JPH10210040A - On-vehicle radio multiple communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify writing between controllers for controlling an electric equipment in a vehicle by supplying a power for driving a radio equipment from one radio equipment to the other. SOLUTION: A radio equipment 3 is provided at an engine control ECU 2, and a radio equipment 4 for operating communication with the radio equipment 3 is provided in wiring 1 at a front panel side at the opposite side of a partition. Communication is operated between the radio equipment 3 and 4 by electromagnetic waves transmitted through the partition. Moreover, a transponder technique is used. Each radio equipment 3 and 4 is provided with a microcomputer, high frequency(RF) module, and power source circuit. When communication is operated from the radio equipment 4 to the radio equipment 3, a signal for supplying a power(generating a constant electromagnetic field) is outputted from the radio equipment 4 to the radio equipment 3. The radio equipment 3 converts a signal received by an antenna in the electromagnetic field prepared by the radio equipment 4 into a power by the power source circuit, and uses it for the operating power of the microcomputer and a high frequency module.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex communication device between electronic devices mounted on a vehicle, and more particularly to a vehicle-mounted wireless multiplex communication device for reducing wiring.

[0002]

2. Description of the Related Art FIG. 8 is a view for explaining an example of a conventional on-board multiplex communication device using a local area network (LAN). As shown in the figure, in the engine room of the vehicle, a right front light ECU (electronic control device) for a headlight, a left front light ECU, and a radar ECU for radar are electronic devices.
The front panel has an audio ECU for audio, an air conditioner ECU for air conditioning,
An engine control ECU for engine control is provided, and a door and a seat portion include a front right door ECU for a front right door, a front left door ECU for a front left door, and a rear right door EC for a rear right door.
U, left rear door ECU for left rear door, CD on rear
(Compact disc) A CD changer ECU for a changer and a navigation (NAVI) ECU for navigation are provided. The body ECUs include a right front light ECU and a left front light ECU, a right front door ECU, a left front door ECU, a right rear door ECU, and a left rear ECU. Overall control of the rear door ECU. Each ECU
Has a communication function. The ECUs are connected by a local network, and the local network is configured by wiring including an AV (audio / visual) line, a twisted pair line, an optical fiber, and the like. Local networks are used especially in luxury car classes.

In a multiplex communication system between ECUs, a wiring harness between an engine room and a front panel is required, so that wiring and assembly work are complicated. Furthermore, since wiring is necessary for the entire vehicle from the front to the rear, the wiring and the assembly work are similarly complicated. In addition, it is difficult to respond to options for retrofitting electronic devices. FIG. 9 is a diagram illustrating another example of a conventional in-vehicle multiplex communication device. As shown in the figure, the body ECU is connected to the front right lighting ECU, the front left lighting ECU, the air conditioner ECU, the front right door ECU, the front left door ECU, the rear right door ECU, the rear left door ECU, and the normal wiring including body wiring. . Audio EC
The U, the CD changer ECU, and the navigation ECU are connected by normal wiring composed of AV wiring. Engine control EC
The U and the radar ECU are connected by normal wiring composed of engine control system wiring. A multiplex communication system is configured in the general vehicle class using these normal wirings.

In such a multiplex communication system, wiring is crowded and it is difficult to understand. Furthermore, a through harness between the engine room and the front panel is required. Wiring is required throughout the vehicle from front to rear. It is necessary to peel off the sheet for mounting the retrofit option of the electronic device.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an in-vehicle multiplex communication apparatus capable of simplifying wiring between electronic control units for controlling electric devices in a vehicle in view of the above problems. I do.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a vehicle-mounted multiplex communication device for performing multiplex communication between electronic control devices for controlling electric equipment in a vehicle. A wireless device for performing multiplex communication between devices is provided, and power for driving the wireless device is supplied from one of the wireless devices to the other. By this means, the wiring can be simplified.

[0007] In order to perform multiplex communication between an electronic control unit located in the engine room and an electronic control unit located outside the engine room, the radio is provided on both sides of a threshold separating the inside and outside of the engine room. Can be By this means, the electromagnetic wave output from the wireless device penetrates the threshold, so that wiring penetrating the threshold can be eliminated. In order to perform multiplex communication between electronic control units located in front and rear of the vehicle interior, the wireless device is provided before and after the interior of the vehicle interior. By this means, the wiring on the ceiling of the vehicle, which has conventionally been provided, can be eliminated.

In order to perform multiplex communication between the electronic control unit located on the vehicle body and the electronic control unit located on the door, the radio is provided on both sides of the vehicle body and the door. The wiring between the door and the main body can be eliminated, and the step of passing the wiring through the holes of the connecting portions can be eliminated. One of the local area network harness and wire harness
In order to perform multiplex communication between an electronic control device located in the engine room and an electronic control device located outside the engine room among the plurality of electronic control devices connected by the In order to multiplex communication between electronic control units located in the front and rear of the vehicle interior, the radio is provided in front and rear of the vehicle interior, and further provided in the front and rear of the vehicle interior. In order to perform multiplex communication between the electronic control unit located at the door and the electronic control unit located at the door, the radio is provided on both sides of the vehicle body and the door. By this means, luxury car class,
Wiring can be simplified even in a general car class.

The wireless device is provided between electronic control units that perform multiplex communication with a high transmission rate. By this means,
Wiring of audio equipment or the like that does not require reliability for safety can be simplified, and wireless communication can be realized most. The wireless device is provided between electronic control devices that perform multiplex communication with a low transmission rate. By this means, it can be realized limited to the range of the electronic control device of the body system.

[0010] The wireless device is provided for multiplex communication with an electronic control device of an electronic device to be retrofitted, with the entire vehicle as a radio wave range. By this means, it is easy to retrofit by purchasing the audio by the user, and a flexible response is possible. The wireless device is provided for multiplex communication with an electronic control device of an electronic device to be retrofitted, with the vicinity of the front panel of the vehicle as a radio wave range, and further, is retrofitted as a radio wave range near the rear portion of the vehicle. It is provided for multiplex communication with an electronic control device of an electronic device, and further provided for multiplex communication with an electronic control device of an electronic device to be attached later, with a vicinity of an engine room of a vehicle as a radio range. By using this method, if radio waves that cover the entire vehicle are used, there is a concern that the effects of noise, etc. on other devices may be concerned.Therefore, by using weak radio waves, the area is limited to minimize the effects on other devices. It is possible to keep it to a minimum.

[0011] Of the plurality of electronic control units connected by one of a local area network wiring and a normal wiring, the wireless device is used for an electronic device to be retrofitted with the vicinity of the front panel of the vehicle as a radio wave range. It is provided for multiplex communication with the electronic control device, and further provided for multiplex communication with the electronic control device of the electronic equipment to be retrofitted, with the vicinity of the front panel of the vehicle as a radio wave range, Near the radio wave range,
It is provided for multiplex communication with an electronic control device of an electronic device to be retrofitted. By this means, the influence of noise on retrofitting can be reduced even in a luxury car class and a general car class.

The wireless device performs multiplex communication between all electronic control units of the vehicle. By this means, the wiring in the vehicle can be completely eliminated.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining a first example of an in-vehicle wireless multiplex communication device according to the present invention. In the conventional example as shown in FIG. 1A, for example, the wiring 1 is connected to an engine control ECU 2 in an engine room, penetrates a threshold separating the engine room and the front panel side, and is connected to another ECU. Is done. On the other hand, as shown in FIG. 1B, in the in-vehicle wireless multiplex communication device of the present invention, the wireless device 3 is provided in the engine control ECU 2 and the wiring 1 on the front panel side opposite to the threshold is provided on the wiring 1. A wireless device 4 for communicating with the wireless device 3 is provided. Since communication is performed between the wireless devices 3 and 4 using electromagnetic waves that pass through the threshold, there is no need to provide a through-hole in the threshold, and furthermore, wiring,
No assembly work is required.

[0014] Furthermore, simply providing wireless communication requires a power supply line for a wireless device, but the use of transponder technology as described below enables complete wireless communication. FIG. 2 is a diagram illustrating an example in which the transponder technique is used for the wireless device of FIG. As shown in this figure, each of the wireless devices 3 and 4 has a microcomputer (hereinafter referred to as a microcomputer), a radio frequency (RF) module, and a power supply circuit. For example, a case where the wireless device 4 supplies power to the wireless device 3 will be described. First, when communication is performed from the wireless device 4 to the wireless device 3, the wireless device 4 outputs a power supply signal (which generates a constant electromagnetic field) to the wireless device 3. The wireless device 3 converts a signal received by an antenna in an electromagnetic field generated by the wireless device 4 into electric power by a power supply circuit,
The operating power of the high-frequency module. When a certain level or more of power (sufficient power for the microcomputer and the high-frequency module) is secured, a signal indicating that the transceiver 4 has entered the transmission / reception enabled state is output. Upon receiving the transmission / reception enable signal of the wireless device 3, the wireless device 4 converts the data signal sent from another ECU via the wiring 1 to serial / parallel by a microcomputer, and performs phase modulation and the like by a high frequency module to perform an antenna. An electromagnetic wave is output through the device. In the wireless device 3, a signal whose electromagnetic wave is received by an antenna and subjected to phase modulation is separated into power for operating a high-frequency module, a microcomputer, and the like by passing through a power supply circuit, and power for converting the signal into a data signal. Data obtained by demodulating the phase-modulated signal thus obtained by the high-frequency module is parallel-to-serial-converted by the microcomputer and converted into a data signal.

When the wireless device 3 responds to the wireless device 4, the wireless device 4 keeps the state of outputting the power supply signal when receiving the signal indicating that the wireless device 3 is ready for transmission and reception. The wireless device 3 modulates the data signal from the engine control ECU 2 into a transmission signal as described above and outputs the signal. In the wireless device 4, the received signal is converted into a data signal as described above.

Note that a signal for power supply may be constantly output from the wireless device 4 to the wireless device 3 so that the wireless device 4 can output a data signal to the wireless device 3 as needed. FIG. 3 is a diagram illustrating a format of data transmitted by each ECU. As shown in the drawing, data transmitted from each ECU has a transmission source and a transmission destination. Each ECU that has received the data signal checks the transmission destination address and outputs a signal to the actuator of the electric device if the address matches with its own. If not, do nothing.

FIG. 4 is a view for explaining a second example of the vehicle-mounted radio multiplex communication apparatus according to the present invention. As shown in FIG. 1A, in a conventional example, for example, an audio ECU 5 on a front panel and a CD changer 6 on a rear portion are connected via a wiring 1. The wiring 1 is a wiring that has long entered through the ceiling or the like in the vehicle. On the other hand, as shown in FIG. 2B, in the in-vehicle wireless multiplex communication device of the present invention, the radio 3 is provided in the audio ECU 5, and the radio 4 for communicating with the radio 3 is the CD changer 6. Is provided. In this way, by making the communication between the electronic control devices in front of and behind the vehicle wireless, it is possible to eliminate wiring and assembly work between them.

Note that the wireless communication between the audio ECU 5 and the CD changer ECU 6 is not so important in terms of safety as compared with other ECUs. It is highly feasible. In the case of audio equipment, the preferences differ depending on the user, and it is often necessary to change the manufacturer and product number. By using wireless communication, it is possible to flexibly respond to those user requests. However, in the case of wireless communication using audio equipment, signals such as video and audio need to be transmitted at high speed, and a transmission speed of at least 1 Mbps is required.

FIG. 5 is a diagram for explaining a third example of the vehicle-mounted radio multiplex communication apparatus according to the present invention. As shown in FIG. 1A, in a conventional example, for example, a body ECU 7 in a vehicle body and a door ECU 8 in a door are connected via a wiring 1. It is necessary to make a hole in the connection between the body and the door, and this wiring 1 is a complicated wiring. The door ECU 8 controls a system such as a door lock and a power window. On the other hand, as shown in FIG. 2B, in the on-vehicle wireless multiplex communication device of the present invention, the wireless device 3 of the body ECU 7 is provided, and the wireless device 4 communicating with the wireless device 3 is replaced by the door ECU 8. Is provided. Thus, the body ECU 7 and the door ECU 8
Wiring and assembly work can be eliminated by making the communication between the devices wireless. If limited to this case, the transmission speed can be realized at a low speed of about several tens of kbps. Note that, similarly, wireless communication may be performed between the body ECU 7 and the lighting ECU.

It should be noted that, among a plurality of electronic control units connected by one of the local area network wiring and the normal wiring, the electronic control units shown in the examples of FIGS. This is for the purpose of wireless communication in a luxury car class and a general car class. FIG. 6 is a diagram for explaining a fourth example of the vehicle-mounted wireless multiplex communication device according to the present invention. As shown in FIG. 1A, in the conventional example, for example, the wiring 1 is connected between the audio ECU 5 and the CD changer 6. You need to prepare a vacant terminal. On the other hand, as shown in FIG. 3B, in the in-vehicle wireless multiplex communication device of the present invention, the radio device 9 is previously installed in the vehicle as a measure when the circuit for the option is not available and when it is not possible to cope with something other than the schedule. Is provided on the wiring 1. In this way, the option EC with the radio 11
No matter where the U10 is provided in the vehicle, the wireless device 9 and the wireless device 11 can communicate. For this reason, options can be easily handled. Next, in order to support a plurality of options, for example, as shown in FIG. In this way, the radio 11
Even if the optional ECU 10A with A and the optional ECU 10B with the radio 11B are provided in the vehicle, communication between the radio 9A and the radio 11A, the radio 9B and the radio 11
Communication with B becomes locally possible.

In order to cope with a plurality of options, a radio device may be provided with the vicinity of the engine room, the front panel, and the rear portion as a radio wave range.
If radio waves that cover the entire vehicle are used, there is a concern that noise and other influences may be applied to other devices.Therefore, by using weak radio waves to limit the area, it is possible to minimize the effects on other devices. Become.

[0022] Also, among a plurality of electronic control units connected by one of a local area network wiring and a normal wiring, a wireless device is provided with a radio wave range near an engine room, a front panel, and a rear part. It may be. This is for the purpose of wireless communication in a luxury car class and a general car class. FIG. 7 is a diagram illustrating a fifth example of the vehicle-mounted wireless multiplex communication device according to the present invention. As shown in FIG. 7 (a), all ECUs used in the vehicle-mounted wireless multiplex communication device
7B, a radio may be attached, and further, as shown in FIG. 7B, the body ECU may be used as a parent, the other ECUs may be used as children, and the parent may wirelessly supply power to each child. . In this way, the wiring can be completely simplified.

The engine room, front panel,
Parent and child radios may be provided in each of the door, seat, and rear areas. This is to make power transmission more efficient.

[0024]

As described above, according to the present invention, wiring between ECUs for controlling electric devices in a vehicle can be simplified.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first example of an in-vehicle wireless multiplex communication device according to the present invention.

FIG. 2 is a diagram illustrating an example in which a transponder technique is used for the wireless device of FIG. 1;

FIG. 3 is a diagram illustrating a format of data transmitted by each ECU.

FIG. 4 is a diagram illustrating a second example of the in-vehicle wireless multiplex communication device according to the present invention.

FIG. 5 is a diagram illustrating a third example of the in-vehicle wireless multiplex communication device according to the present invention.

FIG. 6 is a diagram illustrating a fourth example of the vehicle-mounted wireless multiplex communication device according to the present invention.

FIG. 7 is a diagram illustrating a fifth example of the vehicle-mounted wireless multiplex communication device according to the present invention.

FIG. 8 shows a conventional local area network (LAN)
FIG. 2 is a diagram for explaining an example of a vehicle-mounted communication multiplexing device using the CDMA.

FIG. 9 is a diagram illustrating another example of a conventional in-vehicle communication multiplexing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wiring 2, 5, 6, 7, 8, 10A, 10B, 20 ... Electronic control device 3, 4, 9, 9A, 9B, 11A, 11B ... Radio

Claims (17)

[Claims] 1. An in-vehicle multiplex communication device that performs multiplex communication between electronic control devices that control electric devices in a vehicle, comprising: a wireless device that performs multiplex communication between the electronic control devices; An in-vehicle wireless multiplex communication device for supplying power for driving a wireless device from one of the devices to the other. 2. In order to perform multiplex communication between an electronic control unit located inside the engine room and an electronic control unit located outside the engine room, the wireless device is provided on both sides of a threshold separating the inside and outside of the engine room. The in-vehicle wireless multiplex communication device according to claim 1, wherein the wireless multiplex communication device is mounted on a vehicle. 3. The in-vehicle wireless device according to claim 1, wherein the wireless device is provided before and after in the vehicle compartment to perform multiplex communication between electronic control devices located in front and behind the vehicle compartment. Multiplex communication device. 4. In order to perform multiplex communication between an electronic control device located on a vehicle body and an electronic control device located on a door, the wireless device is provided on both sides of the vehicle body and the door. The in-vehicle wireless multiplex communication device according to claim 1, wherein: 5. An electronic control unit located in an engine room and an electronic control unit located outside an engine room among a plurality of electronic control units connected by one of a local area network wiring and a normal wiring. 2. The in-vehicle wireless multiplex communication device according to claim 1, wherein the wireless device is provided on both sides of a threshold for isolating the inside and outside of the engine room so as to perform multiplex communication with the vehicle. 6. The wireless communication system for performing multiplex communication between electronic control devices located at the front and rear in a vehicle cabin among a plurality of electronic control devices connected by one of a local area network wiring and a normal wiring. The in-vehicle wireless multiplex communication device according to claim 1, wherein the devices are provided before and after in a vehicle cabin. 7. An electronic control unit located on a vehicle body and an electronic control unit located on a door among a plurality of electronic control units connected by one of a local area network wiring and a normal wiring. The in-vehicle wireless multiplex communication device according to claim 1, wherein the wireless device is provided on both sides of a vehicle body and a door to perform multiplex communication. 8. The in-vehicle wireless multiplex communication device according to claim 1, wherein the wireless device is provided between electronic control devices that perform multiplex communication with a high transmission rate. 9. The in-vehicle wireless multiplex communication device according to claim 1, wherein the wireless device is provided between electronic control devices that perform multiplex communication with a low transmission rate. 10. The in-vehicle wireless multiplexing device according to claim 1, wherein the wireless device is provided for multiplex communication with an electronic control device of an electronic device to be retrofitted, with the entire vehicle as a radio wave range. Communication device. 11. The wireless device according to claim 1, wherein the wireless device is provided for multiplex communication with an electronic control device of an electronic device to be retrofitted, with a vicinity of a front panel of the vehicle as a radio wave range. In-vehicle wireless multiplex communication device. 12. The wireless communication device according to claim 1, wherein the wireless device is provided for multiplex communication with an electronic control device of an electronic device to be retrofitted, with a vicinity of a rear portion of the vehicle as a radio wave range. In-vehicle wireless multiplex communication device. 13. The wireless device according to claim 1, wherein the wireless device is provided for multiplex communication with an electronic control device of an electronic device to be retrofitted, with a vicinity of an engine room of the vehicle as a radio wave range. In-vehicle wireless multiplex communication device. 14. A plurality of electronic control units connected by one of a local area network wiring and a normal wiring, wherein the wireless device is retrofitted with an electric wave range near a vehicle front panel. The in-vehicle wireless multiplex communication device according to claim 1, wherein the multiplex communication device is provided for multiplex communication with an electronic control device of a device. 15. The wireless device of the electronic control units connected by one of a local area network wiring and a normal wiring, wherein the wireless device is installed later in the vicinity of a front panel of the vehicle as a radio wave range. The in-vehicle wireless multiplex communication device according to claim 1, wherein the multiplex communication device is provided for multiplex communication with an electronic control device of a device. 16. A plurality of electronic control units connected by one of a wiring of a local area network and a normal wiring, wherein the radio is retrofitted with an electric wave range near an engine room of a vehicle. The in-vehicle wireless multiplex communication device according to claim 1, wherein the multiplex communication device is provided for multiplex communication with an electronic control device of a device. 17. The in-vehicle wireless multiplex communication device according to claim 1, wherein the wireless device performs multiplex communication between all the electronic control devices of the vehicle.