JPS59158629A - Display device mounted on car - Google Patents

Abstract

PURPOSE:To attain easy-to-see display of various information even with a small display area by arranging a key switch and a screen display device on a steering operating board, and a TV camera and a character display device or the like to a device main body side. CONSTITUTION:The small-sized screen TV1, TV2, tuners TU1, 2, a distributor 190, the key switch 90, a CPU80 controlling the switch 90, FSK modulation and demodulation device 100, 110 to the signal of the CPU80, microphones MC1, MC2 and their modulator 95 are provided. The TV camera, a modulator 220 for the signal from the TV camera, a CPU200 receiving signals from various sensors and controlling various display devices, a CPU130 and FSK modulating and demodulating devices 150, 160 for the signal from the CPU130, a telephone set TEL, a mobile radio device TRX, a speaker SP and a demodulator 170 or the like for the speaker are arranged to the car main body. The signal from each modulating and demodulating device is fed to a transmission line 250 via a capacitor, and the transmission line connects the board and the car body side via a connecting mechanism comprising slip rings SA1, SA2 and brushs BA1, BA2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an on-vehicle display device that displays various numerical information, one image information, etc., and particularly relates to an on-vehicle display device that displays various numerical information, one image information, etc., and particularly relates to a vehicle display device in which a surface display device is placed on or near the steering wheel so that it can be easily seen by the driver. Regarding equipment.

In a vehicle, the steering wheel is the closest to the driver, and it is also closest to the driver's hands, so in order to improve operability, it is necessary to install a control board 1-2 display equipped with key switches for controlling on-board equipment. is preferably installed in the center of the steering wheel.

Furthermore, in order to display a large amount of information or image information, it is preferable to use a surface display such as a cathode ray tube display (CRT) as a display, but since many devices are generally already installed near the driver's seat, It is difficult to secure a large space for display there.

Therefore, this type of display has no choice but to be small, but if the display is made small, the display becomes difficult to read, so it is better to place the display on the steering wheel near the driver. However, the space above the steering wheel is limited, so there is a key switch,
Only the minimum necessary equipment such as a screen display can be installed.

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 the steering mechanism that transmits the rotation of the wheel to the steering shirt 1- is complicated. However, 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 steering wheel and the fixed control unit 1-. A connection mechanism that combines slip rings and brushes can be used to wire the steering wheel so that it does not interfere with its rotation, but a large number of slip rings and brushes are required to transmit various types of information, and the configuration is difficult. This type of wiring is quite difficult in steering mechanisms where the connection mechanism is complex and requires a large amount of space, 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 displayed 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 device main body and the steering operation board.

In order to achieve the second object, in the present invention, a key switch and a surface display are arranged on the steering operation board, and a TV camera, a character display device, etc. that output display information are arranged on the device main body side, and the steering 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 displayed information are set to different frequencies, and these signals are placed on the same transmission path. A power line is connected to this one transmission line via an electric coil having a relatively high impedance for alternating current signals, and the single transmission line is used to supply power and transmit various signals.

When a surface display is placed above the steering wheel, if the surface display rotates as the steering wheel turns, the display will be difficult to see. Therefore, in one preferred embodiment of the present invention, the steering control boards 1~ are made to float above the steering wheel, and at least two sets of electrical connection mechanisms each consisting of a slip ring and a brush are provided, one of which connects the steering wheel and the vehicle body. 9 According to this, the other side is used to connect the steering wheel and steering operation board.
The display surface does not tilt even when the steering wheel is tilted, so if, for example, the driver wants to display an image from a TV camera pointing toward the rear of the vehicle to confirm the rear view, the driver can turn the steering wheel while keeping the display in mind when driving into the garage. etc.

When installing a telephone, radio, etc. on the 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.Also, in order to block out surrounding sounds, the microphone should be placed close to the driver. It is best to place it on the steering wheel. Therefore, part 1 of the present invention
In one preferred embodiment, a microphone and an analog modulator connected to its output are provided on the steering operation board, an analog demodulator is provided on the main body 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. A microcomputer unit 80 (CPU) controls the steering operation board.
]), key switch 90° FSK modulation/demodulation circuit 100,
110. Microphone MC'l, MC2, differential amplifier D
FA, FM modulator 95. Two screen displays or monitor televisions TV1, TV2. Tuner TU1. ．． TU2.
A distributor 190 and the like are provided.

The microphones MCI and MC2 are arranged facing the same direction (toward the driver's mouth) at a predetermined interval, and their output terminals are connected to different input terminals of the differential amplifier DFA. This allows the microphone MCI
The difference between the sound applied to MC2 and the sound applied to MC2 is DF
Since it is amplified by A, a large output can be obtained for the sound coming from the direction in which the MCI and MC2 are arranged, that is, the direction of the driver. In other words, the noise from the side is canceled out, and only the signal corresponding to the driver's voice is greatly amplified, and the FM modulator 9
5.

In this embodiment, the control unit on the vehicle body side includes a constant voltage power supply device 120. Microcomputer unit l-13
0 (CPU2), FSK modulation/demodulation circuit 15o, 16o, F
M demodulation circuit 170. Telephone station.

Radio communication device TRX for mobile device or telephone, branch connection circuit 180. Amplifier AMP, speaker SP, display microcomputer unit 200 (CPU3),
Video RAM VRAMI, VRAM2. modulator 210,
220. It is equipped with a television camera TVC, mixer 230, etc.

The transmission line 250 includes a slip ring SAI and a brush BA.
Connection mechanism consisting of I, slip ring SA2 and brush B
The steering operation board and the vehicle body are connected via the connection mechanism A2.

On the steering operation board, the FSK modulation/demodulation circuit 10
0,110. FM modulation circuit 95 and distributor 190 are each connected to the transmission line via a capacitor, and stabilized power supply circuit 70 is connected via electric coil L1. On the vehicle body side, FSK modulation/demodulation circuits 150, 160
．． FM demodulation circuit 170 and mixer 230 are each connected to transmission line 250 via a capacitor, and one end of stabilized power supply 120 and a power switch SW that operates in conjunction with the ignition key switch is connected via electric coil L2.

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.

There is a telephone set on the left side of the driver's seat 1-1.
1) Speaker SP is placed on the u side. The steering wheel 3 is located in the center of the steering wheel 3.
A steering operation board 4 is provided floating from the vehicle. The front panel 5 of the steering operation board 4 has display screens for two monitor TVs TVI and TV2, a rear confirmation key, a fuel key, and a speed key.

Call/on key, telephone numeric keypad, hold key,
Clear keys 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 installation structure of the steering wheel 3, the steering operation board, and the vehicle body. This will be explained with reference to FIG. 2c. Support 38 is support 4
1, and rotatably supports the gear 39. The gear 39 is fixed to the vehicle body. support 41
is fixed to a steering shaft 40, and the steering wheel 3 is connected to a support 41. Support 1-41
(The gears 39 and 42 are rotatably supported.

43 is a connecting member having gears 43a and 43b having the same number of teeth at both ends, and support 1-41t: rotatably supported. Gears 43a and 43) mesh with gears 39 and 42, respectively.

The printed circuit board 44 of the steering operation board and the operation panel 5 are fixed to the gear 42. Gears 39 and 42
The number of teeth is equal. With this configuration, the operation panel 5 is rotated as the steering wheel 3 is rotated.
In this embodiment, when the steering wheel 3 is rotated, the supports 1 to 41 and the steering shirt 1 to 40 are rotated, and the steering operation is performed. Since the gears 43a and 4313 and 39 and 42 have the same number of teeth, the support 41 times! l! lI し; depending) lI! The relative movement ff1 (angle) between the support 1-41 and the gear 39 caused by the arc-shaped movement of the mackerel member 43, and the relative movement between the support 1-41 and the gear 42 are essentially equal, and the gear 39 is fixed and the gear 4
2 does not rotate relative to gear 39; as a result, even if the steering wheel 3 turns, the operation panel 5 does not rotate).

The steering wheel 3 is equipped with two brushes BAI and )3A2 that are electrically connected to each other.

The brush BA1 has one end in contact with a slip ring SAI provided on the steering operation board side, and the brush BA2
The slip link provided at one end on the fixed side of the vehicle is in contact with JS (2). Figure 2d JE and Figure 2e show details of the configuration near the slip link SAI. The explanation will also be made with reference to FIGS. 2d and 2e. In this example, slip ring SΔ1.
Electromagnetic shielding is provided to prevent the S/N ratio from decreasing due to electromagnetic waves emitted from SA2 and the like. That is, the slip ring S A 1 is attached to the four parts of the resin insulator plate h51, which has four parts of a predetermined width formed into a linter shape, and the conductor shield plates j-52 and 53 are wrapped around the plate 1-51. It is installed. The shield plate 53 has grooves 51 . of the insulator plate 51 . a, 51
It is fixed at b. The brush BAL has a resin collar 54 attached to its tip, and a hole 53a of the shield plate 53.
is passed through the shell and is constantly in contact with the slip ring SA+ by the pressing force of the compression coil spring SPI.

The shield plates 1 to 52 are electrically connected to the gear 42,
The shield plate 53 is electrically connected to the steering wheel 3 and is grounded to the vehicle body. The vicinity of the slip ring SA2 and the brush BA2 has a similar structure, and two shield plates (not shown) in this part are grounded to the steering wheel 3 and the steering shirt 1.40, respectively.

FIG. 3a shows the configuration of the electric circuit on the steering control board 1. This will be explained with reference to FIG. 3a.

The key switch 90 connects three output ports P20 . It consists of a large number of key switches connected to P2+ and P22 and eight input ports DBO to DB7 in a 71-x configuration. These key switch contacts are opened and closed by operating a predetermined portion on the operation panel 5.

In this example, the FSK modulators 100 and 110 are 1-chip accumulation circuits, but the internal details are as follows.
The configuration is as shown in the figure. 100 is F'S
K modulator 110 is an FSK demodulator.

Note that the FSK modem 1.00. ]Z shown inside iQ
1, Z2 and Z3 are M manufactured by Molola Co., Ltd.
(shi)/1040.MCI4018 and MCI404
This is a counter that has a function equivalent to 0.

Other elements are general D type flip-flops,
Flip-flops on J-, Nandogoo 1~. Inverters, etc.

The terminal cr-o-c is the input terminal for the clock pulse that determines the reference timing of transmission, the terminal DIN is the input terminal for the binary data to be transmitted, the terminal SW is the input terminal for the signal that controls the output of the FSK signal, and the terminals DoLC and DOH. 8 is a modulation signal output terminal, terminal STN is an FSK signal input terminal, and 5OUT is a demodulated binary data output terminal.

Terminal C0LC of FSK modem 100.110.

DIN, SW and 5OUT are respectively connected to port 1 of CPU1. Pro, ALE and TO, and complementary outputs 1-run listers Ql, Q2 are connected to the modulation output terminals DOLC, 1) OHA. Output lines from transistors Ql and Q2 are connected to a transmission line to slip ring SAI via resistors and capacitors. Ii' of the modem 100, 110
S K signal input terminal SIN is Schmitt trigger STI
It is connected to. The input end of the STI is connected to the transmission line leading to the slip ring S A ]1 through a capacitor and a resistor.

A buzzer BZ is connected to the output port P14 of the microcomputer CPU1 via an inverter, and relays RLI and RL2 are connected to the output ports P15 and 1]16, respectively, via inverters.

The two output ends of the distributor 190 are connected to the tuners U1 and TU2, which are connected to the monitor televisions TVI and GO2, respectively. Tuner rU1 and TU2
are tuned to the frequency of the high frequency signal output from modulators 2], Q and 220, respectively. The input terminal of the stabilized power supply circuit that supplies power to tuners TUI and TU2 and monitor televisions TVI and TV2 is connected to relay RL.
It is connected to the power supply line through two contacts.

The contacts of relays R, L+ are connected to the input terminal of a stabilized power supply that supplies power to the audio signal circuit and to a 12V power supply line.

Microphones MCI and MC2 are connected to a differential amplifier DFA composed of an operational amplifier. Differential amplifier D
A bypass filter HPF constructed using an operational amplifier is connected to the output terminal of I''A.A low-pass filter L constructed using an operational amplifier is connected to the output terminal of the HPF.
Connect PF. The output signal of the low-pass filter LPF is amplified by the amplifier AMP and applied to the input terminal Audio in of the FM modulator FMM via the capacitor. A predetermined DC bias voltage is applied to the input terminals Audj, oj, n of the FMM through a variable resistor VRI.

The variable resistor VR1 sets the center frequency of the FM modulated wave. The FM modulator FMM is constructed as a one-chip pre-integration circuit, and the FM modulation circuit 1895 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 circuitry of the device on the vehicle body. This will be explained with reference to FIGS. 4a and 4b. The microcomputer CPU2 includes a modulator/demodulator 1.00.00 shown in FIG. 3b. ], FSK modulators 150 and 160 having the same configuration as 10 are connected. FSK modulator 150
The output terminal of the FSK demodulator 160 and the input terminal of the FSK demodulator 160 are connected to a slip ring SA2 through an output circuit such as a single trigger and an input circuit such as a Schmidts trigger.

The input end of the FM demodulation circuit 170 is connected to the slip ring SA2. The FM demodulation circuit 170 is composed of a ceramic filter CFT, a product circuit FMD for demodulating FM signals, a low frequency amplifier AM1, and the like. Power for the FM demodulation circuit 170 is supplied through the contacts of relay RL 3. F
The output terminal of the M demodulation circuit 170 is connected to the contacts of the relay RL5.

The amplifier AMP connected to the speaker SP is connected to the clipper c
rp, a low frequency amplifier AM2, and a power amplifier PA. Power amplifier P A has output 1-Lanceless (
OTL) configuration. The input terminal of the amplifier AMP is
It is connected to one contact of relay RL 2.

The other board of the single microcomputer CPU2 includes a branch connection circuit 180. Relay RL 6 for horn drive
A transistor for controlling relay Rr-7, an inverter for controlling relay Rr-7, and an inverter for driving buzzer BZ are connected. A telephone device, a mobile device TRX, an FM demodulation circuit 170, and an amplifier AMP are connected to the branch connection circuit 180.

In the telephone block, DI is the dial code output terminal, CP is the I200 baud tarokku pulse output terminal, P
S is a power on/off control input terminal, CI is a regulation instruction signal (rOJ: call enabled, rlJ: call disabled) input terminal, l (K
is the hook signal (on-hook/off-hook) output end, T is the transmit audio signal output end, R is the receive audio signal input end, l-'
OW is a power supply terminal. In the mobile station 'rRX, HKI and I(K2) are both hook signal input terminals.The branch connection circuit 180 has relays R[-1, R1, 2,
RL3, RL4 and RI-, 5 are provided, and these are controlled by the microcomputer CPU2.

The microcomputer CPU3 has two videos 7
As V RA H1 and V RAM 2 are connected. CI) u3 is Po1-DBO~DB7
Output of address data and input/output of data are performed via. Address data is latched by a signal from boat ALE and applied to the address boat of VRA old and VRAM2. VRAMI, VRAM
2 is written from CPU3.

When there is a write instruction signal WT or a read instruction signal RD, a memo 17. of the address specified at that timing is generated. Write to or read from.

VRA old and Vr (AM2 is CPU 3's boat P2
Either one is selected depending on the level of the signal from +.

Video full* (VI:<ΔMl, VRAM2), as is generally well known, generates a television scanning synchronization signal, reads out memory data sequentially from different addresses at a predetermined timing in synchronization with that signal, and Image (+
'Output as a T bow. Therefore, if you change the data in the built-in memory, the state of the output image signal will also change, and by loading the specified data into the specified address of this memory, the TV can be used to display specified numbers, characters, etc. An image signal is generated. The image signal and synchronization signal generated in this way are applied to the modulator 2+, 0.220, and output as high frequency modulation (I1) to the transmission line 250 via the mixer 230 etc. VR, AMl The output of VRAM2 is applied directly to the modulator 210, while the output of VRAM2 is applied to the modulator 220 through the contacts of relays R and L8.
Depending on the state of the contact point 8, the output of the VRAM 2 and the output of the rear confirmation television camera TVC are selectively applied.

Input port P27 of CPU 3 is connected to the vehicle's speaker 1.
- A reed switch SS is connected to the meter cable and placed close to a permanent magnet that rotates depending on the vehicle speed.

The boats PIO to P15 of CPU 3 have analog
A digital converter ADC is connected to the input terminal of the ADC, and the output terminal of an amplifier AM3 connected to the fuel gauge is connected to the input terminal of the ADC. CPU3 output capo-1-P ]6 and I]
Connected to 17 are drivers for driving relays RL, 9 and R1-8, respectively.

Microcomputer CPU2 boat P14゜P15
+P16 and CPU3 boat P22. P23 and P24 are connected to each other, and C
PU2 and CF'U3 mutually transmit signals such as commands and data. The microcomputer CPU 3 and its peripheral circuits (display circuit system) are powered on and off by the CPU 2.

- FSK modulation circuit 1 with reference to Figures 3a and 3b;
．． 00's 8 operations will be explained. At the input terminal CLOC,
Microcomputer CPU I output port A L
A constant periodic pulse signal (clock pulse) is generated from E. Counter Z divides the frequency of this clock pulse and outputs two types of signals with different periods. Input end SW
is at the [;' S K signal output permission level (+-+), one of the two outputs (one of M is selected) of the counter z1 according to the level of the signal applied to the data input terminal DIH. , the output terminal DOLC, Dot- with the period of that signal.
The IA level changes binary.

This signal controls on/off of 1-run listers Q1 and Q2, and when they are switched on/off, the capacitor is charged and discharged, and positive and negative polarity signals are generated in the transmission path. That is, since the period of this signal changes depending on the signal level applied to the input terminal DIN of the modulator, it is necessary to input predetermined serial data to DIN.
Then, an FSK signal corresponding to the data is output to the transmission path.

When the port pH is at a low level, a low level L and a high level H are applied to transistors Q1 and Q2, respectively. In this state, transistors Q1 and Q
2 are both turned off and do not output the FSK signal.

If an FSK signal is present on the transmission path, the FSK signal with a predetermined amplitude will be cursed at the output end of the Schmitt 1 Riga STI.

FSK demodulator 1 ], O demodulates this signal and converts it into FS
A binary signal corresponding to the period of the K signal is applied to input port 0 of the CPU 1.

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, the frequency of the FSK signal is set to 50KI+z and 10KI+z.
0KIIz, the center frequency of the FM signal (audio modulation signal) is 1.0.7M)Iz, and the modulators 210 and 22
The frequencies of the signals output by 0 are set to different TV channel frequencies.

A Schmidts 1-1-Riga STI and Sr1 are provided between the FSK demodulator and the transmission line, which remove signal components other than the FSK signal and noise, so the F S
Only the FSK signal extracted from a large number of signals is applied to the K demodulator. The FM demodulation circuit 170 is also equipped with a ceramic filter (band pass filter) CFT, which extracts the FM signal (audio modulation signal) component. Furthermore, tuners TIJI and 1゛U2 have
Each is provided with a tuning circuit that extracts a signal component of a predetermined frequency, and demodulates the signal component from modulators 210 and 220, respectively, and applies the demodulated signal component to monitor televisions TVI and TV2.

A DC voltage for power transmission is applied to the transmission line 250 at the same time as the signal voltage, but since each modulator output terminal and demodulator input terminal are connected to the transmission line 250 via a conducer, no inconvenience occurs. do not. Further, although the battery and power supply circuits 70 and 120 have low impedance, the electric coils L1 and L2 have high impedance with respect to high frequency signals, and these are the battery and power supply circuits 70 and 120.
120, the impedance of the transmission line 250 seen from each modulation circuit and each demodulation circuit is relatively high.

FIG. 6 shows FSK modulation circuits 100 and 150 of the embodiment.
shows the bit ellipse of the transmission signals applied by the microcomputers 80 and 130. To explain with reference to FIG. 6, this signal consists of a mark signal (high level: MJ) for the first 10 bits I and up, and a start pitch 1 for the following 1 bit.
~, 8-bit data and 8-bit BCC code. The 8-bit data is pin-0 to pin-1.
-4 indicates the type of key, beeps 1 to 5 indicate key on/off ("IJ: on,""0": off), and bits 6 and 7 indicate the key group. In this example, the group of keys is A, denoted by ro OJ.

It is divided into three groups: B indicated by "01" and C indicated by [10].

Referring to FIG. 2b, key group A includes numeric keys (0 to 9), #, *, clear key CLR, and hole read key 110, D; key group B includes horn keys; Group C includes a rear confirmation key, a fuel key, a vehicle speed display key (speed), and a call/off key CAL LloFF.

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.

Enter the telephone number of the other party to make the call using the numeric keys * and # on the steering wheel operation board. The microcomputer will now memorize the keyed telephone number.

Wait until the call-off key CALL10FF is pressed.

When the call-off key CAL Llo FF is operated, the person at the other end of the memorized telephone number is automatically called.

When the called party picks up the receiver (off-hook), hands-free communication becomes possible.

If you operate the hold key HOL D at this point, relay RL5 will operate and the microphones MCI and MC2 on the handset, that is, on the steering wheel will
' It will be cut off from the RX and audio will no longer be transmitted from the vehicle.

When the call-off key CALL10FF is operated again, it is determined that the 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 CALL10FF is operated.

When the call-off key CAL L/OF F is operated, the situation is the same as when the telephone receiver is held and hung up, and the voice of the other party is output from the speaker SP, and the microphones MCI and MC2 above the steering control board 1 are output. is connected to the on-board telephone as a transmitter.

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

FIG. 88 and FIG. 8b show the operation of the steering operation board shown in FIG. 3a. The operation of each step of the steering operation board 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 port of the microcomputer 80 are set to initial levels. Through this process, the output capo-hP]1 becomes low level L, and the output of the FSK signal is prohibited.

S2 Key reading signal output port, ie P2O.

Set the data output to P2+ and P22 to the initial value
- to do. This initial data sets the bit corresponding to the output port 1 connected to the row line of the key matrix from which reading starts to be "0" (i.e., low level L), and the other bits to "1" (i.e., high level). H). In this example, in the initial seso 1-, the baud 1-P
The bit corresponding to 20 is set to "0", and the bit corresponding to boat 1]21 and P22 is set to rlJ.

S3 Specified data is sent to boat P20. P21 and P
Output to 22. As a result, one of the boats P20 to P22 becomes a low level, and the other boats become a high level H.

S4 Input port connected to column line of key matrix
1-DBO-Read the level of DB7. Referring to Figure 3d, the input ports DBO to DB7 are pulled up to the power supply line Vcc via resistors, and the output ports DBO to DB7 are pulled up to the power supply line Vcc through resistors.
Since each key is connected in a matrix between 20 to P22 and input ports DBO to DB7, for example, when key 0 of key matrix 90 is pressed, a low level Y is set to output port 20. At the timing of
The levels of entrance capo-1 to DBO to DB7 are different,
l-1, H.

H, H, H, H and H.

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

S6 Enter the key reading data obtained in step S5 as a numerical value O
Compare with. If the value is 0, there is no key manpower and the process proceeds to step S13; otherwise, the process proceeds to step S7.

S7 Save the key read 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, 10 m5ec) necessary for the vibration to subside.

S9 Read the levels of BO1-DBO to DI3'7 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.

Sl+ Step S i Check whether the operation result of O is not 0. If it is not 0, it is assumed that there is no key manpower and the process proceeds to step S13; otherwise, the process proceeds to step S13.
Proceed to step 12.

SI2 output port P20. An 8-bit key code corresponding to the pressed key is generated from the bits of data rOJ of the key reading row signal data output to P2+ and P22 and the data read from the baud hDBo-DB7.

S13 Shift 1- the data "0" bit of the key reading row signal data output to the output ports P20 to P22 to the l-bit adjacent pins 1 to 1.

Check whether 8141 key reading scans are completed. If not completed, the process returns to step S3.

815 There was no key personnel, so the 8-bit code was 0.
The key code is 011 (in hexadecimal).

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

Si2 Step S], calculate the logical sum of each bit of the old key code loaded in 6 and the new key code obtained by the current key reading scan.

818 Check whether the calculation result is 0. If the key is 0, that is, there is no key operation, the process returns to step S2; otherwise, the process proceeds to step S19.

819 Store the newly generated key code in the memory at a predetermined address.

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

821 Check whether a key is pressed or released. Group A keys, ie numeric keys.

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

S22 The buzzer sounds once to confirm the key force.

S23 Check whether the pressed key belongs to a group. 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.

S25 Check whether the data was sent correctly in the data transmission in step 824.

S26 Check whether the pressed key belongs to group C. For the keys of group C, that is, the rear confirmation key, fuel key, vehicle speed display key, and call-off key CALL10FF, data inverted between on and off of the keys is transmitted each time the keys are pressed.

827 Load data indicating the on/off status of group C keys from memory.

From the 828 key code and the data rotated in step S27, a new key code with the on/off state of the group C key reversed is generated. For example, if the state of the call-off key was on in the previous key operation, key code data indicating that the call-off key is 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.

S34 Invert the contents of the memory that stores the on/off status of group C keys.

S32 Depending on the status of the group C key, it can be connected to the output port P15 of the microcomputer 80, or -
RLI, RL2. Performs on/off control of buzzer BZ, etc. Confused by this, the FM modulation circuit 95 and display circuit (T
Vl, TV2. Tul, TU2) are controlled.

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

S34 A key reading error occurred, so the buzzer BZ
will sound three times to notify the driver of the error order.

9a, 9b and 9c show the microcomputer CPU2 (130
) operation. Each operation step will be explained with reference to FIGS. 9a, 9b, and 9c.

S51 The contents of the memory are set as initial values, and the states of each output port of the microcomputer CPU2 are set to initial levels. As a result of this processing, the output capo-1 PI] becomes a low level L, and the output of the FSK signal is prohibited.

352 Check whether the telephone device is off-hook.

S53 @The receiver of the filling machine TE+- is off, so
Output H to output capo-1-HK 20 to turn on relay RL4, output 11 to output capo-1-HK], O,
Output L to output capo-1~Audjo and relay RL 2
and cent off RL3. Now, you can use the same operation as a normal car phone to use @TsumekiGoE 1. can be used.

S54 Load the contents of the memory that stores the hands-free call instruction from the steering wheel operating boat 5°S55 Check whether hands-free call is specified. In the initial state, hands-free calling is not specified, so the process proceeds to step S57. However, when the call-off key CAI, L/○F l" of the steering wheel operation boat is set to on (CALL), hands-free calling is specified. The process advances to step S56.

S56 output port HK 20! -1, turns on relay RL4, and outputs H to output port I-IK10.
Sera 1-L outputs H to output port Audj, o to turn on relays RL2 and RL 3, outputs r4 to PS to output capo-1 and turns on relay RL, I.
- to do. This turns on the power of the telephone GEL and the mobile TRX, turns on the power of the FM demodulation circuit 170, and connects the amplifier A to the sound 547 reception line of the mobile E'RX.
MP is connected.

S57 Outputs L to one output port (1-)+Or-, turns off relay RL5, outputs L from output port HK20, turns off relay R[,4, and outputs output port i
(Set KIO to 14, output capo-hAudio
It outputs L to turn off relays RI, 2 and RT-, 3, and outputs 11 to output ports 1 to PS to turn off relay RLI. This turns off the power of the telephone GEL, the mobile device TRX, and the FM demodulation circuit 170.
Telephone Tl-':r is connected to mobile device TRX.

S58 Receive data from the 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.

S6] It is determined whether the key code 1- is a numeric key, * key, or # key.

S62 Key coat is hold A;-1-(OL D
Determine whether or not.

863 Determine whether the key code is ClearGee-CLR.

S64: Clear the memory address counter that stores the key codes of the numerical keys sent up to that point.

In other words, the previous numeric key input is canceled.

S65 Determine whether the key code belongs to group B.

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

S67 Key coat is key switch on? S68
Now that the horn key has been released, set the horn to off.

S69 Since the horn key was pressed, turn on the horn and perform 1~.

870 Check whether the key code belongs to group C.

S7] Since the key code 1- received as data is not in any of groups A, B, or C, it is treated as a data reception error and the buzzer BZ sounds three times.

S72: Load the contents of the memory that stores the hands-free call instruction from the steering operation board.

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

874 Hold key 1-10 LD Loads the contents of the memory that stores the instruction by D.

S75 110 (on/on/off of the data loaded in S74)
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 "1", that is, a hold instruction.

876 Check whether hold is specified.

S 7 '7 Since hold release is specified, L is output to the output port HOLD and relay RL5 is set to OFF. The signal output terminal of the FM demodulation circuit 170 is now connected to the transmission audio input terminal T of the mobile device TRX, and it becomes possible to talk using the microphones MC1 and MC2 on the steering wheel.

378 Hold is specified, so output port HO
Output H to LD and turn on relay RL 5.
do. Now the output terminal of the FM demodulation circuit 170 and the mobile device TR
X is separated.

S79 Since the key code for the numeric key has arrived, the code is sent to the H CD (Bin) corresponding to the numeric value of the numeric key.
ary Coded Decimal) code and store it in memory at a predetermined address.

S80: Increment the contents of the counter that specifies the memory address for storing the BCD code of the numeric key.

S81 Check whether the key code received from the steering operation board indicates operation of the call-off key CALL10FT. If it is not the call/off key, step 5201 is executed.

S82 Key code is call-off key on (CAL
L) Determine whether it indicates a state.

S83 Since the call-off key has been turned OFF, the contents of the memory storing the hands-free call δ old designation are set to "0" (hands-free call cancelled).

S84 Since the call-off key has been set to CALI-, the contents of the memory storing the hands-free call designation are set to "1" (huff 1 f1 - call designation).

S85 Check whether the handset of the telephone device is disconnected from the GoEL.

S86 Outputs G to output port 1 and K2O, turns on relay RL 4, and outputs 1 to output port HK 1.0.
(Hl is output to output ports 1 to 8 audio, and relays RL2 and RL 3'i are turned on.
-P Output L to S and set relay RLI on. Now, the power of the telephone 1''EL and the 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 receiving 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 determined by checking whether the output terminal CI of the TRX is at a level indicating that communication is possible.

890 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.

893 Convert the BCD code obtained in step S92 to the same code as the dial code generated by telephone 1''EL.

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 896 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 RL 7 is set to OFF to cut off the power supplied to microcomputer CF"U 3 and its surrounding display circuits.

5205 Among the display state memories assigned to the rear confirmation display, fuel display, and qL speed display, those set to non-display this time are set to O'' (non-display).

8206 Since the display has been instructed, relays RL and 7 are turned on to supply power to the CPU 3 and the display circuit around it.

5207 Waits for a predetermined amount of time until the microcomputer CPU3 becomes ready to receive data, that is, from turning on the power to completing the initial settings.

5208 Boat P14. P15 and P'16 are used to transmit an instruction code corresponding to the display that is set to on to the CPU 3.

5209 The code sent by CPU 2 in 5208 is C
Check whether PU3 has received it normally.

Specifically, when the code is transmitted, CP IJ 3 outputs a reception completion code (acknowledge signal) after a predetermined time, so CI) U 2 checks the level of a predetermined input port and receives the signal from CP' U 3. It is monitored whether a call to a predetermined call 1 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 "1" (displaying).

S2] Since a predetermined acknowledge signal does not arrive within a predetermined time in response to the command code sent from I CPtJ2, 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 micro combi coater 80. 1st. The operation of each step will be explained with reference to the Oa diagram.

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 counter.

5103 Output capo + - pit to 1 - turn F
Enable SK signal output, mark, star 1-
P1-1 transmission data and each bit data of the BCC code are output sequentially in synchronization with the taro clock.
to cents.

5104 FS by adding L to output capo-1-pH
Prohibits output of K signal.

5105 Check whether there is data input from the other party's FSK modulation circuit. Without data entry,
Proceed to step 5107.

8106 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 Limit 1 - Decrement the value of the counter by 1 and determine whether the result is O. 51 if not 0
Return to 03, and if it is 0, proceed to 5113.

8108 Again, set H to output capo-1-PLI to enable FSK signal output, and mark.

Continuously outputs each pin 1- of the star 1-pin 1 and an acknowledge ACK+ indicating confirmation of ACKO in synchronization with the clock.

5109 output capo-l-P], set L to 1 to prohibit the output of the FSK signal.

St 10 Check whether an FSK signal has arrived from the other party (receiving side). As will be explained later, if the receiving side receives acknowledgment A and CKI from the transmitting side after outputting the acknowledge ACKO, it will stop outputting the FSK signal, or if it does not receive ACK 1, it will not output the ACKO again. Outputs a signal containing S1<. 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.

Since 5ill A and CK1 have not been received by the receiving side, the value of the limit counter is decremented once and it is checked whether the value is 0 or not. If it is not 0, the process returns to step 8106 and transmits ACKl again, and if it is 0, the process proceeds to step s+i3.

5112 Data transmission was completed within the specified number of times set in the limit counter, so the transmission result code is ○K”
Sera 1-.

5113 Even after data transmission is performed the predetermined number of times set in the limit counter, the data and acknowledge ACKI are not transmitted normally, so the transmission result code is set to II.
Change NG II to Sera 1.

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

SL2+, checks whether the FSK signal has been received, that is, whether data has been input to input capo-1 to TO.

8122 Since data does not come to the human powered boat TO, a code corresponding to no data reception is stored in the data reception memory.

3123 Limits the number of data reception operations for one data transmission or sets a predetermined value to the limit counter.

-8I24 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 8128; otherwise, the process proceeds to 3126.

8126 Since an error has occurred, the limit counter is decremented once and the result is checked to see if it is 0. If not O, return to 5127; if 0, return to 51
Proceed to step 34.

5127 Checks whether there is data input. If there is received data, the process advances to 5124; otherwise, the process advances to 8126.

5128 Data was received normally, so output port-h
Set P11 to H to enable FSK signal output, mark, start pitch 1~, and acknowledge AC.
Each bit of KO is output continuously in synchronization with the clock.

5129 Set L to output port ptt, FSK
Prohibit signal output.

5130 Check whether the FSK signal is received on the receiving side.

5131 Check whether the received data is an acknowledgment ACKI from the transmitting side issued in response to an acknowledge ACKO from the receiving side. ACK], the process advances to S513; otherwise, the process advances to 5132.

5132 Decrement the contents of the limit counter once and check whether the result is 0. If it is not 0, it returns to 8128, and if it is 0, it 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”.
”.

8134 Limit 1 - Even after data transmission is performed the predetermined number of times set in the counter, data and acknowledgement ACKI are not transmitted normally, so N N G II is set as the transmission result code.

FIG. 11 shows a schematic operation of the microcomputer CPtJ3. This will be explained with reference to FIG.

S301 Initialize (clear) the level of the output port and the contents of the memory.

5302 Poe 1~P22. The levels of P23 and P24 are monitored to check whether data is being sent from CPU 2.

5303 Checks the data sent from the CPU 2 and determines whether it is an instruction to display rearward confirmation. If YES, proceed to 5306, and if set to on, set the backward confirmation code to "1" in 5307, if set to off, set it to 83.
08 sets the code to II O+1.

S304. The data sent from the CPU 2 is checked to determine whether it is an instruction to display the vehicle speed. YES
If so, proceed to 5309, and if set to on, proceed to 5310
Set the vehicle speed display code to ``81 II'' with 5311, and set the code to ``0'' with 5311 if the setting is off.

Check the data sent from 8305 CP TJ 2 and determine whether it is a fuel display instruction. If YES, proceed to S 312; if set to on, proceed to 5313
Set the fuel display code to &quot;1&quot;, and in the case of off setting, set the code to &quot;o&quot; in S3]4.

Check the 53isf & direction confirmation display coat.

If this code is "1", proceed to 5316,
Set relays R, L 8 and RL 9 on. In other words, the TV camera TVC's power iJ'+l k is turned on,
Connect the power of the modulator 220 to the output of the TVC. The image of the rear of the vehicle captured by the television camera TVC is now output in the form of a television image signal, and the high frequency signal 48 modulated by this signal passes through the transmission path 250 and reaches the steering control board 1-. This signal is demodulated into the original television signal by the tuner T U 2 on the operation board and applied to the monitor television TV 2.

If the backward confirmation code I is "o" in 5315, 5
Proceeding to 317, relays RL8 and RL9 are set to OFF. This turns off the power to the TVC and connects the output of the video ram VRAM2 to the input terminal of the modulator 220.

8318 Check the vehicle speed display code. When this code is "]", the vehicle speed is displayed.

In other words, first go to 5319 and wait for a predetermined period of time.
The level of 27 is monitored and the number of pulse signals applied during that time is counted. Then at 5320 Karan 1-
The vehicle speed is calculated from the value and predetermined data for displaying the vehicle speed is written into the memory of the VRAM 2 at -5321. VIIAM
2 generates a television signal according to the memory contents, so
A signal containing this vehicle speed display information (numerical value) is applied to the modulator 220 and converted into a high frequency modulation signal, and the (g signal is received by the tuner TU2 of the steering operation board via the transmission line 250). and the vehicle speed is displayed on the monitor TV TV2.If the vehicle speed display code is "o" in the process of 8318, the process proceeds to 5322 to clear the memory contents of the VIIAM2.This clears the display on the TV2.

5323 Check fuel display code 1-. If this code is "]", the fuel display operation is performed.

That is, the process first proceeds to 5324, instructs the analog-to-digital converters A and DC to convert (outputs a signal to F'14), and when the conversion is completed (checks PI3), reads the converted data from PIO to P13. The converted data is converted to numerical data 1; the data is written in a predetermined memory of the old video ram VRA in step 5325 according to the result. Like the VRAM 2, the old VRA sequentially reads the memory contents, generates a television image signal corresponding to the contents, and applies this to the modulator 210.

The high frequency modulation signal outputted from the modulator 210 is outputted to the transmission line 250 through the mixer 230, and this signal is received and demodulated by the tuner TUI of the steering operation board and applied to the monitor television TVI. If the fuel display code is "o" at 5323, the memory of VRAMI is cleared and the display of I'VI disappears.

In the above embodiment, a cathode ray tube display was used as the display, but instead of this, a liquid crystal display, plasma display, EI-display, etc. may also be used on the steering operation board if they are relatively thin. It can be installed.

As described above, the present invention uses a surface display so that various information can be displayed, and since the surface display is placed on the steering wheel, the display is easy to see even if the display is small. . The transmission line also includes various signals.
However, since the signals are converted to different frequencies and output in a superimposed manner, at least one transmission line is required to connect the steering control ball l- and the vehicle body, and the configuration of the transmission line is simple.

[Brief explanation of the drawing]

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 1-1 and 9a showing the operation of the microcomputer CPUI in FIG. 1,
9b and 9c are flowcharts showing the operation of the microcomputer CPU2 in FIG. 1, and FIG. 10a is a flow chart showing the operation of the microcomputer CPU2 in FIG.
Flowchart 1-5 showing the data receiving operation of the microcomputer CPU2.
It is a flowchart 1- showing the operation of U3. 1: Driver seat T1ΣL 2 Telephone 3 Steering wheel 4 Steering operation board 5: Operation panel 38, 41: Support]-39
, 42: Gear 4o: Steering shaft 43: Connection member 44 Niblint board 5j: Insulator plate 1
~ 52.53: Seal 1 Hepley 1- 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:F
SK demodulation circuit 130: Microcomputer 150: FSK modulation circuit 160: FSK demodulation circuit (second demodulation means) 1
70: FM demodulation circuit 180 nib branch connection circuit 2]0. '220: Modulator (second modulation means) TVI,
TV2 CRT display (surface display means) TUI, TU
2: Tuner (first demodulation means) VRAMI, VRA
M2: Video ram (display signal generation means) TVC: Television camera (display signal generation means) MCI, MC2: Microphone SAI, SA2: Sliding BAI, BA2. : Brush LL, L2: Electric coil TR
X: Mobile device DFA: Differential amplifier SP: Speaker Patent applicant Aisin Seiki Co., Ltd. and 1 other name Figure 28 Figure 2b

Claims (5)

[Claims] (1) At least one surface display means installed on the steering wheel or near the steering wheel. A first demodulation means for giving a signal to the nine-surface display means, a switch means, and modulation with a signal according to the operation of the switch means. A steering operation board equipped with a first modulation means for performing the following: Display signal generation means mounted on the vehicle body and outputting two-dimensional information; A first modulation means for performing modulation with the two-dimensional information from the display signal generation means; a second modulation means that outputs a signal of a different frequency from the signal emitted by the first modulation means, a second demodulation means that demodulates the signal modulated by the first modulation means, and a display signal generated according to the signal from the second demodulation means. an on-board control device comprising an electronic control device for controlling the means; and at least one set of electrical connection means consisting of a brush and a slip link, each of which prevents alternating current with the power line of the on-board control device and the power line of the steering operation board; a transmission means electrically connected to the first modulation means, the first demodulation means, the second modulation means and the second demodulation means through a DC blocking means; , on-vehicle display device. (2) The electrical connection means of the transmission means includes first and second brushes attached to the steering wheel facing in opposite directions, and a first slip facing the first brush and fixed to the steering operation board. ring. 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 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. (4) The on-vehicle display device according to claim (1), wherein the slip ring is covered with an annular ground conductor. (5) The display signal generating means has a plurality of signal sources and changeover switch means, and the electronic control device of the vehicle control device switches the switch means in response to the signal from the second demodulation means. An on-vehicle display device according to claim (1).