CN112185130A - Highway dangerous vehicle distance early warning system and method based on geomagnetic detector - Google Patents
Highway dangerous vehicle distance early warning system and method based on geomagnetic detector Download PDFInfo
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- CN112185130A CN112185130A CN202011112451.6A CN202011112451A CN112185130A CN 112185130 A CN112185130 A CN 112185130A CN 202011112451 A CN202011112451 A CN 202011112451A CN 112185130 A CN112185130 A CN 112185130A
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- G08G1/00—Traffic control systems for road vehicles
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- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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- G—PHYSICS
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
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Abstract
The invention discloses a highway dangerous vehicle distance early warning system based on a geomagnetic detector, which comprises a first section detection system, a second section detection system, a data transmission system, a data processing system, a controller and an early warning information display system. The invention also discloses a highway dangerous vehicle distance early warning method based on the system, which comprises the steps of calculating the vehicle distance between two adjacent vehicles after vehicle data are obtained through a geomagnetic detector, judging whether the vehicle distance meets the requirement of safe vehicle distance, and if not, sending early warning information to prompt a driver to decelerate. According to the invention, the geomagnetic detector is adopted to obtain vehicle data, the distance between the front and rear adjacent vehicles can be calculated through a simple formula, the required equipment is simple, the algorithm is simple, the operation is reliable, and the detection result is not easily influenced by weather; the geomagnetic equipment is convenient to maintain, and has small influence on normal traffic of vehicles.
Description
Technical Field
The invention relates to the technical field of traffic safety, in particular to a dangerous vehicle distance early warning system and method for a long straight line section of an expressway based on a geomagnetic detector.
Background
With the acceleration of the urbanization process and the continuous promotion of the motor vehicle reserves, the expressway is used as an intercity linkage backbone road and plays an irreplaceable role in the development of cities. The highway is different from the urban road in speed, more trucks and large flow, and particularly, a plurality of long straight line sections exist, so that vehicle rear-end collision accidents caused by too short inter-vehicle distance can frequently occur on the highway. The long straight line section of the expressway has a certain gradient due to long section and monotonous line shape, so that under the condition of high speed, the linear condition of the straight line section makes a driver easily feel visual fatigue and generate improper operations such as fatigue driving, and the like, thereby easily causing the traffic accidents of vehicles in front of rear-end collision caused by the fact that the vehicles swing left and right, the speed is too high and the inter-vehicle distance is too short, causing casualties and road property loss.
At present, most of prevention and control methods for too short distance between vehicles on the highway are in a passive prevention and control stage, and the drivers are passively reminded through video snapshot and warning signs, so that the generated effect is not great. For dangerous vehicle distance detection, a small number of vehicles are provided with ranging detectors such as laser radars and the like, so that the vehicle distance detection effect is achieved, and most of vehicles are not equipped and cannot effectively detect the safety distance between the vehicles and the front vehicle. Therefore, a dangerous distance early warning system and a dangerous distance early warning method for a highway straight line section are urgently needed, the dangerous distance of vehicles is effectively detected, early warning information is sent out when the dangerous distance between two adjacent vehicles occurs, a driver is timely informed of taking a deceleration measure, and rear-end collision accidents are avoided.
Disclosure of Invention
In view of the above, the present invention provides a system and a method for highway dangerous distance early warning based on a geomagnetic detector.
The purpose of the invention is realized by the following technical scheme:
the invention provides a highway dangerous vehicle distance early warning system based on a geomagnetic detector, which comprises a first section detection system, a second section detection system, a data transmission system, a data processing system, a controller and an early warning information display system, wherein the first section detection system is used for detecting a first section of a highway;
the second section detection system is arranged on one side of the first section detection system along the advancing direction of the vehicle, and the second section detection system and the first section detection system are positioned on the same lane; the distance between the second section detection system and the first section detection system is defined as a safe vehicle distance, and the safe vehicle distance is determined according to the speed limit value of the road section and the national traffic regulations;
the first section detection system and the second section detection system are respectively connected with the data transmission system in a wireless communication mode;
the data transmission system is connected with the data processing system in a wired mode;
the data processing system is connected with the controller in a wired mode;
the controller is connected with the early warning information display system in a wired mode;
the first section detection system and the second section detection system transmit detected vehicle data of the front vehicle and the rear vehicle to the data transmission system, the data transmission system transmits the vehicle data to the data processing system, the data processing system analyzes and processes the vehicle data and then transmits a processing result to the controller, and the controller controls the work of the early warning information display system according to the processing result; if the actual distance between the front vehicle and the rear vehicle is smaller than the safe distance, the early warning information display system displays early warning information to remind a driver of decelerating; if the actual distance between the front vehicle and the rear vehicle is larger than or equal to the safe distance, the early warning information display system does not display any information;
the first section detection system comprises a first geomagnetic detector and a second geomagnetic detector, and the distance between the first geomagnetic detector and the second geomagnetic detector is 8-10 meters; the second section detecting system comprises a third geomagnetic detector and a fourth geomagnetic detector, and the distance between the third geomagnetic detector and the fourth geomagnetic detector is 8-10 meters.
Further, the data transmission system comprises a repeater and a receiver; the relay receives the vehicle data detected by the first section detection system and the second section detection system and transmits the vehicle data to the receiver in a wireless communication mode.
Further, the data processing system includes a data processor and a structured data processor; the receiver is connected with the data processor by a wire; the data processor is connected with the structured data processor through a network cable; the structured data processor is connected with the controller by a lead.
Further, the early warning information display system comprises a video detector and a VMS sign board, and the controller is connected with the video detector and the VMS sign board through leads.
Further, the video detector is installed 5 meters ahead of the driving direction of the second detection section system.
Further, the VMS sign is installed 50 meters ahead of the driving direction of the second section detection system.
The invention also provides a highway dangerous vehicle distance early warning method based on the system, which comprises the following steps:
step 1: utilize first earth magnetism detector, second earth magnetism detector to acquire preceding car and back car through the time of first, earth magnetism detector, write as: t is t1a、t2a、t1b、t2b(ii) a Wherein the content of the first and second substances,
t1athe time when the rear vehicle passes through the first geomagnetic detector;
t2athe time when the rear vehicle passes through the second geomagnetic detector;
t1bthe time when the front vehicle passes through the first geomagnetic detector is obtained;
t2bthe time when the front vehicle passes through the second geomagnetic detector;
step 2: calculating the distance between the front vehicle and the rear vehicle when the front vehicle passes through the first detection section according to the four time data extracted in the step 1 and the distance between the first geomagnetic detector and the second geomagnetic detector, and recording the distance as dIThen spaced from the safe vehicle by a distance dAnComparison, if the vehicle distance dIIf the distance is smaller than the safe distance, the early warning information is displayedThe display system displays the early warning information of too short distance if the distance dIThe distance is larger than or equal to the safe distance, and the vehicle safely passes through the first detection section;
and step 3: utilize third earth magnetism detector, fourth earth magnetism detector to acquire the time when preceding car and back car pass through third, fourth earth magnetism detector, record as: t is t3a、t4a、t3b、t4b(ii) a Wherein the content of the first and second substances,
t3athe time when the rear vehicle passes through the third geomagnetic detector;
t4athe time when the rear vehicle passes through the fourth geomagnetic detector;
t3bthe time when the preceding vehicle passes through the third geomagnetic detector;
t4bthe time when the preceding vehicle passes through the fourth geomagnetic detector;
and 4, step 4: calculating the distance between the front and rear adjacent two rear vehicles passing through the second detection section according to the four time data extracted in the step 3 and the distance between the third geomagnetic detector and the fourth geomagnetic detector, and recording the distance as dIIAnd a safe distance d from the vehicleAnComparison, if the vehicle distance dIΙIf the distance is smaller than the safe distance, the early warning information display system displays the early warning information that the distance is too short, and if the distance d is smaller than the safe distanceIIAnd if the distance is larger than or equal to the safe distance, the vehicle safely passes through the detection area.
Further, the vehicle distance d in the step 2IThe calculation formula of (2) is as follows:
dI＝(tIa-tIb)·vIa
wherein, tIaIs the time when the rear vehicle passes through the first detection section, the expression is as follows:
tIbis the time when the leading car passes through the first detection section, and the expression is as follows:
vIais the speed of the rear vehicle when passing through the first detection section, and the expression is as follows:
Further, the inter-vehicle distance d in the step 4IIThe calculation formula of (2) is as follows:
dΙΙ＝(tΙΙa-tΙΙb)·vΙΙb
wherein, tΙΙaIs the time when the rear vehicle passes through the second detection section, the expression is as follows:
tΙΙbis the time when the preceding vehicle passes through the second detection section, and the expression is as follows:
vΙΙbis the speed when the front vehicle passes through the 2 nd detection section, and the expression is as follows:
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the invention, the geomagnetic detector is adopted to obtain vehicle data, the distance between the front and rear adjacent vehicles can be calculated through a simple formula, the required equipment is simple, the algorithm is simple, the operation is reliable, and the detection result is not easily influenced by weather; the geomagnetic equipment is convenient to maintain, and has small influence on normal traffic of vehicles.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
The drawings of the present invention are described below.
FIG. 1 is a diagram of an early warning system;
FIG. 2 is a flow chart of an early warning method;
fig. 3 and 4 are schematic diagrams of the simulation detection process of the present invention.
Detailed Description
In order to make the technical solutions, advantages and objects of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the present application.
The invention is further illustrated by the following figures and examples.
Example 1
As shown in fig. 1, the embodiment provides a highway dangerous vehicle distance early warning system based on a geomagnetic detector, which includes a first section detection system, a second section detection system, a data transmission system, a data processing system, a controller and an early warning information display system;
the second section detection system is arranged on one side of the first section detection system along the advancing direction of the vehicle, and the second section detection system and the first section detection system are positioned on the same lane; the distance between the second section detection system and the first section detection system is defined as a safe vehicle distance, and the safe vehicle distance is determined according to the speed limit value of the road section and the national traffic regulations;
the first section detection system and the second section detection system are respectively connected with the data transmission system in a wireless communication mode;
the data transmission system is connected with the data processing system in a wired mode;
the data processing system is connected with the controller in a wired mode;
the controller is connected with the early warning information display system in a wired mode;
the first section detection system and the second section detection system transmit detected vehicle data of the front vehicle and the rear vehicle to the data transmission system, the data transmission system transmits the vehicle data to the data processing system, the data processing system analyzes and processes the vehicle data and then transmits a processing result to the controller, and the controller controls the work of the early warning information display system according to the processing result; if the actual distance between the front vehicle and the rear vehicle is smaller than the safe distance, the early warning information display system displays early warning information to remind a driver of decelerating; if the actual distance between the front vehicle and the rear vehicle is larger than or equal to the safe distance, the early warning information display system does not display any information;
the first section detection system comprises a first geomagnetic detector and a second geomagnetic detector, and the distance between the first geomagnetic detector and the second geomagnetic detector is 8-10 meters; the second section detecting system comprises a third geomagnetic detector and a fourth geomagnetic detector, and the distance between the third geomagnetic detector and the fourth geomagnetic detector is 8-10 meters.
In this embodiment, the data transmission system includes a repeater and a receiver; the relay receives the vehicle data detected by the first section detection system and the second section detection system and transmits the vehicle data to the receiver in a wireless communication mode.
In this embodiment, a data processing system includes a data processor and a structured data processor; the receiver is connected with the data processor by a lead; the data processor is connected with the structured data processor by a network cable; the structured data processor is connected with the controller by a wire.
In this embodiment, the warning information display system includes a video detector and a VMS signboard, and the controller is connected to the video detector and the VMS signboard by wires. When the VMS signboard displays early warning information, the LED screen displays the character of 'too short distance between vehicles and paying attention to deceleration', and reminds a driver to decelerate and enlarge the distance between vehicles, and when no early warning exists, the LED screen of the VMS signboard displays a complete black state.
In this embodiment, the video detector is installed 5 meters ahead of the traveling direction of the second detection cross section system.
In this embodiment, the VMS signboard is installed 50 meters ahead of the traveling direction of the second cross-section detection system.
According to the early warning method flow chart of fig. 2 and the simulation detection process schematic diagrams of fig. 3 and fig. 4, a geomagnetic detector is installed at a 93KM +000M high-speed rectangular line section around the city at Chongqing according to the requirements of the invention, and the highway dangerous vehicle distance early warning method based on the system comprises the following steps:
step 1: utilize first earth magnetism detector, second earth magnetism detector to acquire preceding car and back car through the time of first, earth magnetism detector, write as: t is t1a、t2a、t1b、t2b(ii) a Wherein the content of the first and second substances,
t1athe time when the rear vehicle passes through the first geomagnetic detector;
t2athe time when the rear vehicle passes through the second geomagnetic detector;
t1bthe time when the front vehicle passes through the first geomagnetic detector is obtained;
t2bthe time when the front vehicle passes through the second geomagnetic detector;
step 2: calculating the distance between the front vehicle and the rear vehicle when the front vehicle passes through the first detection section according to the four time data extracted in the step 1 and the distance between the first geomagnetic detector and the second geomagnetic detector, and recording the distance as dΙThen spaced from the safe vehicle by a distance dAnComparison, if the vehicle distance dΙIf the distance is smaller than the safe distance, the early warning information display system displays the early warning information that the distance is too short, and if the distance d is smaller than the safe distanceΙThe distance is larger than or equal to the safe distance, and the vehicle safely passes through the first detection section;
and step 3: front vehicle obtained by using third geomagnetic detector and fourth geomagnetic detectorAnd the time when the rear vehicle passes through the third geomagnetic detector and the fourth geomagnetic detector is recorded as: t is t3a、t4a、t3b、t4b(ii) a Wherein the content of the first and second substances,
t3athe time when the rear vehicle passes through the third geomagnetic detector;
t4athe time when the rear vehicle passes through the fourth geomagnetic detector;
t3bthe time when the preceding vehicle passes through the third geomagnetic detector;
t4bthe time when the preceding vehicle passes through the fourth geomagnetic detector;
and 4, step 4: calculating the distance between the front and rear adjacent two rear vehicles passing through the second detection section according to the four time data extracted in the step 3 and the distance between the third geomagnetic detector and the fourth geomagnetic detector, and recording the distance as dΙΙAnd a safe distance d from the vehicleAnComparison, if the vehicle distance dΙΙIf the distance is smaller than the safe distance, the early warning information display system displays the early warning information that the distance is too short, and if the distance d is smaller than the safe distanceΙΙAnd if the distance is larger than or equal to the safe distance, the vehicle safely passes through the detection area.
In this embodiment, the distance d between vehicles in step 2ΙThe calculation formula of (2) is as follows:
dΙ＝(tΙa-tΙb)·vΙa
wherein, tΙaIs the time when the rear vehicle passes through the first detection section, the expression is as follows:
tΙbis the time when the leading car passes through the first detection section, and the expression is as follows:
vΙais the speed of the rear vehicle when passing through the first detection section, and the expression is as follows:
In this embodiment, the inter-vehicle distance d in step 4ΙΙThe calculation formula of (2) is as follows:
dΙΙ＝(tΙΙa-tΙΙb)·vΙΙb
wherein, tΙΙaIs the time when the rear vehicle passes through the second detection section, the expression is as follows:
tΙΙbis the time when the preceding vehicle passes through the second detection section, and the expression is as follows:
vΙΙbis the speed when the front vehicle passes through the 2 nd detection section, and the expression is as follows:
The calculation of d in step 2ΙThe corresponding model of (a) is: dΙ＝(tΙa-tΙb)·vΙa，dΙ＞dAnWhen the vehicle passes through the detection section 1 safely, the VMS sign board LED screen displays the complete black state, dΙ＜dAnWhen the vehicle is in a short distance, the video detector is used for capturing, the VMS sign plate LED screen displays the character of 'too short distance between vehicles and paying attention to deceleration', and a driver is reminded to decelerate and enlarge the distance between vehicles;
calculation of d in step 4ΙΙThe corresponding model of (a) is: dΙΙ＝(tΙΙa-tΙΙb)·vΙΙb，dΙΙ＞dAnSafety device for vehicleOver-detection road section, MS signpost LED screen displaying full black state, dIΙ＜dAnAnd when the video detector is used for capturing, the VMS sign board LED screen displays the character of 'too short distance between vehicles and paying attention to deceleration', and the driver is reminded to decelerate and enlarge the distance between vehicles.
In this embodiment, the actual data is obtained at the actual test site, where the distance between the first detector and the second detector and the distance between the third detector and the fourth detector are both 10m, i.e. d12＝d34The safety distance between the first detection section and the second detection section is 10m, and the limit value is 50m, namely dAn＝50m。
Analyzing the geomagnetic collected data, the time t when the front vehicle passes through the first geomagnetic detector1bTime t when the preceding vehicle passes through the second geomagnetic detector is 9:10:15 (i.e., nine points and ten-fifteen seconds)2bWhen the vehicle passes the first geomagnetic detector, t is 9:10:15.4 (i.e., nine tenths of fifteen seconds), the time for the rear vehicle to pass the first geomagnetic detector is t1aThe time when the rear vehicle passes the second geomagnetic detector is t, which is 9:10:18 (i.e. nine ten eighteen seconds)2a9:10:18.4 (i.e., nine tenths of eighteen seconds). For this purpose, the time for the leading vehicle to pass through the first detection cross-section is calculated according to the formula described above
The time when the rear vehicle passes through the first detection section is
Speed of rear vehicle passing through first detection section
Calculating the distance d between the two vehicles on the first detection sectionΙ＝(tΙa-tΙb)·vΙa＝75m＞dAnWhen the distance is 50m, the rear vehicle safely passes through the detection section 1.
The two vehicles continue to run, the front vehicle passes through the time t of the third detection section3bWhen the preceding vehicle passes through the fourth detection cross section, t is 9:10:17 (i.e., nine points and seventeen seconds)4b9:10:17.6 (i.e. nine)Seventeen ten minutes and six seconds), the time for the rear car to pass through the third detection section is t3aWhen the time for the rear vehicle to pass through the fourth detection cross section is t, the ratio is 9:10:19 (namely, nine points and nineteen seconds)4a9:10:19.8 (i.e., nine and ten nineteen and eight seconds). For this purpose, the time for the leading vehicle to pass the second detection cross-section is calculated according to the formula described above
The time when the rear vehicle passes through the second detection section is
Speed of front vehicle passing through second detection section
Calculating the distance d between the two vehicles on the second detection sectionΙΙ＝(tΙΙa-tΙΙb)·vΙΙb＝35m＜dAnWhen the distance between the two vehicles on the second detection section is smaller than the safe distance, the video detector takes a snapshot, the variable information mark starts to send out early warning information, and the rear vehicle distance is short after reminding, so that the vehicle is decelerated.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered in the protection scope of the present invention.
Claims (9)
1. The utility model provides a highway dangerous vehicle distance early warning system based on earth magnetism detector which characterized in that: the device comprises a first section detection system, a second section detection system, a data transmission system, a data processing system, a controller and an early warning information display system;
the second section detection system is arranged on one side of the first section detection system along the advancing direction of the vehicle, and the second section detection system and the first section detection system are positioned on the same lane; the distance between the second section detection system and the first section detection system is defined as a safe vehicle distance, and the safe vehicle distance is determined according to the speed limit value of the road section and the national traffic regulations;
the first section detection system and the second section detection system are respectively connected with the data transmission system in a wireless communication mode;
the data transmission system is connected with the data processing system in a wired mode;
the data processing system is connected with the controller in a wired mode;
the controller is connected with the early warning information display system in a wired mode;
the first section detection system and the second section detection system transmit detected vehicle data of the front vehicle and the rear vehicle to the data transmission system, the data transmission system transmits the vehicle data to the data processing system, the data processing system analyzes and processes the vehicle data and then transmits a processing result to the controller, and the controller controls the work of the early warning information display system according to the processing result; if the actual distance between the front vehicle and the rear vehicle is smaller than the safe distance, the early warning information display system displays early warning information to remind a driver of decelerating; if the actual distance between the front vehicle and the rear vehicle is larger than or equal to the safe distance, the early warning information display system does not display any information;
the first section detection system comprises a first geomagnetic detector and a second geomagnetic detector, and the distance between the first geomagnetic detector and the second geomagnetic detector is 8-10 meters; the second section detecting system comprises a third geomagnetic detector and a fourth geomagnetic detector, and the distance between the third geomagnetic detector and the fourth geomagnetic detector is 8-10 meters.
2. The system of claim 1, wherein the early warning system of dangerous distance between vehicles on expressway based on geomagnetic detector comprises: the data transmission system comprises a repeater and a receiver; the relay receives the vehicle data detected by the first section detection system and the second section detection system and transmits the vehicle data to the receiver in a wireless communication mode.
3. The system of claim 2, wherein the early warning system of dangerous distance between vehicles on expressway based on geomagnetic detector is characterized in that: the data processing system comprises a data processor and a structured data processor; the receiver is connected with the data processor by a wire; the data processor is connected with the structured data processor through a network cable; the structured data processor is connected with the controller by a lead.
4. The system of claim 1, wherein the early warning system of dangerous distance between vehicles on expressway based on geomagnetic detector comprises: the early warning information display system comprises a video detector and a VMS sign board, and the controller, the video detector and the VMS sign board are connected through leads.
5. The system of claim 4, wherein the early warning system of dangerous distance between vehicles on expressway based on geomagnetic detector comprises: the video detector is arranged 5 meters ahead of the driving direction of the second detection section system.
6. The system of claim 4, wherein the early warning system of dangerous distance between vehicles on expressway based on geomagnetic detector comprises: and the VMS sign board is arranged 50 meters in front of the driving direction of the second section detection system.
7. An expressway dangerous vehicle distance early warning method based on any one of claims 1 to 6, characterized by comprising the following steps:
step 1: utilize first earth magnetism detector, second earth magnetism detector to acquire preceding car and back car through the time of first, earth magnetism detector, write as: t is t1a、t2a、t1b、t2b(ii) a Wherein the content of the first and second substances,
t1athe time when the rear vehicle passes through the first geomagnetic detector;
t2athe time when the rear vehicle passes through the second geomagnetic detector;
t1bthe time when the front vehicle passes through the first geomagnetic detector is obtained;
t2bthe time when the front vehicle passes through the second geomagnetic detector;
step 2: calculating the distance between the front vehicle and the rear vehicle when the front vehicle passes through the first detection section according to the four time data extracted in the step 1 and the distance between the first geomagnetic detector and the second geomagnetic detector, and recording the distance as dIThen spaced from the safe vehicle by a distance dAnComparison, if the vehicle distance dIIf the distance is smaller than the safe distance, the early warning information display system displays the early warning information that the distance is too short, and if the distance d is smaller than the safe distanceIThe distance is larger than or equal to the safe distance, and the vehicle safely passes through the first detection section;
and step 3: utilize third earth magnetism detector, fourth earth magnetism detector to acquire the time when preceding car and back car pass through third, fourth earth magnetism detector, record as: t is t3a、t4a、t3b、t4b(ii) a Wherein the content of the first and second substances,
t3athe time when the rear vehicle passes through the third geomagnetic detector;
t4athe time when the rear vehicle passes through the fourth geomagnetic detector;
t3bthe time when the preceding vehicle passes through the third geomagnetic detector;
t4bthe time when the preceding vehicle passes through the fourth geomagnetic detector;
and 4, step 4: calculating the distance between the front and rear adjacent two rear vehicles passing through the second detection section according to the four time data extracted in the step 3 and the distance between the third geomagnetic detector and the fourth geomagnetic detector, and recording the distance as dΙIAnd a safe distance d from the vehicleAnComparison, if the vehicle distance dIIIf the distance is smaller than the safe distance, the early warning information display system displays the early warning information that the distance is too short, and if the distance d is smaller than the safe distanceIIAnd if the distance is larger than or equal to the safe distance, the vehicle safely passes through the detection area.
8. The highway dangerous vehicle distance early warning method according to claim 7, wherein: the vehicle distance d in the step 2IThe calculation formula of (2) is as follows:
dI＝(tIa-tIb)·vIa
wherein, tIaIs the time when the rear vehicle passes through the first detection section, the expression is as follows:
tIbis the time when the leading car passes through the first detection section, and the expression is as follows:
vIais the speed of the rear vehicle when passing through the first detection section, and the expression is as follows:
9. The highway dangerous vehicle distance early warning method according to claim 7, wherein: the inter-vehicle distance d in the step 4IIThe calculation formula of (2) is as follows:
dII＝(tIΙa-tΙΙb)·vΙIb
wherein, tIIaIs the time when the rear vehicle passes through the second detection section, the expression is as follows:
tIIbis the time when the preceding vehicle passes through the second detection section, and the expression is as follows:
vIIbis the speed when the front vehicle passes through the 2 nd detection section, and the expression is as follows:
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