JP5330932B2 - Spray measurement method and spray measurement device - Google Patents

Description

  The present invention relates to a spray measurement method and a spray measurement device for measuring a spray state of fluid ejected from an injector.

  In general, in a diesel engine, a direct-injection gasoline engine, or the like, the injection direction of fuel injected into a cylinder has a large meaning. For this reason, in this type of engine, it is required to accurately grasp the injection direction of the fuel injected from the fuel injection valve (injector).

  As a technique for measuring the fuel injection direction of an injector, for example, in Patent Document 1, surface light is irradiated perpendicularly to an injection axis extending from an injection port (nozzle) of an injector in the injection direction. A video camera with a certain angle with respect to the light is installed, and the spray cross-sectional image generated on the planar light is captured by the video camera, and the pixel at which the brightness of the spray cross-sectional image peaks is used as the spray center. A technique for defining and calculating the spray angle from the positional relationship between the spray center and the nozzle hole is disclosed.

  Here, in the technique of Patent Document 1, the following procedure is adopted as a processing method for calculating a luminance peak from spray image data in which a spray cross-sectional image is recorded.

  That is, first, for each pixel of the spray image data, a plurality of spray image data is added and averaged of luminance values. Next, pixel data having a certain luminance or less is deleted, only the spray cross-sectional image is extracted from the spray image data, and the contour is extracted. Next, by using a rotation process according to the angle of the video camera with respect to the planar light with the center of the contour as a reference, spray image data photographed from a position perpendicular to the planar light is generated. Then, the pixel having the highest luminance value in the spray cross-sectional image defined by the contour in the spray image data is selected and defined as the spray center.

Japanese Patent Laid-Open No. 10-148599

  However, the technique disclosed in Patent Document 1 described above may make it difficult to accurately specify the spray center depending on various settings during measurement. Specifically, for example, when saturation occurs in a pixel near the spray center on the spray cross-sectional image due to various conditions such as planar light setting, video camera setting, or spray droplet density, etc. In addition, a plurality of pixels having the highest luminance value may appear, making it difficult to specify the spray center precisely. In addition, for example, when sprays ejected from a plurality of nozzles are close to each other, a plurality of spray cross-sectional images to be extracted for each spray may be extracted as one spray cross-sectional image. In such a case, it may be difficult to specify the spray center precisely.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a spray measurement method and a spray measurement device that can accurately measure the injection direction of fluid injected from an injection device.

  The present invention relates to a spray measurement method for measuring an ejection direction of a fluid ejected from an ejection opening that opens to a nozzle of an ejection device, and ejects fluid from the ejection opening with respect to planar light perpendicular to the central axis of the nozzle. A spray cross-sectional image acquisition procedure for acquiring a spray cross-sectional image formed on the planar light, and a conical spray model based on the nozzle hole in the virtual space is defined and separated from the central axis A concentration distribution that decreases in weight as the spray model is applied to the spray model, and a concentration distribution that the spray model can form on the planar light for each angle by changing the angle of the spray model is used as a pseudo spray image. The pseudo spray image calculation procedure for each calculation is matched with each of the pseudo spray images within a predetermined region on the spray cross-sectional image, and the pseudo spray image that most closely matches the spray cross-sectional image corresponds. Characterized in that and a jetting direction calculation procedures for determining the directivity direction as the injection direction of the fluid of the central axis of the spray model.

  Further, the present invention is a spray measuring device for measuring a jet direction of a fluid jetted from a jet port opening in a nozzle of the jet device, wherein the fluid from the jet port is directed to a planar light perpendicular to the central axis of the nozzle. Spray cross-sectional image acquisition means for acquiring a spray cross-sectional image formed on the planar light when spraying the liquid, and in a virtual space, a conical spray model based on the injection port is defined, and its central axis The spray model is given a concentration distribution in which the weight decreases as the distance from the spray model increases, and the spray model changes the angle of the spray model so that the spray model can form a concentration distribution that can be formed on the planar light for each angle. A pseudo spray image calculating means for calculating each of the images as an image, and matching each of the pseudo spray images within a predetermined region on the spray cross-sectional image, to the pseudo spray image most closely matching the spray cross-sectional image The jetting direction calculation means for identifying the orientation of the central axis of the spray model response as the injection direction of the fluid, characterized by comprising a.

  According to the present invention, it is possible to accurately measure the ejection direction of the fluid ejected from the ejection device.

Schematic configuration diagram of spray measurement device Explanatory drawing showing the measurement system for image correction (A) is explanatory drawing which shows typically an example of the spray cross-sectional image acquired by imaging | photography, (b) is explanatory drawing which shows an example of the mist image for planar light intensity correction | amendment, (c) is image | photographed. (D) is an explanatory view schematically showing an example of a lattice image of (c) converted into a real space coordinate system, and (e) is an explanatory view of (c) and (d). (A) is an explanatory view showing the spray cross-sectional image of (a) corrected for distortion based on the relationship with (), (f) is an explanatory view showing the spray cross-sectional image after the averaging process Flowchart showing spray direction evaluation routine Flow chart showing spray cross-sectional image acquisition subroutine Flowchart showing a planar light intensity distribution correction processing subroutine Flow chart showing spray cross-sectional image distortion correction processing subroutine Flow chart showing spray angle calculation processing subroutine Conceptual image of simulated spray image Explanatory drawing showing an example of fuel concentration distribution approximated by Gaussian distribution

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings relate to an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a spray measuring device, FIG. 2 is an explanatory diagram showing a measurement system for image correction, and FIG. 3 (a) is a spray cross-sectional image acquired by photographing. FIG. 4B is an explanatory diagram schematically showing an example of the mist image for correcting the planar light intensity, and FIG. 4C is an explanatory diagram schematically showing an example of the captured grid image. (D) is an explanatory view schematically showing a grid image of (c) converted into a real space coordinate system, and (e) is a distortion correction based on the relationship between (c) and (d) ( FIG. 4 is an explanatory diagram showing a spray cross-sectional image of a), (f) is an explanatory diagram showing a spray cross-sectional image after the averaging process, FIG. 4 is a flowchart showing a spray direction evaluation routine, and FIG. 5 is a spray cross-sectional image acquisition subroutine. FIG. 6 is a flowchart showing a planar light intensity distribution correction processing subroutine. FIG. 7 is a flowchart showing a spray cross-sectional image distortion correction processing subroutine, FIG. 8 is a flowchart showing a spray angle calculation processing subroutine, FIG. 9 is a conceptual diagram of a pseudo spray image, and FIG. 10 is a fuel concentration distribution approximated by a Gaussian distribution. It is explanatory drawing which shows an example.

  A spray measurement device 1 shown in FIG. 1 measures the spray of fuel (fluid) injected from an injector 30 of an engine that is an example of an injection device. The injector 30 shown in this embodiment is for injecting fuel into a cylinder of a gasoline engine or a diesel engine, for example, and this injector 30 has a plurality (for example, five) of nozzle holes 32 at the tip of a nozzle 31. Have.

  The spray measurement apparatus 1 includes a light source device 5 that generates planar light 20, a holding mechanism 6 that holds an injector 30 at a set distance from the planar light 20, and an imaging device that captures the planar light 20. 7, a mist generator 8 that generates a mist 21 with respect to the planar light 20, and a control device 10 that controls these in a unified manner.

  For example, the light source device 5 includes a collimator lens, a diaphragm, a cylindrical lens (none of which is shown) and the like arranged in front of the semiconductor laser light source. For example, the light source device 5 is set so that the optical axis Ol is oriented in the horizontal direction, and generates light-screen-like planar light 20 that expands in a fan shape in the horizontal direction (see FIGS. 1 and 2).

  The holding mechanism 6 includes, for example, a substantially disc-shaped holding plate 6 a that holds the injector 30. For example, the holding plate 6a holds the injector 30 in a state in which the central axis On of the nozzle 31 is directed downward in the vertical direction orthogonal to the planar light 20 (optical axis Ol). Further, for example, a driving unit 6b incorporating a stepping motor or the like is connected to the holding plate 6a. Then, when the holding plate 6a is rotated by the drive unit 6b, the holding mechanism 6 can rotate the injector 30 around the central axis On of the nozzle 31.

  In the present embodiment, for example, as shown in FIG. 2, the direction of the central axis On of the nozzle is defined as the Z-axis direction. Further, a direction perpendicular to the Z axis and parallel to the optical axis Ol of the light source device 5 is defined as an X axis, and a direction perpendicular to the X axis and the Z axis is defined as a Y axis.

  The imaging device 7 includes a solid-state imaging device (CCD) and the like, and a main part is configured. For example, the imaging device 7 is disposed at a position spaced apart from the planar light 20 by a set distance. The optical axis Oc of the imaging device 7 is tilted upward by a set angle (for example, 45 °) with respect to the intersection of the central axis On of the nozzle 31 and the optical axis Ol of the light source device 5, for example. Set to direction.

  The control device 10 is mainly configured by a microcomputer having a CPU, a RAM, a ROM, and the like (not shown). In the ROM of the control device 10, a program for measuring the injection direction of the fuel injected from each nozzle port 32 of the nozzle 31 of the injector 30 is preset and stored, and the control device 10 stores the fuel according to this program. Measure the injection direction.

  That is, the control apparatus 10 injects fuel from the injector 30 and images the fuel visualized by reflection on the planar light 20 with the imaging apparatus 7. And the control apparatus 10 acquires the spray cross-sectional image of the fuel inject | poured into the planar light 20 from the injector 30 by performing various correction | amendment etc. with respect to a captured image (spray cross-sectional image) (spray cross-sectional image acquisition). procedure).

  Further, for example, as shown in FIG. 9, the control device 10 defines a conical pseudo spray model 25 having the nozzle hole 32 as a base point in the virtual space, and the weight decreases as the distance from the central axis increases. The concentration distribution of the pseudo fluid (fuel) is given to the spray model 25. Then, the control device 10 changes the angle (θx, θy) of the central axis Om of the spray model 25 with respect to the central axis On of the nozzle 31, and the spray model 25 is moved onto the planar light 20 for each angle (θx, θy). The density distribution (weight distribution) that can be formed is calculated as a pseudo spray image (pseudo spray image calculation procedure).

  Then, the control device 10 performs matching with each pseudo spray image within a set region on the actual spray cross-sectional image, and directs the central axis Om of the spray model 25 corresponding to the pseudo spray image that most closely matches the spray cross-sectional image. The direction is specified as the fuel injection direction from the nozzle 32 (spray direction calculation procedure).

  Thus, in this embodiment, the control apparatus 10 implement | achieves each function as a spray cross-sectional image acquisition means, a skill receiving spray image calculation means, and an injection direction calculation means.

Next, the fuel spray direction evaluation executed by the control device 10 will be described in detail with reference to the spray direction evaluation routine shown in FIG.
When this routine starts, the control device 10 first acquires a spray cross-sectional image 35a (see FIG. 3A) in step S101. The acquisition of the spray cross-sectional image 35a is executed, for example, according to the flowchart of the spray cross-sectional image acquisition subroutine shown in FIG. 5. When this subroutine starts, the control device 10 first issues a fuel injection instruction to the injector 30 in step S201. Do.

  Then, when the process proceeds from step S201 to step S202, the control device 10 checks whether or not a set time Δt (for example, a delay time of Δt = 1.5 msec) after instructing the fuel injection has elapsed. Specifically, for example, when the time at which the combustion injection is instructed is t1, the control device 10 determines whether or not the current time t is t1 + Δt.

  In step S202, the control device 10 stands by until the current time t reaches t1 + Δt, and when it is determined that the current time t has reached t1 + Δt, the control device 10 proceeds to step S203.

  When the process proceeds from step S202 to step S203, the control device 10 drives the imaging device 7 to take a spray cross-sectional image and records the spray cross-sectional image. That is, the control device 10 captures the cross-sectional image of the spray visualized by the crossing of the planar light 20 through the image capturing device 7, and records the captured spray cross-sectional image in the RAM.

  When the process proceeds from step S203 to step S204, the control device 10 checks whether or not the current imaging number N exceeds the preset number of times Image, and if it is determined that the number of imaging times N is less than the set number of times, step Return to S201.

  On the other hand, if it is determined in step S204 that the number of imaging times N has exceeded the set number of times, the control device 10 proceeds to step S205, and performs an averaging process using the spray sheets of Nimag images taken in step S203. After obtaining the spray cross-sectional image 35a, the subroutine is exited.

  In the main routine of FIG. 4, when the process proceeds from step S101 to step S102, the control device 10 drives the holding mechanism 6 and rotates the injector 30 by 180 ° around the central axis On of the nozzle 31, and then proceeds to step S103. The spray cross-sectional image 35b is acquired by the same process as in step S101 described above.

  In this case, in the measurement system of the present embodiment, the imaging device 7 is separated from the planar light 20 by a predetermined distance, and the imaging optical axis Oc is inclined with respect to the planar light 20. Each spray cross-sectional image on the acquired spray cross-sectional images 35a and 35b has a predetermined distortion. Further, since the planar light 20 is radiated in a fan shape and has a gradient in intensity, the acquired spray cross-sectional images 35a and 35b have a predetermined gradient in luminance.

  When the process proceeds from step S103 to step S104, the control device 10 performs correction processing of the luminance gradient caused by the intensity distribution of the planar light 20 on the spray cross-sectional images 35a and 35b acquired in step S101 and step S103, respectively. This correction processing is executed, for example, according to the flowchart of the planar light intensity distribution correction processing subroutine shown in FIG. 6. When this subroutine starts, the control device 10 drives the mist generator 8 in step S301. The mist 21 is generated (see FIG. 2), and in the subsequent step S302, the light source device is driven to irradiate the planar light 20. Here, in this embodiment, the mist 21 supplied from the mist generator 8 is supplied uniformly and continuously to the imaged region on the planar light 20, unlike the fuel spray injected from the injector 30. Is.

  In step S303, the control device 10 drives the imaging device 7 to capture the mist cross section visualized on the planar light 20 as a mist image, and record the mist image in the RAM.

  When the process proceeds from step S303 to step S304, the control device 10 checks whether or not the current number of times of imaging N exceeds the preset number of times, and if it is determined that the number of times of imaging N is less than the set number of times, step Return to S303.

  On the other hand, if it is determined in step S304 that the number of times of imaging N has exceeded the set number of times, the control device 10 proceeds to step S305 and performs an averaging process using each captured mist image, whereby the mist image 36 (FIG. 3 (b)).

  Then, when the process proceeds from step S305 to step S306, the control device 10 extracts the highest luminance value on the mist image 36, and divides the highest luminance value by the luminance value of each pixel to thereby obtain a surface corresponding to each pixel. The distribution of the light intensity correction coefficient (specificity distribution correction coefficient) is calculated.

  Then, when the process proceeds from step S306 to step S307, the control device 10 performs brightness correction on the spray cross-sectional images 35a and 35b by multiplying the spray cross-sectional images 35a and 35b by the uniqueness distribution correction coefficient, and then executes a subroutine. Exit.

  In the main routine of FIG. 4, when the process proceeds from step S104 to step S105, the control device 10 performs distortion correction processing on the spray cross-sectional images 35a and 35b whose luminance has been corrected in step S104. This distortion correction processing is executed, for example, according to the flowchart of the spray sectional image distortion correction processing subroutine shown in FIG. Here, prior to the execution of this subroutine, the reference grating 22 is set in the spray measurement device 1 at a set position on the same plane as the planar light 20 (see FIG. 2). When the subroutine starts, the control device 10 first drives the imaging device 7 in step S401 to capture the reference lattice image 37 (see FIG. 3C) and store the reference lattice image 37 in the RAM. To record.

  In step S402, the control device 10 calculates a conversion function for converting the spray cross-sectional images 35a and 35b into spray cross-sectional images corresponding to the real space coordinate system. That is, since the reference grid image 37 acquired in step S401 is acquired from a position that is not perpendicular to the planar light 20 (reference grid 22), there is distortion as shown in FIG. If the fact that the lattice spacing of the lattice 22 is known is used, the distortion can be corrected. Therefore, the control device 10 converts the captured reference grid image 37 into a real grid coordinate system 38 (see FIG. 3D) with a predetermined resolution, thereby converting it into the real space coordinate system. Calculate the function.

  Then, when the process proceeds to step S403, the control device 10 uses the converted coordinates calculated in step S402 to spray the cross-sectional images 39a and 39b in the real space coordinate system from the spray cross-sectional images 35a and 35b (see FIG. 3E). In step S404, the calculated spray cross-sectional images 39a and 39b are converted into image data, and the subroutine is exited. Thereby, the distortion of the spray cross-sectional images 35a and 35b acquired in step S101 and step S103 can be accurately removed.

  In the main routine of FIG. 4, when the process proceeds from step S105 to step S106, the control device 10 rotates either one of the spray cross-sectional images 39a and 39b (for example, the spray cross-sectional image 39b) by 180 ° and adds to these. By performing the averaging process, a final spray cross-sectional image 40 (see FIG. 3F) is acquired.

  And if it progresses to step S107 from step S106, the control apparatus 10 will perform the spray angle calculation process of the injector 30 using the spray cross-sectional image 40 acquired by step S106. This spray angle calculation process is executed, for example, according to the flowchart of the spray angle calculation subroutine shown in FIG. 8, and when this subroutine starts, the control device 10 first performs binary processing on the spray cross-sectional image 40 in step S501. Process. That is, the control device 10 checks the luminance of each pixel on the spray cross-sectional image in order to reduce the calculation load thereafter, for example, sets the luminance of a pixel whose luminance is equal to or higher than the set threshold to “1”. The following binarization process is performed to set the luminance of the pixel to “0”.

  Then, when the process proceeds from step S501 to step S502, the control device 10 displays, for example, a predetermined area in which pixels with luminance “1” are distributed at a set density or higher on the binarized spray cross-sectional image 40. 23 is extracted. In this case, for example, in the present embodiment in which the injectors 30 having the nozzle holes 32 open at five locations on the nozzle 31 are to be inspected, the spray regions 23 are normally extracted at five locations on the spray cross-sectional image.

  Then, when the process proceeds from step S502 to step S503, the control device 10 selects one spray area 23 from the extracted spray areas 23, and in the subsequent step S504, the angle (from the nozzle 32 to the point on the injection area ( The minimum value of θx, θy) is set as an initial value.

  Then, when the process proceeds from step S504 to step S505, the control device 10 can be formed on the planar light 20 when it is assumed that the fuel is injected at the injection angle (θx, θy) in the virtual space. A spray image (pseudo spray image 26) is calculated.

  That is, in step S505, the control device 10 defines a conical spray model 25 (see FIG. 9) in which the angle of the central axis Om extending from the nozzle 32 is (θx, θy), and the spray model 25 On the other hand, a concentration distribution in which the weight decreases as the distance from the central axis Om increases. As this concentration distribution, for example, a two-dimensional Gaussian distribution (see FIG. 10) or the like can be suitably used. Then, the control device 10 calculates a concentration distribution that the spray model 25 can form on the planar light 20 as the pseudo spray image 26.

  Then, when the process proceeds from step S505 to step S506, the control device 10 calculates a cross-correlation coefficient C (θx, θy) between the spray cross-sectional image and the pseudo spray image 26 by a known convolution calculation or the like. More specifically, the control apparatus 10 determines the mutual distribution between the luminance distribution of the image (spray cross-sectional image) on the spray cross-sectional image in the region corresponding to the pseudo spray image 26 and the concentration distribution (luminance distribution) of the pseudo spray image 26. Correlation coefficient C (θx, θy) is calculated.

  In step S507, whether or not the cross-correlation coefficient C calculated this time in step S506 is larger than the maximum value Cmax of the cross-correlation coefficient up to the previous time is checked. If it is equal to or less than the maximum value Cmax of the cross-correlation coefficients until, the control device 10 jumps directly to step S510.

  On the other hand, in step S507, when the cross-correlation coefficient C calculated this time is larger than the maximum value Cmax until the previous time, the control device 10 proceeds to step S508, and the cross-correlation coefficient calculated this time is the maximum value Cmax of the cross-correlation coefficient. In the subsequent step S509, the angle (θcx, θcy) of the central axis Om corresponding to the maximum value of the cross-correlation coefficient C is updated with the angle (θx, θy) of the current central axis. Proceed to step S510.

  Then, when the process proceeds from step S507 or step S509 to step S510, the control device 10 updates the value of the angle (θx, θy) of the central axis Om, and then proceeds to step S511. In updating the angles (θx, θy), the angle θx in the X-axis direction or the angle θy in the Y-axis direction is sequentially changed by a minute angle Δθ (for example, Δθ = 0, 1 °) in the spray region 23. Is done.

  Then, when the process proceeds from step S510 to step S511, the control device 10 calculates the cross-correlation coefficient C for all combinations in which the angle (θx, θy) is changed by the minute angle Δθ in the currently selected spray region 23. It is checked whether or not the calculation has been completed, and if it is determined that the calculation has not been performed for all angle combinations, the control device 10 returns to step S505.

  On the other hand, if it is determined in step S511 that the cross-correlation coefficient C has been calculated for all angle combinations in the currently selected spray region 23, the control device 10 proceeds to step S512, and the current cross-correlation coefficient is obtained. The direction in which the central axis Om is directed by the angle (θcx, θcy) corresponding to the maximum value Cmax is specified as the injection direction from the corresponding nozzle 32, and the maximum value Cmax of the cross-correlation coefficient is cleared.

  Then, when the process proceeds from step S512 to step S513, the control device 10 checks whether or not the injection direction has been specified in all the spray regions 23.

  If it is determined in step S512 that the injection direction is not specified in all the spray regions 23, the control device 10 returns to step S505.

  On the other hand, if it is determined in step S513 that the injection direction has been specified in all the spray regions 23, the control device 10 exits the subroutine.

  In the main routine of FIG. 4, when the process proceeds from step S107 to step S108, the control device 10 checks whether or not the injection direction of each nozzle 32 is within a preset tolerance, and all the injection directions are within the tolerance. If there is, the process proceeds to step S109, and after determining that the current injector 30 to be inspected is a normal product, the routine exits. On the other hand, if the injection direction of at least one of the nozzle holes 32 is outside the tolerance in step S108, the control device 10 proceeds to step S110 and determines that the current injector 30 to be inspected is an abnormal product. Then exit the routine.

  According to such an embodiment, the spray cross-sectional image 40 formed on the planar light 20 when fuel is injected from the nozzle 32 in real space is acquired, and the nozzle 32 is set as a base point in the virtual space. A conical spray model 25 is defined and a concentration distribution comprising a two-dimensional Gaussian distribution or the like is given to the spray model 25, and the angle of the spray model 25 is changed so that the spray model 25 is converted into the planar light 20 for each angle. Concentration distributions that can be formed above are respectively calculated as pseudo spray images 26 and matched with each pseudo spray image 26 in the spray region 23 extracted on the spray cross-sectional image 40, and the pattern on the spray cross-sectional image 40 is the most By specifying the directing direction of the central axis Om of the spray model 25 corresponding to the coincident pseudo spray image 26 as the fuel injection direction, the injection direction of the fuel injected from the injector 30 is determined. It is possible to be measured every time.

  That is, since the fuel injection direction of the present embodiment is determined not by the peak value detection that searches for the pixel having the highest luminance on the spray cross-sectional image in order, but by the peak value detection by luminance distribution matching, It is robust even for an image having a plurality of maximum luminance values, and has high accuracy because it has a sub-pixel peak detection resolution. Furthermore, even when the spray is close, suitable peak detection can be realized.

  In this case, for example, as shown in the above-described processing of steps S101, S103, S104, etc., imaging is performed a plurality of times (Image times), and a plurality of pieces of image data are subjected to an averaging process, thereby stabilizing The sprayed cross-sectional images 35a and 35b, the mist image 36, and the like can be obtained.

  Further, for example, as shown in the above-described processing of steps S101, S103, etc., since the fuel injection is instructed after the delay time Δt has elapsed since the fuel injection is instructed to the injector 30, a suitable spray cross-sectional image is captured. be able to.

  Further, for example, as shown in the above-described processing of steps S101, S103, etc., the spray cross-sectional images 35a, 35b when the arrangement of the injector 30 is different by 180 ° around the central axis On of the nozzle 31 are acquired, respectively. In step S106, these are added and averaged to obtain a final spray cross-sectional image, thereby obtaining a spray cross-sectional image in which the influence of attenuation of the intensity of the planar light 20 according to the distance from the light source device 5 is reduced. can do.

  Further, for example, as shown in the process of step S104, the mist image 36 is obtained by supplying a uniform spray such as water mist to the space irradiated with the planar light 20, for example. By correcting the brightness of the spray cross-sectional images 35a and 35b with the intensity distribution normalized with the maximum brightness value on the image 36, the influence of the intensity distribution of the planar light 20 can be accurately removed from the spray cross-sectional images 35a and 35b. Can do.

DESCRIPTION OF SYMBOLS 1 ... Spray measuring device 5 ... Light source device 6 ... Holding mechanism 6a ... Holding plate 6b ... Drive unit 7 ... Imaging device 8 ... Mist generator 10 ... Control device (spray cross-sectional image acquisition means, pseudo spray image calculating means, injection direction calculation) means)
DESCRIPTION OF SYMBOLS 20 ... Planar light 21 ... Mist 22 ... Reference lattice 23 ... Spray area 25 ... Spray model 26 ... Pseudo spray image 30 ... Injector 31 ... Nozzle 32 ... Injection hole 35a, 35b ... Spray cross-sectional image 36 ... Mist image 37 ... Reference lattice image 38 ... Reference lattice image 39a, 39b ... Spray cross-sectional image 40 ... Spray cross-sectional image

Claims (5)

A spray measurement method for measuring a jet direction of a fluid jetted from a jet port opening in a nozzle of a jet device,
A spray cross-sectional image acquisition procedure for acquiring a spray cross-sectional image formed on the planar light when a fluid is ejected from the nozzle with respect to the planar light perpendicular to the central axis of the nozzle;
In the virtual space, a conical spray model with the nozzle hole as a base point is defined, and a concentration distribution in which the weight decreases as the distance from the central axis is given to the spray model, and the angle of the spray model is changed. A pseudo spray image calculation procedure for calculating, as a pseudo spray image, a density distribution that the spray model can form on the planar light for each angle,
Matching with each of the pseudo spray images within a predetermined region on the spray cross-sectional image, the direction of the central axis of the spray model corresponding to the pseudo spray image most closely matching the spray cross-sectional image is jetted of the fluid A spray measurement method comprising: an injection direction calculation procedure that is specified as a direction.   The spray measurement method according to claim 1, wherein the pseudo spray image calculation procedure sets a concentration distribution of the spray model based on a two-dimensional Gaussian distribution.   The injection direction calculation means calculates a correlation coefficient of each pseudo spray image with respect to the spray cross-sectional image, and determines a directivity direction of a central axis of the spray model corresponding to the pseudo spray image having the maximum correlation coefficient. The spray measurement method according to claim 1, wherein the spray measurement direction is specified as the fluid ejection direction.   2. An abnormal product detection procedure for detecting the corresponding injection device as an abnormal product when the fluid injection direction specified by the spray direction calculating means is outside a preset range. The spray measurement method according to claim 1. A spray measuring device for measuring a jet direction of a fluid jetted from a nozzle opening in a nozzle of a jet device,
Spray cross-sectional image acquisition means for acquiring a spray cross-sectional image formed on the planar light when a fluid is ejected from the nozzle with respect to the planar light perpendicular to the central axis of the nozzle;
In the virtual space, a conical spray model with the nozzle hole as a base point is defined, and a concentration distribution in which the weight decreases as the distance from the central axis is given to the spray model, and the angle of the spray model is changed. Pseudo spray image calculating means for calculating, as a pseudo spray image, a concentration distribution that the spray model can form on the planar light for each angle,
Matching with each of the pseudo spray images within a predetermined region on the spray cross-sectional image, the direction of the central axis of the spray model corresponding to the pseudo spray image most closely matching the spray cross-sectional image is jetted of the fluid A spray measuring device comprising: an injection direction calculating means for specifying a direction.