JPH0451798A - Signal transmission system - Google Patents

Abstract

PURPOSE:To realize saving of lines by connecting one side of terminals and other side of terminals respectively in common in each switch of a switch module and connecting an element to each switch so as to cause a specific impedance between terminals in response to the combination of the states of each switch. CONSTITUTION:Each of switches 11-15 of a switch module 10 and a control module 17 are connected through two transmission lines 16, 18 to form the switch module 10 as part of an RC astable oscillation circuit 19 of the control module 17 thereby sending the state of the switches 11-15 to the control module 17 through the two transmission lines 16, 18. As a result, the operation of auxiliary devices 22-26 is controlled in response to a frequency signal generated from the RC astable oscillation circuit 19. Thus, the number of wires between the switch module 10 and the control module 17 is saved more than that of a conventional system.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a switch module mounted on, for example, a vehicle, and particularly to a signal transmission system suitable for use when wiring between the switch module and a control module that controls each electrical component in the vehicle is reduced.

[Conventional technology]

Conventionally, the wiring between the switch module and the control module is as shown in FIG.
One side terminal of E is connected to the control module 3 by a common wiring 2, while the other side terminal is connected to each independent wiring 4.5.6
．． 7.8 is connected to the control module 3. That is, between the switch module 1 and the control module 3, one or more wires are required for one bit of switch information. Then, the control module 3 controls the supplements 9A, 9B, 9C19D, and 9E connected to the control module 3 based on the switch information of conduction or non-conduction of each switch IA to IE of the switch module 1. There is.

[Problem to be solved by the invention]

By the way, the conventional connection method between the switch module and the control module as described above has the following problems. In other words, the number of wires between the switch module and the control module is proportional to the number of switches that make up the switch module, so the problem is that the number of wires increases as the number of switches in the switch module increases. there were. The present invention solves the above-mentioned problems, and aims to provide a signal transmission system that achieves wiring savings between a switch module and a control module at low cost.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a plurality of switches arranged in parallel, and each switch connected in series to each of the switches, and corresponding to a combination of a conductive state or a non-conductive state of each of the switches. a first wiring commonly connected to one terminal of each of the switches of the switch module, and the other terminal of each of the switches of the switch module; a transmission path that is connected to the switch module via the transmission path, and that is connected to the switch module in accordance with the combination of conductive state or non-conductive state of each switch of the switch module. an oscillating means for outputting a signal having an oscillation frequency; and counting output signals from the oscillating means, determining a conductive state or a non-conducting state of each switch of the switch module based on the counting result, and controlling based on the determination result. a control module including a control means for outputting a signal, and a drive means for outputting a drive signal based on a control signal from the control means; and a driven object to be driven.

[Effect]

According to the present invention, one terminal of each switch of the switch module is commonly connected by the first wiring, and the other terminal is commonly connected by the second wiring, and further, depending on the combination of states of each switch, Since the elements are connected to each switch in a way that creates a unique impedance between the terminals, wiring can be shared between the terminals of each switch and the control module, resulting in wire savings compared to conventional methods. It becomes possible to do so.

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 is a diagram showing the configuration of a switch module, a control module, and a supplementary unit of this embodiment, which is mounted on a vehicle, for example. At the same time,
Each switch 11 to 15 has resistors R1, R2, R3, and R4.
, R5 are connected in series. One side terminal of each switch 11 to 15 constituting the switch module 1o is connected to a control module 17 by a transmission line 16, and
The other terminal is connected to the control module 17 by a transmission line 18. In this case, each of the resistors R1 to R5
The resistance value of is determined. Further, the control module 17 is provided with an RC astable oscillation circuit 19, a control module CPU 20, and a complementary drive FET 21. Each input terminal 19A, 19B of the RC astable oscillation circuit 19
each have a transmission path 1 from the switch module 10.
6.18 is connected, and the switch module IO is configured as a part of the RC astable oscillation circuit 19. As a result, each switch 11 of the switch module 10
~15 switch states, the two transmission lines 16 and 18
It is now possible to transmit the information to the control module 17 by using the control module 17. Further, the output terminal 19C of the RC astable oscillation circuit 19 is connected to the count input terminal 20A of the control module CPU 20, and the RC astable oscillation circuit 19 is connected to the output terminal 19C of the RC astable oscillation circuit 19.
9C to each switch 11~ of the switch module 10
Control module C generates a unique oscillation waveform according to the state of 15.
It is configured to output to the count input terminal 20A of the PU20. Thereby, the control module CPU 20 counts the pulses manually inputted from the count input terminal 2OA, and also controls each switch 11 to 1 of the switch module 10 based on the number of pulses counted in a preset fixed period.
5 states are determined. Furthermore, the output capo 120 of the control module CPU 20
B is connected to the input end 21A of the supplementary drive FET 21, and the control module CPU 20 outputs a control signal from its output port 20B to the input 121A of the supplementary drive FET 21. Further, catch molds 22, 23, 24, 25, and 26 are connected to the output port 21B side of the supplementary drive FET 21. As a result, the control module CPU 20 uses the complementary drive FET 21 to control the capture type 22, 23, 24, 25, 26.
is designed to be controlled. That is, in this embodiment, as described above, since the switch module IO is configured as a part of the RC astable oscillation circuit 19 of the control module 17, the switch module 10
The conductive state/non-conductive state of each of the switches 11 to 15 can be transmitted to the control module 17 via two transmission lines 16 and 18. As a result, in the control module 17, each trap type 22 to 26 is
It is now possible to control the operation of Next, the operation of this embodiment with the above configuration will be explained. The 0N10FF switch state of each switch 11 to 15 of the switch module 10 is determined by the two transmission lines 16.1.
RC astable oscillator circuit 19 of control module 17 via 8
transmitted to. As a result, the RC astable oscillation circuit 19 outputs an oscillation waveform corresponding to the switch state of each switch 11-15 to the control module 20, so that the control module 20 outputs an oscillation waveform to each switch 11-15 according to the number of pulses counted in a certain period of time. 15 is determined, and based on the determination result, the capture molds 22 to 26 are activated by the complementary drive FET 21.
control. That is, according to the above embodiment, each of the switches 11 to 15 of the switch module 10 and the control module 17 are connected by two transmission lines 16 and 18, and the switch module 1
0 as part of the RC astable oscillator circuit 19 of the control module 17, the state of each switch 11-15 can be transmitted to the control module 1 through the two transmission lines 16 and 18.
As a result, the operation of each of the trap molds 22 to 26 can be controlled according to the frequency generated from the RC astable oscillation circuit 19. As a result, when compared with the conventional case, the switch module 10 and the control module 1
It becomes possible to save the wiring between the 7 and 7.

[Modified example]

■ In the above embodiment, the resistors R1 to R5 are connected in series to each switch 11 to 15 of the switch module 10, but the configuration is not limited to this, and as shown in FIG. Capacitor 36~
By connecting 40 in series, each switch 31 to 35
It is also possible to determine the switch state by changing the impedance between the terminals of the switch. ■ Also, as shown in FIG.
By connecting switches 6 to 60 in series, each switch 51 to
It is also possible to determine the switch state by changing the impedance between the terminals 55.

【Effect of the invention】

As explained above, according to the present invention, the following effects can be achieved. ■Since the wiring connecting each terminal of the plurality of switches constituting the switch module and the control module can be shared, the wiring between the switch module and the control module can be saved. ■The switch module of the present invention can be configured by simply connecting low-cost parts such as resistors and capacitors to each switch of the switch module, which may lead to high costs (
This makes it possible to save wires without any problems.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a connection configuration of a switch module/control module/auxiliary module according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a configuration of a modified switch module, and FIG. FIG. 4 is a circuit diagram showing the configuration of a modified switch module, and FIG. 4 is a circuit diagram showing a conventional switch module/control module/auxiliary connection configuration. 1, 0...Switch module, 11-15...
Switch, 16... Transmission line, 17... Control module, 18... Transmission line, 19... RC astable oscillation circuit (oscillation means), 20... Control module CPU
(control means), 21...FET for supplementary drive (
Driving means), 22-26...Supplementary profit (driving object),
36~40... Capacitor (element), 56~60...
Capacitor (element), R1-R5...Resistance (element)
.

Claims (1)

[Claims] A plurality of switches (11, 12, 13,
14, 15), and an element (R1, R2, R3, R4, R5); a first wiring commonly connected to one terminal of each of the switches of the switch module; and a first wiring commonly connected to the other terminal of each of the switches. a transmission path (16, 18) having a second wiring line connected to the switch module via the transmission path, and configured to be connected to the switch module according to the combination of conductive state or non-conductive state of each switch of the switch module. an oscillating means (19) for outputting a signal having an oscillation frequency; counting output signals from the oscillating means; and determining the conductive state or non-conductive state of each switch of the switch module based on the counting result; and the determined result. a control means (20) that outputs a control signal based on the control means; and a drive means (21) that outputs a drive signal based on the control signal from the control means.
); a control module (17) comprising: a drive object (22, 2) connected to the drive means of the control module and driven by a drive signal from the drive means;
3, 24, 25, 26).