JP2018205971A - Road surface information collection system - Google Patents

Abstract

To provide a road surface information collection system capable of corresponding to a rapid change of a road surface state.SOLUTION: A road surface information collection system includes: multiple vehicles for collecting basic data of road surface unevenness information; and a data center for analyzing basic data acquired from the vehicles via radio communication so as to constitute road surface unevenness information and distributing the information via radio communication. The system can perform a rapid change correspondence function in such manners that: basic data including vibration data and position information is transmitted to the data center when the vibration data being equal to or more than a predetermined threshold is detected by the vehicle in a place where existing road surface unevenness information does not exist; the data center that has received the basic data performs a transmission request of the basic data to subsequent vehicles passing through the position; the threshold is substantially canceled in the subsequent vehicles that have received the transmission request; and the basic data is transmitted from all the subsequent vehicles passing through the position to the data center.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a road surface information collection system using a vehicle equipped with a communication terminal.

  Patent Document 1 discloses that vibration data associated with traveling of a vehicle is collected to estimate a road surface condition and reflected on a screen display or the like of a navigation device. By notifying the driver of road surface irregularities in advance and urging them to prepare, the safety of traveling and the maintenance of loaded cargo are intended.

JP 2010-287044 A

  By the way, basic information such as pavement and unpaved can be provided by a map information-based navigation system, but the inflow of earth and sand to the road surface due to sudden heavy rain, the damage of the pavement, the fall of loaded cargo to the road surface, etc. When the road surface condition changes suddenly or when the sudden change in road surface condition is resolved, information is distributed after the road manager confirms the site, so there is a limit to the responsiveness.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a road surface information collection system that can cope with a sudden change in road surface conditions.

In order to solve the above problems, the present invention provides:
A plurality of vehicles that collect basic data of road surface unevenness information, and a data center that analyzes the basic data acquired from the vehicle via wireless communication to form road surface unevenness information and distributes via wireless communication A road surface information collection system,
In a place where the existing road surface unevenness information does not exist, when vibration data exceeding a predetermined threshold is detected in the vehicle, basic data including the vibration data and position information is transmitted to the data center,
The data center that has received the basic data makes a request for transmission of basic data to the following vehicle that passes through the position, and the subsequent vehicle that has received the transmission request substantially cancels the threshold and passes all of the vehicles passing through the position. The basic data from the following vehicle is sent to the data center,
It is in the road surface information collection system that can execute the sudden change response function.

  The road surface information collecting system according to the present invention has the above-described configuration, in a place where there is no existing road surface unevenness information, when vibration data exceeding a predetermined threshold is detected in the vehicle, basic data including the vibration data and position information is detected. Is transmitted to the data center, so that newly appearing unknown road surface irregularities can be detected, and data unsuitable for analysis of road surface irregularities is excluded in advance, and the communication environment and the associated communication environment and It is advantageous for reducing the load on the system and improving the road surface unevenness analysis accuracy.

  In addition, the threshold value of the vibration data is canceled for the subsequent vehicle that has received the basic data transmission request, and the basic data is transmitted to the data center from all the subsequent vehicles that pass through the position regardless of the presence or absence of the vibration data. When vibration data is detected in the following vehicle, it is possible to reliably estimate the occurrence of road surface unevenness and to detect that no significant vibration data is detected, so the road surface unevenness at that position has been eliminated (falling objects, earth and sand) It was possible to estimate that the information was temporary, such as the inflow of information, and to prevent unnecessary information from being left unattended.

It is a block diagram which shows the road surface information collection system which concerns on this invention embodiment. It is the schematic which shows the road surface information collection system which concerns on this invention embodiment. It is a conceptual diagram which shows the averaging process and normalization process in the road surface information collection system which concerns on this invention embodiment. It is a conceptual diagram which shows the speed correction and the averaging process in the road surface information collection system which concerns on this invention embodiment. It is a figure which shows the example of the data table of the basic data collected by the vehicle, the road surface basic data collected by the data center, and the analyzed road surface information. It is a flowchart which shows the sudden change response function in the road surface information collection system of this invention embodiment. It is the schematic which shows the convex part passage pattern of a vehicle. It is a graph which shows the example of transition of the vibration detected by vehicles, vehicle speed, and a steering angle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2, the road surface information collection system 1 according to the present invention analyzes road surface information by analyzing at least one vehicle 10 that collects road surface basic data 21d and basic data 21d acquired via wireless communication. Data center 20 to obtain 24d.

(Vehicle side system configuration)
The system on the vehicle 10 side includes vehicle position detection means 11, vehicle information acquisition means 12, vibration detection means 13, vehicle grade information 14, basic data configuration means 15, transmission means 16, and the like.

  The vehicle position detection means 11 is a GPS receiver that acquires current position information (longitude, latitude, altitude) using a satellite positioning system, and is a navigation device as a one-chip GPS module that performs radio wave reception to position calculation. What is mounted in 18 can also be used.

  The vehicle information acquisition unit 12 includes a plurality of sensors that acquire parameters relating to the traveling state of the vehicle 10, including a vehicle speed sensor that acquires the vehicle speed and a steering angle sensor that detects the steering angle of the vehicle. These can also use existing sensors normally provided in the vehicle 10. These detected values are sent to the basic data constructing means 15 via the in-vehicle network (CAN).

  The vibration detecting means 13 can use a sensor that detects vertical vibrations when the vehicle travels reflecting the road surface condition. For example, as shown in FIG. 2, the left and right front wheels and the left and right rear wheel suspensions 2 and 3 It is composed of provided vertical acceleration sensors 13a and 13b, an acceleration sensor 13c for detecting vertical vibrations of the vehicle body, and the like. A pressure sensor that detects the tire air pressure of each wheel can also be used. The vibration data is sent to the basic data construction means 15 as described above. By providing a sensor for each of the front, rear, left and right wheels and suspension, it is possible to reliably detect that road surface unevenness exists only on one side of the road.

  The vehicle case information 14 is a parameter for eliminating the variation of the detection value of the vibration detection means 13 for each vehicle case, and is numerically stored in a ROM area of the basic data constituting means 15 described later. It is possible to use a statistic based on the vehicle body size or a numerical value based on a conventional vehicle grade or vehicle gross weight. In addition to these, numerical values may be used in consideration of the suspension type and tire standards (size, flatness).

  The basic data constructing means 15 is a vehicle-side control unit (ECU) of the road surface information collecting system 1, and the vibration data detected by the vibration detecting means 13 is acquired by the vehicle position detecting means 11 and the vehicle position at the time of vibration detection is acquired. A CPU that performs processing for configuring basic data associated with the vehicle speed acquired by the vehicle information acquisition means 12 and the vehicle type information 14, a ROM that stores programs for data collection and data configuration, threshold values, and the like; It is composed of a RAM that becomes a temporary storage area for the above processing.

  The transmission unit 16 is a radio communication terminal for performing radio communication with the base station 51 of the mobile communication network 50 and transmitting the basic data configured by the basic data configuration unit 15 to the data center 20. The transmission unit 16 may be configured as one communication apparatus (transmission / reception terminal) together with the reception unit 17 described below.

  The receiving means 17 receives the road surface information (24d) distributed from the data center 20, and displays the road surface information on the map display screen of the navigation device 18 as an overlay with characters, icons, and the like. Further, when an unknown road surface unevenness is detected in a preceding vehicle traveling on the planned traveling route of the vehicle and a basic data transmission request is received from the data center 20, a control signal for canceling the threshold value (lower limit value) of the vibration data Is output to the basic data construction means 15. This point will be described later.

  The navigation device 18 uses a satellite positioning system to obtain current position information (longitude, latitude, altitude) of the host vehicle, displays the position of the host vehicle together with map information, and provides route guidance to the destination. It is composed of a display screen (display), a processing device, and a speaker for voice guidance.

(Data center system configuration)
Next, the system on the data center 20 side includes a basic data receiving unit 21, a data processing unit 22, a data analysis unit 23, a road surface information database 24, a road surface information distribution unit 25, and the like.

  The basic data receiving unit 21 receives basic data (indicated by reference numeral 21d in FIG. 5) transmitted from the transmission means 16 of the vehicle 10 side system, temporarily stores it in the buffer area, and then, according to the position information, the road surface information database 24. Is stored in the road surface basic data table 22d. At this time, the basic data 21d (status “unprocessed”) includes statuses such as “normal”, “caution”, and “temporary setting requiring attention” according to the vehicle speed at the time of vibration detection and the deceleration and stop conditions before and after the vibration detection. Information is added. This point will be described later.

  When the basic data 21d is added to the road surface basic data 22d in accordance with the position information (for example, as shown in FIG. 5, the data processing unit 22 newly adds to the leftmost column of the table constituting the road surface basic data 22d. When basic data 21d of one vehicle is added), when the status is “normal”, averaging is performed by dividing vibration data (amplitude) by vehicle speed (speed index) with respect to basic data 21d. The normalization process which divides by a process and the numerical value (vehicle rank index) corresponding to the vehicle grade information 14 is implemented, and the road surface basic data table 22d is updated. When the status is other than “normal”, it is excluded from the processing target and the basic data 21d is put on hold. The speed index and vehicle grading index will be described later.

  The data analysis unit 23 analyzes the unevenness type and unevenness level of the road surface condition from the vibration data that has undergone the averaging process and the normalization process in the data processing unit 22, and updates the road surface information database 24 (data table 24d). The analysis of the unevenness type and the unevenness level will be described later.

  The road surface information database 24 includes a road surface basic data table 22d for each position on which road surface information is based, a road surface information data table 24d obtained by analyzing the road surface basic data table 22d, and a map information database (not shown). And is stored in the data server so as to be accessible from the data processing unit 22 and the data analysis unit 23.

  The road surface information distribution unit 25 receives the road surface information (24d) stored in the road surface information database 24 in response to a request from the vehicle side, or when the map information is updated, through the mobile communication network 50 or other vehicle 10 or other information. Delivered to the vehicle 30. In addition, when an unknown road surface unevenness (vibration data greater than or equal to a threshold value) is detected in a preceding vehicle traveling on the planned traveling route of the vehicle, a request for transmission of basic data is issued to the subsequent vehicle approaching the detection position. send.

(Determination of road surface condition based on vibration detection)
In the case of a non-paved road, irregular vibration is continuously detected by the vibration detecting means 13. On the other hand, even on paved roads, mountain roads with low traffic volumes are easily damaged and the frequency of repair work is low. On paved roads with high traveling speed, the sudden appearance of unevenness has a great influence on driving and vehicles.

  In such a single road surface unevenness, for example, when the vehicle 10 passes through a convex portion 6 formed on a relatively flat road as shown in FIG. 2A, the front wheel 2 first becomes the convex portion 6. The vibration peak 6a is detected in the detection waveform of the acceleration sensor 13a by riding up, and then the vibration peak 6b is detected in the detection waveform of the acceleration sensor 13b when the rear wheel 3 rides on the convex portion 6. In any of these waveforms, immediately after the wheel gets over the convex portion 6, the load is instantaneously reduced and the suspension (spring) is extended, so that a corrugated valley occurs.

  On the other hand, when the vehicle 10 ′ passes through the recess 7 formed on a relatively flat road as shown in FIG. 2 (b), the load decreases momentarily when the front wheel 2 enters the recess 7, After generating a trough in the waveform, when the front wheel 2 escapes from the recess 7, the vibration peak 7 a is detected in the detected waveform by hitting the edge of the recess 7. Similarly, when the rear wheel 3 passes through the recess 7. A peak 7b appears after a small valley.

  As described above, even if the difference in detection level occurs depending on whether or not the steering is avoided, the road surface condition can be estimated from a typical waveform pattern in the case of single or sporadic unevenness. Further, in the case of irregularities having the same shape and the same interval such as a speed breaker, periodic vibration waveforms are detected by the front and rear acceleration sensors 13a and 13b.

(Averaged and normalized vibration data)
If one vehicle 10 travels on all roads and collects vibration data, highly accurate road surface information can be obtained. However, since data collection takes a long time, the data update frequency is also reduced. On the other hand, by collecting vibration data of a large number of vehicles distributed in each region, a wide range of road surface information can be obtained in a relatively short period of time, and the data can be updated sequentially. It cannot be denied.

  Therefore, by performing averaging and normalization processing on the basic data as follows, the average vibration data is extracted by removing the requirements for each vehicle, and the estimation accuracy and update frequency of the road surface condition are extracted. Are trying to achieve both.

  For example, as shown in FIG. 3A, a plurality of vibration data classified as a small vehicle 10A, a plurality of vibration data classified as a medium vehicle 10B, and a plurality classified as a large vehicle 10C at the same point. When the vibration data is acquired, when the vibration data is divided by the vehicle speed (speed index) at the time of vibration detection, as shown in FIG. 6A, 6A ', 6A "..., 6B, 6B', 6B" ..., 6C, 6C ', 6C "... are obtained.

  Next, the vibration data 6A, 6A ', 6A "..., 6B, 6B', 6B" ..., 6C, 6C ', 6C "... are averaged for each vehicle type 10A, 10B, 10C. 3C, one vibration data 60A, 60B, and 60C is obtained for each of the vehicle grades 10A, 10B, and 10C, and the standard deviation is obtained for each vehicle case and ± 2 times the standard deviation. Vibration data deviating from the above are not considered.

  Next, by dividing the vibration data 60A, 60B, 60C for each of the vehicle grades 10A, 10B, 10C by the digitized vehicle case information (vehicle grade index), the vehicle is obtained from the vibration data 60A, 60B, 60C. The influence of the disparity is eliminated, and approximately equal vibration data is obtained. By averaging these, as shown in FIG. 3 (d), one vibration data normalized corresponding to the road surface condition at the point 60 is obtained.

  The vibration data 60 obtained in this manner is a general index reflecting the unevenness level because the influence of speed difference, individual difference, and vehicle difference on each vibration data is excluded. It is stored in the road surface information database 24 together with the estimated unevenness type (convex, concave, periodic continuous convex, irregularly continuous unevenness, etc.).

(Speed correction of vibration data considering the reference speed)
FIG. 4 shows an outline of the averaging process from speed correction in the same vehicle case (here, the small vehicle 10A) at the same point. In FIG. 3, the influence of the speed on the time axis is omitted for convenience, but in the actually detected vibration waveforms (6 a, 6 b, 7 a, 7 b in FIG. 2), 2 corresponding to the front wheel 2 and the rear wheel 3. The interval between the two peaks depends on the speed and the car grade (wheelbase). If the vehicle grade is the same, the scale of the vibration waveform in the time axis direction is inversely proportional to the speed.

  For example, in FIG. 4A, the vibration waveform 61 when the vehicle speed is relatively slow has a wider peak interval (longer time axis) than the vibration waveform 62 when the vehicle speed is intermediate. The amplitude of is small. On the other hand, the vibration waveform 63 when the vehicle speed is relatively fast has a narrow peak interval (short time axis) and a large peak amplitude compared to the vibration waveform 62 when the vehicle speed is intermediate.

  Therefore, the vehicle speed in each sample is divided by a reference speed (in this case, an intermediate vehicle speed for convenience) to obtain an index (speed index = speed / reference speed) with respect to the reference speed. By applying the exponent (dividing the amplitude and multiplying the time axis), as shown in FIG. 4B, vibration waveforms 61 ', 62', and 63 'whose time axis and amplitude are standardized by the reference speed are obtained. It is done.

  Since the vibration waveforms 61 ', 62', 63 'standardized by the reference speed as described above are free from the influence of the speed, the vibration as shown in FIG. Waveforms 61 ″, 62 ″, 63 ″ are obtained, and the vibration waveform 60A (= 62 ″) in FIG. 4D obtained by averaging with the vibration waveform 62 ″ at the reference speed is obtained.

  3 and 5, a plurality of basic data (vibration data A, 6A ′, 6A ″..., 6B, 6B ′, 6B ″,. .., 6C, 6C ', 6C "...) has been acquired, but even when only the first basic data is acquired, speed correction based on the reference speed, averaging processing, vehicle index The normalization process can be performed, and thereafter, when the basic data is added, those processes are performed, and the road surface information database 24 is updated.

  In FIG. 5, the basic data (data table 21d) collected by the basic data constituting unit 15 of the vehicle 10 and received by the basic data receiving unit 21 of the data center 20 is accumulated as a road surface basic data table 22d for each position. Based on this, a road surface information database 24d is constructed and updated.

(Response to sudden changes in road surface conditions)
By the way, unknown unevenness may appear in a place where unevenness information is not registered in the road surface information database 24 due to inflow of earth and sand on the road surface due to sudden heavy rain, pavement breakage, dropping of loaded cargo onto the road surface, etc. This is as already mentioned. Furthermore, there are cases where unknown irregularities are eliminated in a relatively short period of time by removing falling objects and earth and sand.

  In addition, in the road as shown in FIG. 7, when the convex part 6 appears on the road surface due to falling objects or inflow of earth and sand, discovery of the driver is delayed or there is an oncoming vehicle and it is impossible to change lanes or avoid steering In such a case, the vehicle 10 must go straight over the convex portion 6 as shown by an arrow 10a, but if there is no corresponding vehicle, steering is avoided as shown by an arrow 10b, or an arrow is shown. As shown by 10c, the lane can be changed and the convex part 6 can be avoided.

  For example, FIG. 8 is a graph showing an example of an amplitude (maximum amplitude of section vibration data), a steering angle, and a vehicle speed for each vehicle passing event in which one vehicle passes at a certain point as one event. Although the amplitude and the steering angle pass through a straight line while maintaining an appropriate vehicle speed at a predetermined threshold value or less, the vehicle 41 detects a significant vibration exceeding the threshold value f0 while passing through the straight line at a steering angle less than a predetermined value.

  However, although no vibration is detected in the vehicle 42, it is possible to estimate a situation in which steering is avoided while decelerating by detecting a significant steering angle and a decrease in speed. Therefore, just because no significant vibration data is detected, it cannot be determined immediately that the road surface unevenness has been eliminated. The vehicle 43 detects a significant vibration associated with the straight travel again, and subsequently detects the significant vibration associated with the straight travel on the vehicles 45 and 46 following the vehicle 44 estimated to avoid steering. The existence of is strongly estimated.

  On the other hand, even if it becomes a situation where the presence of an obstacle is estimated once, if there is a situation where the amplitude is below the threshold value f0 without any particular deceleration or steering as in the vehicles 47 to 49, then a fallen object or earth and sand It is estimated that obstacles such as were removed. However, in a system in which detection of significant vibration data is used as an event trigger for basic data transmission, basic data is not transmitted from these vehicles 47 to 49 or the above-described vehicles 42 and 44.

  In order to detect the absence of road surface irregularities, the absence of vibration data must be detected, and vibration detection cannot be used as an event trigger for basic data transmission. However, it is physically impossible to always receive basic data from all ordinary vehicles, regardless of a limited number of dedicated vehicles for collecting road surface information.

  Therefore, in order to quickly and accurately respond to unknown changes associated with the occurrence and resolution of the above-described failure, the road surface information collection system 1 according to the present invention has a sudden change response function as described below.

  FIG. 6 is a flowchart showing the processing procedure of the sudden change response function. First, when vibration data of a threshold value or more is detected in the first vehicle (vibration detecting means 13, basic data constituting means 15) in a place where there is no existing road surface unevenness information, the foundation including the vibration data and position information is detected. Data is transmitted to the data center 20 (step 100). At this point, it is unknown whether the basic data corresponds to known information or is unknown information. It is preferable that the vehicle index and the speed index described above are reflected in the threshold value.

  Next, in the data center 20 (basic data receiving unit 21) that has received the basic data, by querying the road surface information database 24, the position information of the basic data is unknown that is not stored in the road surface information database 24. If it is determined that the road surface unevenness information, the data center 20 (road surface information distribution unit 25) analyzes the road surface unevenness information based on the basic data, prepares a state where attention information about the position can be distributed, In response to a request from the following vehicle passing through the position, “caution information” is distributed to the following vehicle (step 101).

  This “attention information” also serves as a “basic data transmission request” for the following vehicle, and the following vehicle (reception means 17) that has received the “attention information” simultaneously displays the attention at the position on the navigation device 18. The basic data composing means 15 sends a “basic data transmission request” to the basic data composing means 15, and the basic data composing means 15 turns off (invalidates) the threshold value of vibration data, and obtains basic data without significant vibration data. The basic data including the vehicle speed and the steering angle is automatically transmitted to the data center 20 together with the vibration data when the subsequent vehicle passes through the position (step 102).

  When the following vehicle passes through the position and the basic data is transmitted to the data center 20, the data center 20 (basic data receiving unit 21) determines whether the basic data includes significant vibration data (vibration data). Whether or not the maximum amplitude is greater than the threshold) is determined (step 103). At this time, as described above, the vehicle case index and the speed index are reflected based on the vehicle case information and vehicle speed of the basic data.

  When significant vibration data is included in the basic data, the significant vibration data is detected continuously in the first vehicle and the following vehicle, so that the vibration data is caused by road surface unevenness. Then, the data center 20 further analyzes the road surface unevenness information in consideration of the basic data of the following vehicle, and “road surface unevenness information” is distributed from the road surface information distribution unit 25 to other subsequent vehicles (step 104). Step 105).

  In other succeeding vehicles that have received this “road surface unevenness information”, “road surface unevenness information” is displayed on the navigation device 18 (38) instead of (or in addition to) “caution information” (step 106), and the corresponding position When approaching, alerting is performed by voice guidance.

  On the other hand, when no significant vibration data is included in the basic data of the following vehicle, the steering angle data at the time of passing the position is referred to (step 111).

  For example, as shown in FIG. 7, when there is a convex portion 6 (such as a fallen object) on the road surface, significant vibration data is acquired if the vehicle 10 passes straight as indicated by the arrow 10a, but the arrow 10b If the steering is avoided as shown by or the lane change is avoided as shown by the arrow 10c, no significant vibration data is detected. However, in such a case, it is possible to determine whether or not steering is avoided (whether there is any obstacle) by referring to the steering angle data of the vehicle.

  If a steering angle of a predetermined value or more is detected in the basic data of the following vehicle, it is assumed that some kind of failure exists, and the count for canceling the caution information (the scheduled release count) is reset (c = 0). (Step 112), the distribution of “basic data transmission request” and “caution information” is continued, and the display of “caution information” is continued in the other succeeding vehicles (step 113).

  If no significant vibration data or a steering angle greater than the predetermined value is detected in the basic data of the following vehicle, either the road surface obstacle has already been resolved or the lane change has been avoided with a sufficient distance. Therefore, first, it counts as a release schedule (c = c + 1) (step 121).

  Thereafter, neither significant vibration data nor steering angle is detected for other succeeding vehicles, and it is determined whether or not the release count has reached the predetermined number n1 (step 122), and the release count is the predetermined number n1 (for example, 5 times). In the case of reaching “”, the distribution of “caution information” is stopped (step 123).

  Further, it is determined whether or not the release count has reached a predetermined number of times n2 (n2> n1) (step 124), and when it reaches the predetermined number of times n2 (for example, 20 times), the “basic data transmission request” is stopped. Then, the threshold value of vibration data in the following vehicle is turned on (valid) (step 125), and vibration data (basic data) at the normal driving level is not transmitted to the data center 20.

  On the other hand, if a steering angle greater than or equal to a predetermined value is detected in another succeeding vehicle before the release count reaches the predetermined number n2, it is assumed that a failure still remains, and the scheduled release count is reset (c = 0) (step 112), the distribution of the “basic data transmission request” and “caution information” and the “caution information” display of the following vehicle are continued (step 113).

  In the above-described embodiment, the case where the scheduled release count n1 for determining the suspension of the attention information is 5 times and the scheduled release count n2 for determining the stop of the basic data transmission request is 20 is shown, but the count number is n1, n2 can be set arbitrarily, and n1 and n2 may be the same count.

  When significant vibration data is newly detected at a point not registered in the road surface information database 24 by a sudden change function as described above, the vibration data and steering angle of the following vehicle, By identifying road surface unevenness information reliably and quickly from the speed, etc., and when the obstacle is resolved, after delivering the “attention information” for a certain period of time and observing it afterwards, by enabling the vibration data threshold It is possible to avoid unnecessary distribution of road surface information and data collection while eliminating sudden errors.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, Based on the technical idea of this invention, various deformation | transformation and a change are further possible.

DESCRIPTION OF SYMBOLS 1 Road surface information collection system 2,3 Suspension 6 Convex part 7 Concave part 10,10 ', 10A, 10B, 10C, 30 Vehicle 11 Vehicle position detection means 12 Vehicle information acquisition means 13 Vibration detection means 14 Vehicle grade information 15 Basic data structure means DESCRIPTION OF SYMBOLS 16 Transmission means 17, 37 Receiving means 18, 38 Navigation apparatus 20 Road surface information collection apparatus 21 Basic data reception part 22 Data processing part 23 Data analysis part 24 Road surface information database 25 Road surface information distribution part 50 Mobile communication network

Claims (4)

A plurality of vehicles that collect basic data of road surface unevenness information, and a data center that analyzes the basic data acquired from the vehicle via wireless communication to form road surface unevenness information and distributes via wireless communication A road surface information collection system,
In a place where the existing road surface unevenness information does not exist, when vibration data exceeding a predetermined threshold is detected in the vehicle, basic data including the vibration data and position information is transmitted to the data center,
The data center that has received the basic data makes a request for transmission of basic data to the following vehicle that passes through the position, and the subsequent vehicle that has received the transmission request substantially cancels the threshold and passes all of the vehicles passing through the position. The basic data from the following vehicle is sent to the data center,
Road surface information collection system that can execute sudden change response functions. The sudden change response function adds a position to road surface unevenness information when vibration data corresponding to road surface unevenness is detected in the basic data of the following vehicle.
b) If the vibration data corresponding to the road surface unevenness is not detected and a steering angle of a predetermined level or more is detected, the transmission request for basic data is continued.
c) If neither the vibration data corresponding to the road surface irregularities nor the steering angle exceeding the predetermined value is detected, it is counted as a release schedule and the transmission request for basic data is continued.
d) If the scheduled release count continues for a predetermined number or more, stop the basic data transmission request.
The road surface information collection system according to claim 1, wherein the function is further executable. The sudden change response function sends a basic data transmission request and attention information to the following vehicle. B) The vibration data corresponding to the road surface unevenness is not detected in the basic data of the following vehicle, and a steering angle of a predetermined level or more is detected. If this happens, continue sending basic data transmission requests and notice information,
d) When the scheduled release count continues for a second predetermined number less than the predetermined number, the distribution of the caution information is stopped while continuing the basic data transmission request, and the planned cancellation count is equal to or greater than the predetermined number. The road surface information collection system according to claim 2, further capable of executing a function of stopping a transmission request for basic data in a continuous case. The vehicle relates to position detection means, vehicle information acquisition means including speed and steering angle, vibration detection means, and vibration data detected by the vibration detection means in relation to vehicle position, vehicle speed, and steering angle. Comprising basic data constituting means for constituting the basic data,
The data center includes a data analysis unit that analyzes the basic data to obtain road surface unevenness information, and a database that stores the road surface unevenness information.
The road surface information collection system as described in any one of Claims 1-3.

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