JP5151749B2 - Road-to-vehicle communication system, in-vehicle device, center, road-to-vehicle communication method and program - Google Patents

Description

  The present invention relates to a road-to-vehicle communication system, an in-vehicle device, a center, a road-to-vehicle communication method, and a program suitable for application to vehicles such as passenger cars, trucks, and buses.

  In recent vehicles, the search conditions including the destination entered by the driver and the position of the vehicle detected by GPS (Global Positioning System) or calculated by INS (Inertial Navigation System) In many cases, a car navigation system is mounted as a system that searches for a planned travel route based on the above and guides the driver and assists driving to improve convenience. In such a car navigation system, guidance by a display or voice is performed when guiding information related to a route to a driver.

On the other hand, in recent years when global warming has become a serious problem, movements to reduce carbon dioxide (CO ₂ ), the leading role of greenhouse gases that promote global warming, to prevent global warming even a little. Is spreading worldwide. And in recent years, it has come to have an economic value through the trading of CO ₂ emission rights, etc., and a method for calculating the CO ₂ emission amount and the reduction amount as accurately as possible is desired.

  For example, in the car navigation system described in Patent Document 1, the amount of exhaust gas discharged from a vehicle when traveling along an appropriate route after receiving route guidance and the destination without receiving route guidance. By calculating the difference between the exhaust emission amount of the vehicle and the exhaust gas emission amount when traveling on an average travel route, the reduction amount of harmful substances in the exhaust gas when traveling with route guidance is calculated. Techniques to calculate are proposed. Here, the appropriate route is the route with the shortest travel distance and the shortest travel time to the destination selected in consideration of the current road conditions (for example, road construction and traffic jams). Point to.

In such a car navigation system, the amount of exhaust gas discharged by each vehicle is detected (measured) at predetermined times or distances, and the measurement result is transmitted to the center. Based on the actual exhaust gas emission amount in each vehicle, the reduction amount of harmful substances (especially CO ₂ ) contained in the exhaust gas when the vehicle travels with route guidance is calculated quickly and accurately. It has become.
Japanese Patent Laid-Open No. 2003-316884

  However, in such a car navigation system, exhaust gas emissions are measured and transmitted to the center at predetermined timings or timings, for example, roads such as intersections and uphill or downhill roads. Communication is not performed considering the circumstances. Therefore, even when the base environment (road conditions) is different, such as in urban areas where the distance between intersections is short and in the suburbs where the distance between intersections is long, the measurement is performed uniformly at predetermined times and distances. As vehicle information transmitted from the vehicle to the center, information other than the data that the center wants to collect, in other words, unnecessary information is transmitted to the center. As a result, there is a problem that communication is burdened by transmission of unnecessary information.

In addition, in the case of such a car navigation system, although the degree of environmental degradation can be grasped for each region based on vehicle information transmitted from the vehicle, the detection result at every predetermined time and every predetermined distance without considering road conditions. Therefore, for example, in exhaust gas exhausted when traveling on an uphill road, the amount of CO ₂ emission inevitably increases. It is judged on the basis of the same amount of emissions as in the case of traveling at a speed, and may be recognized as a wasteful traveling. This makes it difficult to accurately grasp the degree of environmental degradation.

  By the way, by selecting an area with a large amount of exhaust gas emission, particularly in an urban area, by selecting the area with a large amount of exhaust gas based on the degree of environmental deterioration based on vehicle information (at least position information and information on exhaust gas) transmitted from the vehicle, If there is a large amount of exhaust gas in a certain area at a certain time, it is estimated that the area is congested, that is, congested. That is, the vehicle information transmitted from the vehicle makes it possible to grasp the state of traffic such as the traffic volume and traffic congestion of the vehicle and the degree of air pollution by these vehicles (hereinafter collectively referred to as the environmental state). Such an environmental state can be used as road information for a car navigation system.

  However, in such a car navigation system, vehicle information is transmitted at the timing described above. For example, even if the transmission timing is set on an urban basis, that is, on the basis of the time or distance based on the intersection interval in an urban area, In some cases, it may be a straight road that has nothing to do with the intersection, it may be a winding road, a so-called winding road, and it does not necessarily become information related to traffic volume and traffic jams. It may not be the information that the center wants.

  Accordingly, the transmission timing (condition for transmitting information, that is, the transmission condition) is appropriately changed as necessary. For example, when the degree of environmental deterioration (air pollution) in a certain region is high, the vehicle Is set as a transmission condition that the exhaust gas emission amount in the vehicle exceeds the specified value, and when there is a vehicle that satisfies the above-mentioned conditions in the vicinity, it is also set to transmit from other vehicles around the vehicle that satisfy the condition If possible, it is considered that vehicle information including information related to the environment, that is, related to exhaust gas, can be transmitted to the center based on the above conditions from not only vehicles located in the area but also other vehicles located in the vicinity. . As a result, the content of the vehicle information to be transmitted is composed of desired data to be grasped by the center, and this vehicle information can be collected by the center subject as detection result data. In addition to being able to grasp it, it is considered that the region where the degree of environmental deterioration is higher can grasp that it is a place where there is a lot of traffic and consequently traffic congestion.

  At this time, it is considered that the data desired by the center can be collected accurately if the contents of the data to be collected, the transmission timing, and the like are constrained by conditions. For example, when it is desired to increase the number of data, the conditions may be changed such as increasing the number of vehicles to be detected or increasing the number of transmission points.

  Therefore, the present invention has been made in view of the above-mentioned problems, and can avoid unnecessary transmission and reduce the communication load dramatically, and can accurately collect desired information and provide an accurate environment. The main purpose is to provide a road-to-vehicle communication system, an in-vehicle device, a center, a road-to-vehicle communication method and a program capable of grasping the state.

One aspect of the present invention for achieving the above object is a road-to-vehicle communication system in which a vehicle and a center are communicably connected to each other, and the center receives and accumulates vehicle information transmitted from the vehicle. Vehicle state detection means for detecting the state of the vehicle, and transmission means for transmitting the detection result as the vehicle information when the detection result detected by the vehicle state detection means satisfies a predetermined condition set in advance. A position detecting means for detecting the position of the vehicle, and a setting means for setting a section for detecting the state of the vehicle based on the position of the vehicle, wherein the vehicle state detecting means is set by the setting means. each has been section detects a state of the vehicle continuously, based on the state of the continuously detected vehicle, mounted on the vehicle asking you to detection results And the vehicle-mounted device, to a vehicle existing around the vehicle that has transmitted the vehicle information, and to have an information transmission command means for prompting to send the vehicle information.

  Thus, according to one aspect of the present invention, only the detection result that satisfies the predetermined condition among the detection results detected by the vehicle state detection means is transmitted to the center as vehicle information, so that a necessary event occurs, for example. In this case, by setting a predetermined condition according to the event, it is possible to transmit only information related to the necessary event as vehicle information. Accordingly, it is possible to increase the frequency of transmission (communication) of information (vehicle information) related to a necessary event, and to avoid transmission of unnecessary information that does not satisfy a predetermined condition. That is, unless the necessary event occurs, the communication frequency does not increase, and the communication load can be remarkably reduced. Therefore, the center can accurately collect the desired information by receiving the transmitted vehicle information, and based on the collected vehicle information, the accurate environmental state (the traffic volume of the vehicle, the traffic congestion status, and the The state of the air pollution degree by the vehicle) can be grasped.

  Similarly, the vehicle information related to the required event can be collected from the vehicles (in other words, other vehicles) existing around the vehicle that satisfies the predetermined condition, that is, the vehicle information related to the required event. Therefore, it is possible to collect more vehicle information related to the event, and it is possible to grasp in more detail the surrounding environmental state in the vehicle that originally transmitted the vehicle information.

  Moreover, in one aspect of the present invention, it is desirable that the information transmission command means is provided on the center side. Thereby, the vehicle information regarding a necessary event can be collected by the center entity.

  In the aspect of the invention, the transmission unit may detect the vehicle when the vehicle has reached a predetermined point even if the detection result by the vehicle state detection unit does not satisfy the predetermined condition. The result is transmitted as the vehicle information. Thereby, since vehicle information is transmitted from a vehicle for every predetermined | prescribed point, the center can grasp | ascertain the road condition in each point (that is, transmission point) where the vehicle transmitted vehicle information. Therefore, if the intersection (when the intersection is reached) is selected (set), for example, as the transmission point (in other words, transmission timing), based on the transmitted vehicle information, the traffic volume at each intersection that is the predetermined point, There is an advantage that it is possible to grasp road conditions including traffic conditions related to traffic congestion.

  Furthermore, in one aspect of the present invention, the vehicle includes position detection means for detecting a position of the host vehicle, the vehicle information includes position information based on a detection result of the position detection means, and the transmission means The vehicle information is transmitted even when the position of the vehicle is different from the predetermined point when receiving an instruction from the center to transmit the vehicle information. As a result, vehicle information related to an event that a certain vehicle needs is transmitted, and based on the transmitted vehicle information, vehicle information (that is, other vehicles) located around the vehicle that transmitted the vehicle information is also vehicle information (that is, other vehicle). If it is desired to collect information on necessary events), the vehicle information can be transmitted even if the position of the other vehicle is different from the predetermined point, that is, even if it does not reach the predetermined point. Therefore, more information on the desired (necessary) event can be collected. In other words, the communication frequency of necessary event information can be further increased. Therefore, it is possible to grasp in detail the environmental state of the surrounding area where the vehicle that originally transmitted the vehicle information is located.

  Moreover, in one aspect of the present invention, it is preferable that the vehicle information includes information regarding exhaust gas discharged from the vehicle. Thereby, the air pollution degree (environmental deterioration degree) of the area | region where the vehicle which transmitted vehicle information is located can be grasped | ascertained.

Furthermore, in one embodiment of the present invention, the exhaust gas preferably contains any one of carbon dioxide, nitrogen oxides, and sulfur oxides. As a result, emissions of harmful substances (carbon dioxide, nitrogen oxides, sulfur oxides) contained in exhaust gas can be ascertained, and the environmental impact (air pollution degree) of these harmful substances is also ascertained. In addition, it is possible to accurately calculate the reduction amount of these harmful substances. In particular, with respect to carbon dioxide (CO ₂ ), the amount of CO ₂ reduction can be calculated accurately, so that future utility value such as CO ₂ emission trading can be added.

In one aspect of the present invention, the vehicle state detection means is connected to the center so as to be communicable and is mounted on the vehicle for transmitting vehicle information to the center, and detects the state of the vehicle. And when the detection result detected by the vehicle state detection means satisfies a predetermined condition set in advance, a transmission means for transmitting the detection result as vehicle information, a position detection means for detecting the position of the vehicle, Setting means for setting a section for detecting the state of the vehicle based on the position of the vehicle , wherein the vehicle state detecting means continuously maintains the state of the vehicle for each section set by the setting means. and it detects in, based on the state of the continuously detected vehicle obtains the detection result, the transmission unit, the information transmission command prompting from the outside to send the vehicle information Kicking the was to send the vehicle information.

  Therefore, according to the aspect of the present invention, only the detection result that satisfies the predetermined condition among the detection results detected by the vehicle state detection unit is transmitted to the center as vehicle information, and thus, for example, a necessary event has occurred. In this case, by setting a predetermined condition according to the event, only information related to the necessary event can be transmitted as vehicle information. Accordingly, it is possible to increase the frequency of transmission (communication) of information (vehicle information) related to a necessary event, and to avoid transmission of unnecessary information that does not satisfy a predetermined condition. That is, unless the necessary event occurs, the communication frequency does not increase, and the communication load can be remarkably reduced. Similarly, vehicle information related to a required event can be transmitted from a vehicle (in other words, another vehicle) existing around the vehicle that satisfies the predetermined condition, that is, the vehicle information related to the required event. Therefore, the center can collect more vehicle information related to the event, and at the same time, it can make the surrounding environmental state of the vehicle that transmitted the vehicle information more detailed.

  Moreover, in one aspect of the present invention, when the vehicle has reached a predetermined point, the transmission unit detects the detection even if the detection result by the vehicle state detection unit does not satisfy the predetermined condition. Since the result is transmitted as the vehicle information, the vehicle information is transmitted every time the vehicle reaches the predetermined point. Therefore, the road at each point where the vehicle information is transmitted to the center (in other words, the transmission point) Information about the situation can be provided. Therefore, if, for example, an intersection (at the time of arrival at the intersection) is selected (set) as the transmission point (in other words, transmission timing), based on the vehicle information to be transmitted, the traffic volume and traffic congestion at each intersection that is the transmission point There is an advantage that environmental information including the traffic state can be provided.

Furthermore, in one aspect of the present invention, the center is connected to be communicable with a vehicle and receives and accumulates vehicle information transmitted from the vehicle, and is set based on the position of the vehicle in the vehicle. For each section in which the vehicle state is detected, the vehicle state is continuously detected, and the detected state of the vehicle is obtained based on the continuously detected vehicle state. When the result satisfies a predetermined condition set in advance, the detection result is transmitted as vehicle information, and the vehicle information is transmitted to other vehicles existing around the vehicle that transmitted the vehicle information. The information transmission command means for prompting the user is provided.

  Therefore, according to one aspect of the present invention, only the detection result that satisfies the predetermined condition among the detection results detected by the vehicle is transmitted as the vehicle information. For example, when a necessary event occurs, the event By setting the predetermined condition according to the above, only information relating to the necessary event can be received as vehicle information. This makes it possible to receive more information (vehicle information) related to necessary events, in other words, it is possible to increase the frequency of transmission (communication) of desired vehicle information, and to transmit unnecessary information that does not satisfy a predetermined condition. Can be avoided. That is, unless the necessary event occurs, the communication frequency does not increase, and the communication load can be remarkably reduced. Therefore, by receiving the transmitted vehicle information, it is possible to accurately collect the desired information, and based on the collected vehicle information, the accurate environmental state (the traffic volume and traffic conditions of the vehicle and the vehicle Status of air pollution).

  In addition, since it has information transmission command means, vehicle information related to the necessary event is collected in the same manner from other vehicles that meet the predetermined condition, that is, around the vehicle that transmitted the vehicle information related to the necessary event. It is possible to collect more vehicle information related to the event, and it is possible to grasp in more detail the surrounding environmental condition in the vehicle that originally transmitted the vehicle information. In other words, by providing the information transmission command means on the center side, vehicle information relating to necessary events can be collected by the center entity.

In one embodiment of the present invention, the vehicle and the center are communicably connected to each other, the vehicle transmits vehicle information to the center, and the center receives and accumulates vehicle information transmitted from the vehicle. a road-to-vehicle communication method, a position detection step for detecting a position of said vehicle, based on the position of the vehicle, a setting step of setting a period for detecting the state of the vehicle, has been set by the setting step for each section, and it detects the state of the vehicle continuously, based on the state of the continuously detected vehicle, and the vehicle state detection step asking you to detection results detected by said vehicle state detection step If the detection result satisfies a predetermined condition set in advance, a transmission step of transmitting the detection result as the vehicle information, and other vehicles existing around the vehicle that transmitted the vehicle information, And to have an information transmission command process to prompt to transmit said vehicle information.

  Therefore, according to one aspect of the present invention, only the detection result that satisfies the predetermined condition among the detection results detected by the vehicle is transmitted as the vehicle information. For example, when a necessary event occurs, the event By setting a predetermined condition according to the above, only information relating to a necessary event can be transmitted as vehicle information. This makes it possible to collect more information (vehicle information) related to necessary events. In other words, it is possible to increase the frequency of transmission (communication) of desired vehicle information, and to avoid transmission of unnecessary information that does not satisfy the predetermined condition. That is, unless the necessary event occurs, the communication frequency does not increase, and the communication load can be remarkably reduced. Therefore, by receiving the transmitted vehicle information, it is possible to accurately collect the desired information, and based on the collected vehicle information, the accurate environmental state (the traffic volume and traffic conditions of the vehicle and the vehicle Status of air pollution).

  Furthermore, the vehicle information related to the necessary event can be collected from other vehicles in the vicinity of the vehicle that satisfies the predetermined condition, that is, the vehicle information related to the necessary event is transmitted. In addition to collecting more information, it is possible to grasp in more detail the surrounding environmental conditions in the vehicle that originally transmitted the vehicle information.

  Moreover, according to one aspect of the present invention, it is preferable that the information transmission instruction step is executed on the center side. Thereby, the vehicle information regarding a necessary event can be collected by the center entity.

  In the aspect of the invention, in the transmission step, the vehicle reaches a predetermined point even if the detection result detected in the vehicle state detection step does not satisfy the predetermined condition. In this case, it is preferable to transmit the vehicle information. Thereby, since vehicle information is transmitted from a vehicle for every predetermined | prescribed point, the center can grasp | ascertain the road condition in each point (that is, transmission point) where the vehicle transmitted the said vehicle information. Therefore, if, for example, an intersection (at the time of arrival at the intersection) is selected (set) as the transmission point (in other words, transmission timing), based on the vehicle information transmitted, the traffic volume and traffic congestion at each intersection as the transmission point There is an advantage that it is possible to grasp road conditions including traffic conditions related to the situation.

  And in one mode of the present invention, it has a self-vehicle position detection process of detecting the position of the vehicle, and the vehicle information includes position information based on a detection result in the self-vehicle position detection process, When receiving an instruction to transmit the vehicle information from the center, it is preferable to transmit the vehicle information even if the position of the vehicle is different from the predetermined point. Accordingly, vehicle information related to an event that a certain vehicle needs is transmitted, and based on the transmitted vehicle information, the vehicle information (that is, necessary information) is also obtained from other vehicles located around the vehicle that transmitted the vehicle information. Event information), the vehicle information can be transmitted even if the other vehicle has not reached the predetermined transmission point, so the frequency of communication of desired (necessary) event information is further increased. be able to. Therefore, it is possible to grasp in detail the environmental state of the surrounding area where the vehicle that originally transmitted the vehicle information is located.

  In one embodiment of the present invention, it is preferable to cause a computer to execute any of the methods described above. Therefore, according to one embodiment of the present invention, a computer program having the above-described operation can be realized.

  According to the present invention, among the detection results detected by the vehicle state detection means, only the detection result that satisfies the predetermined condition is transmitted to the center as the vehicle information, so that unnecessary information that does not satisfy the predetermined condition is transmitted in advance. Can be avoided. Accordingly, the center can accurately collect desired information by receiving the transmitted vehicle information. Thus, unnecessary transmission can be avoided in advance and communication load can be remarkably reduced, and the road-to-vehicle communication system, in-vehicle device, and center capable of accurately collecting desired information and grasping the accurate environmental state A road-to-vehicle communication method and program can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

[First Example]
FIG. 1 is a schematic diagram showing an embodiment of a road-to-vehicle communication system according to the present invention. FIG. 2 is a schematic diagram showing a configuration of a vehicle side in an embodiment of the road-to-vehicle communication system according to the present invention. . FIG. 3 is a schematic diagram showing a specific example of a measurement section applied to an embodiment of a road-vehicle communication system according to the present invention.

  FIG. 4 is a schematic diagram showing a specific example of data in an embodiment of the road-to-vehicle communication system according to the present invention, and FIG. 5 is a road side configuration of the embodiment of the road-to-vehicle communication system according to the present invention. It is a schematic diagram which shows. FIG. 6 is a schematic diagram showing a specific example of the route and measurement section applied to the embodiment of the road-to-vehicle communication system according to the present invention, and accumulated emission data.

  As shown in FIG. 1, the road-to-vehicle communication system 1 in this embodiment includes a car navigation ECU (Electronic Control Unit) 21 that constitutes an in-vehicle device provided in a plurality of vehicles 2 and an information transmission command provided in the center 3. A server 31 as means and a base station 4 are provided. The server 31 and the base station 4 are connected via the network NW, and the car navigation ECU 21 is configured to be able to communicate with the base station 4 connected to the network NW wirelessly or by wire.

  The network NW is, for example, a public switched telephone network (PSTN), a digital communication network (ISDN), a cable such as an optical fiber, a mobile phone network, a PHS (Personal Handy-phone System) network, a wireless LAN (Local Area Network). ) Network, WiMAX (Worldwide Interoperability for Microwave Access) network, satellite phone, beacon and the like.

  Note that the communication between the server 31 and the car navigation ECU 21 via the network NW follows the PPP protocol (Point to Point Protocol), and establishes a data link between them by the PPP protocol. Protocol (Transmission Control Protocol / Internet Protocol), HTTP (Hyper Text Transfer Protocol) that is upwardly compatible with TCP / IP, and FTP (File Transfer Protocol) are realized, and the Internet and WAN (Wide Area Network) are constructed. Thus, transmission / reception of data between the server 31 and the car navigation ECU 21 is enabled.

  Next, the car navigation ECU 21 on the vehicle 2 side will be described in detail with reference to the drawings. FIG. 2 is a schematic diagram showing an embodiment of the car navigation ECU 21 that forms part of the road-vehicle communication system 1.

As shown in FIG. 2, the car navigation ECU 21 includes a GPS (Global Positioning System) antenna 5, a yaw rate sensor 6, a steering sensor 7, a receiver 8, a database 9, and a display 10. An exhaust gas sensor 11 that is installed in an exhaust manifold of an engine (not shown) and detects the concentration of harmful substances in the exhaust gas such as CO ₂ , NO _X , and SO _X is connected. Here, the yaw rate sensor 6, the steering sensor 7, and the exhaust gas sensor 11 constitute vehicle state detection means for detecting the state of the vehicle 2.

  Further, an engine ECU 12, an ABS (Anti Lock Brake System) 13, and a communication device 14 as a transmission unit are connected to the car navigation ECU 21 according to a communication standard such as CAN (Controller Area Network).

  The car navigation ECU 21 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a data bus that connects them to each other, and an input / output interface. According to the stored program, it functions as a search unit 21a, a display unit 21b, a setting unit 21c, a measurement unit 21d, a calculation unit 21e, and a transmission unit 21f that perform respective controls described below.

  The GPS antenna 5 receives radio waves from three satellites among a plurality of satellites launched above the earth. Then, based on the radio waves of these satellites, the search unit 21a, which is a position detection unit of the car navigation ECU 21, measures the current position P where the vehicle 2 is located, that is, the longitude and latitude, for example, based on the principle of triangulation. It has become. The search unit 21a uses four satellites when measuring altitude in addition to the longitude and latitude.

  Here, the yaw rate sensor 6 detects the yaw rate of the vehicle 2, and the steering sensor 7 is provided in a steering device (not shown) of the vehicle 2 to detect a steering angle. The database 9 is configured by a storage medium such as a CD-ROM, DVD-ROM, or HDD (Hard Disk Drive), and stores and stores map information for display and map information for search, and a measurement unit. Information about the exhaust gas measured by 21d is also stored.

  In addition, the display 10 is configured by a so-called touch panel type, and when the driver selects any one of the destination Pg, the presence / absence of use of the expressway, the shortest distance or the shortest time, and other various search conditions are input. It also functions as an input device. At the same time, the display 10 displays information on the route searched by the search unit 21a of the car navigation ECU 21 based on the search map information based on the destination Pg and the search conditions input by the driver. It also has a function of displaying together with display map information based on a command from the display unit 21b.

  The ABS 13 is a device that prevents a wheel from being locked during braking. The ABS 13 measures a vehicle speed for use in the control by a wheel speed sensor (not shown), and the measured vehicle speed is determined from the ABS 13 according to a communication standard such as CAN. It is transmitted to the car navigation ECU 21.

  Further, the receiver 8 is compliant with light or radio wave beacons, and receives road information including traffic jam information transmitted from a VICS (Vehicle Information and Communication System).

  Thus, the search unit 21a of the car navigation ECU 21 calculates the moving distance and direction of the vehicle 2 based on the vehicle speed measured from the ABS 13, the yaw rate detected by the yaw rate sensor 6, and the steering angle detected by the steering sensor 7. Thus, the current position P of the vehicle 2 is measured by INS (Inertial Navigation System). Therefore, for example, when the vehicle 2 is located between high-rise buildings or in a tunnel and it is difficult to receive radio waves from the satellite by the GPS antenna 5, the search unit 21a performs the vehicle as described above. 2's current position P is complemented.

  The display unit 21b of the car navigation ECU 21 displays the map information for display in the database 9, the current position P of the vehicle 2 measured by the above-described method, and the destination Pg input by the touch panel, that is, the display 10. And information related to the route searched by the search unit 21a are displayed on the display 10 together.

  Here, the engine ECU 12 includes, for example, a CPU, a ROM, a RAM, and a data bus and an input / output interface that interconnect them. According to a program stored in the ROM, an engine fuel injection amount, a throttle opening, While controlling valve lift amount, valve timing, engine speed, etc., these control information is transmitted to the measurement part 21d of car navigation ECU21 via CAN.

  Furthermore, the setting unit 21c of the car navigation ECU 21 sets a threshold value as a predetermined condition in advance for the exhaust gas emission amount measured by the measurement unit 21d, which is one of the vehicle state detection means, based on an instruction from the center 3 described later. At this time, an instruction from the center 3 is given when a necessary event occurs in the center 3, and vehicle information to be transmitted later to the center 3 according to the conditions determined by this instruction is desired by the center 3 (that is, In other words, the frequency of transmitting unnecessary vehicle information is reduced and the frequency of transmitting required vehicle information is increased.

  Further, for example, when the current position P of the vehicle reaches the nearest intersection Px on the route searched by the search means 21a, the setting unit 21c determines the intersection Px + 1 adjacent to the nearest intersection Px on the route. The connecting road is set to the measurement section Zx. For example, when the route is as shown in FIG. 3, when reaching the intersection P1, the setting unit 21c sets a road connecting the intersection P1 and the adjacent intersection P2 on the route as the measurement section Z1. Similarly, when the intersection P2 is reached, a road connecting the intersection P2 and the intersection P3 (not shown) adjacent to the route is set as the measurement section Z2, and when the intersection Pn-1 is reached, the intersection adjacent to the intersection Pn-1 on the route is set. A road connecting Pn is set as the measurement section Zn-1.

  In addition to this, the measurement unit 21d of the car navigation ECU 21 uses the detection result of the exhaust gas sensor 11 and the control information transmitted by the engine ECU 12 by CAN as information related to the exhaust gas discharged from the vehicle. Actually and continuously measured on the car for each section.

Further, the calculation unit 21e of the car navigation ECU 21 causes the vehicle to travel in the corresponding measurement section Zx by a value obtained by multiplying the detection result of the exhaust gas sensor 11, that is, the exhaust gas concentration, with the engine exhaust amount within a predetermined unit time. The exhaust gas emission amount Vx of the vehicle in each measurement section is directly calculated and is indirectly calculated by a theoretical formula determined in advance based on the control information transmitted from the engine ECU 12 by the CAN. Exhaust gas emissions Vx, more specifically, emissions of carbon dioxide (CO ₂ ), nitrogen oxides (NO _x ), and sulfur oxides (SO _x ), which are harmful substances in exhaust gases (especially in the present embodiment) Then, the amount of CO ₂ emission) is calculated.

  Note that the calculation unit 21e of the car navigation ECU 21 calculates the exhaust gas emission amount Vx as the exhaust gas emission amount Vx when the exhaust gas sensor 11 is operating normally, based on the detection result of the former exhaust gas sensor 11. When the exhaust gas sensor 11 fails using the exhaust amount Vx, the exhaust gas exhaust amount Vx based on the latter theoretical formula is used.

  In addition, the transmission unit 21f of the car navigation ECU 21 includes a transmission source ID, a transmission destination ID, an exhaust gas discharge amount Vx, an adjacent intersection that configures the corresponding measurement section Zx and the measurement section. The data shown in FIG. 4 including the positions of Px and Px + 1, adjacent intersections Px and Px + 1, that is, the times Tx and Tx + 1 having passed through the start and end points, is transferred to the intersection Px + 1 at the end of the measurement section. When the current position P matches and the vehicle passes the intersection Px + 1 located at the terminal, the data is transmitted to the server 31 of the center 3 via the CAN and the communication device 14, the base station 4 and the network.

  Here, the timing at which the vehicle passes through the point Px + 1 located at the end of the measurement section and transmits the vehicle information will be described in more detail. The current position of the vehicle is located at the point Px + 1 located at the end of the measurement section. The vehicle information is transmitted at this timing when P matches and the vehicle passes the point Px + 1 located at the end. At this time, the vehicle information is transmitted only when the predetermined condition is satisfied, so that the vehicle information received at the center 3 is the content related to the necessary event, in other words, the vehicle information desired by the center 3. It has become. Thus, in the road-to-vehicle communication system 1, it is possible to prevent vehicle information other than information related to necessary events from being transmitted, so that the communication load can be greatly reduced.

  Next, the server 31 of the center 3 will be described in detail with reference to the drawings. FIG. 5 is a schematic diagram showing the server 31 of the center 3 forming part of the road-vehicle communication system 1 according to the present invention. The server 31 executes control in the center 3 that constitutes a part of the road-vehicle communication system 1 according to the present invention.

  As shown in FIG. 5, the server 31 includes a CPU 71, a main storage device 72, a storage device 73 such as an HDD, a display device 74, an input device 75, a drive device 76, and a communication device 77. Are connected to each other.

  Here, the CPU 71 provides various functions by reading a program such as an OS and an application from the storage device 73 and executing the program, and comprehensively controls processing performed by the server 31. The main storage device 72 is constituted by a RAM, and constitutes a work area for temporarily storing the OS, programs, and data.

  Furthermore, the storage device 73 is a nonvolatile memory such as an HDD or a flash memory, and is transmitted from the OS, the program, the transmission source ID for each vehicle, and the car navigation ECU 21, and is received via the base station 4, the network, and the communication device 77. The vehicle information including the exhaust gas emission amount Vx in each measurement section of each vehicle is stored.

  Note that the HDD stores the map information (road network data) that is stored in the database 9 and is the same as the search map information used by the car navigation ECU 21 in advance, and includes the emission amount Vx accumulated within a certain period. The data is stored based on the comparison between the measurement interval Zx including the data, that is, the start end Px and the end Px + 1.

  Specifically, for example, in the measurement section Zx (x = 1 to n−1) as shown in FIG. 6B set corresponding to the route as shown in FIG. Is assigned for each link whose end is Px + 1, and sums the discharge amount Vx as shown in FIG. 6C for each link to calculate the discharge amount ΣZx for each link within a certain period, or A discharge amount database indicating the discharge amount ΣVx for each link or the discharge amount ΣVx for each vehicle in the fixed period is stored by summing up the discharge amount Vx in the fixed period for each vehicle.

  The display device 74 draws on a display (not shown) such as a liquid crystal with a predetermined resolution, the number of colors, and the like according to a command of the CPU 71 based on screen information instructed by the program. For example, a GUI (Graphical User Interface) A screen is formed, and various windows and data necessary for operation are displayed on the display.

  In addition, the input device 75 includes a keyboard, a mouse, and the like, and is used to input various operation instructions. The drive device 76 is configured such that a storage medium 78 can be inserted, and reads data stored in the storage medium 78 and sends it to the main storage device 72 or the like. The communication device 77 is an interface for connecting to a network such as the Internet or a LAN (Local Area Network), and includes, for example, a modem or a NIC (Network Interface Card).

With this configuration, when the CPU 71 executes the program, the server 31 receives the data (vehicle information) transmitted by the transmission unit 21f of the car navigation ECU 21 described above via the communication device 14, and At the time Tx + 1 when the vehicle 2 passes the intersection Px + 1 located at the end of the measurement section Zx,
Data including the exhaust gas emission amount Vx for each measurement section Zx in the vehicle 2 and the position information of the vehicle 2 is collected in the storage device 73 for each measurement section Zx, and the map information corresponding to the measurement section Zx is collected. Assign to a link.

  That is, the server 31 has a collection function for collecting data (vehicle information) and an assignment function for assigning data to links. Further, the CPU 71 calculates the emission amount ΣVx for each vehicle and the emission amount ΣVx for each road within a certain period by statistical processing, creates an emission amount database, and stores it in the storage device 73. It has become.

  In addition, in the road-vehicle communication system 1 according to the present invention, the vehicle information is transmitted to the center 3 as described above, and the vehicle information received by the communication device 77 at the center 3 is necessary at that time. If it is the vehicle information of the event, the CPU 71 gives an information transmission command for urging the vehicle (other vehicle) located in the vicinity of the vehicle that transmitted the vehicle information to transmit the vehicle information.

  That is, the CPU 71 functions as information transmission command means. As a result, the road-to-vehicle communication system 1 collects the vehicle information related to the necessary event in the same manner from other vehicles existing around the vehicle that has transmitted the vehicle information related to the necessary event that satisfies the above-mentioned threshold value which is a predetermined condition. Therefore, it is possible to collect more vehicle information related to the event, and to have an advantage that it is possible to grasp in more detail the surrounding environmental state of the vehicle that transmitted the vehicle information.

  In addition, in the case of the present embodiment, the CPU 71 as information transmission command means is provided in the server 31 on the center 3 side. Thereby, in the center 3, the vehicle information regarding the said required event can be collected centering on the said center 3. FIG.

  Below, the control content of the road-vehicle communication system 1 in a present Example mentioned above is demonstrated using a flowchart. FIG. 7 is a flowchart showing a vehicle information transmission process which is one of the specific control contents in the road-to-vehicle communication system 1 according to the present invention. In the following description, it should be understood that steps S1 to S15 are simply referred to as S1 to S15 for convenience.

  As shown in FIG. 7, the vehicle information transmission process starts when the vehicle ignition is turned “ON” by the driver's operation. In S <b> 1, the driver uses the display 10 to display the search condition including the destination Pg. In S2, the search unit 21a of the car navigation ECU 21 determines the route from the current position P of the vehicle to the destination Pg, and n intersections Px (x = 1 to n: n depending on the route). Search for a constant. Subsequently, in S3, the search unit 21a of the car navigation ECU 21 sets x = 1.

  Further, in S4, the search unit 21a of the car navigation ECU 21 measures the current position P of the vehicle. In S5, the setting unit 21c of the car navigation ECU 21 sets a road that starts at Px and ends at Px + 1 as a measurement section. Let it be Zx. That is, since x = 1 in the first routine, the road having P1 as the start and P2 as the end is set as the measurement section Z1.

  Subsequently, in S6, the search unit 21a determines whether the current position P when the vehicle further travels on the route has reached the start point Px of the measurement section Zx, and P matches Px, and is affirmative. In this case, the matched time Tx is stored, and the process proceeds to S7, where the measurement unit 21d of the car navigation ECU 21 determines whether Px + 1 is separated from Px by a distance Dth or more and is affirmative. In S8, the information regarding the exhaust gas is actually measured on the vehicle, and when the result is negative, the information regarding the exhaust gas is divided for each distance Dth and actually measured on the vehicle in S9.

  As a result, in regions and foreign countries where the distance between the adjacent intersections Px and Px + 1 is long, the measurement unit of information related to exhaust gas is made appropriate, the processing load on the car navigation ECU 21 is reduced, and information is obtained over a long period of time. The measurement error is prevented from occurring due to noise or the like by continuing to measure. If the result is negative in S6, the process returns to the position before S6 and the process is continued.

  Furthermore, in S10, the search unit 21a determines whether or not the current position P when the vehicle further travels on the route has reached the end Px + 1 of the measurement section Zx, and P matches Px + 1. In this case, the coincidence time Tx + 1 is stored, and in step S8 or S9, the measurement unit 21d finishes actually measuring the information on the exhaust gas on the vehicle, the process proceeds to step S11, and the calculation unit 21e of the car navigation ECU 21 is completed. Calculates the exhaust gas emission amount Vx in the measurement section Zx using these information, the engine displacement per unit time and the travel time of the measurement section Zx obtained by subtracting the time Tx from the time Tx + 1, and proceeds to S12. .

  In S12, the transmission unit 21f of the car navigation ECU 21 determines whether or not the discharge amount Vx calculated by the calculation unit 21e in S11 is equal to or greater than a predetermined discharge amount threshold value Vth. If the determination is affirmative, the process proceeds to S13. 4 transmits data including the emission amount Vx to the server 31 of the center 3 via the CAN, the communication device 14, the base station 4, and the network. Upon receiving the data including the emission amount Vx transmitted from the vehicle, the server 31 collects and stores the data including the emission amount Vx from the communication device 77 and assigns it to each link corresponding to the measurement section Zx. .

  Furthermore, in S14, the setting unit 21c of the car navigation ECU 21 determines whether or not x = n. If the determination is negative, the process proceeds to S15, where x = x + 1 is incremented, and S4 to S13. The above-described processing is performed, and the processing from S15 and S4 to S13 is repeated until the determination whether x = n is affirmative in S14. Accordingly, a setting step is executed in which the measurement section Zx is sequentially set with respect to all the intersections P1 to Pn on the route, with the intersection Px as the starting end and the adjacent intersection Px + 1 as the end.

  Further, in each section, a measurement step for actually measuring information on the exhaust gas on the vehicle is executed in S8 or S9. In S11, measurement is performed based on the information on the exhaust gas and the time during which the vehicle travels in the measurement section Zx. A calculation step for calculating the exhaust amount Vx of the vehicle exhaust gas in the zone Zx is executed. In S13, a collection step for collecting the exhaust gas emission amount Vx of the vehicle in the measurement section Zx and an assignment step for assigning each link are executed.

  According to the road-to-vehicle communication system 1 of the present embodiment realized by these control contents, the following operational effects can be obtained. That is, based on the information about the exhaust gas actually and continuously measured on each vehicle in the measurement zone Zx and the time during which the vehicle travels in the measurement zone Zx, the calculation unit 21e performs exhaust gas of the vehicle in the measurement zone Zx. The amount of discharge Vx can be calculated more accurately.

  Thereby, the server 31 of the center 3 has desired data including the exhaust gas emission amount Vx of each vehicle from different vehicles for each measurement section Zx set by the setting unit 21c (that is, information on necessary events). Can be collected from the calculation unit 21e of each vehicle via the transmission unit 21f and the communication device 77 constituting the reception means.

  Further, in the server 31 that is an assigning means, the collected data is allocated to each link on the road network and is divided for each measurement section Zx, and then summed for each measurement section Zx for each fixed period, and the measurement section The exhaust gas emission amount ΣVx for each Zx can be accurately calculated.

  In this way, the server 31 calculates and formulates the emission reference amount for each measurement section Zx by multiplying the coefficient determined appropriately based on the exhaust gas emission amount ΣVx for each measurement section Zx that is accurately obtained. The target emission reduction amount can be determined based on the emission reference amount. In addition, the coefficient used for the formulation of the emission reference amount is determined specifically for each measurement section Zx.

  Further, in obtaining the emission amount ΣVx for each measurement section Zx, the exhaust gas emission amount Vx of a different vehicle for each measurement section Zx has already been obtained in advance by the calculation unit 21e of each vehicle 2 and is a collecting means. In the server 31, it is only necessary to divide these emission amounts Vx for each measurement section Zx and simply add them, so as in the prior art, the beginning of the measurement section of the emission amount measured in each vehicle 2. It can be avoided that the terminal ends differ for each vehicle 2. Thereby, it is possible to prevent the processing of the road-to-vehicle communication system 1 from becoming complicated when obtaining the emission amount ΣVx.

  Further, by providing the roadside server 31 with a collecting means for collecting the exhaust gas emission amount Vx of the vehicle 2 in the measurement section Zx from the calculation unit 21e of the car navigation ECU 21, when there are a plurality of vehicles 2, On the basis of the information on the exhaust gas discharged from each vehicle 2 measured by the measurement unit 21d of the car navigation ECU 21 mounted in the vehicle 2, the exhaust gas emission amount Vx of each vehicle 2 calculated by the calculation unit 21e, The data can be collected after being assigned to each measurement section Zx.

  For this reason, the discharge amount ΣVx for each measurement section Zx can be obtained more accurately. Thereby, the emission amount ΣVx for each measurement section Zx is transmitted from the server 31 of the center 3 to the car navigation ECU 21 of each vehicle 2 and linked to the link included in the search map information of the database 9. When the search unit 21a searches for a route, it is possible to preferentially search a route with as little emission amount ΣVx as possible and display it on the display 10 to the driver. Thereby, the balance of the exhaust gas emission amount as a whole region can be made favorable, and the total amount of the emission amount as a whole region can be appropriately reduced. That is, the air pollution (environmental deterioration) in the area can be improved.

  At the same time, each vehicle 2 travels in the measurement zone Zx at a different time or date, and the server 31 collects the emission amount Vx calculated by the calculation unit 21e at each timing. By performing statistical processing that divides the obtained data for each vehicle transmission source ID and sums up every predetermined period, the emission amount ΣVx in the predetermined period in the measurement section Zx for each vehicle 2 can be accurately obtained.

  In this way, the emission amount ΣVx in a certain period in the measurement section Zx for each different vehicle 2 can be accurately obtained. Therefore, when different vehicles 2 belong to different operators, the emission amount between the operators. It is possible to easily buy and sell the right to discharge ΣVx, that is, the emission right.

  In addition, since the server 31 can determine the vehicle type based on the transmission source ID of the vehicle, the emission amount ΣVx for each measurement section Zx for each vehicle type can be obtained individually, and thus, for each measurement section Zx for each vehicle type. The emission amount ΣVx can be fed back and reflected in the vehicle design for each vehicle type.

  Further, in the road-to-vehicle communication system 1 of the above-described embodiment, at the time Tx + 1 when the vehicle 2 passes through the intersection Px + 1 located at the end of the measurement section Zx, the server 31 serving as the collection unit is operated by the calculation unit of the car navigation ECU The exhaust gas emission amount Vx of the vehicle 2 in the measurement zone Zx is collected from 21e, and according to this, the following advantageous effects can be obtained.

  That is, at every timing Tx + 1 when the measurement unit 21d of the car navigation ECU 21 finishes measuring the information related to the exhaust gas in the measurement section Zx, the server 31 collects the exhaust gas emission amount Vx of the vehicle 2 in the measurement section Zx from the calculation unit 21e. Therefore, when the road connecting the adjacent intersections Px and Px + 1 is set as the measurement section Zx, the intersections Px and Px + 1 are dense in the urban area, and accordingly, the collection between the car navigation ECU 21 and the server 31 is performed accordingly. Since the frequency of communication timing is increased and the density of intersections is low in the suburbs, the frequency of communication timing can be decreased accordingly.

  In addition, by including the calculation unit 21e in the car navigation ECU 21 that is an in-vehicle device, as shown in the process of S12 in the flowchart of FIG. 7, the exhaust gas discharge amount Vx is calculated for each different vehicle, and the discharge amount Vx Can be collected by the server 31 of the center 3 only when is equal to or greater than a predetermined threshold value Vth.

  Thereby, for example, when the measurement interval Zx is set to be extremely short, the exhaust gas emission amount Vx in the measurement interval Zx is extremely small, and when the collected data is not useful, the transmission unit 21f. The communication load and communication frequency between the car navigation ECU 21 which is an in-vehicle device and the server 31 of the center 3 can be reduced. At the same time, it is possible to prevent storing unusable data in the storage device 73 of the server 31, reduce the processing load on the server 31, and secure the storage capacity of the storage device 73.

  Further, when calculating the exhaust gas emission amount Vx in the measurement section Zx for each different vehicle 2, the detection result of the exhaust gas sensor 11 unique to each vehicle 2 and the exhaust amount per unit time of the engine or mainly control of the engine system. Since information and theoretical formulas are used, transmitting data including these pieces of information from the vehicle 2 to the server 31 causes an increase in the number of data frames constituting the data and increases a communication load.

  For this reason, as shown in the road-to-vehicle communication system 1 of the present embodiment, the calculation unit 21e is provided on the vehicle 2 side, and after the calculation unit 21e for each vehicle 2 calculates the discharge amount Vx, the transmission unit 21f performs the discharge amount. By transmitting data including Vx via the CAN, the communication device 14, the base station 4, and the network NW, the server 31 of the center 3 receives and collects data including the emission amount Vx by the communication device 77, The communication load can be reduced by reducing the number of fields of the data frame constituting the data to be communicated.

  In the road-to-vehicle communication system 1 shown in the first embodiment described above, when the vehicle 2 travels on a route assuming a certain destination Pg, with the home or business as the departure point, that is, the measurement start point Ps. Although the road connecting the first intersection P1 of the route and the starting point and the road connecting the last intersection Pn of the route and the destination are excluded from the measurement section Zx, these roads may be included. Hereinafter, an embodiment thereof will be described as a second example.

[Second Embodiment]
FIG. 8 is a flowchart showing the control contents of another embodiment of the road-vehicle communication system according to the present invention. FIG. 9 is a schematic diagram showing a specific example of the route and measurement section applied to the embodiment of the road-to-vehicle communication system according to the present invention, and accumulated emission amount data. In addition, about each component which comprises a road-vehicle communication system, since it is the same as that of what was shown in the 1st Example mentioned above, the same code | symbol is attached | subjected and the overlapping description is omitted.

  Again, when the current position P of the vehicle 2 reaches the nearest intersection Px on the route searched by the search unit 21a, the setting unit 21c of the car navigation ECU 21 is adjacent to the nearest intersection Px on the route. A road connecting the intersection Px + 1 is set as the measurement section Zx.

  In addition, in the present embodiment, the setting unit 21c of the car navigation ECU 21 sets the exit for the road adjacent to the departure place when the current position P of the vehicle 2 is the exit Ps of the road adjacent to the departure place. A road connecting the first intersection P1 on the route from Ps is set as the measurement section Z0, and if the current position P of the vehicle 2 is the last intersection Pn on the route, the last intersection Pn and the destination Pg are connected. The road is set to the measurement section Zn.

  For example, when the route is as shown in FIG. 9 (a), at the exit Ps to the starting road, the setting unit 21c first sets the exit Ps and the first as shown in FIG. 9 (b). When the road connecting the intersection P1 is set to the measurement section Z0 and the intersection P1 is reached, the setting unit 21c also connects the intersection P1 and the adjacent intersection B on the route as shown in FIG. 9B. Set to measurement zone Z1.

  Similarly, as shown in FIG. 9 (b), when the intersection P2 is reached, a road connecting the intersection P2 and the adjacent intersection P3 on the route is set as the measurement zone Z2, and as shown in FIG. 9 (b). When the intersection Pn-1 is reached, the road connecting the intersection Pn-1 and the adjacent intersection Pn on the route is set as the measurement zone Zn-1, and when the intersection Pn is reached, the road connecting the intersection Pn and the destination Pg is measured. Set to zone Zn.

  As a result, as shown in FIG. 9C, the road in which data including the discharge amount Vx (x = 0 to n) is stored in the storage device 73 in each of the measurement sections Zx of the start end Px end Px + 1. Allocated for each link of the network data and summed for each link to calculate ΣZx, or summed for each vehicle 2 to calculate ΣVx, stored in the storage device 73 and accumulated.

  Hereinafter, the control content of the road-to-vehicle communication system 1 of the above-described embodiment will be described using a flowchart. As shown in FIG. 8, after the driver inputs a search condition including the destination Pg on the display 10 at S21, the search unit 21a of the car navigation ECU 21 at S22 shows the vehicle when it first comes out on the road. Measure the position Ps, ie the exit of your home or office.

  Further, in S23, the search unit 21a of the car navigation ECU 21 determines the route from the vehicle position Ps to the destination Pg and n reference points Px (x = 0 to n: n are constants determined by the route, x = 0, the reference point P0 = vehicle position Ps when first exiting the road, and x = 1 to n means the reference point Px = intersection Px). Subsequently, in S24, the search unit 21a of the car navigation ECU 21 sets x = 0.

  Furthermore, in S25, the search unit 21a of the car navigation ECU 21 measures the current position P of the vehicle 2, and in S26, the setting unit 21c of the car navigation ECU 21 determines whether x = 0 and is positive. Advances to S27, and if negative, advances to S32.

  In S27, the setting unit 21c of the car navigation ECU 21 sets a road starting from the departure point Ps and ending at the first intersection P1 as the measurement zone Z0. Subsequently, in S28, the search unit 2a When the current position P when 2 further travels on the route reaches the start point Ps of the measurement section Z0, it is determined whether P matches Ps. If the result is affirmative, the matching time Ts is stored. In step S29, the measurement unit 21d of the car navigation ECU 21 actually measures information on the exhaust gas on the vehicle. If the result is negative in S28, the process returns to the position before S28 and the process is continued.

  Further, in S30, the search unit 21a determines whether or not the current position P when the vehicle 2 further travels on the route has reached the end P1 of the measurement section Z0, and P matches P1, If there is, the coincidence time T1 is stored, and in S29, the measurement unit 21d finishes actually measuring the information on the exhaust gas on the vehicle, the process proceeds to S31, and the calculation unit 21e of the car navigation ECU 21 Then, using these information and the travel time of the measurement section Z0 obtained by subtracting the time T0 from the time T1, the exhaust gas emission amount Vx (x = 0) in the measurement section Z0 is calculated, and the process proceeds to S43.

  In S43, the transmission unit 21f of the car navigation ECU 21 uses the data shown in FIG. 4 including the emission amount Vx (x = 0) calculated by the calculation unit 2e in S31 as the CAN, the communication device 14, the base station 4, and the network. The communication device 77 receives these data, and the server 31 collects the data including the emission amount transmitted from each vehicle 2 from the communication device 77 in this way. And accumulate.

  Further, in S44, the setting unit 21c of the car navigation ECU 21 determines whether or not x = n. If the determination is negative, the process proceeds to S45, where x = x + 1 is incremented, and S25 to S26. Since the above-described processing is performed and x = 1 in this case, the setting unit 2c determines negative in S26, and proceeds to S32 to determine whether 0 <x <n. Since there is, it progresses to S33.

  In S33, the setting unit 21c of the car navigation ECU 21 sets a road that starts at the intersection Px and ends at the adjacent intersection Px + 1 as the measurement section Zx. Subsequently, in S34, the search unit 21a determines whether the current position P when the vehicle 2 further travels on the route has reached the start point Px of the measurement section Zx, and P matches Px, and is positive. In this case, the matched time Tx is stored, and the process proceeds to S35, where the measurement unit 21d of the car navigation ECU 21 actually measures information on the exhaust gas on the vehicle. If the result is negative in S34, the process returns to the position before S34 and the process is continued.

  Further, in S36, the search unit 21a determines whether or not the current position P when the vehicle 2 further travels on the route has reached the end Px + 1 of the measurement section Zx, and P matches Px + 1. In this case, the coincident time Tx + 1 is stored, and in step S37, the measurement unit 21d finishes actually measuring the information on the exhaust gas on the vehicle, the process proceeds to step S37, and the calculation unit 21e of the car navigation ECU 21 Using this information and the travel time of the measurement section Zx obtained by subtracting the time Tx from the time Tx + 1, the exhaust gas emission amount Vx in the measurement section Zx is calculated, and the process proceeds to S43.

  In S43, the transmission unit 21f transmits data including the discharge amount Vx to the server 31, and proceeds to S44. In S44, the setting unit 21c determines whether x = n, and x = n−1. Until S4, the negative process of S44, the increment process of S45, the negative processes of S25 and S26, and the positive process of S32 are continuously performed, and the discharge amount Vx of the measurement section Zx is x = 1 to n− in S37. 1 is calculated by the calculation unit 21e, and in S43, data including the discharge amount Vx is transmitted from the transmission unit 21f to the server 31 each time.

  In S44, when x = n−1, the negative process of S44 and the increment process of S45 are performed, and then x = n, the negative process of S25 and S26, the negative process of S32, and the process of S38. Is executed.

  In S38, the setting unit 21c of the car navigation ECU 21 sets a road that starts at the intersection Pn and ends at the destination Pg as the measurement zone Zn. Subsequently, in S39, the search unit 21a determines whether or not the current position P when the vehicle 2 further travels on the route has reached the starting end Pn of the measurement section Zn and P matches Pn. In some cases, the coincident time Tn is stored, and the process proceeds to S40, where the measurement unit 21d of the car navigation ECU 21 actually measures information on the exhaust gas on the vehicle. If the result in S39 is negative, the process returns to the position before S39 and the process is continued.

  Further, in S41, the search unit 21a determines whether or not the current position P when the vehicle 2 further travels on the route has reached the end Pg of the measurement section Zn, and P matches Pg. If there is, the coincidence time Tg is stored, and in step S40, the measurement unit 21d finishes actually measuring the information on the exhaust gas on the vehicle, the process proceeds to step S42, and the calculation unit 21e of the car navigation ECU 21 Using these information and the travel time of the measurement zone Zn obtained by subtracting the time Tn from the time Tg, the exhaust gas emission amount Vx (x = n) in the measurement zone Zn is calculated, and the process proceeds to S43.

  In S43, the transmission unit 2f transmits data including the discharge amount Vx (x = n) to the server 31, and the process proceeds to S44. In S44, the setting unit 21c determines whether x = n. Since x = n, the control is terminated by a negative process in S44.

  According to the road-to-vehicle communication system 1 of the present embodiment realized by these control contents, in addition to being able to obtain the same functions and effects as those described in the first embodiment, the following functions are provided. An effect can be obtained. That is, the emission amount Vx (x = 0) on the road connecting the first intersection P1 on the route and the exit Ps of the departure point, and the emission amount V (on the road connecting the last intersection Pn and the destination Pg on the route ( x = n) can be determined.

  By performing such processing, particularly when the corresponding vehicle 2 is a plurality of vehicles 2 belonging to a large-scale business operator, the emission amount Vx (x = 1 to n−) on the road connecting adjacent intersections. In addition to the data of 1), the emission amount Vx (x = 0) on the road connecting the first intersection P1 on the route and the exit Ps of the departure point is connected to the last intersection Pn on the route and the destination Pg. The emission amount Vx (x = n) on the road can be regarded as useful data and can be collected and accumulated in the server 31 of the center 3. Along with this, the server 31 sums up these data for each vehicle at regular intervals, and calculates the emission amount ΣVx (x = 0) and the emission amount ΣVx (x = n) by statistical processing. The following advantageous effects can be obtained.

  That is, the emission amount ΣVx (x = 0) in the first measurement interval Z0 on the route and the emission amount ΣVx (x = n) in the last measurement interval Zn are calculated by the center 3. Accordingly, whether or not the accelerator work of the driver of the vehicle belonging to this business operator is not preferable from the viewpoint of reducing the exhaust gas emission amount is determined by calculating the emission amount ΣVx (x = 0) and the emission amount ΣVx (x = n). Obtaining at regular intervals, determining by comparing with a predetermined reference value, setting a reduction target amount as appropriate, and notifying this business operator to suppress the emission of local exhaust gas Can do.

  In the first and second embodiments, data including the calculated emission amount Vx is transmitted to the server 31 at every timing when the measurement unit 21d of the car navigation ECU 21 actually measures the information related to the exhaust gas on the vehicle. However, when the request to update the data in the server 31 to the data actually measured on the vehicle is low or the real-time property required for the data is low, as shown in S46 of FIG. After the car navigation ECU 21 stores the exhaust gas emission amount Vx for each Zx in the EEPROM or the database 9, the processing of S43 is positioned after S44, and the vehicle travels all at once after the vehicle travels the route. It is also good. Alternatively, as shown in S47 and S43 of FIG. 11, when IGOFF is detected, it may be transmitted all at once.

[Other Examples]
The best mode for carrying out the present invention has been described above with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the present invention. And substitutions can be added.

  For example, in the first and second embodiments described above, the GPS antenna 5 is used to measure the current position of the vehicle 2, but if the current position of the vehicle 2 can be measured, for example, a mobile phone terminal Etc. can also be applied. It is also possible to measure the current position of the vehicle 2 using road-to-vehicle communication.

  Further, in the first and second embodiments described above, the calculation means for calculating the emission amount based on the information related to the exhaust gas is provided in the car navigation ECU 21, but this may be provided in the server 31 of the center 3. Of course it is possible.

  In this case, the data transmitted by the transmission means 2f is data including information relating to exhaust gas instead of the emission amount Vx shown in FIG. 4, and after the communication device 14 constituting the reception means receives this data. This data is collected by the server 31 as the collecting means, and the server 31 as the assigning means is also assigned and stored in the storage device 73 for each link of the map information corresponding to the measurement section Zx.

  In the first and second embodiments described above, the case where the car navigation ECU 21 is used as the emission amount calculation ECU in the vehicle-mounted device has been described. However, for example, as shown in FIG. The setting unit 15c, the measurement unit 15d, the calculation unit 15e, and the transmission unit 15f are configured with the emission amount calculation ECU 15 of the vehicle as an in-vehicle device, and instead of the GPS antenna 5, the yaw rate sensor 6, and the steering sensor 7, a dedicated road-vehicle communication The machine 16 may be connected. It can also be used as an inter-vehicle communication device.

  Furthermore, in the first and second embodiments described above, as a transmission timing (transmission condition) for transmitting vehicle information, when the exhaust gas emission amount reaches a specified value (a preset threshold), Although the case where the vehicle arrives at the transmission point has been described, the present invention is not limited to this, and as a transmission condition, as long as the transmission condition is set to be limited to information related to the event required, In addition, various conditions can be appropriately set as transmission conditions.

  Further, according to the road-to-vehicle communication system 1 of the present invention, even when the vehicle has not reached the timing for transmitting the vehicle information, when a certain vehicle satisfies the above conditions and transmits the vehicle information. Vehicle information can also be collected from other vehicles located around the transmitted vehicle. As a result, according to the road-to-vehicle communication system 1, it is possible to collect more information related to the events required by the center 3 in the area where the vehicle information is transmitted, and thus the degree of air pollution (environment in the area). The degree of contamination) can be grasped.

  According to the road-to-vehicle communication system, the in-vehicle device, the center, the road-to-vehicle communication method and program of the present invention, unnecessary communication can be avoided and communication load can be remarkably reduced, and desired information can be accurately collected. It is possible to provide an in-vehicle device, a center, a road-to-vehicle communication method, and a program that can grasp an accurate environmental state, which is useful when applied to various vehicles such as passenger cars, trucks, and buses.

1 is a block diagram showing an embodiment of a road-vehicle communication system according to the present invention. It is a block diagram which shows a part of one Embodiment of the road-vehicle communication system which concerns on this invention. It is a schematic diagram which shows the path | route to which one Embodiment of the road-vehicle communication system which concerns on this invention is applied. It is a schematic diagram which shows the data with which one Embodiment of the road-vehicle communication system which concerns on this invention is applied. It is a block diagram which shows a part of one Embodiment of the road-vehicle communication system which concerns on this invention. It is a schematic diagram which shows the measurement area corresponding to the path | route with which one Embodiment of the road-vehicle communication system which concerns on this invention is applied, and the data accumulate | stored. It is a flowchart which shows the control content of one Embodiment of the road-vehicle communication system which concerns on this invention. It is a flowchart which shows the control content of one Embodiment of the road-vehicle communication system which concerns on this invention. It is a schematic diagram which shows the measurement area corresponding to the path | route with which one Embodiment of the road-vehicle communication system which concerns on this invention is applied, and the data accumulate | stored. It is a flowchart which shows the control content of one Embodiment of the road-vehicle communication system which concerns on this invention. It is a flowchart which shows the control content of one Embodiment of the road-vehicle communication system which concerns on this invention. 1 is a block diagram showing an embodiment of a road-vehicle communication system according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Road-to-vehicle communication system 2 ... Vehicle 21 ... Car navigation ECU
21c ... Setting means 21d ... Measurement means 21e ... Calculation means 21f ... Transmission means 3 ... Center 31 ... Server (collection means, allocation means)
DESCRIPTION OF SYMBOLS 4 ... Base station 5 ... GPS antenna 6 ... Yaw rate sensor 7 ... Steering sensor 8 ... Receiver 9 ... Database 10 ... Display 11 ... Exhaust gas sensor 12 ... Engine ECU
13 ... ABS
14 ... Communication device 15 ... Emission calculation ECU
71 ... CPU
72 ... Main storage device 73 ... Storage device 74 ... Display device 75 ... Input device 76 ... Drive device 77 ... Communication device (reception means)
78 ... Storage medium

Claims (14)

A road-vehicle communication system in which a vehicle and a center are communicably connected to each other, and the center receives and accumulates vehicle information transmitted from the vehicle,
Vehicle state detection means for detecting the state of the vehicle;
When the detection result detected by the vehicle state detection unit satisfies a predetermined condition set in advance, a transmission unit that transmits the detection result as the vehicle information;
Position detecting means for detecting the position of the vehicle;
Setting means for setting a section for detecting the state of the vehicle based on the position of the vehicle ;
The vehicle state detection means, the each of the sections set by the setting means, wherein the detects a state of the vehicle continuously, based on the state of the continuously detected vehicle, Ru obtains a detection result An in-vehicle device mounted on the vehicle;
Information transmission command means for prompting a vehicle existing around the vehicle that transmitted the vehicle information to transmit the vehicle information;
A road-vehicle communication system characterized by comprising: The road-to-vehicle communication system according to claim 1, wherein the information transmission command unit is provided on the center side. The transmission means transmits the detection result as the vehicle information when the vehicle reaches a predetermined point, even if the detection result by the vehicle state detection means does not satisfy the predetermined condition. The road-to-vehicle communication system according to claim 1 or 2. Before Symbol vehicle information includes position information based on the detection result of said position detecting means,
The transmission means transmits the vehicle information even when the position of the vehicle is different from the predetermined point when receiving an instruction to transmit the vehicle information from the center. The road-to-vehicle communication system according to claim 3. The road-vehicle communication system according to any one of claims 1 to 4, wherein the vehicle information includes information related to exhaust gas discharged from the vehicle. The road-to-vehicle communication system according to claim 5, wherein the exhaust gas includes any one of carbon dioxide, nitrogen oxides, and sulfur oxides. A vehicle-mounted device that is connected to a center so as to be communicable and is mounted on a vehicle to transmit vehicle information to the center,
Vehicle state detection means for detecting the state of the vehicle;
When the detection result detected by the vehicle state detection unit satisfies a predetermined condition set in advance, a transmission unit that transmits the detection result as the vehicle information ;
Position detecting means for detecting the position of the vehicle;
Setting means for setting a section for detecting the state of the vehicle based on the position of the vehicle ;
The vehicle state detection means continuously detects the vehicle state for each section set by the setting means, and obtains a detection result based on the continuously detected vehicle state,
The vehicle-mounted device, wherein the transmission unit transmits the vehicle information when receiving an information transmission command prompting the vehicle information to be transmitted from the outside. The transmission means transmits the detection result as the vehicle information when the vehicle reaches a predetermined point, even if the detection result by the vehicle state detection means does not satisfy the predetermined condition. The in-vehicle device according to claim 7. A center that is communicably connected to a vehicle and receives and accumulates vehicle information transmitted from the vehicle,
In the vehicle, the state of the vehicle is continuously detected for each section in which the state of the vehicle set based on the position of the vehicle is detected, and based on the continuously detected state of the vehicle. When the detection result of the state of the vehicle obtained in this way satisfies a predetermined condition set in advance, the detection result is transmitted as the vehicle information,
The center characterized by having an information transmission command means for urging other vehicles existing around the vehicle that has transmitted the vehicle information to transmit the vehicle information. The vehicle and the center are communicably connected to each other, the vehicle transmits vehicle information to the center, and the center receives and accumulates vehicle information transmitted from the vehicle.
A position detecting step for detecting the position of the vehicle;
A setting step for setting a section for detecting the state of the vehicle based on the position of the vehicle;
For each set interval by the setting step, and detects the state of the vehicle continuously, based on the state of the continuously detected vehicle, and the vehicle state detection step asking you to detection results,
When the detection result detected in the vehicle state detection step satisfies a predetermined condition set in advance, a transmission step of transmitting the detection result as the vehicle information;
An information transmission command step for prompting other vehicles existing around the vehicle that transmitted the vehicle information to transmit the vehicle information;
A road-vehicle communication method characterized by comprising: The road-to-vehicle communication method according to claim 10, wherein the information transmission command step is executed on the center side. In the transmission step,
The vehicle information is transmitted when the vehicle reaches a predetermined point even if the detection result detected in the vehicle state detection step does not satisfy the predetermined condition. Item 12. The road-to-vehicle communication method according to Item 10 or 11. A vehicle position detecting step for detecting the position of the vehicle;
The vehicle information includes position information based on a detection result in the vehicle position detection step.
In the transmission step, when receiving an instruction to transmit the vehicle information from the center, the vehicle information is transmitted even if the position of the vehicle is different from the predetermined point. The road-to-vehicle communication method according to claim 12. A program for causing a computer to execute the method according to any one of claims 10 to 13.

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