JP2006011814A - Probe-car-mounted unit and probe information collection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit collected probe information while protecting privacy against the identification of departure and destination points of a probe car. <P>SOLUTION: In a probe-car-mounted unit 10, a travel path measurement information storage part 13 stores a travel path of an associated vehicle acquired from a history of vehicle position information detected by a vehicle position determination part 12. A transmission path determination part 14 uses predetermined path extraction conditions to determine whether the travel path data stored in the travel path measurement information storage part 13 are transmittable, according to the vehicle position detected by the vehicle position determination part 12, states of vehicle operation, such as an engine start/stop and a vehicle start/stop, acquired by a vehicle operation state acquisition part 55, a state of vehicle destination setting by a car navigation system or the like acquired by a destination setting state acquisition part 56, and the like. A travel path transmission part 15 transmits transmittable travel path data to be transmitted to a probe information reception apparatus 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a probe car on-vehicle apparatus and a probe information collection system that collect probe information including information such as a travel locus of a vehicle.

  As a new method for collecting traffic information, a probe car system that collects information such as a traveling locus and a speed measured by the vehicle as a sensor (probe) at the center is currently being studied. Probe information collected at the center is used to generate traffic information and traffic control information. Unlike the ultrasonic sensors and AVI sensors that are fixed on the road, the probe car can collect data in real time from an extremely wide range without being limited to the information collection position. Highly accurate traffic information and traffic control information can be generated.

  In the probe car system, there is a possibility that the ID, position, travel locus, etc. of each vehicle to be a probe car may be specified, and privacy infringement needs to be considered. At present, in order to protect personal information, some studies have been made on the handling of ID information that can identify an individual. For example, in Patent Document 1, in order to avoid the problem of privacy infringement, in a navigation device, traffic information generated when the anonymous mode is designated is added to one communication path without adding its own identification ID. A device provided with a transmission means for continuous transmission by use is disclosed. Patent Document 2 discloses an area code indicating a position where the roadside control device is installed between the roadside control device and the vehicle in order to accurately calculate traffic quantities while protecting privacy. An information processing apparatus that transmits a data string including a spot dynamic code having an N-point code composed of a count value counted by a counter is disclosed.

  Also, as a probe car system that collects probe information using a beacon installed on the road, one using ID information for the purpose of collecting information on a departure place and an arrival place and information on a travel route is currently being studied. . In this system, the ID is determined with a random number when the engine of the probe car is started, and when the first beacon passes, an uplink flagged as “initial communication” is transmitted from the probe car onboard device to the beacon. On the center side, when the flag of “initial communication” is set in the received data, the downlink including the ID determined by the center is transmitted from the beacon to the probe car on-board device. In the communication after the next time, the probe car in-vehicle device transmits an uplink using the assigned ID. In this way, the ID assigned from the center is regarded as not personal information, and the probe information can be collected while ensuring privacy by using this ID to exchange data.

  However, since the probe car in-vehicle device transmits the travel locus information of the vehicle, even if the ID information is processed as described above, there is a possibility that personal information can be estimated from the travel locus information. For example, the home position can be estimated from the position where the engine is started or stopped, or the action such as the destination can be estimated based on the position where the engine is started or stopped, or the position where the probe car is stopped. In such a case, there is a risk of privacy infringement such that an individual who uses the probe car can easily be estimated, or an action that the other person does not want to be known is known.

JP 11-340895 A JP 2003-196784 A

  The present invention has been made in view of the above circumstances, and is a probe car capable of transmitting probe information collected while protecting privacy so that a starting point and a destination cannot be specified from the travel locus information of the probe car. An object is to provide an in-vehicle device and a probe information collecting system.

  A probe car on-board device of the present invention is a probe car on-vehicle device that collects probe information including information on a vehicle travel locus, a travel locus acquisition means for acquiring travel locus data traveled by the vehicle, and a predetermined locus. The travel locus data is determined using the extraction condition, and the travel locus data to be transmitted is extracted excluding the travel locus data of a predetermined period or section in which the user who uses the vehicle or the action can be specified. A traveling locus extraction means and a transmission means for transmitting the traveling locus data to be transmitted are provided.

  As a result, the starting point and the destination of the probe car cannot be specified by transmitting and transmitting the data except for the traveling locus data of a predetermined period or section in which the user can be identified individually or their actions. It is possible to transmit the collected probe information while protecting the privacy.

Further, as one aspect of the present invention, in the probe car on-vehicle device described above, the traveling locus extraction unit may identify traveling locus data that can specify any one or more of the departure point, the arrival point, and the waypoint of the vehicle. It is assumed that the travel locus data to be transmitted excluding is extracted.
As a result, the probe information collected while protecting privacy is transmitted by transmitting or excluding the travel locus data that can specify any of the departure point, arrival point, and waypoint of the vehicle, or a plurality of points. It becomes possible to do.

Further, as one aspect of the present invention, in the probe car on-vehicle apparatus described above, the trajectory extraction condition may be that the elapsed time from when the vehicle engine starts or when the vehicle stops for a predetermined time or less is less than a predetermined time, and the travel distance is It is assumed that a condition for excluding travel trajectory data for a period or a section after the engine is started or when the vehicle is stopped for a predetermined time or longer from which the traveling distance data is less than the predetermined distance or less than the predetermined distance from the transmission target.
Accordingly, it is possible to prevent the travel locus data of a predetermined period or section after the engine is started or after stopping for a predetermined time or more from being transmitted, and it is possible to transmit the travel locus data so that the departure place is not specified.

Further, as one aspect of the present invention, in the probe car on-vehicle apparatus described above, traveling locus data in an arbitrary area where the engine starting point of the vehicle or a point stopped for a predetermined time or more exists as the locus extraction condition. The conditions excluded from the transmission target shall be used.
Thereby, it is possible to prevent travel locus data in an arbitrary area including an engine start point or a point where the vehicle has stopped for a predetermined time or more from being transmitted, and it is possible to transmit the travel locus data so that the departure place is not specified.

Further, as one aspect of the present invention, in the probe car on-vehicle device described above, when a destination is set in the vehicle as the locus extraction condition, traveling in an arbitrary area where the destination exists It is assumed that a condition for excluding the trajectory data from the transmission target is used.
Thereby, it is possible to prevent the travel locus data in an arbitrary area including the destination from being transmitted, and it is possible to transmit the travel locus data so that the destination is not specified.

  Further, as one aspect of the present invention, in the probe car on-vehicle device described above, the area is determined based on an administrative boundary or a reference area mesh, or a predetermined arbitrary shape polygon.

Further, as one aspect of the present invention, in the above-described probe car on-vehicle device, a condition for excluding traveling locus data in a predetermined area set in advance as a transmission target is used as the locus extraction condition.
Moreover, as 1 aspect of this invention, it is said probe car vehicle-mounted apparatus, Comprising: The said area shall be set by the user of the said vehicle.
Thereby, it is possible to prevent the traveling locus data in a predetermined area set in advance from being transmitted, and it is possible to transmit the traveling locus data so that the starting point, the destination, the traveling route, etc. in this area are not specified. .

Further, as one aspect of the present invention, in the probe car on-vehicle device described above, the trajectory extraction condition is such that the elapsed time is less than a predetermined time and the travel distance is less than a predetermined distance retroactively from when the vehicle is stopped or when the engine is stopped. Alternatively, a condition for excluding travel locus data of a period or section before the stop or engine stop when the separation distance is less than the predetermined distance from the transmission target is used.
Thereby, it is possible to prevent the travel locus data of a predetermined period or section before the stop or the engine stop from being transmitted, and it is possible to transmit the travel locus data so that the destination is not specified.

Further, as one aspect of the present invention, in the probe car on-vehicle device described above, when the destination is set in the vehicle as the locus extraction condition, the reach distance to the destination, or the destination It is assumed that a condition for excluding traveling trajectory data of a period or section before reaching the destination, from which the separation distance is less than a predetermined distance, from the transmission target is used.
Thereby, it is possible to prevent the traveling locus data of a predetermined period or section before reaching the destination from being transmitted, and it is possible to transmit the traveling locus data so that the destination is not specified.

Further, as one aspect of the present invention, in the probe car on-vehicle device described above, the traveling locus extraction unit performs extraction of traveling locus data to be transmitted before data transmission, and is excluded by the locus extraction condition. It is assumed that the travel locus data for a predetermined period or section is not transmitted by the transmission means.
Thereby, it is possible to prevent the traveling locus data of a predetermined period or section in which the user individual or the behavior thereof can be specified from being transmitted.

Further, as one aspect of the present invention, the above-described probe car on-vehicle device includes travel locus storage means for accumulating the acquired travel locus data, wherein the travel locus extraction means is the travel locus data to be transmitted. Is extracted before the data is accumulated, and the traveling locus accumulation means does not accumulate traveling locus data for a predetermined period or section excluded by the locus extraction condition.
Thereby, it is possible to prevent accumulation and transmission of travel locus data for a predetermined period or section in which the individual user or his / her behavior can be specified.

Further, as one aspect of the present invention, the above-described probe car on-vehicle apparatus includes a trajectory extraction condition determining unit that variably determines a numerical value corresponding to a predetermined period or section in the trajectory extraction condition, The extracting means extracts the traveling locus data to be transmitted using the locus extraction condition based on the determined numerical value.
As a result, the numerical value corresponding to a predetermined period or section in the trajectory extraction condition becomes indefinite, and the period or section in which the individual user or its action can be specified changes. It becomes possible to make it more difficult.

A probe information collection system according to the present invention is a probe information collection system that collects probe information including information on a traveling locus of a vehicle, and is transmitted from the probe car on-vehicle device described above and the probe car on-vehicle device. A center device that obtains probe information including the travel locus data and generates traffic information of the road section based on the probe information.
As a result, the starting point and destination of the probe car cannot be specified by transmitting it excluding the traveling locus data of a predetermined period or section in which the user or his / her behavior can be specified, and privacy can be prevented. It is possible to transmit the collected probe information while protecting it.

The probe information collection method of the present invention is a probe information collection method in a probe information collection system that collects probe information including information on a travel locus of a vehicle, and a travel locus acquisition step for obtaining travel locus data traveled by the vehicle. The travel locus data is determined using a predetermined locus extraction condition, and the travel is a transmission target excluding the travel locus data for a predetermined period or section in which the user who uses the vehicle or the action of the user can be identified. The method includes a traveling locus extracting step for extracting locus data, and a transmission step for transmitting the traveling locus data for transmission.
As a result, the starting point and the destination of the probe car cannot be specified by transmitting and transmitting the data except for the traveling locus data of a predetermined period or section in which the user can be identified individually or their actions. It is possible to transmit the collected probe information while protecting the privacy.

  The present invention also provides a program for executing each procedure of the probe information collecting method.

  According to the present invention, there is provided a probe car on-board device and a probe information collection system capable of transmitting probe information collected while protecting privacy so that a starting point and a destination cannot be specified from travel locus information of the probe car. Can be provided.

(First embodiment)
FIG. 1 is a block diagram showing a functional configuration of the probe information collection system according to the first embodiment of the present invention. The probe information collection system acquires probe information from the probe car onboard device 10 mounted on the probe car, the probe information reception device 20 that receives the probe information transmitted from the probe car onboard device 10, and the probe information reception device 20. And a center device 30 that generates various types of traffic information.

  This probe information collection system uses a data collection vehicle deployed by a private information collection provider or a user vehicle with a traffic information providing service as a probe car, and the probe car in-vehicle device 10 is mounted on the probe car. Thus, probe information including information such as a traveling speed and a traveling locus regarding each point on the road on which the probe car has traveled is collected.

  The probe information receiving apparatus 20 is configured by a beacon installed on the road, a base station for mobile communication, or the like, and receives probe information transmitted from the probe car onboard device 10. The probe information receiving device 20 includes a data receiving unit 21 that receives probe information including a travel trajectory and a traveling speed of a probe car, and a center device communication unit 22 that transmits and receives data such as probe information between the center device 30. With.

  The center apparatus 30 is configured to include an information processing apparatus and the like, and acquires probe information from the probe information receiving apparatuses 20 arranged at various places, and generates and distributes traffic information. The center device 30 performs processing such as editing and analysis of probe information to generate traffic information such as average speed and travel time of the corresponding road section, and information distribution for distributing the generated traffic information. Part 32. The generated traffic information is distributed and used by the traffic information utilization device 40 such as a car navigation device, a mobile phone terminal, a portable information terminal, a personal computer or the like. In the traffic information utilization device 40, based on the provided traffic information, the degree of congestion of the target road section and the travel time are displayed, the route search to the destination, route guidance by voice, etc. are performed.

  The probe car on-vehicle device 10 includes a sensor information collection unit 11, a host vehicle position determination unit 12, a travel track measurement information storage unit 13, a transmission track determination unit 14, and a travel track transmission unit 15. The sensor information collection unit 11 collects measurement information of various sensors provided on the vehicle such as a speed sensor, a power output sensor, and a fuel consumption sensor. The vehicle position determination unit 12 receives a GPS signal from a speed detection unit 52 that detects the traveling speed of the vehicle from a speed pulse, a gyro 53 that detects a direction in which the vehicle is facing, and receives GPS position information. Based on the information sent from the GPS receiver 54 to be acquired, the current vehicle position is determined and detected as the vehicle position. The traveling locus measurement information storage unit 13 has functions of a traveling locus acquisition unit and a traveling locus storage unit, and acquires the traveling locus of the own vehicle from the history of the own vehicle position information detected by the own vehicle position determination unit 12. Then, the travel locus of the obtained own vehicle and the measurement information of various sensors collected by the sensor information collecting unit 11 are accumulated.

  The transmission trajectory determination unit 14 has a function of a travel trajectory extraction unit, such as the host vehicle position detected by the host vehicle position determination unit 12, the engine on / off acquired by the vehicle operation status acquisition unit 55, start and stop, etc. Based on the operation situation of the own vehicle, the setting situation of the destination of the own vehicle by the car navigation device acquired by the destination setting situation acquisition unit 56, etc., accumulated in the traveling locus measurement information accumulation unit 13 by a predetermined locus extraction condition It is determined whether or not the travel locus data can be transmitted. The traveling locus transmitting unit 15 has a function of a transmission unit, and transmits traveling locus data output by the transmission locus determining unit 14 that is determined to be able to be transmitted to the probe information receiving device 20. Note that when transmitting the travel locus data, encoding compression may be performed to reduce the data amount.

  Here, the transmission of the travel locus data includes information transmission by radio or wire, and also includes transmission via a recording medium. Therefore, the transmission means for transmitting the travel locus data includes not only a transmission device such as the travel locus transmission unit 15 but also a recording medium such as a memory card. Moreover, it is good also as a structure which not only accumulate | stores traveling locus data in the traveling locus measurement information storage part 13 as mentioned above but transmits traveling locus data in real time without accumulating.

  In the probe car on-vehicle device 10 having the above-described configuration, for example, in units of one second, the current position that is the basis of the travel locus data is detected in the own vehicle position determination unit 12, and the speed, power output, fuel, and the like are detected in the travel locus measurement information storage unit 13. Collect measurement data such as consumption. Then, the transmission trajectory determination unit 14 determines whether or not the travel trajectory data can be transmitted according to a predetermined trajectory extraction condition based on at least one of the own vehicle position, the operation situation of the own vehicle, and the setting situation of the destination. The travel locus data that may be determined or transmitted may be selected and output. This prevents the starting point or destination of the probe car from being estimated, prevents the identification of an individual who uses the probe car or the behavior thereof, and ensures privacy.

  As described above, based on the predetermined trajectory extraction condition, if the trajectory extraction condition is not met, transmission of travel trajectory data is prohibited, or only travel trajectory data that matches the trajectory extraction condition is selected and transmitted. Thus, not only the process of not transmitting the travel locus data depending on the locus extraction condition, but other processes may be performed. For example, when a predetermined locus extraction condition is not met, the traveling locus data is not stored, or the accumulated traveling locus data is discarded, so that the traveling locus data is not transmitted as a result. It may be.

  Here, the trajectory extraction condition for selecting the travel trajectory data that can be transmitted will be described. In the present embodiment, the traveling locus data is not transmitted to the center apparatus side in the following cases, and identification of the individual who uses the probe car or the action thereof is prevented.

  (1) For a while after the engine start of the probe car or after stopping for a predetermined time or longer, that is, for a predetermined time (for example, 5 minutes) from the time of engine starting or for a predetermined time or longer, for a predetermined distance (for example, 1 km), Alternatively, until the distance is more than a predetermined distance (for example, a distance of 1 km or more in a linear distance), the travel locus data is not transmitted or accumulated. Thereby, for example, the traveling locus until 5 minutes have passed since the engine start is not transmitted.

  (2) The timing from the accumulation of the travel locus data to the transmission is shifted by a predetermined time (for example, delayed by 5 minutes), and it goes back for a while before the probe car stops or before the engine stops, that is, from when the vehicle stops or when the engine stops. Thus, the travel locus data before a predetermined time (for example, 5 minutes), a predetermined distance of travel (for example, 1 km of travel), or a distance of a predetermined distance or more (for example, a linear distance of 1 km or more) is not transmitted. Thereby, for example, the travel locus for the last 5 minutes before the time when the engine is stopped is not transmitted.

  (3) When the destination is set by a car navigation device or the like, for a while before reaching the destination where the distance to the destination or the straight line distance to the destination is less than a predetermined value (for example, Do not transmit travel locus data (within 1 km to the destination). Thereby, for example, the travel locus from the destination to 1 km before is not transmitted.

  Next, an example of the travel locus data transmission operation in this embodiment will be described. FIG. 2 is a diagram illustrating a first operation example regarding a case where a beacon installed on the road is used as the probe information receiving device 20. Here, the case where the locus | trajectory which drive | worked the area from the home 61 to the destination 62 with the probe car 63 is shown. Beacon 64 functioning as probe information receiving device 20 is arranged at a plurality of points on the road, and probe information including travel locus data is received from probe car onboard device 10 of probe car 63 that passes in the vicinity of beacon 64. Uploaded.

  First, using the locus extraction condition (1), after starting the engine at the home 61 of the user of the probe car 63 or after stopping for a long time, the traveling locus is kept for a while (for example, until 1 km is run). Do not send or store data. For this reason, in the beacon A before the point where the predetermined period or section passes, the travel locus data from the home 61 to the vicinity of the beacon A is not transmitted, and the departure place is unknown. Then, after the probe car 63 has traveled and a predetermined period or section has passed, travel trajectory data can be transmitted, and travel trajectory data is transmitted and collected in beacons B and C, respectively. After that, when the probe car 63 arrives at the destination 62, since it does not reach the beacon D, the travel locus data from the vicinity of the beacon C to the destination 62 is not transmitted, and the destination becomes unknown.

  When a beacon is used as a probe information collecting means as in the first operation example, the beacon installation position is fixed at a predetermined position on a road such as a main road, so it communicates with the final beacon before the destination. After that, the travel locus is unknown and the destination cannot be specified, and only the departure place can be specified from the travel locus. For this reason, it is sufficient to apply only the trajectory extraction condition (1) to make the departure place unknown.

  It should be noted that the above-described trajectory extraction condition (2) is used so as not to transmit travel trajectory data for a predetermined period or section before the stop of the probe car 63 or the engine stop, or the above-described trajectory extraction condition (3). When the destination is set by a car navigation device or the like, the traveling locus data of a predetermined period or section before reaching the destination may not be transmitted. By doing so, it is possible to prevent the destination from being estimated when there is a beacon 64 immediately before and after the vicinity of the destination 62.

  FIG. 3 is a diagram illustrating a second operation example regarding the case where a mobile communication base station is used as the probe information receiving apparatus 20. In this case, the probe car in-vehicle device 10 of the probe car 63 that travels at a predetermined point, every predetermined traveling distance, every predetermined time, or the like using the base station 65 arranged for each predetermined communication area of mobile communication. Thus, probe information including travel locus data is uploaded to the base station 65.

  First, as in the first operation example, using the locus extraction condition (1), after starting the engine at the home 61 of the user of the probe car 63 or after stopping for a long time (for example, traveling 1 km). Do not transmit or accumulate travel locus data during For this reason, at the point A before the point where the predetermined period or section passes, the travel locus data from the home 61 to the vicinity of the point A is not transmitted, and the departure place is unknown. Then, after the probe car 63 has traveled and a predetermined period or section has passed, travel trajectory data can be transmitted, and travel trajectory data is transmitted and collected at points B and C, respectively. In the second operation example, the timing from the accumulation of the travel locus data to the transmission is delayed by a predetermined time, and the travel locus data up to a point slightly before the transmission point is transmitted.

  Thereafter, when the probe car 63 arrives at the destination 62, using the locus extraction condition (2), traveling locus data of a predetermined period or section before the stop of the probe car 63 or the engine stop is transmitted at the point D. Do not. As a result, transmission of travel locus data from a point C before the destination 62 for a while upstream to the destination 62 is avoided, and the destination becomes unknown.

  It should be noted that when the destination is set by the car navigation device or the like using the locus extraction condition (3), the traveling locus data for a predetermined period or section before reaching the destination may not be transmitted. Good. By doing in this way, it is possible to prevent the destination from being estimated when the travel locus data is transmitted immediately before the destination 62.

  Next, the operation at the time of traveling locus data transmission will be described. FIG. 4 is a flowchart showing a procedure of travel locus data transmission processing in the probe car on-vehicle device 10 of the first embodiment.

  The own vehicle position determination unit 12 detects the current own vehicle position based on the outputs of the speed detection unit 52, the gyro 53, and the GPS reception unit 54 (step S11). Then, the travel locus measurement information storage unit 13 measures the current position and the current time for every fixed distance, and accumulates the obtained travel locus data (step S12).

  Then, the transmission trajectory determination unit 14 determines whether or not it is a transmission timing, that is, whether or not communication with the probe information receiving device 20 occurs (step S13), and the travel trajectory data is accumulated in step S12 until the transmission timing is reached. Is done. When the transmission timing comes in step S13, the transmission trajectory determination unit 14 selects and extracts the transmission trajectory data to be transmitted that matches the trajectory extraction condition from the accumulated travel trajectory data (step S13). S14). Thereafter, the travel locus transmitting unit 15 converts the travel locus data determined to be transmittable into a transmission format (step S15), and transmits the travel locus data to the probe information receiving device 20 (step S16). Then, the above process is repeated.

  When the travel locus data accumulated in this way is transmitted, it is selected according to a predetermined locus extraction condition so that the travel locus data for a predetermined period or section in which the individual user of the probe car or its action can be specified is not transmitted. Thus, the collected probe information is transmitted while protecting the privacy.

(Second Embodiment)
FIG. 5 is a block diagram showing a functional configuration of a probe information collection system according to the second embodiment of the present invention. The second embodiment is a modification of the first embodiment, and is an example in which only traveling trajectory data that can be transmitted is determined by determining whether or not transmission is possible during data accumulation. The on-vehicle probe device 60 of the second embodiment includes a travel locus determination unit 14 between the own vehicle position determination unit 12 and the travel locus measurement information storage unit 13. Other components are the same as those of the first embodiment shown in FIG. 1, and the description thereof is omitted here.

  FIG. 6 is a flowchart showing a procedure of travel locus data transmission processing in the probe car on-vehicle device of the second embodiment. The own vehicle position determination unit 12 detects the current own vehicle position based on the outputs of the speed detection unit 52, the gyro 53, and the GPS reception unit 54 (step S21). Then, the traveling locus determination unit 14 determines whether or not the locus extraction condition is met (step S22). Here, when the locus extraction condition is met, the traveling locus measurement information storage unit 13 measures the current position and the current time for every predetermined distance, and accumulates the obtained traveling locus data (step S23). In this case, only travelable trajectory data that matches the trajectory extraction condition is accumulated.

  Then, the travel locus measurement information storage unit 13 determines whether or not it is a transmission timing, that is, whether or not communication with the probe information receiving device 20 occurs (step S24), and the travel locus data in step S23 until the transmission timing is reached. Is accumulated. When the transmission timing comes in step S24, the traveling locus transmission unit 15 converts the accumulated traveling locus data that can be transmitted into a transmission format (step S25), and transmits the traveling locus data to the probe information receiving device 20. (Step S26). Then, the above process is repeated.

  As described above, when the traveling locus data is accumulated, the traveling locus data is selected according to a predetermined locus extraction condition so that the traveling locus data of a predetermined period or section in which the individual user of the probe car or its action can be specified is not accumulated and transmitted. Thus, the collected probe information is transmitted while protecting the privacy.

(Third embodiment)
FIG. 7 is a block diagram showing a functional configuration of a probe information collection system according to the third embodiment of the present invention. The third embodiment is an example in which the parameter of the locus extraction condition is variable. The probe car in-vehicle device 70 of the third embodiment includes a trajectory extraction condition determination unit 71 having a function of trajectory extraction condition determination means for determining numerical values of parameters of the trajectory extraction condition. Other components are the same as those of the first embodiment shown in FIG. 1, and the description thereof is omitted here.

  As in the first embodiment, when the travel locus data for a predetermined period or section is not transmitted from the departure place according to the locus extraction condition, the specified value for this period (for example, 5 minutes) or section (for example, 1 km) is If the value is fixed and known in advance, the departure point may be estimated from several traveling tracks.

  FIG. 8 is a diagram for explaining an example in which the departure point can be estimated from a plurality of travel tracks. For example, when the travel locus data is transmitted as a travel locus to be transmitted from a position “linear distance 2 km from the engine starting point”, a radius of 2 km centering on the start position of each of the travel tracks 1 to 3 as shown in FIG. The starting point can be estimated from two or three traveling trajectories by drawing the circles C1 to C3. When the specified value of the travel locus to be transmitted is “travel distance 2 km from the engine start point”, the starting point is any one of the 2 km points from the start position of the transmitted travel locus, which is somewhat troublesome. Although calculation is necessary, it is possible to estimate the starting point from several traveling trajectories. Also, when the prescribed value of the travel locus to be transmitted is “5 minutes from the engine start time”, similar estimation is possible by converting the travel time of the traffic information into the travel distance.

  Therefore, in the third embodiment, in consideration of not transmitting a traveling locus around a starting point or a destination where an individual of the probe car who is the gist of the present invention or its action can be identified, By making the numerical value of the parameter of the predetermined trajectory extraction condition variable, it is made unstable and becomes indefinite. This makes it difficult to estimate the starting point or destination as described above.

  The trajectory extraction condition determination unit 71 of the probe car on-vehicle device 70 includes a random number generator and the like, and randomly sets the X, Y, and Z values of the parameters “travel distance Xkm”, “linear distance Ykm”, and “Z minutes” in the trajectory extraction condition. And the locus extraction condition is determined. Further, at the time of departure, any one of “travel distance Xkm”, “straight line distance Ykm”, and “Z minutes” may be selected at random. The information about the locus extraction condition is not notified to the center device side.

  FIG. 9 is a flowchart showing a procedure of travel locus data transmission processing in the probe car on-vehicle device 70 of the third embodiment.

  The own vehicle position determination unit 12 detects the current own vehicle position based on the outputs of the speed detection unit 52, the gyro 53, and the GPS reception unit 54 (step S31). Then, the travel locus measurement information storage unit 13 measures the current position and the current time for every fixed distance, and stores the obtained travel locus data (step S32).

  Then, the transmission locus determination unit 14 determines whether or not it is a transmission timing, that is, whether or not communication with the probe information receiving device 20 occurs (step S33), and the traveling locus data is accumulated in step S32 until the transmission timing is reached. Is done. When the transmission timing comes in step S33, the trajectory extraction condition determination unit 71 generates a random number or the like, randomly determines the numerical value of the parameter of the trajectory extraction condition, and sets the trajectory extraction condition each time (step S34). . Here, the travel distance or separation distance from the engine start position, the engine stop position, or the stop position, or how many travel traces the elapsed time is transmitted, or the parameter is changed each time to determine the trace extraction condition.

  Subsequently, the transmission trajectory determination unit 14 selects and extracts the transmission trajectory data to be transmitted that matches the trajectory extraction condition set above from the accumulated travel trajectory data (step S35). Thereafter, the traveling locus transmitting unit 15 converts the traveling locus data determined to be transmittable into a transmission format (step S36), and transmits the traveling locus data to the probe information receiving device 20 (step S37). Then, the above process is repeated.

  When transmitting the traveling locus data accumulated in this way, the locus extraction conditions are randomly determined each time, thereby making it difficult to estimate the departure place and the destination. Then, by selecting the travel track data according to the set track extraction conditions, the travel track data for a predetermined period or section in which the individual user of the probe car or its action can be specified is not transmitted, thereby protecting privacy. Transmit probe information collected while protecting.

(Fourth embodiment)
FIG. 10 is a block diagram showing a functional configuration of a probe information collection system according to the fourth embodiment of the present invention. The fourth embodiment is a modification of the third embodiment, and is an example in which only the traveling trajectory data that can be transmitted is determined by determining whether or not transmission is possible at the time of data accumulation. The probe in-vehicle device 80 of the fourth embodiment includes a travel locus determination unit 14 between the own vehicle position determination unit 12 and the travel locus measurement information storage unit 13. Other components are the same as those of the third embodiment shown in FIG. 7, and the description thereof is omitted here.

  FIG. 11 is a flowchart showing a procedure of travel locus data transmission processing in the probe car on-vehicle apparatus of the fourth embodiment. The trajectory extraction condition determination unit 71 generates a random number or the like to randomly determine the numerical value of the parameter of the trajectory extraction condition, and sets the trajectory extraction condition each time (step S41). The own vehicle position determination unit 12 detects the current own vehicle position based on the outputs of the speed detection unit 52, the gyro 53, and the GPS reception unit 54 (step S42). Then, the travel locus determination unit 14 determines whether or not the set locus extraction condition is met (step S43). Here, when the locus extraction condition is met, the traveling locus measurement information storage unit 13 measures the current position and the current time for every predetermined distance, and accumulates the obtained traveling locus data (step S44). In this case, only travelable trajectory data that matches the trajectory extraction condition is accumulated.

  Then, the traveling locus measurement information storage unit 13 determines whether or not it is a transmission timing, that is, whether or not communication with the probe information receiving device 20 occurs (step S45), and the traveling locus data in step S44 until the transmission timing is reached. Is accumulated. When the transmission timing comes in step S45, the traveling locus transmission unit 15 converts the accumulated traveling locus data that can be transmitted into a transmission format (step S46), and transmits the traveling locus data to the probe information receiving device 20. (Step S47). Then, the above process is repeated.

  As described above, when the traveling locus data is accumulated, the locus extraction conditions are randomly determined each time, thereby making it difficult to estimate the starting point and the destination. Then, by selecting the traveling locus data according to the set locus extraction condition, the traveling locus data for a predetermined period or section in which the individual user of the probe car or its action can be specified is not accumulated and transmitted. Transmit collected probe information while protecting privacy.

(Fifth embodiment)
In the fifth embodiment, as another example of the trajectory extraction condition, a case where the travel trajectory data to be transmitted is selected by area instead of a predetermined section or period in the travel trajectory is shown. The configuration of the probe car in-vehicle device is the same as that of the first embodiment shown in FIG. 1 or the second embodiment shown in FIG.

  In the fifth embodiment, generation, accumulation, transmission, and the like are performed by excluding travel locus data in an arbitrary area where a probe car engine starting point or a point where the vehicle has stopped for a predetermined time or more exists. In this case, generation, accumulation, transmission, and the like of travel locus data are performed from the outside of a preset area.

  In addition, when the destination of the probe car is set by a car navigation device or the like, generation, accumulation, transmission, etc. are performed by excluding traveling locus data in an arbitrary area including the destination. Is also possible.

  The above-mentioned optional areas are the administrative boundaries such as municipalities, rectangles such as standard area meshes (primary, secondary and tertiary meshes: Administrative Administration Agency Notification No. 143), and the number of households and population on the probe car side. It can be set using a polygon area of an arbitrary shape created originally. Moreover, you may make it make it a transmission object, if Nm away from these areas.

  Therefore, in the fifth embodiment, the following conditions are used as the locus extraction conditions for selecting the travel locus data that can be transmitted.

  (4) In any area where there is a probe car engine starting point or a point where the vehicle has stopped for a predetermined time or longer, travel locus data in this area is not transmitted. Thereby, for example, the area inside the administrative district such as the municipality where the engine is started, that is, the travel locus from the engine starting point to the administrative community is not transmitted.

  (5) When a destination is set by a car navigation device or the like, traveling locus data in an arbitrary area where the destination exists is not transmitted. As a result, for example, an area inside an administrative area such as a municipality where the destination is located, that is, a travel locus from the destination back to the administrative world is not transmitted.

  FIG. 12 is a diagram showing an example of travel locus data to be transmitted in the fifth embodiment of the present invention. In this example, an arbitrary area is set based on an administrative boundary B1 such as a municipality. As shown in the trajectories 1 to 3 shown in FIG. 12, the travel trajectory data inside the administrative border B1 is excluded, and only the travel trajectory data outside the points P1 to P3 intersecting the administrative border B1 is generated, stored, transmitted, and the like. The

  The procedure of the travel locus data transmission process in the fifth embodiment is the same as that in the first embodiment shown in FIG. 4 or the second embodiment shown in FIG. That is, in step S14 in FIG. 4 or step S22 in FIG. 6, it is possible to transmit that matches the trajectory extraction condition by determining whether or not the vehicle has gone out of the area using the trajectory extraction condition (4) or (5). Select travel locus data to be transmitted.

  In this way, by excluding travel locus data in an arbitrary area including the departure point and destination, it is possible to prevent the identification of the departure point and destination and transmit the collected probe information while protecting privacy. .

  Next, a modification of the fifth embodiment will be shown. In this modified example, the user of the probe car arbitrarily sets an area to be excluded so as not to generate, accumulate, and transmit travel locus data. In this case, an area in which the user does not want to know the behavior, travel route, etc. in the vicinity by operating input to the probe car on-board device is set in advance as a predetermined area. Do not generate, store, transmit, etc.

  As a result, as in the fifth embodiment shown in FIG. 12, the travel locus data in the set area is not transmitted, and the start point, destination, stop point, travel route, etc. in the area can be specified. become unable.

  The above arbitrary areas include administrative boundaries such as municipalities, rectangles such as reference area meshes (primary, secondary, and tertiary meshes), arbitrary rectangles, polygons of arbitrary shapes, and circles with a radius of Nkm centering on arbitrary points. Alternatively, the user can specify and set Nkm square.

  In this way, by excluding travel locus data in a predetermined area preset by the user of the probe car, it is possible to prevent the start point, destination, stop point, travel route, etc. in the set area from being specified. Transmit probe information collected while protecting privacy.

  As described above, according to the present embodiment, the start point, the destination, and the stop point are determined from the travel locus by not transmitting the travel locus data in the vicinity of the departure point or destination of the probe car or in a preset area. It is possible to make it difficult to estimate the travel route. Therefore, it is possible to estimate the home position of the probe car user, the destination performed by the probe car, and the like, and to prevent the individual probe car user or the behavior thereof from being specified. As a result, in the probe car system, it is possible to transmit the probe information collected while protecting the privacy, generate traffic information, and utilize this traffic information.

  The present invention has an effect of enabling transmission of probe information collected while protecting privacy so that a starting point and a destination cannot be specified from the traveling locus information of the probe car, such as a traveling locus of a vehicle. This is useful for a probe car in-vehicle device that collects probe information including information, a probe information collection system, and the like.

The block diagram which shows the function structure of the probe information collection system which concerns on the 1st Embodiment of this invention The figure which shows the 1st operation example regarding the case where the beacon installed on the road is used as a probe information receiving device as an example of transmission operation | movement of the driving locus data in this embodiment. The figure which shows the 2nd operation example regarding the case where the base station of a mobile communication is used as a probe information receiver as an example of the transmission operation | movement of travel locus data in this embodiment. The flowchart which shows the procedure of the travel locus data transmission process in the probe car vehicle equipment of 1st Embodiment. The block diagram which shows the function structure of the probe information collection system which concerns on the 2nd Embodiment of this invention. The flowchart which shows the procedure of the driving | running | working locus data transmission process in the probe car vehicle equipment of 2nd Embodiment. The block diagram which shows the function structure of the probe information collection system which concerns on the 3rd Embodiment of this invention. The figure explaining the example which can estimate a departure place from a plurality of run locus The flowchart which shows the procedure of the driving | running | working locus data transmission process in the probe car vehicle equipment of 3rd Embodiment. The block diagram which shows the function structure of the probe information collection system which concerns on the 4th Embodiment of this invention. The flowchart which shows the procedure of the driving | running | working locus data transmission process in the probe car vehicle equipment of 4th Embodiment. The figure which shows the example of the driving locus data of the transmission target in the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 60, 70, 80 Probe car vehicle equipment 11 Sensor information collection part 12 Own vehicle position determination part 13 Running locus measurement information storage part 14 Transmission locus judgment part 15 Running locus transmission part 20 Probe information receiving device 21 Data receiving part 22 Center Device communication unit 30 Center device 31 Traffic information generation unit 32 Information distribution unit 40 Traffic information utilization device 55 Vehicle operation situation acquisition unit 56 Destination setting situation acquisition unit 71 Trajectory extraction condition determination unit

Claims (16)

A probe car in-vehicle device that collects probe information including information on the travel locus of a vehicle,
Traveling locus acquisition means for acquiring traveling locus data traveled by the vehicle;
The traveling locus data to be transmitted excluding the traveling locus data of a predetermined period or section in which the traveling locus data is determined by using a predetermined locus extraction condition and the user who uses the vehicle or the action of the user can be identified. Traveling locus extraction means for extracting
Transmission means for transmitting the travel locus data to be transmitted;
A probe car on-board machine comprising: The probe car in-vehicle device according to claim 1,
The travel locus extraction means is a probe car on-vehicle device that extracts the travel locus data to be transmitted excluding the travel locus data that can specify any of the departure point, the arrival point, and the transit point of the vehicle, or a plurality thereof. The probe car in-vehicle device according to claim 1,
The trajectory extraction condition is as follows: when the engine is started or when the elapsed time from when the vehicle starts or when the vehicle stops for a predetermined time or longer is less than a predetermined time, the travel distance is less than a predetermined distance, or the separation distance is less than a predetermined distance. A probe car on-vehicle device that uses a condition for excluding traveling trajectory data of a period or section after a stop for more than an hour from a transmission target. The probe car in-vehicle device according to claim 1,
A probe car on-vehicle device that uses, as the locus extraction condition, a condition for excluding traveling locus data in an arbitrary area where an engine starting point of the vehicle or a point where the vehicle has stopped for a predetermined time or more exists from a transmission target. The probe car on-vehicle device according to claim 1 or 4,
A probe car on-vehicle apparatus that uses a condition for excluding travel locus data in an arbitrary area where the destination exists from a transmission target when the destination is set in the vehicle as the locus extraction condition. The probe car on-vehicle device according to claim 4 or 5,
The area is a probe car on-vehicle device that is determined based on an administrative boundary or a reference area mesh, or a predetermined arbitrary shape polygon. The probe car in-vehicle device according to claim 1,
A probe car on-vehicle device using a condition for excluding traveling locus data in a predetermined area set as a target for transmission as the locus extraction condition. The probe car in-vehicle device according to claim 7,
The area is a probe car on-vehicle device set by a user of the vehicle. The probe car on-vehicle device according to claim 1 or 3,
As the trajectory extraction condition, the elapsed time is less than a predetermined time, the travel distance is less than the predetermined distance, or the separation distance is less than the predetermined distance retroactively from when the vehicle is stopped or the engine is stopped. A probe car on-vehicle device using a condition for excluding traveling locus data of a period or a section from a transmission target. The probe car on-vehicle device according to claim 1 or 3,
When the destination is set in the vehicle as the trajectory extraction condition, the period before reaching the destination where the distance to the destination or the separation distance to the destination is less than a predetermined distance Or the probe car vehicle-mounted apparatus using the conditions which exclude the driving | running | working locus data of a section from transmission object. The probe car on-vehicle device according to any one of claims 1 to 10,
The travel locus extraction means extracts the travel locus data to be transmitted before data transmission, and does not transmit the travel locus data of a predetermined period or section excluded by the locus extraction condition by the transmission means. Probe car on-board machine. The probe car on-vehicle device according to any one of claims 1 to 10,
A traveling locus accumulating means for accumulating the obtained traveling locus data;
The travel locus extraction means extracts the travel locus data to be transmitted before data accumulation, and does not accumulate travel locus data for a predetermined period or section excluded by the locus extraction condition by the travel locus accumulation means. Probe car onboard machine to make. The probe car on-vehicle device according to any one of claims 1 to 12,
A trajectory extraction condition determining means for variably determining a numerical value corresponding to a predetermined period or section in the trajectory extraction condition;
The traveling locus extraction unit is a probe car on-vehicle apparatus that extracts traveling locus data to be transmitted using the locus extraction condition based on the determined numerical value. A probe information collection system that collects probe information including information on a running locus of a vehicle,
The probe car on-vehicle device according to any one of claims 1 to 13,
A center device that obtains probe information including travel locus data transmitted from the probe car onboard device, and generates traffic information of a corresponding road section based on the probe information;
A probe information collecting system comprising: A probe information collection method in a probe information collection system for collecting probe information including information on a travel locus of a vehicle,
A travel locus obtaining step for obtaining travel locus data on which the vehicle has traveled;
The traveling locus data to be transmitted excluding the traveling locus data of a predetermined period or section in which the traveling locus data is determined by using a predetermined locus extraction condition and the user who uses the vehicle or the action of the user can be identified. A running locus extracting step for extracting
A transmission step of transmitting the traveling locus data of the transmission;
A probe information collecting method.   The program for making a computer perform each procedure of the probe information collection method of Claim 15.

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