Laser height limit detection device

Abstract

The invention relates to a laser height limiting detection device, and belongs to the technical field of height limiting devices, the laser height limiting detection device comprises a height limiting frame, a height limiting rod is arranged on the height limiting frame, the height limiting frame drives the height limiting rod to move in the vertical direction, and a laser detection array is arranged on the height limiting rod. The laser detection array is used for detecting the distance of a vehicle exceeding the height limit along with time in a road section to be detected and uploading the distance to the control module, and the control module judges that the cumulative value of the exceeding time and the exceeding height of a certain vehicle exceeds a height limit threshold value, gives an alarm when the cumulative value exceeds the threshold value, and lifts the height limit rod; the method can cope with fluctuating road conditions and is high in detection accuracy.

Description

Technical Field

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

[0002] With economic development, there are more types of vehicles traveling on roads, such as cars and trucks. When trucks transport special goods or are modified, the vehicle structure is too high. When such vehicles pass through height-restricted sections, such as tunnels or bridge holes, there is a probability that they will collide with the structure above the height-restricted section. Therefore, it is necessary to set a height limit device in front of the height-restricted section to give early warning or restrict the passage of vehicles that are too high, such as a height limit pole.

[0003] In some cases, the over-height vehicle is fast and cannot stop in time before the height limit pole, resulting in a collision between the height limit pole and the over-height vehicle. At this time, the height limit pole needs to play a reminder role when the vehicle is not close, and rise in time when the over-height vehicle approaches quickly. For this reason, Chinese patent CN117671909A discloses a laser height limit detection device and its early warning system, including: a height limit mechanism, a control module, an alarm module and a laser scanner. The control module is connected to the alarm module and the laser scanner in communication. The laser scanner is installed on the side of the height limit mechanism, and the installation height of the laser scanner is used as the height limit to be detected; 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 front. When an obstacle is detected in front, the super-height information is transmitted to the control module in real time; in the process of rotating back and forth to scan the front, the rotation angle of the laser beam is 270 degrees; after receiving the super-height information, the control module processes and analyzes the super-height information to determine whether the super-height vehicle falls within the preset range. If so, the alarm module is controlled to continuously issue an alarm. It can give early warning to drivers who drive vehicles with super-height to avoid unnecessary losses.

[0004] However, in the above scheme, due to the direct nature of the laser, it can only perform height limit detection on objects that are consistent with its own height and do not change in height. For example, when the road section to be detected has slight undulations due to construction errors, or because the road section where height limit detection is required usually has more overheight vehicles passing by, the average weight of overheight vehicles is heavier than that of ordinary vehicles, causing the road section to be detected to deform under pressure and produce slight undulations. When an overheight vehicle that exceeds the height limit to a lesser extent travels on slight undulations, the top of the vehicle will be lower than the detection of the laser height limit device at the low point of the undulating section as the vehicle is in the trough, and no alarm will be triggered. On the contrary, when a vehicle below the height limit is at the apex of the undulating section, the apex of the vehicle will exceed the laser detection, which will trigger an early warning. Therefore, a laser height limit detection device that can cope with the conditions of undulating sections and has high detection accuracy is needed. Summary of the invention

[0005] In order 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 being able to detect undulating road sections and having high detection accuracy.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A laser height limit detection device comprises a height limit frame, on which a height limit pole is arranged, the height limit frame drives the height limit pole to move in a vertical direction, and a laser detection array is arranged on the height limit pole, the laser detection array is used to detect the distance that a vehicle in a road section to be detected exceeds the height limit over time and uploads it to a control module, the control module determines whether the cumulative value of the excess time and excess height of a vehicle within the collection time exceeds the height limit threshold, and issues an alarm when the threshold is exceeded, thereby lifting the height limit pole.

[0007] As a preferred technical solution of the present invention, the control module collects the distance J that a vehicle exceeds the height limit as time t increases, and draws 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 when the threshold is exceeded, and raises the height limit pole, wherein , T is the pre-entered standard acquisition time.

[0008] As a preferred technical solution of the present invention, the laser detection array is also used to detect the road surface undulation and upload it to the control module. The control module determines whether the degree of change of the road surface undulation compared with the standard undulation exceeds a threshold, and increases the height limit threshold when the judgment result is yes.

[0009] As a preferred technical solution of the present invention, the laser detection array is also used to detect the road surface undulation Q and upload it to the control module. The control module determines whether the degree of change of the road surface undulation Q compared with the standard undulation Q0 exceeds the threshold, and adjusts the height limit threshold to C×A1, wherein A1=Q / Q0×c, and c is a pre-input constant.

[0010] 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 a threshold and extend the acquisition time when the judgment result is yes.

[0011] As a preferred technical solution of the present invention, the laser detection array is also used to detect the vehicle speed v, and the control module determines whether the over-limit coefficient C exceeds the height limit threshold C0, and issues an alarm when the threshold is exceeded, and raises the height limit bar, wherein , A2=v / v0×d.

[0012] As a preferred technical solution of the present invention, it also includes an input panel, and the input panel is used to input the values ​​of T, C0 and Q0.

[0013] The beneficial effects of the present invention are: (1) By making the control module determine that the cumulative value of a vehicle's exceeding time and exceeding height exceeds the height limit threshold, that is, judging Whether the height limit threshold C0 is exceeded, and an alarm is issued when the threshold is exceeded, and the height limit bar is raised to warn vehicles with higher heights, while avoiding false alarms when the actual vehicle height is less than the height limit; (2) By using the laser detection array to detect the road surface undulation, it is determined whether the degree of change in the undulation compared to the standard undulation exceeds a threshold value, and the height limit threshold is increased when the judgment result is yes, thereby reducing the measurement error caused by the undulation and further improving the detection accuracy; (3) By enabling the control module to detect the vehicle speed and upload it to the control module, and extending the acquisition time when judging that the vehicle speed exceeds the threshold result, the inaccurate J value acquisition caused by excessive speed is avoided, which in turn leads to inaccurate judgment of whether the speed is too high, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure after the height limiting rod of the present invention is lifted; Figure 3 FIG. 4 is a control loop block diagram of the present invention.

[0016] Description of main component symbols: In the figure: 1. height limit frame; 11. lifting device; 12. height limit pole; 2. laser detection array; 3. alarm; 4. control module. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0018] See also Figure 1-3 A laser height limit detection device comprises a height limit frame 1, a height limit rod 12 is arranged on the height limit frame 1, and the height limit frame 1 drives the height limit rod 12 to move in a vertical direction; Specifically, the height limit frame 1 includes at least two support rods arranged perpendicular to the ground, each support rod is provided with a lifting device 11, the lifting devices 11 on the two support rods can move synchronously along the axial direction of the support rods, and the two ends of the height limit rod 12 are respectively mounted 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 instruct the lifting of the lifting device 11; In some cases, the over-height vehicle is moving at a high speed and cannot stop in front of the height limit pole 12 in time, causing the height limit pole 12 to collide with the over-height vehicle. At this time, the height limit pole 12 needs to play a reminder role when the vehicle is not approaching, and be raised in time when the over-height vehicle is approaching quickly. For this purpose, a laser detection array 2 is provided on the height limit pole 12. The laser detection array 2 is used to detect that the vehicle in the road section to be detected exceeds the limit height over time and uploads it to the control module 4. The control module 4 instructs the lifting device 11 to raise the height limit pole 12 when it is judged necessary; 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 level with the height limit. At this time, the laser detection array 2 detects whether there is an object exceeding the height limit through the distance measurement principle. When an over-high vehicle exceeds the bottom surface of the detection space of the laser detection array 2, the laser detection array 2 detects that there is currently an object exceeding the bottom surface of the detection space, and the laser detection array 2 detects the height of this object exceeding the bottom surface of the detection space over time; When multiple vehicles exceed the height limit at the same time and are detected by the laser detection array 2, it determines which independent entities exist in the detection space by shape scanning. Each independent entity represents a measured vehicle. Then the laser detection array 2 assigns an independent number to each entity in the detection space, and distinguishes the exceeded shape and height of each entity according to the number to avoid interrupting the detection of a certain vehicle. Due to the direct nature of the laser, it can only perform height limit detection on objects that are consistent with its own height and do not change in height. For example, when the road section to be detected has slight undulations due to construction errors, or because the road section where the height limit detection is required usually has more vehicles that are too high passing by, the average weight of the vehicles that are too high is heavier than that of ordinary vehicles, causing the road section to be detected to deform under pressure and produce slight undulations. When a vehicle that exceeds the height limit to a lesser extent travels on the slight undulations, at the low point of the undulating road section, the top will be lower than the detection of the laser height limit device along with the vehicle at the trough, and no alarm will be triggered. On the contrary, when a vehicle that is lower than the height limit is at the top of the undulating road section, the top of the vehicle will exceed the laser detection, which will trigger a false alarm. Therefore, the control module 4 determines that the cumulative value of the excess time and excess height of a certain vehicle within the acquisition time exceeds the height limit threshold, and issues an alarm when the threshold is exceeded, and raises the height limit pole 12; Specifically, the control module 4 collects the distance J that a vehicle exceeds the height limit as time t increases, and draws a 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 when the threshold is exceeded, and raises the height limit rod 12, wherein , T is the pre-entered standard acquisition time; The control module 4 files each numbered entity's distance J exceeding the height limit each time it receives the distance J, and then draws a 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; is the integral of the curve f(t) of J changing with time t during the collection time, representing the total distance exceeding the height limit accumulated during the detection time. When a vehicle is at a high height, when it is driving on an undulating road section, the part of the height exceeding the height limit is large, and the total distance exceeding the height limit accumulated during the detection time is large. Since the road section requiring height limit often does not support slow driving or long-term parking of vehicles, the integral value is large. When it exceeds a certain value, there is a high probability that it is caused by the high height. Therefore, at this time, the control module 4 issues an alarm through the alarm 3 to lift the height limit pole 12; Similarly, when C is small, it means that although a certain vehicle partially exceeds the height limit during driving, the degree of exceeding is small. Therefore, there is a high probability that the height limit is only temporarily exceeded at a high altitude due to the undulating road 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 triggering false alarms caused by the undulating road section. At the same time, by calculating the integral of the curve f(t) of J changing with time t during the acquisition time, and counting the total height of each vehicle exceeding the height limit over time, the recording error of the exceeding distance caused by factors such as the shaking of the situation of a certain vehicle can be avoided. For example, when the suspension damping of a certain vehicle is low, it will vibrate up and down continuously when driving on an undulating road section, and the vibration can be regarded as a sinusoidal fluctuation around a certain value over time, which is reflected in the detection result of the laser detection array 2, that is, the distance J exceeding the height limit will continuously fluctuate sinusoidally around a certain value. If the J value is detected discretely, it is difficult to offset the error caused by the continuous vibration. , the J value at any time during the continuous vibration process can be included in the calculation, and because the J fluctuation is around a certain value, the value after including the J value at any time during the whole process into the calculation is close to the value without fluctuation, which further improves the recording accuracy compared with discrete records; By making the control module 4 determine that the cumulative value of the exceeding time and the exceeding height of a certain vehicle exceeds the height limit threshold, that is, determining Whether it exceeds the height limit threshold C0, and when it exceeds the threshold, an alarm is issued, and the height limit rod 12 is raised to warn vehicles with higher vehicle heights, while avoiding false alarms when the actual vehicle height is less than the height limit.

[0019] In the above scheme, the heights of the valleys and peaks of different undulating sections are different. Since the causes of the undulating sections include excessively high vehicles with a weight exceeding the average that exert pressure on the section to be detected for a long time, thereby causing slight undulations, the degree of undulation of the undulating section will change as the undulating section is used. As the degree of undulation changes, the height J of the vehicle exceeding the height limit will also change, thereby causing the C value calculated for each vehicle to change. There is a probability that the C value does not exceed C0 in a certain state of the undulating section, but exceeds C0 in the next state, affecting the detection accuracy. For this reason, the laser detection array 2 is also used to detect the undulation of the road surface and upload it to the control module 4. The control module 4 determines whether the degree of change of the road surface undulation compared with the standard undulation exceeds the threshold, and increases the height limit threshold when the judgment result is yes. Specifically, the laser detection array 2 has a laser detector specifically used for mapping the road section to be detected. The laser detection array 2 is used to detect the road surface undulation Q and upload it to the control module 4. The control module 4 determines whether the degree of change of the road surface undulation Q compared with the standard undulation Q0 exceeds the threshold value, and adjusts the height limit threshold value to C×A1, where A1=Q / Q0×c, and c is a pre-input constant; When the road surface undulation Q is large, it means that the vehicle exceeds the height limit to a greater extent than when driving on a standard road surface. At this time, the C value is larger. There is a high probability that the C value of the vehicle that does not exceed the height limit is larger than C0, triggering a false alarm. The value of C0 needs to be increased. At this time, the value of A1=Q / Q0×c is large. When the height limit threshold is adjusted to C×A1, the value of C0 is increased when the undulation is large. Similarly, when the undulation is small, the vehicle has a greater probability of exceeding C0, which means that its 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 C×A1, the value of C0 is reduced when the undulation is small. By using the laser detection array 2 to detect the road surface undulation, it is determined whether the degree of change in the undulation compared to the standard undulation exceeds a threshold value, and the height limit threshold is increased when the judgment result is yes, thereby reducing the measurement error caused by the undulation and further improving the detection accuracy.

[0020] When the vehicle speed is high, assuming that the laser detection array 2 does not collect data on the vehicle at a constant frequency, the laser detection array 2 collects less data J on the vehicle exceeding the height limit in the same period of time, and the collection 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 collection time if the determination result is yes. Specifically, the control module 4 is used to detect the speed v of the vehicle when it enters the detection space for each numbered entity. The control module 4 determines whether the over-limit coefficient C exceeds the height limit threshold C0, and issues an alarm when the threshold is exceeded, and raises the height limit rod 12, wherein , A2=v / v0×d; 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 the over-limit coefficient When the height limit threshold C0 is exceeded, the collection time is extended when the vehicle speed is high; When the vehicle speed v is small, it can be determined whether the vehicle exceeds the height limit threshold within the normal collection time, and there is no need to collect data for a single vehicle for too long, which reduces the probability of ignoring other vehicles due to too long collection time for a single vehicle. At this time, the value of A2=v / v0×d is small. When the control module 4 determines the over-limit coefficient When the height limit threshold C0 is exceeded, the collection time is not extended when the vehicle speed is low; 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, inaccurate J value acquisition caused by excessive speed is avoided, which in turn leads to inaccurate judgment of whether it is too high, thereby improving the detection accuracy.

[0021] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still 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 limit frame, on which a height limit pole is arranged, and the height limit frame drives the height limit pole to move in a vertical direction. A laser detection array is arranged on the height limit pole, and the laser detection array is used to detect the distance that a vehicle in a road section to be detected exceeds the height limit over time and uploads it to a control module. The control module determines whether the cumulative value of the excess time and excess height of a certain vehicle within the collection time exceeds the height limit threshold, and issues an alarm when the threshold is exceeded, and lifts the height limit pole.

2. A laser height limit detection device according to claim 1, characterized in that: The control module collects the distance J that a vehicle exceeds the height limit as time t increases, and draws 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 when the threshold is exceeded, raising the height limit pole, wherein , T is the pre-entered standard acquisition time.

3. A laser height limit detection device according to claim 2, characterized in that: The laser detection array is also used to detect the road surface undulation and upload it to the control module. The control module determines whether the degree of change of the road surface undulation compared with the standard undulation exceeds a threshold value, and increases the height limit threshold when the judgment result is yes.

4. A laser height limit detection device according to claim 3, characterized in that: The laser detection array is also used to detect the road surface undulation Q and upload it to the control module. The control module determines whether the degree of change of the road surface undulation Q compared with the standard undulation Q0 exceeds the threshold, and adjusts the height limit threshold to C×A1, where A1=Q / Q0×c, and c is a pre-input constant.

5. A laser height limit detection device according to claim 2, characterized in that: 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 a threshold and extend the acquisition time if the determination result is yes.

6. A laser height limit detection device according to claim 2, characterized in that: The laser detection array is also used to detect the vehicle speed v, and the control module determines whether the over-limit coefficient C exceeds the height limit threshold C0, and issues an alarm when the threshold is exceeded, and raises the height limit bar, wherein , A2=v / v0×d.

7. A laser height limit detection device according to claim 1, characterized in that: An input panel is also included, and the input panel is used to enter the values ​​of T, C0 and Q0.

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