JP3159103B2 - Road-to-vehicle communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road-vehicle communication system, and more particularly to a system for transmitting and receiving relatively large amounts of information such as map data.

[0002]

2. Description of the Related Art Hitherto, a system has been proposed in which a roadside beacon is installed in a garage, a gas station, a drive-in, or the like of a general household to transmit and receive information to and from a vehicle-mounted device.

For example, Japanese Unexamined Patent Publication No. 7-79183 discloses that a roadside beacon transmitting at an extremely low transmission output is installed in a garage or the like of a general household, and simple travel time information indicating the time required to reach a destination is transmitted to a vehicle. The technique of supplying to the side is disclosed.

[0004]

However, when information is transmitted from the roadside beacon to the vehicle-mounted device, a large amount of information may affect the battery of the vehicle. For example,
It is necessary to always update and prepare the latest map data used in the in-vehicle navigation device, and when transmitting the latest map data from a home personal computer to an in-vehicle device via a roadside beacon, several tens to You need to send hundreds of megabytes of data. At this time, depending on the transmission capacity, transmission may take tens of minutes (or several hours), and during that time, the vehicle-mounted battery may be deteriorated because the vehicle-mounted device is continuously driven. Of course, it is conceivable to always monitor the terminal voltage of the vehicle-mounted battery and start the engine and supply power when the terminal voltage falls below the allowable voltage. However, starting the engine during transmission may cause interruption of communication, which is not preferable. . In addition, if it is a general household, it is possible to convert a household power supply into a power supply for in-vehicle equipment instead of an in-vehicle battery, but it is very troublesome to connect using a cable or the like every time information is transmitted. There are also problems. The above problem occurs not only when information is transmitted from the roadside beacon to the vehicle-mounted device, but also when information is transmitted from the vehicle-mounted device to the roadside beacon.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reliably transmit and receive information between a roadside information processing apparatus and an onboard information processing apparatus while suppressing the influence on an onboard battery. It is to provide a system that can do it.

[0006]

In order to achieve the above object, the present invention relates to a roadside-vehicle communication system for transmitting and receiving information between a roadside information processing device and a vehicle-mounted information processing device. Calculating means for estimating the transmission time of the information and the terminal voltage of the in-vehicle battery after the end of the transmission, and, when the estimated terminal voltage is smaller than a predetermined value, a notifying means for notifying the information prior to the transmission of the information, The on-vehicle information processing device has a transmission unit that transmits the actual inter-terminal voltage of the on-vehicle battery before the information transmission to the road-side information processing device, wherein the road-side information processing device has the actual inter-terminal voltage and the transmission time. The terminal voltage of the vehicle-mounted battery after the end of the transmission is estimated based on

Here, the roadside information processing apparatus, when notified by the notifying means, transmits a drive signal for starting an engine of a vehicle on which the onboard information processing apparatus is mounted before transmitting the information. It is preferable to further include a control unit for transmitting the information to the device.

Further, the on-vehicle information processing device has an information storage device for storing the information transmitted from the road-side information processing device, and the control means controls the inside of the on-vehicle information processing device prior to starting the engine. It is preferable to set the information storage device in the non-drive state.

In the present invention, it is preferable that the roadside information processing device estimates the transmission time based on a transmission condition between the roadside information processing device and the on-vehicle information processing device.

[0010] The roadside information processing apparatus further includes a dummy data transmitting / receiving means for transmitting and receiving dummy data of a known capacity between the on-vehicle information processing apparatuses before transmitting the information.
The transmission condition can be determined based on the transmission and reception of the dummy data.

[0011]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the following, according to an embodiment of the present invention based on the drawings, a case where a roadside beacon is installed in a garage of a general home and information is transmitted and received between a home information processing apparatus and a vehicle-mounted information processing apparatus Will be described as an example.

<First Embodiment> FIG. 1 is a conceptual diagram of a system according to the first embodiment. The garage 100 is provided with a roadside beacon 102, and the vehicle 10 is provided with a beacon 102.
A transmitter / receiver 12 for transmitting and receiving the information of the above is provided. The information transmission form may be any of radio waves, light, infrared rays, and the like.
The transceiver 12 includes an ECU including a microcomputer.
(Electronic control device) 14 is connected, processes received information, and transmits information to the roadside beacon 102. On the other hand, a home computer 104 is connected to the roadside beacon 102 of the garage 100, selects information to be transmitted, transmits the information to the roadside beacon 102, and executes various processes prior to transmission. The processing prior to this transmission will be described later. Various home devices are connected to the home computer 104 and can be controlled from the home computer 104. For example, as shown in the drawing, an indoor display 108, a stationary bike 110, and a fan 112 in a garage are controlled via a home automation 106. Operation can be controlled. The display 108 and the exercise bike 110 are driven based on information transmitted from the vehicle 10 to the roadside beacon 102. For example, the home computer 104 captures images taken while the vehicle 10 is traveling, and the traveling of the exercise bike 110. The image is displayed on the display 108 according to the situation. Also,
The fan 112 is driven to exhaust the exhaust gas from the vehicle 10 when the engine of the vehicle 10 needs to be started.

FIG. 2 is a block diagram showing the main components of the present embodiment. Information selected by the user on the home computer 104 is transmitted from the beacon 102 to the transceiver 12 of the vehicle 10 and supplied to the ECU 14. Information transmitted from the home computer 104 includes, for example, updated map data for an in-vehicle navigation system, a travel plan created on the home computer 104 (a route to a destination, etc.), and various information acquired by the home computer 104 via a network. (News, weather forecast, tourist information). The information transmitted from the vehicle to the home computer 104 includes the in-vehicle C as described above.
There are running images (moving images and still images to which shooting time and shooting position information are added) shot by a CD camera (not shown) or the like. The ECU 14 stores the received information in the memory 1
6 and displayed on the in-vehicle display 18 as necessary. The memory 16 is composed of, for example, a hard disk or a DVD, and the in-vehicle display 18 is composed of, for example, a liquid crystal panel. When a drive signal for starting the engine is transmitted from the home computer 104, the ECU 14 outputs a drive command to the starter 20 to start the engine. When the drive signal for starting the engine is transmitted from the home computer 104, the garage 100 is transmitted via the home automation 106 as described above.
Is driven.

As described above, in the present embodiment, information can be transmitted from the home computer 104 to the vehicle 10 and, conversely, information can be transmitted from the vehicle 10 to the home computer 104. When transmitting (tens to hundreds of megabytes) of updated map data and storing it in the vehicle-mounted memory 16, the vehicle-mounted battery may be deteriorated due to a long transmission time.
Therefore, in the present embodiment, when information is transmitted from the home computer 104 to the vehicle 10, the transmission time is estimated by the home computer 104 and the terminal voltage of the in-vehicle battery after transmission is estimated. If the voltage is equal to or lower than the predetermined allowable voltage, the fact is notified.
Before transmitting the information, the drive signal is transmitted to the ECU 14 in advance.
To start the engine so that information can be transmitted reliably while preventing deterioration of the on-vehicle battery.

FIGS. 3 and 4 show a processing flowchart of this embodiment. FIG. 3 is a processing flowchart of the home computer 104, and FIG.
It is a processing flowchart of. First, in FIG. 3, the user starts the home computer 104 to start application software (link software) for communicating with the vehicle 10 (S101). When the application is started, the application starts the roadside beacon 102
The ID and the activation ID are transmitted to the vehicle 10 via (S10)
2). When the reception preparation on the side of the vehicle 10 is completed by ID transmission, the link software of the home computer 104 reads / writes dummy data of a known capacity (for example, 1 kilobyte) prior to transmission of information to be transmitted (S1).
03). Specifically, while transmitting the dummy file from the home computer 104 to the ECU 14,
14 transmits the dummy data to the home computer 104. Then, by transmitting and receiving the dummy data, the home computer 104 calculates an effective communication capacity as a transmission condition (S104). That is, the communication speed is detected based on how many minutes it takes to transmit and receive all the dummy data of the known capacity. This effective communication capacity is referred to as Cv for convenience. After calculating the effective communication capacity, the link software of the home computer 104 displays a message "Linked to the car" on the screen (S105), and shifts to a screen for specifying a file to be transmitted to the user. When the user specifies a file to be transmitted (S106), the transmission time (or write time) TR required to transmit the specified file is estimated based on the information amount Vi of the specified file and the communication capacity Cv calculated in S104. Yes (S10
7). In particular,

## EQU1 ## It is sufficient to estimate TR = Vi / Cv. After estimating the transmission time of the specified file, it is determined whether or not the memory 16 of the vehicle 10 has enough capacity to store this file (S108). This determination is made based on the free memory information from the ECU 14. If there is no free memory, the link software displays a message "Memory is insufficient, please edit" on the screen and perform processing such as compression. Prompt (S112). On the other hand, if there is sufficient free space to store the specified file, the link software of the home computer 104 determines that the terminal voltage of the vehicle-mounted battery after the estimated transmission time TR is equal to or higher than the voltage (starting voltage) necessary for starting the engine. Is determined (S109). This determination is specifically performed as follows. That is, the total power consumption required for transmitting the designated file is calculated from the transmission time TR and the power consumption rate when the in-vehicle device is driven. Next, based on the current-voltage characteristics of the in-vehicle battery known in advance, the terminal voltage when the power consumption is consumed from the current terminal voltage of the in-vehicle battery is estimated. Then, the terminal voltage (estimated terminal voltage) VB obtained by the estimation is compared with the starting voltage V0,

## EQU2 ## It is determined whether or not VB≥V0. When the above expression is satisfied, that is, when the estimated terminal voltage is equal to or higher than the starting voltage, there is no problem even if the transmission is performed.
Write to the file). Specifically, the link software transmits the designated file to the roadside beacon 102, transmits the file from the roadside beacon to the transceiver 12 of the vehicle 10, and stores the file in the memory 16 via the ECU 14 from the transceiver 12 (S110). Then, the vehicle power supply is turned off (S111). On the other hand, if the above expression is not satisfied, that is, if the estimated terminal voltage is smaller than the starting voltage, even if the transmission is performed as it is, deterioration of the vehicle-mounted battery is caused, so that the user is notified and the file is transmitted. Before that, the ON code (drive signal) of the starter is transmitted to the vehicle 10 (S113). As a method of notifying the user, a message to that effect may be displayed on the screen of the home computer 104, for example. Then, after the engine is started and the in-vehicle voltage is confirmed (S114), the designated file is transmitted (written) (S110). When the transmission of the designated file is completed, an OFF signal of the vehicle power supply is transmitted (S111). When the starter ON signal is transmitted, the engine OFF signal is transmitted at the same time in S111.

FIG. 4 shows a process of the ECU 14, in which it is first determined whether or not an activation ID has been received (S201). The activation ID is transmitted from the home computer 104 (see S102). When the activation ID is received, the power supply and the memory 16 necessary for communication in the ECU 14 are transmitted.
Is turned on (S202). The transceiver 12
Is always receiving power supply from the vehicle-mounted battery, and is in a state where it can always receive information from the roadside beacon 102 regardless of the state of the vehicle 10. When the reception preparation is completed, the current terminal voltage (+ B) of the vehicle-mounted battery and the memory 1
6 and the version information of the link software, if necessary, to the home computer 104 (S
203). The terminal voltage information of the vehicle-mounted battery and the free space information of the memory 16 are stored in the home computer 1 as described above.
This is information necessary for the determination processing of S107 and S108 on the 04 side. The version information defines a standard for transmitting information from the home computer 104. Then, the ECU 14 shifts to a state of waiting for a starter ON signal from the home computer 104 (S204). If it is determined that the estimated terminal voltage after file transmission is lower than the starting voltage, the home computer 104 transmits a starter ON signal (see S113).
The CU 14 protects the memory 16 (S20
5) The starter 20 is driven (S206). The reason that the memory 16 is protected before the starter 20 is turned on is to prevent a memory reset due to a decrease in terminal voltage due to the start of the engine. That is, the starter 20
When the terminal voltage of the vehicle-mounted battery temporarily drops below 2 to 3 V due to the large current consumed when the power supply is turned on, the drive state of the memory such as a hard disk cannot be maintained and the memory is reset. Since resetting may cause file destruction, the memory 16 is protected (driving stopped) in advance to prevent this. Therefore, even if the system is reset after driving the starter 20 to start the engine (S20)
7) The file is transferred to the state of waiting for reception of a file from the home computer 104 and writing of the transmitted file can be smoothly performed without damaging the memory 16 (S).
208). When the transmission of all the selected files is completed, the in-vehicle power supply OFF signal is transmitted from the home computer 104 (see S111). When this signal is received (S209), the system is turned off to return to the initial state (S210). . When an engine OFF signal is also transmitted, the engine is stopped in response to the signal. If the starter ON signal is not transmitted from the home computer 104 (NO in S204), after the transmission (memory 1
6 indicates that the estimated terminal voltage is sufficiently high (after writing the file to the memory 6), and immediately shifts to the reception waiting state without driving the starter 20. When the file is transmitted, the file is written to the memory 16.

FIG. 5 schematically shows a screen display on the home computer 104 when the above-described processing is executed. (A) is an initial screen, in which a link software icon 120 is displayed in the right corner of the screen (vehicle shape). When the icon 120 is clicked (or double-clicked), the link software is activated, and the link software 122 is displayed on the screen as shown in FIG. When the link software is activated, as described above, transmission / reception of dummy data with a known capacity is executed (see S103) to detect the effective communication capacity. The detected effective communication capacity is link software 1
22 is displayed as a message 124. For example, "Linked to a car. The current communication environment is 0.9Mbps.
Yes. " After displaying the message, the link software displays a file list screen 126 and a vehicle file screen 128 stored in the memory (hard disk or the like) of the home computer 104 as shown in FIG. The vehicle-side file screen 128 displays the vehicle icon 12
9 and an icon 130 indicating the state of the vehicle-mounted battery are displayed. The display of the state of the vehicle-mounted battery is performed based on the terminal voltage (+ B) transmitted from the ECU 14.
Then, the user wants to send the file list screen 126
And dragging the file to the vehicle file screen 128, the file to be transmitted is selected. When a file is selected, the home computer 104 detects the capacity of the file and calculates an estimated terminal voltage at the end of transmission. If the estimated terminal voltage is smaller than the starting voltage, as shown in FIG. 3D, "Do you want to start engine E / G? Y / N?"
Is displayed. This message takes into account that some users do not like to start the engine, and of course, instead of this message, it is assumed that the engine should be started. ". In any case, the user is notified that the estimated terminal voltage is lower than the starting voltage. If the user selects YES on the screen (D), the home computer 104 sends a starter ON signal to the ECU 1.
4 and write is performed (S110). During writing, the link software displays a screen 134 indicating the progress of writing. As described above, in the present embodiment, when a file to be transmitted is selected, an estimated terminal voltage at the end of transmission is calculated from the capacity of the file, the effective communication capacity, and the terminal voltage, and if the estimated terminal voltage is smaller than a predetermined value. When the determination is made, the engine is started in advance, so that it is possible to reliably prevent the voltage of the in-vehicle battery from dropping during the file transmission, forcing the engine to start, and thereby reducing the efficiency of the file transmission.

In this embodiment, the case where a file is transmitted from the home computer 104 to the ECU 14 has been described.
The same is possible when transmitting information to the 04 side. In this case, if a file to be transmitted is selected on the vehicle side, the terminal voltage (+ B) and the capacity data of the file are transmitted to the home computer 104, and if it is determined that the estimated terminal voltage becomes lower than the starting voltage, the engine is started. Good. Of course, it is also possible to calculate the estimated terminal voltage on the ECU 14 side.

<Second Embodiment> In the above embodiment,
When the estimated terminal voltage is equal to or higher than the starting voltage value, the file transmission is executed as it is. However, the communication environment may be deteriorated for some reason during the transmission. Therefore, in the present embodiment, a case will be described in which it is monitored whether or not the voltage drop of the vehicle-mounted battery is as expected even after the transmission is started.

The configuration of the present embodiment is the same as that of FIGS. 1 and 2. FIG. 6 shows a processing flowchart of the home computer 104, and FIG. 7 shows a processing flowchart of the ECU 14. In FIG. 6, first, the user starts the home computer 104 to start application software (link software) for communicating with the vehicle 10 (S).
301). When the application is activated, the application transmits the ID and the activation I via the roadside beacon 102.
D is transmitted to the vehicle 10 (S302). When the preparation for reception on the side of the vehicle 10 is completed by ID transmission, the link software of the home computer 104 reads / writes dummy data of a known capacity (for example, 1 kilobyte) prior to transmission of information to be transmitted (S303). Then, by transmitting and receiving the dummy data, the home computer 10
4 calculates an effective communication capacity as a transmission condition (S30).
4). This effective communication capacity is referred to as Cv for convenience. After calculating the effective communication capacity, the link software of the home computer 104 displays a message "Linked to the car" on the screen (S305), and shifts to a screen for specifying a file to be transmitted to the user. When the user specifies a file to be transmitted (S306), the transmission time (or write time) TR required to transmit the specified file is estimated based on the information amount Vi of the specified file and the communication capacity Cv calculated in S304. (S307). After estimating the transmission time of the specified file, it is determined whether or not the memory 16 of the vehicle 10 has enough capacity to store this file (S308). This determination is made by the ECU 14
If there is no free memory, the link software displays a message "memory is insufficient, please edit" on the screen to urge processing such as compression (S309). On the other hand, if there is enough free space to store the designated file, the link software of the home computer 104 determines the estimated transmission time T
It is determined whether or not the terminal voltage of the on-board battery after R is equal to or higher than a voltage (starting voltage) necessary for starting the engine (S31).
0). This determination is specifically performed as follows.
That is, the total power consumption required for transmitting the designated file is calculated from the transmission time TR and the power consumption rate when the in-vehicle device is driven. Next, a terminal voltage is estimated based on a known current-voltage characteristic of the vehicle-mounted battery when the terminal voltage of the current vehicle-mounted battery is consumed by the power consumption. Then, the terminal voltage (estimated terminal voltage) VB obtained by the estimation is compared with the starting voltage V0. If the estimated terminal voltage is equal to or higher than the starting voltage, the transmission of the specified file is performed (writing to the memory 16) because there is no problem even if the transmission is performed (S313). Specifically, the link software transmits the designated file to the roadside beacon 102, transmits the file from the roadside beacon to the transceiver 12 of the vehicle 10, and
2 is stored in the memory 16 via the ECU 14. On the other hand, if the estimated terminal voltage is smaller than the starting voltage, even if the transmission is performed as it is, the on-board battery is deteriorated.
Before transmitting the file, the ON code (drive signal) of the starter is transmitted to the vehicle 10 (S311). Then, after the engine is started and the vehicle voltage is confirmed (S312),
Execute transmission (writing) of the specified file (S31)
3). However, this transmission (writing) is performed in units of a certain fixed amount.

After writing a predetermined amount, the home computer 104 determines whether or not the terminal voltage of the on-vehicle battery falls within a predetermined value (S314). This judgment is
Specifically, this is performed by comparing the estimated terminal voltage at the end of the transmission of a certain amount of the file with the terminal voltage of the vehicle-mounted battery actually transmitted from the vehicle side. If the terminal voltage after file transmission is lower than the estimated terminal voltage for some reason (for example, a temporary decrease in the communication capacity), the communication capacity, the transmission time, and the consumption time of the remaining untransmitted files are reduced. The power is re-counted (S315), and based on these, the estimated terminal voltage is calculated again and compared with the starting voltage (S310). If it is determined that the newly calculated estimated terminal voltage is smaller than the starting voltage, a starter ON signal is transmitted (S311) to start the engine.
In this case, the transmission process of the file is temporarily interrupted, but it is possible to reliably prevent the in-vehicle battery from being deteriorated at the end of the transmission contrary to the prediction. On the other hand, when it is confirmed by the voltage monitoring (S314) after the writing that the voltage drop of the vehicle-mounted battery is within the predetermined value, it is determined whether or not there is an untransmitted remaining amount file (step S314). S316). If there is a remaining file, the process returns to S313 to continue writing, and if all files have been transmitted, a writing completion message is displayed (S317). Then, a dialog screen is displayed to the user as to whether or not to continue writing the file (S318).
Returning to the file designation screen of 306, if not continued, the power OFF signal (and the engine OFF signal if the starter ON signal is transmitted) is transmitted to the vehicle (S3).
19).

FIG. 7 shows the processing of the ECU 14. When the activation ID code transmitted from the home computer 104 is received (S401), the power of the part necessary for communication in the ECU 14 and the power of the memory 16 are turned on. (S4
02). Note that the transceiver 12 is always receiving power supply from the vehicle-mounted battery, and is in a state where it can always receive information from the roadside beacon 102 regardless of the state of the vehicle 10.
When the preparation for reception is completed, the current terminal voltage (+ B) of the vehicle battery, the free space of the memory 16 and, if necessary, the version information of the link software are transmitted to the home computer 104 (S403). And ECU
14 shifts to a state of waiting for a starter ON signal from the home computer 104 (S404). If it is determined that the estimated terminal voltage after the file transmission is smaller than the starting voltage, the home computer 104 transmits a starter ON signal. In this case, the ECU 14 protects the memory 16 (S405) and resets the starter 20. It is driven (S406). Therefore, the terminal voltage of the vehicle-mounted battery is 2 V
Even if the system reset is applied after dropping to ~ 3V (S4
07), the files in the memory 16 are not damaged.

Thereafter, the ECU 14 enters a standby state. When a file is transmitted from the home computer 104, the file is written into the memory 16 (S408). After the writing of the file is completed, the terminal voltage of the vehicle-mounted battery at the time when the writing of the file is completed is detected and transmitted to the home computer 104 (S409). This is for comparing the estimated terminal voltage with the actual terminal voltage as described above, evaluating whether or not the calculation of the estimated terminal voltage is accurate, and improving the estimated terminal voltage accuracy in the subsequent file transmission. . And home computer 1
The process waits until a code indicating that writing of all files has been completed is transmitted from 04 (S410). When the completion code is received, the power supply in the ECU 14 and the power supply of the memory circuit which are turned on in S402 are turned off, and when the engine is started, the engine is turned off at the same time (S411). Then, the process shifts to the power saving standby mode, which is the initial state, that is, the mode in which power is supplied to only a minimum portion of the transceiver 12 and the ECU 14 (S412).

FIG. 8 schematically shows a screen display example on the home computer 104 side in the above-described processing.
(A) is an initial screen, in which a link software icon 200 is displayed in the right corner of the screen. When this icon is double-clicked, link software is activated, and a link software screen 202 is displayed as shown in FIG. The screen 202 includes a menu selection screen and an ID input screen. The menu includes a “light (WRI)” selected when the home computer 104 transmits a file to the vehicle.
TE) ”and“ READ ”selected when transmitting a file from the vehicle to the home computer 104. When the menu is selected and the ID is transmitted, the link software executes transmission and reception of dummy data to detect the effective communication capacity. After the detection, the screen 204 on the vehicle side is displayed in parallel with the screen 203 on the home computer 104 side as shown in FIG. At this time, as in the first embodiment, the message "Linked to the car. The current communication capacity is ** bps" is displayed. When the user selects a file (for example, updated map data) stored in the memory of the home computer 104 on this screen and drags the file to the screen on the vehicle side, the home computer 104 obtains the capacity, communication capacity, and power consumption of the file. The time required for transmission (writing) is calculated from the rate, and the estimated terminal voltage at the end of transmission is calculated and compared with the starting voltage. As a result of the comparison, if the estimated terminal voltage becomes smaller than the starting voltage, a message 206 of “writing takes time. Engine needs to be started” is displayed as shown in (D), and then (E )
Is displayed, a message 208 "Do you want to start the engine?" Is displayed. Here, if the user is "NO"
Is selected, the screen returns to the screen of (C) again and prompts the user to select another file. If "YES" is selected, a starter ON signal is transmitted to the vehicle to start the engine, and then transmission of a file is started. During file transmission, (F)
The screen 210 of "Writing" is displayed as shown in FIG.
Of course, a bar indicating the writing status may be displayed. When the writing is completed, a completion message 212 "Completed." Is displayed as shown in FIG.
As shown in (H), a message 214 "Do you want to send another file?" Is displayed to prompt the user to select another file. If there is no other file to be transmitted, the user selects "NO", and in this case, the home computer 104 transmits a power OFF signal to the vehicle and transmits a starter ON signal to start the engine. If so, it also sends an engine off signal,
As shown in (I), a message 216 "Engine turned off" is displayed.

As described above, in this embodiment, the transmission of the files is not performed collectively, but after transmitting a certain amount of files, the estimated terminal voltage is compared with the actual terminal voltage to improve the accuracy of the estimation calculation. Evaluation, if it is determined that the estimated terminal voltage is not accurate, the communication capacity etc. is re-detected and the estimated terminal voltage is calculated again, so that it is possible to reliably prevent the deterioration of the onboard battery during transmission and improve the transmission efficiency. Can be.

[0027]

As described above, according to the present invention,
When information is transmitted and received between the roadside information processing device and the in-vehicle information processing device, deterioration of the in-vehicle battery can be suppressed and communication efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a system according to a first embodiment.

FIG. 2 is a block diagram showing a main configuration of the embodiment.

FIG. 3 is a processing flowchart of the home computer of the embodiment.

FIG. 4 is a processing flowchart on the vehicle side (ECU) of the embodiment.

FIG. 5 is an explanatory diagram showing a screen display example of the embodiment.

FIG. 6 is a processing flowchart of a home computer according to the second embodiment.

FIG. 7 is a processing flowchart of a vehicle (ECU) of the embodiment.

FIG. 8 is an explanatory diagram showing a screen display example of the embodiment.

[Explanation of symbols]

10 vehicle, 12 transceiver, 14 ECU, 16 memory, 18 display (vehicle), 20 starter,
100 garage, 102 roadside beacon, 104 home computer, 106 home automation, 108
Display (home side), 110 exercise bike,
112 fans.

Continuation of the front page (51) Int.Cl. ⁷ identification symbol FI H04B 5/02 G06F 1/00 333D (58) Investigated field (Int.Cl. ⁷ , DB name) G08G 1/09 B60R 16/02 670 G01S 1/68 G06F 1/28 H02J 7/00 H04B 5/02

Claims (5)

(57) [Claims] 1. A road-to-vehicle communication system for transmitting and receiving information between a roadside information processing device and an on-vehicle information processing device, wherein a time for transmitting information from one side to the other and a terminal voltage of the on-vehicle battery after transmission are estimated. And a notifying unit for notifying, prior to the transmission of the information, that the estimated terminal voltage is smaller than the predetermined value, the in-vehicle information processing apparatus includes: The roadside information processing device estimates a terminal voltage of the vehicle-mounted battery after the transmission based on the actual terminal-to-terminal voltage and the transmission time. A road-to-vehicle communication system, characterized in that: 2. The in-vehicle information processing device according to claim 1, wherein the road-side information processing device, when informed by the informing unit, transmits a drive signal for starting an engine of a vehicle equipped with the in-vehicle information processing device before transmitting the information. 2. The road-to-vehicle communication system according to claim 1, further comprising control means for transmitting the data to the communication device. 3. The on-vehicle information processing device includes an information storage device for storing the information transmitted from the roadside information processing device, and the control unit controls the on-vehicle information processing device prior to starting the engine. The road-vehicle communication system according to claim 2, wherein the information storage device is set to a non-drive state. 4. The road-to-vehicle communication device according to claim 1, wherein the roadside information processing device estimates the transmission time based on a transmission condition between the roadside information processing device and the on-vehicle information processing device. Communications system. 5. The roadside information processing apparatus further comprises: dummy data transmitting / receiving means for transmitting / receiving dummy data having a known capacity between the on-vehicle information processing apparatuses before transmitting the information, based on the transmission / reception of the dummy data. The road-vehicle communication system according to claim 4, wherein the transmission condition is determined.