阅读说明：本技术 一种基于v2x的车辆优先通行系统及方法 (V2X-based vehicle priority passing system and method ) 是由 何晓汉 张利 于 2021-07-01 设计创作，主要内容包括：本发明涉及车联网领域,特别涉及一种基于V2X的车辆优先通行系统及方法。提供一种基于V2X的车辆优先通行系统及方法,该系统包括：设置于特种车辆上的车载OBU终端、设置于特种车辆上的定位单元车载GPS装置、设置于社会车辆上的车载OBU终端、设置于社会车辆上的车载GPS装置。所述方法为特种车辆车载GPS采集本车GPS数据,车载OBU与地图文件匹配算出车道号,将其车道号与定位信息通过V2X广播方式持续发送给通信范围内的其他社会车辆,其它社会车辆接收到信号后,通过自身车载OBU显示终端将该信息显示出来。即社会车辆车主可以通过车载OBU实时获取特种车辆当前所处的位置以及所在车道号,有利于车主提前让道给特种车辆优先通行。该方式易于实现,不依赖较为复杂的软件算法,可以对特种车辆优先通行起到较为明显的辅助作用。(The invention relates to the field of car networking, in particular to a vehicle priority passing system and method based on V2X. A vehicle priority passing system and a method based on V2X are provided, the system comprises: the system comprises a vehicle-mounted OBU terminal arranged on the special vehicle, a positioning unit vehicle-mounted GPS device arranged on the special vehicle, a vehicle-mounted OBU terminal arranged on the social vehicle and a vehicle-mounted GPS device arranged on the social vehicle. The method includes that vehicle-mounted GPS of a special vehicle collects vehicle GPS data, a vehicle-mounted OBU is matched with a map file to calculate a lane number, the lane number and positioning information are continuously sent to other social vehicles in a communication range in a V2X broadcasting mode, and the information is displayed through a vehicle-mounted OBU display terminal after the other social vehicles receive signals. The social vehicle owner can obtain the current position and the lane number of the special vehicle through the vehicle-mounted OBU in real time, and the vehicle owner can give way in advance to give the special vehicle priority to pass. The method is easy to realize, does not depend on a complex software algorithm, and can play an obvious auxiliary role in preferential passage of special vehicles.)

1. A vehicle priority passing system based on V2X, comprising: set up on the special vehicle on-vehicle OBU terminal, set up on the social vehicle on-vehicle OBU terminal, wherein: the special vehicle and the social vehicle are both provided with vehicle-mounted GPS devices, the vehicle-mounted GPS devices of the special vehicle are connected with the vehicle-mounted OBU terminals of the special vehicle, the vehicle-mounted GPS devices acquire the positioning data of the special vehicle and send the positioning data to the vehicle-mounted OBU terminals of the special vehicle, and the vehicle-mounted OBU terminals form special vehicle position data and send the special vehicle position data to other social vehicles in a V2X communication mode; the vehicle-mounted GPS device of the social vehicle is connected with the vehicle-mounted OBU terminal of the social vehicle, the vehicle-mounted GPS device acquires the positioning data of the vehicle and sends the positioning data to the vehicle-mounted OBU terminal of the social vehicle, the vehicle-mounted OBU terminal of the social vehicle forms the position data of the social vehicle from the positioning data of the vehicle, and the vehicle-mounted OBU terminal of the social vehicle forms prompt information after comparing the position data of the special vehicle and the position data of the vehicle and displays the prompt information on the display terminal.

2. The V2X-based vehicle priority passing system according to claim 1, wherein the special vehicle location data includes lane number and location, speed, heading of the vehicle.

3. A vehicle priority passing method based on V2X is applied to the vehicle priority passing system based on V2X as claimed in claim 1 or 2,

firstly, collecting map information to make a map file, and loading the map file into a vehicle-mounted OBU terminal on a special vehicle;

secondly, the vehicle-mounted OBU terminal on the special vehicle acquires the GPS positioning data information of the vehicle from the GPS device of the vehicle;

thirdly, the vehicle-mounted OBU terminal on the special vehicle judges the relation between the position information of the GPS and a map in a map file in real time, map matching is carried out according to the vehicle positioning data, and the lane number of the special vehicle is calculated;

fourthly, the vehicle-mounted OBU terminal on the special vehicle sends the lane number of the special vehicle to other social vehicles in the communication range of the special vehicle V2X in a V2X communication mode;

and step five, after the social vehicle receives the lane number of the special vehicle in a V2X communication mode, a vehicle-mounted GPS device on the social vehicle acquires the GPS positioning data information of the vehicle and sends the positioning data to a vehicle-mounted OBU device, the vehicle-mounted OBU device carries out map matching on the relationship between the position information of the vehicle and an urban road map in real time according to the positioning data of the vehicle, the lane number of the vehicle is calculated, the relative distance between the vehicle and the special vehicle is calculated according to the position data of the special vehicle, whether the vehicle is in the same lane of the special vehicle or not is judged, and the result is stored in the vehicle-mounted OBU.

4. The method for preferential passage of vehicles according to claim 3, based on V2X, further comprising: and step six, the vehicle-mounted OBU device on the social vehicle forms prompt information by the relative distance and the position data and displays the prompt information on a display terminal.

5. The V2X-based vehicle priority passing method according to claim 4, wherein in the sixth step, the social vehicle forms prompting information including vehicle speed of the special vehicle, lane number, estimated arrival time, relative distance between the special vehicle and the vehicle, and lane number of the vehicle.

6. The V2X-based vehicle priority passing method according to claim 4, wherein when the social vehicle displays the prompting message, if the social vehicle and the special vehicle are in the same lane, the prompting message "distance you have-the special vehicle, lane number is-" and your current lane is-please pay attention to lane change for avoiding "; if the vehicle is located in different lanes, prompt information of distance between a user and a special vehicle, lane number between the user and the current lane, and lane change at will is displayed through the display terminal.

7. The V2X-based vehicle priority passing method according to claim 4, wherein when the social vehicle displays the prompting message, if the social vehicle is in a different lane from the special vehicle, the prompting message "there is a special vehicle, the lane number is-," the current lane is-, "don't change lane at will" is displayed through the display terminal, then the process goes to step five to repeat, and the special vehicle position data from the special vehicle is continuously received through V2X communication.

8. The V2X-based vehicle priority passing system according to claim 2, wherein an onboard GPS device on the special vehicle periodically collects the vehicle location data, an onboard OBU device on the special vehicle continuously analyzes the location, speed, advancing direction and lane number of the vehicle and transmits the vehicle location data in V2X communication; and the on-board OBU device on the social vehicle continuously receives the signals and continuously makes calculation until the special vehicle reaches the destination.

Technical Field

The invention relates to the field of car networking, in particular to a vehicle priority passing system and method based on V2X.

Background

At the present stage, urban traffic congestion in China is more and more serious, and special vehicles such as ambulances, fire trucks, police cars and the like are used as important transportation tools for handling emergency events, and are often limited by current road congestion in the process of emergency rescue, so that rapid driving cannot be carried out, rescue delay is caused, and even safety accidents occur. Therefore, the method has important significance for researching the prior passing mode of the special vehicle and improving the passing efficiency and safety of the special vehicle. The hot spot and difficulty of research in recent years is how to reduce the adverse effect of special vehicles on the conventional traffic flow of society while improving the operation efficiency, reliability and safety of vehicles running in time, such as ambulances, fire trucks, police cars and the like, which should provide services for preferential passage.

At present, the most common method for the prior passage of special vehicles is to install a whistle on the special vehicle, and to remind other vehicles on a road to avoid by whistling a whistle, so that the effect of enabling the special vehicle to pass preferentially is achieved.

The disadvantages of this solution are: the whistle generated by the whistle device of the special vehicle has a small propagation range. For other social vehicles, the whistle can be heard only when the special vehicle is close to the self, and the vehicle is avoided at the moment, so that a certain time is required, and the running speed of the special vehicle of the rear vehicle is still influenced.

The second disadvantage is that: ordinary social personnel sometimes can not judge which kind of special vehicle is behind through the sound of whistling to produce the negative mood of dodging of heart.

A special vehicle priority passing system and method based on V2X technology also appears, for example, a special vehicle priority passing system and method based on V2X technology in CN107170258A patent document, which includes: the special vehicle-mounted positioning device comprises a positioning unit arranged on a special vehicle, a road side unit arranged on the road side of a crossroad and a traffic light control unit, and achieves the purpose of enabling the special vehicle to pass preferentially by controlling traffic light of a lane where the special vehicle is located.

The disadvantages of this solution are: the software algorithms are too complex. And the road side unit is used for judging the lane where the special vehicle is located and the position of the lane where the special vehicle is located according to the current position of the special vehicle, generating a control instruction of the traffic light, and transmitting the control instruction to the traffic light unit. Because the running speed of the vehicle is limited by the current dynamic traffic condition, the accurate time point of the special vehicle reaching the intersection can be difficultly estimated accurately, and finally, the light control decision is inaccurate, so that the aim of assisting the special vehicle to pass preferentially is difficultly fulfilled.

The second disadvantage is that: the scheme considers that the purpose of preferential passage of special vehicles is achieved by controlling traffic state lamps at the crossroads. However, in most cases, the special vehicle may be blocked by other vehicles at a place other than the intersection, so that the solution has a limited effect on the preferential passage of the special vehicle.

V2X (V2 Xvehicle to evolution) refers to the exchange of information from vehicle to outside, and is a generic term of a series of vehicle-mounted communication technologies. V2X includes car-to-car (V2V), car-to-roadside equipment (V2R), car-to-infrastructure (V2I), car-to-pedestrian (V2P), car-to-locomotive (V2M), and car-to-bus (V2T).

The OBU (on board Unit) refers to a vehicle-mounted unit, and adopts DSRC (dedicated Short Range communication) technology to communicate with the RSU.

At present, V2X communication mode between an RSU and a vehicle-mounted OBU mainly adopts DSRC technology, DSRC (dedicated short-range communication technology) is efficient short-range wireless communication technology, the DSRC has a special frequency band, and a 75MHz bandwidth located in a 5.9GHz frequency band is divided into special traffic safety spectrum of the DSRC. This is different from some common other communication protocols. For example, Wi-Fi, bluetooth and Zigbee share an open 2.4Ghz band, and thus are not interfered by other signals in the current area or generate congestion. The system can realize the identification and bidirectional communication of moving targets in high-speed motion in a specific small area, and can transmit image, voice and data information in real time.

Disclosure of Invention

In view of the present situation, the embodiment of the invention provides a more effective way for assisting special vehicles to pass preferentially. The method is easy to realize, does not depend on a complex software algorithm, and can play an obvious auxiliary role in preferential passage of special vehicles.

In order to solve the technical problems, the invention adopts the following technical scheme: a vehicle priority passing system based on V2X comprises: set up on the special vehicle on-vehicle OBU terminal, set up the on-vehicle GPS device of positioning unit on the special vehicle, set up on-vehicle OBU terminal on the social vehicle, set up on-vehicle GPS device on the social vehicle, wherein:

the vehicle-mounted GPS device is used for acquiring the position of a vehicle at regular time and sending the position information of the vehicle to the vehicle-mounted OBU device;

and the vehicle-mounted OBU device is used for processing the position information received by the vehicle-mounted GPS, judging the lane where the vehicle is located and the position information of the lane where the vehicle is located, converting the vehicle GPS information and the lane number into signals and sending the signals to other vehicles in a V2X communication mode.

Preferably, the special vehicle position data includes a lane number and a position, a speed, and a heading direction of the own vehicle. Among them, the current V2X technology uses the DRSC technology to perform wireless communication, and the signal range is about 1000 meters.

A priority passing method of a vehicle based on V2X comprises the following steps:

firstly, collecting map information to make a map file, and loading the map file into vehicle-mounted OBU terminals of special vehicles and social vehicles;

secondly, the vehicle-mounted OBU terminal on the special vehicle acquires the GPS positioning data information of the vehicle from the GPS device of the vehicle;

thirdly, the vehicle-mounted OBU terminal on the special vehicle judges the relation between the position information of the GPS and a map in a map file in real time, map matching is carried out according to the vehicle positioning data, and the lane number of the special vehicle is calculated;

fourthly, the vehicle-mounted OBU terminal of the special vehicle stores the position data of the special vehicle in a vehicle-mounted OBU device of the special vehicle, and continuously sends the position data of the special vehicle to other social vehicles in the same road section outwards in a V2X communication mode;

after the social vehicle receives the lane number of the special vehicle in a V2X communication mode, a vehicle-mounted GPS device on the social vehicle acquires vehicle GPS positioning data information and sends the positioning data to a vehicle-mounted OBU device, the vehicle-mounted OBU device carries out map matching on the relationship between the vehicle position information and an urban road map in real time according to the vehicle positioning data to calculate the lane number of the vehicle, and meanwhile, the relative distance between the vehicle and the special vehicle is calculated according to the position data of the special vehicle to judge whether the vehicle is located on the same lane of the special vehicle or not, and the result is stored in the vehicle-mounted OBU;

and step six, the vehicle-mounted OBU device on the social vehicle forms prompt information by the relative distance and the position data and displays the prompt information on a display terminal.

When the social vehicle displays the prompt information, if the social vehicle and the special vehicle are located in the same lane, the prompt information of distance from the special vehicle to the special vehicle, lane number of the special vehicle, and lane number of the current lane to please pay attention to lane change for avoiding is displayed through the display terminal. "; if the vehicle is located in different lanes, prompt information of distance from a user to a special vehicle, lane number of the vehicle, current lane number of the vehicle and the like is displayed through the display terminal, and the user does not change lanes randomly. ".

If the social vehicle and the special vehicle are in different lanes, the display terminal displays prompt information of distance, existence, lane number and current lane number, and the user does not change lanes randomly. ", then the process proceeds to step five and repeats, and the special vehicle position data from the special vehicle is continuously received by way of the V2X communication.

Preferably, the vehicle-mounted GPS device on the special vehicle collects the positioning data of the vehicle at regular time, the vehicle-mounted OBU device on the special vehicle continuously analyzes the position, the speed, the advancing direction and the lane number of the vehicle, and the position data of the special vehicle of the vehicle is sent in a V2X communication mode; and the on-board OBU device on the social vehicle continuously receives the signals and continuously makes calculation until the special vehicle reaches the destination.

The technical scheme of the invention has the following beneficial effects:

the vehicle priority passing system and method based on V2X provided by the embodiment of the invention are used for judging the lane where the special vehicle is located and the position of the lane based on the current position of the special vehicle. The special vehicle OBU obtains the GPS positioning data of the vehicle from the inertial navigation system of the vehicle, and then continuously sends the GPS positioning data of the vehicle and the number of the lane where the vehicle is located to other social vehicles in the road section through V2X communication. And after other social vehicles acquire the information, the information is displayed through the vehicle-mounted OBU display terminal. The vehicle owner can obtain the current position and the lane number of the special vehicle through the vehicle-mounted OBU in real time, and the vehicle owner can give way in advance to give the special vehicle priority to pass. The method is easy to realize, does not depend on a complex software algorithm, and can play an obvious auxiliary role in preferential passage of special vehicles.

Drawings

FIG. 1 is a schematic structural diagram of a vehicle priority passing system based on V2X according to an embodiment of the present invention;

FIG. 2 is a lane number diagram of a vehicle priority passing method based on V2X according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart of a vehicle priority passing method based on V2X according to an embodiment of the present invention;

FIG. 4 is a data processing flow chart of a vehicle priority passing method based on V2X according to an embodiment of the invention;

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 is a schematic structural diagram of a vehicle priority passing system based on V2X according to an embodiment of the present invention.

The system comprises: the vehicle-mounted OBU device comprises a vehicle-mounted GPS device 1 arranged on a special vehicle, a vehicle-mounted OBU device 2 arranged on the special vehicle, a vehicle-mounted OBU device 3 arranged on a social vehicle, a vehicle-mounted GPS device 4 arranged on the social vehicle and a display terminal 5, wherein the vehicle-mounted OBU device 2 arranged on the special vehicle and the vehicle-mounted OBU device 3 arranged on the social vehicle are communicated in a V2X mode.

In the embodiment, when the special vehicle enters the road range, the vehicle-mounted GPS device 1 arranged on the special vehicle regularly collects the current positioning data of the vehicle;

in the embodiment of the invention, the vehicle-mounted GPS device 1 can acquire the current position of the special vehicle through a high-precision GPS locator and send the current positioning data of the special vehicle to the vehicle-mounted OBU device 2 arranged on the special vehicle;

in this embodiment, after the on-board OBU device 2 acquires the GPS positioning data information of the vehicle, the on-board OBU device 2 of the special vehicle determines the relationship between the position information of the vehicle GPS and the urban road map in real time, performs map matching according to the vehicle positioning data, and calculates the lane number of the special vehicle, the position, speed, and advancing direction of the vehicle.

In this embodiment, the own vehicle GPS data information acquired by the special vehicle OBU device 2 includes: the position, speed, direction of travel of the vehicle itself.

In the embodiment, the special vehicle sends the vehicle GPS positioning data and the lane number to other social vehicles in the same road section through the vehicle-mounted OBU device 2 in a V2X communication mode;

in the embodiment, other social vehicles in the V2X communication range of the special vehicle receive special vehicle position data sent by the special vehicle through the vehicle-mounted OBU device 3, wherein the special vehicle position data comprises the lane number, the position, the speed, the advancing direction and the like of the special vehicle and are stored in the vehicle-mounted OBU terminal;

in this embodiment, the own vehicle GPS positioning data information acquired by the onboard GPS device 4 on the social vehicle includes: after the positioning data in the position, speed and advancing direction information of the vehicle is sent to the vehicle-mounted OBU device 3 on the social vehicle, the vehicle-mounted OBU device 3 judges the relation between the position information of the GPS of the vehicle and an urban road map in real time, and carries out map matching according to the positioning data of the vehicle to calculate the number of the lane where the vehicle is located. Meanwhile, the vehicle-mounted OBU device 3 on the social vehicle receives the position data of the special vehicle from the special vehicle, including the lane number of the special vehicle, the position, the speed, the advancing direction and the like of the vehicle, calculates the relative distance between the special vehicle and the vehicle, and forms prompt information to be displayed on the display terminal 5.

In this embodiment, the social vehicle OBU3 analyzes the position and lane number of the vehicle, determines whether the vehicle is in the same lane of the special vehicle, and if the vehicle is in the same lane, displays a prompt message "you are in the same lane with the special vehicle 120 and are 100 meters away from the special vehicle, and please pay attention to lane change for avoiding. "; if the vehicle is in a different lane, a prompt message of 120 special vehicles away from 100 m, the number of the lane is No. 5, the current lane is 1 and the vehicle does not change lanes randomly is displayed through the display terminal. ".

The embodiment of the invention provides a vehicle priority passing system based on V2X, which comprises: the system comprises an on-board OBU terminal 1 arranged on a special vehicle, an on-board GPS device 2 of a positioning unit arranged on the special vehicle, an on-board OBU terminal 3 arranged on a social vehicle and an on-board GPS device 4 arranged on the social vehicle, wherein: the vehicle-mounted GPS device 2 on the special vehicle regularly collects the positioning data of the vehicle, the vehicle-mounted OBU device 1 on the special vehicle continuously analyzes the position and the lane number of the vehicle, and sends the position information and the lane number of the vehicle in a V2X communication mode;

the social vehicles in the communication range of V2X can continuously receive the information sent by the special vehicle, and after the social vehicles analyze the received information, the vehicle-mounted OBU device 3 analyzes the relative positions of the special vehicle and the vehicle and whether the lane numbers are consistent or not, and judges whether lane change is required to be avoided or not. By adopting the mode, no other social vehicles occupy the road in the communication range of the special vehicle V2X, and the special vehicle can smoothly reach the destination.

The special vehicle priority passing scheme provided by the embodiment of the invention judges the lane where the special vehicle is located and the position of the lane based on the current position of the special vehicle, generates related signals based on the position of the special vehicle on the lane, and sends the signals to other social vehicles on a road section in a V2X communication mode.

Fig. 3 is a vehicle priority passing method based on V2X, which is applied to a vehicle priority passing system based on V2X and provided by the embodiment of the present invention, and the method specifically includes the following steps:

and step S1, the vehicle-mounted OBU terminal deploys track data of all lanes of the urban road in advance and makes map information.

The map information production process comprises the following steps: 1) acquiring track data of each lane in an urban road section area;

2) making the collected track data into a map file;

the map file contains the lane numbers, and the lane numbers involved, as shown in fig. 2.

All lanes start from 1, and each lane is numbered according to the driving-in and driving-out directions of vehicles in four directions of south, east and west. For example, the following is a method of numbering road lanes using a bidirectional two-lane example:

east-ward direction (E): the number of the vehicle driving-in direction lane is 1, and the number of the vehicle driving-out direction lane is 2;

true south direction (S): the number of the lane in the vehicle driving-in direction is 3, and the number of the lane in the vehicle driving-out direction is 4;

positive west direction (W): the number of the vehicle driving-in direction lane is 5, and the number of the vehicle driving-out direction lane is 6;

north direction (N): the vehicle entrance direction lane number is 7, and the vehicle exit direction lane number is 8.

Of course, the four and six bidirectional lanes may be numbered sequentially.

Step S2, importing the prepared map file into the vehicle-mounted OBU device 2 of the special vehicle and the vehicle-mounted OBU device 3 on the social vehicle;

step S3, when the special vehicle enters the road range, the vehicle-mounted GPS device 1 arranged on the special vehicle regularly collects the current positioning data of the vehicle, specifically, the high-precision GPS locator is used for collecting the current positioning data of the vehicle;

step S4, the vehicle-mounted GPS device 1 sends the current location data of the special vehicle to the vehicle-mounted OBU device 2 provided on the special vehicle, and the location data information includes: the position, speed, and heading of the vehicle itself;

step S5, after the vehicle-mounted OBU device 2 acquires the GPS positioning data information of the vehicle, the vehicle-mounted OBU device 2 of the special vehicle determines in real time that the position information of the vehicle GPS is compared with a map file stored in advance in the vehicle-mounted OBU device, matches the position, calculates the lane number of the special vehicle, and obtains the position data of the special vehicle.

And comparing the position data of the vehicle obtained from the vehicle-mounted GPS device 1 of the special vehicle with a map file stored in advance in a vehicle-mounted OBU device, matching the position, and calculating the lane number of the special vehicle.

Step S6, the vehicle-mounted OBU terminal of the special vehicle stores the position data of the special vehicle in the vehicle-mounted OBU device of the special vehicle, and continuously sends the position data of the special vehicle to other social vehicles in the same road section outwards in a V2X communication mode; the special vehicle position data comprises: the speed, position, running direction and lane number of the special vehicle;

step S7, other social vehicles in the communication range of the special vehicle V2X receive the special vehicle position data sent by the special vehicle through the vehicle-mounted OBU device 3;

in step S8, the GPS positioning data information of the host vehicle acquired by the onboard GPS device 4 on the social vehicle includes: after positioning data in the position, speed and advancing direction information of the vehicle is sent to the vehicle-mounted OBU device 3, the vehicle-mounted OBU device 3 judges the relation between the position information of the GPS of the vehicle and an urban road map in real time, carries out map matching according to the positioning data of the vehicle, calculates the lane number of the vehicle, calculates the relative distance between the vehicle and the special vehicle according to the position data of the special vehicle, judges whether the vehicle is positioned on the same lane of the special vehicle or not, and stores the result in the vehicle-mounted OBU;

the judging method comprises the following steps: calling a lane number of the vehicle and a received lane number of the special vehicle, and comparing the two lane numbers with each other; if the lane number of the vehicle is equal to the lane number of the special vehicle, the comparison result is as follows: the special vehicle is positioned in the same lane, and the result is stored; if the lane number of the vehicle is not equal to the lane number of the special vehicle, the comparison result is as follows: storing the result when the special vehicle is not in the same lane;

step S9, the social vehicle OBU device displays the prompt information on the display terminal 5 according to the stored comparison result: if the social vehicle and the special vehicle are in the same lane, a prompt message that the social vehicle and the special vehicle 120 are in the same lane and are 100 meters away from each other is displayed through the display terminal 5, and the user is reminded to change lanes to avoid the special vehicle. "; if the vehicle is in a different lane, a prompt message of 120 special vehicles away from 100 m, the lane number is B, the current lane is A and the vehicle does not change lanes randomly is displayed through the display terminal 5. ".

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.