JPS59160328A - On-vehicle display device - Google Patents

Abstract

PURPOSE:To prevent the structure of a steering wheel part from becoming complicate and increasing in capacity by arranging a key switch and a surface display device on a steering operation board and providing only a demodulator which demodulates display information and a modulator which outputs key input information on the operation board. CONSTITUTION:A constant voltage power source device 70, microcomputer unit (CPU1) 80 which controls operation on the steering operation board, key switch 90, FSK modulating and demodulating circuits 100 and 110, microphone MC, differential amplifier DFA, FM modulator, monitor television TV as the surface display device, tuner TU, distributor 190, etc., are arranged on the steering operation board. Further, other circuits or a control unit is provided on the side of a vehicle body and both are connected together by an electric connecting means consisting of two brushes for a signal and a power source and a slip ring.

Description

[Detailed Description of the Invention] The present invention provides a vehicle that displays various numerical information, two image information, etc.
-Regarding a display device, in particular, it relates to an on-vehicle display device in which a surface display is placed on or near a steering wheel that is easy for the driver to see.

In a vehicle, the steering wheel is the closest to the driver, and is also closest to the driver's hands, so in order to improve operability, it is necessary to install an operation board, display, etc. equipped with key switches for controlling on-board equipment. is preferably installed in the center of the steering wheel.

Also, to display a large amount of information or image information, use a cathode ray tube display (CRT) as a display device! (7) Although it is preferable to use a surface display, it is difficult to secure a large space for displaying there because many devices are generally already installed near the driver's seat.

Therefore, this type of display has no choice but to be small, but if the display is made small, it becomes difficult to see the display, so it is better to place the display on the steering wheel near the driver. However, since the space above the steering wheel is limited, only the minimum necessary equipment such as a key switch and surface display can be installed in that area.

By the way, when adopting such a configuration, a large amount of information must be transmitted between the steering operation board and the vehicle body, but since the steering mechanism that transmits wheel rotation to the steering shaft is complex, the steering It is difficult to wire the signal cable and power supply that connect the operation board (steering operation board) installed in the center of the wheel and the fixed control unit. A connection mechanism that combines slip rings and brushes can be used to wire the wires without interfering with the rotation of the steering wheel, but a large number of slip rings and brushes are required to transmit a wide variety of information. This kind of wiring is quite difficult in the case of a steering mechanism which has a complicated structure and requires a large space for its connection mechanism, and where the allotted space is limited.

The first object of the present invention is to arrange a surface display near the steering wheel so that the display contents can be clearly seen even if the display surface is small, and to prevent the structure of the steering wheel from becoming complicated and bulky. A second purpose is to simplify the configuration of the connection mechanism that connects the main body of the device and the steering operation board.

In order to achieve the object described in item 1, in the present invention, a key switch and a surface display are arranged on the steering operation board, and a television camera that outputs display information, a character display device, etc. are arranged on the main body side of the steering wheel. A demodulator that demodulates display information and a modulator that outputs key human power information are installed on the operation board, and a demodulator that demodulates key human power information and a modulator that outputs display information are installed on the main body of the device. The modulated wave obtained from the display information and the modulated wave obtained from the display information are set to different frequencies, and these signals are placed on the same transmission path. Furthermore, a transmission path for power transmission is provided separately from the signal transmission path, and this connects the power line on the device main body side and the power line on the steering operation board.

When placing the surface display on the steering operation board,
If the surface display rotates as the steering wheel rotates, the display becomes difficult to see. Accordingly, in one preferred embodiment of the invention, the steering control board is raised above the steering wheel, and at least two sets of electrical connection mechanisms consisting of slip rings and brushes are provided.
One side is used to connect the steering wheel to the vehicle body side, and the other side is used to connect the steering wheel to the steering link operation board. According to this, the display surface does not tilt even when the steering wheel is tilted, so when displaying an image from a television camera pointing toward the rear of the vehicle to check the rear, for example, the driver can turn the steering wheel while looking at the display. You can cut it off and park it in the garage.

When installing a telephone, radio, etc. in the driver's car, it is recommended that the microphone be fixed, as it is dangerous if the driver takes his hands off the steering wheel while driving. It is better to place it close to the steering wheel. Therefore, in one preferred embodiment of the present invention, the steering control buttons 1 to 1
A microphone and an analog modulator connected to its output are provided on the top, an analog demodulator is provided on the main body side of the device, and the demodulated output is applied to a telephone or the like.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of an embodiment device. This will be explained with reference to FIG. In this example, the steering operation board includes a constant voltage power supply 70. The microcomputer that controls the steering operation board - L Niso h80 (CP
U I), key yf90°FSK modulation/demodulation circuit Jo
o, 11o, microphones MC, MC2, differential amplifier DFA, FM modulator 95. Two screen displays, namely monitor televisions 1, V1, TV2. Tuner TUI, GO”
U2. A distributor 190 and the like are provided.

Microphones MCI and MC2 are arranged facing the same direction (toward the mouth of the 1-lough r bar) at a predetermined interval, and their output terminals are connected to different input terminals of the differential amplifier DFA. be. As a result, microphone M (,
Since the difference between the sound applied to I and the sound fL applied to MC2 is amplified by the DFA, a large effect can be obtained for the sound coming from the arrangement direction of MC1 and MC2, that is, from the direction of the driver. -), noise from the side is canceled out, and only the signal corresponding to the driver's voice is greatly amplified and applied to the I'M modulator 95.

In this embodiment, the control unit on the vehicle body side includes a constant voltage power supply device 120. Microcomputer Unino l-13
0 (cpU2), FSK modulation/demodulation circuit 150.160. F
M demodulation circuit J70. Telephone T, ET-.

Mobile device or telephone radio communication device T RX , branch connection circuit 180 . Amplifier AMP, speaker SP, display microcomputer Units 1-200 (CPU
3), Hideorum VRA old, VllAM2. Modulator 2
]0.220. It is equipped with a 1" VC TV camera, 230 mixers, etc.

The transmission path 250 includes a connection mechanism consisting of a slip ring SA and a brush BA1, a slip ring SA2, and a brush BA2.
The signal system of the steering operation board and the signal system of the vehicle body are connected through a connection mechanism consisting of: In addition, the transmission line 260 connects the power line of the steering control board i and the power line of the vehicle body through a connection mechanism consisting of the slip link 5131 and the brush BBI, and a connection mechanism consisting of the slip link S B 2 and the brush BB2. Connected. The transmission line 250 is equipped with a shield mechanism as described later.

On the steering boat, the FSK modem circuit 10
0,110. FM modulation circuit 95 and distributor 190 are each connected to transmission line 250 via a capacitor,
Further, a stabilized power supply circuit 7o is connected to the transmission line 260. On the vehicle body side, an FS K modulation/demodulation circuit 150. l
GO, FM demodulation circuit 170 and mixer 230 are each connected to transmission line 250 via a capacitor, and one end of a power switch SW that operates in conjunction with stabilized power supply 120 and the ignition key switch is connected to transmission line 260.

Fig. 2a shows the vicinity of the driver's seat of a vehicle equipped with the device shown in Fig. 1, and Fig. 2b shows the appearance of the vicinity of the steering wheel. This will be explained with reference to FIGS. 2a and 2b. A telephone TEL is placed on the left side of the driver's seat (~), and a speaker SP is placed in front of it.

A steering operation board 4 is provided at the center of the steering wheel 3 and is placed floating above the steering wheel 3. On the front panel 5 of the steering operation board 4, there are two monitor TV screens, a display screen for TV2, a rear confirmation key, a fuel key, and a speed key.

Call/off key, telephone numeric keypad, hold key,
Clear key etc. are exposed. In this embodiment, flat cathode ray tube display devices manufactured by Sony Corporation are used for the monitor televisions TVI and TV2.

FIG. 2C shows a schematic diagram of the structure of the steering wheel 3, the steering operation board, and the vehicle body. This will be explained with reference to FIG. 2C. The sabot 1-38 is fixed to the support 41 and rotatably supports the gear 39. The gear 39 is fixed to the vehicle body. The support 1-41 is fixed to the steering shaft 40, and the steering wheel 3 is connected to the support 1-41. Support 41 rotatably supports gears 39 and 42.

A connecting member 43 has gears 43a and 43b having the same number of teeth at both ends, and is rotatably supported by the support 41. Gears 43a and 43b are gear 3, respectively.
9 and 42).

The printer 1 board 44 of the steering operation board and the operation panel 5 are fixed to the gear 42. Gears 39 and 4
The number of teeth in 2 is equal. With this configuration,
In this embodiment, when the steering wheel 30 is rotated, the operation panel 5 etc. do not rotate by 1°, and when the steering wheel 3 is rotated, the sabot 1-41 and the steering shaft 40 are rotated to perform the steering operation. However, since the gears 43a and 43b and 39 and 42 have the same number of teeth, the support 41 caused by the arcuate movement of the connecting member 43 due to the rotation of the sabots 1-41
and the relative movement amount (angle) of the gear 39 and the support 41
The amount of relative movement between the gear 42 and the gear 42 becomes equal, and since the gear 39 is fixed and the gear 42 does not rotate relative to the gear 39, the operation panel 5 does not rotate even if the steering wheel 3 rotates. %N.

The steering wheel 3 is equipped with brushes BAI-BA2 and 13B1-1332 which are electrically connected to each other. The brushes BAI and BBJ each have a slip ring S with one end located on the steering operation board side.
It is in contact with AI and SBI, and brushes BA2 and B
B2 is in contact with slip rings SA2 and SB2, each of which has one end fixed on the vehicle-mounted side. Slip rings SAI and SBI and slip rings SA2 and SB
2 have different diameters and are arranged concentrically around the shaft 40. slip ring SAI
and SA2 are provided with electromagnetic shielding.

FIGS. 2d and 2e show details of the structure near the slip ring SAl. The explanation will also be made with reference to FIGS. 2d and 2e. The slip ring SA1 is attached to a recessed portion of a resin insulator plate 1-51 having four parts of a predetermined width formed into a ring shape, and conductor shield plates 52 and 53 are attached so as to surround the plate 51. The shield plate 53 is connected to the grooves 51a and 5 of the insulator plate 51.
It is fixed at 1b. The brush BAI has a resin collar 54 attached to its tip, and a hole 53 of the shield plate 53.
a, and is constantly in contact with the slip ring SAI due to the suppressing force of the compression coil spring SP1.

The shield plate 52 is electrically connected to the gear 42, and the shield plate 53 is electrically connected to the steering wheel 3, thereby grounding the vehicle body. The vicinity of slip ring SA2 and brush BA2 has a similar configuration, and the two shield plates 1 and (
(not shown) are grounded to the steering wheel 3 and the steering shirt 1-40, respectively. Slip rings SB1 and SB2 are arranged on the inner peripheral side of slip rings SA1 and SA2, respectively, but are not equipped with a shield plate.

FIG. 3a shows the configuration of the electric circuit on the steering operation board. This will be explained with reference to FIG. 3a.

The key switch 90 is connected to three output ports P20. of the microcomputer CPU1. It is composed of a large number of key switches connected to P21 and P22 and eight input ports 1-DBO to DB7 in a 71-box configuration. These key switch contacts are opened and closed by operating predetermined portions on the operation panel 5.

Although the FSK modulators 100 and 110 are 1-deep integrated circuits in this example, their internal configurations are as shown in FIG. 3b in detail. ,l.

O is an FSK modulator, and 110 is an FSX demodulator.

Note that Zl shown inside the FSX modem 100, 11.0,
z2 and Z3 are MCI manufactured by Sen1-Laura Rei, respectively.
4040. This counter has functions equivalent to MCI4018 and MCI4040.

Other elements are general D type flip-flops, J
- Flip-flops, Nant gates, inverters, etc.

The terminal CLOC is an input terminal for a clock pulse that determines the reference timing of transmission, the terminal DTN is an input terminal for binary data to be transmitted, the terminal sw is an input terminal for a signal that controls the output of the FSK signal, and the terminals DOLC and Do 1-I A is a modulated signal output terminal, terminal SIN is an FSK signal input terminal, and 5OUT is a demodulated binary data output terminal.

terminal C0LC of FSK modem too, 110;

DiN, SW and SOLJ T are each CPU
1 ports PI], PIO, ALE and 'I'0, and complementary output transistors Ql and Q2 are connected to the modulation output terminals DOLC and DOHA. The output lines from the 1-run listers Ql and Q2 are connected to the transmission line leading to the slip ring SAI via resistors and capacitors. The FSK signal input terminal SIN of the modem 100.110 is connected to the Schmidts 1-trigger STI
It is connected to. The input end of the STI is connected to a transmission line leading to the slip ring SAI via a capacitor and a resistor.

A buzzer BZ is connected to the output port P14 of the microcomputer CPUI via an inverter, and relays RLI and RL2 are connected to the output ports PL5 and PI3 via inverters, respectively.

The two output ends of the distributor 190 are connected to the tuner 1 connected to the monitor TV 'I'71 9 and TV 2, respectively.
"tJ] and 'l' U2. Tuners TU1 and 'J"U2 are connected to modulator 2, respectively.
10 and 220. Tuner']'U], TU
The input end of the stabilized power supply circuit that supplies power to 2 and the monitor televisions I-V I, i'V 2 is connected to the relay RL.
It is connected to the power supply line through two contacts.

The contacts of relay RI, 1 are connected to the input terminal of a stabilized power supply that supplies power to the audio signal circuit and to the 12V power supply line.

Mitalophones MCI and MC2 are connected to a differential amplifier D'FA formed of an operational amplifier. Differential amplifier 1
．． 1) A bypass filter configured using an operational amplifier is connected to the output end of the FA.
A low-pass filter L (I) F constructed using an operational amplifier is connected to the output terminal of the I-pass filter. The output signal of the low-pass filter Ll'F is amplified by the amplifier AMI and then connected to the input terminal Δ of the FM modulator FM~1 via a capacitor.
applied to u d , i o j, n. A predetermined DC bias voltage is applied to the input terminal Audjo jn of the FMM through a variable resistor VRI. Variable resistor VR] is
This is to set the center frequency of the FM modulated wave. F M
The modulator FMM is configured as a one-chip integrated circuit, and the FM modulation circuit 95 includes the FMM and electric coils and capacitors connected to each terminal thereof.

It consists of resistors, etc. The output end of the FM modulator FMM is connected to a transmission line leading to the slip ring SA1 via a capacitor.

Figures 4a and 4b show the electrical circuit of the device on the vehicle body side. This will be explained with reference to FIGS. 4a and 4b. The microcomputer CPU2 is connected to FSK modulators 150 and 160 having the same configuration as the modulators 100 and 110 shown in FIG. 3b. FSK modulator 1
The output terminal of the FSK demodulator 160 and the input terminal of the FSK demodulator 160 are connected to a slip ring SA2 via an output circuit including a driver and an input circuit including a Schmidts trigger.
It is connected to.

The input end of the FM demodulation circuit 170 is connected to the slip ring SΔ2. The FM demodulation circuit 170 includes a ceramic filter CFT, one integrated circuit FM for demodulating the FM signal,
It is composed of a low frequency amplifier AM4 and the like. -The power of the FM demodulation circuit 170 is supplied through the contacts of the relay RL3. The output terminal of the FM demodulation circuit 170 is relay 'R,T.
-5 contact point.

The amplifier ΔMP connected to the speaker SP is connected to the clipper CL
P, a low frequency amplifier AM2, and a power amplifier PΔ. The power amplifier PΔ is output 1-lanceless (OT
+-,) 4M configuration. The input of the amplifier A Ml) is connected to one of the relays RL 2, at a key point.

The other port 1- of the microcomputer CPU2 has a branch 1 random connection circuit 180. Horn drive relay R1,
, G to control the inverter and the buzzer BZ (connect the inverter).The branch connection circuit 180 includes the telephone TEL, the mobile device TRX, and the FM demodulation circuit. 170 and an amplifier AMP.

In the telephone TEL block, one is the dial code output terminal, Cl" is the 1200 baud clock pulse output terminal, PS is the power on/off control input terminal, and CI is the restriction instruction signal (rOJ: call available, 11 .J: Unable to talk) input terminal, 1-IK is hook signal (off hook/off hook) output terminal, l" is transmitting audio signal output terminal, 1 is receiving audio signal input terminal, POW is power supply terminal It is. Mobile device TRX
HK I and I-I K 2 are both hook signal input terminals. The branch connection circuit 180 includes relays RL I, 21', 2. R, L3゜1'<[4
and RL 5, which are controlled by a microcomputer CPU 2.

Two video rams VRA and VRAM2 are connected to the microcomputer CPU3. CPU 3
outputs address data and inputs/outputs data via port 1-]) BO~1]B7. 71-res data is latched by the signal from port 1-ΔF, TE, and is stored in VRAM1. ■RAM2 Noatresbo 1-
D is applied. VRA old, VRAM2 is C1'''U3
When there is a write instruction signal WT or a read instruction signal RD from , writing or reading is performed to or from the memory at the specified address at that timing.

VRAMI and VRAM2c, CPU3 (7) boat P2
Either one is selected depending on the level of the signal from 1.

The video ram (VRA, M1., VR, AM2) generates a television scanning synchronization signal and, in synchronization with that signal, sequentially scans data from different addresses at a predetermined timing, as is generally well known. Reads memory data and outputs it as an image signal. Therefore, if you change the data in the built-in memory, the state of the output image signal will also change, and by writing specified data to a specified address in this memory, a television image signal for displaying specified numbers, characters, etc. is generated. be done. The image signal and synchronization signal generated in this way are applied to modulators 210 and 220,
The high frequency modulated signal is output to the transmission line 250 via the mixer 230 and the like. The output of VRAMI is directly applied to the modulator 2], while the output of VRAM2 is applied to the modulator 220 through the contacts of the relay 8.

The output of the VRAM 2 and the output of the rear confirmation television camera TVC are selectively applied to the signal input terminal of the modulator 220 depending on the states of the contacts of the relays RL and 8.

Connected to the input port P27 of the CPU 3 is a reed switch SS connected to the vehicle speed 1 (a permanent magnet connected to the meter cable and rotated according to the vehicle speed.CP
An analog-to-digital converter ADC is connected to boat 1]10 to P15 of U3, and the output terminal of amplifier ΔM3 connected to fuel bar 1 is connected to the input terminal of AI)C. . Relays RL 9 and RL 8 are connected to the output ports 1-P 1 G and 17 of the CPU 3, respectively.
A driver is connected.

Port l-P of microcomputer CPU2], 4
.

P], 5. Port hP22 of PI3 and CPU3. P23,
CI) U 2 and CI) U 3 transmit signals such as commands and data to each other via these ports 1-. The power supply for the microcomputer CPU3 and its peripheral circuits (display circuit system) is from the CP
Turned on/off by U2.

The general operation of the FSK modulation circuit +00 will be explained with reference to FIGS. 3a and 3b. The input terminal CLOO is connected to the output capacitor of the microcomputer CPUI -1-Δ[-1Y
A fixed periodic pulse signal (clock pulse) is applied from the signal. Counters 7 and 1 divide this clock pulse,
Outputs two types of signals with different periods. Input end SW is 1-
When the SK signal output permission level is (11), one of the two types of output signals of the counter Z1 is selected according to the level of the signal applied to the data input terminal DTN.
At the period of that signal, one output terminal OT-C", D Ol
-I A level changes binary.

By this (iT- issue), 1-run lister Q1 and Q
2 is controlled on/off, and when the capacitor is switched on/off, charging and discharging of the capacitor occurs, and positive and negative polarity signals are generated in the transmission path. In other words, the period of this signal changes according to the 4t3' signal set at the input terminal DTN of the modulator, so if predetermined serial data is set at DIN, the 7F S K will change according to that data. A signal is output to the transmission line.

When the port pH is at a low level, a low level r- and a high level H are applied to transistors Q1 and Q2, respectively. In this state, both 1-run listers Q1 and Q2 are turned off and do not output the SK signal.

If there is an FSK signal on the transmission path, Schmitt 1~
An FSK signal of a predetermined amplitude is outputted to the output terminal of the trigger ST1. FSK demodulator 110 demodulates this signal and
A binary signal corresponding to the cycle of the SK signal is applied to the input capo 1-T of the CPU.

FIG. 5 schematically shows signal waveforms at each part of the device shown in FIG. 1.

In this example, as shown in FIG. 5, a large number of signals are superimposed on one transmission path. In this example, we set the frequency of the FSK signal to 50 Kllz and ]0
OKllz, the center frequency of the FM signal (audio modulation signal) is 10,7 Mllz, and the modulators 210 and 2
The frequencies of the signals outputted by 20 are set to different television channel frequencies.

F S K (There is a simulator l-
1-1, 1GaS'1"] and S-2, which remove signal components other than the FSK signal and noise, so that the 1-1SK demodulator is equipped with a Only the extracted F'SK signal is applied.Furthermore, the FM demodulation circuit 170 is equipped with a ceramic filter.
A (bandpass filter) cFT is provided, which extracts the FM signal (sound modulation signal) component. Furthermore, the tuners 1 and 2 are each equipped with a tuning circuit that extracts a signal component of a predetermined frequency, and demodulates the signal component from the modulators 210 and 220, respectively, to output the signal to the monitor television'] V1 and ]Apply to V2.

FIG. 6 shows the FSK modulation circuit +00 and 150 of the embodiment.
The configuration of the send (n signal) applied by the microcomputers 8o and 130 is shown in FIG. 6. To explain with reference to FIG. , followed by 1-bit star 1
-bit, 8 bits 1- data o 9 and 8 bits BC
It has a C chord. 8 hino] - data is pitch h
0 to 1-4 indicate the type of key, beeps 1-5 indicate key on/off ("1" is on, "0" is off), and hits 6 and 7 indicate key groups. In this example, the group of keys is A, denoted by ro OJ.

13 indicated by "01" and 3 of C indicated by "10"
Divide into groups.

To explain with reference to FIG. 2b, key group A includes numeric keys (0 to 9), #, *, clear key CLR, and hold key HCILD, key group 13 is a horn key, and key group C is They are a rear confirmation key, a fuel key, a vehicle speed display key (speed), and a call/off key CAI, L/○FF.

FIG. 7 schematically shows the operation of the device when performing a calling operation on the on-board telephone from the steering operation board, and the operation of the device when performing a receiving operation. This will be explained with reference to FIG.

Outgoing call operation: Display the destination phone number on the steering wheel operation board.
Enter using the second numeric keys, * and #. Then, the microcomputer memorizes the key-entered phone number.

Wait for the call-off key CAL +-/OF to be pressed.

When the call-off key CA, LL10FF is operated, the other party of the stored telephone number is automatically called.

The called party hangs up the receiver (off-hook)
Then, you can make hands-free calls.

Note that if you operate the hold key 110 LD here,
Relays R+ and 5 are activated, and the microphones MICI and MC2 of the microphones MICI and MC2 on the microphones 2 of the steering wheel are cut off from the mobile device RX, and no sound is transmitted from the vehicle.

When the call-off key CAL Llo FF is operated again, it is determined that one call has ended, and the communication is terminated.

Receiving operation When the other party calls the on-board telephone, a ring tone sounds.

Wait until the call-off key CALL/'OFF is operated.

When the call-off key CALL10FF is operated, the state is the same as when the telephone receiver is lifted, the voice of the other party is output from the speaker SP, and the microphones MCI and MC2 on the steering operation board are used as transmitters to communicate with the on-board telephone. connected to.

When the call-off key CALL/OF is operated again, it is determined that the call has ended, and the communication is terminated.

8a and 8b show the operation of the steering operation board shown in FIG. 3a. The operation of each step of the steering boat will be described with reference to FIGS. 8a and 8b.

The contents of the Sl memory are set as initial values, and the states of each output capo-1- of the microcomputer 80 are set to initial levels. Through this processing, the output capo-l=P11 becomes low level L, and output of the FSK signal is prohibited.

S2 Key reading signal ratio capo-1-i.e. P2O.

The data to be output to I"21 and P22 is set to the initial value. This initial data sets the pin 1- corresponding to the output cap-1- connected to the row line of the key matrix from which reading is to be started to "0" (i.e. The value is set such that the low level (L) is set and the other bits are set to "1" (that is, high level H). In this example, the boat P20 is
The bits corresponding to ``0'', baud l-P 21 and P
The bit corresponding to 22 is designated as rlJ.

S3 Specified data is sent to baud hP20. P21 and P
Output to 2'2. As a result, boat P20~I)
Any one of the 22 boats to 1 becomes the low level L, and the other boats become the high level 11.

S4 Read the levels of the input ports DBO to DI37 connected to the column lines of the key matrix. Referring to Fig. 3a, the six capacitors 1-DBO-DB7 are pulled up to the power supply line VCC through a resistor, and the output capacitor 1-DBO-DB7 is pulled up to the power supply line VCC through a resistor.
- Since each key is connected in a matrix between P20 to P22 and input ports DBO to DB7, for example, when key 0 of key matrix 90 is pressed, a low level ■ is set to output port P20. At the timing of
The levels of input ports DBO to DB7 are respectively 1.
-T, t1°H, H, H, H and H.

S5: Invert 1/Q of each pin 1- of the data read in step S4. In other words, take the complement.

S6 The key reading data obtained in step S5 is set to 0.
Compare with. If the value is O, there is no key manpower and the process proceeds to step S13; otherwise.

Proceed to step S7.

S7: Save the key reading data in a predetermined memory.

S8: In order to eliminate the influence of mechanical vibration, that is, chattering, of the key contacts, wait a predetermined time (for example, 1 Om5ec) necessary for the vibration to subside.

S9 Read the levels of boats DBO to DB7 again.

S10: Compute the logical OR of each bit of the value read in step S9 and the value saved in the memory in step S7.

Sll Check whether the calculation result in step S10 is not 0. If it is not 0, it is assumed that there is no key personnel and the process proceeds to step S13; otherwise, the process proceeds to step S12.
Proceed to.

S12 Decapo-1-P20. Pitch of data “0” of key reading line signal data output to P21 and P22;-
And from the data read from boat DBO~DI37,
Generates an 8-bit key code corresponding to the pressed key.

Si2 The bit of the data rOJ of the key reading row signal data output to the output ports P20 to P22 is set to 1 pin I-
Shift 1 to the next bin i-.

S14 Check whether one key reading scan is completed. If not completed, the process returns to step S3.

S15 Because there was no key manpower, 8 Pinotoko-F
The key code is OOI+ (in hexadecimal).

S16 Load the key code from the previous key reading scan from the memory.

817 Calculates the logical sum of the old key code loaded in step 816 and the new key code obtained by the current key reading scan for each pill.

S18 Check whether the calculation result is 0. If 0, that is, there is no key operation, the process returns to step S2; otherwise, the process proceeds to step SI9.

SL'9 Slide the newly generated key code into the memory at a predetermined address.

S20 Check whether the key code belongs to key group A.

Check whether the S2+ key was pressed or released. Group A keys, ie numeric keys.

Since the * key, # key, clear key CLR, and hold key HOLD are valid only when they are pressed, the process jumps to step S2 when the keys are released.

S22 The buzzer sounds once to confirm the key force.

S23 Check whether the pressed key belongs to group B. The keys of group B, ie, the horn keys, are valid both when pressed and when released.

S24 Sends the generated key code data to the transmission line, and notifies the device on the vehicle body side that the key has been manually operated. This process will be explained in detail later.

525 In the data transmission of step 824, check whether the data was sent correctly.

S26 Check whether the pressed key belongs to group C. For the keys of group C, ie, the rear confirmation key, fuel key, vehicle speed display key, and call-off key CALL/OF, data inverted between key on/off is transmitted each time the key is pressed.

S27 Load data indicating the on/off status of the group C key from the memory.

328 From the key code and the data loaded in step S27, a new key code with the on/off state of the group C key reversed is generated. For example, if the call-off key was turned on in the previous key operation, key code data indicating that the call-off key is turned off is generated in the current key operation.

S29 Similar to step S24, S30 checks whether the data was sent correctly in the data transmission of step S29.

S31: Invert the contents of the memory that stores the on/off status of group C keys.

832 Depending on the state of the group C key, on/off control of the relays RL l , RL 2 , buzzer BZ, etc. connected to the output port P 15 of the microcomputer 80 is performed. This controls the FM modulation circuit 95 and the display circuit (TVI, 'rV2.TUI, TU2).

833 An error occurred in data transmission, so the buzzer B
Sound Z twice to notify the driver of the error occurrence.

834 A key reading error occurred, so the buzzer BZ
sounds three times to notify the driver that an error has occurred.

9a, 9b and 9c show the microcomputer C1)IJ2(1) shown in FIGS. 4a and 4b.
:30) operation is shown. Each operation step will be explained with reference to FIGS. 9a, 91] and 9c.

S51 The contents of the memory are set as initial values, and the status of each output capo-1- of the microcomputer CI) U2 is set to the initial level. Through this process, the output port PLI becomes low level L, and output of the FSK signal is prohibited.

S52 Check whether the telephone TEL is off the hook.

S53 Since the telephone TEL is off the hook, output 11 to output capo-l-1-IK 20, turn on relay RL, 4, and output t(to) to output capo-l-HK 10. , output L to output capo-1-Audio to turn off relays RL2, R1, and 3.Now, the telephone set can be used in the same manner as a normal Tojo telephone.

S54: Load the contents of the memory that stores the hands-free call instruction from the steering wheel operation board.

85.5 Check whether hands-free calling is specified. In the initial state, hands-free calling is not specified, so the process advances to step S57, but when the call-off key CALL10FF on the steering wheel operation board is turned on (C
ALL), a hands-free call is designated and the process advances to step S56.

S56 Output H to output port HK20 and relay R
Turn on L4, set H to output port HK10, output H to output port Audio to turn on relays RL2 and RL3, and output L to output port PS to set relay RLI to ON. Now, the telephone equipment and the mobile device TRX are powered on, the FM demodulation circuit 170 is powered on, and the amplifier AM is connected to the audio receiving line of the mobile device TRX.
P is connected.

S57 Output L to output port HOLD and relay R
Turn off L5, output L to output port 1-HK 20, turn off relay RL4, set output port HKIO to L, output L to output port Audio, and switch relay R,
Turn off L2 and RL3 and connect the output capo-l-P
(is output and relay RLI is set to OFF.) This turns off the power of the telephone equipment, mobile equipment TRX, and FM demodulation circuit 170, and the telephone equipment El is connected to the mobile equipment TRX.

858 Receive data from steering operation board. This will be explained in detail later.

S59 It is determined whether data transmission generated by key operation on the steering operation board was sent from the steering operation board.

S60 It is determined whether the sent data is a group A key code.

S61 It is determined whether the key code is a numeric key, * key, or # key.

S62 It is determined whether the key code is the hold key HOLD.

56-3 Determine whether the key code is the clear key ○LR.

864 Clears the memory address counter that stores the key codes of the numeric keys sent so far. In other words, the previous numeric key input is canceled.

S65 Determine whether the key code belongs to group B.

866 Determine whether the key code corresponds to a horn key.

S67 Is the key code on? Is the key switch on? 368
Now that the horn key has been released, set the horn to off.

S69 Since the horn key was pressed, set the horn to on.

S70 Check whether the key code belongs to group C.

S71 Since the key code received as data is not one of groups A, B, or C, it is treated as a data reception error and the buzzer BZ sounds three times.

872 Loads the contents of the memory that stores hands-free call instructions from the steering operation board.

S73 Check whether the data loaded in S72 specifies hands-free calling.

874 Loads the contents of the memory that stores the instructions given by the hold key HOL D.

875 Data loaded on S74 '1 (7) I10C
on/off) and store it in the original memory. Therefore, if there is no previous hold instruction, a predetermined bit of the data is set to rlJ, that is, a hold instruction.

57 (i) Check whether the halt designation is correct.

577 Since hold release is specified, output L to output port HOLD and turn off relay RL5.
do. The signal output terminal of the FM demodulation circuit 170 is now connected to the transmitting audio terminal T of the mobile device TRX, and it becomes possible to talk using the microbons MC1' and MC2 on the steering wheel.

878 Hold is specified, so output port HO
Output H to LD and turn on relay RL5)
do. Now the output terminal of the FM demodulation circuit 170 and the mobile device TR
X is separated.

S79 The key code for the numeric key has arrived.

Enter that code into the BCD (Bi
(nary Coded Decimal) code and stores it in memory at a predetermined address.

S80: Increment the contents of the counter that specifies the address of the memory that stores the BCD code of the numerical key.

S81 It is checked whether the key code received from the steering operation board indicates operation of the call-off key CAL L 10FF. If it is not the call/off key, step S201 is executed.

S82 Key code is call-off key on (CAL
L) Determine what indicates the state.

S83 Since the call-off key has been set to OFF, the contents of the memory that stores the hands-free call designation are set to "0".
” (hands-free call cancellation).

S84 Since the call-off key has been set to CALL, the contents of the memory storing the hands-free call designation are set to "1" (hands-free call designation).

885 Check whether the handset of the telephone set is off the TEL.

S86 Outputs H to output port HK20, turns on relays R and L4, and outputs H to output port HKIO.
- Output l( to the output port Audio and relay R
Turn on 1, 2, RL, and 3, and connect L to output port PS.
Outputs and sets relay RLI on. with this,
The power of the telephone TEL and mobile device TRX is turned on,
The power of the FM demodulation circuit 170 is turned on, and the amplifier AMP is connected to the audio reception line of the mobile device TRX.

S87: Wait for the relay operating time and the time required for the mobile device to enter a predetermined operating state from power-on.

888 Check whether the mobile device TRX is powered on.

889 Check whether the vehicle is in a position where it can communicate (whether radio waves can be received). this is.

The determination is made by checking whether the output terminal CI of the TRX is at a level indicating the speech surface.

S90 Since the vehicle is in a position where a failure has occurred or communication is not possible, the buzzer BZ sounds twice to notify the driver that an error has occurred.

S91: Set the contents of the memory that stores the hand-free call designation to "0" (hand-free call cancellation).

S92 4-bit BCD of numerical value input with numerical keys
The contents of the memory storing the code are read from the address specified by the numerical pointer (address counter) and loaded into a predetermined register.

S93 Convert the BCD code obtained in step S92 to the same code as the dial code generated by the telephone device.

S94 The dial code obtained in S93 is sequentially output to the DI terminal in synchronization with the pulse signal output from the CP terminal of the mobile station TRX.

S95 Increment the value of the numerical pointer once.

Check whether all 396 BCD codes have been read from memory. This is determined by looking at the value of the numerical pointer. If the process is not completed, the process returns to step S92 and the BCD code is read from the next numerical pointer.

5201 Check whether a key related to the TV display, ie, a rear confirmation key, a fuel key, or a vehicle speed display key, has been pressed.

5202 Determines whether the current key operation is to set the display on or off.

5203 Executed when setting a predetermined display to off. In addition to the display to be set off this time, it is determined whether any of the rear confirmation display, fuel display, and vehicle speed display is set to on (display).

5204 Since the rear confirmation display, fuel display, and vehicle speed display are all set to OFF, relay RL7 is set to OFF to cut off the power supplied to the microcomputer CPU3 and its surrounding display circuits.

5205 Among the display state memories assigned to the rear confirmation display, fuel display, and vehicle speed display, those that were set to be hidden this time are set to "o" (non-display).

8206 Since display has been instructed, relay RL7 is turned on to supply power to CPU3 and the display circuit around it.

8207 Waits for a predetermined time required until the microcomputer CPU3 becomes ready to receive data, that is, from turning on the power to completing initial settings.

5208 Boat PJ4. Using P15 and PI3, write the instruction code corresponding to the display that has the on setting to C,
Transmit to PU3.

5209 The code sent by CPU2 at 8208 is sent to the CPU
Check whether 3 has been received normally.

Specifically, when the code is transmitted, the CPU 3 outputs a reception completion code (acknowledge signal) after a predetermined time, so the CPU 2 checks the predetermined input port and sends the
It is monitored whether a predetermined code from PU3 is received within a predetermined time.

5210 Among the display state memories assigned to the rear confirmation display, fuel display, and vehicle speed display, the contents of the one set for display this time are set to II II II (displaying).

8211 Since a predetermined acknowledge signal does not arrive within a predetermined time for the command code sent from the CPU 2, it is assumed that a transmission error has occurred and the buzzer sounds twice.

FIG. 10a shows details of the data transmission (transmission) operation of the microcomputer 80. The operation of each step will be explained with reference to FIG. 10a.

5101 Generates an 8-bit CRC check character BCC for the data to be transmitted.

5102 Limit the number of data transmissions or set a predetermined value in the limit counter.

5103 Set to output port P11t&H to FS'
The mark, start bit, transmission data, and BCC code bit data are sequentially set to the output port P10 in synchronization with the clock.

5104 Set the output port pH to L to prohibit output of the FSK signal.

5105 Check whether there is data input from the other party's FSK modulation circuit. Without data entry,
Proceed to step 8107.

5106 Check whether the data sent from the other party is an acknowledge ACKO indicating data reception confirmation. As will be explained later, when data is transmitted, the receiving side outputs an ACKO to the transmitting side.

5107 Decrement the value of the limit counter,
It is determined whether the result is 0 or not. 510 if not 0
Return to 3, and if it is 0, proceed to 8113.

8108 Set H to the output port pH again and press F.
Enable to output SK signal and mark.

The start bit and each bit of acknowledge ACKI indicating confirmation of ACKO are output continuously in synchronization with the clock.

5109 Set the output port pH to L to prohibit output of the FSK signal.

5110 Check whether an FSK signal has arrived from the other party (receiving side). As will be explained later, if the receiving side receives an acknowledgment ACKI from the transmitting side after outputting the acknowledge ACKO, it will stop outputting the FSK signal, but if it does not receive ACK 1, it will output the FSK signal including the ACKO again. Output. Therefore, the fact that the FSK signal comes from the receiving side means that the data ACK1 from the transmitting side has not been received by the receiving side.

Sl'll ACKI is not received by the receiving side, so the value of the limit counter is decremented once,
Check whether the value is 0. If it is not 0, the process returns to step 8106 and transmits ACK1 again; if it is 0, the process proceeds to step 5113.

5112 Data transmission was completed within the specified number of times set in the limit counter, so the transmission result code is set to II.
Set Q K II.

5113 Even after data transmission is performed the predetermined number of times set in the limit counter, data and acknowledgement ACKI are not transmitted normally, so the transmission result code is “”.
Set "NG".

FIG. 3 shows details of the data receiving operation of the microcomputer 130. The operation of each step will be explained with reference to FIG. 10b.

8121 Check whether the FSK signal has been received, ie, whether data has been input to the input boat TO.

8122 Since no data is coming to the human powered boat TO, a code corresponding to no data reception is set in the data reception memory.

8123 Limit the number of data reception operations for one data transmission or set a predetermined value in the limit counter.

5124 Generate CRC check character BCC from received data.

5125 Compare the BCC value of the received data and the BCC value generated in step 5124. If the two are equal, it is determined that the data has been received correctly and the process proceeds to step 5128; otherwise, the process proceeds to 8126.

8126 An error occurred, so set the limit counter to 1.
Decrement it times and check if the result is 0. If not 0, return to 5127; if 0, return to 5134
Proceed to.

5127 There is data input, but please check it.

If there is received data, proceed to 8124; if not, proceed to 5126
Proceed to.

5128 Data was received normally, so output port p
Set H to 11 to enable FSK signal output, mark, start bit, and acknowledge ACKO.
Continuously outputs each bit in synchronization with the clock.

5I29 Set L to output port pH, FSK
Prohibit signal output.

5130 Check whether the FSK signal has been received on the receiving side.

8131 Check whether the received data corresponds to the acknowledgment ACKI from the transmitting side, which is issued in response to the acknowledgment ACKO from the receiving side. If the ACK is 1, proceed to 5133; otherwise proceed to 5132.

5132 Decrement the contents of the limit counter once and check whether the result is 0. If it is not 0, the process returns to 5128, and if it is 0, the process proceeds to 5134.

5133 Data transmission was completed within the specified number of times set in the limit counter, so the transmission result code is 'OK'.
”.

5134 Even after data transmission is performed the predetermined number of times set in the limit counter, data and acknowledge ACK1 are not transmitted normally, so HN is added to the transmission result code.
Set Q II.

FIG. 11 shows a schematic operation of the microcomputer CPU3. This will be explained with reference to FIG.

8301 Initialize (clear) the output port level and memory contents.

5302 Boat P22. The levels of P23 and P24 are monitored to check whether data is being sent from the CPU2.

5303 Checks the data sent from the CPU 2 and determines whether it is an instruction to display backward confirmation. If YES, the process advances to 8306, and if the setting is on, the rear check code is set to 11'' in 5307, and if the setting is off, the code is set to II OIT in 5308.

5304 Checks the data sent from the CPU 2 and determines whether it is an instruction to display the vehicle speed. If YES, proceed to 5309, and if set to on, set the vehicle speed display code to IT I H at 5310; if set to off, set the vehicle speed display code to 531
1 sets the code to rr On.

5305 Check the data sent from CPU2,
Determine whether the fuel display is an instruction. If YES then 5
Proceed to 312 and set the fuel display code to rr 1 n in 5313 if the setting is on, or 5 if the setting is off.
At 314, the code is set to II OII.

5315 Check the backward confirmation display code.

If this code is II I II, go to 8316.

Set relays R, L8 and RL9 to ON. That is, the power of the television camera TVC is turned on, and the modulator 220
Connect the input of the TVC to the output terminal of the TVC. The image behind the vehicle captured by the television camera TVC is now output in the form of a television image signal, and a high-frequency signal modulated by this signal is
It passes through the transmission line 250 and reaches the steering operation board. This signal is demodulated into the original television signal by the tuner TU2 on the operation board, and is applied to the monitor television TV2.

5315 and the backward confirmation code is Tr OII, 5
Proceeding to 317, relays RL8 and RL9 are set to OFF. This turns off the power to the TVC, and the outputs of the video RAM V and RAM2 are connected to the input terminal of the modulator 220.

8318 Check the vehicle speed display code. When this code is n 1 n, a vehicle speed display operation is performed.

That is, the process first proceeds to 5319, and the input boat P2 is input for a predetermined period of time.
The level of 7 is monitored and the number of pulse signals applied during that time is counted. Next, at 8320, the vehicle speed is calculated from the count value, and at 5321, predetermined data for displaying the vehicle speed is written in the memory of the VRAM2. V l? Since AM2 generates a television signal according to the memory contents, a signal containing vehicle speed display information (numerical value) is applied to the modulator 220 and converted into a high frequency modulation signal, and this signal is transmitted to the transmission line 2.
Tuner TU on steering operation board via 50
2 and demodulated, and the vehicle speed is displayed on the monitor TV TV2. The vehicle speed display code is changed to rp by 831B processing.
If it is r, the process advances to 5322 to clear the memory contents of VRAM2. This clears the display on TV2.

5323 Check fuel display code. If this code is IT I II, a fuel display operation is performed.

That is, first, proceed to 5324, instruct the analog-to-digital converter ADC to convert (signal output to PI3), and when the conversion is completed (check PI3), convert the converted data to PIO.
~Read from P13. The conversion data is converted to numerical data, and according to the result, the video ram VRAM1 is stored in the 5325.
Write data to a predetermined memory. VRAMI is VR
Similar to AM2, the contents of the small memo τ are sequentially read out, a television image signal corresponding to the contents is generated, and this is sent to the modulator 2.
Apply 10K.

The high frequency modulated signal output from the modulator 210 (passes through the mixer @230 and is output to the transmission line 250K).

This signal is from the tuner TUI on the steering control board.
The signal is received and demodulated by the receiver and applied to the monitor television rV1. 5323 and the fuel display code is ``0'', VR
Clear the AMI memory and turn off the TVI display.

In the above embodiment, a cathode ray tube display was used as the display, but instead of this, a liquid crystal display, plasma display, EL display, etc. may also be mounted on the steering operation board if they are relatively thin. I can do it.

As described above, according to the present invention, a variety of information can be displayed because a one-sided display is used, and since the one-sided display is placed on the steering operation board, the display is easy to see even if the display is small. In addition, each type of signal is converted to a different frequency, superimposed, and output on the transmission line, so the connection between the steering control board and the vehicle body requires at least one transmission line for power transmission and one for signal transmission. The configuration of the transmission path is simple.

[Brief explanation of drawings]

FIG. 1 is a schematic system block diagram of one embodiment of the present invention. FIG. 2a is a perspective view showing the vicinity of the steering wheel and driver seat of an automobile equipped with the device shown in FIG. 1;
FIG. 2b is a perspective view showing the steering wheel shown in FIG. 2a, FIG. 2c is a side view showing the mounting structure of the steering wheel portion shown in FIG. 2a, and FIGS. 2d and 2e are brush BΔ1. An enlarged sectional view and an exploded perspective view showing the structure of the attachment of the slip ring SA1 and the like. FIG. 3a is a block diagram showing an electric circuit provided on the operation board on the steering wheel of the device of FIG. 1;
FIG. 3b is a block diagram showing the configuration of the FSK modulation/demodulation circuit. 4a and 4b are block diagrams showing electric circuits provided on the vehicle main body side of the device shown in FIG. 1. FIG. FIG. 5 is a waveform diagram showing schematic signal waveforms of each part of the device shown in FIG. FIG. 6 is a plan view showing the structure of a data string of a signal (FSK) transmitted by the device shown in FIG. FIG. 7 is a flowchart outlining the calling and receiving operations when making a telephone call using the apparatus shown in FIG. 8a and 8b are flowcharts showing the operation of the microcomputer CPUI in FIG. 1, and FIGS. 9a, 9b, and 9C are flowcharts 1-1 showing the operation of the microcomputer CPU2 in FIG. 10a is a flowchart showing the data transmission (sending) operation of the microcomputer C and PU1 in FIG. 1, FIG. 10a is a flowchart showing the data reception operation of the microcomputer CPU2, and FIG.
This is a flowchart 1- showing the operation. 1: Driver seat location: Phone 3 Steering wheel 4 Steering operation board 5: Operation panel 38, 4], : Support 39
．． 42: Gear 40: Steering shaft 43: Connection member 44 Niblint board 51: Insulator plate 52. 53: Shield plate 54: Resin collar 70. 120: Constant voltage power supply 80: Microcomputer 90: Key switch (switch means) 95 :FM modulation circuit 100:FSK modulation circuit (first modulation means) 110':
FSK demodulation circuit 130: Microcomputer 150: FSK modulation circuit +60: FSK demodulation circuit (second demodulation means) 170: F
M demodulation circuit 180 nib branch connection circuit 210.220: modulator (second modulation means) TVI, T
V2: Blur run tube display (surface display means) "I'Ul,
1”U2: tuner (first demodulation means) VRAMI,
VRAM2: Video RAM (display signal generation means) '1'■
C: Television camera (display signal generation means) MCI, MC2
:Microphone SAI, SA2. SBI, SB2 Nislip Ring BA
I, BA2. BBI, BB2: Brush TRX: Mobile device
DFA: Differential amplifier SP: Speaker Patent applicant Aisin Seiki Co., Ltd. and 1 other person Condolences 2a Drawing fan 2bffi Procedural amendment (method) Commissioner of the Japan Patent Office Kazuinu Wakasugi 1, Indication of case Patent application No. 34264 of 1982 2 ,
Title of the invention On-vehicle display device 3, relationship to the amended case Patent applicant address 2-1 Asahi-cho, Kariya-shi, Aichi Prefecture Name (001) Aisin Seiki Co., Ltd. Makoto T42 Representative Reio Chugai 4, Agent Address: 103 Telephone number: 03-864-6052
Location: Showa Building, 2-27-6 Higashi Nihonbashi, Chuo-ku, Tokyo
4th floor 5, date of amendment order 7, engraving of content drawings of amendments (all times) (no change in content) 8, catalog drawing of attached documents... 1 copy 168

Claims (6)

[Claims] (1) Equipped on or near the steering wheel. A steering operation board comprising: a first demodulating means for giving a signal to at least one surface display means, a switch means, and a first modulating means for modulating a signal according to the operation of the switch means; a vehicle; A display signal generating means installed in the main body and outputting two-dimensional information.Second modulating means modulating the two-dimensional information from the display signal generating means and outputting a signal having a frequency different from that of the signal emitted by the first modulating means. , a second demodulating means for demodulating the signal modulated by the first modulating means, and an electronic control device for controlling the display signal generating means in accordance with the signal from the second demodulating means; and a brush. and a slip ring, the power line of the on-vehicle control device and the power line of the steering operation board are connected via the first set of electrical connection means, and the second set of electrical connection means The first modulation means and the first demodulation means, the second modulation means and the second
An on-vehicle display device comprising: a transmission means electrically connected to a demodulation means; (2) The electrical connection means of the transmission means includes first and second brushes mounted on the steering wheel facing in opposite directions, and a first slip ring facing the first brush and fixed to the steering operation board. . The on-vehicle display device according to claim 1, further comprising a second slip ring that is fixed to the vehicle body and faces the second brush. (3) The scope of the above-mentioned claims, wherein the slip rings of the first set of electrical connection means and the slip rings of the second set of electrical connection means have different diameters, and are arranged concentrically around the steering operation shaft. The on-vehicle display device according to item (1). (4) The first modulation means includes a digital modulator and an analog modulator, and the second demodulation means includes a digital demodulator and an analog demodulator, and the electrical signal from the acoustic-electrical converter is input to the analog modulator. The on-vehicle display device according to claim (1), wherein the on-vehicle display device is configured to apply voltage. (5) The on-vehicle display device according to claim (1), wherein the slip ring is covered with an annular ground conductor. (6) The display signal generation means has a plurality of signal sources and changeover switch means, and the electronic control device of the on-board control device has a second
Claims (1), (2) and (2), wherein the switch means is switched in response to a signal from a demodulation means.
3), (4) or (5) ``2 display device.