JP6953805B2 - Road surface information collection system - Google Patents

Description

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

Patent Document 1 discloses that vibration data associated with vehicle traveling is collected, a road surface condition is estimated, and the vibration data is reflected on a screen display of a navigation device or the like. By notifying the driver in advance of the unevenness of the road surface and encouraging the driver to prepare for it, the safety of driving and the maintenance of the loaded cargo are planned.

Japanese Unexamined Patent Publication No. 2010-287044

However, when vehicles with different vehicle classes pass through the same road surface, the waveforms such as the vibration amplitude are different, so it is not possible to grasp the accurate road surface condition simply by collecting vibration data. Patent Document 1 states that if the unique data of each vehicle is acquired in advance, the road surface condition can be grasped from the standard deviation peculiar to the vehicle. However, the basic vibration data for each speed is acquired in advance for each vehicle (vehicle type). Is not realistic.

Moreover, when collecting vibration data, for example, if the vehicle decelerates in front of the uneven position of the road surface and once stops near the passing position, the vibration of the vehicle becomes small, which is not suitable as analysis data of the unevenness of the road surface. Not only that, the reason for stopping other than the unevenness of the road surface must be taken into consideration, so the deceleration process cannot be used as a reference for the following vehicle. Collecting data including cases where it is not suitable as such road surface data may reduce the estimation accuracy of the road surface condition in the subsequent processing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a road surface information collection system that can be expected to improve the road surface condition estimation accuracy by separating data unsuitable for analysis of road surface conditions. There is.

In order to solve the above problems, the present invention includes road surface information including a vehicle that collects basic data of road surface conditions and a data center that analyzes basic data acquired from the vehicle via wireless communication to obtain road surface information. It ’s a collection system,
The vehicle associates the position detecting means, the vehicle information acquisition means including the speed, the vehicle vibration detecting means, and the vibration data detected by the vibration detecting means with the vehicle position, the vehicle speed, and the vehicle rating information. It is equipped with basic data construction means for constructing basic data.
The data center includes a data processing unit that reduces the influence of vehicle speed and vehicle rating from the basic data, a data analysis unit that analyzes data processed by the data processing unit to obtain road surface information, and the road surface information. It has a database to store and
The data processing unit
If the vehicle speed at the detection position of the vibration data is equal to or higher than the specified value, it will be analyzed.
If the vehicle speed at the vibration data detection position is less than the specified value,
If the ratio of stop or quasi-stop immediately before the detection position is equal to or higher than the predetermined ratio and the ratio of stop or quasi-stop immediately after the detection position is equal to or higher than the predetermined ratio, the vibration data at the detection position is excluded from the analysis target.
If the ratio of stop or quasi-stop immediately before the detection position is equal to or higher than the predetermined value and the ratio of stop or quasi-stop immediately after the detection position is less than the predetermined value, the vibration data at the detection position is retained and the detection position is held. Is temporarily set as a target requiring attention, and then when vibration data is detected at the detection position at a vehicle speed equal to or higher than a predetermined value, the temporary setting is canceled and the vibration data is analyzed at the detection position. ,
It is in a road surface information collection system that has a filtering function.

The road surface information collecting system according to the present invention has the following effects due to the above configuration.
By collecting basic data related to vehicle position, vehicle speed, and vehicle class information and reflecting the vibration data in the analysis, the effects of vehicle speed variations during vibration detection and vehicle class variations are reduced. This is advantageous in improving the estimation accuracy of the road surface condition.
Furthermore, when the vehicle speed at the time of vibration detection is less than a predetermined value, it has a filtering function to hold or exclude from the deceleration or stop behavior of the vehicle before and after that, so that data unsuitable for analysis of road surface conditions is sorted and the road surface It is expected to improve the estimation accuracy of the situation, and has the advantage that the data sample can be used for the total data.

It is a block diagram which shows the road surface information collection system which concerns on embodiment of this invention. It is a schematic diagram which shows the road surface information collection system which concerns on embodiment of this invention. It is a conceptual diagram which shows the averaging process and the normalization process in the road surface information collection system which concerns on embodiment of this invention. It is a conceptual diagram which shows the speed correction and averaging processing in the road surface information collection system which concerns on embodiment of this invention. It is a figure which shows the example of the table of the basic data collected in a vehicle, the road surface basic data collected in a data center, and the analyzed road surface information. It is a flowchart which shows the filtering process in the road surface information collection system which concerns on 1st Embodiment of this invention. It is a graph which shows the change of the vehicle speed when passing through a convex portion. It is a figure which shows the display example of the road surface information in a navigation device. It is a flowchart which shows the filtering process in the vehicle side system which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the filtering process in the data center side system which concerns on 2nd Embodiment of this invention.

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

(Vehicle side system configuration)
The system on the vehicle 10 side is composed of a vehicle position detecting means 11, a vehicle information acquiring means 12, a vibration detecting means 13, a vehicle class information 14, a basic data forming means 15, a transmitting means 16, and the like.

The vehicle position detecting means 11 is a GPS receiver that acquires the current position information (longitude, latitude, altitude) using a satellite positioning system, and is a navigation device as a one-chip GPS module that performs from reception of radio waves to position calculation. It is also possible to use the one implemented in 31.

The vehicle information acquisition means 12 includes a vehicle speed sensor that acquires the vehicle speed, and is further composed of a plurality of sensors that acquire parameters related to the running state of the vehicle 10, such as a steering angle sensor, and these are existing sensors that are normally provided in the vehicle 10. Sensors can also be used. These detected values are sent to the basic data configuration means 15 via the vehicle-mounted network (CAN).

The vibration detecting means 13 can use a sensor that detects vertical vibration during vehicle travel that reflects the road surface condition. For example, as shown in FIG. 2, the left and right front wheels and the left and right rear wheels have suspensions 2 and 3. It is composed of the vertical acceleration sensors 13a and 13b provided, the acceleration sensor 13c for detecting the vertical vibration of the vehicle body, and the like. It is also possible to use a pressure sensor that detects the tire pressure of each wheel. The vibration data is sent to the basic data constituting means 15 in the same manner as described above. By equipping each of the front, rear, left and right wheels and suspension with sensors, it is possible to reliably detect that the road surface unevenness exists on only one side of the road.

The vehicle class information 14 is a parameter for eliminating variations in the detection value of the vibration detecting means 13 for each vehicle class, and is stored as a numerical value in the ROM area of the basic data constituent means 15 described later, and is stored as a displacement. It is possible to use a numerical value based on the law or customary vehicle class based on the vehicle body size and the total vehicle weight. In addition to these, quantification may be performed in consideration of the involvement of suspension type and tire standard (size, flatness).

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

The transmission means 16 is a wireless communication terminal for performing wireless communication with the base station 51 of the mobile communication network 50 and transmitting the basic data configured by the basic data configuration means 15 to the data center 20. The transmitting means 16 may be configured as a transmitting / receiving terminal together with the receiving means 17 described later.

(Data center side system configuration)
Next, the system on the data center 20 side is composed of 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 the basic data (indicated by reference numeral 21d in FIG. 5) transmitted from the transmitting means 16 of the vehicle 10 side system, temporarily stores the basic data in the buffer area, and then temporarily stores the basic data in the buffer area. It 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 required", and "caution required temporary setting" according to the vehicle speed at the time of vibration detection and the deceleration and stop status before and after 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 according to 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 the basic data 21d of one vehicle is added), when the status is "normal", the vibration data (amplitude) is divided by the vehicle speed (speed index) for the basic data 21d and averaged. The processing and the normalization processing of dividing by the numerical value (vehicle rating index) corresponding to the vehicle rating information 14 are performed, and the road surface basic data table 22d is updated. If the status is other than "normal", it is excluded from the processing target and the basic data 21d is reserved. The speed index and vehicle class 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 that is a source of road surface information, a road surface information data table 24d obtained by analyzing the road surface basic data table 22d, and a map information database (not shown). It 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 sends the road surface information (24d) stored in the road surface information database 24 to the vehicle 10 or another through the mobile communication network 50 in response to a request from the vehicle side or with updating the map information. Deliver to vehicle 30.

The road surface information (24d) is received by the receiving means 17 and 37 of the vehicles 10 and 30, and the receiving means 17 and 37 overlay the road surface information with characters and icons on the map display screens of the navigation devices 18 and 38. Further, the navigation devices 18 and 38 may be used for voice guidance, and the road surface information can be used for route selection.

(Determination of road surface condition based on vibration detection)
In the case of an unpaved road, irregular vibration is continuously detected by the vibration detecting means 13. On the other hand, even on paved roads, on mountain roads with low traffic volume, the road surface is easily damaged and the frequency of repair work is low, so unevenness on the road surface may be left unpaved, compared to unpaved roads. On paved roads with high driving speeds, sudden irregularities have a large effect on driving and vehicles.

In such a one-off 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 on it, 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 each of these waveforms, immediately after the wheel gets over the convex portion 6, the load is momentarily reduced and the suspension (spring) is extended, so that a valley of the waveform is generated.

On the other hand, when the vehicle 10'passes through the recess 7 formed in the relatively flat road as shown in FIG. 2B, the load is momentarily reduced when the front wheel 2 enters the recess 7. After forming a valley in the waveform, when the front wheel 2 escapes from the recess 7, the vibration peak 7a is detected in the detected waveform by hitting the edge of the recess 7, and similarly, when the rear wheel 3 passes through the recess 7. A peak 7b will appear following a small valley.

As described above, even if the detection level differs depending on the presence or absence and degree of avoidance by steering, the road surface condition can be estimated from a typical waveform pattern in the case of single-shot or sporadic unevenness. Further, in the case of irregularities having the same shape and at equal intervals such as a speed breaker, periodic vibration waveforms are detected by the front and rear acceleration sensors 13a and 13b.

(Vibration data averaging and normalization)
If one vehicle 10 travels on all roads and collects vibration data, highly accurate road surface information can be obtained, but since it takes a long time to collect the data, the frequency of updating the data is also reduced. On the other hand, if vibration data of a large number of vehicles dispersed in each region is collected, 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 that it will occur.

Therefore, by performing averaging and normalization processing on the basic data as follows, by eliminating the requirements for each vehicle and extracting the average vibration data, the estimation accuracy and update frequency of the road surface condition I try to achieve both.

For example, as shown in FIG. 3A, a plurality of vibration data classified into the small vehicle 10A at the same point, a plurality of vibration data classified into the medium-sized vehicle 10B, and a plurality of vibration data classified into the large vehicle 10C. When the vibration data of the above is acquired, each vibration data is divided by the vehicle speed (speed index) at the time of vibration detection, and as shown in FIG. 3 (b), similar vibration data for each of the same vehicle grades. 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 class 10A, 10B, 10C. , As shown in FIG. 3C, one vibration data 60A, 60B, 60C is obtained for each vehicle class 10A, 10B, 10C. At this time, the standard deviation is obtained for each vehicle class, and ± 2 times the standard deviation. Vibration data that deviates from the above shall not be considered.

Next, the vibration data 60A, 60B, and 60C for each vehicle rating 10A, 10B, and 10C are divided by the digitized vehicle rating information (vehicle rating index), respectively, to obtain the vehicle from the vibration data 60A, 60B, 60C. The influence of the disparity is eliminated, almost equal vibration data is obtained, and by averaging them, as shown in FIG. 3 (d), one vibration data normalized according to the road surface condition at the relevant point. 60 is obtained.

Since the vibration data 60 obtained in this way excludes the effects of speed differences, individual differences, and vehicle disparities on individual vibration data, it becomes a general index that reflects the unevenness level, and these vibration patterns can be used. It is stored in the road surface information database 24 together with the unevenness type (convex portion, concave portion, periodic continuous convex portion, irregularly continuous unevenness, etc.) estimated based on the road surface information database 24.

(Velocity correction of vibration data considering the reference speed)
FIG. 4 shows an outline of speed correction and averaging processing at the same point with the same vehicle class (here, small vehicle 10A). In FIG. 3, the influence of the velocity on the time axis is omitted for convenience, but in the actually detected vibration waveforms (6a, 6b, 7a, 7b in FIG. 2), 2 corresponding to the front wheels 2 and the rear wheels 3 The distance between the two peaks depends on the speed and vehicle class (wheelbase). If the vehicle class 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) and peaks as compared with the vibration waveform 62 when the vehicle speed is intermediate. The amplitude of is small. On the contrary, the vibration waveform 63 when the vehicle speed is relatively high has a narrow peak interval (short time axis) and a large peak amplitude as compared with the vibration waveform 62 when the vehicle speed is intermediate.

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

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

In addition, in FIGS. 3 and 5, a plurality of basic data (vibration data A, 6A', 6A "..., 6B, 6B', 6B" ...・ ・, 6C, 6C ′, 6C ″ ...) was described, but even in the situation where only the first basic data was acquired, speed correction and averaging processing based on the reference speed, vehicle class index The normalization process by the above can be carried out, and thereafter, when the basic data is added, those processes are carried out and the road surface information database 24 is updated.

In FIG. 5, basic data (table 21d) collected by the basic data constituent means 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, and the basic data is accumulated in the basic data table 22d. Based on this, the road surface information database 24d is configured and shows the process of being updated.

(Vibration data filtering)
As described above, in analyzing the road surface condition based on the vibration data when the vehicle is running, the influence of the vehicle speed is large. Therefore, if the vehicle speed when passing through the road surface unevenness is extremely slow, the vibration data detected by the vibration detecting means 13 may not reflect the road surface condition.

For example, as shown in FIG. 7A, when the vehicle 10 passes through the convex portion 6, it is traveling at a speed va as shown by the solid line in the graph of FIG. 7B, and the convex portion 6 When decelerating in front, passing through the convex portion 6 at a speed vb equal to or higher than a predetermined speed (first speed v1), and then accelerating to a speed va, the detected vibration data reflects the road surface condition. It can be said that the possibility is great.

However, as shown by the broken line in the graph of FIG. 7B, the vehicle 10'running at the speed va'decelerates in front of the convex portion 6 and temporarily stops, and then the predetermined speed (first). When the vehicle passes through the convex portion 6 at a speed vb'less than the speed v1), the vibration of the vehicle becomes small, so that it is highly possible that the detected vibration data does not reflect the road surface condition.

Further, as shown by the alternate long and short dash line in the graph of FIG. 7B, the vehicle 10'stops temporarily in front of the convex portion 6 and is convex at a speed vb'less than a predetermined speed (first speed v1). If the vehicle stops after passing through the portion 6 and then after the convex portion 6 (10 ″), it is necessary to consider a reason for stopping other than the road surface unevenness, so the data is not suitable for analyzing such road surface information. Need to be sorted.

(First Embodiment)
Therefore, in the road surface information collecting system 1 according to the first embodiment of the present invention, the basic data 21d transmitted from the vehicle 10 is selected based on the vehicle speed V at the vibration detection position and the deceleration and stop conditions before and after the detection position. It has a filtering function to do so. Hereinafter, an example of the filtering process will be described with reference to FIG.

First, when the basic data receiving unit 21 of the data center 20 receives the new basic data 21d transmitted from the vehicle 10, it stores the new basic data 21d in the road surface basic data table 22d of the road surface information database 24 according to the position information (step 100). At this time, the status of "unprocessed" is set in the basic data 21d.

Next, the data processing unit 22 reads the road surface basic data table 22d from the road surface information database 24 (step 101), and determines whether or not the vehicle speed at the vibration detection position is equal to or higher than a predetermined value with respect to the basic data whose status is unprocessed. (Step 102).

If the vehicle speed at the vibration detection position is equal to or higher than a predetermined speed (first speed v1 or higher), it is determined whether or not there is a "temporary setting requiring attention" in the status of other basic data of the road surface basic data table 22d (1st speed v1 or higher). Step 103).

If there is no "temporary setting requiring attention" in the status of other basic data, the status of the basic data is updated from "unprocessed" to "normal", and the process proceeds to road surface unevenness analysis (step 107).

If there is a "temporary setting requiring attention" in other basic data, the normal judgment count is counted as "+1" (104), and it is judged whether or not the total normal judgment count is more than "2" (step 105). If it is 3 or more, the "temporary setting requiring attention" of other basic data is canceled, the status is updated to "needing attention" (step 106), and the process proceeds to road surface unevenness analysis (step 107).

On the other hand, when the vehicle speed at the vibration detection position is less than a predetermined value (less than the first speed v1), it is not suitable for analyzing the road surface shape from the vibration data, so the data is not used for the road surface unevenness analysis. It shifts to "stop (quasi-stop) determination" before and after the vibration detection position, and statistically evaluates the filtering of the vibration detection position (step 121).

First, in order to determine the ratio of stop or quasi-stop immediately before the vibration detection position, it is determined whether or not the speed immediately before the vibration detection position in the basic data is equal to or less than a predetermined speed (second speed v2 or less), and the determination is made. Including the result, it is determined whether or not the ratio of the speed immediately before the position being equal to or less than the predetermined value is equal to or higher than the predetermined value (for example, 70% or more) (step 122). Since the second speed v2 is a threshold value for determining stop or quasi-stop, it is set to be lower than the first speed v1.

When the ratio of the speed immediately before the vibration detection position being less than or equal to the predetermined value is more than or equal to the predetermined value, it is further determined whether or not the ratio of the speed immediately after the vibration detection position being less than or equal to the predetermined value is more than or equal to the predetermined value (for example, 70% or more) (step). 123) If the rate at which the speed immediately after is less than or equal to the predetermined value is also greater than or equal to the predetermined value, it is considered that the low speed passage and the stop immediately after are irrelevant to the road surface condition, and the vehicle is excluded from the statistics of the stop (quasi-stop) determination (step 124). ..

On the other hand, when the ratio of the speed immediately before the vibration detection position in the basic data being less than or equal to the predetermined value is less than the predetermined value (for example, less than 70%), the stop (quasi-stop) determination count is counted as "+1" (step 127), and further. It is determined whether or not the ratio of the speed immediately after the position being equal to or less than the predetermined value is equal to or higher than the predetermined value (for example, 70% or more) (step 128), and if it is equal to or higher than the predetermined speed, the process is terminated as it is.

Regardless of the speed immediately before the vibration detection position, if the ratio of the speed immediately after the position being less than or equal to the specified value is less than the specified value, the status is updated to "Temporary setting requiring attention" (step 125) and the caution required count. Is counted as "+1" (step 126).

By performing the above filtering process on the newly acquired basic data, vibration data below a predetermined speed that does not contribute to the analysis of the road surface condition is excluded from the analysis target, while immediately before and after that. By the stop (quasi-stop) judgment in, the vibration detection position is set as the monitoring target as "temporary setting requiring attention", or is excluded from the statistics, so that it can contribute to the judgment from the next time onward.

(Second Embodiment)
In the above embodiment, the case where the filtering process is exclusively performed in the data center 20 with respect to the basic data acquired through the vehicle 10-side system has been described, but some of the filtering functions are provided by the vehicle-side control unit (ECU). It is also possible to prepare for the basic data configuration means 15. Hereinafter, the filtering process according to the second embodiment of the present invention will be described with reference to FIG.

First, when the vibration is detected by the vibration detecting means 13 of the vehicle 10 and the vibration data is acquired by the basic data forming means 15 (step 200), it is determined whether or not the vehicle speed is equal to or higher than a predetermined value (step 201).

If the vehicle speed is equal to or higher than a predetermined speed (first speed v1 or higher), the status of the basic data is set to "normal" (step 202), and the data is to be transmitted to the data center 20 (step 203).

If the vehicle speed is less than the specified speed (less than the first speed v1), the vibration data is not suitable for analyzing the road surface shape, so the data is not immediately targeted for transmission, and " The process proceeds to "stop (semi-stop) determination", and it is determined whether or not to transmit as data for statistical evaluation (or only the determination result) (step 211).

First, it is determined whether or not the speed immediately before the vibration detection position is less than a predetermined speed (less than the second speed v2) (step 212). If the immediately preceding speed is less than the predetermined speed, it is determined whether or not the immediately preceding speed of the position is less than the predetermined speed (step 213), and if the immediately preceding speed is less than the predetermined speed, the data is excluded from the transmission target data (step 216).

On the other hand, if the speed immediately after the position is not less than the predetermined speed regardless of the speed immediately before, the status is set to "temporary setting requiring attention" (step 215), and is it to be transmitted as data for statistical evaluation? Or, only the information of the caution count "+1" for the position is transmitted to the data center 20 (step 203).

As described above, in the second embodiment, since a part of the filtering process is performed on the vehicle 10 side, the filtering function on the data center 20 side is partially omitted. Hereinafter, the filtering process on the data center 20 side in the second embodiment will be described with reference to FIG.

When the basic data receiving unit 21 of the data center 20 receives the new basic data 21d transmitted from the vehicle 10, it is stored in the road surface basic data table 22d of the road surface information database 24 according to the position information. The status of "normal" or "temporary setting requiring attention" is set in the basic data 21d.

Therefore, when the road surface basic data table 22d is read from the road surface information database 24 into the data processing unit 22, it is first determined whether or not the status of the basic data is set to "normal" (301).

When the status of the basic data is set to "normal", the vehicle speed at the vibration detection position is equal to or higher than the specified value. It is determined whether or not there is (step 302).

If there is no "temporary setting requiring attention" in the status of other basic data, the process immediately shifts to the road surface unevenness analysis (step 306).

If there is a "temporary setting requiring attention" in other basic data, the normal judgment count is counted as "+1" (303), and it is judged whether or not the total normal judgment count is more than "2" (step 304). If it is 3 or more, the "temporary setting requiring attention" of other basic data is canceled, the status is updated to "needing attention" (step 305), and the process proceeds to road surface unevenness analysis (step 306).

On the other hand, if the status of the basic data read into the data processing unit 22 is not set to "normal", the presence or absence of "temporary setting requiring attention" is confirmed (step 311), and "temporary setting requiring attention" is confirmed. If this is done, the caution required count is counted as "+1" (step 312), and if there is no "attention provisional setting", it is excluded from the statistical data (step 313).

FIG. 8 shows an example of display on the navigation device 18. In the case where the shortest road 82 is guided when heading from the current point 80 to the destination 85 via the branch point 81, the road surface unevenness is overlaid with an icon at the points 86 and 87 on the way to drive. The person can grasp the existence of the road surface unevenness in advance, and can take measures such as slowing down and avoiding steering.

Further, depending on the degree of road surface unevenness, roads 83 and 84 may be guided to points 86 and 87 as alternative routes. In that case, the presence of the icon display of the road surface unevenness allows the driver to easily understand the situation in which a route having a long distance and a large height difference is guided as an alternative route.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications and modifications can be made based on the technical idea of the present invention.

1 Road surface information collection system 2, 3 Suspension 6 Convex 7 Concave 8 Map (Navigation device display)
10, 10', 10A, 10B, 10C, 30 Vehicle 11 Vehicle position detection means 12 Vehicle information acquisition means 13 Vibration detection means 14 Vehicle rating information 15 Basic data configuration means 16 Transmission means 17, 37 Reception means 18, 38 Navigation device 20 Road surface information collection device 21 Basic data reception unit 22 Data processing unit 23 Data analysis unit 24 Road surface information database 25 Road surface information distribution unit 50 Mobile communication network

Claims (5)

A road surface information collection system including a vehicle that collects basic data of road surface conditions and a data center that analyzes basic data acquired from the vehicle via wireless communication to obtain road surface information.
The vehicle associates the position detecting means, the vehicle information acquisition means including the speed, the vibration detecting means, and the vibration data detected by the vibration detecting means with the vehicle position, the vehicle speed, and the vehicle rating information. It is equipped with basic data construction means for constructing basic data.
The data center includes a data processing unit that reduces the influence of vehicle speed and vehicle rating from the basic data, a data analysis unit that analyzes data processed by the data processing unit to obtain road surface information, and the road surface information. It has a database to store and
The data processing unit
If the vehicle speed at the detection position of the vibration data is equal to or higher than the specified value, it will be analyzed.
If the vehicle speed at the vibration data detection position is less than the specified value,
If the ratio of stop or quasi-stop immediately before the detection position is equal to or higher than the predetermined ratio and the ratio of stop or quasi-stop immediately after the detection position is equal to or higher than the predetermined ratio, the vibration data at the detection position is excluded from the analysis target.
If the ratio of stop or quasi-stop immediately before the detection position is equal to or higher than the predetermined value and the ratio of stop or quasi-stop immediately after the detection position is less than the predetermined value, the vibration data at the detection position is retained and the detection position is held. Is temporarily set as a target requiring attention, and then when vibration data is detected at the detection position at a vehicle speed equal to or higher than a predetermined value, the temporary setting is canceled and the vibration data is analyzed at the detection position. ,
A road surface information collection system with a filtering function. A road surface information collection system including a vehicle that collects basic data of road surface conditions and a data center that analyzes basic data acquired from the vehicle via wireless communication to obtain road surface information.
The vehicle associates the position detecting means, the vehicle information acquisition means including the speed, the vibration detecting means, and the vibration data detected by the vibration detecting means with the vehicle position, the vehicle speed, and the vehicle rating information. It is equipped with basic data construction means for constructing basic data.
The data center includes a data processing unit that reduces the influence of vehicle speed and vehicle rating from the basic data, a data analysis unit that analyzes the basic data to obtain road surface information, and a database that stores road surface information. And
The basic data structure means
When the vehicle speed at the detection position of the vibration data is equal to or higher than the predetermined value, the basic data is configured as the analysis target at the detection position.
If the vehicle speed at the vibration data detection position is less than the specified value,
If the vehicle speed immediately after the detection position is less than a predetermined value, the basic data at the detection position is excluded from the transmission target .
If the vehicle speed immediately after the detection position is equal to or higher than a predetermined value, the basic data at the detection position is not the analysis target but the transmission target as a tentative setting requiring attention.
Has a filtering function
The data processing unit targets the basic data to be analyzed on the vehicle side, while holding the basic data that has been provisionally set to require attention, and receives a predetermined number of basic data to be analyzed at the detection position. A road surface information collection system having a filtering function that cancels the temporary setting and targets the reserved basic data for analysis. When the filtering function of the data processing unit receives the basic data to be analyzed two or more times at the detection position set as the temporary setting requiring attention, the temporary setting requiring attention is canceled and the reserved basic data is analyzed. The road surface information collection system according to claim 2, which is the target. The filtering function of the data processing unit cancels the temporary setting when vibration data is detected twice or more at a vehicle speed of a predetermined value or more at a detection position temporarily set for the object requiring attention. It is analyzed for vibration data at the detection position, the road information collection system according to claim 1, wherein. The data processing unit includes a function of performing an averaging process of applying a speed index obtained by dividing a vehicle speed by a reference speed to the vibration data and a normalization process of dividing the vehicle class by a numerical value corresponding to the vehicle class. The road surface information collection system according to any one of 1 to 4.

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