CN112595207B - Non-contact type rapid measuring device and method for width of bicycle tire - Google Patents
Non-contact type rapid measuring device and method for width of bicycle tire Download PDFInfo
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- CN112595207B CN112595207B CN202011447896.XA CN202011447896A CN112595207B CN 112595207 B CN112595207 B CN 112595207B CN 202011447896 A CN202011447896 A CN 202011447896A CN 112595207 B CN112595207 B CN 112595207B
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- G01—MEASURING; TESTING
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- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/04—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B5/046—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring width
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Abstract
The invention discloses a non-contact type rapid measuring device and a non-contact type rapid measuring method for the width of a bicycle tire, wherein the non-contact type rapid measuring device comprises the following steps: the structure shell, laser range finder group and main control system, laser range finder group is used for measuring distance information data to and feed back trigger signal to the main control system. The invention has the advantages that: the realization is simple, installs in the entry both sides in bicycle special lane, and the front and back tire width of vehicles such as bicycle, electric motor car, motorcycle, scooter in the measurable quantity passes through its passageway to send measuring result to the main control system for the judgement, be used for the guarantee bicycle in the city for the right of way of the special travelling lane of bicycle that green trip set up, avoid non-bicycle to occupy the special travelling lane of bicycle, provide the solution for the city trip of low carbon environmental protection. The invention is characterized in that the width of the tire of the bicycle can be measured when the bicycle is ridden quickly, the bicycle does not need to be stopped and pushed, and the vehicle can deviate from the center line in the lane without being influenced by deviation.
Description
Technical Field
The invention relates to a non-contact type rapid measuring device and method for the width of a bicycle tire.
Background
In order to relieve the short-distance commuting trip in cities, a plurality of cities begin to plan bicycle special lanes, and the bicycle is promoted to trip through the construction of the bicycle special lanes, which is a more green and environment-friendly traffic mode, so that more traffic options are provided for the sustainable development of the cities and the healthy life of citizens. Still use the car trip to construct as main lane because of urban ground traffic, some bicycle lanes are occupied by roadside parking stall, express delivery tricycle electric motor car and two-wheeled electric bicycle gradually in actual life for the current occupation ratio of bicycle reduces gradually. With the prevalence of a 2km traffic solution of a shared bicycle terminal, the special bicycle lane can ensure that riders ride more safely, reduce the risk of traffic accidents and create a more friendly riding environment. However, the bicycle lane can be occupied by non-bicycles, so that the intelligent bicycle identification gate system is installed at the entrance and the exit of the bicycle lane in some cities to guarantee the right of way of the bicycles.
In order to quickly identify vehicles such as bicycles, electric vehicles, motorcycles and the like, multi-dimensional geometric quantity information of the vehicles passing through an identification gate system channel needs to be collected, wherein the width of a tire is one of typical differences of the vehicles.
Disclosure of Invention
The invention aims to provide a device and a method for quickly measuring the width of a bicycle tire in a non-contact way, which solve the problem of quickly measuring the width of the tire passing through a vehicle in the non-contact way.
In view of this, the present invention provides a bicycle tire width non-contact type rapid measuring device, which is characterized in that: the device comprises a structural shell, a laser range finder group and a control host;
the structure shell is used for providing a structure installation position and a determined distance measurement geometric quantity initial value for the laser distance measuring instrument group and the control host, and comprises: the vehicle passing identification device comprises a right shell and a left shell, wherein a region between the right shell and the left shell is a vehicle passing identification region;
the laser range finder group is arranged at the bottom of the structural shell, is close to the ground and has a certain height from the ground by a laser beam, is used for measuring distance information data and feeding back a trigger signal to the control host, and at least comprises a first group of laser range finders used for measuring a measuring point which a vehicle passes through firstly and a second group of laser range finders used for measuring a measuring point which the vehicle passes through later, wherein a certain distance exists between the first group of laser range finders and the second group of laser range finders in the vehicle passing direction, and the heights of the laser beams are kept consistent;
the control host is installed in the structure shell and is in communication connection with the laser range finder group, laser beams of the laser range finder group are blocked by passing vehicle wheels and then trigger signals are sent to the control host by the laser range finder, and when a bicycle passes through a vehicle identification area, the number of front wheels, rear wheels and vehicles of the vehicle is judged according to the trigger sequence and times.
Further, still include: the calibration plate is placed in the vacant space in the structural shell and used for being taken out and calibrated when calibration is needed.
Further, the laser rangefinder set includes: a first right laser range finder, a second right laser range finder, a first left laser range finder, a second left laser range finder, wherein,
the first right laser range finder and the second right laser range finder are arranged at the bottom of the right shell;
the first left laser range finder and the second left laser range finder are arranged at the bottom of the left shell;
the first right laser range finder and the first left laser range finder are installed in a centrosymmetric mirror manner;
and the second right laser range finder and the second left laser range finder are arranged in a centrosymmetric mirror manner.
Furthermore, the first right laser range finder and the first left laser range finder form a first measuring point, and the first measuring point is located in front of the length center line.
Furthermore, the second right laser range finder and the second left laser range finder form a second measuring point, and the second measuring point is located behind the length center line.
Another object of the present invention is to provide a method for non-contact rapid measurement of a width of a bicycle tire, comprising:
firstly, providing a structural shell, a laser range finder group and a control host; the structural shell includes: the vehicle passing identification device comprises a right shell and a left shell, wherein a region between the right shell and the left shell is a vehicle passing identification region; the laser range finder group is arranged at the bottom of the structural shell, is close to the ground and has a certain height from the ground by a laser beam, and at least comprises a first group of laser range finders used for measuring a measuring point which is passed by a vehicle firstly and a second group of laser range finders used for measuring a measuring point which is passed by the vehicle later, wherein a certain distance exists between the first group of laser range finders and the second group of laser range finders in the passing direction of the vehicle, the heights of the laser beams are kept consistent, and the control host is arranged in the structural shell and is in communication connection with the laser range finder group;
then, when the bicycle passes through the vehicle identification area, the laser range finder set starts to measure distance information data, and laser beams of the laser range finder set are blocked by passing vehicle wheels and then are sent to the control host by the laser range finder;
and finally, the control host receives the fed back trigger signals and judges the number of the front wheels, the rear wheels and the vehicles of the vehicle according to the trigger sequence and the number of times.
Further, the laser rangefinder set includes: a first right laser range finder, a second right laser range finder, a first left laser range finder, a second left laser range finder, wherein,
the first right laser range finder and the second right laser range finder are arranged at the bottom of the right shell;
the first left laser range finder and the second left laser range finder are arranged at the bottom of the left shell;
the first right laser range finder and the first left laser range finder are installed in a centrosymmetric mirror manner;
the second right laser range finder and the second left laser range finder are arranged in a centrosymmetric mirror manner;
the first right laser range finder, the first left laser range finder and the second right laser range finder are arranged on the vehicle body, the second left laser range finder keeps continuously measuring in a vehicle-free passing state, and laser beams keep irradiating on the surfaces of the structural shells opposite to each other.
Further, the first right laser distance meter continuously collects distance information R1 between the laser emitting end surface of the first right laser distance meter and the tire wall on the right side of the wheel after the wheel passes through the triggering;
the first left laser distance meter is triggered later than the first right laser distance meter, and the distance information L1 between the laser emission end surface of the wheel and the tire wall on the left side of the wheel is continuously collected after the wheel passes through the triggering;
the collected R1 and L1 are a set of values, starting from the moment the wheel cuts off the laser beam, until the wheel exits the laser beam area, the beam returns to the 1R and 1L values and is cut off.
Further, still include: and carrying out calibration measurement by adopting a calibration plate, wherein the calibration plate is placed in the vacant space in the structural shell.
Further, a calibration measurement is performed using a calibration plate, comprising:
the first right laser range finder continuously acquires distance information R1 between the laser emission end surface of the first right laser range finder and the right tire wall of the wheel after the wheel passes triggering;
the first left laser distance measuring instrument is triggered later than the first right laser distance measuring instrument, and the distance information between the laser emitting end face of the wheel and the tire wall on the left side of the wheel is continuously collected after the wheel is triggered.
And according to the collected R1 and L1, the calibration initial value is adopted, and the light beam is restored to the 1R and 1L values and is cut off from the moment when the wheel cuts off the laser beam until the wheel exits the laser beam area.
The invention achieves the following significant beneficial effects:
the realization is simple, include: the laser range finder set comprises a structural shell, a laser range finder set and a control host; the structure shell is used for providing a structure installation position and a determined distance measurement geometric quantity initial value for the laser distance measuring instrument group and the control host, and comprises: the vehicle passing identification device comprises a right shell and a left shell, wherein a region between the right shell and the left shell is a vehicle passing identification region; the laser range finder group is arranged at the bottom of the structural shell, is close to the ground and has a certain height from the ground by a laser beam, is used for measuring distance information data and feeding back a trigger signal to the control host, and at least comprises a first group of laser range finders used for measuring a measuring point which a vehicle passes through firstly and a second group of laser range finders used for measuring a measuring point which the vehicle passes through later, wherein a certain distance exists between the first group of laser range finders and the second group of laser range finders in the vehicle passing direction, and the heights of the laser beams are kept consistent; the control host is installed in the structure shell and is in communication connection with the laser range finder group, laser beams of the laser range finder group are blocked by passing vehicle wheels and then trigger signals are sent to the control host by the laser range finder, and when a bicycle passes through a vehicle identification area, the number of front wheels, rear wheels and vehicles of the vehicle is judged according to the trigger sequence and times. The invention can measure the widths of front and rear tires of bicycles, electric vehicles, motorcycles, scooters and other vehicles passing through the channels of the device and send the measurement results to the control host for judgment. The width of the tires of a vehicle, such as a bicycle, passing therebetween can be measured while riding fast, without stopping and pushing, and the vehicle can deviate from the center line within the lane, without being affected by the amount of deviation.
Drawings
Fig. 1 is a schematic structural view of a non-contact type rapid measuring device for the width of a bicycle tire of the present invention.
FIG. 2 is a schematic view of the non-contact type fast measuring device for measuring the width of a bicycle tire according to the present invention.
FIG. 3 is a schematic front wheel track of the vehicle of the present invention.
FIG. 4 is a schematic view of an embodiment of the vehicle front wheel track of the present invention.
Fig. 5 is a diagram of a ranging calibration embodiment of the present invention.
Detailed Description
The advantages and features of the present invention will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings and detailed description of specific embodiments of the invention. It is to be noted that the drawings are in a very simplified form and are not to scale, which is intended merely for convenience and clarity in describing embodiments of the invention.
It should be noted that, for clarity of description of the present invention, various embodiments are specifically described to further illustrate different implementations of the present invention, wherein the embodiments are illustrative and not exhaustive. In addition, for simplicity of description, the contents mentioned in the previous embodiments are often omitted in the following embodiments, and therefore, the contents not mentioned in the following embodiments may be referred to the previous embodiments accordingly.
While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood that the inventors do not intend to limit the invention to the particular embodiments described, but intend to protect all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the claims. The same meta-module part number may be used throughout the drawings to represent the same or similar parts.
Referring to fig. 1 to 5, the present invention provides a non-contact type fast measuring device for bicycle tire width, comprising: the laser range finder set comprises a structural shell, a laser range finder set and a control host;
the structure shell is used for providing a structure installation position and a determined distance measurement geometric quantity initial value for the laser distance measuring instrument group and the control host, and comprises: the vehicle passing identification device comprises a right shell and a left shell, wherein a region between the right shell and the left shell is a vehicle passing identification region;
the laser range finder group is arranged at the bottom of the structural shell, is close to the ground and has a certain height from the ground by a laser beam, is used for measuring distance information data and feeding back a trigger signal to the control host, and at least comprises a first group of laser range finders used for measuring a measuring point which a vehicle passes through firstly and a second group of laser range finders used for measuring a measuring point which the vehicle passes through later, wherein a certain distance exists between the first group of laser range finders and the second group of laser range finders in the vehicle passing direction, and the heights of the laser beams are kept consistent;
the control host is installed in the structure shell and is in communication connection with the laser range finder group, laser beams of the laser range finder group are blocked by passing vehicle wheels and then trigger signals are sent to the control host by the laser range finder, and when a bicycle passes through a vehicle identification area, the number of front wheels, rear wheels and vehicles of the vehicle is judged according to the trigger sequence and times.
In one embodiment, further comprising: the calibration plate is placed in the vacant space in the structural shell and used for being taken out and calibrated when calibration is needed.
In one embodiment, the set of laser rangefinders comprises: a first right laser range finder, a second right laser range finder, a first left laser range finder, a second left laser range finder, wherein,
the first right laser range finder and the second right laser range finder are arranged at the bottom of the right shell;
the first left laser range finder and the second left laser range finder are arranged at the bottom of the left shell;
the first right laser range finder and the first left laser range finder are installed in a centrosymmetric mirror manner;
and the second right laser range finder and the second left laser range finder are arranged in a centrosymmetric mirror manner.
In one embodiment, the first right laser range finder and the first left laser range finder constitute a first measurement point, the first measurement point being located before the length centerline.
In one embodiment, the second right laser range finder and the second left laser range finder constitute a second measurement point, the second measurement point being located behind the length centerline.
Another object of the present invention is to provide a method for non-contact rapid measurement of a width of a bicycle tire, comprising:
firstly, providing a structural shell, a laser range finder group and a control host; the structural shell includes: the vehicle passing identification device comprises a right shell and a left shell, wherein a region between the right shell and the left shell is a vehicle passing identification region; the laser range finder group is arranged at the bottom of the structural shell, is close to the ground and has a certain height from the ground by a laser beam, and at least comprises a first group of laser range finders used for measuring a measuring point which is passed by a vehicle firstly and a second group of laser range finders used for measuring a measuring point which is passed by the vehicle later, wherein a certain distance exists between the first group of laser range finders and the second group of laser range finders in the passing direction of the vehicle, the heights of the laser beams are kept consistent, and the control host is arranged in the structural shell and is in communication connection with the laser range finder group;
then, when the bicycle passes through the vehicle identification area, the laser range finder set starts to measure distance information data, and laser beams of the laser range finder set are blocked by passing vehicle wheels and then are sent to the control host by the laser range finder;
and finally, the control host receives the fed back trigger signals and judges the number of the front wheels, the rear wheels and the vehicles of the vehicle according to the trigger sequence and the number of times.
In one embodiment, the set of laser rangefinders comprises: a first right laser range finder, a second right laser range finder, a first left laser range finder, a second left laser range finder, wherein,
the first right laser range finder and the second right laser range finder are arranged at the bottom of the right shell;
the first left laser range finder and the second left laser range finder are arranged at the bottom of the left shell;
the first right laser range finder and the first left laser range finder are installed in a centrosymmetric mirror manner;
the second right laser range finder and the second left laser range finder are arranged in a centrosymmetric mirror manner;
the first right laser range finder, the first left laser range finder and the second right laser range finder are arranged on the vehicle body, the second left laser range finder keeps continuously measuring in a vehicle-free passing state, and laser beams keep irradiating on the surfaces of the structural shells opposite to each other.
In one embodiment, the first right laser distance meter continuously collects distance information R1 from the laser emitting end surface of the first right laser distance meter to the right tire sidewall of the wheel after the wheel passes through the triggering;
the first left laser distance meter is triggered later than the first right laser distance meter, and the distance information L1 between the laser emission end surface of the wheel and the tire wall on the left side of the wheel is continuously collected after the wheel passes through the triggering;
the collected R1 and L1 are a set of values, starting from the moment the wheel cuts off the laser beam, until the wheel exits the laser beam area, the beam returns to the 1R and 1L values and is cut off.
In one embodiment, further comprising: and carrying out calibration measurement by adopting a calibration plate, wherein the calibration plate is placed in the vacant space in the structural shell.
In one embodiment, a calibration measurement is performed using a calibration plate, comprising:
the first right laser range finder continuously acquires distance information R1 between the laser emission end surface of the first right laser range finder and the right tire wall of the wheel after the wheel passes triggering;
the first left laser distance measuring instrument is triggered later than the first right laser distance measuring instrument, and the distance information between the laser emitting end face of the wheel and the tire wall on the left side of the wheel is continuously collected after the wheel is triggered.
And according to the collected R1 and L1, the calibration initial value is adopted, and the light beam is restored to the 1R and 1L values and is cut off from the moment when the wheel cuts off the laser beam until the wheel exits the laser beam area.
As a specific embodiment, the invention comprises a structural shell 1, a laser range finder group 2, a control host 3 and a calibration board 4. The structural shell 1 comprises a right shell 11 and a left shell 12. The area between the right housing 11 and the left housing 12 is a vehicle passage identification area 13. The center line of the identification area 13 in the vehicle passing direction is a passing center line 14 of the identification area 13. The straight line in the identification area 13 perpendicular to the traffic centerline 14 and located at the geometric center of the structural shell 1 is the length centerline 15. the width of the identification area 13 is typically 600mm to 1000 mm.
As a specific embodiment, the laser distance measuring instrument set 2 includes a first right laser distance measuring instrument 21, a second right laser distance measuring instrument 22, a first left laser distance measuring instrument 23, and a second left laser distance measuring instrument 24.
As a specific embodiment, the first right laser distance meter 21 and the second right laser distance meter 22 are installed at the bottom of the right casing 11, and the height of the laser beam from the ground is between 10mm and 26 mm.
As a specific embodiment, the first left laser distance meter 23 and the second left laser distance meter 24 are installed at the bottom of the left casing 12, and the height of the laser beam from the ground is between 10mm and 26 mm.
As a specific embodiment, the first right laser distance meter 21 and the first left laser distance meter 23 are installed in a central symmetry type mirror image mode, a certain distance exists in the vehicle passing direction, and the laser beam height is kept consistent.
As a specific example, the first right laser distance meter 21 and the first left laser distance meter 23 constitute a first measurement point, and the first measurement point is located before the length center line 15, i.e., a measurement point through which the vehicle passes first.
As a specific embodiment, the second right laser distance meter 22 and the second left laser distance meter 24 are installed in a centrosymmetric mirror manner, and have a certain distance in the vehicle passing direction, and the laser beam heights are kept consistent.
As a specific example, the second right laser range finder 22 and the second left laser range finder 24 constitute a second measurement point, which is located behind the length centerline 15, i.e., a measurement point through which the vehicle passes behind.
As a specific embodiment, the laser distance measuring device also has a trigger signal, and the trigger signal is fed back to the control host 3 in addition to measuring the distance information data.
As a specific example, when a vehicle such as a bicycle passes through the vehicle recognition zone 13, it will pass through the first right laser rangefinder 21, the first left laser rangefinder 22, the second right laser rangefinder 23, and the left laser rangefinder 24 in sequence. According to the triggering sequence and the triggering times, the control host machine 3 can judge the front wheels and the rear wheels of the vehicle and the number of the vehicles.
As a specific embodiment, the control host 3 is installed inside the structural shell 1 and is in communication connection with the laser range finder set 2.
As a specific example, the calibration plate 4 is a flat plate with a fixed thickness, the longitudinal dimension of which is greater than the interval of the laser beams between the first right laser distance meter 21 and the second right laser distance meter 23, and the thickness of which is D.
As a specific example, the calibration plate 4 can be placed in the empty space in the structural shell 1, and taken out and calibrated when calibration is needed.
As a specific example, the first right laser distance meter 21, the first left laser distance meter 22, the second right laser distance meter 23, and the second left laser distance meter 24 keep measuring continuously in the no-vehicle passing state, the laser beam keeps irradiating on the respective opposite structural shell surfaces, and the initial measurement values can be respectively recorded as 1R, 1L, 2R, and 2L.
As a specific embodiment, after the structural shells 1 on both sides of the bicycle channel are installed, the installation angle of the laser range finder can be adjusted according to the 4 measured values, or the installation position of the structural shell 1 can be adjusted, so that the values of 1R, 1L, 2R and 2L are as consistent as possible.
As a specific example, theoretically, the measured values of 1R, 1L, 2R, and 2L may be adjusted to be consistent in the mm level, but in practice, they cannot be consistent in the mm level due to installation errors, vehicle impact on the housing, and civil engineering flatness. Because each laser range finder is independent each other, its measured value is inconsistent to the quick measurement influence of tire width lower.
As a specific example, the laser range finder sends a trigger signal to the control host 3 after the laser beam of the laser range finder is blocked by the passing vehicle wheel.
As a specific example, the first right laser distance meter 21 continuously collects the distance information R1 between the laser emitting end surface of the wheel and the right sidewall of the wheel after the wheel passes through and is triggered.
As a specific example, the first left laser distance meter 22 is triggered later than the first right laser distance meter 21, and the distance information L1 between the laser emitting end surface of the wheel and the left sidewall of the wheel is collected continuously after the wheel passes through the triggered first left laser distance meter.
As a specific example, the collected R1 and L1 are not individual values, but are a set of values, and the set of values is from the moment the wheel cuts off the laser beam to the moment the wheel exits the laser beam area, and the beam returns to the 1R and 1L values to be cut off.
As a particular example, the side walls of the wheel section have a certain curvature and the wheel has a certain deformation at the ground under pressure, so that the measured value of the wheel width deviates greatly from the value of the width measured by contact geometry measurement of the tyre side wall at the very beginning of the cutting of the beam and at the very end of the cutting of the wheel.
As a specific example, when the wheel passes through the laser ranging interval, the wheel passes through a certain distance in the speed direction, so that the middle section value in the measured R1 and L1 arrays is close to the tire width value measured in a contact manner after calculation, the middle section value is taken as an effective value, and the sampling threshold value can be set in the control host machine 3 for control.
As a specific example, a value group of 1R-R1-L1 and a value group of 1L-1R-R1 are calculated within a sampling threshold interval, and then the average value is calculated as the width B1 of the front wheels of the vehicle.
As a specific example, the axis of the front wheel does not necessarily have to be parallel to the laser beam as the vehicle passes, i.e. the direction of travel of the vehicle is at an angle to the theoretical centre line of the structural shell 1. Therefore, B1 measured at only one measuring point may be larger than the width of the actual tire due to the included angle, so that it is necessary to add another measuring point, i.e. the measuring position of the second right laser distance meter 23 and the second left laser distance meter 24, in the passing identification area.
As a specific example, the numerical value group 2R-R2-L2 and the numerical value group 2L-R2-L2 when the wheel passes the sampling point 2 are calculated, and the average value is calculated as the width B2 of the front wheel of the vehicle in the same numerical sampling and calculation manner as that adopted for the measurement position 1.
As a specific example, in comparison with B1 and B2, since the value when the angle between the forward direction of vehicle traffic and the theoretical center is zero is the smallest, min (B1, B2) can be used as the non-contact measurement value of the tire width of the front wheel.
As a specific example, since the wheel width actually has the minimum value and the maximum value, when the vehicle travels through the measurement area, the measurement result is abnormal due to an abnormal cause such as a driver lifting the wheel or a middle collision, and therefore, a legal measurement value section is set in the calculation. Such as will
As a specific example, similarly, the same measurement manner is adopted for the rear wheel measurement of the vehicle, and min (B1B, B2B) is taken as the tire width non-contact measurement value of the rear wheel.
As a specific embodiment, when the vehicle passes through the measuring device in the riding process, only the front wheel and the rear wheel are located in the measuring area, and the numerical values which are sequentially collected and are in a reasonable range are width values of the front wheel and the rear wheel of the vehicle.
As a specific embodiment, the front wheel and the rear wheel of the same bicycle are generally made of tires with the same specification because the front wheel and the rear wheel are both provided with included angles with a center line during the passing of the bicycle, the rear wheel is slightly wider than the front wheel in theory because the rear wheel is close to the mass center of a rider, and the included angle generated when the rear wheel passes is generally smaller than that of the front wheel because the rear wheel is not provided with a steering mechanism.
As a specific example, min { min (B1, B2), min (B1B, B2B) } may be used as a non-contact measurement value of the wheel width for further criteria for vehicle identification.
The measuring mode is compatible with various positions of the bicycle in passing, and the bicycle can be measured as long as the wheel is positioned in the identification measuring area, and does not need to travel along a certain track strictly.
As a specific example, the measurement can be carried out when the vehicle passes by pushing, the feet of a rider of the vehicle can be positioned at the measuring point position when the vehicle passes by pushing, but the shoe width and the sampling number are greatly different from the general values of the wheels and are positioned outside the threshold value, and the measurement of the tire width is not influenced.
As a specific example, the first right and left laser range finders 21, 22 around the first measurement point are calibrated using the calibration plate 4 before the noncontact tire measurement is performed.
As a specific example, the laser distance measurement is affected by factors such as strong light and surface characteristics of the reflector, and the adjustment amount of the laser distance meter during installation is limited, which causes the amount of deviation of the values 1R, 1L, 2R, and 2L to be large, in this case, the initial width value may be determined as a fixed value by using a calibration method, for example, the calibrated fixed value at the first measurement point is W1, and the calibrated fixed value at the second measurement point is W2.
As a specific example, in addition, the recognition hosts of the intelligent bicycle recognition system are placed on two sides of a bicycle lane, and may occasionally be hit by a bicycle, an electric vehicle, or other vehicles in actual use, so that the measured values of 1R, 1L, 2R, 2L, or the like may change, in which case, using a calibration method to calibrate the initial width value at the measurement point to W may facilitate rapid width measurement.
As a specific example, the calibration is carried out by placing the calibration board 4 at any position in the first measuring point, and the control host is used to measure the distance R1c from the right side of the calibration board 4 to the laser emission position by using the first right laser range finder 21.
As a specific example, the first left laser rangefinder 22 is controlled to measure the distance L1c from the left side of the calibration plate 4 to the laser emission site. W1 ═ R1c + L1c + D was taken as the initial width of the first measurement point after calibration. Similarly, W2 ═ R2c + L2c + D was used as the initial width of the second measurement point after calibration.
As a specific embodiment, the structural cover 1 is installed on both sides of the bicycle lane according to the layout of the lane and the convenience of practical use. And mounting bolts are reserved on the road surface, mounting holes are reserved at the bottom of the right shell 11, and the two are fixed by nuts.
As a specific embodiment, each laser distance measuring instrument is reserved with a mounting hole, and is fixed with a mounting plate at the bottom of the structural shell 1 by using a screw.
In a specific embodiment, the mounting plate is adjusted in a certain distance in a bidirectional manner by a bidirectional oblong screw hole.
As a specific embodiment, the mounting plate has a certain angle adjustment amount at the same time, and the angle can be adjusted in a small-amplitude manner by mounting the gasket.
As a specific example, the distance adjustment and the angle adjustment are mainly used for adjusting the laser beams of the two laser range finders to be parallel to each other as much as possible.
As a specific example, the present invention designs the calibration plate 4 as an initial value of the width to be measured quickly in consideration of the practical utility of the apparatus and the influence of the actual deviation angle of the laser beam as described above.
In a specific embodiment, the first measuring point and the second measuring point are respectively calibrated, and the calibrated widths W1 and W2 are taken as preset values for the rapid tire width measurement calculation.
As a specific example, after the device is used for a long time, due to human impact, environmental changes, peripheral facility influence and other factors, the calibration plate 4 can be used for recalibrating the measuring device so as to ensure the accuracy of the data of the measuring device.
As a specific embodiment, the laser distance meter can adopt the existing product, and the measuring precision of the laser distance meter needs to reach 1mm magnitude in order to improve the recognition rate because the width of the wheel is changed within the range of 2 mm-15 mm.
As a specific example, the laser range finder is installed at the bottom of the left and right structural shells to determine the height of the light beam which is not higher than the tire and the lower edge of the wheel rim corresponding to the road narrow-tire bicycle (the known narrowest tire).
As a specific embodiment, the laser distance measuring instrument can measure the laser reflected by the tire sidewall in a non-contact way only when the light beam is positioned at the low position, so the laser distance measuring instrument needs to adopt a flat structure to meet the requirement of the light beam position.
As a specific example, tires such as bicycles and the like are generally black surface structures with rough textures, which is beneficial to laser ranging.
As specific embodiment, the transparent protective cover is additionally arranged on the outer side of the laser range finder on the structural shell, so that the vehicle and hard foreign matters are prevented from colliding with the measuring surface of the laser range finder. The structure shell and the laser range finder both adopt sealing structures, and can work all the day.
As a specific embodiment, the laser range finder adopts direct current power supply and communicates with the control host through a network port or a serial port.
As a specific example, the calibration plate can be made of aluminum alloy plate, with a fixed thickness, for example 1mm, and with a three-point support at the bottom to facilitate the determination of the plane.
As a specific example, the size of the calibration plate needs to cover the beam spacing of the measurement point laser rangefinder by height.
As a specific example, the tread measurement algorithm may process a logical sequential determination of the measurement points before and after.
The invention achieves the following significant beneficial effects:
the realization is simple, include: the laser range finder set comprises a structural shell, a laser range finder set and a control host; the structure shell is used for providing a structure installation position and a determined distance measurement geometric quantity initial value for the laser distance measuring instrument set and the control host, and comprises the following components: the vehicle passing identification device comprises a right shell and a left shell, wherein a region between the right shell and the left shell is a vehicle passing identification region; the laser range finder group is arranged at the bottom of the structural shell, is close to the ground and has a certain height from the ground by a laser beam, is used for measuring distance information data and feeding back a trigger signal to the control host, and at least comprises a first group of laser range finders used for measuring a measuring point which a vehicle passes through firstly and a second group of laser range finders used for measuring a measuring point which the vehicle passes through later, wherein a certain distance exists between the first group of laser range finders and the second group of laser range finders in the vehicle passing direction, and the heights of the laser beams are kept consistent; the control host is installed in the structure shell and is in communication connection with the laser range finder group, laser beams of the laser range finder group are blocked by passing vehicle wheels and then trigger signals are sent to the control host by the laser range finder, and when a bicycle passes through a vehicle identification area, the number of front wheels, rear wheels and vehicles of the vehicle is judged according to the trigger sequence and times. The invention can measure the widths of front and rear tires of bicycles, electric vehicles, motorcycles, scooters and other vehicles passing through the channels of the device and send the measurement results to the control host for judgment. The width of the tires of a vehicle, such as a bicycle, passing therebetween can be measured while riding fast, without stopping and pushing, and the vehicle can deviate from the center line within the lane, without being affected by the amount of deviation.
Any other suitable modifications can be made according to the technical scheme and the conception of the invention. All such alternatives, modifications and improvements as would be obvious to one skilled in the art are intended to be included within the scope of the invention as defined by the appended claims.
Claims (2)
1. A bicycle tire width non-contact rapid measurement device, comprising: the laser range finder set comprises a structural shell, a laser range finder set and a control host;
the structure shell is used for providing a structure installation position and a determined distance measurement geometric quantity initial value for the laser distance measuring instrument group and the control host, and comprises: the vehicle passing identification device comprises a right shell and a left shell, wherein a region between the right shell and the left shell is a vehicle passing identification region;
the laser range finder group is arranged at the bottom of the structural shell, is close to the ground, has a certain height from the ground for measuring distance information data and feeding back a trigger signal to the control host, and at least comprises a first group of laser range finders for measuring a measuring point which is passed by a vehicle firstly and a second group of laser range finders for measuring a measuring point which is passed by the vehicle later, wherein a certain distance exists between the first group of laser range finders and the second group of laser range finders in the vehicle passing direction, and the heights of the laser beams are kept consistent;
the control host is arranged in the structural shell and is in communication connection with the laser range finder group, laser beams of the laser range finder group are blocked by passing vehicle wheels and then trigger signals are sent to the control host by the laser range finder, and when a bicycle passes through the vehicle passing identification area, the number of front wheels, rear wheels and vehicles of the bicycle is judged according to the trigger sequence and times;
further comprising: the calibration plate is placed in the vacant space in the structural shell and used for being taken out and calibrated when the calibration is needed;
the laser range finder set includes: a first right laser range finder, a second right laser range finder, a first left laser range finder, a second left laser range finder, wherein,
the first right laser range finder and the second right laser range finder are arranged at the bottom of the right shell;
the first left laser range finder and the second left laser range finder are arranged at the bottom of the left shell;
the first right laser range finder and the first left laser range finder are installed in a centrosymmetric mirror manner;
the second right laser range finder and the second left laser range finder are installed in a centrosymmetric mirror manner;
the first right laser range finder and the first left laser range finder form a first measuring point, and the first measuring point is positioned in front of the length central line;
the second right laser range finder and the second left laser range finder form a second measuring point, and the second measuring point is positioned behind the length central line;
the first right laser range finder continuously acquires distance information R1 between the laser emission end surface of the first right laser range finder and the right tire wall of the wheel after the wheel passes triggering;
the first left laser distance meter is triggered later than the first right laser distance meter, and the distance information L1 between the laser emission end surface of the wheel and the tire wall on the left side of the wheel is continuously collected after the wheel passes through the triggering;
the collected R1 and L1 are a group of values, the group of values is from the moment when the wheel cuts off the laser beam to the moment when the wheel exits the laser beam area, and the values of the beam are restored to 1R and 1L and are cut off;
calculating a numerical value group of 1R-R1-L1 and a numerical value group of 1L-R1-L1 when the vehicle passes through the first measuring point in a sampling threshold interval, and calculating an average value to be used as the width B1 of the front wheel of the vehicle; calculating the numerical value group of 2R-R2-L2 and the numerical value group of 2L-R2-L2 when the wheel passes through the second measuring point, and calculating the average value as the width B2 of the front wheel of the vehicle; comparing B1 and B2, taking min (B1, B2) as the non-contact measurement of the tire width of the front wheel; similarly, the same measurement method is adopted for the rear wheel of the vehicle, and min (B1B, B2B) is taken as the non-contact measurement value of the tire width of the rear wheel;
the calibration plate is a flat plate with fixed thickness, the longitudinal dimension of the calibration plate is larger than the interval of laser beams between the first right laser range finder and the second right laser range finder, and the thickness of the calibration plate is D;
during calibration, the calibration plate is vertically placed at any position in a first measurement point, and a control host is used for measuring the distance R1c from the right side surface of the calibration plate to the laser emission end surface by using a first right laser range finder;
and controlling the first left laser distance meter to measure the distance L1c from the left side surface of the calibration plate to the laser emission end surface, taking W1 as R1c + L1c + D as the initial width of the first measurement point after calibration, and taking W2 as R2c + L2c + D as the initial width of the second measurement point after calibration in the same way.
2. A non-contact type rapid measuring method for the width of a bicycle tire is characterized by comprising the following steps:
firstly, providing a structural shell, a laser range finder group and a control host; the structural shell includes: the vehicle passing identification device comprises a right shell and a left shell, wherein a region between the right shell and the left shell is a vehicle passing identification region; the laser range finder group is arranged at the bottom of the structural shell and is close to the ground, the laser beam has a certain height away from the ground, the laser range finder group at least comprises a first group of laser range finders used for measuring points through which vehicles pass firstly and a second group of laser range finders used for measuring points through which vehicles pass later, a certain distance exists between the first group of laser range finders and the second group of laser range finders in the passing direction of the vehicles, the heights of the laser beams are kept consistent, and the control host is arranged in the structural shell and is in communication connection with the laser range finder group;
then, when the bicycle passes through the vehicle passing identification area, the laser range finder set starts to measure distance information data, and laser beams of the laser range finder set are blocked by passing vehicle wheels and then are sent to the control host by the laser range finder;
finally, the control host receives the feedback trigger signal and judges the number of front wheels, rear wheels and vehicles of the vehicle according to the trigger sequence and the number of times;
the laser range finder set includes: a first right laser range finder, a second right laser range finder, a first left laser range finder, a second left laser range finder, wherein,
the first right laser range finder and the second right laser range finder are arranged at the bottom of the right shell;
the first left laser range finder and the second left laser range finder are arranged at the bottom of the left shell;
the first right laser range finder and the first left laser range finder are installed in a centrosymmetric mirror manner;
the second right laser range finder and the second left laser range finder are arranged in a centrosymmetric mirror manner;
the first right laser range finder, the first left laser range finder and the second right laser range finder are used, the second left laser range finder keeps continuous measurement in a no-vehicle passing state, and laser beams keep irradiating on the surfaces of the structural shells opposite to each other;
the first right laser range finder is used for continuously acquiring distance information R1 from a laser emission end face to a tire wall on the right side of the wheel after the wheel passes through triggering;
the first left laser distance meter is triggered later than the first right laser distance meter, and the distance information L1 between the laser emission end surface of the wheel and the tire wall on the left side of the wheel is continuously collected after the wheel passes through the triggering;
the collected R1 and L1 are a group of values, the group of values starts from the moment that the wheel cuts off the laser beam, and when the wheel exits from the laser beam area, the light beam recovers the 1R and 1L values and is cut off;
further comprising: carrying out calibration measurement by adopting a calibration plate, wherein the calibration plate is placed in a vacant space in the structural shell;
performing a calibration measurement using a calibration plate, comprising:
the first right laser range finder continuously acquires distance information R1 between the laser emission end surface of the first right laser range finder and the right tire wall of the wheel after the wheel passes triggering;
the first left laser distance meter is triggered later than the first right laser distance meter, and the distance information L1 between the laser emission end surface of the wheel and the tire wall on the left side of the wheel is continuously collected after the wheel passes through the triggering;
according to the collected R1 and L1, the calibration initial value is adopted, the laser beam is cut off from the wheel, and the light beam is recovered to the 1R and 1L values and is cut off when the wheel exits from the laser beam area;
calculating a numerical value group of 1R-R1-L1 and a numerical value group of 1L-R1-L1 when the vehicle passes through the first measuring point in a sampling threshold interval, and calculating an average value to be used as the width B1 of the front wheel of the vehicle; calculating the numerical value group of 2R-R2-L2 and the numerical value group of 2L-R2-L2 when the wheel passes through the second measuring point, and calculating the average value as the width B2 of the front wheel of the vehicle; comparing B1 and B2, taking min (B1, B2) as the non-contact measurement of the tire width of the front wheel; similarly, the same measurement method is adopted for the rear wheel of the vehicle, and min (B1B, B2B) is taken as the non-contact measurement value of the tire width of the rear wheel;
the calibration plate is a flat plate with fixed thickness, the longitudinal dimension of the calibration plate is larger than the interval of laser beams between the first right laser range finder and the second right laser range finder, and the thickness of the calibration plate is D;
during calibration, the calibration plate is vertically placed at any position in a first measurement point, and a control host is used for measuring the distance R1c from the right side surface of the calibration plate to the laser emission end surface by using a first right laser range finder;
and controlling the first left laser distance meter to measure the distance L1c from the left side surface of the calibration plate to the laser emission end surface, taking W1 as R1c + L1c + D as the initial width of the first measurement point after calibration, and taking W2 as R2c + L2c + D as the initial width of the second measurement point after calibration in the same way.
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| JP2008196962A (en) * | 2007-02-13 | 2008-08-28 | Toyota Motor Corp | Device for measuring tire |
| JP6772565B2 (en) * | 2016-06-06 | 2020-10-21 | 日本電気株式会社 | Width measuring system, width measuring device, method and program |
| CN107447699B (en) * | 2016-12-14 | 2019-10-25 | 北京无线电计量测试研究所 | A kind of high-adaptability cycle path intelligent gate system |
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| CN110298308B (en) * | 2019-06-28 | 2022-03-04 | 北京无线电计量测试研究所 | Special road vehicle and pedestrian recognition system for bicycle |
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