CN105675318A - Automatic calibrating device for fuel dispenser, leveling method and liquid level image identification method thereof - Google Patents

Abstract

The invention discloses an automatic calibrating device for a fuel dispenser, a leveling method and a liquid level image identification method thereof. The automatic calibrating device for a fuel dispenser includes three parts: a sensor and an execution mechanism, an embedded ARM processor, and a host computer calibrating system. The automatic calibrating device for a fuel dispenser utilizes the embedded technology and the sensor technology to realize automatic leveling of the calibrating device for a fuel dispenser, automatic switching of large and small standard measuring devices, and automatic adjusting of the flow magnitude of a fuel truck nozzle. By means of the camera and the temperature sensor, the automatic calibrating device can automatically read the liquid level of an oil product and the temperature and send the liquid level and the temperature to the host computer through a serial port, and can obtain the practical capacity of the oil product through calculation of compensation in the host computer, and can obtain the indication error of the fuel dispenser by means of comparison with the indicating value of the fuel dispenser. The automatic calibrating device can realize one-time calibration for small, intermediate and large flows for the fuel dispenser, and can emit a signal through the host computer and control a solenoid valve and an oil scavenging pump to perform one-time oil extraction through a controller after completion of calibration, and finally can store the original record and print the calibration report.

Description

The full-automatic assay device of fuel charger and leveling, liquid level image-recognizing method

Technical field

The present invention relates to a kind of full-automatic assay device of fuel charger and leveling, liquid level image-recognizing method, it is adaptable to the calibrating changed fast and automatically of all oil product fuel chargers, belong to electric automatization detection field.

Background technology

Fuel charger is one of product oil most important measurement instrument of field of circulation trade settlement, its accuracy requirement 0.3 grade. For ensureing the accurate metering of oil product, the calibration operation of fuel charger is even more important. The error of indication of domestic measurement technology mechanism many employings Static Volumetric Method detecting fuel dispenser, namely with standard capacity measure standard set-up detecting fuel dispenser. The calculating of standard capacity measure capability value depends primarily on temperature in metering neck liquid level and standard capacity measure, its metering neck liquid level and temperature value are measured and are adopted the artificial mode reading metering neck scale and thermometer to carry out, three major defects that therefore original static volumetric method fuel charger assay device exists:

1) by drum levelling device, inaccuracy, and survey crew manual adjustment screw, workload is heavy;

2) an every fuel charger of calibrating, all needs temperature in manual read's taken amount device, fuel charger outlet temperature and amount neck liquid level, inaccurate, unreliable, efficiency is low;

3) difficulty in computation is big, and because at gas station's execute-in-place, after artificial acquisition liquid level and temperature value, need to manually calculate the orthobaric volume of oil product at 20 DEG C, amount of calculation is big, it has not been convenient to, error-prone, inefficiency.

Summary of the invention

In order to solve above-mentioned technical problem, the present invention provides the full-automatic assay device of fuel charger and leveling, liquid level image-recognizing method that a kind of automaticity is high, efficiency is high, accuracy of detection is high. It mainly includes five parts: leveling module, nozzle flow are automatically adjusted module, liquid level picture recognition module, temperature collect module and host computer verification system.

The technical scheme is that a kind of full-automatic assay device of fuel charger, be automatically adjusted module, standard capacity measure, leveling module, liquid level picture recognition module, temperature collect module, embedded ARM processor, host computer verification system including nozzle flow;The import that described nozzle flow is automatically adjusted module is connected with oil inlet pipe; Described nozzle flow is automatically adjusted the outlet of module and is connected with described standard capacity measure upper end import by flowline; Described embedded ARM processor is automatically adjusted module respectively with nozzle flow, leveling module, liquid level picture recognition module, temperature collect module, host computer verification system are connected; Described nozzle flow is automatically adjusted module and is connected with embedded ARM processor, host computer verification system successively, it is achieved the automatic control and adjustment to nozzle flow, it is possible to realize selecting choosing of large, medium and small range or other fixing ranges; Described leveling module is arranged on described standard capacity measure bottom, described embedded ARM processor people having the same aspiration and interest flat-die block is connected, the inclination value of double-shaft tilt angle sensor is gathered by SPI communication, calculate through PID, send direction control signal and pulse signal controls two motors and realizes device automatic leveling; What described liquid level picture recognition module included being arranged on standard capacity measure upper end cervical region shows liquid pipe and photographic head; Described embedded ARM processor is connected with photographic head, gathers oil level image by embedded ARM processor, openCV carry out gray processing, filtering, binaryzation, rim detection, liquid level extraction, convert actual liquid level height to then through system calibrating is calculated; Described temperature collect module includes temperature sensor in measuring device mouth temperature sensor, measuring device; Described embedded ARM processor is changed by A/D and is gathered the temperature value of temperature sensor in measuring device mouth temperature sensor and measuring device; Described host computer verification system is connected with embedded ARM processor, adopt labview upper computer software, for showing standard capacity measure top base temperature in real time, and level height, and the data obtained are saved as EXCLE protocol, calculated the actual volume obtaining final oil by compensating coefficient, whether automatic decision is qualified, and prints calibration certificate.

Further, described leveling module includes: double-shaft tilt angle sensor, X-axis motor, X-axis sliding screw, fixing leg, y-axis stepper motor, Y-axis sliding screw; Rotating shaft and the X-axis sliding screw of X-axis motor are linked by rotating disk, and X-axis motor rotational drives X-axis sliding screw to rotate, and moves up and down thus realizing sliding screw; Rotating shaft and the Y-axis sliding screw of y-axis stepper motor are linked by rotating disk, and y-axis stepper motor rotational drives Y-axis sliding screw to rotate, and moves up and down thus realizing sliding screw.

Further, described nozzle flow is automatically adjusted module and includes: oil gun fixed case, fuel charger oil gun, regulate trigger gear; It is provided with case lid on front side of described oil gun fixed case, the oil-feed mouth of pipe is reserved in the side of described oil gun fixed case, the described oil-feed mouth of pipe is available for described fuel charger oil gun oil pipe to be passed through, the opposite side of described oil gun fixed case is provided with oil-out, the muzzle of described fuel charger oil gun faces described oil-out, described oil-out connects flowline, and described flowline is provided with triangle electromagnetic valve;

Described adjustment trigger gear is arranged on inside described oil gun fixed case, including motor, stepper motor driver, slide plate, connecting rod, stirs device, and the output shaft end of described motor is cased with circular slide plate, and output shaft is fixed with described slide plate and is connected; One end of described connecting rod is welded on described slide plate circumference side, stirs device described in the other end connection of described connecting rod; Described motor drives the connecting rod on slide plate to rotate so that stirs device and fiddles with the oil gun trigger of described fuel charger oil gun, it is achieved the opening and closing of oil gun trigger.

Further, described embedded ARM processor can send different pulses to described stepper motor driver, drives fuel charger gun trigger to turn to corresponding range district thereby through double; two plectrums;Described embedded ARM processor and described triangle electromagnetic valve, be used for controlling uninterrupted.

Further, described in stir device for double; two plectrums, described pair of plectrum is welded in described connecting rod, and described oil gun trigger is limited between described pair of plectrum, and the described pair of plectrum is perpendicular to the plane at described oil gun trigger place.

Further, described slide plate is circular foil member.

Further, also include solenoid valve control module, send signal by host computer verification system after having examined and determine and carry out disposable oil extraction by arm processor control electromagnetic valve and oil drain pump.

The liquid level image-recognizing method of the full-automatic assay device of a kind of fuel charger, comprises the following steps:

Step 1, shows that liquid pipe and photographic head are enclosed in camera bellows, irradiates with strip source and shows liquid pipe, puts two sources of parallel light on the top of camera bellows, and light can reflect light from air image concave meniscus, and the image of photographic head shooting has the outer wall concave line of a black at concave meniscus place;

Step 2, utilization utilizes camera collection to show liquid pipe oil level line image, carry out the image gathered after obtaining liquid level image processing in real time in arm processor device: first image gray processing is processed, then make smoothing filter to image real time transfer with the two dimension discrete Gaussian function of zero-mean; Then rim detection is adopted to carry out the tolerance of grey scale change of image, detection and location, the detection realizing liquid level of the Canny edge detection algorithm in employing openCV; Calculate the pixels tall of liquid level, eventually pass and camera calibration calculating is converted to actual liquid level height.

Further, described Canny edge detection algorithm specifically comprises the following steps that

Step 2.1, picture smooth treatment:, to image filtering, to remove the noise in image with Gaussian filter;

Step 2.2, seeks gradient algorithm: utilizes derivative operator to obtain gradient spoke value | G | and the direction e of each pixel, namely obtains intensity and the direction thereof at edge:

$\left|G\right|={\[{\left(\frac{\∂f}{\∂x}\right)}^2+{\left(\right(\frac{\∂f}{\∂y}\left)\right)}^2\]}^{\frac{1}{2}}$

$\mathrm{\θ}={\tan }^{-1}\[\frac{\∂f}{\∂x}/\frac{\∂f}{\∂y}\]$

F is filtered image;

Step 2.3, carries out non-maximum suppression to gradient;

Step 2.4, uses double; two thresholds method that all marginal points after non-maximum suppresses are processed;

Step 2.5, edge connects.

A kind of leveling method of the full-automatic assay device of fuel charger, in described leveling module, embedded ARM processor performs following steps:

Step a, with function fd1=open ("/dev/SPI ", O_RDWR) open the double-shaft tilt angle sensor collecting device of SPI communication mode, fd1 is the filec descriptor returned after double-shaft tilt angle sensor collecting device is opened; With function fd1=open ("/dev/GPIO ", O_RDWR) open I/O port equipment fd2 be after I/O port equipment is opened return filec descriptor;

Step b, utilizes read (fd1, buffer, 8) function to read the inclination value of double-shaft tilt angle sensor;

Step c, judges with if () function namely whether the inclination value of X-axis and Y-axis (collect 1024 for horizontal reference value) between 1020-1030 at ± 0.5 °;

Step d, if the value X > 1030 gathered, so by function iotrl (fd2, GPB5_ON, GPB6) GPB5 pin is set high position, making left Y-axis motor rotate forward, send 10* (x-1024) individual pulse to GPB6 pin, left Y-axis motor rotates the distance of corresponding deviation; If the value X < 1020 gathered, so by function iotrl (fd2, GPB5_OFF, GPB6) GPB5 pin is set low position, motor is made to reverse, sending 10* (x-1024) individual pulse to GPB6 pin, motor rotates the distance of corresponding deviation;If the value Y > 1030 gathered, so by function iotrl (fd2, GPB7_ON, GPB8) GPB7 pin is set high position, right side X-axis motor is made to rotate forward, sending 10* (x-1024) individual pulse to GPB8 pin, motor rotates corresponding distance; If the value Y < 1020 gathered, then by function iotrl (fd2, GPB7_OFF, GPB8) GPB7 pin is set low position, make right side X-axis motor reversion, send 10* (x-1024) pulse to GPB8 pin, rotate the distance of corresponding deviation; Cycle-index completes levelling function;

Step e, when value 1020 < X < 1030 (± 0.5 °) gathered, is in leveling state, finally uses close () functional relationships hull closure, quit a program.

The technique effect of the present invention is: by Theoretical Calculation and laboratory investment, confirm that the automatic verification system entirety uncertainty of fuel charger is better than 0.05%, can carrying out the Measurement Verification Work of the fuel charger that class of accuracy is 0.3%, its structure and handling comply fully with real work needs simultaneously. This system can play significant role in the calibrating field of fuel charger, effectively reduces intensity of workers, improves work efficiency. In addition, the present invention also have the advantage that include following some:

1) adopt double-shaft tilt angle sensor to replace drum method, and through motor automatic leveling, replace artificial leveling, save heavy operation.

2) adopt camera collection oil level image, and obtain liquid level through graphics process, adopt temperature sensor collecting temperature, replace artificial reading, and precision is high.

3) the automatic compensation calculation of upper computer software obtains actual oil product capacity, and compared with fuel charger indicating value, obtains the error of indication of fuel charger, replaces artificial calculating, and accuracy is high.

4) during detecting oiling machine, fuel charger oil gun is put in oil gun fixed case by the oil-feed mouth of pipe, the stator clamping fuel charger oil gun in oil gun fixed case, and close case lid, fixing fuel charger oil gun; The output shaft end of motor is fixing with slide plate to be connected, slide plate circumference side is welded to connect one end of bar, the other end of connecting rod connects double; two plectrum, motor drives the connecting rod on slide plate to rotate, double; two plectrum is fiddled with the oil gun trigger of fuel charger oil gun, it is achieved the opening and closing of oil gun trigger; Fuel charger oil gun trigger is arranged on inside oil gun fixed case, and by the opening and closing of step motor control oil gun trigger, to replace people to hold fuel charger oil gun, it is to avoid the health of testing person is damaged by the volatilization of oil.

5), in fuel charger verification process, the calibrating to the large, medium and small flow of fuel charger oil gun is realized by arm processor; The LCD interface of arm processor is connected by data wire with touch screen, and touch screen is provided with large, medium and small flow switch button, when examining and determine large, medium and small flow, presses large, medium and small flow button, opens large, medium and small flow; It addition, the GPIO pin of arm processor and triangle electromagnetic valve, control uninterrupted by triangle electromagnetic valve; The GPIO pin of arm processor is connected with stepper motor driver, is used for controlling motor; Uninterrupted is regulated, it is not necessary to manually pull oil gun trigger and regulate, improve the degree of accuracy of injection flow, substantially increase the work efficiency of staff by arm processor.

Accompanying drawing explanation

Fig. 1 is the model schematic of the full-automatic assay device of invention fuel charger.

In figure: 1. printer, 2.ARM processor, 3. master system, 4. triangle electromagnetic valve, the 5. temperature sensor of measuring device mouth, 6. nozzle flow automatic adjusting mechanism, 7. show liquid pipe, 8. photographic head, 9. temperature sensor in measuring device, 10. standard capacity measure, 11. double-shaft tilt angle sensors, 12. explosion-proof solenoid valves, 13.X shaft step motor, 14.X axle sliding screw, 15. fixing legs, 16.Y shaft step motor, 17.Y axle sliding screw, 18. explosion-proof oil drain pumps.

Fig. 2 is the structure chart of the full-automatic assay device of invention fuel charger.

In figure: 7. show liquid pipe, 8. photographic head, 9. temperature sensor in measuring device, 10. standard capacity measure, 12. explosion-proof solenoid valve, 13.X shaft step motor, 14.X axle sliding screw, 15. fixing legs, 16.Y shaft step motor, 17.Y axle sliding screw, 19. oil extraction valves, 20 measuring device oilers.

Fig. 3 is device leveling flow chart.

Fig. 4 is for calling camera image process chart.

Fig. 5 temperature acquisition flow chart.

Fig. 6 nozzle automatic flow rate adjusting device schematic diagram.

In figure: 21. oil gun fixed cases, 22. motors, 23. oil pipe mouths, 24. pairs of plectrums, 25. oil gun triggers, 26. stators, 27 fuel charger oil guns, 28. case lids, 29. triangle electromagnetic valve 30. slide plates, 31 connecting rods.

Fig. 7 oil level gathers camera bellows structural representation.

In figure: 7. show liquid pipe, 8. photographic head, 41. camera bellows, 42. strip sources.

Fig. 8 is oil level image recognition design sketch; In figure: (a) original level image, (b) gray processing result, result after (c) filtering, (d) edge detection results, result after the extraction of (e) liquid level line.

Fig. 9 is position LabVIEW host computer calibrating picture.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.

System structure is as shown in Figure 1-2. Based on embedded technology the full-automatic assay device of fuel charger using ARM9 as control core, including: nozzle flow is automatically adjusted module, standard capacity measure, leveling module, liquid level picture recognition module, temperature collect module, embedded ARM processor, host computer verification system; The import that described nozzle flow is automatically adjusted module is connected with oil inlet pipe; Described nozzle flow is automatically adjusted the outlet of module and is connected with described standard capacity measure upper end import by flowline; Described embedded ARM processor is automatically adjusted module respectively with nozzle flow, leveling module, liquid level picture recognition module, temperature collect module, host computer verification system are connected; Described nozzle flow is automatically adjusted module and is connected with embedded ARM processor, host computer verification system successively, it is achieved the automatic control and adjustment to nozzle flow, it is possible to realize selecting choosing of large, medium and small range or other fixing ranges; Described leveling module is arranged on described standard capacity measure bottom, described embedded ARM processor people having the same aspiration and interest flat-die block is connected, the inclination value of double-shaft tilt angle sensor 11 is gathered by SPI communication, calculate through PID, send direction control signal and pulse signal controls two motors and realizes device automatic leveling; What described liquid level picture recognition module included being arranged on standard capacity measure upper end cervical region shows liquid pipe 7 and photographic head 8; Described embedded ARM processor is connected with photographic head 8, gathers oil level image by embedded ARM processor 2, openCV carry out gray processing, filtering, binaryzation, rim detection, liquid level extraction, convert actual liquid level height to then through system calibrating is calculated;Described temperature collect module includes temperature sensor 9 in measuring device mouth temperature sensor 5, measuring device; Described embedded ARM processor 2 is changed by A/D and is gathered the temperature value of temperature sensor 9 in measuring device mouth temperature sensor 5 and measuring device; Described host computer verification system is connected with embedded ARM processor, adopt labview upper computer software, for showing standard capacity measure top base temperature in real time, and level height, and the data obtained are saved as EXCLE protocol, calculated the actual volume obtaining final oil by compensating coefficient, whether automatic decision is qualified, and prints calibration certificate.

Described leveling module includes: double-shaft tilt angle sensor 11, X-axis motor 13, X-axis sliding screw 14, fixing leg 15, y-axis stepper motor 16, Y-axis sliding screw 17; Rotating shaft and the X-axis sliding screw 14 of X-axis motor 13 are linked by rotating disk, and X-axis motor 13 rotational drives X-axis sliding screw 14 to rotate, and moves up and down thus realizing sliding screw 14; Rotating shaft and the Y-axis sliding screw 17 of y-axis stepper motor 16 are linked by rotating disk, and y-axis stepper motor 16 rotational drives Y-axis sliding screw 17 to rotate, and moves up and down thus realizing sliding screw 17.

Described nozzle flow is automatically adjusted module and includes: oil gun fixed case 21, fuel charger oil gun 27, adjustment trigger gear; It is provided with case lid 28 on front side of described oil gun fixed case 21, the oil-feed mouth of pipe 23 is reserved in the side of described oil gun fixed case 21, the described oil-feed mouth of pipe 23 is available for described fuel charger oil gun 27 oil pipe to be passed through, the opposite side of described oil gun fixed case 21 is provided with oil-out, the muzzle of described fuel charger oil gun 27 faces described oil-out, described oil-out connects flowline, and described flowline is provided with triangle electromagnetic valve 29; It is internal that described adjustment trigger gear is arranged on described oil gun fixed case 21, including motor 22, stepper motor driver 23, slide plate 20, connecting rod 21, stir device 24, the output shaft end of described motor 22 is cased with circular slide plate 30, and output shaft is fixed with described slide plate 30 and welded; One end of described connecting rod 31 is welded on described slide plate 30 circumference side, stirs device 24 described in the other end connection of described connecting rod 31; Described motor 22 drives the connecting rod 21 on slide plate 30 to rotate so that stirs device 24 and fiddles with the oil gun trigger 25 of described fuel charger oil gun 27, it is achieved the opening and closing of oil gun trigger 25.

Described embedded ARM processor 2 can send different pulses to described stepper motor driver 23, drives fuel charger gun trigger to turn to corresponding range district thereby through double; two plectrums; Described embedded ARM processor 2 and described triangle electromagnetic valve 29, be used for controlling uninterrupted.

What the present invention was preferable to carry out stir, and device is double; two plectrums, and described pair of plectrum is welded in described connecting rod 31, and described oil gun trigger 25 is limited between described pair of plectrum, and the described pair of plectrum is perpendicular to the plane at described oil gun trigger 25 place. Described slide plate 30 is circular foil member. Described pair of plectrum can be one end that two iron plates are welded on connecting rod 31, reserved certain gap between two iron plates, the size in gap can just hold the handle thickness of oil gun trigger, the trigger 25 of fuel charger oil gun 27 is limited between double; two plectrum, and double; two plectrum is perpendicular to the plane at oil gun trigger 25 place; Described connecting rod 31 is parallel with the plane at described oil gun trigger 25 place with the plane that described slide plate 30 is formed.

1. based on Embedded levelling gear module

As the preferred embodiments of the present invention, two standard capacity measures (20L and 100L) are placed in casing by this device, equipped with obliquity sensor on casing, utilize processor gather the inclination value of obliquity sensor and carry out PID calculating, send pulse signal two motors of control and realize device automatic leveling.

Leveling module in Fig. 1 can be made up of ARM+LINUX flush bonding module, SCA100T double-shaft tilt angle sensor, motor and stepper motor driver, scalable leading screw form. Wherein in ARM+LINUX flush bonding module, selection ARMS3C2440 is control core, and Linux is operating system. ARM+LINUX flush bonding module gathers the inclination value (X-axis and Y-axis) of double-shaft tilt angle sensor 11 by SPI communication, calculates through PID, sends direction control signal and pulse signal controls two motors and realizes device automatic leveling; Leveling flow process is as shown in Figure 3. Leveling step is as follows:

1. with function fd1=open ("/dev/SPI ", O_RDWR) open the double-shaft tilt angle sensor collecting device of SPI communication mode, fd1 is the filec descriptor returned after double-shaft tilt angle sensor collecting device is opened; With function fd1=open ("/dev/GPIO ", O_RDWR) open I/O port equipment fd2 be after I/O port equipment is opened return filec descriptor;

2. read (fd1, buffer, 8) function is utilized to read the inclination value of double-shaft tilt angle sensor (SCA100T obliquity sensor);

3. judge namely whether the inclination value of X-axis and Y-axis (collect 1024 for horizontal reference value) between 1020-1030 at ± 0.5 ° with if () function;

If the value X > 1030 4. gathered, so by function iotrl (fd2, GPB5_ON, GPB6) GPB5 pin is set high position, left Y-axis motor is made to rotate forward, sending 10* (x-1024) individual pulse to GPB6 pin, left Y-axis motor rotates the distance of corresponding deviation; If the value X < 1020 gathered, so by function iotrl (fd2, GPB5_OFF, GPB6) GPB5 pin is set low position, motor is made to reverse, sending 10* (x-1024) individual pulse to GPB6 pin, motor rotates the distance of corresponding deviation; If the value Y > 1030 gathered, so by function iotrl (fd2, GPB7_ON, GPB8) GPB7 pin is set high position, right side X-axis motor is made to rotate forward, sending 10* (x-1024) individual pulse to GPB8 pin, motor rotates corresponding distance; If the value Y < 1020 gathered, then by function iotrl (fd2, GPB7_OFF, GPB8) GPB7 pin is set low position, make right side X-axis motor reversion, send 10* (x-1024) pulse to GPB8 pin, rotate the distance of corresponding deviation; Cycle-index completes levelling function;

5., when value 1020 < X < 1030 (± 0.5 °) gathered, it is in leveling state, finally uses close () functional relationships hull closure, quit a program.

2. it is automatically adjusted module based on Embedded nozzle flow

As shown in Figure 6, it is internal that described adjustment trigger gear is arranged on oil gun fixed case 21, including motor 22, slide plate 30, connecting rod 31, double; two plectrum 24; The output shaft end of motor 22 is cased with slide plate 30, output shaft and the fixing connection of slide plate 30, slide plate 30 circumference side is welded with one end of connecting rod 31, the other end of connecting rod 31 is vertically fixing connects double; two plectrum 24, accompany the trigger 25 of fuel charger oil gun 27 between double; two plectrums 24, and double; two plectrum 24 is perpendicular to the plane at trigger place;During oiling, nozzle is put in an oil gun fixed case 21, fuel charger oil gun 27 is added by stator 26 clamping, close case lid 28, when big flow examined and determine by needs, click wide range button in host computer verification system, then arm processor GPIO pin can send 500 pulses to stepper motor driver, stepper motor driver rotates according to umber of pulse drive stepping motor, drives fuel charger gun trigger to turn to wide range district thereby through double; two plectrums; When flow during needs are examined and determine, click the middle span push buttons in host computer, then arm processor GPIO pin can send 300 pulses to stepper motor driver, stepper motor driver rotates according to umber of pulse drive stepping motor, drives fuel charger gun trigger to turn to middle range district thereby through double; two plectrums; When low discharge examined and determine by needs, click the medium and small range of host computer, then arm processor GPIO pin can send 100 pulses to stepper motor driver, and stepper motor driver rotates according to umber of pulse drive stepping motor, drives fuel charger gun trigger to turn to small-range district thereby through double; two plectrums; The division in above-mentioned range district can judge according to the press degree controlling oil gun trigger, for instance wide range district acute pyogenic infection of finger tip oil gun trigger is pressed at utmost, other ranges the like.

As embodiments of the invention, on device equipped with nozzle flow be automatically adjusted module, uninterrupted is regulated by motor, when examining and determine low discharge, open low discharge, and select little measuring device (20L) by triangle valve, when examining and determine big flow, open big flow, and select big measuring device (100L) by triangle valve.

3. based on Embedded liquid level picture recognition module

As Fig. 7 will show that liquid pipe 7 and photographic head 8 are enclosed in camera bellows 41, irradiate with strip source 42 and show liquid pipe, show in liquid pipe liquidometer at thinner glass, adsorption due to oil with glass tubing inwall, the liquid level at edge exceeds a bit than intermediate level, and liquid level totally presents lower concave paraboloid, puts two sources of parallel light on the top of camera bellows, light can reflect light from air image concave meniscus, and the image of photographic head shooting has the outer wall concave line of a black at concave meniscus place. Utilization utilizes photographic head 8 collection to show liquid pipe oil level line image, image acquisition flow chart is as shown in Figure 4, open ("/dev/vido0 ") is utilized to open camera device file, with ioctl (grab_fd, VIDIOCGBBUF, &grab_cap) function obtains facility information, then mmap () function is mapped with internal memory, equipment buffering is mapped to memory headroom again with read_frame (&m_camera, m_image.bits ()) function acquisition present frame figure. Carry out the image gathered after obtaining liquid level image processing in real time in arm processor device 2:

1. image gray processing

Owing to picture to be detected comprises substantial amounts of colouring information, but the identification of image is nonsensical by these information, it is therefore desirable to it is carried out gray processing to filter out the data unrelated with identification information, uses formula in openCV:

RGB=B*0.114+G*0.587+R*0.299 (1)

With cvCvtColor operator, original image being carried out gray processing in openCV, image 8 (b) is the result after image carries out gray processing.

2. image filtering

Image is subject to the impact of various environmental disturbances, display picture there will be noise, in order to reduce the negative effect that noise brings, it is necessary to use noise filter to image real time transfer. Containing various interference information in Fig. 8 (b) image, system adopts the method for gaussian filtering to be removed.Gaussian filter is the linear smoothing filter that the shape according to Gaussian function selects weights, and the noise removing Normal Distribution is had good effect by Gaussian filter. For image, the conventional two dimension discrete Gaussian function of zero-mean makees smoothing filter, and function expression is as follows:

$g\&lsqb;i,j\&rsqb;=e^{-(i^2-j^2)/2{\&part;}^2}---\left(2\right)$

OpenCV calls cvSmooth operator and carries out gaussian filtering. Its result is such as shown in Fig. 8 (c), and Gaussian filter is highly effective for the noise suppressing Normal Distribution.

3. rim detection

The edge of image refers to the image significant part of regional area brightness flop, and the gray scale section in this region generally can be regarded as a step. Rim detection is mainly the tolerance of the grey scale change of image, detection and location. Article adopts the detection realizing liquid level of the Canny algorithm in openCV. Canny edge detection algorithm specifically comprises the following steps that

(1) image smoothing:, to image filtering, to remove the noise in image with Gaussian filter;

(2) gradient algorithm is sought: utilize derivative operator to obtain gradient spoke value | G | and the direction e of each pixel, namely obtain intensity and the direction thereof at edge:

$\left|G\right|={\&lsqb;{\left(\frac{\&part;f}{\&part;x}\right)}^2+{\left(\right(\frac{\&part;f}{\&part;y}\left)\right)}^2\&rsqb;}^{\frac{1}{2}}---\left(3\right)$

$\mathrm{\&theta;}={\tan }^{-1}\&lsqb;\frac{\&part;f}{\&part;x}/\frac{\&part;f}{\&part;y}\&rsqb;---\left(4\right)$

F is filtered image.

(3) gradient is carried out non-maximum suppression;

(4) use double; two thresholds method that all marginal points after non-maximum suppresses are processed;

(5) edge connects.

Image after its process is such as shown in Fig. 8 (d).

4. the pixels tall of liquid level is calculated

First finding out upper and lower two fixed point coordinates and liquid level concave meniscus focus point coordinate (i.e. concave meniscus minimum point), lower fixed point shows liquid pipe liquid level pixels tall exactly to the difference of concave meniscus coordinate points Y-axis pixel value. The liquid level and the reference point figure that extract in Fig. 8 (d) are not regular figures, will find out the barycentric coodinates point of irregular figure, first calculate the square of liquid level and reference point irregular figure, utilize the square in region shared by target as shape description parameter. Square may be used for the region description of two-value or gray level. For discrete intensity image x, (i, j), p+q rank moment of the orign is defined as

$m_{pq}=\underset{i}{\&Sigma;}\underset{j}{\&Sigma;}{i}^p{j}^{q}x(i,j)---\left(5\right)$

Wherein i, j, p, q are the coordinates (pixel coordinate in digital picture) of region point. Make X_C, Y_CRepresent the coordinate of regional barycenter, then:

X_C=M₁₀/M₀₀(6)

Y_C=M₀₁/M₀₀(7)

When bianry image, M₀₀Represent the area in region.

In OpenCV, it is possible to calculate the feature square of polygonal region very easily, it is possible to use letter cvMoments operator calculates the square information of bianry image. The image of barycentric coodinates point and corresponding Y-axis coordinate line is obtained such as shown in Fig. 8 (e) after image procossing.

Eventually pass camera calibration is calculated and convert actual liquid level height to.

4. based on Embedded temperature collect module

Oil temperature needs twice collection, the oil temperature (oil temperature of gas station's oil storage tank) of oiling muzzle gathers and the oil temperature collection in measuring device, it is respectively adopted temperature sensor 9 in measuring device mouth temperature sensor 5 and measuring device, it is PT100 temperature sensor, precision ± 0.2 DEG C, specifically gathers as shown in flow chart 5. utilize open ("/dev/ADC "), open ADC device file, then temperature value is read with read (fd, buffer, sizeofbuffer-1) function. All filling photographic head and temperature sensor on above-mentioned each measuring device, during calibrating, the oil product liquid level of collection, temperature are sent to host computer by serial ports by controller.

5. based on the host computer verification system of LabVIEW

As shown in Figure 9, device adopts LabVIEW as host computer, communicated with slave computer ARM by serial ports, display measuring device top base temperature in real time, and level height, and the data obtained are saved as EXCLE protocol, the actual volume obtaining final oil is calculated by compensating coefficient, whether automatic decision is qualified, and prints calibration certificate.

As one embodiment of the present of invention, Fig. 9 sets two kinds of standard capacity measures for checking, one is 100L, one is 20L, when pressing on host computer picture after corresponding measuring device threshold switch (100L, 20L or other ranges), nozzle flow is automatically adjusted module and is capable of the opening and closing of oil gun trigger 25, exports corresponding range for examining and determine.

Additionally, the present invention is additionally provided with explosion-proof solenoid valve controls module, sends signal by host computer after having examined and determine and carry out disposable oil extraction by arm processor control electromagnetic valve and oil drain pump. Often one nozzle of calibrating needs three times (large, medium and small range) calibrating, if to be discharged to gas station's fuel tank cumbersome by counter for oil every time, therefore fuel reserve tank and explosion-proof solenoid valve 12 and explosion-proof oil drain pump 18 are installed on device, once just first oil is discharged in fuel reserve tank at host computer click oil extraction button by ARM control explosion-proof solenoid valve 12 when having examined and determine, after a nozzle calibrating completes for three times, host computer clicks oil drain pump control knob, control explosion-proof bat oil pump by ARM, be discharged to counter for the oil of fuel reserve tank in gas station's fuel reserve tank.

To sum up, the invention discloses the full-automatic assay device of fuel charger and leveling, liquid level image-recognizing method. This device utilizes embedded technology and sensor technology, it is achieved the automatic leveling of fuel charger assay device, automatic switchover size criteria measuring device, be automatically adjusted the uninterrupted of nozzle; Automatically reading oil product liquid level, temperature by photographic head and temperature sensor, and serial ports is sent to host computer verification system, in host computer, compensation calculation obtains actual oil product capacity, and compared with fuel charger indicating value, obtains the error of indication of fuel charger; Realize fuel charger little, in, the disposable calibrating of big flow, send signal by host computer after having examined and determine and control electromagnetic valve and oil drain pump by arm processor and carry out disposable oil extraction, finally preserve protocol and also print probation redport.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention. In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example. And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.

Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: these embodiments can being carried out multiple change, amendment, replacement and modification when without departing from principles of the invention and objective, the scope of the present invention is limited by claim and equivalent thereof.

Claims (10)

1. the full-automatic assay device of fuel charger, it is characterised in that: include nozzle flow and be automatically adjusted module, standard capacity measure, leveling module, liquid level picture recognition module, temperature collect module, embedded ARM processor, host computer verification system; The import that described nozzle flow is automatically adjusted module is connected with oil inlet pipe; Described nozzle flow is automatically adjusted the outlet of module and is connected with described standard capacity measure upper end import by flowline; Described embedded ARM processor is automatically adjusted module respectively with nozzle flow, leveling module, liquid level picture recognition module, temperature collect module, host computer verification system are connected;

Described nozzle flow is automatically adjusted module and is connected with embedded ARM processor, host computer verification system successively, it is achieved the automatic control and adjustment to nozzle flow, it is possible to realize selecting choosing of large, medium and small range or other fixing ranges;

Described leveling module is arranged on described standard capacity measure bottom, described embedded ARM processor people having the same aspiration and interest flat-die block is connected, the inclination value of double-shaft tilt angle sensor (11) is gathered by SPI communication, calculate through PID, send direction control signal and pulse signal controls two motors and realizes device automatic leveling;

What described liquid level picture recognition module included being arranged on standard capacity measure upper end cervical region shows liquid pipe (7) and photographic head (8); The same photographic head of described embedded ARM processor (8) is connected, oil level image is gathered by embedded ARM processor (2), carried out gray processing, filtering, binaryzation, rim detection, liquid level extraction by openCV, convert actual liquid level height to then through system calibrating is calculated;

Described temperature collect module includes temperature sensor (9) in measuring device mouth temperature sensor (5), measuring device; Described embedded ARM processor (2) is changed by A/D and is gathered the temperature value of temperature sensor (9) in measuring device mouth temperature sensor (5) and measuring device;

Described host computer verification system is connected with embedded ARM processor, adopt labview upper computer software, for showing standard capacity measure top base temperature in real time, and level height, and the data obtained are saved as EXCLE protocol, calculated the actual volume obtaining final oil by compensating coefficient, whether automatic decision is qualified, and prints calibration certificate.

2. a kind of full-automatic assay device of fuel charger according to claim 1, it is characterized in that: described leveling module includes: double-shaft tilt angle sensor (11), X-axis motor (13), X-axis sliding screw (14), fixing leg (15), y-axis stepper motor (16), Y-axis sliding screw (17); Rotating shaft and the X-axis sliding screw (14) of X-axis motor (13) are linked by rotating disk, X-axis motor (13) rotational drives X-axis sliding screw (14) to rotate, and moves up and down thus realizing sliding screw (14); Rotating shaft and the Y-axis sliding screw (17) of y-axis stepper motor (16) are linked by rotating disk, y-axis stepper motor (16) rotational drives Y-axis sliding screw (17) to rotate, and moves up and down thus realizing sliding screw (17).

3. a kind of full-automatic assay device of fuel charger according to claim 1, it is characterised in that: described nozzle flow is automatically adjusted module and includes: oil gun fixed case (21), fuel charger oil gun (27), adjustment trigger gear; Described oil gun fixed case (21) front side is provided with case lid (28), the oil-feed mouth of pipe (23) is reserved in the side of described oil gun fixed case (21), the described oil-feed mouth of pipe (23) is available for described fuel charger oil gun (27) oil pipe and passes through, the opposite side of described oil gun fixed case (21) is provided with oil-out, the muzzle of described fuel charger oil gun (27) faces described oil-out, described oil-out connects flowline, and described flowline is provided with triangle electromagnetic valve (29);

It is internal that described adjustment trigger gear is arranged on described oil gun fixed case (21), including motor (22), stepper motor driver (23), slide plate (20), connecting rod (21), stir device (24), the output shaft end of described motor (22) is cased with circular slide plate (30), and output shaft is fixed with described slide plate (30) and is connected; One end of described connecting rod (31) is welded on described slide plate (30) circumference side, stirs device (24) described in the other end connection of described connecting rod (31);Described motor (22) drives the connecting rod (21) on slide plate (30) to rotate, make to stir device (24) to fiddle with the oil gun trigger (25) of described fuel charger oil gun (27), it is achieved the opening and closing of oil gun trigger (25).

4. a kind of full-automatic assay device of fuel charger according to claim 3, it is characterized in that: described embedded ARM processor (2) can send different pulses to described stepper motor driver (23), drive fuel charger gun trigger to turn to corresponding range district thereby through double; two plectrums; Described embedded ARM processor (2) and described triangle electromagnetic valve (29), be used for controlling uninterrupted.

5. a kind of full-automatic assay device of fuel charger according to claim 3, it is characterized in that: described in stir device (24) for double; two plectrums, described pair of plectrum is welded in described connecting rod (31), described oil gun trigger (25) is limited between described pair of plectrum, and the described pair of plectrum is perpendicular to the plane at described oil gun trigger (25) place.

6. a kind of full-automatic assay device of fuel charger according to claim 3, it is characterised in that: described slide plate (30) is circular foil member.

7. a kind of full-automatic assay device of fuel charger according to claim 1, it is characterized in that: also include solenoid valve control module, send signal by host computer verification system after having examined and determine and control electromagnetic valve (12) by arm processor and oil drain pump (18) carries out disposable oil extraction.

8. the liquid level image-recognizing method of the full-automatic assay device of a kind of fuel charger according to claim 1, it is characterised in that comprise the following steps:

Step 1, show that liquid pipe (7) and photographic head (8) are enclosed in camera bellows (41) inner, irradiate with strip source (42) and show liquid pipe (7), two sources of parallel light are put on the top of camera bellows, light can reflect light from air image concave meniscus, and the image of photographic head shooting has the outer wall concave line of a black at concave meniscus place;

Step 2, utilization utilizes photographic head (8) collection to show liquid pipe oil level line image, carry out the image gathered after obtaining liquid level image processing in real time in arm processor device (2): first image gray processing is processed, then make smoothing filter to image real time transfer with the two dimension discrete Gaussian function of zero-mean; Then rim detection is adopted to carry out the tolerance of grey scale change of image, detection and location, the detection realizing liquid level of the Canny edge detection algorithm in employing openCV; Calculate the pixels tall of liquid level, eventually pass and camera calibration calculating is converted to actual liquid level height.

9. the liquid level image-recognizing method of the full-automatic assay device of a kind of fuel charger according to claim 8, it is characterised in that described Canny edge detection algorithm specifically comprises the following steps that

Step 2.1, picture smooth treatment:, to image filtering, to remove the noise in image with Gaussian filter;

Step 2.2, seeks gradient algorithm: utilizes derivative operator to obtain gradient spoke value | G | and the direction e of each pixel, namely obtains intensity and the direction thereof at edge:

$\left|G\right|={\&lsqb;{\left(\frac{\&part;f}{\&part;x}\right)}^2+{\left(\right(\frac{\&part;f}{\&part;y}\left)\right)}^2\&rsqb;}^{\frac{1}{2}}$

$\mathrm{\&theta;}={\tan }^{-1}\&lsqb;\frac{\&part;f}{\&part;x}/\frac{\&part;f}{\&part;y}\&rsqb;$

F is filtered image;

Step 2.3, carries out non-maximum suppression to gradient;

Step 2.4, uses double; two thresholds method that all marginal points after non-maximum suppresses are processed;

Step 2.5, edge connects.

10. the leveling method of the full-automatic assay device of a kind of fuel charger according to claim 1, it is characterised in that in described leveling module, embedded ARM processor performs following steps:

Step a, with function fd1=open ("/dev/SPI ", O_RDWR) open the double-shaft tilt angle sensor collecting device of SPI communication mode, fd1 is the filec descriptor returned after double-shaft tilt angle sensor collecting device is opened;With function fd1=open ("/dev/GPIO ", O_RDWR) open I/O port equipment fd2 be after I/O port equipment is opened return filec descriptor;

Step b, utilizes read (fd1, buffer, 8) function to read the inclination value of double-shaft tilt angle sensor;

Step c, judges with if () function namely whether the inclination value of X-axis and Y-axis (collect 1024 for horizontal reference value) between 1020-1030 at ± 0.5 °;

Step d, if the value X > 1030 gathered, so by function iotrl (fd2, GPB5_ON, GPB6) GPB5 pin is set high position, making left Y-axis motor rotate forward, send 10* (x-1024) individual pulse to GPB6 pin, left Y-axis motor rotates the distance of corresponding deviation; If the value X < 1020 gathered, so by function iotrl (fd2, GPB5_OFF, GPB6) GPB5 pin is set low position, motor is made to reverse, sending 10* (x-1024) individual pulse to GPB6 pin, motor rotates the distance of corresponding deviation; If the value Y > 1030 gathered, so by function iotrl (fd2, GPB7_ON, GPB8) GPB7 pin is set high position, right side X-axis motor is made to rotate forward, sending 10* (x-1024) individual pulse to GPB8 pin, motor rotates corresponding distance; If the value Y < 1020 gathered, then by function iotrl (fd2, GPB7_OFF, GPB8) GPB7 pin is set low position, make right side X-axis motor reversion, send 10* (x-1024) pulse to GPB8 pin, rotate the distance of corresponding deviation; Cycle-index completes levelling function;

Step e, when value 1020 < X < 1030 (± 0.5 °) gathered, is in leveling state, finally uses close () functional relationships hull closure, quit a program.