JP2005351730A - System for determining set state of car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system 1 for determining the set state of a car 4, hard to break, and capable of eliminating the need for accurate setting, being not only suitable for full automation, but also acquiring various items of data on the state of the car 4. <P>SOLUTION: The system 1 for determining the set state of the car 4 is provided with both an image processing part 5 for processing image data acquired by imaging a side surface of a tire 3 and computing tire edge data, indicating the edge of the tire 3 and a determination part 6 for determining whether the state of the tire satisfies prescribed conditions, on the basis of the tire edge data computed by the image processing part 5 and computing state determination data indicating determination results. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention detects the installation state of a vehicle including abnormal states such as tires and bursts in a vehicle performance test such as an exhaust gas test performed on a vehicle traveling on a pseudo traveling road such as a chassis dynamometer or a drum tester. The present invention relates to a vehicle installation state determination device.

  Well-known driving test apparatuses for running and testing vehicles such as automobiles indoors include a chassis dynamometer and a drum tester as a simpler apparatus. In a vehicle performance test performed using such an apparatus, and particularly in an exhaust gas measurement test, an automatic driving system using a conventional driving robot has already been developed, and some automation has already been achieved. Recently, there has been an increasing demand for fully automated driving tests, including vehicle entry into the measurement room, and in response to such unattended system installation, vehicle installation including detection of abnormal situations A means for detecting the state is required.

  One of the sensors that can be used as such a detection means is, for example, a tire / burst sensor. However, the conventional mechanical type is a contact type, so it is fragile and is pre-adapted according to the vehicle type to be tested. However, it is necessary to make settings such as arranging the sensor at an accurate position.

  In addition, as shown in Patent Document 1, there is also known a tire burst detection using a non-contact type that measures distance by bounce of infrared rays. It is necessary to set to, and is not suitable for full automation.

Furthermore, in full automation, it is necessary to detect not only tires and bursts, but also various vehicle installation conditions, such as whether the vehicle installation position is correct and whether it is firmly fixed as described above. The tire / burst sensor has a disadvantage that only the tire / burst can be handled.
JP2002-139408

  Therefore, the present invention is not only difficult to break in a vehicle performance test, does not require an accurate setting by a person, is suitable for full automation, and obtains various data related to a vehicle based on the state of a tire. The main object is to provide a vehicle installation state determination device that can be used.

  That is, the present invention is used with a vehicle test apparatus for performing a performance test by rotating a tire of a vehicle installed on a pseudo traveling road such as a drum or a belt, and an image obtained by imaging a side surface of the tire. An image processing unit that processes data and calculates tire edge data representing an edge of the tire, and based on the tire edge data calculated by the image processing unit, the state of the tire satisfies a predetermined condition And a determination unit that calculates state determination data representing a determination result.

  If it is such, since it is non-contact if it uses, for example as a tire burst sensor, there is no need to make a limit switch etc. contact a vehicle and it is hard to break. Moreover, in order to recognize an image, the side surface of a tire should just appear in the image, and it is not necessary to change arrangement | positioning of the part which images according to a vehicle model. In addition, because software processing is performed, using common hardware, for example, determination of tire burst, determination of whether the tire is centered, determination of whether the tire is lifted up from the simulated road Various determinations such as these can be performed, and multi-functionalization is easy. And since it has these features, it is suitable for fully automated vehicle performance testing. Furthermore, although the process uses an image, since various states such as an abnormality are determined based only on edges, the determination process is unlikely to be complicated.

  The determination unit stores a reference edge data storing reference edge data representing an edge serving as a reference for determining a tire state, the reference edge data, and the tire edge data. The edge comparison unit that calculates edge comparison data representing the comparison result and the edge comparison data calculated by the edge comparison unit determines whether or not the tire condition satisfies a predetermined condition It is preferable to include a determination unit main body that calculates state determination data representing the determination result.

  If this is the case, for example, it is possible to compare the edge of a normal tire with the edge of a vehicle tire during a performance test, so it is easy to detect changes and abnormalities that appear on the edge during the performance test. Can be detected.

  If such a configuration is adopted, for example, when the reference edge data stored in the reference edge data storage unit simulates a normal tire edge as a circle, the circle or arc or the like is used. By using the graphic data to represent, for example, it is possible to detect the deformation of the tire edge during a burst and know the burst.

  For example, if the reference edge data stored in the reference edge data storage unit is obtained by imaging a normal tire, the tire bursts and the edge is deformed during the performance test. Can be detected.

  Further, if the stored reference edge data is compared with the tire edge data, the edge comparison unit determines that the area created by the edge represented by the reference edge data and the tire edge data are What is necessary is just to calculate the difference with the area which the edge to represent calculates as edge comparison data.

  In this way, for example, it is possible to determine whether or not there is a burst from the area of the tire side surface that decreases as the gas escapes from the tire during a burst and the volume decreases.

  Further, the image processing unit processes image data obtained by imaging the side surface of the pseudo traveling road, calculates pseudo traveling road edge data representing an edge of the pseudo traveling road, and the reference The reference edge data stored in the edge data storage unit may be the pseudo traveling road edge data.

  If it is such, it will be possible to determine whether or not the tire is in a position that satisfies a predetermined condition with respect to the simulated traveling road.

  Another configuration is also conceivable. For example, the determination unit calculates tire specific point data indicating the position of a center point of a tire based on the tire edge data, and the tire specific point data calculating unit. A determination unit main body that determines whether or not the state of the tire satisfies a predetermined condition based on a position of a tire specific point indicated by the point data, and calculates state determination data representing a determination result. It does not matter.

  If this is the case, for example, since the burst determination process is performed by detecting that the center point of the tire has been lowered since the start of the performance test, the determination process may be simplified. it can.

  And in order to detect that the center point of the tire has fallen, the determination unit stores reference point data representing the coordinates of a point serving as a reference for determining the state of the tire. The reference point data and the tire specific point data are compared, a specific point comparison unit for calculating specific point comparison data representing a comparison result, and the specific point comparison data calculated by the specific point comparison unit If it is provided with a determination unit main body that determines whether or not the condition of the tire satisfies a predetermined condition and calculates state determination data representing the determination result, a point to be used as a reference is determined. It is possible to easily determine by storing the reference point data indicating the coordinates.

  Here, for example, the reference point data stored in the reference point data storage unit may be obtained by imaging a normal tire.

  Further, for example, the position of the tire specific point during the performance test may be compared with the position of the pseudo traveling road as a reference.

  That is, the image processing unit processes image data obtained by capturing an image of the side surface of the pseudo traveling road, and calculates pseudo traveling road edge data representing an edge of the pseudo traveling road. A pseudo-travel indicating a position of a pseudo travel path specific point that is a point that can be identified from an edge of the pseudo travel path, such as a center point of the pseudo travel path, from the pseudo travel path edge data calculated by the image processing unit A pseudo driving road specific point data calculating unit for calculating road specific point data, wherein the reference point data stored in the reference point data storage unit is calculated by the pseudo driving road specific point data calculating unit; The road specific point data may be used.

  If this is the case, not only as a tire burst sensor, but also when lifting the vehicle during warm-up operation of the simulated driving path, a lift that determines and confirms whether the tire is completely away from the simulated driving path It can also be used as an up determination device. Further, when the pseudo traveling path is a single-axis drum, it can also be used as a centering determination device that determines and confirms whether the vehicle is accurately centered when the vehicle is installed on the single-axis drum.

  As described above, if the tire specific point is calculated, the determination unit further detects the position of the tire in the front-rear direction based on the tire specific point data calculated by the tire specific point data calculation unit. And determining whether or not the vehicle is vibrating based on the front-rear direction position detection unit that calculates front-rear direction position data representing the detection result, and the front-rear direction position data calculated by the front-rear direction position detection unit, By providing a vibration determination unit that calculates vibration determination data representing the determination result, it is possible to detect the looseness of the vehicle fixture from the back and forth of the tire.

  Various function expansions can be considered for the vehicle installation state determination device. For example, when performing a performance test of a vehicle, for example, in the case of a four-wheel drive vehicle, it is necessary to move a pseudo traveling path provided before and after the vehicle so as to match the tire interval of the vehicle. In such a case, the side surface of the tire and the side surface of the pseudo traveling road are imaged, and an imaging unit that outputs image data representing the captured image is provided, and the pseudo traveling road is movable, The imaging unit may be provided with a fixed relative position with respect to the pseudo traveling path.

  If this is the case, the imaging unit moves together with the pseudo traveling road, and the pseudo traveling road and the side surface of the tire placed thereon can always be imaged, which makes it easy to automate the arrangement of the imaging unit. .

  However, it is necessary to confirm that the tire is on the simulated traveling path.

  If the vehicle installation state determination device is used for such a purpose, the imaging unit images the side surface of the tire and the side surface of the pseudo traveling road, and outputs image data representing the captured image. A position comparison unit that compares the position of the tire determined by the tire edge data output from the image processing unit with the position of the pseudo traveling road and calculates position comparison data representing a comparison result. And a position determination unit that determines whether or not the tire is on the pseudo traveling road based on the position comparison data calculated by the position comparison unit, and calculates position determination data representing the determination result. I just need it.

  Further, in the vehicle performance test, if it is intended to be used as a tire slip determination device that detects whether the tire is idling or locked, for example, the determination unit may use a tire based on the tire edge data. A tire specific point data calculation unit for calculating tire specific point data indicating the position of the center point of the tire, and based on the position of the tire specific point indicated by the tire specific point data, the rotational speed data relating to the rotation speed of the tire A rotation speed data calculation unit for calculating

  If it is such, the number of rotations per unit time of the tire can be calculated based on, for example, tire specific points that rotate with a constant period or appear at a predetermined place at a constant time interval.

  Alternatively, the image processing unit processes image data obtained by imaging the side surface of the tire, and calculates pattern data representing a predetermined pattern provided on the tire side surface, and the determination unit However, based on the pattern data, a pattern detection unit that calculates rotation number data related to the rotation number of the tire, the rotation number data calculated by the pattern detection unit, and the tire diameter, A vehicle speed calculation unit that calculates speed data representing the assumed speed may be provided.

  Furthermore, if it is intended to be used as a temperature determination device for determining abnormal heating of a tire or a brake, an imaging unit that captures an image of a side surface of the tire and outputs image data representing the captured image is provided. The unit includes an imaging unit including an infrared thermometer that measures the temperature at a predetermined position of the tire and outputs temperature data representing a measurement result, and the determination unit outputs the non-contact thermometer. What is necessary is just to provide the abnormal heating determination part which determines the abnormal heating determination data showing the determination result which determines abnormal heating of a tire and / or a brake based on the temperature data to perform.

  According to such a vehicle installation state determination device, the vehicle performance test is not easily broken because it is non-contact. In addition, since the position of the edge is recognized from the image, it is not necessary for the person to accurately arrange the sensors according to the vehicle type, and erroneous detection and detection errors are unlikely to occur. Furthermore, it is suitable for full automation because it is easy to be multi-functionalized by software. Since each determination is performed based on the edge, it is possible to perform a simple process while using image recognition.

  <First Embodiment>

  A first embodiment of the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, the vehicle installation state determination device 1 according to the present embodiment is a chassis for measuring the performance related to the fuel consumption, exhaust gas components and the like of the vehicle 4 under substantially the same conditions as actually running on the road. It is used together with the dynamometer P to monitor various conditions including tire abnormalities.

  Here, the chassis dynamometer P used with the vehicle installation state determination device 1 according to the present embodiment will be described.

  The chassis dynamometer P includes a floor plate (not shown), a frame body (not shown) having the floor plate at the top, a uniaxial drum 2 that is a pseudo traveling path, and a safety fence M. The floor plate has a rectangular opening only at a portion corresponding to the uniaxial drum 2, and a certain region including the top of the uniaxial drum 2 faces downward from the opening. The top of the uniaxial drum 2 is set to be substantially the same height as the floor plate F. The safety fence M is provided on the side of the opening on the floor so as to be parallel to the side surface of the uniaxial drum 2.

  At the start of the vehicle performance test, the drive tire 3 of the vehicle 4 is placed on the uniaxial drum 2 and measurement is performed by rotating the tire 3.

  Thus, the vehicle installation state determination device 1 is connected to the imaging unit 7 installed in the safety fence M and the imaging unit 7, and a state determination computer that configures the image processing unit 5 and the determination unit 6 shown in FIG. N. In FIG. 1, the imaging unit 7 (2) is connected to a state determination computer N via a floor plate (not shown) located below the vehicle 4.

  FIG. 3 is a configuration diagram illustrating a hardware configuration of the state determination computer N. As illustrated in FIG. As shown in FIG. 1, the vehicle installation state determination device 1 is, for example, a general-purpose computer, and includes a CPU 101, an internal memory 102, an external storage device 103 such as an HDD, a communication interface 104 such as a modem for connecting to a communication network, A display 105, an input means 106 such as a mouse and a keyboard, and the like are provided.

  Therefore, in the present embodiment, as shown in FIG. 2, a predetermined program is installed in the state determination computer N, and the CPU 101 and peripheral devices work together based on the program, thereby enabling the image processing unit 5 and the determination. It is made to function as the part 6 grade | etc.,.

  Hereinafter, each part will be described in detail with reference to FIG.

  The imaging unit 7 images the side surface of the tire 3 and the side surface of the uniaxial drum 2 and outputs image data representing the captured image, and is, for example, a CCD camera. Further, an infrared thermometer such as an infrared camera or an infrared detector is provided, and the temperature at a predetermined position of the tire 3 is measured, and temperature data representing the measurement result is output. By attaching the imaging unit 7 to the safety fence M, the relative position with respect to the uniaxial drum 2 is fixed, and the top side surface of the uniaxial drum 2 is always captured in front and imaging is possible.

  In the present embodiment, a total of two units, a right imaging unit 7 (1) and a left imaging unit 7 (2), are provided and both are connected to the computer N.

  The image processing unit 5 processes the image data representing the side surfaces of the tire 3 and the uniaxial drum 2, and tire edge data representing the edge of the tire 3 appearing in the image and pseudo road edge data representing the edge of the uniaxial drum 2. Such edge data is calculated, and the planar and geometric features can be grasped from the images representing the side surfaces of the tire 3 and the uniaxial drum 2. Also, image processing for pattern detection is performed, and pattern data representing the pattern is calculated.

  In the present embodiment, density conversion of the image data output from the imaging unit 7 is performed to obtain a binarized image, and after noise removal processing, an edge is extracted as a line having a minimum line width by thinning, Tire edge data representing the boundary between the tire 3 and the uniaxial drum 2 and pseudo-running road edge data are calculated by making up for the lack of the extracted edge. When performing this processing, it is assumed that the shape of the tire 3 or the uniaxial drum 2 is a substantially circle or a substantially arc in advance, thereby improving the accuracy of the image processing.

  The edge here is not limited to the outer periphery of the tire 3, but includes, for example, an inner periphery to which the wheel is attached, a joint between the wheel and the tire 3, a hole provided in the wheel, and the like. In the present embodiment, the tire edge data is data having an accuracy that enables recognition of a tire space boundary that is a boundary between the tire 3 and the one that does not constitute the tire 3 such as the space under the uniaxial drum 2 or the vehicle 4. It is sufficient if it is sufficient, but it does not matter even if the data has such a high accuracy that the rotation angle of the tire 3 can be recognized. The same applies to the pseudo road edge data.

  Based on the tire edge data calculated by the image processing unit 5, the determination unit 6 determines whether the tire 3 is in a predetermined state, such as whether there is an abnormality, and state determination data representing the determination result For example, it is possible to determine various states such as whether the tire is bursting, whether it is in a normal position, whether it is fixed correctly, or the like. Further, it has expandability for enabling multi-function based on image data output from the imaging unit 7 and the like and output from the image processing unit 5.

  More specifically, the determination unit 6 determines and measures various states of the tire 3, and includes a reference edge / data storage unit 8, an edge comparison unit 9, and a determination unit main body A, and further includes a uniaxial drum 2. The position comparison unit H and the position determination unit I are used to determine whether or not the tire 3 is properly supported, and the pattern detection unit J and the vehicle speed calculation unit K are used to recognize the slipping degree and the lock of the tire 3. And an abnormal heating determination unit L for determining abnormal heating of the tire 3 and the brake. In addition, the image data output from the two imaging units is set to be processed independently.

  The reference edge data storage unit 8 stores reference edge data representing an edge serving as a reference.

  In the present embodiment, the normal tire 3 before starting the performance test of the vehicle 4 is imaged in advance, and the edge data representing the edge of the tire 3 calculated by the image processing unit 5 is stored as reference edge data. I have to. When the tire 3 is photographed from the side, the shape is generally circular, and the shape of the portion of the lower portion of the tire 3 that contacts the uniaxial drum 2 is deformed and cannot maintain a circular shape during bursting. Is assumed to be a circle, and as a reference edge data, a circle representing the normal shape of the tire 3 and graphic data representing an arc representing the shape of the lower portion of the tire 3 may be stored. It is enough. At this time, if appropriate reference edge data is stored on the basis of the vehicle data indicating the vehicle 4, it is used for automation. If reference edge data representing the edge of the uniaxial drum 2 is used, the positional relationship between the uniaxial drum 2 and the tire 3 can be determined.

  The edge comparison unit 9 compares the reference edge represented by the reference edge data with the edge of the tire 3 under performance test represented by the edge data, and calculates edge comparison data representing a comparison result. .

  In the present embodiment, by using the top of the tire 3 as a reference, the edge of the normal tire 3 represented by the reference edge data shown in FIG. 4A is overlapped with the edge of the tire 3 represented by the edge data. As shown in FIG. 4B, for example, an area difference of the tire 3 that has changed due to a burst is obtained and calculated as comparison data. The area difference is indicated by diagonal lines in the figure.

  Instead of comparing the area differences, the edge shapes indicated by the reference edge data and the edge data may be compared.

  Based on the edge comparison data calculated by the edge comparison unit 9, the determination unit main body A determines whether or not the tire 3 is in a state that satisfies a predetermined condition, such as whether or not there is an abnormality, and determines the determination result. State determination data to be expressed is calculated. In the present embodiment, for example, when the area difference represented by the edge comparison data is equal to or larger than a predetermined value, it is determined that the state is abnormal such as a burst.

  The position comparison unit H compares the position of the tire 3 determined by the tire edge data output from the image processing unit 5 with the position of the uniaxial drum 2 and calculates position comparison data representing a comparison result. . In the present embodiment, the length and direction in which the center point of the tire 3 and the center point of the uniaxial drum 2 are separated in the horizontal direction are calculated as position comparison data.

  The position determination unit I determines whether the tire 3 is on the uniaxial drum 2 based on the position comparison data calculated by the position comparison unit H, and calculates position determination data representing a determination result. is there. In this embodiment, since the uniaxial drum 2 is used for the pseudo traveling path, the vehicle 4 is disposed at a position where the vehicle 4 can appropriately perform the performance test because the distance between the two center points indicated by the position comparison data is equal to or less than a predetermined value. It is determined that it is being done.

  The pattern detection unit J calculates rotational speed data related to the rotational speed of the tire based on the pattern data calculated by the image processing unit 5.

  In the present embodiment, for example, a tread pattern appearing on the side surface of the tire 3 or a hole provided in the wheel is detected, and the rotation speed of the tire is calculated from a cycle in which the predetermined pattern appears at a predetermined position. ing. If the pattern can be detected, the pattern data may be the same as the tire edge data.

  The vehicle speed calculation unit K is based on the rotation speed data calculated by the pattern detection unit J and the distance from the diameter of the tire 3 appearing in the edge image to the pattern position indicated by the pattern position data. Speed data representing the assumed speed is calculated. The diameter can be known, for example, by comparing with the edge of the uniaxial drum 2 having a known size. The diameter can be calculated based on tire edge data.

  The abnormal heating determination unit L determines abnormal heating of the tire 3 and / or the brake based on the temperature data output from the imaging unit 7, and calculates abnormal heating determination data representing the determination result.

  Hereinafter, an example of the operation of the vehicle installation state determination apparatus 1 according to the present embodiment will be described using each flowchart with reference to FIG.

  First, the vehicle 4 for performance test is placed at a predetermined position of the chassis dynamometer P, so that the tire 3 is placed on the pseudo driving path that is the uniaxial drum 2, and it is confirmed that the tire 3 is properly placed according to the following procedure. To do. A corresponding flowchart is shown in FIG.

  The imaging unit 7 images the side surfaces of the tire 3 and the uniaxial drum 2 and outputs image data (step Sa1).

  The image processing unit 5 calculates edge data representing the edges of the tire 3 and the uniaxial drum 2 based on the image data (step Sa2).

  The position comparison unit H compares the positions of the tire 3 and the uniaxial drum 2 based on the edge data, and calculates position comparison data (step Sa3).

  The position determination unit I determines whether the tire 3 is appropriately disposed on the uniaxial drum 2 based on the position comparison data, and calculates the determination result as position determination data (step Sa4).

  Next, after confirming that the tire 3 is properly disposed on the uniaxial drum 2, before starting the performance test of the vehicle 4, the normal tire 3 is previously stored in the reference edge data storage unit 8 in the following procedure. The reference edge data representing the edge of is stored. A corresponding flowchart is shown in FIG.

  The imaging unit 7 images the side surfaces of the tire 3 and the uniaxial drum 2 and outputs image data (step Sb1).

  The image processing unit 5 calculates edge data representing an edge based on the image data (step Sb2).

  The reference edge data storage unit 8 stores the edge data as reference edge data (step Sb3).

  And after starting a vehicle performance test, each determination and measurement operation | movement of the following procedures are repeated. A corresponding flowchart is shown in FIG.

  The imaging unit 7 images the side surfaces of the tire 3 and the uniaxial drum 2, measures the temperature of the tire 3 using infrared rays, and outputs image data and temperature data (step Sc1).

  The image processing unit 5 calculates edge data representing an edge based on the image data (step Sc2).

  The edge comparison unit 9 compares the edge data with the reference edge data, and calculates edge comparison data (step Sc3).

  The determination unit main body A determines whether or not there is a burst based on the edge comparison data, and calculates state determination data representing the determination result (step Sc4).

  An image processing unit (not shown) calculates pattern data representing a pattern based on the image data (step Sc5).

  Based on the pattern data, the pattern detection unit J calculates the number of times the predetermined pattern appears at the predetermined position as the rotation number data (step Sc6).

  The vehicle speed calculation unit K calculates speed data representing the assumed speed of the vehicle 4 based on the rotation speed data and the diameter of the tire 3 (step Sc7).

  The abnormal heating determination unit L determines whether or not the tire 3 and the brake are abnormally heated based on the temperature data, and calculates abnormal heating determination data representing the determination result (step Sc8).

  With such a configuration, in the performance test of the vehicle 4, since it is non-contact, it is difficult to break. Further, since the position of the edge is obtained by recognizing the image, it is not necessary to set an accurate sensor arrangement or the like with respect to the vehicle 4, and erroneous detection and detection errors are unlikely to occur, which is preferable for full automation. Furthermore, it is easy to deal with various vehicle types by software, and from this point, it is suitable for full automation. The expandability is high and not only the state of the tire 3 such as the state of burst, lock, abnormal heating, and the degree of slipping can be known, but also it can be used for automating the arrangement of the vehicle to be tested. Further, since the position comparison unit H calculates the length and direction in which the center point of the tire 3 and the center point of the uniaxial drum 2 are separated in the horizontal direction as position comparison data, the position determination unit I performs the performance test. It is also easy to set to capture the vibration of the vehicle 4 inside.

  In addition, if the reference edge data stored in the reference edge data storage unit 8 in step Sb1 to step Sb3 is stored in a pair with the vehicle number, the next time the same vehicle 4 is tested, the data is stored. It can be used, and the operations of Step Sb1 to Step Sb3 can be omitted.

  When the uniaxial drum is warmed up, for example, it is determined whether or not the vehicle is lifted up by determining whether the edge of the tire and the edge of the uniaxial drum are separated by a predetermined amount or more. During vehicle testing, for example, it is possible to perform normal centering by determining whether or not the contact point between the tire edge and the uniaxial drum edge is in a predetermined area near the top of the uniaxial drum. It is possible to determine whether or not the state has been set.

  Second Embodiment

  Next, a second embodiment will be described. In addition, in this figure, the same code | symbol is attached | subjected to the member corresponding to the said embodiment.

  The chassis dynamometer P is the same as in the above embodiment.

  Each part will be described below with reference to FIG.

  The image processing unit 5 calculates tire edge data representing the edge of the tire 3 and pseudo road edge data representing the edge of the pseudo road 2. In the present embodiment, these are the same edge data obtained by performing image processing on image data and extracting edges.

  In this embodiment, the determination unit 6 includes a tire specific point data calculation unit, a pseudo traveling road specific point data calculation unit C, and a determination unit main body A in order to determine a burst.

  The tire specific point data calculation unit B is a tire specific point that is a point that can be specified from the edge of the tire 3 such as the center point of the tire 3 from edge data that is also tire edge data calculated by the image processing unit 5. The tire specific point data indicating the position is calculated. Of course, the tire specific point may be a point on the edge or the like. In such a case, for example, a tire specific point such as a point representing the top of the tire 3 is a tire space that is a boundary between the tire 3 and a portion that does not constitute the tire 3 such as the space under the uniaxial drum 2 or the vehicle 4. It may be a constant point calculated based on tire edge data having an accuracy that allows the boundary to be recognized, regardless of the normal rotation of the tire 3, but of course it moves with the rotation of the tire 3. You may be such a point.

  In the present embodiment, as shown in FIG. 9A, two different points are defined on the lower edge of the tire 3, and the position of the center point of the tire 3 is defined as the intersection of lines perpendicular to the tangent line passing through each point. Calculated as specific tire specific point data.

  The pseudo traveling path specific point data calculation unit C is configured to detect the edge of the pseudo traveling path that is the uniaxial drum 2 such as the center point of the uniaxial drum 2 from the edge data that is also the pseudo traveling path edge data calculated by the image processing unit 5. The pseudo travel path specific point data indicating the position of the pseudo travel path specific point, which is a point that can be identified from, is calculated. Needless to say, the pseudo travel path specifying point may be a point on the edge. In such a case, for example, the pseudo traveling path specific point such as a point representing the top of the uniaxial drum 2 is a boundary between the uniaxial drum 2 and the one not constituting the uniaxial drum 2 such as the space under the tire 3 or the vehicle 4. Although it may be a fixed point that does not depend on the rotation of the uniaxial drum 2, it is calculated based on the pseudo traveling path edge data having such an accuracy that the uniaxial drum space boundary can be recognized. It may be a point that moves with the rotation of 2. Of course, there is no problem even if the image is not picked up, such as the center point of the uniaxial drum 2.

  In the present embodiment, the position of the center point of the uniaxial drum 2 is calculated as the pseudo travel path specific point data in the same manner as the tire specific point.

  Based on the relative position of the tire specific point indicated by the tire specific point data with respect to the pseudo road specific point position indicated by the pseudo road specific point data, the determination unit main body A determines that the tire 3 is abnormal, for example. Whether or not there is a predetermined state, such as whether or not, is determined, and state determination data representing the determination result is calculated. Specifically, for example, if the distance between the pseudo running road specific point and the tire specific point is within a predetermined value, the burst is determined.

  For example, in this embodiment, when the distance between the tire specific point and the pseudo traveling road specific point approaches a predetermined distance or more, it is determined that the burst is occurring.

  Hereinafter, an example of the operation of the vehicle installation state determination device 1 according to the present embodiment will be described using the flowchart of FIG. 10 with reference to FIG.

  A vehicle performance test is started, and each determination and measurement operation in the following procedure is repeated.

  The imaging unit 7 images the side surfaces of the tire 3 and the uniaxial drum 2 and outputs image data (step Sd1).

  The image processing unit 5 calculates edge data representing an edge based on the image data (step Sd2).

  The tire specific point data calculation unit B calculates tire specific point data based on the edge data (step Sd3).

  The pseudo traveling path specific point data calculation unit C calculates pseudo traveling path specific point data based on the edge data (step Sd4).

  The determination unit main body A determines whether the tire 3 is burst based on the relative position of the tire specific point with respect to the pseudo traveling road specific point position, and calculates state determination data representing the determination result ( Step Sd5).

  With such a configuration, since various states including an abnormal state are determined based only on the tire specific point and the pseudo traveling road specific point, the processing can be simplified. Suitable for determining burst status. Further, since the burst determination is performed by grasping the relative positions of the tire 3 and the uniaxial drum 2, the determination can be made without any influence even when the imaging unit 7 is moved during the performance test. Further, as in the first embodiment, various states of the tire 3 are determined and calculated by providing a position comparison unit H, a position determination unit I, a pattern detection unit J, a vehicle speed calculation unit K, an abnormal heating determination unit L, and the like. Furthermore, since it is possible to determine the presence or absence of vibration in the front-rear direction of the vehicle body by providing the front-rear direction position detection unit F and the vibration determination unit G, the multi-function is easy. Suitable for automation.

  For example, when centering a tire on a uniaxial drum, various centering devices are usually used. However, if the present invention is used, it can also be determined whether the tire is accurately centered on the uniaxial drum. . In that case, for example, the tire specific point data calculation unit B calculates the center point of the tire 3, the pseudo traveling road specific point data calculation unit C calculates the center point of the uniaxial drum 2, and the determination unit main body A The length at which the center point of the uniaxial drum 2 and the center point of the uniaxial drum 2 are separated in the horizontal direction is the same as the sum of the radius of the tire 3 calculated from the tire edge data and the radius of the known uniaxial drum 2 Or not.

  Further, for example, when the uniaxial drum is warmed up after the vehicle is placed on the uniaxial drum, the vehicle tire may be separated from the uniaxial drum and then warmed up. In this case, if the tire is in contact with the uniaxial drum, there is a risk that the vehicle will jump out during the warm-up operation. In order to avoid this, it can also be determined whether the tire and the uniaxial drum are completely separated from each other. In that case, for example, the position of the lowermost part of the tire 3 and the top of the drum 2 may be compared for determination.

  <Third Embodiment>

  Next, a third embodiment will be described. In addition, in this figure, the same code | symbol is attached | subjected to the member corresponding to the said embodiment.

  The chassis dynamometer P is the same as in the above embodiment.

  Each part will be described below with reference to FIG.

  In this embodiment, the determination unit 6 includes a tire specific point data calculation unit B, a specific point data storage unit D2, a specific point comparison unit E, and a determination unit main body A in order to determine a burst. A front-rear direction position detection unit F and a vibration determination unit G are provided to determine whether or not the object is vibrating. In addition, the image data output from the two imaging units 7 is set so as to be able to perform processing related to them.

  The specific point data storage unit D2 stores a specific point, and also serves as a reference point data storage unit D that stores reference point data representing coordinates of a point serving as a reference for determination of a tire condition such as a burst. It is.

  In the present embodiment, a plurality of tire specific point data calculation units B calculate based on tire edge data calculated by the image processing unit 5 from image data output from the two imaging units 7 (1) and 7 (2). Stores a pair of tire specific points. By storing the specific point data of a plurality of tires at the time of the vehicle performance test, the tire specific point data regarding the tires that are normal stochastically is stored. Point data may be stored.

  The specific point comparison unit E compares the reference point data with the tire specific point data, and calculates specific point comparison data representing a comparison result.

  In this embodiment, the tire specific point data calculated and stored based on each of the two imaging units 7 (1) and 7 (2) are compared with the corresponding tire specific point data on the left and right sides, and the left and right tires are compared. 3 is detected. As specific point comparison data, a distance between a pair of tire specific points that are most distant from each other is calculated as specific point comparison data.

  The determination unit main body A determines whether the tire 3 is burst based on the specific point comparison data calculated by the specific point comparison unit E, and calculates state determination data representing a determination result.

  In the present embodiment, when the distance indicated by the specific point comparison data is greater than or equal to a predetermined distance, it is determined that a burst.

  The front-rear direction position detection unit F detects the front-rear direction position of the tire 3 based on the tire specific point data calculated by the tire specific point data calculation unit B, and calculates front-rear direction position data representing a detection result. To do.

  The vibration determination unit G determines whether the vehicle 4 is vibrating based on the front-rear direction position data calculated by the front-rear direction position detection unit F, and calculates vibration determination data representing a determination result. is there. A front-rear direction position data storage unit (not shown) is provided, and the front-rear direction position data storage unit stores the position in the front-rear direction of a predetermined tire specific point as history data.

  In the present embodiment, the history data and the position indicated by the front-rear direction position data are compared, and it is determined that the object is vibrating by detecting that a predetermined movement or more appears at a predetermined time interval.

  Hereinafter, an example of the operation of the vehicle installation state determination device 1 according to the present embodiment will be described using the flowchart of FIG. 12 with reference to FIG.

  A vehicle performance test is started, and each determination and measurement operation in the following procedure is repeated.

  The right imaging unit 7 (1) images the side surfaces of the tire 3 and the uniaxial drum 2 and outputs the right image data (step Se1).

  The image processing unit 5 calculates right tire edge data representing an edge based on the image data (step Se2).

  The tire specific point data calculation unit B calculates the right tire specific point data based on the tire edge data and stores it in the specific point data storage unit D2 (step Se3).

  The left imaging unit 7 (2) images the side surfaces of the tire 3 and the uniaxial drum 2 and outputs the left image data (step Se4).

  The image processing unit 5 calculates left tire edge data representing an edge based on the image data (step Se5).

  The tire specific point data calculation unit B calculates the left tire specific point data based on the tire edge data and stores it in the specific point data storage unit D2 (step Se6).

  Based on the specific point data stored in the specific point data storage unit D2, the specific point comparison unit E obtains a distance indicating the positional deviation between the corresponding tire specific points on the left and right, and compares the maximum distance with the specific point comparison Calculated as data (step Se7).

  The determination unit main body A performs burst determination based on whether or not the distance indicated by the specific point comparison data is greater than or equal to a predetermined value, and calculates state determination data representing the determination result (step Se8).

  The front-rear direction position detection unit F detects the front-rear direction position of a predetermined tire specific point, and calculates front-rear direction position data representing the detection result (step Se9).

  The vibration determination unit G determines that the vibration is generated by detecting that a predetermined movement or more has appeared based on the longitudinal position data at predetermined time intervals (step Se10).

  With such a configuration, since the tire specific points of the left and right tires 3 are compared, even when the tire 3 is burst before the start of the performance test, the burst determination can be performed correctly. In addition, the tire specific point comparison data used for burst determination in this embodiment can not only have a smaller data amount than the comparison data used in the first embodiment, but also compare the position of the points. Therefore, the process of the determination unit main body A can be simplified. For example, since the difference between the left and right of the vehicle can be detected, it can be used as an abnormal device for detecting an unexpected abnormality or the like, and is suitable for full automation.

  The present invention is not limited to the above embodiment.

  Each edge data may be any data indicating the position of the edge, such as coordinate data or data representing a graphic, and is not limited to data representing an image.

  In addition, as a method for determining the center point of the tire, there is a method in which two strings are determined from arbitrary three points on the edge of the tire and defined as an intersection of straight lines orthogonal to the strings. It is also possible to calculate the center point using a large number of points, detect the deformation of the tire edge because the center point position does not fall within the predetermined range, and determine whether it is bursting or not It is.

  In addition, when performing a performance test of a 4WD vehicle, a chassis dynamo equipped with two pseudo driving paths will be used. In this case, the tire interval between the front wheels and the rear wheels differs depending on the vehicle type. For example, when the pseudo traveling path is a uniaxial drum, the position needs to be adjusted. In such a case, if the pseudo traveling path is movable and the imaging unit is provided with a fixed relative position to the pseudo traveling path, the position of the imaging unit is always set on the side of the pseudo traveling path. There is no need to adjust it so that it is caught in front.

  In addition, the determination unit can perform more complicated determination based on various specific points of each tire derived from each image data output from a plurality of imaging units, and can also determine a plurality of various data and conditions. It is possible to make a determination based on a combination, a determination of a complex vehicle state, and the like. For example, it is naturally conceivable that the reference edge data indicates the edge of the tire and the edge of the pseudo road, or the reference point data indicates the tire specific point and the pseudo road specific point. If it is such, it is a suitable structure for judging both the state of arrangement | positioning and a shape of a tire. In addition, as a method for determining the predetermined condition, the tire edge is compared with data representing a point determined from the edge of a normal tire, the tire edge is compared with a pseudo road specific point, or the tire specific point is compared with a normal tire. Of course, a method of comparing the edge with the point, such as comparing the edge with the edge of the tire, or comparing the tire specific point with the pseudo road edge, is conceivable. If this is the case, it is easier to compare than comparing edges, and more flexible comparison than comparing points is possible. It is also possible to make the part simple. In addition to the tire infrared thermometer, it is also possible to determine the state in association with a separately provided sensor. If it is such, it will become possible to determine more states of more vehicles, for example. Further, the determination unit is not limited to indicating whether or not the determination result is in a predetermined state. For example, the determination unit outputs a stepwise determination result according to the degree of risk or possibility of the state, the reliability with respect to the determination accuracy, or the like. Such a configuration is also conceivable. In such a case, for example, based on a plurality of stepwise determination results, the determination unit uses a heuristic, a neuro system, etc., and a fully automatic system that performs advanced determination such as detecting a precursor of an abnormal state It is also possible to do. Furthermore, by making the determination unit perform the determination based on the vehicle data, it is possible to flexibly deal with various vehicles and to provide full automation.

  Also, three-dimensional edge data obtained by capturing a tire as a three-dimensional solid from a plurality of image data captured from different angles using a plurality of imaging units, and a normal tire obtained by imaging or modeling, for example It is also possible to determine the condition of the tire by comparing the 3D CAD data representing the value, the 3D figure obtained by the deformation thereof, or all or part of the data representing the edge of the cylinder, etc., and know the installation state of the vehicle. In this way, it becomes possible to more accurately determine the state of the vehicle.

  A part or all of the above-described components may be appropriately combined. Various other modifications are possible without departing from the spirit of the present invention.

The layout which showed an example of the arrangement | positioning state of each apparatus at the time of performing a vehicle performance test using the vehicle installation state determination apparatus which concerns on this invention, and a chassis dynamo. The 1st functional block diagram which shows the functional structure of the vehicle installation state determination apparatus in 1st Embodiment. The hardware block diagram which shows the hardware constitutions of the image process part and determination part of the vehicle installation state determination apparatus in 1st-3rd embodiment. The edge comparison part operation | movement explanatory drawing explaining operation | movement of the edge comparison part in 1st Embodiment. The 1st flowchart which shows an example of the operation | movement in the embodiment. The 2nd flowchart which shows an example of the operation | movement in the embodiment. The 3rd flowchart which shows an example of the operation | movement in the embodiment. 2nd functional block diagram which shows the function structure of the vehicle installation state determination apparatus in 2nd Embodiment. Tire specific point data calculation part operation explanatory drawing explaining operation | movement of the tire specific point data calculation part in 2nd and 3rd embodiment. The 4th flowchart which shows an example of the operation | movement in 2nd Embodiment. The 3rd functional block diagram which shows the functional structure of the vehicle installation state determination apparatus in the 3rd Embodiment of this invention. The 5th flowchart which shows an example of the operation | movement in 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle installation state determination apparatus 2 ... Pseudo traveling road 3 ... Tire 4 ... Vehicle 5 ... Image processing part 6 ... Determination part 7 ... Imaging part 8 ... Reference | standard edge and data storage part 9 ... Edge comparison part A ... Determination part main body B ... tire specific point data calculation part C ... pseudo driving road specific point data calculation part D ... reference point data storage part E ... specific point comparison part F ... longitudinal direction position detection part G ... vibration determination part H ... position comparison part I ... position Determination unit J ... Pattern detection unit K ... Vehicle speed calculation unit L ... Abnormal heating determination unit

Claims (16)

It is used together with a vehicle testing apparatus for performing a performance test by rotating a tire of a vehicle installed on a pseudo traveling road such as a drum or a belt,
An image processing unit that processes image data obtained by imaging the side surface of the tire and calculates tire edge data representing an edge of the tire;
A determination unit that determines whether the tire state satisfies a predetermined condition based on the tire edge data calculated by the image processing unit, and calculates state determination data representing a determination result; A vehicle installation state determination device characterized by being a thing. A reference edge data storage unit storing reference edge data representing an edge serving as a reference for determining the state of the tire;
An edge comparison unit that compares the reference edge data and the tire edge data and calculates edge comparison data representing a comparison result;
A determination unit body that determines whether or not the state of the tire satisfies a predetermined condition based on edge comparison data calculated by the edge comparison unit, and calculates state determination data representing a determination result; The vehicle installation state determination device according to claim 1, wherein The vehicle installation according to claim 2, wherein the reference edge data stored in the reference edge data storage unit represents a circle or an arc when the edge of the tire is assumed to be a circle. State determination device. The vehicle installation state determination apparatus according to claim 2, wherein the reference edge data stored in the reference edge data storage unit is obtained by imaging a normal tire. The edge comparison unit calculates, as edge comparison data, a difference between an area created by the edge represented by the reference edge data and an area created by the edge represented by the tire edge data. The vehicle installation state determination device according to any one of claims 3 to 4. The image processing unit processes image data obtained by imaging the side surface of the pseudo traveling road, and calculates pseudo traveling road edge data representing an edge of the pseudo traveling road,
3. The vehicle installation state determination device according to claim 2, wherein the reference edge data stored in the reference edge data storage unit is the pseudo running road edge data. A tire specific point data calculating unit that calculates tire specific point data indicating a position such as a center point of a tire based on the tire edge data;
A determination unit main body that determines whether or not the state of the tire satisfies a predetermined condition based on a position of the tire specific point indicated by the tire specific point data, and calculates state determination data representing a determination result; The vehicle installation state determination device according to claim 1, wherein the vehicle installation state determination device is a device. A reference point data storage unit that stores reference point data representing coordinates of a point serving as a reference for determining the state of the tire;
A specific point comparison unit that compares the reference point data with the tire specific point data and calculates specific point comparison data representing a comparison result;
A determination unit main body that determines whether or not the state of the tire satisfies a predetermined condition based on the specific point comparison data calculated by the specific point comparison unit, and calculates state determination data representing a determination result; The vehicle installation state determination device according to claim 7, wherein the vehicle installation state determination device is a device. 9. The vehicle installation state determination device according to claim 8, wherein the reference point data stored in the reference point data storage unit is obtained by imaging a normal tire. The image processing unit processes image data obtained by imaging the side surface of the pseudo traveling road, and calculates pseudo traveling road edge data representing an edge of the pseudo traveling road,
The determination unit indicates a position of a pseudo traveling path specific point that is a point that can be identified from an edge of the pseudo traveling path such as a center point of the pseudo traveling path from the pseudo traveling path edge data calculated by the image processing unit. A pseudo driving path specific point data calculating unit for calculating pseudo driving path specific point data;
9. The vehicle according to claim 8, wherein the reference point data stored in the reference point data storage unit is the pseudo traveling path specific point data calculated by the pseudo traveling path specific point data calculating unit. Installation state determination device. Front / rear direction position detection in which the determination unit detects a position in the front / rear direction of the tire based on the tire specific point data calculated by the tire specific point data calculation unit, and calculates front / rear direction position data representing a detection result And
A vibration determination unit that determines whether or not the vehicle vibrates based on the front-rear direction position data calculated by the front-rear direction position detection unit and calculates vibration determination data that represents a determination result. The vehicle installation state determination device according to any one of claims 7 to 10, wherein It includes an imaging unit that images the side surface of the tire and the side surface of the pseudo traveling road, and outputs image data representing the captured image.
The pseudo driving path is movable;
The vehicle installation state determination device according to any one of claims 1 to 11, wherein the imaging unit includes a fixed relative position with respect to the pseudo traveling road. The imaging unit images the side surface of the tire and the side surface of the pseudo traveling road, and outputs image data representing the captured image.
A position comparison unit that compares the position of the tire determined by the tire edge data output from the image processing unit with the position of the pseudo traveling road and calculates position comparison data representing a comparison result. When,
A position determination unit that determines whether or not the tire is on a pseudo traveling road based on the position comparison data calculated by the position comparison unit, and calculates position determination data that represents a determination result; The vehicle installation state determination device according to any one of claims 1 to 12, characterized in that The determination unit includes a tire specific point data calculation unit that calculates tire specific point data indicating a position such as a center point of a tire based on the tire edge data,
The rotation speed data calculation part which calculates the rotation speed data which concerns on the rotation speed of the tire based on the position of the tire specific point which the tire specific point data shows is characterized by the above-mentioned. The vehicle installation state determination apparatus in any one of thru | or 13. The image processing unit processes image data obtained by imaging the side surface of the tire, and calculates pattern data representing a predetermined pattern provided on the tire side surface,
The determination unit calculates a rotation speed data related to the rotation speed of the tire based on the pattern data; and
The vehicle speed calculation unit for calculating speed data representing an assumed speed of the vehicle from the rotation speed data calculated by the pattern detection unit and the diameter of the tire. The vehicle installation state determination device according to any one of 1 to 14. It includes an imaging unit that images the side surface of the tire and outputs image data representing the captured image.
Further, the imaging unit includes an imaging unit including an infrared thermometer that measures the temperature at a predetermined position of the tire and outputs temperature data representing a measurement result,
The determination unit includes an abnormal heating determination unit that determines abnormal heating of tires and / or brakes based on temperature data output from the non-contact thermometer, and calculates abnormal heating determination data representing a determination result. The vehicle installation state determination device according to claim 1, wherein the vehicle installation state determination device is a vehicle installation state determination device.