A method of alert blocking

Abstract

The present application belongs to the technical field of highway early warning blocking, and particularly relates to a warning and blocking method. The warning and blocking method comprises the following contents: a first camera and a water curtain imaging unit, the first camera is arranged above the water curtain imaging unit, the first camera performs accident monitoring on a key monitoring road section, the starting point of the key monitoring road section is a highway position corresponding to the water curtain imaging unit, and the ending point of the key monitoring road section is a Y4 position in front of the water curtain imaging unit in the forward direction of the highway; when the first camera monitors that an accident occurs in the key monitoring road section, the water curtain imaging unit perpendicular to the highway is started, a water curtain projection containing warning characters is formed in front of the entering vehicle to perform warning and blocking on the entering vehicle, and the water curtain projection is perpendicular and transverse to the highway. Once an accident occurs in front, the present application can effectively perform warning and blocking on the vehicle on the highway, and greatly reduces the occurrence of subsequent chain accidents.

Description

Technical Field

[0001] This invention belongs to the field of highway early warning and blocking technology, and particularly relates to an early warning and blocking method. Background Technology

[0002] Vehicles travel at high speeds on highways, and traffic volume surges during holidays.

[0003] When an accident occurs on a highway, traffic police cannot immediately reach the scene to conduct an accident investigation and manage traffic. Before the police arrive, vehicles often fail to brake in time, or following vehicles fail to brake because they are unaware of the accident ahead, leading to chain-reaction accidents. Furthermore, accidents occurring inside tunnels on highways frequently result in subsequent chain-reaction accidents.

[0004] While drones can now be used to broadcast warnings and guide traffic after accidents on highways, their effectiveness is limited for vehicles already inside tunnels, and even more so for vehicles with closed windows and using car stereos in the summer. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a warning and blocking method that can effectively warn and block vehicles on the highway once an accident occurs ahead, thereby significantly reducing the occurrence of subsequent chain accidents.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An alarm and blocking method includes the following: a first camera and a water curtain imaging unit. The first camera is positioned above the water curtain imaging unit. The first camera monitors key monitoring road sections for accidents. The starting point of the key monitoring road section is the road location corresponding to the water curtain imaging unit, and the ending point of the key monitoring road section is a position Y4 ahead of the water curtain imaging unit along the road's direction of travel. When the first camera detects an accident in the key monitoring road section, it activates the water curtain imaging unit, which is perpendicular to the road, to form a water curtain projection containing warning characters in front of the approaching vehicle to alarm and block the vehicle. The water curtain projection is vertical and spans across the road.

[0008] Preferably, the water curtain imaging unit includes a spray device, a projection adjustment device, and a water supply device; the spray device is located at the top of the water curtain imaging unit; the water supply device is connected to the spray device through a water pipe; the spray device releases water downwards to form a water curtain; the projection adjustment device includes a projection lamp, a slide rail, and a slide rod, the slide rail is located at the top of the water curtain imaging unit, and the length direction of the slide rail is the same as the length direction of the road; one end of the slide rod is fixedly connected to the projection lamp, and the other end of the slide rod is slidably engaged with the slide rail; the projection lamp is perpendicular to the plane where the water curtain is located, and projects onto the water curtain when it is turned on.

[0009] Preferably, when the water curtain imaging unit is installed on an open road, the water curtain imaging unit also includes a sunshade, and the spray device and projection adjustment device are all installed under the sunshade.

[0010] Preferably, the actual straight-line distance between the projector lamp and the water screen at the next moment is adjusted to... The adjustment method is as follows: calculate the target straight-line distance between the projection lamp and the water curtain at the next moment. :

[0011] ; ;

[0012] Where Φ represents the luminous flux of the projector lamp; k represents the optical efficiency constant; n represents the refractive index of the projector lamp lens; and TR represents the projection ratio of the projector lamp. Indicates the ambient light level on an open-air highway; The projection brightness is represented by α; the ambient light attenuation coefficient is represented by E; the ambient light intensity at the projection lamp is represented by C, which is a preset value; the actual straight-line distance between the projection lamp and the water screen at the current moment is denoted as d; when season ; Indicates the first distance threshold; when At that time, if d, then ;when At that time, if d, then .

[0013] Preferably, when the ambient temperature is below 0 degrees Celsius, the water supply equipment contains a mixture of water and antifreeze; the concentration of antifreeze in the mixture at the next moment is adjusted to... The adjustment method is as follows:

[0014] Calculate the target concentration of antifreeze in the mixture at the next moment using the following formula. :

[0015] ;

[0016] in, T represents the ambient temperature at the current moment. When the ambient temperature is less than 0, T is a negative number. The first parameter; This is the second parameter; It is the third parameter;

[0017] Let N be the actual concentration of antifreeze in the mixture at the current moment;

[0018] when hour, = ;when hour, = That is, increase the antifreeze in the water supply equipment (74) so ​​that the actual concentration of antifreeze in the mixed liquid at the next moment is increased. for .

[0019] Preferably, the spraying device includes a liquid storage pipe and a water column unit; the liquid storage pipe is located at the top of the spraying device, and the bottom of the liquid storage pipe is parallel to the ground; the top of the liquid storage pipe is connected to the water supply equipment through a water pipe; several adjacent and closely arranged water column units are provided at the bottom of the liquid storage pipe; the water column units release water downward to form water columns, and several water columns are closely arranged to form a water curtain.

[0020] Preferably, the water column unit includes, from top to bottom, a pressure regulating valve, a liquid storage box, and a nozzle; each liquid storage box and the liquid storage pipe are connected by a pipe, and a pressure regulating valve is installed on the pipe; several nozzles are installed at the bottom of the liquid storage box.

[0021] Preferably, the bottom of the liquid storage box is provided with three or more rows of nozzles, with adjacent rows of nozzles arranged alternately; with the vehicle's direction of travel as the front-to-back direction, the odd-numbered rows of nozzles are in the same position in the left-to-right direction, and the even-numbered rows of nozzles are in the same position in the left-to-right direction.

[0022] Preferably, the alarm and blocking system also includes a second camera, an information board, a loudspeaker, warning lights, speed limit signs, and an alarm array; the section of road between Y1 and Y2 behind the water curtain imaging unit along the direction of travel is designated as the warning zone, and information boards, loudspeakers, warning lights, and speed limit signs are installed on both sides of the road within the warning zone; the section of road between Y2 and Y3 behind the water curtain imaging unit along the direction of travel is designated as the deceleration zone, and warning lights and speed limit signs are installed on both sides of the road within the deceleration zone; the section of road between Y3 and the water curtain imaging unit along the direction of travel is designated as the parking zone, and an alarm array and loudspeakers are installed on both sides of the road within the parking zone; wherein, 0 < Y3 < Y2 < Y1; the second camera is used to monitor accidents in the parking zone, deceleration zone, and warning zone.

[0023] Preferably, several warning and barrier systems are installed on the highway, with seamless connections between adjacent systems. The end of the key monitoring section in the current warning and barrier system becomes the starting point of the warning zone for the next system. If an accident occurs in the key monitoring section of the current system, it will be detected by the first camera, at which point the current system is activated: the information board in the warning zone explains and plays the location of the accident and the accident situation / image, the loudspeaker broadcasts a speed reduction announcement, the warning lights flash, and the speed limit sign displays the first maximum speed. In the deceleration zone, the warning lights flash, and the speed limit sign displays the second maximum speed. Maximum speed; the alarm array in the parking zone will activate audible and visual alarms, and the loudspeaker will issue a parking warning; the water curtain imaging unit will activate the water curtain and project the word "Stop" onto the water curtain; if the accident occurs in the warning zone, deceleration zone, or parking zone of the current alarm barrier system, it will be detected by the second camera. At this time, the information boards, loudspeakers, warning lights, speed limit signs, and alarm arrays in the warning zone, deceleration zone, or parking zone of the current alarm barrier system will be activated, and at the same time, the information boards, loudspeakers, warning lights, speed limit signs, alarm arrays, and water curtain imaging units in the warning zone, deceleration zone, and parking zone of the previous alarm barrier system will all be activated.

[0024] The beneficial effects of this invention are as follows:

[0025] (1) The alarm and blocking method of the present invention can effectively alarm and block vehicles on the highway once an accident occurs ahead, greatly reducing the occurrence of subsequent chain accidents.

[0026] (2) In one alarm and blocking method of the present invention, the water curtain imaging unit can form a vertical water curtain projection that spans the highway to alarm and block the vehicles entering the road.

[0027] (3) The present invention provides an alarm and blocking method that uses a three-level warning and blocking interval of "warning-deceleration-stop" to effectively block vehicles from entering key monitoring sections from both sides of the road.

[0028] (4) From the moment a vehicle enters the warning zone of the current warning and blocking system, the warning and blocking method of the present invention uses visual and auditory channels to persuade the driver to slow down and stop. Even if the vehicle closes its windows and uses its car audio system, making the auditory persuasion ineffective, the present invention can also use warning lights, alarm arrays, and a water curtain projection set on the road in front of the vehicle's direction of travel to persuade the driver to slow down and stop through a more intuitive visual method. Furthermore, because the water curtain projection is vertical and spans across the road, the driver will definitely see it.

[0029] (5) In the spraying device of the present invention:

[0030] ① The liquid storage pipeline is used to reduce the fluctuation of the liquid reaching the water column unit and to provide a stable liquid to the water column unit.

[0031] ② The pressure regulating valve can make the water released from the nozzle form a stable water column, which makes the water curtain projection effect better and avoids the nozzle releasing intermittent water droplets, thus affecting the clarity of the water curtain projection.

[0032] ③ The nozzle row arrangement at the bottom of the liquid storage box ensures that the nozzles in the odd-numbered rows are substitutes for each other, and the nozzles in the even-numbered rows are also substitutes for each other. This way, even if a nozzle is damaged, there will still be a water column at the corresponding position, ensuring the effect of the water curtain projection.

[0033] (6) By calculating the target straight-line distance between the projection lamp and the water curtain at the next moment and adjusting the actual straight-line distance between the projection lamp and the water curtain at the next moment, this invention can ensure that the alarm blocking system activated at any time can enable the driver to clearly see the water curtain projection at the beginning of the current alarm blocking system, thus ensuring the alarm blocking effect of the alarm blocking system of this invention.

[0034] (7) The method of controlling the concentration of antifreeze in the mixed liquid of the present invention can significantly reduce the amount of antifreeze consumed, ensure that the mixed liquid does not freeze during the formation of the water curtain, ensure the normal use of the water curtain imaging unit in winter, and save costs.

[0035] (8) The shading canopy set in the water curtain imaging unit has the function of shading and rain protection, so that the water curtain imaging unit of the present invention is not limited to use only in tunnels, but can be used normally on open roads, and has extremely strong versatility. Attached Figure Description

[0036] 1. Information board; 2. Loudspeaker; 3. Warning light; 4. Speed ​​limit sign; 5. Alarm array; 61. First camera; 62. Second camera; 7. Water curtain imaging unit; 71. Sprinkler system; 711. Liquid storage pipe; 712. Water column unit; 7121. Pressure transformer valve; 7122. Liquid storage box; 7123. Nozzle; 72. Projection adjustment device; 721. Projection lamp; 722. Slide rail; 723. Slide bar; 73. Sunshade canopy; 74. Water supply equipment;

[0037] Figure 1 This is a schematic diagram of the structure of the water curtain imaging unit of the present invention;

[0038] Figure 2 This is a schematic diagram of the overall structure of the alarm and blocking system of the present invention;

[0039] Figure 3 This is a schematic diagram of the spray device.

[0040] Figure 4 This is a schematic diagram of the projection adjustment device from a top-down perspective.

[0041] Figure 5 for Figure 3 Enlarged view of point A in the middle;

[0042] Figure 6 This is a schematic diagram of the nozzle at the bottom of the liquid storage box. Detailed Implementation

[0043] To make the technical solution of the present invention clearer and more explicit, the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Solutions derived by those skilled in the art through equivalent substitution and conventional reasoning of the technical features of the present invention without creative effort all fall within the protection scope of the present invention.

[0044] The accidents mentioned in this invention refer not only to traffic accidents, but also to natural disasters and construction projects such as road repairs.

[0045] The alarm barrier system can be installed on open roads or inside road tunnels.

[0046] An alarm and blocking method includes the following: a first camera 61 and a water curtain imaging unit 7. The first camera 61 is positioned above the water curtain imaging unit 7. The first camera 61 monitors key monitoring road sections for accidents. The starting point of the key monitoring road section is the road position corresponding to the water curtain imaging unit 7. The ending point of the key monitoring road section is the road position corresponding to the distance Y4 behind the water curtain imaging unit 7, which is the position Y4 ahead of the water curtain imaging unit 7 along the direction of travel of the road. When the first camera 61 detects an accident in the key monitoring road section, it activates the water curtain imaging unit 7, which is perpendicular to the road, to form a water curtain projection containing warning characters in front of the incoming vehicle to alarm and block the vehicle. The water curtain projection is vertical and spans across the road.

[0047] like Figure 2 The diagram shows the overall structure of the alarm and blocking system, including a first camera 61 and a water curtain imaging unit 7. The first camera 61 is positioned above the water curtain imaging unit 7 and performs accident monitoring on key monitoring sections. Entering vehicles will sequentially pass through the start and end points of the key monitoring sections.

[0048] The structure of water curtain imaging unit 7 is as follows Figure 1As shown, it includes a spray device 71, a projection adjustment device 72, and a water supply device 74. The water supply device 74 is connected to the spray device 71 via a water pipe and is used to supply water to the spray device 71. The spray device 71 is located at the top of the water curtain imaging unit 7 and is used to form a water curtain. The projection adjustment device 72 is located at the top of the water curtain imaging unit 7 and is set perpendicular to the water curtain. The projection adjustment device 72 projects onto the water curtain.

[0049] Optionally, the water supply equipment 74 in summer uses tap water or rainwater, while the water supply equipment 74 in winter uses a mixture of water and antifreeze.

[0050] In this invention, the antifreeze is ethylene glycol.

[0051] When the water curtain imaging unit 7 is installed inside the tunnel, the spray device 71 and the projection adjustment device 72 are both located at the top of the tunnel.

[0052] Spraying device 71 Figure 3 As shown, the system includes a liquid storage pipe 711 and water column units 712. The liquid storage pipe 711 is located at the top of the spray device 71, and its bottom is parallel to the ground. One end of the pipe is connected to a water supply device 74, and the other end is connected to the top of the liquid storage pipe 711. Several adjacent and closely arranged water column units 712 are arranged at the bottom of the liquid storage pipe 711. The liquid storage pipe 711 is used to reduce water fluctuations reaching the water column units 712, providing a stable water supply to the water column units 712 and extending their lifespan. The water column units 712 release water columns downwards to form a water curtain.

[0053] The water column unit 712 consists of, from top to bottom, a pressure regulating valve 7121, a liquid storage box 7122, and a nozzle 7123. Each liquid storage box 7122 is connected to a liquid storage pipe 711 via a pipe, on which a pressure regulating valve 7121 is installed to adjust the water column flow rate and water pressure. Several nozzles 7123 are located at the bottom of the liquid storage box 7122.

[0054] The pressure regulator 7121 enables the water released from the nozzle 7123 to form a stable water column, resulting in a better water curtain projection effect and preventing the nozzle 7123 from releasing intermittent water droplets, which would affect the clarity of the water curtain projection.

[0055] Optionally, the bottom of the liquid reservoir 7122 is provided with three or more rows of nozzles 7123. Adjacent rows of nozzles 7123 are arranged alternately; with the vehicle's direction of travel as the front-to-back direction, that is, each nozzle in the next row is positioned in the gap between adjacent nozzles in the previous row. Odd-numbered rows of nozzles are in the same position in the left-to-right direction, and all even-numbered rows of nozzles are in the same position in the left-to-right direction.

[0056] In this embodiment, the bottom of the liquid storage box 7122 is provided with four rows of nozzles 7123, the spacing between adjacent nozzles 7123 in each row is the same, the diameter of the nozzles 7123 is 4mm, and the spacing between adjacent nozzles in the same row is 30mm.

[0057] The nozzle row arrangement at the bottom of the liquid storage box 7122 of this invention allows the nozzles at corresponding positions in odd-numbered rows to substitute for each other, and the nozzles at corresponding positions in even-numbered rows to substitute for each other. In this way, even if a nozzle is damaged, there will still be a water column at the corresponding position, ensuring the effect of water curtain projection.

[0058] The projection adjustment device 72 includes a projection lamp 721, a slide rail 722, and a slide bar 723, such as Figure 4 As shown. A slide rail 722 is fixedly mounted on the top side of the water curtain imaging unit 7, with its length aligned with the length of the road. One end of a slide rod 723 is fixedly connected to the projection lamp 721, and the other end is slidably engaged with the slide rail 722. The slide rod 723 adjusts the actual straight-line distance d between the projection lamp 721 and the water curtain by sliding along the slide rail 722. The adjusted actual straight-line distance d between the projection lamp 721 and the water curtain refers to the shortest straight-line distance between the lamp head of the projection lamp 721 and the plane of the water curtain.

[0059] All other things being equal, changing the actual straight-line distance d will change the size and brightness of the projection on the water screen.

[0060] When the water curtain imaging unit 7 is installed inside the tunnel, the slide rail 722 is fixedly installed on the top side of the tunnel.

[0061] Optionally, the water curtain imaging unit 7 also includes a light-shielding canopy 73. The spray device 71 and the projection adjustment device 72 are both located below the light-shielding canopy 73. Both the spray device 71 and the projection adjustment device 72 are covered by the light-shielding canopy 73.

[0062] The sunshade 73's sunshade and rain protection functions enable the water curtain imaging unit 7 of the present invention to be used not only in tunnels, but also on open roads.

[0063] In this embodiment, the shading canopy 73 includes a steel arch frame, a PC polycarbonate sheet, and a reinforced concrete canopy wall. The PC polycarbonate sheet is fixedly installed on the top of the steel arch frame, and the bottom of the steel arch frame is fixed in the reinforced concrete canopy wall.

[0064] Optionally, one alarm and blocking system of the present invention also includes an information board 1, a loudspeaker 2, a warning light 3, a speed limit sign 4, an alarm array 5, and a second camera 62. The road section between Y1 and Y2 in front of the current water curtain imaging unit 7 is designated as the warning zone of the current alarm and blocking system, which is the road section between Y1 and Y2 behind the current water curtain imaging unit 7 along the road's forward direction. The road section between Y2 and Y3 in front of the current water curtain imaging unit 7 is designated as the deceleration zone of the current alarm and blocking system, which is the road section between Y2 and Y3 behind the current water curtain imaging unit 7 along the road's forward direction. The road section between Y3 in front of the current water curtain imaging unit 7 and the current water curtain imaging unit 7 is designated as the parking zone of the current alarm and blocking system, which is the road section between Y3 behind the current water curtain imaging unit 7 along the road's forward direction and the current water curtain imaging unit 7. Wherein, 0 < Y3 < Y2 < Y1. The second camera 62 performs accident monitoring on the warning zone, deceleration zone, and parking zone of the current alarm and blocking system. Information boards 1, loudspeakers 2, warning lights 3, and speed limit signs 4 are installed on both sides of the road within the warning zone. Warning lights 3 and speed limit signs 4 are installed on both sides of the road within the deceleration zone. Alarm arrays 5 and loudspeakers 2 are installed on both sides of the road within the parking zone.

[0065] All warning lights 3 and alarms in the alarm array 5 within all zones are set at equal intervals.

[0066] Vehicles entering the system sequentially pass through the warning zone, deceleration zone, and stopping zone of the current alarm barrier system. Each alarm barrier system employs a three-level warning and blocking zone system of "warning-deceleration-stop" to prevent vehicles from entering key monitored road sections.

[0067] In summary, the total length of the road segment where each alarm barrier system is located is S = Y1 + Y2 + Y3 + Y4.

[0068] In this embodiment, Y1 = 2 km, Y2 = 1 km, Y3 = 1 km, and Y4 = 2 km; the length of each section is based on the "Safety Operation Procedures for Highway Maintenance" and the "Specifications for Highway Route Design".

[0069] Optionally, several warning and blocking systems can be set up on the highway, with seamless connection between adjacent warning and blocking systems. That is, the highway location corresponding to the end of the current warning and blocking system (i.e. the end point of the key monitoring section in the current warning and blocking system) is the beginning of the next warning and blocking system (i.e. the starting point of the warning zone of the next warning and blocking system).

[0070] The alarm blocking methods of the alarm blocking system on highways are described below:

[0071] If the accident occurs in a key monitoring section of the current alarm and blocking system, it will be detected by the first camera 61. At this time, the current alarm and blocking system is activated: the information board 1 in the warning zone explains and plays the location of the accident and the accident situation / scene; the loudspeaker 2 broadcasts a slowdown warning; the warning light 3 flashes to warn; and the speed limit sign 4 displays the first maximum speed. In the deceleration zone, the warning light 3 flashes to warn; and the speed limit sign 4 displays the second maximum speed. In the stopping zone, the alarm array 5 sounds and lights an alarm; the loudspeaker 2 warns to stop; and the water curtain imaging unit 7 opens the water curtain and projects the word "Stop" onto it. In this way, vehicles entering the warning zone of the current alarm and blocking system are advised to slow down and stop through visual and auditory means. Even if the vehicle closes its windows and uses its car audio system, making the auditory warning ineffective, this invention can also use the warning light 3, the alarm array 5, and the water curtain projection set on the road in front of the vehicle's direction of travel to persuade the vehicle to slow down and stop through a more intuitive visual means. Furthermore, since the accident occurred on a key monitoring section of the current alarm and blocking system, this invention is sufficient to dissuade vehicles from slowing down and stopping before reaching the accident site simply by using the three-level warning and blocking interval of the current alarm and blocking system: "warning-deceleration-stop".

[0072] It should be noted that even if the vehicle has its windows closed and is playing music loudly through its car stereo, and the driver cannot see the flashing lights and audible and visual alarms on the roadside, the driver will still see the water curtain projection spanning the road.

[0073] If the accident occurs within the warning zone, deceleration zone, or stopping zone of the current alarm barrier system, it will be detected by the second camera 62. At this time, the warning zone, deceleration zone, or stopping zone of the current alarm barrier system will be activated, and the previous alarm barrier system will also be activated. The situation within each zone after the activation of each alarm barrier system has been described above and will not be repeated here. Based on the above analysis, in order to ensure that the entering vehicle can see the water curtain projection, this invention also activates the previous alarm barrier system. In this way, the entering vehicle will be advised to slow down and stop when entering the road section of the previous alarm barrier system. Furthermore, the water curtain projection in the previous alarm barrier system will also advise drivers of vehicles with closed windows and using car audio systems to slow down and stop, giving the entering vehicle sufficient time to slow down and stop before reaching the accident point.

[0074] Because some water screen imaging units 7 are used on open roads, although there are light-blocking canopies 73 for shading, the ambient brightness directly affects the image contrast of the water screen projection, which is directly related to the warning effect on drivers. When the brightness of the water screen projection remains constant, the image contrast of the water screen projection is very high at night; however, under clear daylight, the image contrast of the water screen projection drops significantly, and the visual impact on drivers is noticeably less than at night.

[0075] To ensure the warning effect of the water curtain projection, the present invention changes the projection brightness of the water curtain imaging unit 7 by adjusting the actual straight-line distance between the projection lamp 721 and the water curtain in real time, so as to ensure the alarm blocking effect when the alarm blocking system is activated.

[0076] This invention aims to ensure a good warning effect even within the warning zone. Therefore, the technicians conducted experiments under different ambient brightness conditions and set a contrast ratio C. The contrast ratio C ensures that the driver can clearly see the water curtain projection of the current warning and blocking system even at the front end of the current warning and blocking system.

[0077] ; ;

[0078] in, Φ represents the straight-line distance between the projector lamp 721 and the water curtain at the next moment; k represents the optical efficiency constant; n represents the lens refractive index of the projector lamp 721; and TR represents the projection ratio of the projector lamp 721. The ambient light level is measured by an unobstructed light sensor installed on an open road. α represents the projection brightness; α represents the ambient light attenuation coefficient, which is related to the water curtain reflectivity; E is the ambient light intensity at the projection lamp 721, which refers to the ambient light intensity at the location of the projection lamp 721 when the projection lamp 721 is not turned on, and is also collected by the light sensor.

[0079] Let d be the actual straight-line distance between the projector lamp 721 and the water screen at the current moment, and let d be the actual straight-line distance between the projector lamp 721 and the water screen at the next moment. ,but:

[0080] when season ; Indicates the first distance threshold;

[0081] when At that time, if d, then In other words, the actual straight-line distance between the projector 721 and the water curtain remains unchanged at the next moment, allowing the driver to clearly see the water curtain projection of the current alarm barrier system from the front end of the current alarm barrier system; when At that time, if d, then That is, the slider 723 slides on the slide rail 722, so that the actual straight-line distance between the projection lamp 721 and the water screen at the next moment is... Even if the projector lamp 721 is closer to the water screen at the next moment.

[0082] To ensure the projection size and considering the length of the light-blocking shed 73 when the water curtain imaging unit 7 includes it, the upper and lower limits of the actual straight-line distance between the projection lamp 721 and the water curtain are limited. However, since the upper limit of the actual straight-line distance between the projection lamp 721 and the water curtain does not play a significant role in this invention, it will not be elaborated here. Only the lower limit of the actual straight-line distance between the projection lamp 721 and the water curtain has been described above for adjusting the actual straight-line distance between the projection lamp 721 and the water curtain at the next moment. The impact.

[0083] This invention calculates the target straight-line distance between the projection lamp 721 and the water curtain at the next moment and adjusts the actual straight-line distance between the projection lamp 721 and the water curtain accordingly. This ensures that the alarm blocking system activated at any time can allow the driver to clearly see the water curtain projection at the beginning of the current alarm blocking system, thus guaranteeing the alarm blocking effect of the alarm blocking system of this invention.

[0084] Even if the water curtain imaging unit 7 is set inside the tunnel, the ambient brightness will still have the same effect on the image contrast of the water curtain projection of the water curtain imaging unit 7 set at the tunnel entrance. Therefore, the method for adjusting the actual straight-line distance between the projection lamp 721 and the water curtain at the next moment described above is also applicable to the water curtain imaging unit 7 set inside the tunnel.

[0085] To ensure that the use of the water curtain imaging unit 7 is not limited by the season, the present invention adjusts the concentration N of antifreeze in the mixed liquid of the winter water supply equipment 74 in real time:

[0086] When the ambient temperature is below 0 degrees Celsius, the concentration of antifreeze in the mixed liquid of water supply equipment 74 shall be controlled as follows:

[0087] pass Calculate the target concentration of antifreeze in the mixture at the next moment. ;in, T represents the ambient temperature at the current moment. When the ambient temperature is less than 0, T is a negative number. The first parameter; This is the second parameter; This is the third parameter.

[0088] In this embodiment, , , .

[0089] In this embodiment, It was created by technicians based on data of antifreeze concentration in the mixed liquid and ambient temperature.

[0090] Let N be the actual concentration of antifreeze in the mixture at the current moment. Then, let N be the actual concentration of antifreeze in the mixture at the next moment. :when hour, = That is, the actual concentration of antifreeze in the mixture at the next moment is the same as the actual concentration of antifreeze at the current moment; when hour, = This means increasing the antifreeze in the water supply equipment 74 so that the actual concentration of antifreeze in the mixed liquid at the next moment is... .

[0091] The present invention provides a method for controlling the concentration of antifreeze in the mixed liquid of the water supply device 74. This method significantly reduces the amount of antifreeze consumed, ensures that the mixed liquid does not freeze during the formation of the water curtain, guarantees the normal use of the water curtain imaging unit 7 in winter, and saves costs.

[0092] The technologies, shapes, and structures not described in detail in this invention are all well-known technologies. It should also be noted that the above are merely preferred embodiments of this invention and are not intended to limit the scope of the invention. The components or steps in the embodiments of this invention can be decomposed and / or recombined, and these decompositions and / or recombinations should be considered equivalent solutions to this application and should all fall within the protection scope of this invention.

Claims

1. An alarm blocking method, characterized in that, Includes the following: The first camera (61) and the water curtain imaging unit (7) are located above the water curtain imaging unit (7). The first camera (61) monitors the key monitoring road section for accidents. The starting point of the key monitoring road section is the road position corresponding to the water curtain imaging unit (7), and the ending point of the key monitoring road section is the Y4 position in front of the water curtain imaging unit (7) along the road direction. When the first camera (61) detects an accident in the key monitoring section, the water curtain imaging unit (7) perpendicular to the road is activated. A water curtain projection containing warning characters is formed in front of the vehicle to warn and block the vehicle. The water curtain projection is vertical and spans across the road. The water curtain imaging unit (7) includes a spray device (71), a projection adjustment device (72), and a water supply device (74); the spray device (71) is located at the top of the water curtain imaging unit (7); the water supply device (74) is connected to the spray device (71) through a water pipe; the spray device (71) releases water downwards to form a water curtain; the projection adjustment device (72) includes a projection lamp (721), a slide rail (722), and a slide rod (723); the slide rail (722) is located at the top of the water curtain imaging unit (7), and the length direction of the slide rail (722) is the same as the length direction of the road; one end of the slide rod (723) is fixedly connected to the projection lamp (721), and the other end of the slide rod (723) is slidably engaged with the slide rail (722); the projection lamp (721) is perpendicular to the plane where the water curtain is located, and projects onto the water curtain when it is turned on; Adjust the actual straight-line distance between the projector lamp (721) and the water screen at the next moment to be The adjustment method is as follows: Calculate the target straight-line distance between the projection lamp (721) and the water curtain at the next moment. : ； ； Where Φ represents the luminous flux of the projection lamp (721); k represents the optical efficiency constant; n represents the lens refractive index of the projection lamp (721); and TR represents the projection ratio of the projection lamp (721). Indicates the ambient light level on an open-air highway; Indicates the projected brightness; α represents the ambient light attenuation coefficient; E represents the ambient light intensity at the projection lamp (721); C represents the contrast ratio, which is a preset value. Let d be the actual straight-line distance between the projector lamp (721) and the water curtain at the current moment; when season ; Indicates the first distance threshold; when At that time, if d, then ;when At that time, if d, then When the ambient temperature is below 0 degrees Celsius, the water supply equipment (74) contains a mixture of water and antifreeze; the concentration of antifreeze in the mixture at the next moment is adjusted to... The adjustment method is as follows: Calculate the target concentration of antifreeze in the mixture at the next moment using the following formula. : ； in, T represents the ambient temperature at the current moment. When the ambient temperature is less than 0, T is a negative number. The first parameter; The second parameter; It is the third parameter; Let N be the actual concentration of antifreeze in the mixture at the current moment; when hour, = ;when hour, = That is, increase the antifreeze in the water supply equipment (74) so ​​that the actual concentration of antifreeze in the mixed liquid at the next moment is increased. for .

2. The alarm blocking method according to claim 1, characterized in that: When the water curtain imaging unit (7) is set on an open road, the water curtain imaging unit (7) also includes a shade canopy (73), a spray device (71) and a projection adjustment device (72) are all set under the shade canopy (73).

3. The alarm blocking method according to claim 1, characterized in that: The spraying device (71) includes a liquid storage pipe (711) and a water column unit (712); the liquid storage pipe (711) is located at the top of the spraying device (71), and the bottom of the liquid storage pipe (711) is parallel to the ground; the top of the liquid storage pipe (711) is connected to the water supply equipment (74) by a water pipe; several adjacent and closely arranged water column units (712) are provided at the bottom of the liquid storage pipe (711); the water column units (712) release water downward to form a water column, and several water columns are closely arranged to form a water curtain.

4. The alarm blocking method according to claim 3, characterized in that: The water column unit (712) includes, from top to bottom, a pressure regulating valve (7121), a liquid storage box (7122), and a nozzle (7123); each liquid storage box (7122) and the liquid storage pipe (711) are connected by a pipe, and the pressure regulating valve (7121) is installed on the pipe; a number of nozzles (7123) are installed at the bottom of the liquid storage box (7122).

5. The alarm blocking method according to claim 4, characterized in that: The bottom of the liquid storage box (7122) is provided with three or more rows of nozzles (7123), with adjacent rows of nozzles (7123) arranged alternately; with the vehicle's direction of travel as the front and back direction, the odd-numbered rows of nozzles (7123) are in the same position in the left and right directions, and the even-numbered rows of nozzles (7123) are in the same position in the left and right directions.

6. An alarm blocking method according to any one of claims 1-3, characterized in that: The alarm and blocking system also includes a second camera (62), an information board (1), a loudspeaker (2), a warning light (3), a speed limit sign (4), and an alarm array (5); the section of the road between Y1 and Y2 behind the water curtain imaging unit (7) along the direction of travel is designated as the warning section, and information boards (1), loudspeakers (2), warning lights (3), and speed limit signs (4) are installed on both sides of the road within the warning section; the section of the road between Y2 and Y3 behind the water curtain imaging unit (7) along the direction of travel is designated as the deceleration section, and warning lights (3) and speed limit signs (4) are installed on both sides of the road within the deceleration section; the section of the road between Y3 and the water curtain imaging unit (7) along the direction of travel is designated as the parking section, and an alarm array (5) and loudspeakers (2) are installed on both sides of the road within the parking section; where 0 < Y3 < Y2 < Y1; the second camera (62) is used to monitor the parking section, deceleration section, and warning section for accidents.

7. The alarm blocking method according to claim 6, characterized in that: Several warning and barrier systems are set up on the highway, and adjacent warning and barrier systems are seamlessly connected; the end of the key monitoring section in the current warning and barrier system is the starting point of the warning zone of the next warning and barrier system. If the accident occurs at a key monitoring section of the current alarm blocking system, it will be detected by the first camera (61). At this time, the current alarm blocking system will be activated: the information board (1) in the warning zone will explain and play the location of the accident and the accident situation / scene; the loudspeaker (2) will broadcast a deceleration warning; the warning light (3) will flash to warn; and the speed limit sign (4) will display the first maximum speed. The warning light (3) in the deceleration zone will flash to warn; and the speed limit sign (4) will display the second maximum speed. The alarm array (5) in the parking zone will issue an audible and visual alarm; the loudspeaker (2) will issue a parking warning. The water curtain imaging unit (7) will open the water curtain and project the word "stop" onto the water curtain. If the accident occurs in the warning zone, deceleration zone, or parking zone of the current alarm barrier system, it will be detected by the second camera (62). At this time, the information board (1), loudspeaker (2), warning light (3), speed limit sign (4), and alarm array (5) in the warning zone, deceleration zone, or parking zone of the current alarm barrier system will be activated. At the same time, the information board (1), loudspeaker (2), warning light (3), speed limit sign (4), alarm array (5), and water curtain imaging unit (7) in the warning zone, deceleration zone, and parking zone of the previous alarm barrier system will all be activated.

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