JPS61218241A - Multiplex transmitter - Google Patents

Abstract

PURPOSE:To simplify the constitution of a processing circuit by using a signal being data from an input signal to actuate a device connected to a receiver and outputting a prescribed control signal set as a countermeasure for a fault to an external device if input signals of plural systems are dissident. CONSTITUTION:If one of lines L1, L2 is opened or there is an improper contact in an interlocking switch 13, since the lines L1, L2 have signal levels of 1, 0 or 0, 1, a high level signal 1 is outputted from an exclusive OR circuit 15, a contact 3a of a gate switch 3 is opened, a transmitter 11 cannot input a synchro nizing signal from an address clock line nor transmit the data. In this case, a signal output means 9 of the receiver 5 lights front lamps HR, HL as the safety countermeasure at a fault based on the detection of the fault.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiplex transmission device that can efficiently transmit data.

[Prior art] Examples of conventional multiplex transmission devices include, for example, the
There is something like the one shown in No. 13367.

This is an example of the so-called time-sharing method, and its outline will be explained in the second section.
Shown in the figure.

In the figure, reference numeral 101 is an address clock generator that repeatedly generates a code string called, for example, an M sequence, and sends this out to an address clock line 103 in synchronization with an O clock signal. Considering a 3-bit code string, this M sequence is such that all 3-bit code string patterns except L, L, and L are sequentially used once each during the period. Transmitter 105 connected to address clock line 103 and corresponding receiving Ia 107
The device constantly monitors the code string for the appearance of the address assigned to its own device.

That is, the transmitter 1105 and the corresponding receiver 1O7 are assigned addresses H, H, and L, for example.
When a code string pattern matching this appears, the transmitter 1
05 encodes a signal input from the outside via the input line 105a and sends the encoded data to the data line 109. At the same time, the receiver 107 transmits this data to the data line 109.
A control signal corresponding to the input data is output via the output line 107a. Examples of the input information of the transmitter include on/off information for various switches, such as vehicle headlight switches, and examples of devices controlled by the output signals of the receiver include information on the various switches that are controlled based on the various switch information. An example of such equipment is a headlamp.

By the way, there are cases where the statuses are transmitted in a divided manner using various transmission devices having the above-mentioned configurations.

As an example of this, for example, the on/off information for the left and right headlights of a vehicle is transmitted in two independent systems, so that even if a failure occurs in the transmission system for one headlight, at least the other headlight will be transmitted. An example is a structure that increases safety by lighting up.

Conventionally, this type of transmission has been performed using, for example, the multiplex transmission apparatus shown in FIG. 2 as is.

That is, two input lines are connected to the input line 105a of the transmitter 105, information input from these input lines is converted into data by an encoding circuit provided in the transmitter 105, and the converted data signal is sent to the data line 109. It is transmitted via. The data received by the receiver 107 is decoded here, and one or both of the left and right headlights are controlled to be turned on independently.

On the other hand, conventionally, the receiver 107 is generally provided with an abnormal state detection means, which constantly monitors level fluctuations and signal states of the address clock transmission path or the data transmission path, and equipment connected to the receiver 107 in the event of an abnormality. Depending on the situation, the system may stop its operation or keep it in constant operation.

Therefore, in the above example of the headlights, in the event of an abnormality, that is, when an abnormality occurs in the signals input from the address clock transmission line or the data transmission line, both front headlights are turned on. It's Nishide.

However, in such a conventional multiplex transmission device, when it is desired to transmit the negative state by dividing it into systems, as exemplified in the above-mentioned headlamp lighting circuit, the input information of the independent systems can be transmitted as is. Since the configuration required transmission, the number of signal lines input to the transmitter also increased as the system was divided, complicating the encoding circuit, and the processing circuit of the receiver also became more complex as the system was divided. There was a problem.

[Objective of the Invention] This invention improves the above-mentioned problems, and even if there are multiple signal input systems representing one state, the processing is equivalent to processing the signals of one system on both the transmitter and receiver sides. It is an object of the present invention to provide a multiplex transmission device which is sufficient to provide a transmission quality equal to or higher than that of transmission divided into multiple systems.

[Summary of the Invention] This invention, which can achieve the above object, has a plurality of transmitters and receivers connected to each other via a transmission path, and transmits data between transmitters and receivers at a predetermined address based on a predetermined synchronization signal. A multiplex transmission device configured to perform transmission includes a plurality of signal lines connected to the transmitter, and a plurality of signal lines in which at least one of the signal lines expresses one state at the same level. and data output stopping means for stopping data output when signals appearing on the plurality of signal lines do not match, and the receiver corresponding to the transmitter is configured to prevent data from being supplied. The present invention includes an abnormal state detection means that determines that the music is one of the abnormal original songs, and a signal output means that outputs a predetermined signal set as an abnormality countermeasure in the event of an abnormality.

Therefore, under normal conditions, the signal lines of multiple systems are all at the same level, so the transmitter can know one state through one connected line, convert this state into data, and send it to the receiver. The receiver can receive this data and control the connected device to a normal state.

Further, in the event of an abnormality, a mismatch occurs in the levels of the signal lines of the plurality of systems, so the transmitter stops transmitting the data of the one status signal based on this mismatch. Then, the receiver determines that this data transmission stop is an abnormal state and outputs a signal set as a countermeasure against an abnormality, so that it is possible to take necessary measures for the connected equipment.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a circuit diagram of a multiplex transmission apparatus according to an embodiment of the present invention.

In the figure, elements that perform the same functions as the conventional multiplex transmission apparatus are given the same numbers as in the conventional example, and detailed explanations of these elements are omitted.

In this example, two left and right headlights are turned on simultaneously based on switch information operated from the driver's seat of the vehicle.

In FIG. 1, a transmitter 1 is connected to an address clock line 103 via a gate switch 3. When the gate switch 3 is open, the address clock signal shown in the conventional example can be input as is, but when it is open, it cannot be input, and the transmitter cannot output data during this time. Can not.

The receiver 5 is equipped with an abnormal state detection means 7, which constantly monitors the signal states of the address clock line and the data line. The left and right headlights HR and HL are connected to the output terminal, and when data indicating that the headlights should be turned on is input from the transmitter 1, both headlights HR and HL are turned on and then turned off. If data indicating that the display should be displayed is input, both of these lights are turned off. A signal output means 9 is provided for outputting a signal to turn on both headlamps when the abnormal state detection means 7 detects an abnormal state.

On the other hand, an encoding means 11 is provided inside the transmitter 1,
This encoding means 11 is connected to one of the two input lines L1 and L2 that is input via the two-way interlocking switch 13.
+ is connected.

Further, the input circuits 11L+ and L2 are input to an exclusive off circuit, and its output terminal is connected to the gate switch 3.
is connected to the input terminal. The gate switch 3 opens a normally closed contact 3a provided therein when a high level signal is output from the exclusive off circuit 15. The gate switch 3 and the exclusive OR circuit 15 constitute a data output stopping means DS.

The operation of the multiplex transmission apparatus having the above configuration will be explained.

Now, assuming normal conditions, the signal level output to lines L+ and 12 is 1.1 when the interlocking switch 13 is on.
In the off state, it is 0.0.

In this normal state, the EXCLE 9711 circuit 15 outputs a low level signal ○, and the gate switch 3 remains closed. Therefore, in this state, the transmitter 'a1 can perform normal data transmission. That is, since the encoding means 11 is connected to the line LT, a signal of 1 is input when the interlocking switch 13 is on, and a signal of O is input when it is off.
These signals can be converted into data. The data 1 or O signal is transmitted to the receiver 1115 and decoded there, and both the headlights (IRSHL) and IRSHL are turned on or off.

Next, assume an abnormal state. In this abnormal state, line L
+, L2 may be disconnected, or there may be a contact failure in the interlock switch 13. In these cases, the lines L+ and L2 have a signal level of 1, O, or 0.1, so these levels are determined by the exclusive OR circuit 15.
A high-level signal 1 is output from this circuit 15, and the contact 3a of the gate switch 3 is opened.

If the contact 3a of the gate switch 3 is open, the transmitter 1 cannot receive a synchronization signal from the address clock line and cannot transmit data.

On the other hand, at that time, although the receiver 5 has data input at a predetermined timing, no data is inputted for the above-mentioned reason, and this state is detected as an abnormal state by the abnormal state detection means, and based on this detection, the signal output means 9, both headlights HR1HL are turned on as a safety measure in the event of an abnormality.

Note that the abnormal state detection means 7 does not only detect the data shortage state as described above via the lines L+ and L2, but also constantly detects the signal states of the address clock line and the data line as shown in the conventional example. This is because
Of course, both the headlamps HR and HR are turned on even if these lines are abnormal.

As a result of the above, the headlights HR and HL will be activated if there is an abnormality in any one of the lines L+, L2, address clock line, data line, etc. If there is an abnormality in at least one of them, the light will be lit. The reason why both headlights are turned on in these abnormal situations is to prevent so-called one-eyed driving, but in this example, since one-eyed driving is prevented both in normal and abnormal conditions, the vehicle Safety can be improved.

[Effects of the Invention] As described above, this invention converts one of the input signals of one state into multiple systems into data using the encoding circuit of the transmitter, and connects the converted signal to the receiver. In addition to activating the device, if there is a discrepancy between the input signals of the multiple systems, a predetermined control signal set as an abnormality countermeasure is output to the external device. It is possible to simplify the configuration of the processing circuit by processing the same signal as that for signal processing, and furthermore, it is possible to provide a multiplex transmission device that has transmission quality equivalent to or better than that obtained by dividing the transmission into multiple systems. .

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a multiplex transmission device showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional multiplex transmission device. 1... Transmitter 3... Gate switch 5... Receiver 7... Abnormal condition detection means 9... Signal output means 11... Encoding means 13... Two interlocking switches 15. ... Exclusive OR circuit 101 ... Address clock generator 103 ... Address clock line 109 ... Data line 1-IR, HL ... Headlight L+, 12 ... 2 system line patent Applicant Nissan Motor Co., Ltd. j8? j;7jjj-(:l:

Claims (1)

[Claims] In a multiplex transmission device in which a plurality of transmitters and receivers are connected to each other via a transmission path and data is transmitted between the transmitters and receivers at a predetermined address based on a predetermined synchronization signal, At least one of the signal lines is a plurality of signal lines that express one state at the same level, and when the signals appearing on the plurality of signal lines do not match, the data is and a data output stop means for stopping the output of the transmitter, and the receiver corresponding to the transmitter has an abnormal state detecting means for determining that the non-supply of data is one of the causes of the abnormality, and is set as an abnormality countermeasure in the event of an abnormality. 1. A multiplex transmission device comprising: signal output means for outputting a predetermined signal.