KR20130132158A - Can communication system including a plurality of can bus and connecting device - Google Patents

Abstract

The present invention relates to a CAN communication system CAN-communicating through a bus line shared by groups, CAN-communicating with electronic devices included in another group by connecting bus lines to each other when necessary, linked-operating a plurality of bus lines improving the stability of a signal by leaving only two terminal resistances when connecting bus lines to each other. For this reason, the present invention divides the electronic devices into a plurality of groups, has a bus line connected to terminate the resistances on both ends in each group, makes electronic devices included in a group CAN-communicate with each other, connects electrically the bus lines to each other, has integral bus lines, has a relay which electrically separates from the bus lines other terminating resistances except for the two connected to the integral bus lines, and can select only one of the performing CAN-communicating between the electronic devices of the same group and perform CAN-communicating between the electronic devices of the same groups or other groups.

Description

CAN COMMUNICATION SYSTEM INCLUDING A PLURALITY OF CAN BUS AND CONNECTING DEVICE}

The present invention divides electronic devices into a plurality of groups and performs can communication through bus lines shared by groups, and if necessary, connects bus lines to each other to communicate with each other by electronic devices belonging to different groups and to connect bus lines to each other. The present invention relates to a can communication system in which a plurality of bus lines are connected to each other to improve signal stability by leaving only two termination resistors at a time.

In general, CAN (Controller Area Network) is a vehicle network system that was originally developed to communicate data between various electronic devices in a vehicle, and has excellent price / performance ratio and adverse effects such as shock, vibration, noise, and high temperature. In addition to providing a stable and reliable communication environment in the vehicle, it has been popularized for vehicles, and further widely applied in other fields besides the automobile field.

1 is a general configuration diagram of a can communication system, which is connected to both ends of a bus line 20 and a bus line 20 each consisting of two communication lines CAN_H and CAN_L to configure the bus line 20 as a closed circuit. Termination resistors (30, 40), and the electronic device 10 connected to the bus line 20 to communicate with each other.

Here, the terminating resistors 30 and 40 are for stabilizing signals through the bus line 20 by suppressing the carrier wave and keeping the potential difference constant, which are two essential components mounted on the bus line 20.

In addition, the electronic device 10 includes a control unit 10-1 performing a given task and a transceiver 10-2 connected to the bus line 20, so that the control unit 10-1 is a transceiver. It is connected to the bus line 20 through 10-2 to communicate with the control unit 10-1 of the other electronic device 10. The control unit 10-1 may be, for example, an automobile, such as an engine management system (EMS), a transmission management system (TMS), an anti-lock break system (ABS), an immobilizer device, an airbeck control device, a trip computer, Means for the operation of the vehicle, such as various sensors, generators, transformers, devices for the safety of the vehicle, devices for displaying and managing the state of the vehicle, the transceiver 10-2 is such a control unit ( Each of the electronic devices 10 is mounted to each of the connectors 10-1 in the form of a connector.

Among the electronic devices, the engine control system (EMS) or the shift control system (TMS) may have built-in terminating resistors. Since it is connected to (20), the connection of the terminating resistor may be omitted or only one connection may be made.

In recent years, the number of electronic devices to be mounted in the past for the purpose of precision control, safety specifications, convenience specifications, etc. is increasing continuously. Furthermore, due to the emergence of hybrid or electric vehicles, In addition to the increase, the electronic devices are in close communication with each other.

However, when the electronic devices are connected to one CAN bus to communicate with each other, the communication load rate of the CAN bus increases significantly, thereby preventing a stable communication environment.

In order to solve this problem, among the electronic devices to be installed, they are classified into electronic devices to be interoperated according to their functions to form a group, and a canvas can be prepared for each group to be used only between electronic devices belonging to the same group. A method of communicating with each other can be employed. However, this method is limited in implementing various functions in terms of utilization of electronic devices due to the limitation in communication between electronic devices belonging to different groups.

In addition, it is also possible to think of a method of connecting canned buses separated from each other by a relay device to select and relay only can messages between electronic devices belonging to different groups, but it is difficult and costly to design and manufacture the relay device.

On the other hand, since the CAN has a content-oriented characteristic of an addressless broadcast method, the system configuration flexibility is large. Thus, even after the initial network is configured, it is very easy to change the structure or add or delete new nodes. Therefore, it is desirable to make the most of the flexibility of the system configuration when configuring the can communication system.

KR 10-2009-0010454 A 2009.01.30. KR 10-2011-0032521 A 2011.03.30. KR 10-2009-0011807 A 2009.02.02. KR 10-2010-0055263 A 2010.05.26.

Accordingly, in the can communication system for communication between a plurality of electronic devices, the present invention forms a group of electronic devices according to a predetermined criterion in order to reduce complexity and reduce the load ratio of the CAN bus, but the flexibility of the system configuration is increased. It is possible to provide a can communication system that utilizes a great advantage to communicate between different groups, and also connects and operates a plurality of buslines that stabilize the communication environment by processing termination resistance when communicating between different groups.

According to an aspect of the present invention, there is provided a CAN communication system for transmitting CAN messages between a plurality of electronic devices, wherein the bus lines are divided into a plurality of groups and each terminal has a bus line connected to a terminal resistor. The CAN communication between the electronic devices belonging to the group can be performed, but each bus line is electrically connected to each other to form an integrated bus line, while leaving only two termination resistors connected to the integrated bus lines. A relay electrically disconnecting from the integrated bus line is provided at the end of the bus line to which the terminating resistor is connected, so that only the electronic devices belonging to the same group can communicate with each other. It is possible to selectively select any one of the operations that can communicate with each other. do.

The relay may include: a first relay installed at one end of each bus line, the first relay electrically separating one end resistor connected to one end from the bus line and electrically connecting one end of each bus line to each other; And a second relay installed at the other end of the remaining bus lines except for two predetermined bus lines among the bus lines, and electrically disconnecting the termination resistor connected to the other end from the bus line. It is characterized in that the bus lines are branched from the link line by connecting them in parallel to the link line.

The relay may include: a first relay installed at one end of each bus line, the first relay electrically separating one end resistor connected to one end from the bus line and electrically connecting one end of each bus line to each other; And a second relay installed at the other end of each bus line to electrically disconnect the terminating resistor connected to the other end from the bus line. The second relay is operated to operate the first relay in parallel to one connection line. In the connected state, it is characterized in that the terminal resistor is separated from the bus line by operating the remaining second relays while leaving only two second relays according to a predetermined selection criterion.

The relay is characterized in that the bus lines are formed as one bus line by electrically connecting the bus lines in series and electrically disconnecting the termination resistance of the connection point.

According to the present invention configured as described above, the plurality of CAN communication bus lines can be connected to each other only by the operation of a relay to easily implement an integrated bus line, as well as two terminations on an integrated bus line composed of a plurality of bus lines. Only the resistors are connected to ensure the quality of the communication.

In addition, since the present invention forms a group to perform can communication between highly correlated electronic devices that must always communicate with each other, even if the number of electronic devices to be mounted is large, the communication load generated in each busline can be greatly reduced. In addition, since the bus lines can be connected to each other as necessary, communication between electronic devices having a relatively small number of times of communication with each other can be temporarily performed, thereby maximizing the communication environment between the electronic devices, thereby increasing the utilization of the electronic devices.

1 is a block diagram of a can communication system according to the prior art.
2 is a block diagram of a can communication system for interoperating a plurality of bus lines according to a first embodiment of the present invention.
3 is a circuit configuration diagram before connecting a plurality of bus lines to each other in the first embodiment of the present invention;
4 is a circuit configuration diagram after connecting a plurality of bus lines with each other in the first embodiment of the present invention.
FIG. 5 is a circuit diagram illustrating that only some bus lines among a plurality of bus lines can be selectively connected in the first embodiment of the present invention.
6 is a block diagram of a can communication system for linkage operation of a plurality of bus lines according to a second embodiment of the present invention.
7 is a block diagram of a can communication system for interoperating a plurality of bus lines according to a third embodiment of the present invention.
8 is a block diagram of a can communication system for interoperating a plurality of bus lines according to a fourth embodiment of the present invention.
9 is a block diagram of a can communication system for linkage operation of a plurality of bus lines according to a fifth embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are used to denote the same or similar components in other drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a block diagram of a can communication system for linking and operating a plurality of bus lines according to a first embodiment of the present invention.

Referring to FIG. 2, the CAN communication system according to the present invention includes a plurality of bus lines 21, 22, which connect terminal resistors 31, 32, 33, 34, 41, 42, 43, and 44 to both ends, respectively. 23, 24) and a relay which electrically connects each bus line to each other to form an integrated bus line, and at the same time, leaves only two terminal resistors connected to the integrated bus line and electrically separates the remaining terminal resistors from the integrated bus line. 51, 52, 53, 54, 62, and 63, a relay controller 70 for controlling the relay, and an interconnection line 80 that becomes a connection path when the bus lines are electrically connected. In addition, the plurality of electronic devices 11, 12, 13, and 14 are connected to the bus lines 21, 22, 23, and 24, respectively.

Here, the electronic devices 11, 12, 13, and 14 are divided into a plurality of groups so that the electronic devices belonging to the same group are connected to the same bus line. In other words, the electronic devices to be CAN-communicated by the CAN communication system are divided into groups based on the functions of the electronic devices and the interrelationships between the electronic devices. Connecting electronic devices to share the same bus line. In the first embodiment of the present invention, since four groups are illustrated, four bus lines are provided, but the number of groups may be determined according to a function to be implemented by interworking electronic devices.

The terminating resistors 31, 32, 33, 34, 41, 42, 43, and 44 are connected to both ends of each of the bus lines 21, 22, 23, and 24 so that each bus line is closed. In other words, since the bus lines used in the can communication consists of two communication lines, the two communication lines at both ends are connected to each other through the termination resistor. Such a terminating resistor is to stabilize a signal transmitted through a bus line by suppressing a carrier wave and keeping a potential difference constant, and two terminal resistors are essential components mounted on a can communication bus line. According to ISO 11898-2, the termination resistor uses a resistor in the range of 100Ω to 130Ω, but generally 120Ω.

The link line 80 is a passage that is electrically connected to bus lines according to the operation of the relay to electrically connect the bus lines to each other, and is made of two communication lines like the bus lines.

The relays 51, 52, 53, 54, 62, and 63 are installed at one of the ends of the bus lines to which the terminating resistors are connected. The relays 51, 52, 53, 54, 62, and 63 are connected to the same bus line with their respective terminating resistors connected to the bus lines. Separate communication for each channel allowing communication between connected electronic devices, and an interconnection that enables communication between electronic devices connected to different bus lines as well as communication between electronic devices connected to the same bus line by electrically connecting respective bus lines with each other. Selectively communicate one of the communication.

According to the first embodiment of the present invention, the relays (51, 52, 53, 54, 62, 63) and the first relay (51, 52, 53, 54) installed at one end of each bus line, The second relays 62 and 63 are installed at the other ends of the remaining bus lines 22 and 23 except for two predetermined bus lines 21 and 24 among the bus lines. In the drawing illustrated in FIG. 2, a first bus line 21 and a fourth bus line 24 are selected to connect the second relay 62 to the second bus line 22 and the third bus line 23. 63) is installed. In other words, the terminal resistors 41 and 44 provided at the other ends of the first bus line 21 and the fourth bus line 24 are always connected to the bus lines regardless of the operation of the relay.

In detail, the first relays 51, 52, 53, and 54 electrically disconnect the terminating resistor connected to one end of the bus line from the bus line and simultaneously connect one end of the bus line to the link line 80. To work.

In the embodiment of the present invention for this purpose, the first relay is configured as a three-way switch. The three-way switch is a three-terminal switch having a common terminal, a contact terminal, and a b contact terminal. If the current does not flow through the movable coil with the built-in coil, the common terminal is connected to the b contact terminal and common when the current flows through the movable coil. It operates to connect terminal to contact terminal a. And, the installation of the first relay consisting of a three-way switch, the common terminal is connected to the bus line, a contact terminal is connected to the connection line 80, b contact terminal is connected to the termination resistor, the movable coil is the relay controller ( 70). Since the bus line consists of two communication lines, the first relay is composed of two three-switches which are contacted by one movable coil. Here, the operation of the first relay composed of the three-way switch means converting the common terminal to the state in which the common terminal is connected to the a contact terminal while the common terminal is connected to the b contact terminal.

Accordingly, if the relay controller 70 does not supply electricity to the movable coil, the terminating resistor may be connected to the bus line. If the relay controller 70 supplies electricity to the movable coil, the terminating resistor may be separated from the bus line and the bus line may be disconnected. To be connected to the connection line (80). When the relay controller 70 simultaneously supplies electricity to the movable coils of the first relays 51, 52, 53, and 54 installed on the bus lines, the bus lines 21, 22, 23, and 24 may be disconnected. By connecting to the connection line 80 to form an integrated bus line electrically connected to each other, the terminating resistors 31, 32, 33, 34 of one end is to be electrically separated from the integrated bus line.

The second relays 62 and 63 are configured to selectively connect the terminal resistors 42 and 43 at the other end to the bus line. In the embodiment of the present invention, the second relays 62 and 63 are formed of disconnecting switches which operate by contact coils. Accordingly, when the relay controller 70 supplies electricity to the movable coils of the second relays 62 and 63, the terminating resistors 42 and 43 are connected to the bus line, thereby supplying electricity to the movable coils. When stopped, the terminating resistors 42 and 43, which were connected to the other ends of the bus lines 22 and 23, can be electrically disconnected. Here, the operation of the second relay composed of the disconnect switch is to convert the electricity supply to the state in which the electricity supply is stopped while the electricity is supplied to the movable coil.

In the CAN communication system according to the present invention, the relay controller 70 configures the circuit shown in FIG. 3 or the circuit shown in FIG. 4.

FIG. 3 is a circuit diagram before connecting a plurality of bus lines in the first embodiment of the present invention, and FIG. 4 is a circuit diagram after connecting a plurality of bus lines in the first embodiment of the present invention.

The circuit diagram shown in FIG. 3 shows the termination resistors 31, 32, 33, 34, 41, 42, 43, and 44 so as to be connected to the bus lines 21, 22, 23, and 24. As the first relays 51, 52, 53, 54 and the second relays 62, 63 are operated, the respective bus lines 21, 22, 23, and 24 are electrically separated from each other. Accordingly, electronic devices connected in groups by bus lines communicate with each other only within the group. Of course, the link line 80 is not connected to the bus line.

Next, the circuit diagram shown in FIG. 4 operates the first relays 51, 52, 53, and 54 to connect one end of the bus lines 21, 22, 23, and 24 to the connection line 80. Terminal resistors 31, 32, 33, and 34, which are connected to one end, are electrically disconnected from the bus line, and the second relays 62 and 63 are operated to operate some of the bus lines 22 and 23. The terminating resistors 42 and 43 connected to the other end are electrically separated from the bus line. As described above, some of the bus lines 22 and 23 are provided with the second relays 62 and 63 as the remaining bus lines 22 and 23 except for the two predetermined bus lines 21 and 24 as described above. It becomes a bus line.

Accordingly, as can be seen in FIG. 4, the bus lines 21, 22, 23, and 24 connect one end to the link line 80 in parallel to form a circuit branched from the link line 80. And all electronic devices 11, 12, 13, and 14 may communicate with each other through an integrated bus line including bus lines 21, 22, 23, and 24 and an interconnection line 80 electrically connected to each other. have.

In addition, there are only two termination resistors left in the integrated bus line, which enables stable can communication through the integrated bus line. As described above, in order to explain the exemplary embodiment of the present invention, in FIG. 2, terminal resistors 41 and 44 connected to the other ends of the first bus line 21 and the fourth bus line 24 are connected to the integrated bus line. It stays connected.

In other words, the can communication system according to the present invention is an intra-group communication environment that allows electronic devices divided into groups to communicate only between electronic devices belonging to the same group, and between electronic devices belonging to the same group as well as different groups. By selectively providing an integrated communication environment that enables can communication, the communication environment within the group is usually provided to reduce the load rate and provide an integrated communication environment in case of emergency or when necessary to cope with an emergency situation or perform a necessary operation.

And, in order to provide such a selective communication environment, instead of using a separate relay device, it is made of a relay which is a simple component, it is possible to easily configure the can communication system.

In addition, only two termination resistors are connected to the integrated bus line by the operation of the relay, thereby making can communication stable.

4, all bus lines 21, 22, 23, and 24 are connected to the link line 80 to form an integrated bus line. However, the bus lines 21, 22, 23, and 24 are connected to the link line 80. You can also select which bus lines make up the line.

FIG. 5 is a circuit diagram illustrating that only some bus lines may be selectively connected among a plurality of bus lines.

Referring to FIG. 5, the first bus line 21, the second bus line 22, and the fourth bus line 24 are connected to each other to form an integrated bus line, but the third bus line 23 is integrated. Not connected to the bus line.

To this end, the operation of the relays 51, 52, 53, 54, 62, 63 is performed by operating the first relays 51, 52, 54 of the first, second, and fourth bus lines 21, 22, and 24. Terminating resistors 31 and 32 which were connected to the 1,2,4 bus lines 21, 22 and 24 to the connection line 80 and connected to one end of the first and second bus lines 21, 22 and 24. , 34 is electrically disconnected, while the first relay 53 of the third bus line 23 is not operated so as not to be connected to the link line 80 and at one end of the third bus line 23. The terminating resistor 33 is left connected to the third bus line 23.

Then, the second relay 52 of the second bus line 22 is operated to electrically separate the termination resistor 42 connected to the other end of the second bus line 22, while the third bus line ( The second relay 53 of 23 does not operate to leave the terminating resistor 43 at the other end of the third bus line 23 connected to the third bus line 23.

Accordingly, the first group electronic devices 11 connected to the first bus line 21, the second group electronic devices 12 connected to the second bus line 22, and the fourth bus line 24 connected thereto. The fourth group electronic devices 14 may not only communicate with the electronic devices belonging to the same group but also can communicate with the electronic devices belonging to another group, but the third group electronics connected to the third bus line 23. The devices 13 can communicate with each other only within a group.

In FIG. 5, an example of configuring an integrated bus line using first, second, and fourth bus lines 21, 22, and 24 is shown. You can select a line. When selecting a bus line and configuring an integrated bus line, the two predetermined bus lines with the other terminal resistor always connected (without installing the second relay) are included in the integrated bus line. A first relay provided at one of two predetermined bus lines is operated. Then, the bus line selected from the remaining bus lines except for the two previously selected bus lines is included in the integrated bus line, and for this purpose, the first and second relays of the selected bus lines are operated.

In addition, in the case of configuring an integrated bus line by connecting only the bus lines 22 and 23 that do not have the second relay connected to the link line 80, a predetermined selection criterion is selected from among the bus lines connected to the link line 80. Except the two bus lines selected according to the above, the second relay of the remaining bus lines is operated to isolate the terminating resistor at the other end. In the exemplary embodiment illustrated in FIG. 2, since only the second and third bus lines 22 and 23 in which the second relays 62 and 63 are installed are connected to the second and third bus lines 22 and 23. When configuring the integrated bus line, the second relays 62 and 63 are not operated to leave the terminating resistors of the other ends of the second and third bus lines 22 and 23 connected.

Of course, if the can communication system is configured to select the bus lines included in the integrated bus lines as shown in FIG. 5, it is possible only when the total bus lines are three or more.

On the other hand, the can communication system according to the first embodiment of the present invention does not install the second relays 62 and 63 in the bus lines 21 and 24 that are selected in advance, but the second relays are installed in all the bus lines. It is then possible to leave only two of the second relays and run the rest so that only two termination resistors are connected to the integrated bus line.

6 is a block diagram of a can communication system for linkage operation of a plurality of bus lines according to a second embodiment of the present invention.

In the CAN communication system according to the second embodiment of the present invention, when a relay composed of first and second relays is installed as in the first embodiment shown in FIG. 2, the can communication system includes a first relay 51 at one end of each bus line. And 52, 53, 54, and second relays 61, 62, 63, 64 at the other end of each bus line. When the integrated bus line is circuit-configured, all of the first relays 51, 52, 53, and 54 are operated to connect all the bus lines 21, 22, 23, and 24 to the link line 80, Select two second relays according to the preset selection criteria among the second relays 61, 62, 63, and 64 and operate the remaining second relays to integrate termination resistors connected to the remaining second relays. Electrically isolated from, ensure that only two termination resistors are connected to the integrated bus line.

In addition, in the case of forming an integrated bus line by selecting bus lines, since the second relays 61, 62, 63, and 64 are installed in all bus lines, the operation of the first relay installed at one end of the selected bus lines is performed. The integrated bus line is configured, and after selecting two second relays according to preset selection criteria among the second relays respectively installed at the other ends of the selected bus lines, the remaining second relays which are not selected are operated to terminate the other ends. It acts to electrically isolate the resistor from the integrated busline.

7 is a configuration diagram of a can communication system for linkage operation of a plurality of bus lines according to a third embodiment of the present invention.

Referring to FIG. 7, electronic devices 11 ′ and 14 ′ having termination resistors 41 ′ and 44 ′ among the electronic devices are connected to the first bus line 21 and the fourth bus line 24, respectively. It is connected. In addition, only one terminal resistor 31 and 34 is connected to the bus lines 21 and 24 connecting the electronic devices 11 'and 14' having the terminal resistors 41 'and 44' embedded therein. The first relays 51 and 54 are installed at this connected portion, and the second relay is not installed. An electronic device with a built-in terminating resistor is an example of an engine management system (EMS) installed in an automobile.

When the electronic devices 11 'and 14' having the terminal resistors 41 'and 44' are connected to the can communication system according to the present invention, the electronic devices having the terminal resistors 41 'and 44' are incorporated. The number of (11 ', 14') shall be two or less. In addition, when connecting two electronic devices 11 'and 14' having termination resistors 41 'and 44', the two electronic devices 11 'and 14' are not connected to one bus line. Two bus lines are selected so that only one electronic device 11 ', 14' having terminal resistors 41 ', 44' is connected to one bus line. This is to connect all the bus lines 21, 22, 23, and 24 to form an integrated bus line and to leave only two termination resistors in the integrated bus line.

Of course, the bus lines 22 and 23 to which only electronic devices that do not have built-in terminating resistors are connected, but terminating resistors may be connected to both ends thereof, and the first and second relays may be separated, and the first and second relay lines 80 may be connected. Enable to connect to

When the bus line to which the electronic devices 11'14 'including the terminating resistors 41' and 44 'are connected is included in the integrated bus line, the terminating resistor remaining in the state connected to the integrated bus line is 2; Since only two are left in the integrated bus line, the terminating resistors 41 'and 44' are embedded in the electronic device 11'14 '.

Of course, if the terminal resistors 41 'and 44' can be separated from the electronic devices 11 'and 14', or if a relay can be installed at the site where the terminal resistors 41'44 'are embedded, It can be implemented as in the second embodiment.

8 is a configuration diagram of a can communication system for linkage operation of a plurality of buslines according to a fourth exemplary embodiment of the present invention.

Referring to FIG. 8, the relay connects bus lines 21, 22, 23, and 24 in series to form an integrated bus line, which is formed as one can communication bus line, and is connected to a connection point between bus lines. The termination resistors 31,32.42.43.33.34 were electrically separated from the integrated busline, leaving the termination resistors 41 and 44 only at both ends of the series-connected integrated busline.

In other words, the first relays 51 and 52, 52 'and 53', 53 and 54, respectively, are installed in the terminal resistors facing each other when the bus lines to which the terminating resistors are connected at both ends are arranged in series. Accordingly, the above-described connection lines 80 are connected between the first relays facing each other. In other words, the fourth embodiment of the present invention does not include the above-described second relay, which separates the termination resistor from the bus line at the point for connecting the bus lines to each other and simultaneously connects the bus line to the connection line 80. This is because a first relay is needed to connect to the. In the exemplary view of FIG. 8, three linkage lines 80 are required.

Accordingly, in the CAN communication system according to the fourth embodiment of the present invention, when the first relays 51 and 52, 52 'and 53', 53 and 54 are operated, the bus lines are electrically arranged in line by the connection lines. As soon as they are connected, the terminating resistors at the connection points between the bus lines are separated and remain in one terminal resistor 41 remaining in the first bus line 21 placed first and in the fourth bus line 24 placed last. The terminating resistor 44 is connected to the integrated bus line.

Meanwhile, according to the fourth exemplary embodiment of the present invention illustrated in FIG. 8, the number of bus lines connected to the bus lines may be selectively changed. For example, when only the first, second, and third bus lines 21, 22, and 23 are connected in a line to form an integrated bus line, the fourth bus line 24 is the last from the third bus line 23. The second relay 53 to be connected to the terminal resistor is not operated so that the terminating resistor is connected and is not connected to the fourth bus line 24.

9 is a configuration diagram of a can communication system for linking and operating a plurality of bus lines according to a fifth embodiment of the present invention.

Referring to FIG. 9, the CAN communication system according to the fifth embodiment of the present invention divides electronic devices into two groups and uses only two bus lines 21 and 22. In this case, each bus line (21, 22) is connected to the terminating resistor at both ends, but the second relay (51, 52) is provided only at one end to separate the terminating resistors (31, 32) at one end and At the same time it is electrically connected to each other by the connection line (80). Here, the second relay described above is not necessary.

As described above, the can communication system according to the present invention divides electronic devices into a plurality of groups and prepares bus lines for each group to transmit and receive can messages between electronic devices belonging to the group. By connecting, you can send and receive can messages between electronic devices belonging to different groups.

To this end, the electronic devices can be configured to can communicate with electronic devices belonging to the same group as well as electronic devices belonging to different groups according to a user's selection. In other words, the can message for can communication is reconfigured into a form that can be placed on the can communication bus line in consideration of characteristics such as sender, receiver, signal length, transmission cycle, and time-related characteristics such as deadline, In addition to the electronic device, it is configured to generate a can message to be sent to other groups of electronic devices. In addition, the can communication made in each bus line should be compatible with each other, so that stable can communication can be made even in an integrated bus line in which bus lines are electrically connected to each other. For example, it is necessary to match the transmission format of the can message transmitted through each busline and also to match the delivery period of the can message. In addition, since CAN communication assigns an identifier to a message to determine bus access priority, it is necessary to assign an identifier of a message in consideration of a state configured as an integrated bus line.

Meanwhile, the relay controller 70 may perform a relay control operation manually by a user. Alternatively, the relay controller 70 may perform a relay control operation by an electronic device selected by the user. In addition, the relay controller 70 may be connected to the bus line connecting the electronic device selected by the user to receive a command from the electronic device through the can communication to perform a relay control operation. Of course, the relay controller 70 notifies each electronic device through the integrated bus line to start the communication between different groups through the integrated bus line after configuring the integrated bus line by operating the relay. It is also possible.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

10,11,12,13,14: Electronic device
10-1: Control Unit (ECU) 10-2: Transceiver
20,21,22,23,24: Bus line 30,31,32,33,34: Termination resistor
40, 41, 42, 43, 44: Terminating resistors 51, 52, 53, 54: First relay
61,62,63,64: second relay
70: relay controller 80: connection line

Claims (6)

In a can communication system for transmitting a can message between a plurality of electronic devices,
The electronic devices are divided into a plurality of groups, and bus lines connecting terminal resistors at both ends are prepared for each group to perform can communication between the electronic devices in the group.
Each bus line is electrically connected to each other to form an integrated bus line, and at the same time, a relay is connected to a relay that electrically separates the remaining terminal resistors from the integrated bus line, leaving only two termination resistors connected to the integrated bus line. Equipped at the end of the line,
Multiple can be selectively selected from the operation of performing can communication only between the electronic devices belonging to the same group and the operation of performing can communication between the electronic devices belonging to the same group as well as different groups. Communication system that links the bus lines of the bus. The method of claim 1,
The relay includes:
A first relay installed at one end of each bus line, the first relay electrically disconnecting a terminating resistor connected to one end from the bus line and at the same time electrically connecting one end of each bus line to each other; And
A second relay installed at the other end of the remaining bus lines except for two predetermined bus lines among the bus lines, the second relay electrically separating the termination resistor connected to the other end from the bus line;
Consisting of,
A can communication system for linking and operating a plurality of bus lines, characterized in that the bus lines are connected in parallel to one linking line so that the bus lines are branched from the linking line. The method of claim 1,
The relay includes:
A first relay installed at one end of each bus line, the first relay electrically disconnecting a terminating resistor connected to one end from the bus line and at the same time electrically connecting one end of each bus line to each other; And
A second relay installed at the other end of each bus line, the second relay electrically separating the terminal resistor connected to the other end from the bus line;
Consisting of,
Operating the first relay to connect the bus lines in parallel to one linking line, leaving only two second relays according to a predetermined selection criterion and operating the remaining second relays to separate the termination resistors from the bus lines. Can communication system for connecting and operating a plurality of bus lines, characterized in that. The method of claim 1,
The relay includes:
A can communication system for interoperating a plurality of bus lines, characterized in that the bus lines are formed as one bus line by electrically connecting the bus lines in series and electrically separating the terminating resistors of the connection points. The method according to any one of claims 2 to 4,
There should be 2 or less electronic devices with built-in terminating resistors, but no two are connected to one bus line.
One terminal resistor and the relay are installed in a bus line to which an electronic device with a built-in termination resistor is connected, so that only two termination resistors remain when the integrated bus line is formed according to the operation of the relay. Can communication system for interoperating with a plurality of bus lines, characterized in that it comprises a. 6. The method of claim 5,
The bus line is composed of three or more,
The relay is configured to select a bus line to be configured as an integrated bus line among the bus lines, the operation of the plurality of bus lines, characterized in that only two termination resistors remain in the integrated bus line composed of the selected bus line Can communication system.

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