CN116429451A - Track offset measuring device and method - Google Patents
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Abstract
The invention relates to the technical field of automobile and trailer detection test equipment, in particular to a track offset measuring device and a track offset measuring method, wherein the track offset measuring device comprises the following components: the system comprises a dot laser emitter, a shooting mechanism and a processor. The dot laser transmitters are used for being installed on a tested vehicle, irradiating vertically downwards and irradiating on the ground to form a ground laser dot; the shooting mechanism is used for being installed on the tested vehicle and shooting images of a ground laser point and a ground reference line when the tested vehicle runs; the processor is in signal connection with the shooting mechanism and is used for acquiring images shot by the shooting mechanism and determining the running deviation amount of the tested vehicle according to the images of the ground laser points and the ground reference line. The scheme can solve the problems that the water trace method is only suitable for a low-speed short distance, the accuracy is poor, the operation is inconvenient, and the GPS positioning method mainly has high cost and poor accuracy in the prior art.
Description
Technical Field
The invention relates to the technical field of automobile and trailer detection test equipment, in particular to a track offset measuring device and a track offset measuring method.
Background
There are many items in the dynamic driving test of automobiles and trailers related to the movement track of a vehicle body member relative to the ground, for example: the swing amplitude of the center of the rear axle of the trailer relative to the center of the front axle of the trailer, which is specified in national standard GB/T26778-2011 "automobile train Performance requirement and test method" and industry Standard JT/T1178.2-2019 "commercial truck safety technical Condition part 2 traction vehicle and trailer"; the vehicle deflection value specified in GB1589-2016 (vehicle, trailer and train overall size, axle load and mass limit), and the deflection quantity specified in GBT38679-2020 (vehicle running deflection test method); the GBT26773-2011 is related to the running track of the vehicle, such as lane departure amount specified in standards such as intelligent transportation system lane departure alarm system performance requirement and detection method and the like.
At present, two schemes are mainly adopted in the related detection in the industry: one is to install a drip device on a vehicle, and spray water droplets onto the ground to form a track line, and the other is to adopt a GPS plus positioning base station system.
However, these two solutions have respectively different drawbacks: the water trace method is only suitable for a low-speed short distance, has poor precision and is inconvenient to operate; the GPS positioning method mainly has the defects of high cost and poor precision.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a track offset measuring device and a track offset measuring method, which can solve the problems that a water track method is only suitable for a low-speed short distance, has poor precision and inconvenient operation in the prior art, and a GPS positioning method mainly has high cost and poor precision.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides a track offset measuring apparatus, including:
the dot laser transmitters are used for being installed on a tested vehicle, irradiating vertically downwards and irradiating on the ground to form a ground laser dot;
a photographing mechanism for being mounted on the vehicle to be measured, photographing an image of a ground laser spot and a ground reference line when the vehicle to be measured is traveling;
and the processor is in signal connection with the shooting mechanism and is used for acquiring images shot by the shooting mechanism and determining the running deviation of the tested vehicle according to the images of the ground laser points and the ground reference line.
In some alternatives, a laser transmitter is used to send a surface datum to the surface.
In some alternatives, the processor includes:
an analysis unit for determining the running deviation amount of the vehicle to be tested according to the images of the ground laser point and the ground reference line;
and the display unit is used for being arranged in the tested vehicle to display the data of the running deviation amount of the tested vehicle.
On the other hand, the invention also provides a track offset measuring method, which is realized by using the track offset measuring device described in any one of the above, and comprises the following steps:
the tested vehicle runs according to the standard specified speed and steering wheel operation requirement, and images of the ground laser point and the ground reference line are shot when the tested vehicle runs;
and determining the running deviation amount of the tested vehicle according to the images of the ground laser point and the ground reference line when the tested vehicle runs.
In some alternatives, a laser transmitter is used to transmit a line beam along the road centerline on the test road to land on the ground to form a ground datum.
In some alternative solutions, before the tested vehicle runs according to the vehicle speed and steering wheel operation requirement specified by the standard, the method further comprises the step of obtaining a reference dimension, wherein the reference dimension is used for determining the running deviation amount of the tested vehicle.
In some alternatives, the obtaining the reference size includes:
parking the tested vehicle parallel to a ground datum line, so that the ground laser point and the ground datum line are separated by a set distance;
acquiring a shot image of the ground laser point and a ground reference line, and actually measuring the distance between the ground laser point and the ground reference line;
and acquiring a proportional relation between the photographed image and the distance between the ground laser point and the ground reference line in actual measurement.
In some alternative solutions, when the vehicle to be tested is parked parallel to the ground reference line, the ground laser point is spaced from the ground reference line by a set distance of 0.4-0.6m.
In some optional solutions, the determining the running deviation of the measured vehicle according to the image of the ground laser point and the ground reference line when the measured vehicle runs includes:
and determining the running deviation of the tested vehicle according to the proportional relation between the photographed image and the distance between the ground laser point and the ground reference line in actual measurement and combining the images of the ground laser point and the ground reference line when the tested vehicle runs.
In some alternative schemes, the running deviation amount of the tested vehicle is displayed in the vehicle according to the set frequency through a display unit.
Compared with the prior art, the invention has the advantages that: when the track offset measuring device is used, a dot laser emitter is arranged at the midpoint position of the front end of a measured vehicle, the dot laser emitter is vertically downward and irradiates on the ground to form a ground laser spot, a straight marking line is arranged on a road on which the measured vehicle runs when being detected as a ground datum line, a shooting mechanism is arranged near the dot laser emitter, and the adjustment of the height and the focal length ensures that the view angle range of the shooting mechanism can cover the ground datum line on the ground and the extreme position of the deviation of the ground laser spot; the method comprises the steps of enabling a tested vehicle to run along a ground datum line, transmitting images of the ground laser points acquired by a shooting mechanism relative to the ground datum line to a processor in real time in the running process of the tested vehicle, automatically capturing the ground laser points and the ground datum line in images by the processor, and determining running deviation amount of the tested vehicle according to the images of the ground laser points and the ground datum line. The scheme is suitable for various vehicle speeds and distance conditions, and is generally suitable for detection of various running track items; compared with the existing water trace method with the accuracy of centimeter level, the measuring accuracy of the scheme can be improved to millimeter level; compared with a GPS+positioning base station method, the test cost of the scheme is reduced by more than 80%; and the track curve and the offset test result are displayed in real time through the display, so that the method is visual and convenient.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a track offset measuring device according to an embodiment of the invention.
In the figure: 1. a dot laser emitter; 2. a vehicle to be tested; 3. a ground laser spot; 4. a ground datum line; 5. a photographing mechanism; 6. a processor; 7. a laser emitter.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a track offset measuring device according to an embodiment of the invention. As shown in fig. 1, the present invention provides a track offset measuring apparatus, including: a dot laser emitter 1, a photographing mechanism 5 and a processor 6.
The dot laser transmitters 1 are used for being installed on a tested vehicle 2, irradiating downwards vertically and irradiating on the ground to form a ground laser dot 3; the shooting mechanism 5 is used for being installed on the tested vehicle 2 and shooting images of the ground laser point 3 and the ground reference line 4 when the tested vehicle 2 runs; the processor 6 is in signal connection with the shooting mechanism 5, and is used for acquiring images shot by the shooting mechanism 5 and determining the running deviation amount of the tested vehicle 2 according to the images of the ground laser point 3 and the ground reference line 4.
When the track offset measuring device is used, a dot laser emitter 1 is arranged at the midpoint position of the front end of a vehicle 2 to be measured, the dot laser emitter 1 faces downwards vertically and irradiates the ground to form a ground laser spot 3, a straight marking line is arranged on a road on which the vehicle 2 to be measured runs when being detected as a ground datum line 4, a shooting mechanism 5 is arranged near the dot laser emitter 1, and the adjustment of the height and the focal length ensures that the view angle range can cover the ground datum line 4 on the ground and the deviating limit position of the ground laser spot 3; the measured vehicle 2 is driven along the ground reference line 4, the image of the ground laser spot 3 relative to the ground reference line 4 acquired by the shooting mechanism 5 is transmitted to the processor 6 in real time in the driving process of the measured vehicle 2, the processor 6 automatically captures the ground laser spot 3 and the ground reference line 4 in the image, and the driving deflection quantity of the measured vehicle 2 is determined according to the images of the ground laser spot 3 and the ground reference line 4.
The scheme is suitable for various vehicle speeds and distance conditions, and is generally suitable for detection of various running track items; compared with the existing water trace method with the accuracy of centimeter level, the measuring accuracy of the scheme can be improved to millimeter level; compared with a GPS+positioning base station method, the test cost of the scheme is reduced by more than 80%; and the track curve and the offset test result are displayed in real time through the display, so that the method is visual and convenient.
In this example, the photographing mechanism 5 is a camera, and when determining the running deviation of the vehicle 2 to be measured according to the images of the ground laser spot 3 and the ground reference line 4, the relative distance between the ground laser spot 3 and the ground reference line 4 can be determined by image processing through the mounting position and focal length of the camera. The measured vehicle 2 can be stopped at a position parallel to the ground reference line 4 before the running is detected, the ground laser spot 3 and the ground reference line 4 are separated by a certain distance, the actual distance between the ground laser spot 3 and the ground reference line 4 at the moment is actually measured, the dimension is accurately measured by using a measuring tool and is used as a reference dimension in the subsequent dynamic calculation, specifically, the number of pixels between the positions of the corresponding pixels of the ground laser spot 3 and the ground reference line 4 in an image shot by a camera is obtained, the actual length of each pixel in the image corresponding to the ground can be obtained, the measured vehicle 2 runs along the ground reference line 4 in the subsequent detection, and the number of pixels between the positions of the corresponding pixels of the ground laser spot 3 and the ground reference line 4 in the image shot by the camera can be obtained in real time, so that the actual distance between the ground laser spot 3 and the ground reference line 4 can be determined, and the running deviation of the measured vehicle 2 can be determined.
In addition, when the measured vehicle 2 is stopped at a position parallel to the ground datum line 4 and the ground laser spot 3 and the ground datum line 4 are separated by a certain distance, the actual distance between the ground laser spot 3 and the ground datum line 4 at the moment is actually measured, the number of pixels between the positions of the ground laser spot 3 and the ground datum line 4 corresponding to the pixel center point in the image shot by the camera is determined, and the actual length of the ground corresponding to each pixel in the image is used as a reference in the subsequent test, the distance between the ground laser spot 3 and the ground datum line 4 is 0.4-0.6m, and the distance can be determined according to the deviation limit value condition of the measured vehicle 2, so that the actual length of the ground corresponding to each pixel in the more accurate image can be obtained.
In some alternative implementations, the laser transmitter 7 is used to transmit the surface datum 4 to the surface.
In this embodiment, in order to adapt to the detected vehicle 2 at different positions or facilitate more flexible detection, a laser emitter 7 is installed on the ground, and a line beam is emitted by the laser emitter 7 along the central line of the road, and falls on the ground to form a ground datum line 4.
Of course, in other embodiments, a straight line may be drawn directly on the ground as the ground reference line 4, and the same effect can be achieved. Only each test can be run along the defined ground reference line 4, which may in some cases lead to some inconvenience.
In some alternative implementations, the processor 6 includes: an analysis unit and a display unit. The analysis unit is used for determining the running deviation amount of the tested vehicle 2 according to the images of the ground laser point 3 and the ground reference line 4; the display unit is used for being arranged in the tested vehicle 2 to display the data of the running deviation amount of the tested vehicle 2.
In this embodiment, in order to enable the tester to obtain the data of the running deviation more intuitively, the display unit is disposed in the vehicle, and the display unit can display the images of the ground laser point 3 and the ground reference line 4 obtained in real time, so that the tester can see the real-time distance change between the ground laser point 3 and the ground reference line 4 through the images displayed in real time, which is more intuitive. On the other hand, the analysis unit is used for determining the real-time distance between the ground laser spot 3 and the ground reference line 4 according to the images of the ground laser spot 3 and the ground reference line 4, so as to determine the running deviation amount of the tested vehicle 2. And the running deviation value of the tested vehicle 2 is displayed on the display unit, so that test personnel can acquire test data more intuitively.
In other embodiments, detection of the vehicle yaw, trailer sway amplitude, lane offset, etc. may also be achieved by varying the mounting location, number of emitted beams, and radius of curvature of the laser emitters 7.
On the other hand, as shown in fig. 1, the present invention further provides a track offset measurement method, which is implemented by using the track offset measurement device described in any one of the above, and includes the following steps:
s1: the vehicle 2 is driven at a vehicle speed and a steering wheel operation request specified by a standard, and an image of the ground laser spot 3 and the ground reference line 4 is captured when the vehicle 2 is driven.
Before the tested vehicle 2 runs according to the standard speed and steering wheel operation requirement, a dot laser emitter 1 is arranged at the midpoint position of the front end of the tested vehicle 2, the dot laser emitter 1 vertically faces downwards and irradiates the ground to form a ground laser spot 3, a straight marking line is arranged on a road on which the tested vehicle 2 runs when being detected as a ground datum line 4, a shooting mechanism 5 is arranged near the dot laser emitter 1, and the adjustment of the height and the focal length ensures that the visual angle range can cover the extreme positions of the ground datum line 4 and the ground laser spot 3 on the ground.
The measured vehicle 2 is driven along the ground datum line 4 according to the vehicle speed and steering wheel operation requirement specified by the standard, such as the position A-A in fig. 1, the image of the ground laser spot 3 relative to the ground datum line 4 acquired by the shooting mechanism 5 is utilized in the driving process of the measured vehicle 2 (such as the position B-B in fig. 1), and the image of the ground laser spot 3 relative to the ground datum line 4 acquired by the shooting mechanism 5 is transmitted to the processor.
In some alternative embodiments, a laser transmitter 7 is used to transmit a line beam along the road centerline on the test road to land on the ground to form the ground reference line 4.
In this example, in order to adapt to the detected vehicle to detect at different positions or facilitate more flexible detection, a laser emitter 7 is installed on the ground, and a line beam is emitted by the laser emitter 7 along the central line of the road and falls on the ground to form a ground datum line 4.
Of course, in other embodiments, a straight line may be drawn directly on the ground as the ground reference line 4, and the same effect can be achieved. Only each test can be run along the defined ground reference line 4, which may in some cases lead to some inconvenience.
S2: the running deviation amount of the vehicle 2 to be measured is determined based on the images of the ground laser spot 3 and the ground reference line 4 when the vehicle 2 to be measured is running.
Specifically, the processor 6 automatically captures the ground laser spot 3 and the ground reference line 4 in the image, and determines the running deviation amount of the vehicle 2 to be measured from the images of the ground laser spot 3 and the ground reference line 4.
In some alternative embodiments, before the tested vehicle 2 is driven according to the vehicle speed and steering wheel operation requirement specified by the standard, the method further comprises the step of acquiring a reference dimension, wherein the reference dimension is used for determining the running deviation amount of the tested vehicle 2. The reference size can be used as a reference size in subsequent dynamic calculations.
In some alternative embodiments, the obtaining the reference dimension includes the steps of:
a: the vehicle 2 to be measured is parked parallel to the ground reference line 4, and the ground laser spot 3 is spaced from the ground reference line 4 by a set distance.
Parking the vehicle 2 parallel to the ground reference line 4 means that the center axis of the vehicle 2 is parallel to the ground reference line 4.
B: a photographed image photographing the ground laser spot 3 and the ground reference line 4 is acquired, and a distance between the ground laser spot 3 and the ground reference line 4 is actually measured.
C: a proportional relation between the photographed image and the distance between the ground laser spot 3 and the ground reference line 4 in actual measurement is obtained.
In this example, before the detected vehicle runs, the detected vehicle is stopped at a position parallel to the ground datum line 4, the ground laser spot 3 and the ground datum line 4 are separated by a certain distance, the actual distance between the ground laser spot 3 and the ground datum line 4 at the moment is actually measured, the measuring tool is used for accurately measuring the dimension and is used as a reference dimension in the subsequent dynamic calculation, specifically, the number of pixels between the positions of the corresponding pixel centers of the ground laser spot 3 and the ground datum line 4 in the image shot by the camera is obtained, the actual length of each pixel in the image corresponding to the ground can be obtained, the detected vehicle 2 runs along the ground datum line 4 in the subsequent detection, the number of pixels between the positions of the corresponding pixel centers of the ground laser spot 3 and the ground datum line 4 in the image shot by the camera is obtained in real time, and the actual distance between the ground laser spot 3 and the ground datum line 4 can be determined, so that the running deviation of the detected vehicle 2 is determined.
In some alternative embodiments, the ground laser spot 3 is spaced from the ground reference line 4 by a set distance of 0.4-0.6m when the vehicle 2 under test is parked parallel to the ground reference line 4. In this example, 0.5m was used.
The distance between the ground laser point 3 and the ground reference line 4 can be determined according to the deviation limit value of the measured vehicle, so that the actual length of the ground corresponding to each pixel in the more accurate image can be obtained.
In some alternative embodiments, the determining the running deviation of the tested vehicle 2 according to the images of the ground laser point 3 and the ground reference line 4 when the tested vehicle 2 runs includes:
and determining the running deviation amount of the measured vehicle 2 according to the proportional relation between the photographed image and the distance between the ground laser spot 3 and the ground reference line 4 in actual measurement and combining the images of the ground laser spot 3 and the ground reference line 4 when the measured vehicle 2 runs.
In the subsequent detection, the vehicle 2 to be detected runs along the ground reference line 4, the number of pixels between the ground laser spot 3 and the position of the corresponding pixel center point of the ground reference line 4 in the image shot by the camera is acquired in real time, the actual length corresponding to each pixel between the positions of the corresponding pixel center points of the ground laser spot 3 and the ground reference line 4 is acquired before, namely the actual distance between the ground laser spot 3 and the ground reference line 4 can be determined through the total number of pixels, and the running deviation of the vehicle 2 to be detected is determined.
In some alternative embodiments, the running deviation amount of the measured vehicle is displayed in the vehicle at a set frequency through a display unit.
In order to enable a tester to acquire the data of the running deviation more intuitively, the display unit is arranged in the vehicle, and can display the images of the ground laser point 3 and the ground reference line 4 acquired in real time, so that the tester can see the real-time distance change between the ground laser point 3 and the ground reference line 4 through the images displayed in real time, and the tester can be more intuitively. On the other hand, the analysis unit is used for determining the real-time distance between the ground laser spot 3 and the ground reference line 4 according to the images of the ground laser spot 3 and the ground reference line 4, so as to determine the running deviation amount of the tested vehicle 2. And the running deviation value of the tested vehicle 2 is displayed on the display unit, so that test personnel can acquire test data more intuitively.
In summary, when the track offset measuring device and the track offset measuring method are used, the dot laser emitter 1 is installed at the midpoint position of the front end of the vehicle 2 to be measured, the dot laser emitter 1 faces downwards vertically and irradiates the ground to form the ground laser spot 3, a straight marking line is arranged on the road on which the vehicle 2 to be measured runs as the ground reference line 4, the shooting mechanism 5 is installed near the dot laser emitter 1, and the adjustment of the height and the focal length ensures that the view angle range can cover the ground reference line 4 on the ground and the extreme position of the deviation of the ground laser spot 3; the measured vehicle 2 is driven along the ground reference line 4, the image of the ground laser spot 3 relative to the ground reference line 4 acquired by the shooting mechanism 5 is transmitted to the processor 6 in real time in the driving process of the measured vehicle 2, the processor 6 automatically captures the ground laser spot 3 and the ground reference line 4 in the image, and the driving deflection quantity of the measured vehicle 2 is determined according to the images of the ground laser spot 3 and the ground reference line 4.
The scheme is suitable for various vehicle speeds and distance conditions, and is generally suitable for detection of various running track items; compared with the existing water trace method with the accuracy of centimeter level, the measuring accuracy of the scheme can be improved to millimeter level; compared with a GPS+positioning base station method, the test cost of the scheme is reduced by more than 80%; and the track curve and the offset test result are displayed in real time through the display, so that the method is visual and convenient.
The photographing mechanism 5 is a camera, when determining the running deviation amount of the measured vehicle 2 according to the images of the ground laser spot 3 and the ground reference line 4, by stopping the measured vehicle at a position parallel to the ground reference line 4 before detecting running and making the ground laser spot 3 and the ground reference line 4 at a certain distance, by actually measuring the actual distance between the ground laser spot 3 and the ground reference line 4 at the moment, the dimension is accurately measured by using a measuring tool and used as a reference dimension in the subsequent dynamic calculation, specifically, the number of pixels between the positions of the corresponding pixels of the ground laser spot 3 and the ground reference line 4 in the image photographed by the camera is obtained, thus the actual length of the ground corresponding to each pixel in the image can be obtained, the measured vehicle 2 runs along the ground reference line 4 in the subsequent detection, and the actual distance between the corresponding pixels of the ground laser spot 3 and the ground reference line 4 in the image photographed by the camera can be determined in real time, thereby determining the running deviation amount of the measured vehicle 2.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A track offset measuring device, comprising:
the round dot laser transmitter (1) is used for being installed on a tested vehicle (2), irradiating downwards vertically and irradiating on the ground to form a ground laser spot (3);
a photographing mechanism (5) for being mounted on the vehicle (2) to be tested, photographing images of the ground laser spot (3) and the ground reference line (4) when the vehicle (2) to be tested is traveling;
and the processor (6) is in signal connection with the shooting mechanism (5) and is used for acquiring images shot by the shooting mechanism (5) and determining the running deviation amount of the tested vehicle (2) according to the images of the ground laser point (3) and the ground reference line (4).
2. The trajectory offset measurement device as claimed in claim 1, wherein: a laser emitter (7) for emitting a ground reference line (4) to the ground.
3. The trajectory offset measurement device as claimed in claim 1, characterized in that the processor (6) comprises:
an analysis unit for determining the running deviation amount of the vehicle (2) under test from the images of the ground laser spot (3) and the ground reference line (4);
and the display unit is used for being arranged in the tested vehicle (2) to display data of the running deviation amount of the tested vehicle (2).
4. A track offset measuring method, characterized in that it is realized by the track offset measuring device according to any one of claims 1-3, comprising the steps of:
the method comprises the steps of enabling a tested vehicle (2) to run according to the speed and steering wheel operation requirements specified by standards, and shooting images of a ground laser point (3) and a ground reference line (4) when the tested vehicle (2) runs;
and determining the running deviation amount of the tested vehicle (2) according to the images of the ground laser point (3) and the ground reference line (4) when the tested vehicle (2) runs.
5. A track offset measuring method as claimed in claim 4, characterized in that a laser transmitter (7) is used to transmit a line beam along the road center line on the test road to land on the ground to form the ground reference line (4).
6. The trajectory offset measurement method according to claim 5, characterized by further comprising the step of acquiring a reference dimension for determining a running offset of the vehicle (2) under test before the vehicle (2) under test is caused to run at a vehicle speed and a steering wheel operation requirement specified by a standard.
7. The track offset measurement method as claimed in claim 6, wherein the acquiring the reference size comprises:
parking a vehicle (2) to be tested parallel to a ground reference line (4), and enabling the ground laser point (3) and the ground reference line (4) to be separated by a set distance;
acquiring a shot image of the ground laser point (3) and the ground reference line (4), and actually measuring the distance between the ground laser point (3) and the ground reference line (4);
and acquiring a proportional relation between the photographed image and the distance between the ground laser point (3) and the ground reference line (4) in actual measurement.
8. The trajectory offset measurement method according to claim 7, characterized in that the ground laser spot (3) is spaced from the ground reference line (4) by a set distance of 0.4-0.6m when the vehicle (2) under test is parked parallel to the ground reference line (4).
9. The trajectory offset measurement method according to claim 7, wherein the determining the running offset of the vehicle (2) to be measured from the images of the ground laser point (3) and the ground reference line (4) when the vehicle (2) to be measured is running comprises:
and according to the proportional relation between the photographed image and the distance between the ground laser point (3) and the ground reference line (4) in actual measurement, determining the running deviation amount of the measured vehicle (2) by combining the images of the ground laser point (3) and the ground reference line (4) when the measured vehicle (2) runs.
10. The trajectory offset measurement method according to claim 9, characterized in that the running offset of the vehicle (2) under test is displayed in the vehicle at a set frequency by a display unit.
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| CN202310313409.8A CN116429451A (en) | 2023-03-28 | 2023-03-28 | Track offset measuring device and method |
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| CN202310313409.8A CN116429451A (en) | 2023-03-28 | 2023-03-28 | Track offset measuring device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117073583A (en) * | 2023-08-15 | 2023-11-17 | 中汽研汽车检验中心(武汉)有限公司 | Measuring device for measuring maximum width of turning channel |
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2023
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117073583A (en) * | 2023-08-15 | 2023-11-17 | 中汽研汽车检验中心(武汉)有限公司 | Measuring device for measuring maximum width of turning channel |
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