A laser height limit detection device

Abstract

The present invention relates to a laser height limit detection device, belonging to the technical field of height limit devices, including a height limit frame. A height limit rod is arranged on the height limit frame, and the height limit frame drives the height limit rod to move in the vertical direction. A laser detection array is arranged on the height limit rod. The laser detection array is used to detect the distance that a vehicle exceeds the limit height over time in the section to be detected and upload it to the control module. The control module determines that the cumulative value of the exceeding time and the exceeding height of a certain vehicle exceeds the height limit threshold, and issues an alarm and raises the height limit rod when the threshold is exceeded. It can cope with the situation of undulating sections and has high detection accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of height-limiting devices, and particularly relates to a laser height-limiting detection device. Background Art

[0002] With the economic development, the types of vehicles running on the road have become more diverse, such as sedans and trucks. When a truck transports special goods or is illegally modified, the structural height of the vehicle is too high. When such a vehicle passes through a height-limiting section, such as a tunnel or a bridge opening, there is a probability of collision with the structure above the height-limiting section. Therefore, it is necessary to set up a height-limiting device in front of the height-limiting section to give an early warning or restrict the passage of overly tall vehicles, such as a height-limiting pole.

[0003] In some cases, the overly tall vehicle is moving at a high speed and cannot stop in time in front of the height-limiting pole, resulting in a collision between the height-limiting pole and the overly tall vehicle. At this time, the height-limiting pole needs to play a reminder role before the vehicle approaches, and rise in time when the overly tall vehicle approaches quickly. For this reason, Chinese Patent CN117671909A discloses a laser height-limiting detection device and its warning system, including: a height-limiting mechanism, a control module, an alarm module, and a laser scanner. The control module is communicatively connected to the alarm module and the laser scanner. The laser scanner is installed on the side of the height-limiting mechanism, and the installation height of the laser scanner is used as the height to be detected for height limitation; the laser beam emitted by the laser scanner is horizontal to the ground and rotates back and forth to scan the front to detect whether there is an obstacle in the front. When an obstacle is detected in the front, the ultra-high information is transmitted to the control module in real time; during the process of rotating back and forth to scan the front, the rotation angle of the laser beam is 270 degrees; after receiving the ultra-high information, the control module processes and analyzes the ultra-high information to determine whether the overly tall vehicle falls within a preset range. If so, it controls the alarm module to continuously emit an alarm. It can give an early warning to the driver of the overly tall vehicle and avoid unnecessary losses.

[0004] However, in the above solution, due to the directivity of the laser, it can only perform height-limiting detection on objects with the same height as itself and without height change. For example, when there are slight undulations in the section to be detected due to construction errors, or because there are usually many overly tall vehicles passing through the section where height-limiting detection needs to be set up, and the average weight of the overly tall vehicles is heavier than that of ordinary vehicles, resulting in deformation of the section to be detected under pressure and thus slight undulations. When an overly tall vehicle with a relatively low degree of exceeding the height limit is driving on the slight undulation, at the low point of the undulation section, the top will be lower than the detection of the laser height-limiting device along with the vehicle in the trough and will not trigger an alarm. On the contrary, when a vehicle lower than the height limit is at the peak of the undulation section, it will cause the vehicle peak to exceed the laser detection and instead trigger a warning. Therefore, a laser height-limiting detection device that can cope with undulation sections and has high detection accuracy is needed. Summary of the Invention

[0005] To solve the above problems existing in the prior art, the present invention provides a laser height limit detection device, which has the characteristics of high detection accuracy in the case of undulating road sections.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] A laser height limit detection device includes a height limit frame, on which a height limit rod is provided. The height limit frame drives the height limit rod to move in the vertical direction. A laser detection array is provided on the height limit rod. The laser detection array is used to detect the distance that a vehicle exceeds the limit height over time in the road section to be detected and upload it to the control module. The control module determines whether the cumulative value of the exceeding time and the exceeding height of a certain vehicle within the acquisition time exceeds the height limit threshold, and issues an alarm and raises the height limit rod when the threshold is exceeded.

[0008] As a preferred technical solution of the present invention, the control module collects the distance J that a certain vehicle exceeds the limit height over time t, and plots a curve f(t) of J changing with time t. The control module determines whether the over-limit coefficient C exceeds the height limit threshold C0, and issues an alarm and raises the height limit rod when the threshold is exceeded, where , and T is a pre-input standard acquisition time.

[0009] As a preferred technical solution of the present invention, the laser detection array is also used to detect the road surface undulation degree and upload it to the control module. The control module determines whether the change degree of the road surface undulation degree compared with the standard undulation degree exceeds the threshold, and increases the height limit threshold when the judgment result is yes.

[0010] As a preferred technical solution of the present invention, the laser detection array is also used to detect the road surface undulation degree Q and upload it to the control module. The control module determines whether the change degree of the road surface undulation degree Q compared with the standard undulation degree Q0 exceeds the threshold, and adjusts the height limit threshold to C0×A1, where A1 = Q / Q0×c, and c is a pre-input constant.

[0011] As a preferred technical solution of the present invention, the laser detection array is also used to detect the vehicle speed and upload it to the control module. The control module is also used to determine whether the vehicle speed exceeds the threshold, and extends the acquisition time when the judgment result is yes.

[0012] As a preferred technical solution of the present invention, the laser detection array is also used to detect the vehicle speed v. The control module determines whether the over-limit coefficient C exceeds the height limit threshold C0, and issues an alarm and raises the height limit rod when the threshold is exceeded, where , and A2 = v / v0×d.

[0013] As a preferred technical solution of the present invention, it further includes an input panel, and the input panel is used to input the values of T, C0, and Q0.

[0014] The beneficial effects of the present invention are as follows:

[0015] (1) By enabling the control module to judge that the cumulative value of the overtime and over-height of a certain vehicle exceeds the height limit threshold, that is, to judge whether it exceeds the height limit threshold C0, and when it exceeds the threshold, an alarm is issued and the height limit bar is lifted to complete the warning for vehicles with a higher height, and at the same time, false alarms are avoided when the actual vehicle height is less than the height limit;

[0016] (2) By enabling the laser detection array to detect the road surface undulation degree, judging whether the change degree of the undulation degree compared with the standard undulation degree exceeds the threshold, and increasing the height limit threshold when the judgment result is yes, the measurement error caused by the undulation degree is reduced, and the detection accuracy is further improved;

[0017] (3) By enabling the control module to detect the vehicle speed and upload it to the control module, and extending the acquisition time when the judgment result of the vehicle speed exceeding the threshold, the inaccurate acquisition of the J value caused by too fast speed is avoided, and further the inaccurate judgment of whether it is too high is avoided, and the detection accuracy is improved. Description of the Drawings

[0018] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 is the structural schematic diagram of the present invention;

[0020] Figure 2 is the structural schematic diagram after the height limit bar of the present invention is lifted;

[0021] Figure 3 is the control circuit block diagram of the present invention.

[0022] Main Component Symbol Description:

[0023] In the figure: 1, height limit frame; 11, lifting device; 12, height limit bar; 2, laser detection array; 3, alarm; 4, control module. Detailed Embodiments

[0024] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in combination with the accompanying drawings and preferred embodiments, detail the specific embodiments, structures, features, and their effects of the present invention.

[0025] Please refer to Figures 1-3, a laser height limit detection device, including a height limit frame 1, on which a height limit bar 12 is provided, and the height limit frame 1 drives the height limit bar 12 to move in the vertical direction;

[0026] Specifically, the height limit frame 1 at least includes two support rods perpendicular to the ground, and a lifting device 11 is provided on each support rod. The lifting devices 11 on the two support rods can move synchronously along the axial direction of the support rods. The two ends of the height limit bar 12 are respectively placed on the lifting devices 11. At the same time, a control module 4 is provided in the height limit frame 1, and the control module 4 is used to command the lifting of the lifting device 11;

[0027] In some cases, the speed of the over-height vehicle is relatively fast and it cannot stop in time in front of the height limit bar 12, resulting in a collision between the height limit bar 12 and the over-height vehicle. At this time, the height limit bar 12 needs to play a reminder role before the vehicle approaches, and rise in time when the over-height vehicle approaches quickly. For this reason, a laser detection array 2 is provided on the height limit bar 12. The laser detection array 2 is used to detect that the vehicle in the section to be detected exceeds the limit height over time and upload it to the control module 4. The control module 4 commands the lifting device 11 to raise the height limit bar 12 when it is judged necessary;

[0028] Specifically, the laser detection array 2 is provided with a detection space, and the setting position of the detection space ensures that the bottom surface of the detection space is at the same level as the limit height. At this time, the laser detection array 2 detects whether there is an object exceeding the limit height through the ranging principle. When the over-height vehicle exists above the bottom surface of the detection space of the laser detection array 2, and when the laser detection array 2 detects that there is an object exceeding the bottom surface of the detection space, the laser detection array 2 detects the height by which this object exceeds the bottom surface of the detection space over time;

[0029] For multiple vehicles exceeding the limit height and being detected by the laser detection array 2 at the same time, it judges which independent entities exist in the detection space by means of shape scanning. Each independent entity represents a measured vehicle. Subsequently, the laser detection array 2 assigns an independent number to each entity in the detection space, and distinguishes and detects the exceeding shape and exceeding height of each entity according to the number, so as to avoid interrupting the detection of a certain vehicle;

[0030] Due to the directivity of the laser, it can only perform height limit detection on objects at the same height as itself without height changes. For example, when there are slight undulations in the section to be detected due to construction errors, or when there are usually many overly tall vehicles passing through the section where height limit detection needs to be set, and the average weight of the overly tall vehicles is heavier than that of ordinary vehicles, resulting in deformation of the section to be detected under pressure and thus slight undulations. When an overly tall vehicle with a height slightly exceeding the height limit drives on the slight undulation, at the low point of the undulating section, the top will be lower than the detection of the laser height limit device along with the vehicle in the trough and will not trigger an alarm. On the contrary, when a vehicle below the height limit is at the apex of the undulating section, it will cause the vehicle apex to exceed the laser detection, resulting in a false alarm. Therefore, the control module 4 determines that the cumulative value of the exceeding time and exceeding height of a certain vehicle within the acquisition time exceeds the height limit threshold, and issues an alarm and raises the height limit bar 12 when the threshold is exceeded;

[0031] Specifically, the control module 4 collects the distance J by which a certain vehicle exceeds the restricted height as time t increases, and plots the curve f(t) of J changing with time t. The control module 4 determines whether the over-limit coefficient C exceeds the height limit threshold C0, and issues an alarm and raises the height limit bar 12 when the threshold is exceeded, where , T is the pre-input standard acquisition time;

[0032] For each numbered entity, every time the control module 4 receives the distance J by which it exceeds the restricted height, it archives it according to time, and then plots the curve f(t) of J changing with time t. At this time, for each vehicle that exceeds the height limit during driving, there is a corresponding f(t) curve; [[ID=IO]]

[0033] is the integral of the curve f(t) of J changing with time t within the acquisition time, representing the total accumulated distance exceeding the restricted height during the detection time. When a vehicle is relatively tall, when it drives on the undulating section, the part exceeding the height limit is relatively large, and the total accumulated distance exceeding the restricted height during the detection time is relatively large. Since the section where height limit is required often does not support slow driving or long-term parking of vehicles, when the integral value is relatively large and exceeds a certain value, there is a high probability that it is caused by the relatively high height. Therefore, at this time, the control module 4 issues an alarm through the alarm 3 and raises the height limit bar 12;

[0034] Similarly, when C is small, it means that although a certain vehicle exceeds the height limit to a certain extent during driving, the exceeding degree is small. Therefore, there is a high probability that it is only a temporary exceeding of the height limit at a high place caused by the undulating section, and the actual vehicle height is less than the height limit. At this time, the control module 4 does not issue an alarm to avoid false alarms caused by the undulating section;

[0035] Meanwhile, by calculating the integral of the curve f(t) of J varying with time t within the acquisition time, the total height by which each vehicle exceeds the restricted height over time can be statistically obtained, which can avoid the recording error in the exceeded distance caused by factors such as the swaying of a vehicle during driving. For example, when the suspension damping of a certain vehicle is low and it vibrates up and down continuously when driving on a hilly section, and the vibration can be regarded as a sine wave fluctuating around a certain definite value over time. As reflected in the detection result of the laser detection array 2, the exceeded distance J from the restricted height continuously fluctuates around a certain definite value in a sine wave. If the J value is detected discretely, it is difficult to cancel out the error caused by the continuous vibration. By calculating , the J values at any moment during the entire vibration process can be included in the calculation. And since the fluctuation of J is around a certain definite value, the value obtained by including the J values at any moment during the entire process in the calculation is close to the value without fluctuation. Compared with discrete recording, the recording accuracy is further improved;

[0036] By enabling the control module 4 to judge that the cumulative value of the exceeded time and exceeded height of a certain vehicle exceeds the height limit threshold, that is, to judge whether it exceeds the height limit threshold C0, and when the threshold is exceeded, an alarm is issued to raise the height limit rod 12, completing the warning for vehicles with a higher height, and at the same time avoiding false alarms when the actual vehicle height is less than the height limit.

[0037] In the above solution, the heights of the valleys and peaks of different hilly sections are different. Since the formation reason of the hilly section includes that over - weight vehicles applying pressure to the section to be detected for a long time generate slight undulations, the undulation degree of the hilly section will change with use. As the undulation degree changes, the exceeded height J of the vehicle from the height limit will also change, and then the calculated C value of each vehicle will also change. There is a probability that the C value does not exceed C0 in a certain state of the hilly section, while C exceeds C0 in the next state, affecting the detection accuracy. For this reason, the laser detection array 2 is also used to detect the road surface undulation degree and upload it to the control module 4. The control module 4 judges whether the change degree of the road surface undulation degree compared with the standard undulation degree exceeds the threshold, and when the judgment result is yes, the height limit threshold is increased;

[0038] Specifically, there is a laser detector in the laser detection array 2 dedicated to mapping the section to be detected. The laser detection array 2 is used to detect the road surface undulation degree Q and upload it to the control module 4. The control module 4 judges whether the change degree of the road surface undulation degree Q compared with the standard undulation degree Q0 exceeds the threshold, and adjusts the height limit threshold to C0×A1, where A1 = Q / Q0×c, and c is a pre - input constant;

[0039] When the road surface undulation Q is large, it means that the vehicle exceeds the height limit to a greater extent compared to when driving on a road surface in the standard state. At this time, the C value is larger, and there is a greater probability that the C value of a vehicle that has not exceeded the height limit is larger than C0, triggering a false alarm. It is necessary to increase the value of C0. At this time, the value of A1 = Q / Q0 × c is large. When the height limit threshold is adjusted to C0 × A1, the value of C0 is increased under the condition of large undulation;

[0040] Similarly, when the undulation is small, the vehicle exceeding C0 is more likely to indicate that its own height is too high. It is necessary to reduce the value of C0 to improve the judgment standard. At this time, the value of A1 = Q / Q0 × c is small. When the height limit threshold is adjusted to C0 × A1, the value of C0 is reduced under the condition of small undulation;

[0041] By enabling the laser detection array 2 to detect the road surface undulation, determining whether the change degree of the undulation compared to the standard undulation exceeds the threshold, and increasing the height limit threshold when the judgment result is yes, the measurement error caused by the undulation is reduced, and the detection accuracy is further improved.

[0042] When the vehicle speed is fast, assuming that the acquisition frequency of the laser detection array 2 for the vehicle remains unchanged, within the same time, the acquisition amount of the data J of the vehicle exceeding the height limit by the laser detection array 2 is low, and the acquisition time needs to be extended. For this reason, the laser detection array 2 is also used to detect the vehicle speed and upload it to the control module 4. The control module 4 is also used to determine whether the vehicle speed exceeds the threshold, and extend the acquisition time when the judgment result is yes;

[0043] Specifically, for each numbered entity, the control module 4 is used to detect the speed v of the vehicle when it enters the detection space. The control module 4 determines whether the overrun coefficient C exceeds the height limit threshold C0, and issues an alarm and raises the height limit rod 12 when it exceeds the threshold, where , A2 = v / v0 × d;

[0044] When the vehicle speed v is large, it means that the acquisition time needs to be extended. At this time, the value of A2 = v / v0 × d is large. When the control module 4 determines whether the overrun coefficient exceeds the height limit threshold C0, the acquisition time is extended when the vehicle speed is large;

[0045] When the vehicle speed v is small, it can be determined whether the vehicle exceeds the height limit threshold within the normal acquisition time, and there is no need to collect a single vehicle for too long a time, reducing the probability of the situation of ignoring other vehicles caused by collecting a single vehicle for too long. At this time, the value of A2 = v / v0 × d is small. When the control module 4 determines whether the overrun coefficient exceeds the height limit threshold C0, the acquisition time is not extended when the vehicle speed is small;

[0046] By enabling the control module 4 to detect the vehicle speed and upload it to the control module 4, and extending the acquisition time when it is determined that the vehicle speed exceeds the threshold result, it avoids the inaccurate acquisition of the J value caused by too high a speed, thereby leading to inaccurate judgment of whether it is too high, and improving the detection accuracy.

[0047] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A laser height limit detection device, characterized in that: It includes a height-limiting frame, on which a height-limiting pole is provided. The height-limiting frame drives the height-limiting pole to move in the vertical direction. A laser detection array is provided on the height-limiting pole. The laser detection array is used to detect the distance by which a vehicle exceeds the restricted height over time in the section to be detected and upload it to the control module. The control module determines whether the cumulative value of the exceeding time and exceeding height of a certain vehicle within the acquisition time exceeds the height-limiting threshold, and issues an alarm and raises the height-limiting pole when the threshold is exceeded; The laser detection array assigns an independent number to each entity in the detection space and distinguishes and detects the exceeding shape and exceeding height of each entity according to the number; The control module collects the distance J by which a certain vehicle exceeds the limit height as time t increases, and plots a curve f(t) of J changing with time t. The control module determines whether the over-limit coefficient C exceeds the height limit threshold C0, and issues an alarm and raises the height limit bar when the threshold is exceeded, where , and T is a pre-input standard acquisition time; The laser detection array is also used to detect the road surface undulation degree and upload it to the control module. The control module determines whether the change degree of the road surface undulation degree compared with the standard undulation degree exceeds the threshold, and increases the height-limiting threshold when the judgment result is yes; The laser detection array is also used to detect the road surface undulation degree Q and upload it to the control module. The control module determines whether the change degree of the road surface undulation degree Q compared with the standard undulation degree Q0 exceeds the threshold, and adjusts the height-limiting threshold to C0×A1, where A1 = Q / Q0×c and c is a pre-input constant; The laser detection array is also used to detect the vehicle speed and upload it to the control module. The control module is also used to determine whether the vehicle speed exceeds the threshold, and extends the acquisition time when the judgment result is yes; The laser detection array is also used to detect the vehicle speed v. The control module determines whether the over-limit coefficient C exceeds the height limit threshold C0, and issues an alarm and raises the height limit bar when the threshold is exceeded, where , A2 = v / v0 × d.

2. The laser height limit detection device according to claim 1, characterized in that: It also includes an input panel, which is used to input the values of T, C0, and Q0.

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