JPH05345551A - Automobile switch device - Google Patents

Abstract

PURPOSE:To provide an automobile switch device which can prevent malfunctioning caused by an external noise when a signal is transmitted between a steering and a car body and enables bidirectional signal transmission to be effected. CONSTITUTION:In addition to a DC current passage 6 which is an alarming horn line, a DC current passage 4 is provided between a steering H and a car body B. The DC current passage 4 is used to transmit frequency code signals from the steering H from a transmission circuit 203 to a car body B after AC coupling in a superposed circuit 2032 and to transmit signals corresponding to these signals from the car body B by varying the electric potential of the DC current passage 4 by means of a potential-variable circuit 305. This simple constitution allows signals to be transmitted bidirectionally without being affected by external noises.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch device for an automobile applicable to applications such as instructing setting and cancellation of a constant speed running control device and an air conditioner.

[0002]

2. Description of the Related Art Generally, in a switch device for an automobile, only a horn switch is arranged on the upper surface of a steering wheel, some other switches are mounted on a steering column, and the other switches are arranged on an instrument panel. ..

However, it is desirable that the switches to be operated while the vehicle is traveling, such as the constant-speed traveling control device and the air conditioner, can be operated while touching the steering wheel, and they are in a position where they can be recognized instantaneously. Is desirable.

However, since the steering device is rotatably attached to the vehicle body, it is not easy to attach switches to the steering device. Speaking of the horn switch described above, in order to electrically connect the horn switch mounted on the body of the vehicle and the horn switch on the steering wheel, for example,
A direct current path including a contact ring is provided.

However, providing such a direct current path for each switch when attaching other switches leads to structural complication of the device, and further,
There is a problem that reduces the reliability of the device.

[0006] In order to eliminate such problems,
In the switch device described in JP-A-2-32920,
A transmission circuit that also serves as a DC current path for a horn that electrically connects the steering device and the vehicle body to transmit a frequency signal corresponding to a plurality of electric switches and further adds the transmission circuit to the steering device. There has been proposed a configuration for supplying power to the.

[0007]

However, in this method, the operation signal on the steering wheel side is transmitted to the device on the vehicle body side in a single direction, and the device on the vehicle body side responds to this signal. There is no bidirectional signal transmission means for the signal from the steering wheel to the steering wheel without causing structural complexity of the device and deterioration of reliability.

Further, since the power for the steering device is supplied from the horn line, signals cannot be transmitted during the operation of the horn. Furthermore, since the horn is outside the vehicle compartment, external noise is likely to enter this line, and superimposing a frequency signal on this line may cause a malfunction.

The present invention has been made in order to solve the above problems, and can prevent malfunction due to disturbance noise, and at the same time, without complicating the structure of the apparatus and reducing reliability. The purpose of the present invention is to obtain a switch device for automobiles that enables signal transmission in the same direction, and in addition to the function of preventing malfunction due to external noise,
(EN) Provided is a switch device for an automobile, which is capable of transmitting a signal even during operation of a horn, and capable of transmitting a signal in both directions without causing structural complexity of the device and deterioration of reliability. It is an object.

[0010]

A vehicle switch device according to the present invention is coupled to a dc line separately from a horn line, and is rotatably projecting from a front portion of a passenger compartment toward the inside of the passenger compartment. The steering device supported by the body, the signal generating device disposed on the steering device side for generating a frequency signal containing an information component corresponding to each operation of the electric switch, and the signal generating device disposed on the steering device side. Transmission means that performs a switching operation in response to the generated frequency signal and potential changing means that is disposed on the vehicle body side and that changes the potential of the horn line are provided.

Further, a steering device which is connected to a dc line separately from the horn line and which is rotatably supported by the vehicle body so as to protrude from the front part of the vehicle interior toward the interior of the vehicle, and the steering device side. Signal generating means for generating a frequency signal including an information component corresponding to each operation of the electric switch,
Transmitting means that performs switching operation in response to the frequency signal generated by the signal generating means, superimposing means that superimposes the frequency signal on the direct current path, and the electric potential of the direct current path of the superimposing means that is disposed on the vehicle body side and is varied. And a potential changing means.

[0012]

The frequency signal containing the information component corresponding to each operation of the electric switch disposed on the steering wheel side of the automobile switching device configured as described above is generated by the signal generating means and transmitted by this frequency signal. The switching means operates to transmit a frequency signal from the steering wheel side to the vehicle body side through a direct current path to the vehicle body side, and from the vehicle body side, the potential varying means changes the potential of the horn line according to the frequency signal. Then, the signal is transmitted to the operating device side.

Further, the signal generating means generates a frequency signal containing an information component corresponding to each operation of the electric switch arranged on the steering wheel side, and the transmitting means performs a switching operation by the frequency signal, and the frequency signal is changed. The superimposing means superimposes it on the DC current path and transmits it to the vehicle body side. On the vehicle body side, the potential varying means changes the electric potential of the DC current path to transmit a signal from the vehicle body side to the steering wheel side. Signals can be transmitted bidirectionally between the steering wheel side and the vehicle body side while the horn is being operated, and power is also supplied to the circuit added to the steering wheel.

[0014]

【Example】

First Embodiment FIG. 1 is a circuit diagram showing a configuration of a first embodiment of the present invention.
This corresponds to the invention of claim 2. In FIG. 1, the steering wheel H protrudes from the front of the passenger compartment toward the passenger compartment,
It is supported by the vehicle body B via a known rotation transmission mechanism R.

The steering wheel H includes an opening / closing switch 5 including a normally open contact for instructing the operation of a horn and an operating device 1 including a plurality of electric switches 1a, 1b and 1c on the inside of the vehicle. The operated part is exposed so that the steering device H
Mounted above with sufficient spacing. The open / close switch 5 is connected to a horn 7 and a vehicle-mounted battery 8 in the vehicle body B via a DC current path 6 including a known contact ring 6a. The direct current path 6 serves as a horn line.

When the open / close switch 5 is closed, the on-vehicle battery 8 passes through the direct current path 6 and the open / close switch 5,
The horn 7 is energized and sounded by the direct current path flowing to the body ground.

Further, a transmission response circuit 2 is attached to the operating device H, and the transmission response circuit 2 is operated by being supplied with power from the voltage stabilizing circuit 204 via the direct current path 4 and operating. , 1b, 1c corresponding to the open / close signals, a frequency code signal (a frequency signal including an information component corresponding to the open / close signals) is generated, and superposed on the DC current path 4 via a capacitor to generate electricity on the body B side of the vehicle body. It is configured to be transmitted to the device and to be activated and respond to the potential of the direct current path 4.

In the transmission response circuit 2, 201 is a signal generating circuit for generating a frequency code signal corresponding to the switch when the electric switches 1a, 1b, 1c are closed, and 202 is a standard clock signal for the signal generating circuit 201. An external ceramic oscillator for giving a signal 203 is a transmitting circuit. This transmission circuit 203 is composed of a known current amplification circuit 2031 composed of a resistor, a transistor and a Zener diode for surge absorption, and a superposition circuit 2032 composed of a capacitor, and current-amplifies the frequency code signal input from the signal generation circuit 201. It is superimposed on the DC current path 4 by AC coupling by a capacitor and transmitted to the body B of the vehicle body.

Reference numeral 204 is a known voltage stabilizing circuit, which is connected to the DC current path 4 and generates a constant voltage, which is supplied to the signal generating circuit 201, the transmitting circuit 203, and the potential response circuit 205. The potential response circuit 205 includes resistors 2051, 2052, 2054 and a transistor 205.
3. The light emitting diode 2055 is configured to receive the potential change of the DC current path 4 by the resistors 2051 and 2052, and when the potential exceeds a certain potential, the transistor 2053 operates and the light emitting diode 2055 is turned on through the current limiting resistor 2054. I am trying.

A reception command circuit 3 is provided in the vehicle body B. The reception command circuit 3 is powered by an on-vehicle battery 8 to operate, and a direct current path 4 from the steering wheel H to the reception command circuit 3 is provided. While picking up only the frequency code signal superposed by the transmission response circuit 2, the frequency code signal is decoded and each electric switch 1a, 1
generates an electric signal corresponding to the closing of b and 1c, for example,
This signal is given to the constant speed traveling control device, and the electric potential according to the frequency signal is transmitted to the transmission response circuit 2, so that the electric potential of the DC current path 4 is changed by the electric potential changing circuit 305.

In the reception command circuit 3, the voltage stabilizing circuit 301 generates a constant voltage and supplies a diode, a resistor, a zener diode, a capacitor to the reception circuit 302, the signal decoding potential variable command circuit 303, and the potential variable circuit 305. It is composed of a known power supply circuit 3011 configured by and a series resistor 3012 for supplying power to the DC current path 4 and varying the potential.

The receiving circuit 302 has a frequency extracting circuit 3022 for extracting a frequency code signal by an AC coupling circuit, and a signal decoding potential variable command circuit 303 for inverting and shaping this signal.
The signal shaping circuit 3021 for inputting to

The signal decoding variable command circuit 303 uses HD63BOIY manufactured by Hitachi, Ltd., and has a terminal P2.
At 0, the frequency code signal is received, a pre-programmed decoded signal is given to, for example, the constant speed running control device, and a potential variable command corresponding to the frequency code signal is output from the terminal P50 to the potential variable circuit 305. An external ceramic oscillator circuit 304 is attached to the signal decoding potential variable command circuit 303.

The potential variable circuit 305 includes resistors 3051 and 3
052, 3055, a transistor 3054, a surge absorbing zener diode 3056, and a potential variable command output from the terminal P50 of the signal decoding potential variable command circuit 303. In this embodiment, the potential variable command changes from the high level to the low level and the transistor 3054 Is switched from on to off, the potential of the DC current path 4 divided by the series resistor 3012 and the resistor 3055 rises, and a signal is transmitted from the device on the vehicle body B side to the device on the steering wheel H side.

FIG. 2 shows the DC current path 4 in the embodiment of FIG.
2 (b) is a voltage waveform diagram of the transistor 30. The potential variable command output from the terminal P50 of the signal decoding potential variable command circuit 303 changes from the high level to the low level.
54, the potential of the DC current path 4 which is divided by the series resistor 3012 and the resistor 3055 rises, and then the transistor 3054 is turned off to lower the potential. FIG. 3B shows the electric switches 1a, 1b, 1 in the state of FIG.
FIG. 3 shows a waveform diagram when c is closed, the frequency code signal is superimposed on the DC current path 4, and is transmitted to the vehicle body B.
FIG. 3C is an enlarged view of the waveform of the portion of the circle 300 in FIG.

Second Embodiment FIG. 3 is a circuit diagram showing the configuration of the second embodiment. The second embodiment corresponds to the invention of claim 1. In the embodiment of FIG. 3, the potential response circuit 205 and the potential variable circuit 305.
Is connected to the DC current path 6 which is a horn line, and a change in the potential of the DC current path 6 causes a signal to be transmitted from the device on the vehicle body B side to the device on the steering wheel H side. In the change, the limiting resistor 9 is inserted between the in-vehicle battery 8 and the horn 7 so that the horn does not ring. Further, the DC current path 4 does not pass through the superposing circuit 2032 formed of a capacitor as in the first embodiment of FIG.
The frequency code signal from the direct transmitting circuit 203 is directly coupled to the receiving circuit 302 by DC coupling. Therefore, the frequency signal extraction circuit 3022 extracted by the AC coupling circuit shown in FIG. 1 is omitted in the reception circuit 302.

FIG. 4 is a voltage waveform diagram of the DC current paths 4 and 6 of the second embodiment of FIG. 3, and FIG. 4A shows the potential variable command output from the terminal P50 of the signal decoding potential variable command circuit 203. From high level to low level, the transistor 3054 is switched from on to off, the potential of the direct current path 6 which is divided by the limiting resistor 9, the alarm device 7 and the resistor 3055 is raised, and then the transistor 3054 is turned off. It is a diagram in which the potential is lowered and the open / close switch 5 is closed, so that the potential becomes 0V. FIG. 4B shows a waveform diagram when the electric switches 1a, 1b, 1c are closed and the frequency code signal is transmitted to the vehicle body B from the direct current path 4.

[0028]

Since the present invention is configured as described above, it has the following effects.

A DC current path is provided between the steering wheel and the body of the vehicle separately from the horn line, and frequency signals corresponding to a plurality of electric switches on the steering wheel side are transmitted to the vehicle body side to prevent external noise. In addition to preventing the erroneous operation of the vehicle body, the signal from the vehicle body side to the steering device side is transmitted by changing the potential of the horn line by the potential variable circuit, and this signal is detected by the potential response means provided in the steering device. By responding, it is possible to transmit signals bidirectionally between the steering device and the vehicle body body without causing structural complexity of the device and deterioration of reliability.

Further, a DC current path is provided between the steering device and the body of the vehicle separately from the horn line so that frequency signals corresponding to a plurality of electric switches can be transmitted from the steering device to a device on the body of the vehicle. In addition to preventing malfunction due to external noise, signal transmission from the vehicle body to the steering wheel side is also superposed on this DC current path in response to this frequency signal, and this signal is connected to the DC current path by potential response means. It is possible to detect and to supply power to the circuit to be added to the steering device from the direct current path so that the bidirectional signal transmission between the steering device and the vehicle body can be performed even while the horn is operating. It does not cause structural complication and decrease in reliability.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a vehicle switch device according to a first embodiment of the present invention.

2 is a signal waveform diagram of a DC current path 4 in FIG.

FIG. 3 is a circuit diagram showing a configuration of a vehicle switch device according to a second embodiment of the present invention.

FIG. 4 is a signal waveform diagram of DC current paths 4 and 6 in FIG.

[Explanation of symbols]

 1 Operator 1a Electric Switch 1b Electric Switch 1c Electric Switch 2 Transmission Response Circuit 201 Signal Generation Circuit 202 External Ceramic Vibrator 203 Transmission Circuit 204 Voltage Stabilization Circuit 205 Potential Response Circuit 3 Reception Command Circuit 301 Voltage Stabilization Circuit 302 Reception Circuit 303 Reception Decoding Potential Variable Command Circuit 304 External Ceramic Vibrator 305 Potential Variable Circuit 4 DC Current Path 5 Open / close Switch 6 DC Current Path 7 Alarm Sounder 8 Car Battery 9 Limiting Resistance B Body Body H Steering Wheel R Rotation Transmission Mechanism

Claims (2)

[Claims] 1. A vehicle body, which protrudes from a front portion of a vehicle compartment toward a vehicle interior side and is rotatably supported by a vehicle body,
A steering unit connected to the horn line and a direct current path on the body side of the vehicle body, and a steering unit attached to the steering unit so that the operated portion is exposed to the inside of the vehicle, and commands the steering unit to operate the warning unit. An opening / closing switch, an electric switch attached to the steering device for instructing the operation of an electric device so that the operated part is exposed to the inside of the vehicle, and an electric switch arranged on the steering device side. Signal generating means for generating a frequency signal containing an information component corresponding to each operation, and switching operation in response to the frequency signal generated by the signal generating means disposed on the steering wheel side and transmitted to the vehicle body side. Transmitting means for operating the semiconductor switch element, which detects a potential signal which is arranged on the side of the steering wheel and changes according to the electric switch from the direct current path, and which responds by operating the semiconductor switch element. Receiving means arranged on the body body side for receiving the frequency signal transmitted from the transmitting means, potential changing means arranged on the body body side for varying the potential of the horn line, and the body body side Signal decoding potential variable command means for decoding the frequency signal received by the receiving means and for giving a command to the potential varying means for varying the potential of the horn line according to the operation of the electric switch. An equipped switch device for automobiles. 2. A vehicle body that protrudes from the front of the vehicle compartment toward the vehicle interior and is rotatably supported by the vehicle body.
A steering unit connected to the horn line and a direct current path on the body side of the vehicle body, and a steering unit attached to the steering unit so that the operated portion is exposed to the inside of the vehicle, and commands the steering unit to operate the warning unit. An opening / closing switch, an electric switch attached to the steering device for instructing the operation of an electric device so that the operated part is exposed to the inside of the vehicle, and an electric switch arranged on the steering device side. Signal generating means for generating a frequency signal containing an information component corresponding to each operation, and switching operation in response to the frequency signal generated by the signal generating means disposed on the steering wheel side and transmitted to the vehicle body side Transmitting means, a superposing means arranged in the steering device for superposing a frequency signal transmitted from the transmitting means on the direct current path, and changing according to an operation of the electric switch arranged on the steering device side. Potential response means for detecting a potential signal from the direct current path to which the superimposing means is connected and activating the semiconductor switch element to respond, and a frequency signal disposed on the vehicle body side and superposed on the direct current path. Receiving means for extracting and receiving by using an AC coupling capacitor,
A potential changing means arranged on the body side of the vehicle body for changing the potential of the direct current path on which the frequency signal is superimposed by the superposing means, and a frequency signal received by the receiving means arranged on the body body side. A switch device for an automobile, comprising signal decoding potential variable command means for decoding and for commanding the potential variable means to vary the potential of the DC current path according to the operation of the electric switch.