JP3137356B2 - Multiplex transmission equipment for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission device for a vehicle provided with a keyless entry device for locking and unlocking a door based on a signal from a transmitter.

[0002]

2. Description of the Related Art In recent automobiles, the number of electronic devices mounted thereon has increased remarkably, and as a result, the problem of enlargement and complication of wiring connecting each electronic device has become noticeable. In order to solve such a problem, it has been studied to connect a plurality of multiplex communication nodes for electronic devices to a common transmission line and perform signal transmission between the communication nodes by multiplex transmission, and practical use has been started ( For example, see JP-A-61-224634).

On the other hand, some recent automobiles include a keyless entry device that locks and unlocks a door by a signal (radio wave) from a transmitter.

[0004]

By the way, electronic equipment mounted on an automobile is usually an ignition-on (IG-
ON) and then operated. Therefore, it is conceivable that the multiplex transmission apparatus is also system-up from the standby mode (dark current reduction mode) to the normal operation mode, that is, wake-up at the time of IG-ON.

[0005] However, some electronic devices, such as various lamps and horns, are mounted on an IG-O
There is a possibility that it may be operated even before N, and it is desired to operate even before IG-ON. Therefore, in the case of a multiplex transmission apparatus that also transmits signals related to such electronic devices, it is not enough to wake up at the time of IG-ON.

[0006] However, even the above-mentioned various lamps and horns do not always have to be operated at all times. For example, when the occupant gets off the car and stays away for a long time, it cannot be operated. . Therefore, as described above, the multiplex transmission apparatus which always wakes up and enters the normal operation mode is in a wake-up state even when there is no need to originally wake up, and continues to consume dark current. It is not preferred in terms of consumption.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to be able to keep a wake-up state in a situation where an operation may be required and to appropriately lower a system in a situation where an operation is not necessary, thereby consuming dark current. It is an object of the present invention to provide a multiplex transmission device for a vehicle which can be reduced in number.

[0008]

In order to achieve the above object, a vehicular multiplex transmission apparatus according to the present invention comprises a keyless entry device for locking and unlocking a door based on a signal from a transmitter. A multiplex transmission device for a vehicle provided in a vehicle, comprising: a plurality of multiplex communication nodes connected to a transmission line and performing multiplex transmission of a signal via the transmission line; and a door lock and door unlock by the keyless entry device. Detection means for detecting the output of the multiplex communication nodes upon receiving an output from the detection means to wake up the multiplex communication nodes when the door is unlocked, and to bring down the multiplex communication nodes when the door is locked; and If there is no input to any of the above-mentioned multiplex communication nodes within a predetermined time after the wake-up at the time of release, each of the above-mentioned multiplex communication nodes is system-switched. And start-up control means for Mudaun,
It is characterized by comprising.

[0009]

After the door is locked by the keyless entry device and before the door is unlocked by the keyless entry device, the occupant is completely away from the car, and there is no possibility that the various lamps and horns are operated, and other electronic devices are not operated. There is basically no need to perform signal transmission with a multiplex transmission device, and the operation of the multiplex transmission device is required only after the door is unlocked by the keyless entry device until the door is locked by the keyless entry device. Can be said to be between.

Therefore, according to the above-described vehicle multiplex transmission device which is woken up when the door is unlocked by the keyless entry device and the system is shut down when the door is locked by the keyless entry device, the wake-up state is set in a situation where operation can be required. While you can
In a situation where operation cannot be required, the system will go down,
By doing so, the consumption of dark current can be effectively reduced.

After the door is unlocked by the keyless entry device, the driver enters the vehicle within a predetermined time and operates switches of various lamps or turns on the IG-ON to input any signal to the multiplex transmission device. Is normal, and if there is no input within a predetermined time, it is considered that the door is unlocked but the car is not driven and the multiplex transmission device does not need to operate. A typical example of such a case is when the door is unlocked with a keyless entry device, the use in the vehicle interior is completed, for example, luggage in the vehicle interior is removed, and then the door is locked with a key and the vehicle is separated from the car Can be mentioned.

However, in the multiplex transmission apparatus, even if the wake-up is performed when the door is unlocked by the keyless entry apparatus, if there is no input to any node within a predetermined time, the system of each node is brought down. With this configuration, it is possible to appropriately cope with the above-described case, and in this regard, it is possible to effectively reduce the consumption of dark current.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. The embodiment described below is an example in which the present invention is applied to a vehicle multiplex transmission apparatus that employs a network access method called a so-called CSMA / CD-AMP system. Here, CSMA (Carrier Sense M
ultiple Access) means a method in which each communication node performs transmission by confirming the availability of a transmission path when a transmission request occurs.
CD (Collision Detection) refers to a method in which each communication node monitors a transmission signal on a transmission line and performs retransmission control when a signal collision is detected.
Age Priority) means a method in which a high priority message is transmitted as it is without breaking at the time of signal collision.

<Overview of Multiplexing Transmission Apparatus> FIG. 1 shows an embodiment of the present invention. The illustrated device includes a common transmission line (bus) 2 composed of a twisted pair line, and a plurality of multiplex communication nodes 4, 6, 8 connected to the transmission line 2. Although not shown, the transmission line 2 is formed in a loop shape, and another multiplex communication node (not shown) can be connected to the transmission line 2 as appropriate.

The multiplex communication nodes 4, 6, and 8 are a TWS (Total Wiring System) node, a front load node, and a switch node, respectively. The TWS node 4 is for supplying power to other nodes and for connecting a test device for diagnosing an accident. The front node 6 is a node for a lamp or the like around the front, and the node 6 is connected to a headlamp 22, a front turn right signal lamp, a front turn left signal lamp, and a horn (not shown). The switch node 8 is a node for operating switches around the steering wheel. The node 8 is connected to a headlamp switch 24, a turn light switch, a turn left switch, a horn switch, and the like (not shown).

The multiplex communication nodes 4, 6, and 8 are connected to multiplex communication ICs 4a, 6a, and 8a for controlling multiplex communication, and loads such as various sensors, switches, and actuators. It receives signals and outputs control signals to them, and the multiplex communication ICs 4a, 6a, 8a
Control units 4b, 6b, and 8b for transmitting and receiving signals to and from other nodes via
b, 6b, and 8b provided in respective nodes 4, 6, 8
And activation control means 4c, 6c, 8c for waking up the system and bringing the system down.

<Keyless Entry Device> The multiplex transmission device is provided together with the keyless entry device 10. The keyless entry device 10 locks and unlocks the door of an automobile according to a door lock signal and a door lock release signal transmitted from a transmitter (transmitter) 12, and receives a radio signal from the transmitter 12. A keyless entry control unit 14 having a receiving unit 14a for outputting a keyless entry door lock signal or a keyless entry door lock release signal in the form of an electric signal based on the received signal, and responding to the signal output from the control unit 14 Control unit 16 that controls the actuator 18 of the door lock mechanism
And comprising.

In the present embodiment, the actuator 18 of the door lock mechanism is connected to the TWS node 4, and the control unit 16 for controlling the actuator 18 uses the TW
It is composed of an S node control unit 4b. The signal output from the keyless entry control unit 14 is input to the control unit 4b (16) of the TWS node.

<Wake Up and System Down>
◆ The multiplex transmission device wakes up and shuts down the system in conjunction with door lock release and door lock by the keyless entry device. Here, the wakeup means that the multiplex transmission device is upgraded from the standby mode (dark current reduction mode) to the normal operation mode.
In other words, it means that the power is turned on to bring the apparatus into a state in which normal operation is possible, and the term "system down" means that the normal operation mode is changed to the standby mode. Wake-up and system down of a multiplex transmission device means that all multiplex communication nodes or a part of target multiplex communication nodes are wake-up and system down uniformly.

First, the system upgrade will be described.
In the present embodiment, all the multiplex communication nodes 4, 6, 8
Are provided with activation control means 4c, 6c, and 8c. The activation control means 4c, 6c, and 8c are provided from a keyless entry control unit 14 also serving as a detection means for detecting door lock and door unlock by the keyless entry device 10. Each node is woken up by the keyless entry door lock release signal.

That is, when the door lock release signal is transmitted from the transmitter 12, the keyless entry control unit
14 receives the signal and outputs a keyless entry door unlock signal, and this signal is input to the control unit 4b of the TWS node, and the activation control means 4c in the control unit 4b sends the keyless entry door unlock signal to the keyless entry door unlock signal. At the same time, the TWS node 4 is woken up, and the control unit 4b operates the actuator 18 to release the door lock, and outputs a keyless entry door unlock signal to other nodes via the multiplex communication IC 4a.

The keyless entry door unlock signal output from the TWS node 4 is input to all other nodes, ie, the control units 6b and 8b of the front node 6 and the switch node 8, and the start control of the control units 6b and 8b is performed. Means 6c and 8c are connected to respective nodes 6 and 8 based on the keyless entry door unlock signal.
Wake up.

When a door lock signal is transmitted from the transmitter 12, the keyless entry control unit
14 receives the signal and outputs a keyless entry door lock signal, which is input to the control unit 4b of the TWS node, and the control unit 4b operates to lock the actuator 18 based on the signal. At the same time, a keyless entry door lock signal is output to another node via the multiplex communication IC 4a, and the activation control means 4c shuts down the TWS node 4 based on the signal.

The keyless entry door lock signal output from the TWS node 4 is input to the control units 6b and 8b of all other nodes, ie, the front node 6 and the switch node 8, and the control unit 6b
The activation control means 6c and 8c of b and 8b respectively bring down the nodes 6 and 8 based on the keyless entry door lock signal.

Each of the nodes 4, 6, 8 determines whether there is any input to its own node within a predetermined time after the wake-up based on the keyless entry door unlock signal by the control units 4b, 6b, 8b. The system is monitored, and if there is no input, the system goes down by the activation control means 4c, 6c, 8c. For example, when the light switch 20c is turned on within the predetermined time, the light switch-on signal is input to the switch node 8, the switch-on signal is transmitted from the switch node 8 to the transmission line 2, and the TWS node 4 and the front node 6, and the front node 6 turns on the headlamp 22 based on the switch-on signal. Therefore, in such a case, there is an input to each of the nodes 4, 6, 8 within a predetermined time, and the wake-up is continued as it is. For example, when IG-ON is performed within a predetermined time, the IG-ON
Although not shown, a signal is input to the TWS node 4, and the IG-ON signal is input from the TWS node 4 to the front node 6 and the switch node 8 via the transmission line 2, and each of the nodes 4, 6, 8 Keep wake up.
Then, if the IG-ON is not performed within a predetermined time and the various switches are not operated, and there is no input to any of the other nodes, each of the nodes notifies the control unit 4b, 6b, Judgment is made in 8b, and the system is shut down by the activation control means 4c, 6c, 8c.

After the door is locked by the keyless entry device 10 and before the door is unlocked by the keyless entry device 10, the occupant is completely away from the automobile, and switches are operated to transmit and receive signals by the multiplex transmission device. It can be said that the operation of the multiplex transmission device is required only after the door is unlocked by the keyless entry device 10 until the door is locked by the keyless entry device 10.

Therefore, as described above, the keyless entry device
If the system is configured to wake up when the door lock is released by 10 and to shut down the system when the door is locked by the keyless entry device 10, it is possible to keep the wake-up state at all times in the situation where the operation can be required, and to require the operation. If this is not possible, the system can be shut down, thereby effectively reducing the consumption of dark current.

After the door is unlocked by the keyless entry device 10, a driver enters the vehicle within a predetermined time and operates switches of various lamps or turns on the IG-ON to input some signal to the multiplex transmission device. Normally, when there is no input within a predetermined time, for example, when the door is unlocked with the keyless entry device 10 and the luggage in the vehicle compartment is taken out, then the door is locked with the key and the vehicle is separated from the car In addition, it is considered that the vehicle is not driven even though the door is unlocked, and the multiplex transmission device does not need to operate.

However, the multiplex transmission apparatus is configured such that even if the wake-up is performed when the keyless entry apparatus 10 releases the door lock, the system is shut down if there is no input within a predetermined time after that.
The above case can be appropriately dealt with, and in this regard, the consumption of dark current can be effectively reduced.

The multiplex transmission apparatus according to the present invention is not limited to the wake-up and system down systems linked with the keyless entry device. It is also possible to combine, for example, a method of interlocking with the keyless entry device and a method of bringing up the system when the IG-ON is turned on in the standby mode, so that, for example, the door is unlocked by the keyless entry device. Does not operate for a long time for some reason, and the multiplex transmission apparatus is shut down due to the lapse of the above-mentioned predetermined time.
Also in this case, the multiplex transmission device can be appropriately woken up.

[0031]

As described above, the multiplex transmission system for a vehicle according to the present invention wakes up and shuts down the system in conjunction with the door lock release and door lock by the keyless entry device as described above. The wake-up state can be maintained, and the system can be properly shut down in a situation where operation is unnecessary, thereby effectively reducing the consumption of dark current.

If there is no input within a predetermined time after the wake-up linked to the keyless entry device, the system is shut down. For example, the door lock is released by the keyless entry device, but the car is not driven for some reason. In this case, it is possible to appropriately cope with such a case, and it is possible to more effectively reduce the consumption of dark current.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a vehicle multiplex transmission apparatus according to the present invention.

[Explanation of symbols]

 2 Transmission path 4,6,8 Multiple communication node 4c, 6c, 8c Activation control means 10 Keyless entry device 14 Detection means

Claims (1)

(57) [Claims] 1. A vehicular multiplex transmission device provided in a vehicle provided with a keyless entry device for locking and unlocking a door based on a signal from a transmitter, wherein the multiplex transmission device is connected to a transmission line and is connected to the transmission line. A plurality of multiplex communication nodes for performing multiplex transmission of signals, detecting means for detecting door lock and door unlocking by the keyless entry device, and receiving the output from the detecting means to perform each of the multiplex communication at the time of unlocking the door. Wake up the node,
When the door is locked, the respective multiplex communication nodes are brought down, and when there is no input to any of the multiplex communication nodes within a predetermined time after the wake-up when the door is unlocked, the system is brought down. A multiplex transmission device for a vehicle, comprising: activation control means.