JP6258278B2 - Electronic device system, electronic device and method - Google Patents

Electronic device system, electronic device and method Download PDF

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JP6258278B2
JP6258278B2 JP2015212838A JP2015212838A JP6258278B2 JP 6258278 B2 JP6258278 B2 JP 6258278B2 JP 2015212838 A JP2015212838 A JP 2015212838A JP 2015212838 A JP2015212838 A JP 2015212838A JP 6258278 B2 JP6258278 B2 JP 6258278B2
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vehicle
road surface
precipitation
information
weather information
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JP2017084160A (en
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桃崎 浩平
浩平 桃崎
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株式会社東芝
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  Embodiments described herein relate generally to an electronic device system, an electronic device, and a method.

  Generally, in order to prevent accidents in vehicles such as automobiles and motorcycles, it is necessary to drive the vehicles safely.

  However, the criterion of whether or not to drive safely varies depending on the weather. Specifically, when the weather is rainy and the vehicle travels on a wet road surface, the braking distance (that is, the stop distance) becomes longer and a skid is likely to occur than when traveling on a dry road surface. It becomes. Also, under conditions where it is raining heavily, the visibility is poor and the probability of an accident increases.

  For this reason, depending on the weather, safe driving may not be possible without traveling at a lower speed than usual.

JP 2012-038006 A

  Accordingly, the problem to be solved by the present invention is to provide an electronic device system, an electronic device, and a method that can support driving of the vehicle in consideration of the weather at the point where the vehicle is traveling. is there.

An electronic device system according to an embodiment is an electronic device including an in-vehicle device mounted on a vehicle including a GPS module, and a server device that performs wireless communication with the in-vehicle device, and the server device includes a receiving unit, A weather information storage unit, precipitation condition estimation means, road surface condition estimation means, and control means are provided. The receiving unit receives position information indicating the position of the vehicle acquired from the GPS module from the in- vehicle device . The weather information storage unit is periodically updated, and stores weather information related to the weather in each region including the precipitation amount at the time of the update and a predicted value of the precipitation amount after a predetermined period. The precipitation condition estimating means, with the weather information about the weather including areas the position indicated by the previous SL-position location information acquired from the weather information storage unit, the precipitation contained in the latest weather information of the area The current precipitation situation is estimated from the predicted value . The road surface state estimating means is based on the past weather information within a predetermined period from the current state of the area acquired from the weather information storage unit and the current precipitation situation estimated by the precipitation situation estimation means. The road surface state where the vehicle is traveling is estimated. The control means holds a plurality of speed threshold values according to various road surface conditions, and transmits the speed threshold value according to the road surface condition estimated by the road surface condition estimation means to the in-vehicle device, so that the road surface condition The speed of the vehicle is controlled so that the vehicle travels at a speed that allows safe traveling .

The figure for demonstrating the network structure of the electronic device system which concerns on 1st Embodiment. The figure which shows an example of the system configuration | structure of a vehicle-mounted apparatus. The figure which shows an example of the system configuration | structure of a server apparatus. The figure which shows an example of a function structure of a server apparatus. The flowchart which shows an example of the process sequence of a server apparatus. The figure which shows an example of a function structure of the server apparatus contained in the electronic device system which concerns on 2nd Embodiment. The flowchart which shows an example of the process sequence of a server apparatus. The figure which shows an example of a function structure of the server apparatus contained in the electronic device system which concerns on 3rd Embodiment. The flowchart which shows an example of the process sequence of a server apparatus. The figure which shows another example of the function structure of the server apparatus contained in the electronic device system which concerns on 3rd Embodiment.

  Hereinafter, each embodiment will be described with reference to the drawings.

(First embodiment)
First, a network configuration of an electronic device system (operation control system) according to the first embodiment will be described with reference to FIG. As shown in FIG. 1, the electronic system according to the present embodiment includes an in-vehicle device 10 and a server device 20.

  The in-vehicle device 10 is an electronic device mounted on the vehicle 1 driven and driven by a driver, and is realized as a drive recorder or a car navigation system, for example. The in-vehicle device 10 may be a mobile terminal such as a mobile phone, a smartphone, a tablet computer, or a PDA, a personal computer, or the like. The in-vehicle device 10 may be detachable from the vehicle 1 or may be incorporated in the vehicle 1.

  The vehicle 1 on which the in-vehicle device 10 is mounted includes, for example, a car, an electric car, a motorcycle, a ship, and the like. In addition, the vehicle 1 may be a light vehicle such as a bicycle (including an assist) that travels mainly by human power.

  The server device 20 is an electronic device that can communicate with the in-vehicle device 10 via a network 30 such as the Internet or a 3G / LTE communication network. In addition, the server device 20 has a function of executing communication with other server devices in order to acquire weather information and the like described later.

  The electronic device system according to the present embodiment has a function of supporting driving of the vehicle 1 on which the in-vehicle device 10 is mounted.

  FIG. 2 shows a system configuration of the in-vehicle device 10 shown in FIG. As shown in FIG. 2, the in-vehicle device 10 includes an SOC (System On a Chip) 11, a RAM 12, a flash memory 13, a power circuit 14, an acceleration sensor 15, a gyro sensor 18, an inter-vehicle distance sensor 19, and a GPS (Global Positioning System). The module 16 and the communication module 17 are provided.

  The SOC 11 includes a processor that controls the operation of each component in the in-vehicle device 10. The SOC 11 executes various software loaded from the flash memory 13 to the RAM 12, for example. Note that the RAM 12 and the flash memory 13 may be provided in the SOC 11.

  The power supply circuit 14 controls power supplied to the in-vehicle device 10 from a main battery or a built-in battery (not shown).

  The acceleration sensor 15 is a sensor for measuring the acceleration acting on the vehicle 1 at regular time intervals (for example, every 0.1 second).

  The gyro sensor 18 is a sensor for measuring an angular velocity or an angular acceleration acting on the vehicle 1 at regular time intervals (for example, every 0.1 second).

  The inter-vehicle distance sensor 19 is a sensor using a radar or a camera for measuring the inter-vehicle distance in front of the vehicle 1 at regular time intervals (for example, every second). In the camera that captures the front, the vehicle ahead is recognized from the stereo camera image or the camera moving image, and the inter-vehicle distance is estimated.

  The GPS module 16 receives a GPS signal transmitted from each of a plurality of GPS satellites via an antenna (not shown) at regular time intervals (for example, every second), and uses the GPS signal to transmit the vehicle 1 The current position of is calculated. According to this, the in-vehicle device 10 can acquire information indicating the current position calculated by the GPS module 16 (hereinafter referred to as position information). In addition, the position shown by the vehicle-mounted apparatus 10 shall be represented by the latitude and the longitude, for example.

  The communication module 17 is a module configured to execute wireless communication with the server device 20 and the like via the network 30 described above. With this communication module 17, the in-vehicle device 10 transmits the position information described above to the server device 20. Further, the in-vehicle device 10 uses, for example, information indicating the speed of the vehicle 1 on which the in-vehicle device 10 is mounted (hereinafter referred to as speed information) as information on the current traveling state of the vehicle 1 (traveling state information) in the server device 20. It is also possible to transmit. The speed of the vehicle 1 may be acquired from the vehicle 1 or the like, or may be acquired using another sensor or the like. Further, information indicating the acceleration of the vehicle 1 acquired from the acceleration sensor 15 or the angular velocity or acceleration of the vehicle 1 acquired from the gyro sensor 18 and the direction in which they occur (hereinafter referred to as acceleration information) is also used as the traveling state information. Good. Further, information indicating the front inter-vehicle distance of the vehicle 1 acquired from the inter-vehicle distance sensor 19 (hereinafter, inter-vehicle distance information) may be used as the traveling state information.

  FIG. 3 shows a system configuration of the server apparatus 20 shown in FIG. As shown in FIG. 3, the server apparatus 20 includes a CPU 21, a nonvolatile memory 22, a main memory 23, a BIOS-ROM 24, a system controller 25, a wireless communication device 26, an EC 27, and the like.

  The CPU 21 is a processor that controls the operation of each component in the server device 20. The CPU 21 executes various programs (software) loaded into the main memory 23 from the nonvolatile memory 22 that is a storage device.

  The CPU 21 also executes a basic input / output system (BIOS) stored in the BIOS-ROM 24. The BIOS is a program for hardware control.

  The system controller 25 is a device that connects between the local bus of the CPU 21 and each component. The system controller 25 also includes a memory controller that controls access to the main memory 23.

  The wireless communication device 26 is a device configured to perform wireless communication with the in-vehicle device 10 and an external server device.

  The EC 27 is a one-chip microcomputer including an embedded controller configured to execute power management of the server device 20.

  FIG. 4 is a block diagram mainly showing a functional configuration of the server device 20 included in the electronic device system according to the present embodiment.

  As illustrated in FIG. 4, the server device 20 includes a reception unit 201, a weather information storage unit 202, a precipitation situation estimation unit 203, a road surface state estimation unit 204, and a control unit 205.

  In the present embodiment, some or all of the receiving unit 201, the precipitation state estimating unit 203, the road surface state estimating unit 204, and the control unit 205 may be implemented by causing the CPU 21 to execute a dedicated program, that is, by software. Alternatively, it may be realized by hardware such as an IC (Integrated Circuit) or may be realized as a combination configuration of software and hardware.

  Moreover, in this embodiment, the weather information storage part 202 shall be stored in the non-volatile memory 22, for example.

  The server device 20 (including the electronic device system) according to the present embodiment has a function of controlling the driving of the vehicle 1 in consideration of the weather in order to support the driving of the vehicle 1 with the configuration illustrated in FIG. 4.

  The receiving unit 201 receives information (hereinafter referred to as position information) indicating the current position of the vehicle 1 calculated by the GPS module 16 included in the in-vehicle device 10 from the in-vehicle device 10.

  The weather information storage unit 202 stores weather information related to the weather in each region where the vehicle 1 travels. The weather information stored in the weather information storage unit 202 includes, for example, the precipitation amount of each local region in the region and the predicted value of the precipitation amount of the local region after a predetermined period has elapsed.

  Here, the Japan Meteorological Agency provides various numerical data and forecast data related to the weather. For example, in a system called “(High Resolution) Precipitation Nowcast”, instantaneous precipitation intensity for each local area divided into a grid of 250 m from east to west and north to south using observation data from the meteorological radar of the Japan Meteorological Agency. Weather information including current state analysis values such as precipitation per unit time such as 5 minutes and predicted values of precipitation up to 30 minutes ahead in 5 minute increments is created. The weather information is updated at intervals of 5 minutes and can be received by the server device 20 each time the weather information is updated. In addition, this weather information is grouped for each area (tile) of about 40 km from east to west and north and south, and the included 25600 grid areas (local areas) are compressed data. It is also possible to exclude (tile) data and store only the data of the necessary area. For example, the vehicle may be selectively stored according to conditions such as a land portion where an automobile travels and a sea portion where the vehicle does not travel, a region where the target vehicle exists and a region where the target vehicle does not exist.

  For this reason, in this embodiment, the weather information provided in the above-mentioned precipitation nowcast is utilized as weather information. Thus, weather information (meteorological information) received by the server device 20 every time it is updated is stored in the weather information storage unit 202. In other words, the weather information storage unit 202 stores a history of weather information within a predetermined period. The weather information includes information indicating the updated time (reference time).

  For example, a predicted value of precipitation up to 6 hours ahead in 1 hour increments provided as “(1 km mesh) precipitation short-term forecast” may be used as weather information.

  The precipitation situation estimation unit 203 associates the weather information related to the area including the position indicated by the position information received by the receiving unit 201 with the latitude and longitude of each lattice area (local area), thereby the position (point). Weather information relating to the weather information is extracted and acquired from the weather information storage unit 202. The precipitation condition estimation unit 203 estimates the current precipitation condition at the position (point) indicated by the position information received by the reception unit 201 based on the precipitation amount and the predicted value included in the acquired weather information.

  The road surface state estimation unit 204 calculates the latitude of each lattice region (local region) with respect to past weather information within a predetermined period from the present regarding the region including the position indicated by the position information received by the receiving unit 201. By associating with the longitude, past weather information regarding the position (point) is extracted and acquired from the weather information storage unit 202. The road surface state estimation unit 204 is based on the current precipitation state estimated by the precipitation state estimation unit 203 and the acquired past weather information, the state of the road surface on which the vehicle 1 is traveling (hereinafter referred to as road surface state). Is estimated.

  The control unit 205 controls the driving of the vehicle 1 based on the road surface state (that is, weather information) estimated by the road surface state estimation unit 204.

  Next, the processing procedure of the server device 20 (including the electronic device system) will be described with reference to the flowchart of FIG.

  In the weather information storage unit 202, it is assumed that weather information (history) within a predetermined period is accumulated as described above. The weather information stored in the weather information storage unit 202 is periodically updated as described above, and the precipitation amount (current state analysis value) at the time of the update and after a predetermined period (for example, 5 Precipitation values for up to 30 minutes in increments) are included.

  Here, when the vehicle 1 equipped with the in-vehicle device 10 is traveling, the in-vehicle device 10 periodically transmits position information to the server device 20 via the communication module 17.

  In this case, the receiving unit 201 receives the position information transmitted by the in-vehicle device 10 (block B1). Hereinafter, a region including the position indicated by the position information received in the block B1 (that is, a region including a point corresponding to the latitude and longitude representing the position) is referred to as a target region.

  Next, the precipitation state estimation unit 203 and the road surface state estimation unit 204 obtain weather information regarding the weather in the target area from the weather information storage unit 202 (block B2). Specifically, the precipitation situation estimation unit 203 acquires the latest weather information of the target area among the weather information periodically updated as described above. Moreover, the road surface state estimation part 204 acquires the past weather information of the target area in the period defined beforehand from the present among the weather information updated regularly.

  The precipitation situation estimation unit 203 estimates the precipitation situation based on the latest weather information of the target area acquired in block B2 (block B3). In this case, the precipitation state estimation unit 203 estimates the current precipitation state from the precipitation amount and the predicted value (for example, the predicted value of precipitation amount 5 to 10 minutes ahead) included in the latest weather information of the target area.

  Here, assuming that the time (reference time) updated to the latest weather information is 10:00, the latest weather information in the target area (that is, the weather information updated at 10:00) Precipitation at 10:00 and the predicted value of precipitation at 10:05 are included. In this case, assuming that the current time is 10:04, the precipitation state estimation unit 203 includes the precipitation amount (that is, the precipitation amount at 10:00) included in the latest weather information of the target area and the predicted value. The larger one of the values (that is, the predicted precipitation amount of 10:05) is estimated as the current precipitation state (precipitation amount).

  Further, if the current time is 10:07 and the weather information updated at 10:00 is the latest weather information, for example, the predicted value of precipitation of 10:05 and the precipitation of 10:10 The larger one of the predicted values of the amount may be estimated as the current precipitation situation.

  In addition, the estimation process of the precipitation condition demonstrated here is an example, For example, a precipitation condition may be estimated based on the precipitation amount contained in the newest weather information of an object area, the average value of a predicted value, etc. FIG.

  Next, the road surface state estimation unit 204 estimates the road surface state in which the vehicle 1 is traveling based on the past weather information of the target area acquired in the block B2 and the current precipitation situation estimated in the block B3. (Block B4). The road surface state estimated by the road surface state estimation unit 204 includes, for example, a state A, a state AB, and a state B. State A indicates that the road surface is dry. State AB indicates that the road surface has started to rain. State B indicates that the road surface is wet.

  The road surface state estimation unit 204 determines whether the total precipitation amount included in the current precipitation situation (precipitation amount) and the past weather information of the target area exceeds a predetermined reference value, for example. Based on this, it is estimated whether the road surface state is the state A, the state AB, or the state B. In addition, the road surface state estimation unit 204 identifies the road surface state by specifying a time zone during which rain has fallen within a predetermined period based on the current precipitation situation and precipitation included in the past weather information of the target area. The present road surface condition may be estimated based on a calculation model such as a weighted average of past precipitation conditions.

  The control unit 205 controls the driving of the vehicle 1 based on the road surface state estimated in the block B4 (block B5).

  Specifically, for example, the control unit 205 travels below a predetermined speed (hereinafter referred to as a speed threshold corresponding to the road surface condition) that can safely travel in the road surface state estimated in the block B4. The speed of the vehicle 1 is controlled. The speed threshold value is assumed to be stored in the control unit 205 in advance for each road surface state (state A, state AB, state B, etc.).

  In this case, in order to control the speed of the vehicle 1, the control unit 205 transmits a speed threshold corresponding to the road surface condition to the in-vehicle device 10. According to this, the speed of the vehicle 1 can be controlled so that the vehicle 1 travels at a speed threshold value or less according to the road surface condition, for example, by an operation control device (not shown) that can control the operation of the vehicle 1. The operation control device is only required to be able to control the speed of the vehicle 1, and is incorporated in the vehicle 1 (or the in-vehicle device 10), for example, and suppresses acceleration or automatically activates a brake. Thus, the speed shall be controlled.

  As described above, the in-vehicle device 10 can transmit speed information indicating the speed of the vehicle 1 to the server device 20 as travel state information. As a result, the control unit 205 determines that the speed of the vehicle 1 indicated by the speed information in the traveling state information received by the server device 20 (the receiving unit 201 included therein) exceeds a threshold corresponding to the road surface condition. In such a case, the vehicle 1 may execute control such that an overspeed warning is output. In this case, notifications and warnings may be output in stages by using a plurality of threshold values.

  The in-vehicle device 10 can also transmit acceleration information indicating the acceleration and angular acceleration of the vehicle 1 as the traveling state information to the server device 20, and the control unit 205 can control the vehicle 1 indicated by the acceleration information in the traveling state information. When it is determined that the acceleration or angular acceleration exceeds a threshold value corresponding to the road surface condition, control may be executed such that a warning for sudden acceleration / deceleration, sudden steering, or excessive curve speed is output.

  Furthermore, the in-vehicle device 10 can also transmit inter-vehicle distance information indicating the front inter-vehicle distance of the vehicle 1 as the traveling state information to the server device 20, and the control unit 205 can control the vehicle 1 indicated by the inter-vehicle distance information in the traveling state information. When it is determined that the front inter-vehicle distance is less than the threshold value according to the road surface condition, a control may be executed such that a warning of insufficient inter-vehicle distance is output.

  Further, the threshold value corresponding to the road surface condition may be a value that varies depending on the type of the vehicle 1 (for example, a two-wheeled vehicle, a normal vehicle, a large vehicle, or the like). Note that the type of the vehicle 1 may be set in advance before the vehicle 1 travels, for example. In addition, for example, the threshold value may be further changed according to a time zone with a high risk of accident such as nighttime.

  As described above, in the present embodiment, position information indicating the position of the vehicle 1 is acquired, weather information regarding the weather in a region including the position of the vehicle 1 is acquired, and the driving of the vehicle 1 is performed based on the weather information. To control. In the present embodiment, with such a configuration, driving of the vehicle 1 can be supported in consideration of the weather at the point (region) where the vehicle 1 is traveling.

  Specifically, the latest weather information is acquired from the regularly updated weather information, and the current precipitation situation is estimated based on the precipitation amount and the predicted value included in the latest weather information. Further, past weather information within a predetermined period is acquired from the current weather information that is regularly updated, and the vehicle 1 is traveling based on the estimated precipitation status and the past weather information. Estimate the road surface condition (road surface condition of the target area). In the present embodiment, with such a configuration, the driving of the vehicle 1 can be controlled based on the current road surface condition.

  In this case, for example, based on a speed threshold value corresponding to the estimated road surface condition, the speed of the vehicle 1 can be controlled so that the vehicle 1 travels below the threshold value. In the present embodiment, for example, a travel route (and map information) set in a car navigation system or the like may be used. In this case, for example, it is also possible to control the curve passing speed by providing a speed threshold for passing through the curve separately from the above-described threshold.

  Further, based on acceleration and angular acceleration threshold values according to the estimated road surface condition, acceleration / deceleration and steering operation of the vehicle 1 are controlled so that the vehicle 1 travels below the threshold value, and a curve passing speed is controlled. It is also possible to do. Further, based on the threshold value of the front inter-vehicle distance corresponding to the estimated road surface condition, it is also possible to control the acceleration / deceleration of the vehicle 1 so that the vehicle 1 travels while maintaining the front inter-vehicle distance above the threshold value.

  Moreover, it is also possible to output a warning based on a threshold value such as a speed according to the road surface condition and traveling state information (speed information or the like) regarding the traveling state of the vehicle 1. For example, this warning is assumed to prompt the driver to decrease the speed, but other warnings may be output as long as they relate to safe driving (that is, support driving).

  Further, for example, in the case of a motorcycle, the influence of the road surface condition is greater than that of an automobile or the like. Therefore, in this embodiment, the threshold value according to the above-described road surface state is different depending on the type of the vehicle 1. Specifically, when the road surface state is state B, the threshold value of the motorcycle is set to be smaller than the threshold value of the automobile. According to this, driving can be appropriately supported according to the type of the vehicle 1.

  In the present embodiment, the driving of the vehicle 1 is controlled based on the road surface state estimated by the road surface state estimating unit 204, but the current precipitation state estimated by the precipitation state estimating unit 203 is used. The configuration may be such that the operation of the vehicle 1 is controlled based on this. In the case of such a configuration, for example, it is possible to perform control to reduce the speed of the vehicle 1 in the case of the weather with a large amount of precipitation. Further, the driving of the vehicle 1 may be controlled based on both the current precipitation situation estimated by the precipitation situation estimation unit 203 and the road surface state estimated by the road surface state estimation unit 204. According to such a configuration, for example, when there is a lot of precipitation, the visibility is poor and the road surface state is a wet state, as compared with the case where it is simply estimated that the road surface state is a wet state. In addition, it is possible to perform control that lowers the speed of the vehicle 1.

  In the present embodiment, the weather information stored in the weather information storage unit 202 has been described as including precipitation and predicted values. However, according to the regional weather observation system (AMeDAS), for example, the region (observation point) Observation values such as air temperature, wind speed, and sunshine duration are provided every 10 minutes or every hour. When such an observation value (especially temperature) is further used as weather information, the road surface state estimation unit 204 can also estimate a state C indicating that the road surface is frozen, for example. It is. Thus, when it is estimated that the road surface state where the vehicle 1 is traveling is the state C, the vehicle travels at a lower speed than the state B described above (the road surface state is a wet state). Thus, the speed of the vehicle 1 can be controlled. The temperature around the vehicle 1 is estimated by further using information such as altitude at the position (latitude and longitude) indicated by the position information received by the receiving unit 201 in addition to the above-described observation values, for example. It doesn't matter.

  Furthermore, in the present embodiment, it is assumed that the road surface state is estimated using only the weather information related to the weather in one area (target area) including the position indicated by the position information received by the receiving unit 201. However, for example, the road surface state of the target region may be estimated based on weather information (precipitation state and road surface state) of a point (region) in front of which the vehicle 1 was traveling. In addition, the point (area) in front of which the vehicle 1 was traveling may be specified by accumulating the position information received by the receiving unit 201. For example, the traveling route (and map information) described above may be used. Etc. may be specified.

  Further, when the travel route and the map information are used, the road surface state of the area where the vehicle 1 travels later may be estimated in advance using the predicted value of the time zone to reach the area. Is possible.

  Further, when it is determined that the vehicle 1 travels a predetermined point (for example, a tunnel or the like) based on the travel route, map information, or the like, the vehicle 1 is determined depending on the road surface condition or the like at a point in front of the point. The road surface state where the vehicle is traveling may be estimated.

  Furthermore, when the traffic volume is low, it takes time to be affected by the road surface condition at the previous point. Conversely, even when it is raining, it may take time for the road surface to become wet when there is a lot of traffic. For this reason, for example, it is possible to adopt a configuration in which the road surface state is estimated based on traffic information (traffic congestion information, etc.) relating to the traffic volume. The traffic information (traffic volume) is information that can be received from an external server device or the like, and may be actually measured or estimated from other information.

  Further, the present embodiment may be applied to automatic driving of the vehicle 1. In this case, it becomes possible to automatically change the speed of the vehicle 1 in the automatic driving, the curve passing speed, the front inter-vehicle distance, the control target value of the steering wheel and the brake according to the road surface condition. Furthermore, you may reflect a road surface state in the operation plan in automatic driving | operation.

  In the present embodiment, it has been described that the operation of the vehicle 1 is controlled by the server device 20 executing the processing illustrated in FIG. 5, but part or all of the processing illustrated in FIG. May be executed on the side. Moreover, although the server apparatus 20 in this embodiment was demonstrated as what is one apparatus, each function part contained in the server apparatus 20 demonstrated in FIG. 4, for example is distribute | distributed and arrange | positioned at several separate apparatuses. It doesn't matter. That is, this embodiment may have a configuration other than the above as long as it controls the driving of the vehicle 1 based on the weather information regarding the weather in the region including the position of the vehicle 1 as described above. .

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. FIG. 6 is a block diagram mainly showing a functional configuration of the server device 20 included in the electronic device system (evaluation value calculation system) according to the present embodiment. In FIG. 6, the same parts as those in FIG. 4 described above are denoted by the same reference numerals, and detailed description thereof is omitted. Here, parts different from FIG. 4 will be mainly described.

  Further, the network configuration of the electronic device system according to the present embodiment, the system configuration of the in-vehicle device 10 and the system configuration of the server device 20 are the same as those in the first embodiment described above. explain.

  As illustrated in FIG. 6, the server device 20 includes an evaluation value calculation unit 211 and an evaluation in addition to the reception unit 201, the weather information storage unit 202, the precipitation state estimation unit 203, and the road surface state estimation unit 204 illustrated in FIG. 4 described above. A value storage unit 212 is included.

  In this embodiment, the evaluation value calculation unit 211 is realized by causing the CPU 21 to execute a dedicated program, that is, software. The evaluation value calculation unit 211 may be realized by hardware such as an IC, or may be realized as a combination configuration of software and hardware.

  In the present embodiment, the evaluation value storage unit 212 is stored in, for example, the nonvolatile memory 22.

  The server device 20 according to the present embodiment has a function of evaluating the traveling of the vehicle 1 with the configuration shown in FIG. Here, in order to support the driving of the vehicle 1, the driving of the driver with respect to the vehicle 1 is evaluated.

  The evaluation value calculation unit 211 includes weather information (estimation results by the precipitation state estimation unit 203 and the road surface state estimation unit 204) regarding the weather including the position indicated by the position information received by the reception unit 201, and the above-described traveling state Based on the information, a value for evaluating the driving of the driver (hereinafter referred to as an evaluation value) is calculated. In the present embodiment, the traveling state information includes the speed information described above, information indicating acceleration and angular acceleration measured by the acceleration sensor 15 and the gyro sensor 18 provided in the in-vehicle device 10 (hereinafter referred to as acceleration information), and It is assumed to include information indicating the front inter-vehicle distance measured by the inter-vehicle distance sensor 19 (hereinafter referred to as inter-vehicle distance information). The acceleration information included in the traveling state information is information indicating the direction in which the acceleration occurs together with the acceleration acting on the vehicle 1, for example. Furthermore, accident occurrence information that is detected based on acceleration information or notified by operating an emergency call button (not shown) may also be included.

  The evaluation value calculated by the evaluation value calculation unit 211 is stored in the evaluation value storage unit 212.

  Next, a processing procedure of the server device 20 (including the electronic device system) will be described with reference to the flowchart of FIG.

  First, the processes of blocks B11 to B14 corresponding to the processes of blocks B1 to B4 shown in FIG. 5 are executed.

  Next, the evaluation value calculation unit 211 sets a threshold value (hereinafter referred to as an evaluation threshold value) for evaluating whether or not the driver's driving is safe driving based on the road surface state estimated in block B14. (Block B15). The evaluation threshold includes a speed at which the driver can drive safely and an inter-vehicle distance, an acceleration for determining a curve passing speed, a sudden handle, a sudden brake, and the like. Assume that the evaluation threshold value is stored in advance in the evaluation value calculation unit 211 for each road surface state (state A, state AB, state B, etc.) described above.

  In the present embodiment, a speed at which the driver can drive safely is set as the evaluation threshold, and the evaluation threshold includes the various thresholds described in the first embodiment. Different values may be used, or the same value may be used.

  When the processing of block B15 is executed, the following processing after block B16 is executed.

  First, the receiving unit 201 receives travel status information (block B16). The traveling state information includes the speed information indicating the speed of the vehicle 1 described above, the inter-vehicle distance information indicating the front inter-vehicle distance of the vehicle 1, the acceleration information indicating the acceleration and angular acceleration of the vehicle 1, and the like.

  Next, the evaluation value calculation unit 211 calculates the above-described evaluation value based on the evaluation threshold set in the block B15 and the received traveling situation information (block B17).

  Here, the speed information included in the traveling state information indicates the speed of the vehicle 1. According to this speed information, the evaluation value calculation unit 211 uses the evaluation threshold value to determine whether or not the speed of the vehicle 1 exceeds a speed that can be said to be safe driving, that is, the driver is safe driving. It is possible to determine whether the vehicle is not driven at such a speed that cannot be performed. Hereinafter, this determination process is referred to as a first determination process.

  The acceleration information included in the traveling state information indicates the acceleration of the vehicle 1. According to this acceleration information, the evaluation value calculation unit 211 uses the evaluation threshold value to determine whether or not the acceleration of the vehicle 1 exceeds an acceleration that can be said to be safe driving, that is, the driver is safe driving. It is possible to determine whether or not acceleration is not performed to such an extent that it cannot be performed. Hereinafter, this determination process is referred to as a second determination process.

  Furthermore, when the direction of the acceleration indicated by the acceleration information is, for example, a lateral direction with respect to the traveling direction of the vehicle 1, it can be determined that the vehicle 1 is passing the curve. That is, according to the speed information and the acceleration information, the evaluation value calculation unit 211 uses the evaluation threshold value to determine whether the speed of the vehicle 1 that is passing the curve exceeds the speed at which it can be said that it is safe driving. It can be determined whether or not. Hereinafter, this determination process is referred to as a third determination process.

  Further, according to the acceleration indicated by the acceleration information and the direction of the acceleration, the evaluation value calculation unit 211 can determine that the vehicle 1 has been suddenly steered or braked using the evaluation threshold value. it can. Hereinafter, this determination process is referred to as a fourth determination process. In addition, when other information that can determine that the sudden steering or the sudden braking has been performed can be obtained, the fourth determination process may be executed based on the information.

  Further, the inter-vehicle distance information included in the traveling state information indicates a front inter-vehicle distance of the vehicle 1. According to the inter-vehicle distance information, the evaluation value calculation unit 211 uses the evaluation threshold value to determine whether the front inter-vehicle distance of the vehicle 1 is less than the inter-vehicle distance that can be said to be safe driving, that is, the driver is safe. It is possible to determine whether or not the vehicle is traveling at an insufficient distance between the vehicles that cannot be driven. Hereinafter, this determination process is referred to as a fifth determination process.

  The evaluation value calculation unit 211 calculates the evaluation value by comprehensively considering the results of the first to fifth determination processes described above. For example, the first to fifth determination processes are executed a plurality of times based on a plurality of travel status information received within a predetermined period, so that the processing result is obtained for each of the first to fifth determination processes. A value corresponding to may be calculated, and an average value of the calculated values may be used as the evaluation value. Also, the evaluation value may be calculated by changing the weights for the first to fifth determination processes. This weight may be changed according to, for example, the characteristics of the area in which the vehicle 1 is traveling (many straight roads, many curves, many slopes, etc.).

  Here, the evaluation value is calculated by executing the first to fifth determination processes. However, for example, at least one of the first to fifth determination processes is executed. The evaluation value may be calculated by In addition to the first to fifth determination processes, another process may be executed. That is, the evaluation value calculation process described here is an example, and the evaluation value may be calculated by another process.

  The evaluation value calculated by the evaluation value calculation unit 211 may be a numerical value, a predetermined rank, or the like, for example.

  The evaluation value calculated in block B17 is stored in the evaluation value storage unit 212 (block B18). The evaluation value stored in the evaluation value storage unit 212 can be notified to the driver, for example. According to this, it is possible to urge a driver with a low evaluation value who is driving without considering the road surface condition or the like to drive safely. In this case, a warning may be output to the driver whose evaluation value is lower than a predetermined value, for example, via the in-vehicle device 10 or the like.

  In addition, when it is set as the structure which accumulate | stores the positional information and driving | running | working status information received in the receiving part 201 with the information (time information) which shows the time which received the said positional information and driving | running | working status information, block B12-B15 , B17 and B18 may be executed after the traveling of the vehicle 1 is finished, for example.

  As described above, in the present embodiment, an evaluation value for evaluating the driving of the driver is calculated based on the weather information regarding the weather in the region including the position of the vehicle 1 and the traveling state information of the vehicle 1. According to such a configuration, for example, an evaluation threshold value is set according to the road surface state on which the vehicle 1 estimated based on weather information is traveling, and the speed and acceleration included in the evaluation threshold value and the traveling state information are It becomes possible to evaluate the driving | operation of a driver | operator by comparing. Such an evaluation result (evaluation value) can be used, for example, in order to improve the driving of the driver, and can support the driving of the vehicle 1 by the driver.

  Similar to the first embodiment described above, different evaluation threshold values may be set according to the type and time zone of the vehicle 1.

  In the present embodiment, the server device 20 has been described as calculating the evaluation value by executing the processing shown in FIG. 7, but part or all of the processing shown in FIG. It does not matter if it is executed. Moreover, although the server apparatus 20 in this embodiment was demonstrated as what is one apparatus, each function part contained in the server apparatus 20 demonstrated in FIG. 6, for example is distributed and arrange | positioned at several separate apparatuses. It doesn't matter. In other words, the present embodiment is not limited to the above as long as it evaluates the driving of the driver with respect to the vehicle 1 based on the weather information and the traveling state information regarding the weather in the region including the position of the vehicle 1 as described above. It may be a configuration.

  Furthermore, this embodiment may be configured in combination with the first embodiment described above. Specifically, the server device 20 illustrated in FIG. 6 may include the control unit 205 in the first embodiment. In this case, for example, after the control of the driving of the vehicle 1 by the control unit 205 is performed, the driving of the driver can be further evaluated. On the other hand, as a result of evaluating the driver's driving, it is possible to adopt a configuration in which control by the control unit 205 is performed only on the vehicle 1 driven by the driver having a low evaluation value.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. FIG. 8 is a block diagram mainly showing a functional configuration of the server device 20 included in the electronic device system (evaluation value calculation system) according to the present embodiment. Detailed description of the same parts as those in FIG. 6 in the second embodiment described above will be omitted. Here, a different part from FIG. 6 in 2nd Embodiment is mainly described.

  The server device 20 according to the present embodiment has a function of evaluating the traveling of the vehicle 1 with the configuration shown in FIG. Here, the driving of the vehicle 1 and the driving of the driver with respect to the vehicle 1 are evaluated in order to support the business of car insurance for the vehicle 1.

  The evaluation value calculation unit 221 is based on the travel distance based on the position information received by the reception unit 201 and weather information regarding the weather including the position indicated by the position information (by the precipitation state estimation unit 203 and the road surface state estimation unit 204). Based on the estimation result) and the above-described traveling state information, a value for evaluating traveling (hereinafter referred to as an evaluation value) is calculated. In the present embodiment, the traveling state information includes the speed information described above, information indicating acceleration and angular acceleration measured by the acceleration sensor 15 and the gyro sensor 18 provided in the in-vehicle device 10 (hereinafter referred to as acceleration information), and It is assumed to include information indicating the front inter-vehicle distance measured by the inter-vehicle distance sensor 19 (hereinafter referred to as inter-vehicle distance information). The acceleration information included in the traveling state information is information indicating the direction in which the acceleration occurs together with the acceleration acting on the vehicle 1, for example.

  Next, a processing procedure of the server device 20 (including the electronic device system) will be described with reference to the flowchart of FIG.

  First, the processes of blocks B21 to B24 corresponding to the processes of blocks B11 to B14 shown in FIG. 7 are executed.

  Next, the evaluation value calculation unit 221 uses a coefficient for evaluating the risk of traveling (hereinafter referred to as an evaluation coefficient) based on the road surface state estimated in the block B24 and whether the driver's driving is safe driving. A threshold for evaluating whether or not (hereinafter referred to as an evaluation threshold) is set (block B25). Assume that the evaluation coefficient and the evaluation threshold are stored in advance in the evaluation value calculation unit 221 for each road surface state (state A, state AB, state B, etc.) according to the type of the vehicle 1.

  The evaluation coefficient that is stored in advance is set based on an accident rate with respect to a travel distance or a travel time that is totaled for each type of vehicle and each road surface condition described above. Further, the evaluation coefficient for each type of vehicle and for each road surface condition may be set by aggregating traveling state information in the server device 20. As a result, the influence of the road surface condition can be reflected on the travel distance or travel time used as the basis for calculating the automobile insurance premium. For example, for a motorcycle with a lot of travel on a wet road surface (state B), it is possible to obtain the same insurance premium with a shorter travel distance or travel time than those traveling exclusively on a dry road surface (state A).

  In the present embodiment, the evaluation coefficient and the evaluation threshold are set based on the road surface state estimated by the road surface state estimation unit 204. However, the current precipitation state estimated by the precipitation state estimation unit 203 is described. The evaluation coefficient and the evaluation threshold may be set based on the above.

  When the process of block B25 is executed, the following processes after block B26 are executed.

  First, the receiving unit 201 receives travel status information (block B26). The traveling state information includes the speed information indicating the speed of the vehicle 1 described above, the inter-vehicle distance information indicating the front inter-vehicle distance of the vehicle 1, the acceleration information indicating the acceleration and angular acceleration of the vehicle 1, and the like.

  Next, the evaluation value calculation unit 221 determines the travel distance or travel time based on the position information received in the block B21, the road surface state estimated in the block B24, the evaluation coefficient and the evaluation threshold set in the block B25, and the block B26. The above-described evaluation value is calculated based on the received traveling state information (block B27).

  The evaluation value calculation unit 221 calculates, as an evaluation value, a sum of the product of the travel distance or travel time for each road surface condition and the evaluation coefficient. For example, the travel distance is calculated based on the history of the position information, and is accumulated for each road surface state. In calculating the travel distance, acceleration information may be considered. Further, it may be determined whether the vehicle is traveling or not, and the traveling time may be calculated and may be integrated separately for each road surface state. The product of the travel distance or travel time for each road surface condition and the evaluation coefficient is calculated and totaled for a predetermined period.

  Further, the evaluation value calculation unit 221 may calculate the evaluation value by comprehensively considering the results of the first to fifth determination processes similar to the evaluation value calculation unit 211 described above and the travel distance or travel time. Good. For example, the first to fifth determination processes are executed a plurality of times based on a plurality of travel status information received within a predetermined period, so that the processing result is obtained for each of the first to fifth determination processes. May be calculated, and the average value of the product of the travel distance or travel time for each determination process and the calculated value may be used as the evaluation value. Also, the evaluation value may be calculated by changing the weights for the first to fifth determination processes.

  Here, the evaluation value is calculated by executing the first to fifth determination processes. However, for example, at least one of the first to fifth determination processes is executed. The evaluation value may be calculated by In addition to the first to fifth determination processes, another process may be executed. That is, the evaluation value calculation process described here is an example, and the evaluation value may be calculated by another process.

  The evaluation value calculated by the evaluation value calculation unit 221 may be a numerical value, a predetermined rank, or the like, for example.

  The evaluation value calculated in block B27 is stored in the evaluation value storage unit 222 (block B28). The evaluation value stored in the evaluation value storage unit 222 can be notified to the driver, for example. According to this, it is possible to urge a driver with a low evaluation value who is driving without considering the road surface condition or the like to drive safely. In this case, a warning may be output to the driver whose evaluation value is lower than a predetermined value, for example, via the in-vehicle device 10 or the like.

  In addition, when it is set as the structure which accumulate | stores the positional information and driving | running | working condition information received in the receiving part 201 with the information (time information) which shows the time which received the said positional information and driving | running | working condition information, block B22-B25 , B27 and B28 may be executed after the vehicle 1 has finished traveling, for example.

  The evaluation value stored in the evaluation value storage unit 222 can be used for automobile insurance business, and the server device 20 is an electronic device system (insurance calculation system, insurance money calculation) used for automobile insurance business. It can also be implemented as an insurance business support system (system, insurance contract system, etc.).

  FIG. 10 is a block diagram mainly showing a functional configuration of the server device 20 included in the electronic device system (insurance business support system such as an insurance premium calculation system, an insurance money calculation system, and an insurance contract system) according to the present embodiment.

  In the insurance fee calculation system, the risk calculation unit 230 calculates an accident risk corresponding to the evaluation value stored in the evaluation value storage unit 222, and the insurance fee calculation unit 231 calculates the insurance for the automobile insurance contract of the vehicle 1. The insurance rate is calculated by selecting the rate based on the accident risk. Specifically, the evaluation value can be used when calculating the insurance premium so that the insurance premium is relatively high for vehicles and drivers with low evaluation values. In addition, for example, the evaluation value can be used to grasp the driver's driving content (speed, etc.) when an accident occurs. In addition, a driver with a low evaluation value may be notified in advance of an increase in insurance premiums to encourage safe driving.

  In the insurance money calculation system, the insurance money calculation unit 232 performs an exemption evaluation based on dangerous driving or the like according to the evaluation value at the time of the accident stored in the evaluation value storage unit 222, and based on the automobile insurance contract of the vehicle 1 Insurance payments are calculated based on the exemption assessment. Specifically, in the case of a driver with a low evaluation value or a driving accident with a low evaluation value, the insurance money for passenger accident insurance or vehicle insurance paid to the contractor or the insured car is reduced according to the evaluation value. be able to. In addition, a driver with a low evaluation value may be notified in advance of a reduction in accident insurance money to encourage safe driving.

  In the insurance contract system, the insurance premium calculated by the insurance premium calculation unit 231, the insurance conditions calculated by the insurance premium calculation unit 232, and the auto insurance contract terms and conditions that define these calculation methods are An insurance contract that is presented in the contract presenting unit 233 and reflects the evaluation value can be concluded in a new contract, contract renewal, or temporary contract modification.

  As described above, in the present embodiment, the risk of traveling of the vehicle 1 and the driving of the driver are evaluated based on the weather information regarding the weather in the region including the position of the vehicle 1 and the traveling state information of the vehicle 1. An evaluation value is calculated. According to such a configuration, for example, the evaluation coefficient and the evaluation threshold value are set according to the road surface state on which the vehicle 1 estimated based on weather information is traveling, and the driving risk and the driving of the driver are evaluated. It becomes possible. Such an evaluation result (evaluation value) can be used, for example, to support automobile insurance work for the vehicle 1 and can also be used to improve the driving of the driver.

  According to the third embodiment described above, it is possible to support the car insurance business for the vehicle 1 in consideration of the weather at the point where the vehicle 1 travels and the driving of the driver for the vehicle 1. .

  According to at least one embodiment described above, an electronic device system, an electronic device, and a method that can support driving of the vehicle 1 in consideration of the weather at the point where the vehicle 1 is traveling are provided. be able to.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 10 ... In-vehicle apparatus, 11 ... SOC, 12 ... RAM, 13 ... Flash memory, 14 ... Power supply circuit, 15 ... Acceleration sensor, 16 ... GPS module, 17 ... Communication module, 18 ... Gyro sensor, 19 ... Inter-vehicle distance Distance sensor, 20 server device, 21 ... CPU, 22 ... nonvolatile memory, 23 ... main memory, 24 ... BIOS-ROM, 25 ... system controller, 26 ... wireless communication device, 27 ... EC, 30 network, 201 ... receiving unit 202 ... Weather information storage unit, 203 ... Precipitation condition estimation unit, 204 ... Road surface state estimation unit, 205 ... Control unit, 211 ... Evaluation value calculation unit, 212 ... Evaluation value storage unit, 221 ... Evaluation value calculation unit, 222 ... Evaluation value storage unit, 230 ... Risk calculation unit, 231 ... Insurance premium calculation unit, 232 ... Insurance money calculation unit, 233 ... Insurance contract presentation unit.

Claims (9)

  1. An electronic device having an in-vehicle device mounted on a vehicle including a GPS module, and a server device that performs wireless communication with the in-vehicle device,
    The server device
    Receiving means for receiving, from the in-vehicle device, position information indicating the position of the vehicle acquired from the GPS module ;
    A weather information storage unit that is periodically updated and stores weather information regarding the weather in each region, including precipitation at the time of the update and a predicted value of precipitation after a predetermined period;
    With the weather information about the weather including areas the position indicated by the previous SL-position location information acquired from the weather information storage unit, the current from the predicted value and the precipitation contained in the latest weather information of the area Precipitation state estimation means for estimating the precipitation state ;
    The road surface on which the vehicle is traveling based on the past weather information within the predetermined period from the present of the area acquired from the weather information storage unit and the current precipitation situation estimated by the precipitation situation estimation means Road surface state estimating means for estimating the state;
    A plurality of speed threshold values corresponding to various road surface conditions are held, and the speed threshold value corresponding to the road surface condition estimated by the road surface condition estimating unit is transmitted to the in-vehicle device, thereby traveling safely in the road surface condition. An electronic device system comprising: control means for controlling the speed of the vehicle so that the vehicle travels at a speed that is possible .
  2. It said receiving means receives the driving status information indicating the speed of the vehicle transmitted from the vehicle-mounted device,
    The control means outputs an overspeed warning to the in-vehicle device of the vehicle when it is determined that the speed of the vehicle indicated by the traveling state information exceeds a threshold corresponding to the road surface condition. The electronic device system described.
  3. The receiving means receives acceleration information indicating acceleration and angular acceleration of the vehicle transmitted from the in-vehicle device,
    When it is determined that the acceleration and angular acceleration of the vehicle indicated by the acceleration information exceed a threshold corresponding to the road surface state, the control means gives a warning of sudden acceleration or a sudden handle to the in-vehicle device of the vehicle. The electronic device system according to claim 1, wherein the electronic device system is output .
  4. The receiving means receives inter-vehicle distance information indicating a front inter-vehicle distance of the vehicle transmitted from the in-vehicle device,
    When the control means determines that the front inter-vehicle distance of the vehicle indicated by the inter-vehicle distance information is less than a threshold value corresponding to the road surface condition, the control means outputs a warning of insufficient inter-vehicle distance to the in-vehicle device of the vehicle. Item 2. The electronic device system according to Item 1 .
  5. The receiving means further receives temperature information indicating a current temperature in a region including the position indicated by the acquired position information,
    The road surface condition estimation unit, an electronic apparatus system according to claim 1, wherein said vehicle is to estimate the state of the road surface on which the vehicle runs based on the received temperature information.
  6. The receiving unit may receive the traffic information about the traffic amount estimated or measured at the location indicated by the location information to the received from the external server device,
    The road surface condition estimation unit, an electronic apparatus system according to claim 1, wherein said vehicle is to estimate the state of the road surface on which the vehicle runs based on the received traffic information.
  7. The electronic device system according to any one of claims 2 to 4 , wherein the threshold value varies depending on a type of the vehicle.
  8. An electronic device composed of a server device that performs wireless communication with an in-vehicle device mounted on a vehicle including a GPS module,
    Receiving means for receiving, from the in-vehicle device, position information indicating the position of the vehicle acquired from the GPS module ;
    A weather information storage unit that is periodically updated and stores weather information regarding the weather in each region, including precipitation at the time of the update and a predicted value of precipitation after a predetermined period;
    With the weather information about the weather including areas the position indicated by the previous SL-position location information acquired from the weather information storage unit, the current from the predicted value and the precipitation contained in the latest weather information of the area Precipitation state estimation means for estimating the precipitation state ;
    The road surface on which the vehicle is traveling based on the past weather information within the predetermined period from the present of the area acquired from the weather information storage unit and the current precipitation situation estimated by the precipitation situation estimation means Road surface state estimating means for estimating the state;
    A plurality of speed threshold values corresponding to various road surface conditions are held, and the speed threshold value corresponding to the road surface condition estimated by the road surface condition estimating unit is transmitted to the in-vehicle device, thereby traveling safely in the road surface condition. Control means for controlling the speed of the vehicle so as to travel below a possible speed ;
    An electronic device comprising:
  9. A method of an electronic device including a server device that performs wireless communication with an in-vehicle device mounted on a vehicle including a GPS module,
    Receiving position information indicating the position of the vehicle acquired from the GPS module from the in- vehicle device ;
    Storing weather information related to the weather in each region, which is regularly updated and includes the precipitation at the time of the update and the predicted value of precipitation after a predetermined period of time, in the weather information storage unit;
    With the weather information about the weather including areas the position indicated by the previous SL-position location information acquired from the weather information storage unit, the current from the predicted value and the precipitation contained in the latest weather information of the area Estimating the precipitation situation ;
    Estimating the road surface state on which the vehicle is traveling based on the past weather information and the estimated current precipitation status within a predetermined period from the present of the area acquired from the weather information storage unit When,
    A speed at which a plurality of speed threshold values corresponding to various road surface conditions are held, and the speed threshold value corresponding to the estimated road surface condition is transmitted to the in-vehicle device, so that the vehicle can safely travel in the road surface condition. Controlling the speed of the vehicle to travel below .
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