corresponding pulse width based on corresponding single-chip hardware interrupts.
When the flowmeter sends out pulses, the single chip microcomputer automatically triggers corresponding interruption, when the interruption triggering type is a rising edge, the single chip microcomputer obtains and records the current time, and meanwhile, the time difference obtained by subtracting the last triggering time from the current time is utilized to determine the pulse width, if the pulse width is within a reasonable range, the pulse width is recorded as effective pulses, and the number of the pulses is + 1.
In some embodiments of the present disclosure, the control module in the system adopts an approximation process for the nonlinear part F < | b |, and counts the pulse number F to 2 × F.
Here, | b | is the absolute value of b, and since the value of the constant b obtained based on the aforementioned calibration scheme is generally negative, | b | is used here.
The non-linear portion is the period of time during which the flow rate is unstable when the flow meter begins to control the output of wine. Meanwhile, before the flow rate is stable, the measured whole is small, the average error is about 2 times, and when the pulse number f is detected, the scheme adopts a 2 f processing mode to reduce the error.
For the scheme of the wine dispenser control system, when the scheme is applied specifically, a corresponding software program can be formed to form a corresponding wine dispenser control software system. When the software program runs, the wine dispenser control scheme is executed and is stored in the corresponding storage medium, so that the software program can be called and executed by the processor.
With respect to the foregoing solution, the implementation process of the solution is further described below by a specific application example.
In the application example, the wine distributor control system is applied to the scene of the wine sharing system, and high-precision flow control is realized by matching with the wine distributor in the wine sharing system.
It should be noted that the shared wine system completes generation and control of the shared wine order in the corresponding application layer. For the order generation, i.e. the control scheme of the wine sharing system, the application example is not controlled, and the scheme can be determined according to the actual requirement.
In the application example, the wine distributor control system constructed by the scheme is matched with the wine distributor in the wine sharing system, so that high-precision wine output control is completed according to the order information of the wine sharing system.
In a specific application, in order to avoid the problem that each pulse flowmeter and other control devices have individual difference to cause larger error deviation, the approval processing of the pulse flowmeter is firstly completed before the application.
The calibration procedure based on the foregoing calibration scheme is as follows:
1. the control end sends out a 100hz calibration instruction of wine through an MQTT (Message Queuing telemeasuring Transport protocol), the wine distributor automatically discharges wine, and the electronic scale is used for measuring the wine discharge volume V1 after the wine discharge is finished; the electronic scale can be arranged independently and integrated in the wine distributor.
2. Sending a 500hz calibration instruction of wine through MQTT, automatically discharging wine by using a wine distributor, and measuring a wine discharge volume V2 by using an electronic scale after the wine discharge is finished;
3. v1, V2 are sent to the dispenser through MQTT, which automatically calculates the calibration parameters:
K＝(500-100)/(V2-V1)，b＝f2-K*V2。
4. and (3) writing the parameter values of K and b obtained by calibration calculation in the step (3) into a flash memory of the wine distributor, and simultaneously reading out calibration parameters from the flash memory when the wine distributor is started each time so as to configure a control scheme of the pulse flowmeter in the wine distributor.
After the calibration of the wine dispenser pulse flowmeter is completed, the wine outlet control can be completed in cooperation with the order of the wine sharing system, and the corresponding wine outlet control flow is shown in fig. 2.
The wine output control comprises flow meter control and corresponding order control, and the basic coordination process is as follows:
(1) the wine outlet instruction such as 100ml is sent through MQTT, and the wine distributor control system converts 100ml into hz number, namely the number of wine outlet pulses.
The wine distributor control system is based on an algorithm model: f is K × V2+ b. The parameter values of K and b are determined in the calibration stage of the wine dispenser, and are directly read from a flash memory when the wine dispenser is started, and V2 is 100ml, so that the wine pulse number f is directly converted and calculated.
(2) And pressing a wine outlet key on the wine distributor to start wine outlet, and simultaneously detecting pulses and calculating the pulse width in real time by the wine distributor control system through interruption.
(3) The wine distributor control system compares whether the pulse width pw is within a reasonable range (5ms < pw <200ms), if not, records the pulse as an abnormal pulse, adds 1 to the abnormal number, and if the abnormal number is more than 3, marks the pulse as abnormal wine outlet and informs the application of ending the order; if the pulse number f is within a reasonable range, the pulse number f is increased by 2 when the normal pulse number f1< | b | is used, and the pulse number f is increased by 1 when the pulse number f is increased by 2 and f1> | b |.
(4) And if no pulse is detected within 500ms of the overtime time, marking the pulse as a no-wine state and informing the application to end the order, and ensuring that the pumping time for wine output in the wine distributor does not exceed 500 ms.
(5) If a wine outlet button on the wine distributor is released, the wine distributor control system records the current pulse number f, stores the order state and circulates the steps 3, 4 and 5; if the key is not released, the motor is automatically closed when the pulse number f reaches the target pulse number, and the application is informed to end the order.
(6) And the application layer of the wine sharing system detects the change of the wine state in real time and reports the current wine state to the background through the MQTT.
The error control scheme of the wine distributor based on the pulse flow meter, provided by the invention, effectively solves individual errors by combining the calibration scheme and the wine outlet control scheme, reduces the wine outlet error, can ensure the accuracy when the wine outlet volume is lower than 25ml, and has better instantaneity and usability.
When the error control scheme of the wine distributor based on the pulse flowmeter is applied specifically, compared with a high-end flowmeter with smaller error, the cost can be greatly reduced; compared with the current scheme of a low-end flowmeter, the method has the advantages of smaller error and stronger real-time property, and can meet the application requirements in a high-precision scene.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A pulse flowmeter-based wine dispenser control system, the control system comprising:
the instruction conversion module is used for converting the flow value in the wine outlet instruction into the corresponding number of wine outlet pulses;
the detection and calculation module detects working pulses of the pulse flowmeter in real time through interruption and calculates pulse width;
the control module judges and counts whether the corresponding pulse detected by the detection and calculation module is a normal pulse according to the pulse width calculated by the detection and calculation module; and the control module also controls the working state of the pulse flowmeter according to the statistical result.
2. The wine distributor control system based on the pulse flow meter according to claim 1, wherein the instruction conversion module converts the flow value in the wine outlet instruction into the corresponding number of pulses through an algorithm module f ═ K × V + b, wherein parameters K and b are determined by calibrating the wine distributor, V is the volume of wine to be discharged, and f is the number of the wine pulses to be discharged.
3. The pulse flowmeter-based wine dispenser control system of claim 1, wherein the detection and calculation module performs pulse counting and pulse width calculation based on single-chip hardware interrupts.
4. The pulse flowmeter-based wine dispenser control system of claim 1, further comprising a calibration module that performs calibration of the pulse flowmeter based on the formula:
f＝K*V+b；
wherein V is the target wine outlet volume, f is the sampling pulse number of the flowmeter, k is a proportionality coefficient, and b is a constant.
5. The wine dispenser control system based on the pulse flow meter according to claim 1, wherein the control module adopts an approximate process if the detected pulse number F < | b | is detected before the wine dispenser outlet flow rate is stable, and the pulse number F is counted to be 2 x F.
6. A wine distributor control method based on a pulse flowmeter is characterized by comprising the following steps:
converting the flow value in the wine outlet instruction into the corresponding number of wine outlet pulses;
in the process of controlling wine output by the pulse flowmeter, detecting the working pulse of the pulse flowmeter in real time through interruption and calculating the pulse width;
judging and counting whether the detected corresponding pulse is a normal pulse according to the calculated pulse width;
and controlling the working state of the pulse flowmeter according to the statistical result.
7. The method of claim 6, wherein the flow value in the wine dispensing command is converted to the corresponding number of pulses by an algorithm formula f K V + b, wherein the parameters K and b are determined by calibrating the wine dispenser, V is the volume of wine to be dispensed, and f is the number of wine pulses to be dispensed.
8. The wine distributor control method based on the pulse flowmeter as claimed in claim 6, wherein in the control method, pulse counting is performed through hardware interruption of a single chip microcomputer, when the flowmeter sends out a pulse, the single chip microcomputer automatically triggers corresponding interruption, when the interruption triggering type is a rising edge, the single chip microcomputer obtains and records the current time, meanwhile, the time difference obtained by subtracting the last triggering time from the current time is used for obtaining the pulse width of the corresponding pulse, and if the pulse width is within a reasonable range, the pulse width is recorded as an effective pulse, and the number of the pulses is + 1.
9. The method for controlling a wine dispenser based on a pulse flow meter according to claim 6, further comprising a calibration step, wherein the calibration step is performed based on the following formula:
f＝K*V+b；
wherein V is the target wine outlet volume, f is the sampling pulse number of the flowmeter, k is a proportionality coefficient, and b is a constant.
10. The method for controlling the wine dispenser based on the pulse flowmeter according to claim 6, wherein before the wine dispenser flow rate is stabilized, if the detected pulse number F < | b | is detected, an approximation is performed, and the pulse number F is counted as 2 × F.
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| CN102466500A (en) * | 2010-11-19 | 2012-05-23 | 中国电子科技集团公司第五十研究所 | Device and method for detecting quantity of output pulses of pulse type vortex shedding flowmeter, and device and method for determining abnormity of output pulses |
| CN111170257A (en) * | 2019-12-26 | 2020-05-19 | 昆山微商通网络科技有限公司 | Method and device for uniformly and standard wine distribution of different wine distribution devices |
| CN111208758A (en) * | 2019-12-26 | 2020-05-29 | 昆山微商通网络科技有限公司 | Single-path wine distribution method and device based on internet of things metering control of wine distribution amount |
| CN212160823U (en) * | 2020-06-29 | 2020-12-15 | 上海蜜连科技有限公司 | Metering and selling control system for wine dispenser |
| CN112729441A (en) * | 2020-12-21 | 2021-04-30 | 唐山学院 | High-precision flow measuring method based on pulse type flow sensor |
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2021
- 2021-12-30 CN CN202111656766.1A patent/CN114281002A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466500A (en) * | 2010-11-19 | 2012-05-23 | 中国电子科技集团公司第五十研究所 | Device and method for detecting quantity of output pulses of pulse type vortex shedding flowmeter, and device and method for determining abnormity of output pulses |
| CN111170257A (en) * | 2019-12-26 | 2020-05-19 | 昆山微商通网络科技有限公司 | Method and device for uniformly and standard wine distribution of different wine distribution devices |
| CN111208758A (en) * | 2019-12-26 | 2020-05-29 | 昆山微商通网络科技有限公司 | Single-path wine distribution method and device based on internet of things metering control of wine distribution amount |
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