KR20090063575A

KR20090063575A - Method for transferringcar information through controller area network

Info

Publication number: KR20090063575A
Application number: KR1020070131001A
Authority: KR
Inventors: 연규혁
Original assignee: 현대자동차주식회사
Priority date: 2007-12-14
Filing date: 2007-12-14
Publication date: 2009-06-18

Abstract

A vehicles information transmission method for confirming an instrument in which network is not operated by using CAN is provided to notify a problem discovered through CAN/telematics apparatus. A telematics unit(110) receives a CAN(Controller Area Network) message from devices. A telematics unit senses the network identification of the device connected through CAN by monitoring controller area network bus. One or more functions abnormally operate among the functions which the device performs. A center message including abnormal operation information and device information is generated by analyzing the CAN message. The center message is transmitted to a center(200) through a CDMA modem.

Description

Method for transferring car information through controller area network

The present invention relates to a vehicle network, and more particularly, to a method of transmitting vehicle information such as notification of an abnormality of a multimedia device through a controller area network (CAN), upgrade, and the like.

Recently, various electronic systems have been combined in automobiles. Electronic boot release, electric mirror adjuster, rain detection, sunroof, weather control, power window, seat adjuster, power train, stability control (ABS, traction control, active suspension), engine management, shifting Such real-time control applications, multimedia devices such as the Internet, digital TV, and the like are used in vehicles.

The wiring commonly used to connect these together requires an incredible amount of cables, which are a significant part of the overall vehicle weight and manufacturing costs. Thus, all of these systems are instantly connected to a common network bus, one or two wires running around the vehicle, in the same way as connecting office desktop PCs together. This reduces the overall manufacturing cost of the vehicle. Such a network is called a controller area network (CAN).

When a multimedia device connected to such a network is broken, there is a problem in which it is not known what the problem is until the corresponding operation of the corresponding device is executed, and only when the corresponding operation is executed. And if there is a network error, you can check the devices that have a problem to go to the repair shop, even if the software upgrade of each device was made in the corresponding shop or had a problem only possible by replacing the unit.

Therefore, the present invention detects whether the functions of the devices provided in the vehicle can be performed properly, and if an abnormality is found vehicle information transmission method that can solve the problem by notifying the center of the problem found through the CAN and telematics devices To provide.

In addition, the present invention can identify a device that does not operate the network by using a CAN, and provides a vehicle information transmission method capable of automatic upgrade through the center by comparing the software version of each device.

According to an aspect of the present invention, a method for transmitting vehicle information to a wirelessly connected center between a device provided in a vehicle and a telematics unit connected through a controller area network (CAN), wherein the telematics unit receives a CAN message from the device Wherein the CAN message is generated when at least one function is abnormally operated as a result of determining whether the function performed by the device is normally operated; A method of transmitting vehicle information through a CAN is provided that includes analyzing a CAN message to generate a center message including the device information and the abnormal operation information and transmitting the center message to a center.

Here, the CAN message may be generated by periodically checking whether the device operates normally.

The center message may be wirelessly transmitted to the center via a CDMA modem.

According to another aspect of the present invention, a method for transmitting vehicle information to a wirelessly connected center of a telematics unit connected to a device provided in a vehicle via a CAN, wherein the telematics unit monitors a CAN bus to monitor a plurality of CAN buses. Detecting a network ID of the device; requesting a network message transmission to a device that is not detected for a preset time; determining that a network error is detected if the network ID of the device is not detected after the network message transmission request; and Provided is a vehicle information transmission method through a CAN including transmitting information of a device determined to be a network error to the center.

Here, the CAN bus may form a ring by the telematics unit sending a message to the device and receiving a request for it.

According to another aspect of the present invention, a method for transmitting vehicle information to a center in which a telematics unit connected to a device provided in a vehicle via a CAN is wirelessly connected, wherein the telematics unit transmits software version information from the device through the CAN. And receiving the software version information to the center, wherein the device transmits the software version information of the device when the vehicle is started. Is provided.

Receiving software upgrade data from the center, wherein the software upgrade data is transmitted when the center needs to upgrade software running on the device from the software version information; The method may further include transmitting the software upgrade data to the device through the CAN.

The transmitting of the software upgrade data through the CAN may include: transmitting, by the telematics unit, a software upgrade request to the device; receiving a response to the software upgrade request; transmitting the total size of the software upgrade data. Dividing the software upgrade data and sequentially transmitting the divided data. The size of the divided data may be equal to or smaller than the size of data that the CAN can transmit at one time.

The vehicle information transmission method according to the present invention can solve the problem by detecting whether the functions of the devices provided in the vehicle can be performed properly and if the abnormality is found by notifying the center the problem found through the CAN and telematics devices have.

In addition, CAN can be used to identify devices that are not operating on the network, and can be automatically upgraded through the center by comparing software versions of each device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a connection structure according to a CAN communication method of devices included in a vehicle according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a vehicle information transmission method according to an embodiment of the present invention.

1 and 2, vehicle 100, telematics unit 110, device A 120a, device B 120b, device C 120c, device D 120d, device E 120e, CAN, center 200 is shown.

In the vehicle 100, devices (device A 120a, device B 120b, device C 120c, device D 120d, device E 120e, etc.) that perform various operations, and a telematics unit ( 110 is connected to the network by the CAN communication method. Each device receives an input from the outside or detects an external state and performs a predetermined operation as necessary. Although there are five devices shown in FIG. 1, the number of devices that may be provided in the vehicle 100 may vary. For convenience of understanding and explanation of the present invention, the device A (120a) of the device will be described mainly, of course, the same can be applied to other devices. Here, the devices include multimedia devices such as an audio device, a DMB device, and a navigation device provided in the vehicle 100.

The device A 120a receives an input of A`1 or A2 and performs an operation called A3. For example, device A 120a may be an audio device, where A1 is a selection input of one of a radio, a CD player, or an MP3 player, A2 is a channel selection input of a radio, a song selection input of a CD player or an MP3 player, and A3. The operation may be an operation of displaying, on the display of the audio device, information on a radio channel or currently selected song.

Each device is connected via CAN, and each network connection is shown as Na, Nb, Nc, Nd, Ne, Nf. CAN in the present invention means a vehicle network system that provides digital serial communication, and will be omitted as will be apparent to those skilled in the art.

Here, A2 and A3 of the functions of the device A 120a operate normally, but when A1 is abnormal (function abnormal), it is necessary to notify the center outside the vehicle 100. The telematics unit 110 notifies the center 200 of the information regarding the abnormally operating device.

In addition, the function of the device D (120d) is operating normally, but the network connection Nd to the CAN is abnormal. In this case, it is also necessary to notify the center outside the vehicle 100. The telematics unit 110 notifies the center 200 of information about a network abnormality in this way.

In addition, when the vehicle 100 starts, each device transmits information about its software version to the telematics unit 110 through CAN. The telematics unit 110 transmits the software version information of each of the received devices to the center 200.

The center 200 determines whether there is an abnormality of the corresponding device provided in the vehicle 100 through software version information, abnormal operation information, network abnormality information, etc. of each device transmitted from the vehicle 100, and provides notification information to the vehicle ( 100). In addition, it is determined whether the upgrade is necessary, and when upgrade is required, software upgrade data for upgrading the software of the corresponding device is transmitted to the vehicle 100.

Hereinafter, the vehicle information transmission method will be divided into abnormal operation information transmission, network error information transmission, and software version information transmission.

3 is a block diagram illustrating a vehicle and a center for transmitting abnormal operation information according to an embodiment of the present invention, FIG. 4 is a CAN message according to an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention. According to the center message. The device 120 and the telematics unit 110 are provided in the vehicle, and the device 120 and the telematics unit 110 are connected to the network through a CAN.

The device 120 includes a determination unit 121 and a CAN transceiver 123. The determination unit 121 stores information about predetermined functions of the device 120 (function 1, function 2, and function 3 in FIG. 3), and periodically determines whether or not the corresponding function operates normally or specifies the specific function. When the function is abnormally operated, the CAN message is configured and transmitted to the telematics unit 110 through the CAN transceiver 123. For example, when an abnormality occurs with respect to the function 3 as shown in FIG. 3, the determination unit 121 determines that the function is abnormal and generates a CAN message and transmits the generated CAN message to the telematics unit 110.

CAN messages are configured to conform to the protocol format. Basically, the message type includes a message type, a message ID, and a data field. The message type indicates whether the message is a periodic message or an event occurrence message. The message ID is identification information for distinguishing the device generating the CAN message from other devices. Data fields define the function corresponding to a specific value.

For example, referring to FIG. 4, the CAN message is an event occurrence message and is generated in a device having a message ID of 0x600. By checking the data field, it can be seen that a data value of 0 is normal operation, 1 is an A function error, 2 is a B function error, and 3 is a C function error. If the data value is 4, it is invalid and may be a reserved value for the extended function if the information of the corresponding CAN message is ignored or the device is an additional function extension.

The telematics unit 110 includes a CAN transceiver 111 and a CDMA modem 113. The CAN transceiver 111 is network-connected via the CAN transceiver 123 of the device 120 provided in the vehicle through CAN, and analyzes the CAN message transmitted from the device 120 to check whether there is an abnormality of the device 120. do. When a specific function of the device 120 is abnormal, a center message is generated and wirelessly transmitted to the center 200 through the CDMA modem 113.

The center message includes a message type, a message ID, and a data field. The message type indicates whether it is a report indicating a notification to the center 200 or a request for requesting data from the center 200. The message ID is identification information for distinguishing the telematics unit 110 that generates the center message from other telematics units. Data fields define the function corresponding to a specific value.

For example, referring to FIG. 5, the center message is a report type message indicating a notification to the center 200 and is generated by a telematics unit having a message ID of 0x8D. In addition, the first data field (Field 1) is information on the number of devices connected via the CAN and the telematics unit 110, the second data field (Field 2) is device information, the third data field (Field 3) Is abnormal operation information (or malfunction information, failure information) of the corresponding device. In FIG. 5, the number of devices is four, the device is an audio device, and the speaker line is shorted.

The center 200 includes a communication unit 210 and receives a center message transmitted from the CDMA modem 113 of the telematics unit 110. The information included in the center message may be analyzed to confirm vehicle information (which can be known from a message ID indicating a telematics unit), abnormal device information, abnormal function, and the like.

FIG. 6 is a view illustrating a difference in ring formation according to whether a network error occurs according to an embodiment of the present invention. FIG.

The network abnormality detection of the CAN is in charge of the telematics unit 110 connected to the center. The telematics unit 110 basically has network IDs of all nodes networked via CAN. Each node corresponds to devices of the vehicle (device A 120a, device B 120b, device C 120c, device D 120d, device E 120e, and the like).

The telematics unit 110 monitors the CAN bus and, if the network ID of a specific device is not detected for a predetermined time, requests the corresponding device to transmit a network message. If the network ID of the device is not detected on the CAN bus even after this request, it is determined that the network is abnormal and stored in memory and notified to the center.

CAN's network configuration forms a ring by sending messages to each node. For example, when there is no network error, the telematics unit 110 forms a normal ring in the order of 0x400, 0x401, 0x402, 0x403, 0x404, and 0x405 through the CAN bus and detects the network ID. However, when an error occurs in the network of the device C 120c, the telematics unit 110 does not detect a network ID of 0x403 for a predetermined time and forms an abnormal ring. In this case, the telematics unit 110 requests a network message transmission to the device C 120c. After that, if the network ID of the device C 120c is not detected, the telematics unit 110 determines that the network of the device C 120c is strange, Notify me.

7 is a conceptual diagram for transmitting software version information according to an embodiment of the present invention, Figure 8 is a diagram showing a method for transmitting software version information according to an embodiment of the present invention.

Referring to FIG. 7, the devices transmit current software version information of each device through the CAN to the telematics unit 110 when the vehicle starts. The telematics unit 110 collects this information and transmits it to the center 200. The center 200 analyzes the received software version information of each device, and determines whether there is a device requiring software upgrade. If there is a device requiring software upgrade, the software upgrade data is transmitted while requesting the software upgrade of the device.

The telematics unit 110 that receives the software upgrade request of the specific device from the center 200 proceeds with the upgrade.

The maximum amount of data that CAN can transmit at one time is eight bytes. The large data uses TP (transponder), but the firmware goes through the process of erasing and writing the microcomputer's flash memory. Therefore, the microcomputer that lacks RAM when transmitting all at once cannot store all the data. Therefore, in the present invention, a method of receiving as much data as necessary and writing to the flash memory and requesting again is suitable.

Referring to FIG. 8, the telematics unit 110 transmits a software upgrade request to the device 120 (S800). In response, the device 120 transmits a response message to the telematics unit 110 (S802).

The telematics unit 110 transmits information about the total size of the file required for the upgrade (S804), and receives a response message from the device 120 (S806).

In addition, by dividing the files necessary for the upgrade into n pieces sequentially, the software can be upgraded using a large file. Here, the size of the divided partial file is preferably equal to or smaller than the size of data that CAN can transmit at one time.

One of the n divided partial files is transmitted (S808), and a response is waited for. After all of the received partial files are written to the flash memory, the device 120 transmits a response message S810 (S810) to receive the next partial file. By repeating this (S812 to S818), the device 120 receives all partial files and performs a software upgrade.

According to the present invention, it is possible to provide the driver with vehicle reliability at all times to provide future vehicle customer retention and superior merchandise than other vehicles. In addition, it can increase customer satisfaction and bring efficiency in vehicle maintenance. And there is an advantage that can build various services linked with the center.

On the other hand, the above-described vehicle information transmission method can be created by a computer program. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the program is stored in a computer readable media, and read and executed by a computer to implement a method for providing a document search service. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

1 is a connection structure diagram of the CAN communication method of devices provided in a vehicle according to an embodiment of the present invention.

2 is a conceptual diagram of a vehicle information transmission method according to an embodiment of the present invention.

3 is a block diagram illustrating a vehicle and a center for transmitting abnormal operation information according to an embodiment of the present invention.

4 is a CAN message according to an embodiment of the present invention.

5 is a center message according to an embodiment of the present invention;

6 is a view showing a ring formation difference according to the presence or absence of network abnormality according to an embodiment of the present invention.

7 is a conceptual diagram for transmitting software version information according to an embodiment of the present invention.

8 is a diagram illustrating a method for transmitting software version information according to an embodiment of the present invention.

100: vehicle 200: center

110: telematics unit 120: device

Claims

In the method for transmitting the vehicle information to the center of the wireless connection between the device provided in the vehicle and a telematics unit connected via a controller area network (CAN),

Receiving, by the telematics unit, a CAN message from the device, wherein the CAN message is generated when one or more functions abnormally operate as a result of determining whether the function performed by the device is normally operated;

Analyzing the CAN message to generate a center message including the device information and the abnormal operation information; and

And transmitting the center message to a center.

The method of claim 1,

The CAN message is a vehicle information transmission method via a CAN, characterized in that the device periodically generated to check whether the normal operation of the function.

The method of claim 1,

And the center message is wirelessly transmitted to the center via a CDMA modem.

In the method for transmitting the vehicle information to the center of the wireless connection between the device provided in the vehicle and the telematics unit connected via CAN,

The telematics unit monitoring a CAN bus to detect network IDs of a plurality of the devices connected through the CAN

Requesting a network message transmission to a device that is not detected for more than a preset time

Determining that the network is abnormal when the network ID of the device is not detected after the network message transmission request; and

And transmitting the information of the device determined to be the network abnormality to the center.

The method of claim 4, wherein

And the CAN bus forms a ring by the telematics unit sending a message to the device and receiving a request for it.

Receiving, by the telematics unit, software version information from the device via the CAN; and

Transmitting the software version information to the center,

And the device transmits software version information of the device when the vehicle is started.

The method of claim 6,

Receiving software upgrade data from the center, wherein the software upgrade data is transmitted from the software version information if the center needs to upgrade software running on the device;

And transmitting the software upgrade data to the device via the CAN.

The method of claim 7, wherein

The software upgrade data transmission step via the CAN,

The telematics unit sending a software upgrade request to the device

Receiving a response to the software upgrade request

Transmitting the total size of the software upgrade data

Partitioning the software upgrade data; and

Vehicle information transmission method via a CAN comprising the step of sequentially transmitting the divided data.

The method of claim 8,

And the size of the divided data is equal to or smaller than the size of data that the CAN can transmit at one time.