JPH01103044A - Multiplex transmission equipment - Google Patents

Abstract

PURPOSE:To improve the entire cost performance of a system by containing a slave multiplex communication unit not provided with a logic processing function via a slave transmission line to at least one of plural main multiplex communication units. CONSTITUTION:A data is transmitted/received mutually through a main transmission line 6 between a composite terminal 1 and main terminals 2, 3 and a data is transmitted/received through slave transmission lines 7, 8 respectively between slave terminals 4, 5 and the composite terminal 1. Then a composite logic processing section 13 applies logic processing to the signal in the composite terminal 1 between the slave terminals 4 and 5 to apply distribution control to other main terminals 2, 3. Then the data is transmitted/received via the main terminal 1 between the slave terminals 4, 5 and the other main terminals 2, 3.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a multiplex transmission device.The present invention relates to a multiplex transmission device.The present invention relates to a multiplex transmission device. It can be used as a system.

[Conventional technology]

In recent years, electronic control of automobiles has progressed, and in electronically controlled automobiles, it is necessary to transmit signals between various parts within the vehicle for various controls.

The amount of such transmission signals tends to increase with the advancement of electronic control, and therefore the number of signal lines for signal transmission also tends to increase significantly.

In response to this trend, it has been proposed to incorporate multiplex communication technology into signal transmission systems in vehicles such as automobiles as a means of reducing the number of signal lines and transmitting a large amount of data. This system installs multiplex terminals that perform multiplex communication such as time division multiplexing as terminals at points in the vehicle where signal transmission and reception is required, and connects the multiplexed terminals with a single transmission path to connect the necessary signal lines. This greatly reduces the number of The multiple terminals used in such systems each have a control function that logically processes multiple signal inputs to drive a load.

[Problem that the invention seeks to solve]

Some multiplex terminals do not need to be equipped with a logic processing function due to the characteristics of their location, but in conventional multiplex transmission equipment, each multiplex terminal is equipped with a logic processing function. Therefore, the conventional device does not have good cost performance as a whole system.

Therefore, an object of the present invention is to enable multiplex units without a logic processing function to coexist in a signal transmission system consisting of multiplex units with a logic processing function, and to distributively arrange the multiplex units with the most common functions in each location. The object of the present invention is to provide a multiplex transmission device that improves the cost performance of the device as a whole.

[Means for solving problems]

A multiplex transmission device according to the present invention is a multiplex transmission device in which a plurality of main multiplex communication units each having a logical processing function are connected via a main transmission path, and one or more secondary multiplex communication units not having any logical processing function are provided.

At least one of the plurality of main multiplex communication units is configured to include a circuit for accommodating a slave multiplex communication unit via a slave transmission path.

[Effect]

The main multiplex communication units exchange data with each other via the main transmission path. On the other hand, the slave multiplex communication unit sends and receives data to and from the main multiplex communication unit in which it is accommodated via the slave transmission path, and furthermore, this main multiplex communication unit communicates with other main multiplex communication units to the slave multiplex communication unit. By controlling the distribution of data from the main multiplex communication unit, data can also be sent and received between the slave multiplex communication unit and other main multiplex communication units. This eliminates the need for all multiplex communication units used in the system to have logical processing functions.

It becomes possible to arrange multiple units at each location, each having a function that best suits the characteristics of the location where the units are installed, and therefore the cost performance of the entire system can be improved.

〔Example〕

The present invention will be described in detail below with reference to one drawing.

A multiplex transmission apparatus as an embodiment of the present invention is shown in FIG. In this embodiment, the multiplex transmission device of the present invention is used in an automobile signal transmission system.

In FIG. 1, a composite terminal 1 and main terminals 2 and 3 are interconnected via a main transmission path 6 consisting of a bus. Complex terminal 1 and main terminals 2 and 3 are
Each is a terminal that performs time division multiplex transmission using the contention method.

Each has a control function that logically processes multiple signal inputs and drives a load based on the results.

The composite terminal l is provided in the dash panel near the driver's seat where wire harnesses are concentrated, and is connected to the switch group 11 and the load group 10 near the driver's seat, and receives signals from the switch group 11 and also connects the load group A drive signal can be output to 10. On the other hand, main terminal 2 is on the passenger side.

Main terminal 3 is also located on the rear side.

These main terminals 2, 3 have switch groups 21, 31, 21, 31, 21, 31, 21, 31, 21, 31, 31, 31, 21, 31, 31, 31. Load groups 20 and 30 are connected to each other, and signals are transmitted and received between them.

A slave terminal 4.5 is also connected to the composite terminal 1 via a slave transmission line 7.8. The composite terminal 1 has a function of transmitting and receiving signals between the main terminal 2.3 and the slave terminals 4.5 as well as transmitting and receiving signals.

The slave terminal 4 is arranged in the engine room and connected to the load group 40 in its vicinity, and is an output-only multiplex unit that drives the load group 40 in the engine room in response to multiplexed signals from the composite terminal 1. . In addition, the slave terminal 5 is located behind the meter on the dash panel.
This is an input-only multiplexing unit that multiplexes the signals of the switch group 50 arranged in the vicinity and sends it to the composite terminal 1. This slave terminal 5 is located on the back of the meter, inside the cluster switch, and inside the steering column cover.

It is also possible to arrange it in a junction box, etc., and the signals of the switches arranged in each place can be multiplexed and sent to the composite terminal 1.

Both secondary terminals 4 and 5 are point-to-point.

It performs simple multiplex transmission of points (for example, time slot multiplex transmission) via the slave transmission line 7.8, and does not have a function of performing logical operations on input signals.

The detailed configuration of the main terminal 2 is shown in FIG. The configuration of the main terminal 3 is also almost the same. In FIG. 2, the multiplexed signal on the main transmission path 6 is transmitted to the multiplexed signal decoder
is decoded and input to the complex logic processing section 23. Data is also input to the complex logic processing section 23 from the switch group 21 via the input sofa 25. The complex logic processing unit 23 performs AND and OR operations on these multiplexed input signals and input signals directly input from the nearby switch group 21 using four logic processing circuits 231 to 234.
It is equipped with functions to perform logic operations such as memory, timer, etc., and the results of the logic processing are converted into multiplex signals by the multiplex signal encoder 26 and sent to other multiplex terminals via the main transmission line 6. or output to the load group 20 via the output driver 24 and output to the load group 2.
Drive 0. The transmission and reception of signals to and from the transmission path 6 is controlled by a transmission path control section 26, such as the timing thereof.

The detailed configuration of the composite terminal 1 is shown in FIG. In FIG. 3, multiple signal decoder 12. Complex logic processing unit 13.
Output driver 14. Input buffer 15. Multiple signal encoder 16. The functions of the transmission path control section 17 and the like are almost the same as the corresponding elements in FIG.

The difference is that the composite terminal 1 has an input-only terminal section 18 . for accommodating the slave terminal 4 via the slave transmission line 7 . It also includes an output-only diameter terminal section 9 for accommodating the slave terminal 5 via the slave transmission line 8. The slave terminal sections 18 and 19 are both the complex logic processing section 13.
It is connected to the.

The slave terminal section 18 has a function of multiplexing a plurality of signals outputted from the complex logic processing section 13 and transmitting the multiplexed signals to the output-only diameter terminal 4 via the slave transmission line 7, and its configuration is as follows. It is almost the same as Terminal 5.

Further, the slave terminal section 19 has a function of decoding the multiplexed signal sent from the slave terminal 5 via the slave transmission line 8 into a plurality of signals and inputting the signals to the complex logic processing section 13.
Its configuration is almost the same as the slave terminal 4 described later.

The detailed configuration of the slave terminal 4 is shown in FIG. This is for output only, and the multiplexed signal received from the secondary transmission line 7 is decoded into multiple signals by the multiplexed signal decoder 42, and the decoding result is output to the output driver 43, which in turn decodes it into multiple signals. Drive the load accordingly. The detailed configuration of the slave terminal 5 is shown in FIG. This is for input only, and multiple 0's from the switch group 51
The N10FF signal is input to the multiplex signal encoder 53 via the input buffer 52, where it is converted into a multiplex signal and sent to the secondary transmission line 7.

In this embodiment, data is exchanged between the composite terminal 1 and the main terminals 2 and 3 via the main transmission line 6, and between the slave terminals 4 and 5 and the composite terminal 1, data is exchanged between them via the main transmission line 6. Data is sent and received via 7 and 8, respectively. Further, the composite terminal 1 can logically process the signals transmitted and received between the slave terminals 4 and 5 in the composite logic processing unit 13 and can control the distribution to the other main terminals 2 and 3. Data can also be sent and received between the main terminal 1 and the other main terminals 2 and 3 via the main terminal 1.

Various modifications are possible in implementing the invention. FIG. 6 shows another example of the slave terminal 5' arranged in the engine room. This one has a decoder 55. Driver transistor 56. Relay 57 as load driving means. A fuse 58 as a load protection means is integrated, which allows for an inexpensive configuration. Further, in the above embodiments, the multiplex terminal has been described as one that performs time division multiplex transmission, but the present invention is not limited to this, and may be one that performs frequency division multiplexing, for example, or wavelength division multiplexing in the case of an optical communication system. Further, in the above-described embodiment, the multiplex transmission device of the present invention was applied to a signal transmission system in an automobile, but the invention is not limited to this.
The present invention can be used in general signal transmission systems that perform multiplex communication.

〔Effect of the invention〕

According to the present invention, the conventional multiplex transmission device is configured only of a multiplex unit having a logical processing function.

Since it is possible to mix and arrange inexpensive secondary multiplex units that do not have a logical processing unit, it is possible to make the multiplex units have optimal functions according to the characteristics of each installation location. As a result.

The cost performance of the entire system can be improved and the price of the multiplex transmission device can be reduced.

Furthermore, since it is easy to increase the number of secondary multiplex terminals, it is possible to easily handle system upgrades and additions of variations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a multiplex transmission device as an embodiment of the present invention, FIG. 2 is a block diagram showing the detailed configuration of the main terminal in FIG. 1, and FIG. 3 is a composite terminal in FIG. 1. FIGS. 4 and 5 are block diagrams showing the detailed configuration of the slave terminal in FIG. 1, and FIG. 6 is a block diagram showing another example of the configuration of the slave terminal. It is a diagram. 1.2.3 - Lifetime terminal 4, 5 - Slave terminal 6 - Main transmission line 7.8 - Slave transmission line 11.2]
. 31, 50--Switch group 12.22.42-Multiple signal decoder 13.23--Complex logic processing unit 15.
25.52-・Input buffer 14.24.43-・-
Output driver 1 (i. 26, 53...-Multiple signal encoder 17.27-Transmission line control section 10.20.30.40-Load group patent distributor Mazda Motor Corporation No. 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] A multiplex transmission device in which a plurality of main multiplex communication units each having a logical processing function are connected via a main transmission path, wherein one or more secondary multiplex communication units not having any logical processing function are provided; A multiplex transmission apparatus characterized in that at least one of the main multiplex communication units is configured to include a circuit for accommodating the slave multiplex communication unit via a slave transmission path.