JPS6232920Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch device for an automobile that can be applied to, for example, commands to set and release a constant speed cruise control device.

Generally, in an automobile switch device, only the horn switch is placed on the top of the steering wheel, some of the other switches are mounted on the steering wheel column, and the rest are placed on the instrument panel. However, it is desirable that switches such as a constant speed cruise control device that must be operated while the vehicle is running can be operated while touching the steering wheel, and that they are located in a position where they can be instantly visually recognized.

However, since the steering device is rotatably attached to the vehicle body, it is not easy to attach switches to the steering device. Regarding the above-mentioned horn switch, a direct current path including, for example, a contact ring is provided to electrically connect the horn mounted on the vehicle body and the horn switch on the steering wheel. . However, when installing other switches, providing such a DC current path for each switch leads to the structural complexity of the device, and furthermore, there is a problem of lowering the reliability of the device.

In order to eliminate such problems,
In the switch device described in Publication No. 41527, 1
It has been proposed to use a direct current path to generate different voltage signals when a plurality of switches are operated individually and to transmit them through this direct current path. However, in this method, there is a risk that disturbances such as voltage fluctuations in the on-vehicle battery or voltage drops occurring in the contact ring or other parts may impede accurate determination of the voltage signal corresponding to each switch.

The object of the present invention is to provide a highly reliable automotive switch device that eliminates the above-mentioned problems.

Another object of the present invention is to provide a switch device for an automobile that has a simple structure, in particular, simplifies the equipment added to the steering system and makes it possible to easily supply power to the equipment.

An embodiment of the present invention will be described below as shown in the accompanying drawings. In FIG. 1, a steering device H projects from the front of the vehicle interior toward the interior of the vehicle interior, and is supported by a vehicle body B via a known rotation transmission mechanism R. As shown in FIG. The steering gear H has an open/close switch 5 including a normally open contact for instructing the activation of a warning horn, and an operating device 1 consisting of a plurality of electric switches 1a, 1b, and 1c, which are operated on the inside of the vehicle. The parts are exposed and are mounted at sufficient intervals on the steering gear. The on-off switch 5 is connected to a horn 7 and an on-vehicle battery 8 in the vehicle body B via a DC current path 6 including a known contact ring 6a. When the on-off switch 5 is closed, the horn 7 is energized by the direct current flowing from the on-vehicle battery 8 through the DC current path 6 and the on-off switch 5 to the body ground, causing it to sound.

A transmitting circuit 2 is attached to the steering device H,
This transmitting circuit 2 is operated by being supplied with power from an on-vehicle battery 8 via the DC current path 6, and generates frequency signals corresponding to the opening/closing signals of the electric switches 1a, 1b, and 1c, and also connects a capacitor to the DC current path. It is configured to superimpose the signal and transmit it to the electric device on the vehicle body side. In the transmitting circuit 2, 201 is a signal generating circuit that generates a frequency code signal corresponding to the electric switch 1a, 1b, 1c when the switch is closed, and is manufactured by Mitsubishi Electric Co., Ltd.
Manufactured by M50110 is used. This signal generation circuit 2
01 is the key input terminal _I6 and the scan output terminal _φA ,
A preprogrammed frequency code signal corresponding to the closure of φ _B and φ _D is generated on a carrier wave of several tens of kilohertz twice each at the output terminal OUT. 2
02 is an external ceramic resonator circuit that provides a reference clock signal to the signal generating circuit 201.

Reference numeral 203 denotes a superimposition circuit, which includes a known current amplification circuit 2031 and a capacitor 203 composed of a resistor, a transistor, and a Zener diode for surge absorption.
2, the frequency code signal inputted from the signal generating circuit 201 is current amplified, superimposed on the DC current path 6 through AC coupling by a capacitor, and transmitted to the vehicle body B.

Reference numeral 204 denotes a voltage stabilization circuit, which accumulates charge from the load side terminal of the switch 5 into a capacitor 2043 via a diode 2040 and a resistor 2041 when the open/close switch 5 is open, and at the same time accumulates charge in a capacitor 2043 via a diode 2040 and a resistor 2041.
A constant voltage Vr is generated by a constant voltage circuit consisting of a signal generating circuit 201 and a superimposing circuit 203.
supply to.

A receiving circuit 3 is installed in the vehicle body B.
This receiving circuit 3 is operated by being supplied with power from an on-vehicle battery 8, picks up only the frequency code signal superimposed by the transmitting circuit 2 from the DC current path 6 going from the steering wheel H to the alarm 7, and also picks up the frequency code signal. The signal is decoded to generate an electric signal corresponding to the closing of each of the electric switches 1a, 1b, 1c, and is applied to the electric device 4, for example, a constant speed cruise control device.

In the receiving circuit 3, 301 is a frequency signal extraction circuit, and the frequency code signal applied to the DC current path 6 is transmitted through a capacitor 3010 and a resistor 3011.
The signal is extracted by a known AC coupling circuit consisting of the following, and input to the signal shaping circuit 302.

The signal shaping circuit 302 includes resistors 3020 and 302.
The frequency code signal extracted by the frequency signal extraction circuit 301 is inverted and shaped and input to the signal decoding circuit 303.

The signal decoding circuit 303 is M50111 manufactured by Mitsubishi Electric Corporation.
is used to receive the frequency code signal output from the signal shaping circuit and generate preprogrammed decoding signals at data output terminals D ₀ , D ₁ , D ₂ . Here, the signal generating circuit 201 and the signal decoding circuit 303 output terminals when the frequency code signals generated from the signal generating circuit are input twice in agreement when the electric switch 1a in the operating device 1 is closed. _Similarly , when the electric switch 1b is closed, the output terminal _D1 is programmed to be high level, and when the electric switch 1c is closed, the output terminal _D2 is programmed to be high level. ing.

304 is an external ceramic resonator circuit attached to the signal decoding circuit 302.

305 is a transistor switching circuit which amplifies the output signals generated at the output terminals D ₀ , D ₁ and D ₂ and applies the amplified signals to the electric device 4 . 306 is a power-on reset capacitor, 307 is a diode,
A constant voltage V _R is generated using a known power supply circuit composed of a resistor, a Zener diode, and a capacitor.

Note that when the electrical device 4 has a switch (ignition switch or independent operating switch) for switching between supplying and stopping power from the on-board battery 8, that switch and a switch for supplying power from the on-board battery 8 to the receiving circuit 3 (Fig. (not shown) can be configured to work together.

FIG. 2 is an output waveform diagram of each part of the frequency code signal, where a is the signal generation circuit 201, b is the frequency signal extraction circuit 301, and c is the signal shaping circuit 302.
This is the output waveform of

As shown in FIG. 2, the frequency code signal is converted into an inverted and smoothed waveform and sent to the signal decoding circuit 303.
is input.

In the above configuration, when the electric switches 1a, 1b, 1c of the operating device 1 are closed, a predetermined frequency signal corresponding to each switch is transmitted to the vehicle body B via the DC current path 6. The vehicle body B decodes the frequency signal and generates electrical signals corresponding to the switches 1a, 1b, 1c, which are applied to the electrical device 4. The electrical device 4 is thus controlled by an electrical switch on the steering gear H. Note that when the on-off switch 5 is closed to activate the alarm, the transmitting circuit 2 cannot transmit a frequency signal through the DC current path 6, but when the on-off switch 5 is closed and then opened, the voltage stabilizes. Due to the charge accumulated in the capacitor 2043 in the conversion circuit 204, the transmitting circuit 2 is immediately activated and signal transmission becomes possible.

As described above, in the present invention, the DC current path for the horn that electrically connects the steering gear and the vehicle body is also used to transmit frequency signals corresponding to multiple electric switches. Furthermore, since the structure is configured to also feed power to the transmitting circuit added to the steering device, there is an excellent effect that signal transmission is ensured and there is no need to add extra electrical wiring to the vehicle for this purpose.

Furthermore, since both the frequency code signal superimposition means on the DC current path in the steering system and the frequency code signal extraction means on the vehicle body side use AC coupling using capacitors, special parts such as electromagnetic coupling are not required, and the DC current The work is easy as there is no need to insert any parts into the path.

[Brief explanation of the drawing]

FIG. 1 is an electrical wiring diagram showing an embodiment of the present invention.
FIG. 2 is a waveform diagram showing waveforms at various parts in FIG. 1. DESCRIPTION OF SYMBOLS 1... Operating device, 1a, 1b, 1c... Electric switch, 2... Transmission circuit, 201... Signal generation circuit, 203... Superimposition circuit, 204... Voltage stabilization circuit, 3... Receiving circuit, 301 ...Frequency signal extraction circuit, 302...Signal shaping circuit, 303...Signal decoding circuit, 5...Opening/closing switch, 6...DC current path, 7...Warning horn, B...Vehicle body, H...
Steering gear, R...Rotation transmission mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] The vehicle has a steering device that protrudes from the front of the vehicle interior toward the inside of the vehicle interior and is rotatably supported by the vehicle body, and furthermore, this steering device is given a command to operate an alarm. The on-off switch is connected to the vehicle body side power source and the alarm load by a DC current path, and changes in the DC current caused by opening and closing of the on-off switch are In the automotive switch device configured to be detected on the vehicle body side, the steering device includes a plurality of electric switches arranged so that operated parts thereof are exposed on the inside of the vehicle; signal generating means that generates a frequency signal containing information components corresponding to each operation of the switch; and a signal generating means that is connected to the DC current path by AC coupling via a capacitor and that responds to the frequency signal generated from the signal generating means. a superimposing means that includes a semiconductor switch element that performs switching operation and superimposes its frequency signal on the DC current path; and power is supplied from the DC current path in parallel to the on/off switch and converts it into a stable DC voltage to generate the signal. and a voltage stabilizing means for operating the superimposing means, and on the vehicle body side, an extracting means for extracting the frequency signal superimposed on the DC current path using an AC coupling capacitor; A switch device for an automobile, characterized in that it is equipped with a decoding means for decoding a frequency signal.