JPS61280142A - Start system for loop multiplex transmitter - Google Patents

Abstract

PURPOSE:To eliminate the need for a wiring for power control by applying a power of a transmitter when the necessity of operation of one transmitter in a loop is caused and using an initial reset pulse initializing the circuit in the transmitter in this case as a timing pulse of power application of the transmitter of the next stage via a signal transmission line at it is. CONSTITUTION:When a parking light drive switch 36 is turned on and the power of the control system of a transmitter 31 is applied, an initial reset pulse is outputted from the initial reset circuit and the power of the control application system is given to the transmitter 32. Similarly, the power of the control of the transmitters 33-35 is applied sequentially and the initial reset pulse is outputted. Then the drive signal of a parking light 37 is sent from the transmitter 31 to the transmitter 34 via a signal line 30a to drive the parking light 37.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for starting a loop-type multiplex transmission device in which a plurality of transmission devices are connected in a loop, and in particular to a method for multiplexing and transmitting signals within a vehicle. The present invention relates to a startup method suitable for starting a loop-type multiplex transmission device.

[Prior art]

Conventionally, as a technology of a multiplex transmission device that multiplexes and transmits signals in a car, there is a technology described in Automotive Technology, 38 (2) (198
4), Susumu Hiraoka, Tetsuo Sugimoto, pages 215-220. The multiplexing transmission device multiplexes and transmits a large number of signals within a vehicle using several signal lines, thereby suppressing an increase in power supply and an increase in shape and size due to an increase in signals. However, since signals are multiplexed in this multiplex transmission device, the device is composed of electronic circuits such as microcomputers, and it is necessary to supply power to the electronic circuits (see page 217 of the above-mentioned document). (See Figure 42 and Figure 5).

On the other hand, since a battery is the main power source for the control device of an automobile, it is necessary to minimize current consumption when the automobile is stopped. For this reason, traditionally.

When signal transmission and processing are not required during stoppage, the power to the multiplex device is cut off, and power is supplied only when signal transmission and processing are necessary. FIG. 2 is a block diagram showing the configuration of a conventional transmission device that controls power as described above. In the figure, l is a receiving circuit that receives signals from a loop transmission line, T1 is its connection terminal,
2 is a transmission circuit that sends signals to the transmission path, T2 is its connection terminal, 3 is a transmission control circuit that controls the transmission and reception of signals, and 4 is a transmission control circuit that controls the entire transmission device, controls input/output, signal processing, and other transmission devices. 5 is an input circuit that inputs various signals inside the car, ■ is its input terminal, 6 is an output circuit that drives lamps, etc. inside the car, 0 is its output terminal, 7 is a power supply An initial reset circuit initializes each circuit in the transmission device when it is turned on, 8 is a power supply control circuit that turns the power supply of the transmission device 0N10FF according to an external control command, C is an input terminal for control commands, and P is a power supply connection terminal. show.

When signal transmission and processing are not required, input terminal C
A power cut-off command is sent to the power control circuit 8 through the power supply control circuit 8 to cut off the power, and a power-on command is sent to the power control circuit 8 to turn on the power only when signal transmission and processing is necessary.

[Problem that the invention seeks to solve]

However, the transmission device with the above configuration has the disadvantage that signal lines are required for power supply control, although the number of signal lines is attempted to be reduced by multiplexing. In particular, in the case of a loop type, the power supply control lines are installed in parallel, so the influence is very large.

The present invention has been made in view of the above points, and eliminates the disadvantage of requiring a signal line for power supply control.
By using the signal lines that are used to transmit information,
An object of the present invention is to provide a startup method for a loop-type multiplex transmission device that allows power to be turned on when necessary.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a loop-type multiplex transmission device in which a plurality of transmission devices are connected in a loop through transmission lines, in which the power supply system of each transmission device is constantly turned on with a small current. system, and a control input system that is activated after receiving a control command.

A switching circuit that can turn on/off the power of the control system, a means for turning on the power of the control system using the switching circuit when the conditions for powering on each transmission device alone are satisfied, and an electronic circuit that can be used immediately after power is turned on. A loop-type multiplex transmission device is provided by providing an initial reset transmitting circuit for transmitting a pulse to be initially reset to the next stage, and a switching circuit control means for receiving the initial reset pulse from a previous stage transmission device and thereby controlling the switching circuit. Configured.

[Effect]

With the above configuration, when one of the transmission devices in the loop is powered on, an initial reset pulse sent from the transmission device causes the remaining transmission devices to be connected via the switching circuit control means. The power can be turned on.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the configuration of each transmission device of a loop multiplex transmission device according to the present invention. In the same figure, 1
is a receiving circuit that receives signals from a loop transmission line, T1
is the connection terminal, 2 is the transmission circuit that sends the signal to the transmission path, and T
2 is a connection terminal thereof, 3 is a transmission control circuit that controls the transmission and reception of signals, and 4 is a transmission control circuit that controls the entire transmission device, controls the transmission and reception of input/output signals, performs signal processing, and performs transmission processing with other transmission devices as necessary. 5 is an input circuit that inputs various signals inside the car, I is its connection terminal, 6 is an output circuit that drives lamps in the car, 0 is its connection terminal, 7 is a transmission device when the power is turned on. A reset circuit 8c is received by the input circuit 5 and is used to send signals necessary to put the transmission device into operation (for example, a parking light drive switch, a door unlock switch, etc.) 8b is a power status holding circuit that stores the power-on command from the OR circuit 8c.

8a is a switching circuit that turns on/off the power according to the signal from the power status holding circuit 8b, P is a power supply connection terminal, and 2a is a circuit for transmitting a transmission signal to the next stage transmission device and an initial reset pulse from the initial reset circuit 7. This is a logical sum circuit that calculates a logical sum.

In the transmission device having the above configuration, the input circuit 5. The OR circuit 8c, the power supply status holding circuit 8b, the power-on/off switching circuit 8a, and the transmission line receiving circuit 1 are powered by the above-mentioned always-on system power supply, and the remaining circuits are powered by the control-on system power supply. The power supply system is such that power is supplied.

In the transmission device having the above configuration, first, the operation of the transmission device alone until the power is turned on will be explained. When the aforementioned parking light drive switch in the automobile is activated, its output signal is received by the input circuit 5.

The output of the input circuit 5 passes through the OR circuit 8C,
Power status holding circuit 8b is set to the on state. As a result, the switching circuit 8a is turned on, power is supplied from the battery to the power source of the power-on system, and the entire transmission device becomes operational. At the same time as power is supplied, an initial reset pulse that initializes each circuit is output from the initial reset circuit 7, and this reset pulse is transmitted to the next stage transmission device via the OR circuit 2a and the transmission circuit 2. 0 or more are the series of operations when the power of the transmission device alone is turned on. On the other hand, this type of transmission device is installed in various parts of the car, and since the parking light drive switch was activated by the aforementioned transmission device, it drives the parking light connected to the output circuit of another transmission device, and so on. Therefore, it is necessary to turn on the power to start up other transmission devices. This operation will be explained using a loop type multiplex transmission apparatus having the system configuration shown in FIG.

In the same figure, five transmission devices are connected in a loop through signal transmission paths. In the diagram, 31, 32, 33°, 34.35 indicate transmission devices, 30a is a signal transmission path, and 30b is a signal transmission path.
indicates a power supply line that supplies power to each of the transmission devices 31 to 35, 36 indicates the above-mentioned parking light drive switch, 37 indicates a parking light, and 38 indicates a battery.

36 is the aforementioned parking light drive switch.

37 indicates a parking light, and 38 indicates a battery.

First, as mentioned above, the parking light drive switch 36
The transmission device 31 detects that the transmission device 3 has operated.
1 is turned on as described above.

As a result, an initial reset pulse is output from the initial reset circuit 31 of the transmission line 31, the initial reset pulse passes through the OR circuit 2a, and the transmission device 32 is constantly powered on from the transmission circuit 2 via the transmission line 30a. The received signal is received by the receiving circuit 1.

Then, the switching circuit 8 turns ONL via the logical sum circuit 8c, and the power of the control turn-on system of the transmission device 32 is turned on, and the timing pulse for turning on is sent to the next stage, and each method is sent sequentially. Devices 33 to 35 are put in,
When all the transmission devices 31 to 35 are powered on and the initialization of one circuit is completed.

Transmission and processing of information becomes possible, and in the example shown in FIG.
The parking light 37 connected to 4 can be driven.

FIG. 4 is a timing chart for explaining the above operation, in which the parking light drive switch 36 is turned on.
(See the same figure (,), the power supply of the control input system of the transmission device 31 is turned on via the input circuit 5, the OR circuit 8c, the power status holding circuit 8b, and the switching circuit 8a (see the same figure (b)). ), when the power to the control input system is turned on, an initial reset pulse is output from the initial reset circuit (see (c) in the same figure), and the power to the control input system is turned on to the transmission device 32 (see (c) in the same figure). (see (d) to (g) in the same figure). In the same way, the control system of the transmission devices 33 to 35 is sequentially powered on and an initial reset pulse is output (see (d) to (g) in the same figure).Subsequently, the transmission bag is output from the transmission device 31. A drive signal for the parking light 37 is transmitted to !34 via the signal transmission path 30a (
(see figure (h)), drives the parking light 37 (
(See figure (i)).

In the above embodiment, a loop-type multiplex transmission device consisting of five transmission devices has been described as an example, but it goes without saying that the number of transmission devices may be any number from two to more.

Further, in the above embodiment, a loop-type multiplex transmission device that multiplexes and transmits signals in a car was explained as an example, but the present invention is not limited to this, and the present invention is not limited to this, and the present invention is not limited to this. It goes without saying that the present invention can be applied to a loop type multiplex transmission device connected to.

〔Effect of the invention〕

As explained above, according to the present invention, it is necessary for one transmission device in the loop to operate after separating the power supply system of the loop type transmission device into a always-on system and a controlled-on system that is turned on only when necessary. When this occurs, turn on the power to the transmission device,
The initial reset pulse that initializes the circuit inside the transmission device at that time can be used directly as a timing pulse for powering on the next stage transmission device via the signal transmission path, so there is no need for power control wiring. Demonstrates an excellent effect in reducing wiring costs.

Further, it has the effect that only a simple circuit needs to be added, and power consumption can be kept to a minimum.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of each transmission device of a loop multiplex transmission device according to the present invention, FIG. 2 is a block diagram showing the configuration of a conventional transmission device, and FIG. 3 is a block diagram showing the configuration of a conventional transmission device. FIG. 4 is a block diagram showing the system configuration of the transmission device, and a timing chart for explaining its operation. In the figure, 1... receiving circuit, 2... transmitting circuit, 3...
Transmission control circuit, 4... Main control circuit, 5... Input circuit, 6... Output circuit, 7... Initial reset circuit, 8a
... Switching circuit, 8b... Power status holding circuit, 8c... OR circuit, 30a... Signal transmission path, 30b... Power supply line control, 31-35... Transmission device, 36.・・Parking light drive switch, 3
7... Parking light, 38... Battery.

Claims (1)

[Claims] In a loop-type multiplex transmission device in which multiple transmission devices are connected in a loop through transmission lines, the power supply system of each of the transmission devices is separated into a constant power system that is always turned on and a controlled power system that is turned on by a power-on command. and a switching circuit that can turn on/off the power of the control system, and an initial reset pulse that sends a pulse to the transmission line to initialize the electronic circuit of the transmission device when each transmission device is powered on independently. A sending circuit and a switching circuit control means for receiving an initial reset pulse from a preceding transmission device in the loop and controlling the switching circuit are provided, and when any one transmission device in the loop is powered on, A startup method for a loop-type multiplex transmission device characterized by turning on the power of the remaining transmission devices in a chained manner.