JPH04342632A - Local area network device for vehicle - Google Patents

Abstract

PURPOSE:To put ON an another normal lamp in substitution when a wire breakage trouble occurs in a vehicle lamp, by utilizing the decoder means of a local area network device, in order to secure the operation of a load having the high importance degree related to the safe traveling and dispose of the trouble of the load itself, in particular to the wire breakage trouble of the vehicle lamp, even if the trouble occurs in the local area network device. CONSTITUTION:A switching 6 connected with a prescribed local unit 3 is connected with the driving means 32 of other local unit 3. A load 4 is constituted of a plurality of vehicle lamps, and a detection sensor 5 for vehicle is connected with the vehicle lamp, and a wire breakage detection output supplied from the sensor 5 is connected with a decoder means 31.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is a vehicle local area network (LOCAL AREA) that controls various loads mounted on a vehicle using a shared transmission path.
NETWORK (abbreviation: LAN) device improvement.

0002

2. Description of the Related Art A local area network is generally known as a network in which terminal devices and computers are connected via a shared transmission path. This local
Area networks had the characteristic that local units could be added and removed at will. Moreover, when the local area network is adopted in a vehicle, it is possible to reduce the number of harnesses and thus contribute to the weight reduction of the vehicle. Conventionally, this type of technology has been used, for example.
Utility Model Application Publication No. 59-73863 and Japanese Patent Application Publication No. 1974-1974
It is disclosed in Publication No. 4.

0003

[Problem to be Solved by the Invention] However, when the loads to be controlled using a local area network include loads of high importance related to safe driving, such as lamps such as headlights and wiper devices, Failure of the local area network could be catastrophic. Furthermore, failure of the load itself also poses an obstacle to safe driving, and it is necessary to take some countermeasures.

0004

[Means for Solving the Problems] The present invention includes a shared transmission path, a main control unit that sends an encoded command signal to the shared transmission path, and a shared transmission path that transmits the encoded command signal from the main control unit. a local unit having a decoder means for receiving and decoding the load signal and outputting a corresponding load signal, and a drive means for outputting a drive signal in response to the load signal from the decoder means; and a load connected to the drive means of the local unit. In order to solve the above problems in a vehicle local area network device equipped with a vehicle local area network device, the following technology is provided.

[0005] That is, the first invention aims to ensure the operation of loads that are highly important for safe driving even if a failure occurs in the local area network device. A local area network device for a vehicle is provided, characterized in that a switch is connected to driving means of another local unit.

[0006] Furthermore, the second invention is a failure of the load itself;
In particular, in order to deal with disconnection failures in vehicle lamps, when a disconnection failure occurs in vehicle lamps, the load is switched on with the aim of using the decoder means of the local area network device to turn on other normal lamps as an alternative. A local area device for a vehicle comprising a plurality of vehicle lamps, a sensor for detecting disconnection is connected to the vehicle lamp, and a disconnection detection output from the sensor is connected to a decoder means.
Provide network equipment.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an electrical circuit diagram showing a preferred embodiment of the present invention, and FIG. 2 is a block diagram. First, an overview of the vehicle local area network device according to the present invention will be explained based on FIG. In the figure, 1 is a shared transmission line, 2 is a main control unit that sends an encoding command signal to the shared transmission line 1, and 3 is a unit that transmits an encoding command signal from the main control unit 2 from the shared transmission line 1. a decoder means 31 for receiving and decoding the load signal and outputting a corresponding load signal;
, and a local unit having a driving means 32 for outputting a driving signal in response to a load signal from the decoder means 31, and 4 is a load connected to the driving means 32 of the local unit 3. Furthermore, 5 is a sensor, and 6 is a switch.

Next, details will be explained based on FIG. 1. The shared transmission line 1 is a signal line made of a conductive wire or an optical fiber, and is wired from the front to the rear of the vehicle, and connects the main control unit 2 and the local unit 3. The main control unit 2 is the central part of the apparatus and controls signal transmission between the local units 3. Further, the local unit 3 is a terminal section of the device, and has the decoder means 31 and the drive means 32 as described above. This decoder means 31 can use a communication IC equipped with an I/O port, an encoder, a decoder, and the like. Further, the decoder means 31 has an input end I1 connected to the shared transmission path 1, input ends I2 and I3 connected to a sensor 5 to be described later, and output ends O1, O2 and O3 connected to the drive means 32. . This driving means 32 is configured by connecting FETs 32a to 32d and resistors 32e to 32k.

In addition to the above configuration, the local unit 3 includes an auxiliary circuit 33. When a failure occurs in the local area network device and it becomes difficult to control the lighting of the headlamps 41 by the network device, the auxiliary circuit 33 at least controls the headlamp 41.
This is a circuit for ensuring lighting of the dimmer lamp 41d. The auxiliary circuit 33 is configured by connecting a transistor 33a, a diode 33b, and resistors 33c, 33d, and the cathode of the diode 33b is connected to one switch 6 of the switches 6a, 6b, and 6c connected to another local unit 3.
The emitter of the transistor 33a is connected to the DC power source 7, and the collector of the transistor 33a is connected to the gate of the FET 32c of the driving means 32 via a resistor 32j. The switch 6a is the headlamp 41 lighting switch (2 in the existing lighting switch).
(equivalent to the stage switch), switch 6b is the main lamp 4
1m and dimmer lamp 41d switching switch (equivalent to the dimmer switch in existing lighting switches),
And the switch 6c is a fog lamp 42 lighting switch (
(equivalent to existing fog lamp switches). and,
When turning on the main lamp 41m of the headlamp 41, turn on the switch 6a and turn off the switch 6b.
Operate F. In addition, when lighting the dimmer lamp 41d, turn on the switch 6a and turn on the switch 6b.
Manipulate. Moreover, when lighting the fog lamp 42,
Turn on switch 6c.

Next, the load 4 is composed of a headlamp 41 consisting of a main lamp 41m and a dimmer lamp 41d, and a fog lamp 42. The fog lamp 42, main lamp 41m, and dimmer lamp 41d are connected to FETs 32a, 32b, and 32c of the driving means 32, respectively. Further, the sensor 5 detects a wire breakage using detectors 5a and 5b when the headlamp 41 is turned off, and connects the wire breakage detection output to the decoder means 31 of the local unit 3. The detection units 5a and 5b are composed of AND gates having negative logic input terminals 5c, 5d, 5e, and 5f, and the input terminals 5c and 5d are connected to the gate and drain of the FET 32b of the driving means 32, and Ends 5e and 5f are connected to the gate and drain of FET 32c. In addition, the output ends 5g of the detection units 5a and 5b
and 5h are the input end I2 of the decoder means 31, respectively.
and I3.

Next, the operation will be explained. (a) When the local area network device is normal. First, when turning on the main lamp 41m, switch 6
Turn on the switch a, and turn off the switch 6b. The local unit 3 connected to the switches 6a and 6b outputs encoded signals corresponding to the operating states of the switches 6a and 6b to the shared transmission line 1. This encoded signal is once received by the main control unit 2. The main control unit 2 decodes the contents of this encoded signal, determines the load 4 to be controlled, forms an encoded command signal, and outputs it to the shared transmission line 1. The local unit 3 to which the headlamp 41 is connected receives and decodes the encoded command signal from the main control unit 2 using the decoder means 31, and decodes the encoded command signal of the decoder means 31 in order to turn on the main lamp 41m of the corresponding headlamp 41. The load signal is transmitted from the output terminal O2 to the FET 32 of the driving means 32.
Output to b. As a result, the FET 32 of the driving means 32
b turns on the main lamp 41m.

Next, when lighting the dimmer lamp 41d, the switches 6a and 6b are turned on. Therefore, similarly to the above, the decoder means 31 receives and decodes the encoded command signal corresponding to the operating state of the switches 6a and 6b, and outputs a load signal from the output terminal O3 to the FET 32c of the drive means 32 in order to light the dimmer lamp 41d. . This results in
The FET 32c turns on the dimmer lamp 41d.

Next, when turning on the fog lamps 42,
Turn on switch 6c. Therefore, similarly to the above, the decoder means 31 receives and decodes the encoded command signal corresponding to the operating state of the switch 6c, and sends a load signal from the output terminal O1 to the FE of the drive means 32 in order to turn on the fog lamp 42.
Output to T32a. As a result, the FET 32a turns on the fog lamp 42. Note that in the auxiliary circuit 33, when the switch 6a is turned on, the transistor 33a is turned on. However, when outputting the lighting signal for the main lamp 41m from the output end O2 of the decoder means 31, the FET 32
Since the transistor d is turned ON and the FET 32c is held in the OFF state, the dimmer lamp 41d will not be erroneously lit regardless of the ON operation of the transistor 33a.

(b) When the local area network device is out of order. When a defect occurs in a part of the network device, the main lamp 41m and dimmer lamp 41d of the headlamp 41 cannot be turned on through the network device even if the switches 6a and 6b are turned on. however,
In the auxiliary circuit 33, when the switch 6a is turned on, the transistor 33a is turned on, the FET 32c is turned on, and the dimmer lamp 41d is turned on to maintain safety during night driving.

(c) When the headlamp 41 is disconnected. First, a case where the main lamp 41m is disconnected will be described. When the switches 6a and 6b are turned off, that is, when the main lamp 41m has not yet been turned on, the output terminal O2 of the decoder means 31 is at the "0" level. At this time, the main lamp 41m was disconnected.
The detection section 5a of the sensor 5 has input ends 5c and 5d both at the "0" level, and outputs a "1" level at the output end 5g. That is, the input terminal I2 of the decoder means 31 becomes "1" level. In this state, when the switch 6a is turned ON and the switch 6b is turned OFF to turn on the main lamp 41m, the decoder means 31
receives an encoded command signal indicating a lighting command for the main lamp 41m at the input end I1. However, the decoder means 31 has the main lamp 41 at the input end I2 as described above.
A "1" level signal indicating a disconnection of wire m is inputted, and due to this input signal, the output is not outputted to the output terminal O2 which should be outputted, but instead a "1" level signal is outputted to the output terminal O3. That is, the decoder means 31 turns on the dimmer lamp 41d instead of the disconnected main lamp 41m.

Next, a case where the dimmer lamp 41d is disconnected will be explained. When the switches 6a and 6b are turned off, that is, when the dimmer lamp 41d has not been turned on yet, the output terminal O3 of the decoder means 31 is "
At this time, if the dimmer lamp 41d is disconnected, the detection section 5b of the sensor 5 has the input ends 5e and 5f both at the "0" level, and the output end 5h has a "1" level.
” level. That is, the input terminal I3 of the decoder means 31 becomes the “1” level. In this state,
When the switch 6a and the switch 6b are turned on to turn on the dimmer lamp 41d, the decoder means 31 receives at the input terminal I1 an encoded command signal indicating a command to turn on the dimmer lamp 41d. However, the decoder means 31
As mentioned above, the "1" level signal indicating the disconnection of the dimmer lamp 41d is inputted to the input terminal I3, and due to this input signal, the output is not outputted to the output terminal O3 which should be output,
Instead, a "1" level signal is output to the output terminal O1. That is, the decoder means 31 turns on the fog lamp 42 instead of the disconnected dimmer lamp 41d.

[0017]

[Effects of the Invention] The first invention is characterized in that a switch connected to a predetermined local unit is connected to drive means of other local units, so that even if a failure occurs in the local area network device, the switch can be safely operated. It is possible to ensure the operation of loads of high importance related to driving. Also the second
The invention is characterized in that the load is composed of a plurality of vehicle lamps, a vehicle detection sensor is connected to the vehicle lamp, and a disconnection detection output from the sensor is connected to a decoder means. In particular, in order to deal with disconnection failures in vehicle lamps, when disconnection failures occur in vehicle lamps,
The decoder means of the local area network device can be used to turn on other normal lamps as an alternative.

[Brief explanation of drawings]

FIG. 1 is an electrical circuit diagram showing a preferred embodiment of the present invention.

FIG. 2 is an electrical block diagram of what is shown in FIG. 1;

[Explanation of symbols]

1 Shared transmission line 2 Main control unit 3. Local unit 4 Load 5 Sensor 31 Decoder means 32 Driving means 33 Auxiliary circuit

Claims (2)

[Claims] 1. A shared transmission path, a main control unit that sends an encoded command signal to the shared transmission path, and a load signal that receives and decodes the encoded command signal from the main control unit from the shared transmission path and corresponds to the encoded command signal. A local unit for a vehicle, comprising a decoder means for outputting a signal, a drive means for outputting a drive signal in response to a load signal from the decoder means, and a load connected to the drive means of the local unit. A local area network device for a vehicle, characterized in that, in the network device, a switch connected to a predetermined local unit is connected to drive means of another local unit in order to cope with a failure of the local area network device. . 2. A shared transmission line, a main control unit that sends an encoded command signal to the shared transmission line, and a load signal that receives and decodes the encoded command signal from the main control unit from the shared transmission line and corresponds to the encoded command signal. A local unit for a vehicle, comprising a decoder means for outputting a signal, a drive means for outputting a drive signal in response to a load signal from the decoder means, and a load connected to the drive means of the local unit. A network device for a vehicle, characterized in that the load is composed of a plurality of vehicle lamps, a sensor for detecting disconnection is connected to the vehicle lamp, and a disconnection detection output from the sensor is connected to a decoder means. Local area network equipment.