CN110956817B - Vehicle-mounted unit awakening method, device and system - Google Patents
Vehicle-mounted unit awakening method, device and system Download PDFInfo
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- CN110956817B CN110956817B CN201911211567.2A CN201911211567A CN110956817B CN 110956817 B CN110956817 B CN 110956817B CN 201911211567 A CN201911211567 A CN 201911211567A CN 110956817 B CN110956817 B CN 110956817B
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
- G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a vehicle-mounted unit awakening method, device and system, wherein at least one group of traffic flow images of a target area are obtained according to a target detection algorithm, the traffic flow images are obtained by real-time shooting through a camera device corresponding to the target area, the traffic flow detection result in the target area is obtained in real time according to the traffic flow images, and whether the vehicle-mounted unit in the target area is awakened through a road side unit corresponding to the target area is determined according to the traffic flow detection result. And when the vehicle-mounted unit is confirmed to be awakened, sending an awakening signal to the vehicle-mounted unit through the road side unit in the detection area so as to awaken the vehicle-mounted unit in the dormant state. When the vehicle-mounted unit is not awakened, the vehicle-mounted unit is in a dormant state, and the road side unit awakens when the vehicle-mounted unit is determined to be awakened according to actual road conditions, so that the vehicle-mounted unit is prevented from being in the awakened state for a long time, the service time of the vehicle-mounted unit is prolonged, and energy consumption is reduced.
Description
Technical Field
The invention relates to the field of information control, in particular to a method, a device and a system for waking up a vehicle-mounted unit.
Background
With the improvement of the living standard of residents and the increase of travel demands, the automobile keeping quantity in China continuously rises, and the automobile keeping quantity in China exceeds 2.5 hundred million by 6 months in 2019. Traffic congestion has become an urgent problem to be solved in city management. An implementation scheme for deepening the system reform of the toll roads and canceling the highway provincial toll stations is published in the office of the national institute of State department in 5 months in 2019, and the scheme requires further deepening the system reform of the toll roads, so that the national highway provincial toll stations are speeded up to be cancelled, and the non-stop rapid toll collection is realized. The traffic department combines a plurality of ministries to actively promote ETC (electronic toll collection system), strives for the proportion of ETC used by vehicles at the entrance of a highway to reach more than 90% before 2019 years. The data shows that by 2019, 8, 14 days, the nationwide ETC users are accumulated to 10696.64 ten thousand.
The OBU (vehicle-mounted unit) is used as a part of the ETC, can timely receive traffic information, is convenient for a vehicle owner to make a decision, timely avoids barriers, finally achieves reasonable shunting of vehicles, improves vehicle passing rate and reduces traffic accidents. In order to receive information in time, the sensitivity of awakening of the existing OBU is set to be high, or the OBU is awakened at the beginning of getting on the road, so that the OBU is in an awakening state for a long time, but most of the time, the OBU is in the awakening state but does not need to receive and send information, the current OBU is powered by a battery, if the OBU is in the awakening state for a long time, the use times of the OBU are greatly reduced, the waste of equipment and power resources is caused, the OBU is powered by a power supply system of an automobile, the OBU is in the awakening state for a long time, and the waste of the power resources is caused.
Disclosure of Invention
The invention mainly solves the technical problem that the vehicle-mounted unit is lack of scheduling management and is in an awakening state for a long time, so that the resource waste is caused.
According to a first aspect, an embodiment provides a vehicle-mounted unit wake-up method, including:
acquiring at least one group of traffic flow images of a target area, wherein the traffic flow images are obtained by real-time shooting through a camera device corresponding to the target area;
obtaining a traffic flow detection result positioned in the target area in real time according to the traffic flow image;
and determining whether the vehicle-mounted unit in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic flow detection result.
In one possible implementation manner, the traffic flow detection result includes a current vehicle density and/or a vehicle moving speed.
In one possible implementation manner, the obtaining, in real time, a traffic flow detection result located in the target area according to the traffic flow image includes:
and acquiring the number of vehicles of the traffic flow image and the area of a corresponding target area according to the traffic flow image and an image recognition algorithm, and calculating in real time to obtain the current vehicle density of the target area.
In one possible implementation manner, the determining whether to wake up the on-board unit located in the target area through the rsu corresponding to the target area according to the traffic flow detection result includes:
when the traffic flow detection result is the current vehicle density,
if the current vehicle density is larger than a first threshold value, determining that the road side unit suspending the target area sends a wake-up signal to the vehicle-mounted unit in the target area;
and if the current vehicle density is smaller than or equal to a first threshold value, determining to start or keep the road side unit of the target area to send a wake-up signal to the vehicle-mounted unit in the target area.
In one possible implementation manner, the target area includes M local areas, and each local area corresponds to at least one roadside unit and at least one camera device;
determining whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result, including:
acquiring H groups of traffic flow images shot in real time by the camera devices of M local areas in the target area to acquire the current vehicle density of the M local areas;
for each local area, if the current vehicle density of the local area is greater than a second threshold value, determining that the road side unit suspending the local area sends a wake-up signal to the vehicle-mounted unit in the local area;
if the current vehicle densities of the M local areas are all smaller than a second threshold value, the road side units corresponding to the N local areas are determined to be started or kept to send wake-up signals to the vehicle-mounted units in the target area, wherein the N local areas are the areas with the minimum current vehicle density;
m is greater than N, H is greater than or equal to M, M, N and H are positive integers.
In one possible implementation manner, the obtaining, in real time, a traffic flow detection result located in the target area according to the traffic flow image includes:
and calculating the vehicle moving speed of the target area in real time according to at least two frames of traffic flow images and an image recognition algorithm.
In one possible implementation manner, the determining whether to wake up the on-board unit located in the target area through the rsu corresponding to the target area according to the traffic flow detection result includes:
when the traffic flow detection result is the moving speed of the vehicle,
if the vehicle moving speed is less than a third threshold value, determining that the road side unit suspending the target area sends a wake-up signal to the vehicle-mounted unit in the target area;
and if the vehicle moving speed is greater than or equal to a third threshold value, determining to start or keep the road side unit of the target area to send a wake-up signal to the vehicle-mounted unit in the target area.
In one possible implementation manner, the target area includes M local areas, and each local area corresponds to at least one roadside unit and at least one camera device;
determining whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result, including:
acquiring H groups of traffic flow images shot in real time by the camera devices of M local areas in the target area to acquire the current vehicle moving speed of the M local areas; wherein each group of vehicular flow images comprises at least two frames of images;
for each local area, if the current vehicle moving speed of the local area is less than a fourth threshold value, determining to suspend the road side unit of the local area to send a wake-up signal to the vehicle-mounted unit in the local area;
if the current vehicle moving speeds of the M local areas are all larger than a fourth threshold value, determining to start or keep the road side units corresponding to the N local areas to send wake-up signals to the vehicle-mounted unit in the target area, wherein the N local areas are areas with the maximum current vehicle moving speed;
m is greater than N, H is greater than or equal to M, M, N and H are positive integers.
According to a second aspect, an embodiment provides an on-board unit wake-up device, comprising:
the system comprises an image acquisition module, a processing module and a display module, wherein the image acquisition module is used for acquiring at least one group of traffic flow images of a target area, and the traffic flow images are obtained by real-time shooting through a camera device corresponding to the target area;
the detection result acquisition module is used for acquiring the traffic flow detection result in the target area in real time according to the traffic flow image;
and the awakening determining module is used for determining whether the vehicle-mounted unit in the target area is awakened through the road side unit corresponding to the target area or not according to the traffic flow detection result.
According to a third aspect, an embodiment provides an on board unit wake-up system, comprising:
the camera device is used for shooting the vehicle positioned in the target area to acquire at least one group of traffic flow images of the target area;
the vehicle-mounted unit awakening device is used for acquiring a traffic flow detection result positioned in the target area in real time according to the traffic flow image, and determining whether the vehicle-mounted unit positioned in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic flow detection result;
the roadside unit is positioned in the detection area and used for sending a wake-up signal to the vehicle-mounted unit when the vehicle-mounted unit is determined to be woken up so as to wake up the vehicle-mounted unit in a dormant state;
and the vehicle-mounted unit is used for receiving the wake-up signal.
According to the method, the device and the system for waking up the vehicle-mounted unit in the embodiment, at least one group of traffic flow images of a target area are obtained according to a target detection algorithm, the traffic flow images are obtained by real-time shooting through a camera device corresponding to the target area, the traffic flow detection result in the target area is obtained in real time according to the traffic flow images, and whether the vehicle-mounted unit in the target area is woken up through a road side unit corresponding to the target area is determined according to the traffic flow detection result. And when the vehicle-mounted unit is confirmed to be awakened, sending an awakening signal to the vehicle-mounted unit through the road side unit in the detection area so as to awaken the vehicle-mounted unit in the dormant state. When the vehicle-mounted unit is not awakened, the vehicle-mounted unit is in a dormant state, and the road side unit awakens when the vehicle-mounted unit is determined to be awakened according to actual road conditions, so that the vehicle-mounted unit is prevented from being in the awakened state for a long time, the service time of the vehicle-mounted unit is prolonged, and energy consumption is reduced.
Drawings
FIG. 1 is a flowchart of a method for waking up a vehicle-mounted unit according to an embodiment of the present invention;
FIG. 2 is a flowchart of another wake-up method for a vehicle-mounted unit according to an embodiment of the present invention;
FIG. 3 is a flowchart of another wake-up method for a vehicle-mounted unit according to an embodiment of the present invention;
FIG. 4 is a flowchart of another wake-up method for a vehicle unit according to an embodiment of the present invention;
FIG. 5 is a flowchart of another wake-up method for a vehicle unit according to an embodiment of the present invention;
FIG. 6 is a block diagram of an embodiment of the invention for determining on-board unit devices;
fig. 7 is a diagram of a system for determining wakeup of a vehicle-mounted unit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In the embodiment of the invention, in order to avoid resource waste caused by the fact that the vehicle-mounted unit is in the awakening state for a long time, when the vehicle-mounted unit is not awakened, the vehicle-mounted unit is in the dormant state, the target located in the target area is subjected to target detection to obtain the traffic flow detection result, whether the wakening signal is sent by the road side unit located in the target area or not is determined according to the traffic flow detection result, the vehicle-mounted unit which needs to be wakened in the target area is awakened, and reasonable scheduling of awakening of the vehicle-mounted unit is realized. The vehicle-mounted unit awakening scheduling strategy controls the sending awakening signal of the road side unit, and the implementation of road side unit switching adjustment has important significance for electronic toll collection without parking and multi-lane free flow toll collection.
Example one
Referring to fig. 1, an embodiment of the invention provides a method for waking up a vehicle-mounted unit, including steps S10 to S30, which are described in detail below.
Step S10: at least one group of traffic flow images of the target area are obtained, and the traffic flow images are obtained through real-time shooting by the camera device corresponding to the target area.
In the embodiment of the present invention, a target area may be preset, the target area may be set as an entire picture area captured by the camera device, a target area of a subsequent vehicle may be set according to a roadside unit transaction area of a single gantry, and may also be set in combination with a lane, the target area may be set as an urban road, an expressway, or the like, and is used for performing wakeup control on an onboard unit on a traveling vehicle, for example, the target area may be set in an area of a highway toll station, including a front area of the highway toll station, an area in the highway toll station, and a rear area of the highway toll station, which is not specifically limited in this respect.
Step S20: and obtaining a traffic flow detection result positioned in the target area in real time according to the traffic flow image.
In the embodiment of the invention, the video information of the traffic flow image is processed according to an image recognition algorithm, and the detection and the positioning of the target in the target area are completed, so that the traffic flow detection result in the target area is obtained in real time.
It should be noted that the image recognition algorithm includes a conventional method and a deep learning method, wherein the conventional method includes: a cascade classifier framework: haar classifier/LBP cascade classifier/HOG (histogram of oriented gradient)/ACF feature + Adaboost; HoG + SVM; discrete transformed part models (DPM); template matching, etc. The deep learning method comprises the following steps: based on region propofol (two stage): the R-CNN family comprises fast R-CNN/Mask R-CNN/RFCN; based on regression: YOLO/YOLO 2/SSD/DSSD; special character sequence detection: CTPN (LSTM + R-CNN)/Seglink, etc.
Illustratively, a deep neural network is adopted to carry out vehicle detection and positioning on vehicles in a target area, the deep neural network is composed of a basic network and an extended network, the basic network is responsible for lower-level feature extraction, and the extended network is responsible for deep-level feature extraction, target classification and target positioning. The basic network can adopt a large neural network such as ResNet 101 and VGG19, and can also adopt a miniature neural network such as SqueezeNet and MobileNet. The extended network may be divided into a target feature extraction sub-network, a target classification sub-network and a target location sub-network. Mainly, the picture area is output as a picture area recognized as a vehicle, and the representation form of the picture area includes, but is not limited to, a rectangular frame.
In one possible implementation manner, the traffic flow detection result includes a current vehicle density and/or a vehicle moving speed.
In one possible implementation, step S20: the obtaining of the traffic flow detection result located in the target area in real time according to the traffic flow image includes:
and acquiring the number of vehicles of the traffic flow image and the area of a corresponding target area according to the traffic flow image and an image recognition algorithm, and calculating in real time to obtain the current vehicle density of the target area.
In the embodiment of the invention, the vehicle detection and positioning in the target area are realized based on artificial intelligence, the vehicle density can be obtained, and then the vehicle density of the traffic flow detection result is taken as a decision variable to carry out the vehicle-mounted unit awakening scheduling strategy of a road section in the target area and even a certain local area of the target area. Illustratively, the vehicle density of the target area is to be calculated: vehicle density is the number of vehicles in a zone per area of the zone. Further, the vehicle-mounted unit awakening scheduling strategy can be determined according to the vehicle density of different sections or the vehicle density of lanes.
Step S30: and determining whether the vehicle-mounted unit in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic flow detection result.
In this embodiment of the present invention, the step S30 of determining whether to wake up the vehicle-mounted unit located in the target area by the rsu corresponding to the target area according to the traffic flow detection result at least includes the following possible implementation manners, which are described in detail below.
The first possible implementation, referring to fig. 2, includes steps S301 to S303, which are described in detail below.
Step S301: and when the traffic flow detection result is the current vehicle density.
Step S302: and if the current vehicle density is larger than a first threshold value, determining that the road side unit suspending the target area sends a wake-up signal to the vehicle-mounted unit in the target area.
Step S303: and if the current vehicle density is smaller than or equal to a first threshold value, determining to start or keep the road side unit of the target area to send a wake-up signal to the vehicle-mounted unit in the target area. Specifically, when the current vehicle density is less than or equal to a first threshold value, the roadside unit is turned on when the previous state of the roadside unit is a closed state; and when the last state of the road side unit is the opening state, the road side unit is kept in the opening state.
In the embodiment of the invention, when the current vehicle density is greater than the first threshold, it can be considered that the vehicles in the target area are too many, the vehicles are currently in a traffic jam state, and a long waiting time is needed, and the vehicle-mounted unit of the vehicles in the target area is paused to be awakened. When the current vehicle density is smaller than or equal to the first threshold value, it is determined that the vehicles in the target area are few, the current traffic smooth state is processed, the area needing to be awakened to work by the vehicle-mounted unit can be reached without waiting for a long time, for example, a toll station, and the road side unit which is determined to start or maintain the target area sends an awakening signal to the vehicle-mounted unit in the target area.
The second possible implementation, referring to fig. 3, includes steps S311 to S314, which will be described in detail below.
Step S311: the target area comprises M local areas, and each local area corresponds to at least one road side unit and at least one camera device.
Determining whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result, including:
step S312: and acquiring the current vehicle density of the M local areas according to the H groups of traffic flow images acquired by real-time shooting of the camera devices of the M local areas in the target area.
Step S313: and for each local area, if the current vehicle density of the local area is greater than a second threshold value, determining that the road side unit suspending the local area sends a wake-up signal to the vehicle-mounted unit in the local area.
Step S314: if the current vehicle densities of the M local areas are smaller than a second threshold value, the road side units corresponding to the N local areas are determined to be started or kept to send wake-up signals to the vehicle-mounted units in the target area, wherein the N local areas are the areas with the minimum current vehicle density, M is larger than N, H is larger than or equal to M, M, N and H are positive integers. M may be greater than or equal to 1 and N may be greater than or equal to 1. Specifically, when the vehicle density in the local area is less than or equal to the second threshold value, the corresponding road side unit is turned on when the previous state of the road side unit is the closed state; and when the last state of the corresponding road side unit is the opening state, the opening state is kept.
In the embodiment of the present invention, the first possible implementation manner is different from the second possible implementation manner in that the first possible implementation manner is wakeup scheduling for a small range of vehicle-mounted units, and the second possible implementation manner is wakeup scheduling for a large range of vehicle-mounted units. The first possible implementation manner and the second possible implementation manner may be combined together to perform scheduling, and the present invention is not particularly limited to this.
In some embodiments, if the target region is a small-range region, and the number of RSUs in the region is small, for example, there is only one RSU section, a small-range scheduling policy is adopted: if the vehicle density of the section is greater than a preset value r1, the RSU of the section does not send a wake-up signal; if the vehicle density of the section is less than or equal to a preset value r1, the RSU of the section sends a wake-up signal. If the target area is a large-scale area, and the number of RSUs in the area is large, for example, a highway section or an urban road including a plurality of sections, a large-scale scheduling strategy is adopted: for each section of the road section, if the current vehicle density of the section of the road section is greater than a preset value r2, determining that the RSU suspending the section sends a wake-up signal; if the vehicle density of each section of the road segment is less than the preset value r2, selecting a plurality of RSUs to send out wake-up signals, wherein two RSUs corresponding to the section with the minimum vehicle density can be selected to send out wake-up signals, so as to avoid the situation that the RSUs of the whole road segment do not send out wake-up signals, which results in that the path identification of the vehicles of the road segment cannot be carried out.
The following is a detailed description in four ways.
The first method is as follows:
when the target area is a section, the corresponding vehicle density is the vehicle density of the section:
and when the vehicle density is greater than a second threshold value, determining to suspend the road side unit corresponding to the section to send a wake-up signal to the vehicle-mounted unit on the section.
And when the vehicle density is smaller than or equal to a second threshold value, determining to start or keep the road side unit corresponding to the section to send a wake-up signal to the vehicle-mounted unit in the section. Specifically, when the density of the vehicles on the section is less than or equal to the second threshold value, the roadside unit of the section is turned on when the previous state of the roadside unit of the section is a closed state; and when the last state of the corresponding road side unit is the opening state, the opening state is kept.
It should be noted that the section in the embodiment of the present invention refers to a section of an urban road or a highway, which is a combination of a longitudinal section and a transverse section of the urban road or the highway, and a vertical section along a center line of the road is referred to as a longitudinal section, which reflects a vertical line shape of the road; a section perpendicular to the center line of the roadway is called a cross-section.
In the first mode, the section information in the target area may be preset, and the vehicle density of each section in the target area may be obtained according to the preset section information. For example, in the target area, three cross sections may be provided, and the vehicle density of each cross section may be acquired from the cross section acquisition points, where the first cross section acquisition point is located at the start position of the target area, the second cross section acquisition point is located at the middle position of the target area, and the third cross section acquisition point is located at the end position of the target area.
In the first mode, when the density value of the vehicles is greater than the second threshold value, it may be considered that too many vehicles are in the target area, and the vehicles cannot pass through quickly in a short time, for example, in the case of traffic jam, the density of the vehicles on a certain section is high, and a long waiting time may be needed, so that it is determined that the roadside unit corresponding to the section is suspended to send the wake-up signal to the on-board unit on the section. Correspondingly, when the vehicle density is smaller than or equal to the second threshold value, it can be considered that the number of vehicles in the target area is small, the vehicles can normally pass through, and the vehicle-mounted unit needs to be awakened so as to facilitate decision-making of a user and timely obstacle avoidance, so that reasonable shunting of the vehicles is finally realized, the vehicle passing rate is improved, and traffic accidents are reduced.
It should be noted that there may be at least one vehicle in a section, and when there are more than two vehicles, operating the vehicle on the section means performing corresponding operation on each vehicle on the section, for example, simultaneously sending a wake-up signal to the on-board unit on each vehicle on the section.
The second method comprises the following steps:
when the target area is a lane, the corresponding vehicle density is the vehicle density of the lane:
and when the vehicle density is greater than a second threshold value, determining to pause the road side unit corresponding to the lane to send a wake-up signal to the vehicle-mounted unit in the lane.
And when the vehicle density is smaller than or equal to a second threshold value, determining to start or keep the road side unit corresponding to the lane to send a wake-up signal to the vehicle-mounted unit in the lane. Specifically, when the vehicle density of the lane is less than or equal to the second threshold value, the roadside unit of the lane is turned on when the previous state of the roadside unit of the lane is a closed state; and when the previous state of the road side unit of the lane is an opening state, the road side unit is kept in the opening state.
In the embodiment of the present invention, the target area may include a plurality of lanes, and the vehicle condition corresponding to each lane is different, for example, during the downtown peak, there are more vehicles in the downtown lane than in the downtown lane, and the vehicle density is reasonably scheduled for each lane.
In the second mode, correspondingly, when the vehicle density of a certain lane is greater than the second threshold, it can be considered that the vehicles on the lane are too many and cannot pass through according to normal conditions, and there is a long waiting time, so that the vehicle-mounted unit does not need to be awakened.
It should be noted that at least one vehicle may exist in a lane in one target area, and when two or more vehicles exist, the operation on the vehicle in the lane means that all vehicles in the lane are correspondingly operated, for example, the on-board units on all vehicles in the lane are awakened at the same time.
The third method comprises the following steps:
aiming at the vehicle density in a target area, wherein the target area can be a highway section or an urban road, the highway section or the urban road comprises a plurality of local areas, and the local areas can be section areas or lane areas:
and when the vehicle density is greater than a second threshold value, determining that the road side unit suspending the target area sends a wake-up signal to the vehicle-mounted unit in the target area.
And when the vehicle density is smaller than or equal to a second threshold value, sequencing the vehicle density corresponding to each section in the target area from small to large, acquiring a first section where the vehicle with the vehicle density sequenced before the N value is located, and scheduling the vehicle-mounted unit of the vehicle in the first section to wake up.
The third mode is different from the first and second modes in that the vehicle density in the target area is not obtained but obtained instead of the vehicle density calculated on a certain cross section or a certain lane.
In the third mode, when the vehicle density is greater than the second threshold, it may be considered that the number of vehicles in the target area is too large, and if a long wait may be required, the on-board unit of the vehicle in the target area is not woken up. And when the vehicle density is smaller than or equal to a second threshold value, performing selective awakening, sorting according to the vehicle density corresponding to each section in the target area from small to large, and then acquiring a first section where the vehicle with the vehicle density sorted before the N value is located, wherein illustratively, if N is 2, two sections with the minimum vehicle density are selected to transmit awakening signals, so that the roadside units in all the road sections are prevented from not transmitting awakening signals.
The method is as follows:
aiming at the vehicle density in a target area, wherein the target area can be a highway section or an urban road, the highway section or the urban road comprises a plurality of local areas, and the local areas can be section areas or lane areas:
and when the vehicle density is greater than a second threshold value, determining that the road side unit suspending the target area sends a wake-up signal to the vehicle-mounted unit in the target area.
And when the vehicle density of the vehicles is smaller than or equal to a second threshold value, sequencing the vehicle density on each lane in the target area from small to large.
And acquiring a first lane where the vehicles with the vehicle density ranked before the N value are located.
And scheduling the on-board unit of the vehicle in the first lane to wake up.
The fourth mode is different from the first and second modes in that the vehicle density calculated on a certain cross section or a certain lane is not obtained, and the vehicle density in the target area is obtained, and the fourth mode is different from the third mode in that the vehicle densities of different lanes are sorted instead of the vehicle densities of different cross sections when the selective awakening is performed.
It should be noted that, when determining the on-board unit wakeup scheduling policy according to the vehicle density, any one or more of the first mode, the second mode, the third mode, and the fourth mode may be used, which is not specifically limited in the present invention.
In one possible implementation manner, the obtaining, in real time, a traffic flow detection result located in the target area according to the traffic flow image includes:
and calculating the vehicle moving speed of the target area in real time according to at least two frames of traffic flow images and an image recognition algorithm.
Step S30 is to determine whether to wake up the on-board unit located in the target area by the road side unit corresponding to the target area according to the traffic flow detection result, and includes a third possible implementation manner and a fourth possible implementation manner, which are described in detail below.
A third possible implementation manner, referring to fig. 4, includes steps S321 to S323, which will be described in detail below.
Step S321: and when the traffic flow detection result is the moving speed of the vehicle.
Step S322: and if the vehicle moving speed is less than a third threshold value, determining that the road side unit suspending the target area sends a wake-up signal to the vehicle-mounted unit in the target area.
Step S323: and if the vehicle moving speed is greater than or equal to a third threshold value, determining to start or keep the road side unit of the target area to send a wake-up signal to the vehicle-mounted unit in the target area.
In the embodiment of the present invention, when the moving speed of the vehicle is less than the third threshold, it may be considered that the vehicles in the target area are too many, and a long wait is required, and the on-board unit of the vehicle in the target area is not awakened in advance. When the current vehicle density is greater than or equal to the third threshold value, it is determined that the vehicles in the target area are not too many, and the vehicles reach an area where the vehicle-mounted unit needs to be awakened to work without waiting for a long time, such as a toll station, and it is determined that the road side unit of the target area is started or kept to send an awakening signal to the vehicle-mounted unit in the target area. Specifically, when the moving speed of the vehicle is less than a third threshold value, when the previous state of the roadside unit is a closed state, the corresponding roadside unit is started; and when the last state of the corresponding road side unit is the opening state, the opening state is kept.
A fourth possible implementation manner, referring to fig. 5, includes steps S331 to S334, which are described in detail below.
Step S331: the target area comprises M local areas, and each local area corresponds to at least one road side unit and at least one camera device.
Determining whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result, including:
step S332: acquiring H groups of traffic flow images shot in real time by the camera devices of M local areas in the target area to acquire the current vehicle moving speed of the M local areas; wherein each set of vehicular flow images includes at least two frames of images.
Step S333: and for each local area, if the current vehicle moving speed of the local area is less than a fourth threshold value, determining that the road side unit suspending the local area sends a wake-up signal to the vehicle-mounted unit in the local area.
Step S334: if the current vehicle moving speeds of the M local areas are all greater than the fourth threshold, it is determined to turn on or keep the roadside units corresponding to the N local areas to send the wake-up signal to the on-board unit in the target area, specifically, under the condition that the current vehicle moving speeds of the M local areas are all greater than the fourth threshold, in the roadside units corresponding to the N local areas, if the previous state is a closed state, the roadside units are turned on, and if the previous state is an open state, the roadside units are kept. The N local areas are areas with the maximum current vehicle moving speed, M is larger than N, H is larger than or equal to M, M, N and H are positive integers. M may be greater than 1 and N may be greater than or equal to 1. Specifically, when the current vehicle moving speed is greater than the fourth threshold value, the roadside unit is turned on when the previous state of the roadside unit is the off state; and when the last state of the road side unit is the opening state, the road side unit is kept in the opening state.
In the embodiment of the present invention, the third possible implementation manner is different from the fourth possible implementation manner in that the third possible implementation manner is wakeup scheduling for vehicle-mounted units of vehicles in a small range, and the fourth possible implementation manner is wakeup scheduling for vehicle-mounted units of vehicles in a large range. For the third possible implementation manner and the fourth possible implementation manner, they may be combined together for scheduling, and the present invention is not limited in this respect.
In some embodiments, if the target region is a small-range region, and the number of RSUs in the region is small, for example, there is only one RSU section, another small-range scheduling policy is adopted: if the vehicle moving speed of the section is less than a preset value v1, the RSU of the section does not send a wake-up signal; if the vehicle moving speed of the cross section is greater than or equal to a preset value v1, the RSU of the cross section sends a wake-up signal. If the target area is a large-scale area, and the number of RSUs in the area is large, for example, a highway section or an urban road including multiple sections, another large-scale scheduling strategy is adopted: for each section of the road section, if the current vehicle moving speed of the section of the road section is less than a preset value r2, determining that the RSU suspending the section sends a wake-up signal; if the current vehicle moving speed of each section of the road section is greater than a preset value r2, selecting a plurality of RSUs to send out wake-up signals, wherein two RSUs corresponding to the section with the highest vehicle moving speed can be selected to send out the wake-up signals, so as to avoid the situation that the RSUs of the whole road section do not send the wake-up signals, which results in that the path identification of the vehicles of the road section cannot be carried out.
The following is a detailed description in four ways.
The fifth mode is as follows:
when the target area is a cross section, the corresponding vehicle moving speed is the vehicle moving speed of the cross section:
and when the moving speed is greater than a fourth threshold value, scheduling the vehicle-mounted unit of the vehicle corresponding to the section to wake up.
And when the moving speed is less than or equal to a fourth threshold value, scheduling the vehicle-mounted unit corresponding to the section not to be awakened.
The difference between the fifth mode and the first mode is that the variable for making the decision is the vehicle moving speed, not the vehicle density. And when the moving speed of the vehicle is greater than the fourth threshold value, the vehicle on the section is considered to pass according to a normal state, and the vehicle-mounted unit of the vehicle corresponding to the section is dispatched to wake up. And when the moving speed of the vehicle is less than or equal to the fourth threshold value, the vehicle on the section is not considered to pass according to the normal state, and the vehicle-mounted unit corresponding to the section is dispatched not to be awakened.
The method six:
when the target area is a lane, the corresponding vehicle moving speed is the vehicle moving speed of the lane:
and when the moving speed is greater than a fourth threshold value, scheduling the vehicle-mounted unit of the vehicle corresponding to the lane to wake up.
And when the moving speed is less than or equal to a fourth threshold value, scheduling the vehicle-mounted unit of the vehicle corresponding to the lane not to wake up.
The difference between the sixth mode and the fifth mode is that the sixth mode corresponds to the moving speed of the vehicle on the lane, not the moving speed of the vehicle on the cross section.
The method is as follows:
aiming at the moving speed of the vehicle in the target area, wherein the target area can be a highway section or an urban road, the highway section or the urban road comprises a plurality of local areas, and the local areas can be section areas or lane areas:
and when the moving speed is greater than a fourth threshold value, scheduling the vehicle-mounted unit of the vehicle in the target area to wake up.
And when the moving speed is less than or equal to a fourth threshold value, sequencing the moving speeds of the vehicles corresponding to all the sections in the target area from large to small.
And acquiring a second section where the vehicles with the moving speeds sequenced before the N value are located.
And scheduling the on-board unit of the vehicle in the second section to wake up.
The seventh mode differs from the third mode in that it calculates the moving speed of the vehicle in the entire target area, not the density of the vehicle in the entire target area. And then sorting the vehicles from small to large according to the moving speeds of the vehicles corresponding to different cross section layers in the target area, selecting a second cross section where the vehicles with the moving speed sorting before the N value are located, and awakening the vehicle corresponding to the second cross section.
The method eight:
aiming at the moving speed in the target area, wherein the target area can be an expressway or an urban road, the expressway or the urban road comprises a plurality of local areas, and the local areas can be section areas or lane areas:
when the moving speed is larger than a fourth threshold value, scheduling the vehicle-mounted unit of the vehicle in the target area to wake up;
when the moving speed is smaller than or equal to a fourth threshold value, sorting the moving speed on each lane in the target area from large to small;
acquiring a second lane where vehicles with moving speeds sequenced before the N value are located;
and scheduling the on-board unit of the vehicle in the second lane to wake up.
The difference between the eighth mode and the seventh mode is that the modes are ranked from small to large according to the moving speeds of the vehicles corresponding to different lanes in the target area, the second lane where the vehicle with the moving speed ranked before the N value is located is selected, and the vehicle corresponding to the second cross section is awakened.
It should be noted that, when determining the vehicle-mounted unit wakeup scheduling policy according to the vehicle moving speed, any one or more of the fifth mode, the sixth mode, the seventh mode, and the eighth mode may be used, and the present invention is not limited in this respect.
It should be noted that determining the on-board unit wake-up according to the vehicle density and determining the on-board unit wake-up according to the moving speed may be used alone or in combination, and determining the on-board unit wake-up according to the actual situation, which is not specifically limited in the present invention.
In one possible implementation manner, the traffic flow detection result further includes an obstacle;
step S30, determining whether to wake up the on-board unit located in the target area by the rsu corresponding to the target area according to the traffic flow detection result, further includes:
and when the obstacle is determined to be in the target area according to the traffic flow detection result, acquiring a third cross section or a third lane where the obstacle is located, and determining that the vehicle-mounted unit awakening scheduling strategy is to schedule the vehicle in the third cross section or the third lane to be awakened by the vehicle-mounted unit.
In the embodiment of the invention, when the obstacle in the target area is detected, the wake-up signal can be sent to the vehicle-mounted unit on the vehicle passing through the third section or the third lane where the obstacle is located in advance.
The implementation of the embodiment has the following characteristics:
the method comprises the steps of obtaining at least one group of traffic flow images of a target area according to a target detection algorithm, obtaining the traffic flow images through real-time shooting of a camera device corresponding to the target area, obtaining a traffic flow detection result located in the target area in real time according to the traffic flow images, and determining whether a vehicle-mounted unit located in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic flow detection result. And when the vehicle-mounted unit is confirmed to be awakened, sending an awakening signal to the vehicle-mounted unit through the road side unit in the detection area so as to awaken the vehicle-mounted unit in the dormant state. When the vehicle-mounted unit is not awakened, the vehicle-mounted unit is in a dormant state, and the road side unit awakens when the vehicle-mounted unit is determined to be awakened according to actual road conditions, so that the vehicle-mounted unit is prevented from being in the awakened state for a long time, the service time of the vehicle-mounted unit is prolonged, and energy consumption is reduced.
Example two
Referring to fig. 6, an embodiment of the present invention provides a vehicle-mounted unit wake-up apparatus, including an image acquisition module 51, a detection result acquisition module 52, and a wake-up determination module 53, which are described in detail below.
The image acquiring module 51 is configured to acquire at least one set of traffic flow images of the target area, where the traffic flow images are obtained by real-time shooting through a camera corresponding to the target area.
And the detection result acquisition module 52 is configured to acquire a traffic flow detection result located in the target area in real time according to the traffic flow image.
And the awakening determination module 53 is configured to determine whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result.
The implementation of the embodiment has the following characteristics:
a vehicle-mounted unit awakening device comprises an image acquisition module 51, a detection result acquisition module 52 and an awakening determination module 53, wherein the image acquisition module 51 is used for acquiring at least one group of traffic images of a target area, the traffic images are obtained by real-time shooting through a camera device corresponding to the target area, the detection result acquisition module 52 is used for obtaining the traffic detection result located in the target area in real time according to the traffic images, and the awakening determination module 53 is used for determining whether the vehicle-mounted unit located in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic detection result. And determining whether the vehicle-mounted unit in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic flow detection result. And when the vehicle-mounted unit is confirmed to be awakened, sending an awakening signal to the vehicle-mounted unit through the road side unit in the detection area so as to awaken the vehicle-mounted unit in the dormant state. When the vehicle-mounted unit is not awakened, the vehicle-mounted unit is in a dormant state, and the road side unit awakens when the vehicle-mounted unit is determined to be awakened according to actual road conditions, so that the vehicle-mounted unit is prevented from being in the awakened state for a long time, the service time of the vehicle-mounted unit is prolonged, and energy consumption is reduced.
EXAMPLE III
Referring to fig. 7, an embodiment of the present invention provides an on-board unit wake-up system, which includes a camera 61, an on-board unit wake-up device 62, a road side unit 63, and an on-board unit 64, which are described in detail below.
The camera 61 is configured to capture images of a vehicle located in the target area to obtain at least one set of traffic flow images of the target area.
The on-board unit awakening device 62 is configured to obtain a traffic flow detection result located in the target area in real time according to the traffic flow image, and determine whether to awaken the on-board unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result.
The road side unit 63 is located in the target area and used for sending a wake-up signal to the on-board unit when the on-board unit is determined to be woken up, so that the on-board unit in a sleeping state is woken up.
The on-board unit 64 is configured to receive a wake-up signal.
The implementation of the embodiment has the following characteristics:
a vehicle-mounted unit awakening system comprises a camera device 61, a vehicle-mounted unit awakening device 62, a road side unit 63 and a vehicle-mounted unit 64, wherein the camera device 61 is used for shooting a vehicle located in a target area to obtain at least one group of traffic images of the target area, the vehicle-mounted unit awakening device 62 is used for obtaining a traffic detection result located in the target area in real time according to the traffic images to determine whether the vehicle-mounted unit located in the target area is awakened through the road side unit corresponding to the target area or not according to the traffic detection result, the road side unit 63 is located in the target area and used for sending an awakening signal to the vehicle-mounted unit to awaken the vehicle-mounted unit in a dormant state when the vehicle-mounted unit is determined to be awakened, and the vehicle-mounted unit 64 is used for receiving the awakening signal. And determining whether the vehicle-mounted unit in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic flow detection result. And when the vehicle-mounted unit is confirmed to be awakened, sending an awakening signal to the vehicle-mounted unit through the road side unit in the detection area so as to awaken the vehicle-mounted unit in the dormant state. When the vehicle-mounted unit is not awakened, the vehicle-mounted unit is in a dormant state, and the road side unit awakens when the vehicle-mounted unit is determined to be awakened according to actual road conditions, so that the vehicle-mounted unit is prevented from being in the awakened state for a long time, the service time of the vehicle-mounted unit is prolonged, and energy consumption is reduced.
Example four
The present application further provides a computer-readable storage medium comprising at least: comprising a program executable by a processor for implementing the method as described in any of the first embodiment.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by computer programs. When all or part of the functions of the above embodiments are implemented by a computer program, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to realize the above functions. For example, the program may be stored in a memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above may be implemented. In addition, when all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and may be downloaded or copied to a memory of a local device, or may be version-updated in a system of the local device, and when the program in the memory is executed by a processor, all or part of the functions in the above embodiments may be implemented.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (8)
1. A method for waking up an on-board unit, comprising:
acquiring at least one group of traffic flow images of a target area, wherein the traffic flow images are obtained by real-time shooting through a camera device corresponding to the target area;
according to the traffic flow image, obtaining a traffic flow detection result located in the target area in real time, wherein the traffic flow detection result comprises the current vehicle density;
determining whether a vehicle-mounted unit located in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic flow detection result;
the target area comprises M local areas, and each local area corresponds to at least one road side unit and at least one camera device:
when the traffic flow detection result is the current vehicle density, determining whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result, wherein the method comprises the following steps:
acquiring H groups of traffic flow images shot in real time by the camera devices of M local areas in the target area to acquire the current vehicle density of the M local areas;
for each local area, if the current vehicle density of the local area is greater than a second threshold value, determining that the road side unit suspending the local area sends a wake-up signal to the vehicle-mounted unit in the local area;
if the current vehicle densities of the M local areas are smaller than a second threshold value, the road side units corresponding to the N local areas are determined to be started or kept to send wake-up signals to the vehicle-mounted units in the target area, wherein the N local areas are the areas with the minimum current vehicle density, M is larger than N, H is larger than or equal to M, M, N and H are positive integers.
2. The method of claim 1, wherein the traffic flow detection result comprises a current vehicle movement speed.
3. The method of claim 2, wherein the obtaining the traffic flow detection result in the target area in real time according to the traffic flow image comprises:
and acquiring the number of vehicles of the traffic flow image and the area of a corresponding target area according to the traffic flow image and an image recognition algorithm, and calculating in real time to obtain the current vehicle density of the target area.
4. The method of claim 2, wherein the obtaining the traffic flow detection result in the target area in real time according to the traffic flow image comprises:
and calculating the vehicle moving speed of the target area in real time according to at least two frames of traffic flow images and an image recognition algorithm.
5. The method of claim 4, wherein the determining whether to wake up an on-board unit located within the target area by a RSU corresponding to the target area according to the traffic flow detection result comprises:
when the traffic flow detection result is the moving speed of the vehicle,
if the vehicle moving speed is less than a third threshold value, determining that the road side unit suspending the target area sends a wake-up signal to the vehicle-mounted unit in the target area;
and if the vehicle moving speed is greater than or equal to a third threshold value, determining to start or keep the road side unit of the target area to send a wake-up signal to the vehicle-mounted unit in the target area.
6. The method of claim 5,
the target area comprises M local areas, and each local area corresponds to at least one road side unit and at least one camera device;
determining whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result, including:
acquiring H groups of traffic flow images shot in real time by the camera devices of M local areas in the target area to acquire the current vehicle moving speed of the M local areas; wherein each group of vehicular flow images comprises at least two frames of images;
for each local area, if the current vehicle moving speed of the local area is less than a fourth threshold value, determining to suspend the road side unit of the local area to send a wake-up signal to the vehicle-mounted unit in the local area;
if the current vehicle moving speeds of the M local areas are all larger than a fourth threshold value, determining to start or keep the road side units corresponding to the N local areas to send wake-up signals to the vehicle-mounted unit in the target area, wherein the N local areas are areas with the maximum current vehicle moving speed;
m is greater than N, H is greater than or equal to M, M, N and H are positive integers.
7. An on-board unit wake-up device, comprising:
the system comprises an image acquisition module, a processing module and a display module, wherein the image acquisition module is used for acquiring at least one group of traffic flow images of a target area, and the traffic flow images are obtained by real-time shooting through a camera device corresponding to the target area;
the detection result acquisition module is used for acquiring a traffic flow detection result positioned in the target area in real time according to the traffic flow image, wherein the traffic flow detection result comprises the current vehicle density;
the awakening determining module is used for determining whether the vehicle-mounted unit in the target area is awakened through the road side unit corresponding to the target area or not according to the traffic flow detection result;
the target area comprises M local areas, and each local area corresponds to at least one road side unit and at least one camera device:
when the traffic flow detection result is the current vehicle density, determining whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result, wherein the method comprises the following steps:
acquiring H groups of traffic flow images shot in real time by the camera devices of M local areas in the target area to acquire the current vehicle density of the M local areas;
for each local area, if the current vehicle density of the local area is greater than a second threshold value, determining that the road side unit suspending the local area sends a wake-up signal to the vehicle-mounted unit in the local area;
if the current vehicle densities of the M local areas are smaller than a second threshold value, the road side units corresponding to the N local areas are determined to be started or kept to send wake-up signals to the vehicle-mounted units in the target area, wherein the N local areas are the areas with the minimum current vehicle density, M is larger than N, H is larger than or equal to M, M, N and H are positive integers.
8. An on-board unit wakeup system, comprising:
the camera device is used for shooting the vehicle positioned in the target area to acquire at least one group of traffic flow images of the target area;
the vehicle-mounted unit awakening device is used for acquiring a traffic flow detection result positioned in the target area in real time according to the traffic flow image, so as to determine whether the vehicle-mounted unit positioned in the target area is awakened through a road side unit corresponding to the target area or not according to the traffic flow detection result, and the traffic flow detection result comprises the current vehicle density;
the roadside unit is positioned in the detection area and used for sending a wake-up signal to the vehicle-mounted unit when the vehicle-mounted unit is determined to be woken up so as to wake up the vehicle-mounted unit in a dormant state;
the vehicle-mounted unit is used for receiving the wake-up signal;
the target area comprises M local areas, and each local area corresponds to at least one road side unit and at least one camera device:
when the traffic flow detection result is the current vehicle density, determining whether to awaken the vehicle-mounted unit located in the target area through the road side unit corresponding to the target area according to the traffic flow detection result, wherein the method comprises the following steps:
acquiring H groups of traffic flow images shot in real time by the camera devices of M local areas in the target area to acquire the current vehicle density of the M local areas;
for each local area, if the current vehicle density of the local area is greater than a second threshold value, determining that the road side unit suspending the local area sends a wake-up signal to the vehicle-mounted unit in the local area;
if the current vehicle densities of the M local areas are smaller than a second threshold value, the road side units corresponding to the N local areas are determined to be started or kept to send wake-up signals to the vehicle-mounted units in the target area, wherein the N local areas are the areas with the minimum current vehicle density, M is larger than N, H is larger than or equal to M, M, N and H are positive integers.
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| CN113570902B (en) * | 2020-04-28 | 2023-04-07 | 比亚迪股份有限公司 | Vehicle-to-vehicle communication method based on obstacle detection triggering, vehicle and communication equipment |
| CN113734232B (en) * | 2020-05-29 | 2023-09-05 | 比亚迪股份有限公司 | Railway vehicle state detection method, vehicle-mounted controller and regional controller |
| CN112203255B (en) * | 2020-09-11 | 2024-04-09 | 北京万集科技股份有限公司 | Control method and system of vehicle-mounted unit, storage medium and electronic device |
| CN112738768B (en) * | 2020-12-22 | 2024-01-12 | 三川在线(杭州)信息技术有限公司 | Vehicle-mounted system and communication method thereof |
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