JP2005335622A - In-vehicle device and communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-vehicle device and a communication device capable of reducing a burden in designing an electronic control unit connected to an in-vehicle LAN arranged on a vehicle, restraining cost and preventing early consumption of a battery, etc. <P>SOLUTION: A processing part 120 used as the electronic control unit to carry out an electronic control process concerning the vehicle and a communication control part 110 to control communication with other devices loaded on the vehicle are separated from each other. The communication control part 110 is furnished with an electric power source circuit 112 to supply electric power supplied from a feeder L1 to the inside and the processing part 120, and an ON/OFF of the electric power supply or communication LSI 113 changes stand-by mode/operation mode over to each other in the case of receiving an electric power change-over signal from an electric power control signal line L3 or the processing part 120. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an in-vehicle device including an electronic control unit mounted on a vehicle and a communication device such as a connector, and more particularly to an in-vehicle device and a communication device that connect to an in-vehicle LAN and perform communication processing.

In recent years, various devices mounted on vehicles have been steadily increasing, and as the number of devices increases, the number of wire harnesses connecting between the devices also increases, thereby ignoring problems such as an increase in the weight of the wire harness. It is in a state that can not be. Therefore, as one of the weight reductions of the vehicle, a method of saving the wire harness arranged in the vehicle by constructing a network (vehicle-mounted LAN) inside the vehicle has been proposed. In addition, various electronic control units (ECUs) that perform electronic control processing related to vehicles have started to appear with a communication function that can multiplex and transmit / receive signals corresponding to the in-vehicle LAN. An electronic control unit mounted on a vehicle is disclosed in Patent Document 1, for example.
JP 2003-324824 A

  However, as disclosed in Patent Document 1, since the electronic control unit is directly connected to a wire harness such as an in-vehicle LAN provided in the vehicle, the design of the original function of the electronic control unit is required when designing the electronic control unit. In addition to the above, it is necessary to design communication functions. However, when designing the communication function, if the vehicle type, the in-vehicle LAN interface to be connected, and the communication conditions such as the communication protocol are different, the communication function must be designed according to each condition, and the burden on the hardware and software design. In addition, there is a problem that the cost increases due to an increase in the number of models.

  The present invention has been made in view of such circumstances, and by separating the processing unit having the original function of the electronic control unit and the communication control unit having the function related to communication, the burden of designing the processing unit is reduced. While reducing the cost and controlling the cost, the communication control unit controls the power supplied to the processing unit, so that the communication control unit controls the power without controlling the power. An object of the present invention is to provide an in-vehicle device that can prevent, for example, premature exhaustion of a storage battery due to overdischarge, and a communication device such as a connector connected to the in-vehicle LAN, while reducing the burden at the time of designing a processing unit.

  An in-vehicle device according to a first aspect of the present invention is an in-vehicle device connected to a power supply line, wherein a power is supplied from the power supply line and a communication control unit that controls communication with another device mounted on the vehicle, and the communication control unit And a processing unit that executes electronic control processing related to the vehicle with the power supplied from the communication control unit, the communication control unit supplying power supplied from a feeder to the inside and the processing unit A power switching signal for requesting switching of power supplied from the power supply circuit; and switching means for switching power supplied from the power supply circuit based on the received power switching signal. And

  In the present invention, by separating the processing unit functioning as an electronic control unit and the communication control unit having the function of executing the communication control process, it is not necessary to consider the design related to the communication process when designing the processing unit. It is possible to reduce the design burden, and even if the communication conditions such as the in-vehicle LAN interface to be connected are different, it is possible to cope with the design change of only the communication control unit, so there is a substantial increase in the number of models. The cost can be reduced by suppressing the cost. In addition, the communication control unit has a function of controlling power, specifically, a function of transforming the power supplied to the inside and the processing unit in accordance with an external power switching signal, thereby controlling the power supplied to the processing unit. By allowing the communication unit to perform the power control by the communication control unit without performing the power control by the processing unit, for example, the storage battery due to overdischarge is reduced while reducing the burden when designing the processing unit. It is possible to prevent premature wear.

  According to a second aspect of the present invention, there is provided the in-vehicle apparatus according to the first aspect, wherein the communication control unit is connected to a power control signal line serving as a medium for a power switching signal, and the receiving means receives power from the power control signal line. It is characterized by receiving a switching signal.

  In the present invention, by performing transformation in accordance with the power switching signal transmitted through the power control signal line, for example, it is possible to switch the power to be supplied based on the on / off of the ignition, and thus interlock with the ignition. It is possible to control the power supplied to the processing unit, and it is possible to obtain effects such as prevention of early consumption of the storage battery.

  In the in-vehicle device according to a third aspect of the present invention, in the first aspect or the second aspect, the processing unit includes a unit that transmits a power switching signal to the communication control unit, and the reception unit that the communication control unit includes The power switching signal is received from the unit.

  In the present invention, for example, when the processing unit has a function as a keyless entry system, power is supplied by processing of the processing unit by transmitting a power switching signal from the processing unit receiving the door open radio wave to the communication control unit. Since it is possible to supply power only when it is determined that the battery is necessary, it is possible to obtain effects such as prevention of early consumption of the storage battery.

  According to a fourth aspect of the present invention, there is provided the vehicle-mounted device according to any one of the first to third aspects, wherein the switching means included in the communication control unit is configured to switch on / off of the supplied power based on a power switching signal. It is characterized by being.

  In the present invention, it is possible to obtain effects such as prevention of early consumption of the storage battery by switching on / off of the supplied power.

  According to a fifth aspect of the present invention, there is provided the in-vehicle device according to any one of the first to fourth aspects, wherein the switching means included in the communication control unit is configured to switch standby power / operating power based on a power switching signal. It is characterized by being.

  In the present invention, it is possible to obtain effects such as prevention of early consumption of the storage battery by switching the standby power / operating power.

  According to a sixth aspect of the present invention, there is provided a communication device including a communication control unit that controls communication with other devices mounted on a vehicle, and means for connecting to a power supply line and on-vehicle electronic that executes electronic control processing related to the vehicle. A means for connecting to the device; a power supply circuit for supplying the power supplied from the power supply line to the in-vehicle electronic device internally and connected; and a power switching signal for requesting switching of the power supplied from the power supply circuit And means for switching the power supplied from the power supply circuit based on the received power switching signal.

  In the present invention, the on-board electronic device functioning as an electronic control unit is connected as a connector, and communication with other devices is enabled via the on-vehicle LAN, so that the design related to communication processing is considered when designing the on-vehicle electronic device. Since it is not necessary, it is possible to reduce the design burden. Moreover, the present invention has a function of supplying power to the in-vehicle electronic device and controlling the supplied power, specifically, a function of transforming the power supplied to the inside and the in-vehicle electronic device in accordance with a power switching signal from the outside. By controlling the power supplied to the in-vehicle electronic device, the electric power is controlled without controlling the power in the in-vehicle electronic device, thereby reducing the burden when designing the in-vehicle electronic device. However, it is possible to prevent, for example, early consumption of the storage battery due to overdischarge.

  According to a seventh aspect of the present invention, there is provided a communication device including a communication control unit that controls communication with another device mounted on a vehicle, a power supply line connected to a power source, and an in-vehicle electronic device that executes electronic control processing related to the vehicle. Means for connecting to the device; a power supply circuit for supplying the power supplied from the power supply via the feeder line to the in-vehicle electronic device connected internally; and power switching for requesting switching of the power supplied from the power supply circuit It is characterized by comprising means for receiving a signal and means for switching the power supplied from the power supply circuit based on the received power switching signal.

  In the present invention, by connecting to a vehicle-mounted electronic device functioning as an electronic control unit as a connector with a power supply line and enabling communication with other devices via the vehicle-mounted LAN, design related to communication processing at the time of designing the vehicle-mounted electronic device Therefore, it is possible to reduce the design burden. Moreover, the present invention has a function of supplying power to the in-vehicle electronic device and controlling the supplied power, specifically, a function of transforming the power supplied to the inside and the in-vehicle electronic device in accordance with a power switching signal from the outside. By controlling the power supplied to the in-vehicle electronic device, the electric power is controlled without controlling the power in the in-vehicle electronic device, thereby reducing the burden when designing the in-vehicle electronic device. However, it is possible to prevent, for example, early consumption of the storage battery due to overdischarge.

  In the in-vehicle device and the communication device according to the present invention, communication for controlling communication between a processing unit (or in-vehicle electronic device) used as an electronic control unit that executes electronic control processing related to the vehicle and other devices mounted on the vehicle. Separate the control unit (or communication device). The communication control unit includes a power supply circuit that supplies power supplied from the power supply line to the inside and the electronic control unit. When a power switching signal is received from the power control signal line or the electronic control unit, the communication control unit turns on / off the supplied power. Switch off or standby power / operating power.

  With this configuration, for example, the power supplied based on the power switching signal based on the on / off of the ignition and the door open radio wave received by the keyless entry system is transformed, so it is possible to prevent the supply of excessive power. There are excellent effects such as being able to obtain effects such as prevention of early consumption of the storage battery.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of an in-vehicle system using the in-vehicle device according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 100 denotes an in-vehicle device according to the present invention having an electronic control unit (ECU) function, and the in-vehicle device 100 includes a wire harness including a feeder line L1, a communication line L2, and a power control signal line L3. L is connected. The power supply line L1 is connected to a power source such as a storage battery (not shown), and is used to supply power from the power source to the in-vehicle device 100. The communication line L2 is used for communication between the in-vehicle devices 100, 100,... Based on communication standards such as IEEE 1394 and CAN. The power control signal line L3 serves as a medium for transmitting a signal indicating High / Low from the branch connection device 200 called a junction box that transmits a signal in conjunction with the on / off of the ignition. The in-vehicle device 100 includes a communication control unit 110 that controls communication with the other in-vehicle devices 100, 100,... Connected to the wire harness L, and a processing unit 120 that has an electronic control unit function that executes electronic control processing related to the vehicle. It has. The processing units 120, 120,... Included in each of the in-vehicle devices 100, 100,... Are processings unique to each device such as a door lock system, a keyless entry system, an engine control module, and various AV (Audio and Visual) systems. It has a function to execute. The branch connection device 200 is a device used for branching and connection of the power control signal line L3. The branch connection device 200 is not only for branching and connection of the power control signal line L3 but also various functions such as a function of sending various signals as described above. It also has a function. Further, the branch connection device 200 may be used not only for the power control signal line L3 but also for branching and connection of the feeder line L1.

  The communication control unit 110 included in the in-vehicle device 100 transforms the power supplied from the connection unit 111 connected to the connector C included in the wire harness L and the power supply line L1 included in the wire harness L to the inside and the processing unit 120. Control of the power supply circuit 112 to be supplied, the communication LSI 113 that realizes functions corresponding to the data link layer and the physical layer in the OSI reference model by the power supplied from the power supply circuit 112, and the circuits inside the communication control unit 110 such as the communication LSI 113 And a control means 114 such as a communication microcomputer.

  The connection means 111 has a shape that can be connected to the connector C included in the wire harness L.

  The power supply circuit 112 converts the power of the voltage of 12V supplied from the power supply line L1 into a voltage at the time of operation such as 5V suitable for the processing unit 120, the communication LSI 113, and the control unit 114, and supplies the converted voltage. Note that the power supply circuit 112 can convert not only the voltage during operation and standby but also the voltage during disconnection, that is, 0V.

  The function corresponding to the data link layer included in the communication LSI 113 is, for example, dividing the communication information received from the processing unit 120 into frame sizes according to the communication standard of the connected communication line L2, and the communication line L2 2 shows a function of converting the information on the frame size received via the interface into information on a size that can be processed by the processing unit 120. The function corresponding to the physical layer included in the communication LSI 113 indicates a function of mutually converting information formed as a frame and an electric signal transmitted through the communication line L2.

  The communication control unit 110 is designed according to the standard of the in-vehicle LAN provided in the vehicle on which it is mounted, and performs communication processing according to the standard of the in-vehicle LAN. Further, the processing unit 120 executes each function unique to the apparatus. When designing the processing unit 120, it is not necessary to consider the standard of the in-vehicle LAN provided in the vehicle to be mounted, and by appropriately selecting the communication control unit 110 according to the in-vehicle LAN, the in-vehicle LAN of various communication standards. It is possible to connect to.

  Next, the process of the vehicle-mounted apparatus 100 in Embodiment 1 of this invention is demonstrated. FIG. 2 is a flowchart showing the processing of the in-vehicle device 100 according to Embodiment 1 of the present invention. When the ignition is turned on by a vehicle occupant, the power switching signal transmitted using the power control signal line L3 as a medium changes from Low to High. The in-vehicle device 100 receives the power switching signal via the power control signal line L3 included in the wire harness L (S101), and the received power switching signal is sent to the power supply circuit 112. The power supply circuit 112 receives the power switching signal. Based on the change, the voltage of the power supplied to the processing unit 120, the communication LSI 113, and the control unit 114 is switched (S102).

  When the change of the received power switching signal is Low to High, the power supplied from the power supply circuit 112 is switched from the off voltage to the on voltage, or the communication LSI 113 is switched from the standby mode to the operation mode. Note that when the change in the power switching signal is from High to Low, the change in the power supplied from the power supply circuit 112 is the reverse of the change from Low to High.

  FIG. 3 is a flowchart showing processing of the in-vehicle device 100 according to Embodiment 1 of the present invention. In the in-vehicle device 100 of the present invention, as described with reference to FIG. 2, not only the change of the signal received via the power control signal line L3 but also the switching of the power is performed by another signal. Here, switching of power by the first in-vehicle device 100 including the processing unit 120 that is a receiving circuit of the keyless entry system and the second in-vehicle device 100 including the processing unit 120 of the door lock system will be described. For convenience of explanation, the first in-vehicle device 100 including the processing unit 120 that is a receiving circuit of the keyless entry system is referred to as an in-vehicle device 100a, and the other in-vehicle device 100 is illustrated as the in-vehicle device 100b. Each internal circuit is also distinguished by adding a or b symbol.

  When the processing unit 120a included in the first in-vehicle device 100a receives a radio wave requesting door opening, the keyless ID included in the radio wave is collated, and when the validity of the keyless ID is authenticated, the communication control is performed. A predetermined signal is transmitted as a power switching signal to the control means 114a of the unit 110a (S201).

  The control means 114a of the first in-vehicle apparatus 100a receives the power switching signal (S202) and sends a power switching signal for requesting switching of the power supplied from the power circuit 112a to the power circuit 112a. The power supply circuit 112a switches the voltage of the power supplied to the processing unit 120a, the communication LSI 113a, and the control unit 114a based on the received power switching signal (S203).

  The control means 114a that has received the power switching signal in step S202 sends a predetermined signal to the communication LSI 113a, and the communication LSI 113a switches the predetermined signal to the second in-vehicle device 100b via the power control signal line L3. It transmits as a signal (S204).

  In the second in-vehicle device 100b, the communication LSI 113b receives the power switching signal via the power control signal line L3 (S205), sends the received power switching signal to the control unit 114b, and from the control unit 114b to the power supply circuit 112b. Then, a power switching signal for requesting switching of the power to be supplied is sent. The power supply circuit 112b switches the voltage of the power supplied to the processing unit 120b, the communication LSI 113b, and the control unit 114b based on the received power switching signal (S206). That is, the communication LSI 113b is switched from the standby mode to the operation mode. This activates the door lock system and unlocks the door. It should be noted that the door unlocking / locking in the door lock system is not only based on the power switching signal by the keyless entry system, but also depends on the ignition on / off and the vehicle running speed. It operates appropriately according to a power switching signal transmitted from the in-vehicle device 100 including the electronic control unit to be detected.

  As a method of transmitting the power switching signal from the first in-vehicle device 100a to the second in-vehicle device 100b, not only directly transmitting via the power control signal line L3 but also transmitting via the branch connection device 200. It may be. Next, a mode in which a power switching signal is transmitted via the branch connection device 200 will be described. FIG. 4 is a flowchart showing processing of the in-vehicle device 100 according to Embodiment 1 of the present invention. The processing until the first in-vehicle device 100a transmits the power switching signal to the power control signal line L3 is the same as the processing in steps S201 to S204 described with reference to FIG. To do.

  The power switching signal transmitted from the first in-vehicle device 100a onto the power control signal line L3 is not directly transmitted to the second in-vehicle device 100b by the same process as step S204 in FIG. Transmitted to the device 200.

  The branch connection device 200 receives the power switching signal via the power control signal line L3 (S301), and transmits the received power switching signal to the second in-vehicle device 100b via the power control signal line L3 (S302). ). In step S302, the branch connection device 200 may transmit the power switching signal to all the vehicle-mounted devices 100 connected to the power control signal line L3. However, the type of the first vehicle-mounted device 100a that is the transmission source may be used. Depending on the type of the power switching signal, the second in-vehicle device 100b to be the transmission destination of the power switching signal may be selected, and the power switching signal may be transmitted only to the selected second in-vehicle device 100b. .

  The subsequent processing in the second in-vehicle device 100b that receives the power switching signal is the same as the processing in steps S205 to S206 described with reference to FIG.

  As described above, the communication control unit 110 included in the in-vehicle device 100 of the present invention performs a process of switching the voltage of power to be supplied based on the power control signal line L3 or the power switching signal received from the processing unit 120.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing a configuration of an in-vehicle system using the communication device according to Embodiment 2 of the present invention. In the second embodiment, the function of the communication control unit 110 in the first embodiment is provided in an independent communication device 210. The communication device 210 according to the second embodiment of the present invention includes an in-vehicle electronic device 220 having an electronic control unit function for executing an electronic control process related to the vehicle and the wire harness L including the feeder line L1, the communication line L2, and the power control signal line L3. Connected to.

  The communication device 210 transforms the power supplied from the first connection means 211 connected to the connector C included in the wire harness L and the power supply line L included in the wire harness L, and supplies the power to the inside and the vehicle-mounted electronic device 220. A circuit 212, a communication LSI 213 that realizes functions corresponding to the data link layer and the physical layer in the OSI reference model by the power supplied from the power supply circuit 212, a communication microcomputer that controls the circuits in the communication device 210, etc. The control means 214 and the 2nd connection means 215 connected to the vehicle-mounted electronic device 220 are provided.

  In the communication device 210 of the present invention, the voltage of the power to be supplied is switched based on the power switching signal received from the power control signal line L3 or the in-vehicle electronic device 220, specifically, from the off voltage to the on voltage. Alternatively, the communication LSI 213 performs processing for switching from the standby mode to the operation mode.

Embodiment 3 FIG.
FIG. 6 is a block diagram showing a configuration of an in-vehicle system using the communication device according to Embodiment 3 of the present invention. The third embodiment is a configuration using the communication device 310 in which the communication device 210 and the wire harness L are integrated in the second embodiment. The communication device 310 according to the third embodiment of the present invention is integrated with the wire harness L including the power supply line L1, the communication line L2, and the power control signal line L3, and executes an electronic control process related to the vehicle. It is connected to the in-vehicle electronic device 320 having a function.

  The communication device 310 transforms the power supplied from the power supply line L included in the wire harness L and supplies the power to the internal and in-vehicle electronic device 320, and the power supplied from the power circuit 312 is used in the OSI reference model. A communication LSI 313 that realizes functions corresponding to the data link layer and the physical layer, a control unit 314 such as a communication microcomputer that controls circuits inside the communication device 310, and a connection unit 315 that connects to the in-vehicle electronic device 320 I have.

  In the communication device 310 of the present invention, the voltage of the power to be supplied is switched based on the power switching signal received from the power control signal line L3 or the in-vehicle electronic device 320, specifically, from the off voltage to the on voltage. Alternatively, the communication LSI 313 switches from the standby mode to the operation mode.

  In the above-described embodiment, a mode including one communication control unit (or one communication device) and one processing unit (or one on-vehicle electronic device) has been described, but the present invention is not limited to this, The communication control unit may be connected to a plurality of processing units, and the communication control unit may have different processing units for switching the power to be supplied according to the transmission source of the power switching signal. Similarly, the voltage of the power to be switched may be different depending on the transmission source of the power switching signal.

It is a block diagram which shows the structure of the vehicle-mounted system using the vehicle-mounted apparatus in Embodiment 1 of this invention. It is a flowchart which shows the process of the vehicle-mounted apparatus in Embodiment 1 of this invention. It is a flowchart which shows the process of the vehicle-mounted apparatus in Embodiment 1 of this invention. It is a flowchart which shows the process of the vehicle-mounted apparatus in Embodiment 1 of this invention. It is a block diagram which shows the structure of the vehicle-mounted system using the communication apparatus in Embodiment 2 of this invention. It is a block diagram which shows the structure of the vehicle-mounted system using the communication apparatus in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 In-vehicle apparatus 110 Communication control part 120 Processing part 112,212,312 Power supply circuit 210,310 Communication apparatus 220,320 In-vehicle electronic apparatus L Wire harness L1 Feeding line L2 Communication line L3 Power control signal line

Claims (7)

In the in-vehicle device connected to the feeder line,
A communication control unit that is supplied with electric power from the feeder line and controls communication with other devices mounted on the vehicle;
A processing unit that is connected to the communication control unit, and that performs electronic control processing related to the vehicle with electric power supplied from the communication control unit;
The communication control unit
A power supply circuit for supplying power supplied from a power supply line to the inside and the processing unit;
Receiving means for receiving a power switching signal for requesting switching of power supplied from the power supply circuit;
A vehicle-mounted device comprising: switching means for switching the power supplied from the power supply circuit based on the received power switching signal. The communication control unit
It should be connected to the power control signal line that becomes the medium of the power switching signal,
The in-vehicle device according to claim 1, wherein the receiving unit is configured to receive a power switching signal from a power control signal line. The processing unit includes means for transmitting a power switching signal to the communication control unit,
The in-vehicle device according to claim 1, wherein the receiving unit included in the communication control unit is configured to receive a power switching signal from the processing unit.   The in-vehicle device according to any one of claims 1 to 3, wherein the switching unit included in the communication control unit is configured to switch on / off of supplied power based on a power switching signal. .   5. The in-vehicle device according to claim 1, wherein the switching unit included in the communication control unit is configured to switch standby power / operating power based on a power switching signal. . In a communication device including a communication control unit that controls communication with other devices mounted on a vehicle,
Means for connecting to the feeder line;
Means for connecting to an in-vehicle electronic device for executing electronic control processing relating to the vehicle;
A power supply circuit for supplying electric power supplied from a power supply line to the in-vehicle electronic device connected internally and;
Means for receiving a power switching signal for requesting switching of power supplied from the power supply circuit;
Means for switching the power supplied from the power supply circuit based on the received power switching signal. In a communication device including a communication control unit that controls communication with other devices mounted on a vehicle,
A feed line connected to the power source;
Means for connecting to an in-vehicle electronic device for executing electronic control processing relating to the vehicle;
A power supply circuit that supplies power supplied from a power supply via a power supply line to the in-vehicle electronic device that is connected internally, and
Means for receiving a power switching signal for requesting switching of power supplied from the power supply circuit;
Means for switching the power supplied from the power supply circuit based on the received power switching signal.

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