JPS59160329A - Transmitter for steering operation board signal - Google Patents

Abstract

PURPOSE:To prevent the structure of a steering wheel part from becoming complicate and increasing in capacity by arranging only irreducible necessary devices on a steering operation board. CONSTITUTION:A constant voltage power source device 70, microcomputer unit 80 which controls operation on the steering operation board, key switch 90, FMS modulating and demodulating circuits 100 and 110, microphone MC, differential amplifier DFA, FM modulator 95, monitor television TV as a surface display device, tuner TU, distributor 190, etc., are arranged on the steering operation board. Then, other circuits or a control unit is arranged on the side of a vehicle body. The both are connected together by the connecting mechanism consisting of a slip ring SA and brushes BA.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to signal transmission for transmitting signals between a device on a vehicle body and a steering operation board near a steering operation wheel, and in particular, the present invention relates to signal transmission for transmitting signals between a device on a vehicle body and a steering operation board near a steering operation wheel.
The present invention relates to steering operation boat signal transmission in which a digital signal such as a shift key signal and an analog signal such as an audio signal are transmitted on the same transmission line.

In a vehicle, the steering wheel is closest to the driver, and it is also closest to the driver's hands, so in order to improve operability, the operation board equipped with key switches for controlling on-board equipment should be placed in the center of the steering wheel. It is preferable to equip it in the department.

However, since the steering mechanism that transmits the rotation of the wheel to the steering shaft is complicated, it is difficult to wire a signal cable that connects an operation board (steering operation board) installed in the center of the steering wheel and a fixed control unit. The applicant has developed a method (Japanese Patent Application No. 132926/1983) in which a slip ring and a brush are used to connect an operation board and a fixed control unit, and power and signals are transmitted through the line. Proposed.

According to this, signals and power can be transmitted between the operation board and the fixed control unit without using a large number of lines.

By the way, when a wireless communication device is installed on a vehicle, the communication device must be installed at a considerable distance from the person making the call, such as the driver. When making a communication device by separating the talking part from the main body of the communication device and connecting the talking part and the main body of the communication device with a cord, the talking part is removed from the main body of the communication device and brought closer to the person making the call. However, when the driver wants to talk on the phone, he or she must hold a microphone or the like with one hand, which means that the driver must drive with one hand, which is dangerous. Since the driver has the most opportunities to talk on the phone in a vehicle, it is desirable to enable the driver to talk on the phone safely while driving.

Therefore, if the microphone is placed on the steering wheel, the microphone is close to the driver's mouth, so the driver can talk without having to hold the microphone in his hand. However, in this case, since the signal from the keyboard is a digital signal and the signal from the microphone is an analog signal, wiring between the steering operation board and the fixed control unit is difficult. For example, if you try to transmit analog signals, digital signals, and power using separate transmission lines, you will need three transmission lines, but even if you use a mechanism that combines slip rings and brushes for this connection, the connection The structure of the mechanism becomes quite complex.

The first object of the present invention is to arrange a microphone on the steering operation board to faithfully transmit the driver's voice to the fixed control unit, and to simplify the connection between the steering operation board and the fixed control unit. the second
The purpose of

In order to achieve the above object, in the present invention, a microphone, an analog modulator for audio signals, and a digital modulator for key human input signals are provided on the steering operation board, and an analog demodulator and a digital demodulator are provided on the fixed control unit side. is provided to perform control according to the output of the digital demodulator, and apply the output signal of the analog demodulator to a communication device or the like. The frequencies are set to different values for the analog modulation signal and the digital modulation signal, and these signals are placed on the same transmission line. The output end of the digital modulator is coupled to the transmission line via a capacitor, and a delay means, such as a capacitor, that delays the rise of the signal is connected to the output end of the digital modulator.

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.
1), key switch 90, FSK modulation/demodulation circuit 100,1
10, microphone MC1, MC2, differential amplifier DFA
, FM modulator 95, two screen displays, namely monitor televisions TV1, TV2 . Tuners TU1, TU2. Distributor 1
It is equipped with 90 mag.

The microbons MC1 and MC2 are arranged facing the same direction (towards the mouth of the driver) at a predetermined interval, and their output terminals are connected to different input terminals of the differential amplifier DFA. As a result, the difference between the sound applied to the microphone MC1 and the sound applied to the microphone MC2 is amplified by the DFA, so that a large output can be obtained for the sound coming from the arrangement direction of MC1 and MC2, 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 applied to the FM modulator 95.

In this embodiment, the control unit on the vehicle body side includes a constant voltage power supply device 120. Microcomputer unit 130
(CPU2), FSK modulation/demodulation circuit 150.160. FM
Demodulation circuit 170. Telephone TEL.

Radio communication device TRX for mobile device or telephone, branch connection circuit 180. Amplifier AMP, speaker SP, display microcomputer unit 200 (CPU3),
Video RAM VRAM1, VRAM2. Modulator 210,2
20. It is equipped with a television camera TVC, mixer 230, etc.

The transmission path 250 includes a slip link SA1 and a brush BA.
Connection mechanism consisting of 1, 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, an FM modulation circuit 95, and a distributor 190 are each connected to the transmission line through a capacitor, and a stabilized power supply circuit 70 is connected through an electric coil L1. On the main body side of the vehicle, FSK modulation/demodulation circuit 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.

A telephone TEL is arranged on the left side of the driver seat 1, and a speaker SP is arranged 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. The front panel 5 of the steering operation board 4 has display screens for two monitor televisions TV1 and 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 TV1 and TV2.

FIG. 2c schematically shows how the steering wheel 3 and the steering operation board are attached to 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. sabot 41
is fixed to a steering shaft 40, and the steering wheel 3 is connected to a support 41. The support 41 rotatably supports the 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 mesh.

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.
etc. do not rotate. That is, in the case of this embodiment, when the steering wheel 3 is rotated, the support 41 and the steering shaft 40 are rotated to perform steering operation, but since the gears 43a and 43b and 39 and 42 have the same number of teeth, the support 41 and the steering shaft 40 rotate. Connecting member 4 by rotation of 41
Support 41 and gear 3 generated by arc-shaped movement of 3
9 relative movement amount (angle), and support 41 and gear 4
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.

The steering wheel 3 is equipped with two brushes BA1 and BA2 that are electrically connected to each other. Brush B
Brush A1 has one end in contact with a slip ring SA1 provided on the steering operation board side, and brush BA2 has one end in contact with a slip ring SA2 provided on the vehicle fixed side.

FIGS. 2d and 2e show details of the structure near the slip ring SA1. The explanation will also be made with reference to FIGS. 2d and 2c. In this example, slip rings SA1, S
Electromagnetic shielding is provided to prevent the S/N ratio from decreasing due to electromagnetic waves emitted from A2 and the like. That is,
The slip ring SA1 is attached to four parts of a resin insulator plate 51 having four parts of a predetermined width formed into a ring shape.
A conductor shield plate 52 wraps around the plate 51.
and 53 are installed. The shield plate 53 is
The grooves 51a and 51b of the insulator plate 51 are fixed to the grooves 51a and 51b. The brush BA1 has a resin collar 54 attached to its tip, passes through the hole 53a of the shield plate 53, and is constantly in contact with the slip ring SA1 due to the pressing 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 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 shaft 40, respectively.

FIG. 3a shows the configuration of the electric circuit of the steering operation board 2. 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 consists of a large number of key switches connected in a matrix to P21 and P22 and eight input ports DB0 to DB7. These key switch contacts are opened and closed by operating predetermined portions on the operation panel 5.

In this example, the FSK modem 100, 110 is a one-deep circuit, and its internal structure is shown in detail in FIG. 3b. 100 is an FSK modulator,
110 is an FSK demodulator.

Note that Z1 and Z shown inside the FSK modem 100 and 110
2 and Z3 are MC140 manufactured by Motorola, respectively.
40, MC14018 and MC14040.

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

The terminal CLOC 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. The terminals DOLC and D○HA are the input terminal for the signal that controls the output of the FSK signal. signal output end,
Terminal SIN is an FSK signal input terminal, and SOUT is a demodulated binary data output terminal.

Terminals COTC and DIN of FSK modem 100 and 110
, SW and SOUT are respectively port P of CPU1.
11, P10, ALE and T0, and complementary output transistors Q1 and Q2 are connected to modulation output terminals DOLC and DOHA. Transistor Q1
, Q2 are connected to a transmission line to slip ring SA1 via a protective resistor R1 and capacitor C1. Also, a capacitor C2 of relatively small capacity is connected between this output line and the ground line. This capacitor C2 is for delaying the rise of the pulse signal.

That is, when the FSK modulation output end is coupled to the transmission line 250 with the capacitor C1, a differential pulse is generated on the transmission line at the rise and fall of the FSK pulse signal, but the rise of this differential pulse is rapid, and this pulse Since the frequency of the harmonics of the signal extends to the frequency of the audio modulation signal (FMM output signal), in order to prevent pulse noise from being superimposed on the audio signal, capacitor C2 delays the rise of the differential pulse signal to generate higher-order signals. Attenuates harmonic components. When transmitting a digital signal and an analog signal in a superimposed manner on one transmission path, the amplitude of the analog modulated signal must be made smaller than that of the digital modulated signal in order to eliminate transmission errors in the digital signal. In such a case, the harmonic signal of the digital differential pulse is likely to affect the audio signal. If each pulse of the digital modulation signal (FSK signal) is converted into a sine wave and then applied to the transmission line 250, this problem can be eliminated, but if this is done, the circuit configuration must be complicated. Note that the resistor R1 may be omitted.

A buzzer BZ is connected to the output port P14 of the microcomputer CPU1 via an inverter, and relays RL1 and RL2 are connected to the output ports P15 and P18, respectively, via inverters.

The two output ends of the distributor 190 are connected to tuners TU1 and TU2, which are connected to monitor televisions TV1 and TV2, respectively. Tuners TU1 and TU2 are tuned to the frequency of the high frequency signals output from modulators 210 and 220, respectively. tuner TU1,
An input end of a stabilized power supply circuit that supplies power to TU2 and monitor televisions TV1 and TV2 is connected to a power supply line via a contact point of relay RL2.

The contacts of relay RL1 are connected to the input terminal of a stabilized power supply that supplies power to the audio signal circuit and the 12V power supply line.

Microphones MC1 and MC2 are connected to a differential amplifier DFA composed of an operational amplifier. Differential amplifier DF
A bypass filter HPF configured using an operational amplifier is connected to the output terminal of A. A low-pass filter LPF configured using an operational amplifier is connected to the output end of the HPF. The output signal of the low-pass filter LPF is amplified by the amplifier AMP and applied to the input terminal Audio jn of the FM modulator FMM via a capacitor. FMM
A predetermined direct current bias voltage is applied to the input terminal Audio in of the variable resistor VR1. variable resistor VR
1 is for setting the center frequency of the FM modulated wave.

The FM modulator FMM is constructed 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 circuitry of the device on the vehicle body. This will be explained with reference to FIGS. 4a and 4b. The microcomputer CPU2 includes an FSK modem 1 having the same configuration as the modems 100 and 110 shown in FIG. 3b.
50 and 160 are connected. The output terminal of the FSK modulator 150 is connected to the transmission line 250 via a driver, a protective resistor R2, a coupling capacitor C3, etc., and the output terminal of the driver is connected to a delay circuit as well as the steering operation board side. Connect capacitor C4. FSK demodulator 16
The input end of 0 is connected to a transmission line 250 leading to the slip ring SA2 via an input circuit consisting of a Schmitt trigger S lower 2, etc.
It is connected to.

The input end of the FM demodulation circuit 170 is connected to the slip ring SA2. The FM demodulation circuit 170 includes a ceramic filter CFT, an integrated circuit FMD for FM signal demodulation, a low frequency amplifier AM1, and the like. Power to the FM demodulation circuit 170 is supplied through the contacts of relay RL3. FM
The output end of demodulation circuit 170 is connected to the contact of relay RL5.

The amplifier AMP connected to the speaker SP is connected to the clipper CL.
It consists of a low frequency amplifier AM2 and a power amplifier PA. Power amplifier PA has an output transformerless (OTL) configuration. The input terminal of amplifier AMP is connected to relay RL.
Connect to one contact of 2.

The other ports of the microcomputer CPU2 include a branch connection circuit 180. A transistor that controls the horn drive relay RL6, an inverter that controls the relay RL7, and an inverter that drives the buzzer BZ are connected. The branch connection circuit 180 is connected to a telephone device TEL, a mobile device TRX, an FM demodulation circuit 170, and an amplifier AMP.

In the telephone TEL block, DI is the dial code output terminal, CP is the 1200 baud tarok pulse output terminal, PS is the power on/off control input terminal, and CI is the restriction instruction signal ("0": call possible, "1": (Unable to talk) Input terminal, TK
is the hook signal (on-footer/off-hook) output end, T is the transmit audio signal output end, R is the receive audio signal input end, POW
is the power supply end. HK1 and H at mobile device TRX
Both K2 are hook signal input terminals. Branch connection path 180 includes relays RL1, RL2 . RL3, RL4
and RL5, which are controlled by the microcomputer CPU2.

Two video rams VRAM1 and VRAM2 are connected to the microcomputer CPU3. CPU3 is
Address data is output and data is input/output via ports DB0 to DB7. The address data is latched by a signal from port ALE and stored in VRAM1.
, is applied to the address port of VRAM2. VRAM
1. VRAM2 receives write instruction signal WT from CPU3.
Alternatively, when there is a read instruction signal RD, writing or reading is performed to or from the memory at the specified address at that timing.

One of VRAM1 and VRAM2 is selected depending on the level of the signal from port P21 of CPU3.

As is generally well known, the video RAM (VRAM1, VRAM2) generates a television scanning synchronization signal, reads memory data sequentially from different addresses at a predetermined timing in synchronization with the signal, and converts it into an image signal. Output. 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, and as high frequency modulation signals,
The signal is output to the transmission line 250 via the mixer 230 and the like. V
The output of RAM1 is directly applied to the modulator 210,
The output of VRAM2 is applied to modulator 220 via the contacts of relay RL8.

The output of the VRAM 2 and the output of the rear confirmation television camera JVC are selectively applied to the signal input terminal of the modulator 220 depending on the state of the contact of the relay RL8.

A reed switch SS is connected to the human-powered boat P27 of the CPU 3, which is connected to the speed meter cable of the vehicle and placed close to a permanent magnet that rotates in accordance with the vehicle speed. CPU
An analog-to-digital converter ADC is connected to ports P10 to P15 of No. 3, and the output end of an amplifier AM3 connected to the fuel analyzer is connected to the input end of the ADC. C
Drivers that drive relays RL9 and RT8 are connected to output ports P16 and P17 of PU3, respectively.

Boats P14 and P15 of micro combi coater CPU2
, P16 and port P22 of CPU3. P23 and P24 are connected to each other, and C
The PU2 and CPU3 mutually transmit signals such as commands and data. The microcomputer CPU3 and its peripheral circuits (display circuit system) are powered on and off by the CPU2.

With reference to FIGS. 3a and 3b, the FSK modulation circuit 10
The general operation of 0 will be explained. A fixed-cycle pulse signal (clock pulse) is applied to the input terminal CLOC from the output port ALE of the microcomputer zCPU1. Counter Z1 divides this clock pulse and outputs two types of signals with different periods. When the input terminal SW is at the FSK signal output permission level (H), one of the two output signals of the counter Z1 is selected according to the level of the signal applied to the data input terminal DIN, and the period of that signal is output end D
The levels of OLC and DOHA change in a binary manner.

This signal controls on/off of transistors Q1 and Q2, and when the transistors are switched on/off, the capacitor is charged and discharged, and positive and negative signals are generated in the transmission path. In other words, the period of this signal changes depending on the signal level set at the input terminal DIN of the modulator, so if predetermined serial data is set at DIN, an FSK signal corresponding to that data will be output to the transmission line. Ru.

When port P11 is at low level L, transistor Q1
A low level L and a high level H are applied to Q2 and Q2, respectively. In this state, both transristors Q1 and C2 are turned off and do not output the FSK signal.

When an FSK signal is present on the transmission path, the Schmitt trigger S
At the output of T1, an FSK signal of a predetermined amplitude appears. F
The SK demodulator 110 demodulates this signal and applies a binary signal corresponding to the cycle of the FSK signal to the human power port T0 of the CPU 1.

FIG. 5 shows an outline of signal waveforms at each part of the device.

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 50 KHz and 100 KHz.
KHz, the center frequency of the FM signal (audio modulation signal) is 10.7 MHz, and the frequencies of the signals output by modulators 210 and 220 are set to different television channel frequencies.

Schmitt triggers ST1 and ST2 are provided between the FSK demodulators 110 and 160 and the transmission line, respectively, and these remove signal components other than the FSK signal and noise. Only the extracted FSK signal is applied.

Further, the FM demodulation circuit 170 is equipped with a ceramic filter (band pass filter) CFT.

This extracts the FM signal (audio modulation signal) component.

Further, tuners TU1 and TU2 are each equipped with a tuning circuit that extracts a signal component of a predetermined frequency.
The signal components from modulators 210 and 220 are demodulated and applied to monitor televisions TV1 and TV2, respectively.

A DC voltage for power transmission is applied to the transmission line 250 at the same time as the signal voltage, but since the output end of each modulator and the input end of the demodulator are connected to the transmission line 250 via a capacitor, this does not cause any inconvenience. do not have. Further, although the impedance of the battery and power supply circuits 70 and 120 is low, the electric coils L1 and L2 have high impedance with respect to the same frequency signal, and these are connected to the battery and power supply circuit 70,
120, the impedance of the transmission line 250 seen from each modulation circuit and each demodulation circuit is relatively high.

In this example, capacitors C2 and C4 are connected to the output terminal of the FSK modulation circuit, so the rise of the FSK signal applied to the transmission line 250 is relatively gentle. As shown by the dashed line in FIG. 5, a differential signal with a sharp rise is applied to the transmission line 250, and a sharp pulse signal appears in the input signal of the FMD at the timing of the rise of the differential signal.

FIG. 6 shows FSK modulation circuits 100 and 150 of the embodiment.
shows the pit configuration of the transmission signals applied by the microcomputers 80 and 130. Explaining with reference to FIG. 6, this signal consists of a first 10-bit mark signal (high level: "1"), followed by a 1-bit start bit, 8-bit data, and an 8-pin BCC code. ing. In the 8-pit data, bits 0 to 4 indicate the key type, and bit 5 indicates the key on/off (“1
" indicates on, "0" indicates off), and pits 6 and 7 indicate key groups. In this example, the key group is A, denoted by "00".

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

Referring to Figure 2b, key group A is the numerical keys (0-9), #, *, clear key CLR and hold key HOLD, key group B is the horn key, and key group C is the backward key. confirmation key, fuel key,
Vehicle speed display key (speed) and call/off key CA
LL/OFF.

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 person you want to call using the numeric keys * and # on the steering wheel operation board, and the microcomputer stores the entered telephone number.

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

When the call-off key CALL/OFF is operated, the person on the other end of the stored telephone number is automatically called.

When the called party hangs up the receiver (off-hook), a hands-free call becomes possible.

Note that when the hold key NOLD is operated, relay RL5 is activated, and the microphones MC1 and MC2 on the handset, that is, on the steering wheel, are connected to the mobile device TRX.
The vehicle will no longer be able to transmit audio.

When the call-off key CALL/OFF 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 CALL/OFF is operated.

When the call-off key CALL/OFF 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 MC1 and MC2 on the steering operation board are used as transmitters in the car. connected to the top phone.

When the call-off key CALL/OFF 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 operation board will be described with reference to FIGS. 8a and 8b.

S1: The contents of the memory are set as initial values, and the status of each output port of the microcomputer 80 is set to the initial level.

As a result of this processing, the output port P11 becomes low level L, and output of the FSK signal is prohibited.

S2 Key reading signal output port ie P20, P21
And the data output to P22 is set to the initial value.

This initial data sets the pit corresponding to the output port connected to the row line of the key matrix to start reading to "0".
” (that is, low level L) and set the other focus to “1”.
(ie, high level H). In this embodiment, the bit corresponding to boat P20 is set to "0" and the bit corresponding to boats P21 and P22 is set to "1" in the initial setting.

S3 Specified data to boats P20, P21 and P2
Output to 2. As a result, one of the boats P20 to P22 becomes a low level L, and the other boats become a high level H.

S4 Read the levels of input ports DB0 to DB7 connected to the column lines of the key matrix. Referring to FIG. 3a, input ports DB0 to DB7 are pulled up to the power supply line Vcc via resistors, and output ports P20 to DB7 are pulled up to the power supply line Vcc through resistors.
Since each key is connected in a matrix between P22 and the input ports DB0 to DB7, for example, when key 0 of the key matrix 90 is pressed, the input port P20 is set to low level L. Boat DB
The levels of 0 to DB7 are L, H, and H, respectively.

H, H, H, H and H.

S5 I/O of each pit of the data read in step S4
Invert O. In other words, take the complement.

S6 Compare the key reading data obtained in step S5 with the numerical value 0. If the numerical value is 0, there is no key input 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 msec) necessary for the vibration to subside.

S9 Read the levels of ports DB0 to DB7 again. S
10 Calculate the OR of each pit between the value read in step S9 and the value saved in the memory in step S7.

S11 Check whether the calculation result in step S10 is not 0. If it is not 0, it is assumed that there is no key human power and the process proceeds to step S13; otherwise, the process proceeds to S12.

S12 Data "0" pit of key reading line signal data output to output ports P20, P21 and P22,
An 8-bit key code corresponding to the pressed key is generated from the data read from the ports DBO to DB7.

S13 Shift the data "0" bit of the key reading line signal data output to the output ports P20 to P22 to the adjacent pit by one bit.

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

S15 There was no key manpower, so 8-bit code 00
Let H (in hexadecimal notation) be the key code.

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

S17 Calculates the logical sum of the old key code loaded in step S16 and the new key code obtained in the current key reading scan for each pill.

S18 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.

S19 Store the newly generated key code in the memory at a predetermined address.

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

S21 Check whether the key is pressed or released. Group A keys, ie numeric keys.

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

S22 The buzzer sounds once to confirm the key force.

S23 Check whether the pressed key belongs to group B. Group B keys, or 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 S24.

S26 Check whether the pressed key belongs to group C. Group C keys: rear confirmation key, fuel key, vehicle speed display key, and call-off key C
Regarding ALL/OFF, each time a key is pressed, data that inverts the on/off state of the key is transmitted.

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

S28 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.

S32 Depending on the state of group C key, relay RL connected to output port P15 of microcomputer 80
1, RL2. Performs on/off control of buzzer BZ, etc.

As a result, the FM modulation circuit 95 and the display circuit (TV1
, TV2. TU1, TU2) are controlled.

S33 An error occurred in data transmission, so the buzzer BZ
sounds twice to notify the driver that an error has occurred.

S34: Since a key reading error has occurred, the buzzer BZ sounds three times to notify the driver of the error occurrence.

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 status of each output port of the microcomputer CPU2 is set to the initial level. Through this process, the output port P11 is set to a low level L.
, and the output of the FSK signal is prohibited.

S52 Check whether the telephone receiver is off the hook.

S53 Since the telephone receiver is off the hook, output H to output port HK20 to turn on relay RL4, output H to output port HK10, and output port Aud.
io and outputs L to set relays RL2 and RL3 off. Now you can use the telephone TEL in the same way as a normal on-board telephone.

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

S55 Check whether the hands-free call is specified.

In the initial state, hands-free calling is not specified, so the process proceeds to step S57, but when the call-off key CALL/OFF on the steering wheel operation boat is turned on (CAL
If set to L), a hands-free call is designated and the process advances to step S56.

S56 Output H to output port HK20 and relay RL
4, set H to output boat HK10, output H to output boat Audio, and connect relays RL2 and R.
Turn on T3, output L to output port PS, and relay R
Set L1 on. Now, the power of the telephone TEL and the mobile device TRX is turned on, the power of the FM demodulation circuit 170 is turned on, and the amplifier A is connected to the audio receiving line of the mobile device TRX.
MP is concubined.

S57 Output L to output boat HOLD and relay RL
5, output L to output port HK20, turn off relay RL4, set output port HK10 to L,
Outputs L to the output port Audio to turn off relays RL2 and RL3, and outputs H to the output port PS to set relay RL1 to OFF. This turns off the power of the telephone TEL, the mobile device TRX, and the FM demodulation circuit 170, and the telephone TEL and the mobile device TRX are connected.

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 steering operation board 2 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 TOLD.

S63 Determine whether the key code is clear key CLR.

S64 Clear the address counter of the memory 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 The key code of group B is determined.

S66 It is determined whether the key coat corresponds to a horn key.

S67 Key code is key switch on? S68 The horn key has been released, so set the horn to OFF.

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

S70 Check whether the kill code is in 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.

S72 Loads 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.

S74: Load the contents of the memory that stores the instruction by the hold key HOLD.

S75 Invert the I/O (on/off) of the data loaded in S74 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.

S76 Check whether hold is specified.

S77 Since hold release was specified, output port H
Outputs L to OLD and sets relay RL5 to OFF. The signal output end of the FM demodulation circuit 170 is now connected to the mobile device TR.
The microphones MC1 and MC2 on the steering wheel are connected to the transmitting audio input terminal T of the steering wheel.

S78 Hold is specified, so output port HOL
Output H to D and set relay RL5 to ON. This disconnects the output end of the FM demodulation circuit 170 from the mobile device TRX.

S79 Since the key code for the numeric key has arrived, the code is transferred to the BCD (Binar) corresponding to the numeric value of the numeric key.
y Coded Decimal) code and store it in the memory at a predetermined address.

S80: Increment the contents of the counter that specifies the memory address for storing 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 CALL/OFF. If it is not the call/off key, step S201 is executed.

S82 The key code is the call-off key on (CALL
) It is determined whether the condition is indicated or not.

S83 Since the call-off key is set to OFF,
Set the contents of the memory that stores the hands-free call designation to "0".
(Hands-free call cancellation).

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

S85 Check whether the receiver of the telephone TEL is disconnected from the telephone.

S86 Output H to output port HK20 and relay-RL
4, set H to output port HK10, output H to output port Audjo, and turn on relays RL2 and R.
Turn on L3, output L to output port PS, and relay R
Set L1 on. Now, the power of the telephone TEL and the mobile device TRX is turned on, the power of the FM demodulation circuit 170 is turned on, and the amplifier A is connected to the audio receiving line of the mobile device TRX.
MP is connected.

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

S88 Check whether the mobile device TRX is powered on.

S89 Check whether the vehicle is in a position where communication is possible (whether radio waves can be received). This is determined by checking whether the output terminal CI of the TRX is at a level indicating a communication tube.

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 designation of hands-free call to "0" (cancellation of hands-free call).

S92: The contents of the memory storing the 4-bit BCD code of the numerical value input using the numerical key are successively loaded into a predetermined register from the address specified by the numerical pointer (address counter).

S93 Telephone the BCD code obtained in step S92.
Converts to the same code as the dial code generated by EL.

S94 In synchronization with the pulse signal output from the CP terminal of the mobile device TRX, the dial code obtained in S93 is sequentially
Output to I terminal.

S95: Increment the value of the numerical pointer once.

S96 Check whether all BCD codes have been read from memory. This is determined by looking at the value of the numerical pointer. If not completed, the process returns to step S92 and reads the BCD code using the next numerical pointer.

S201 Check whether a key related to the television display, ie, a rear confirmation key, a fuel key, or a vehicle speed display key, has been pressed.

S202 It is determined whether the current key operation is to set the display on or off.

S203 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).

S204 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.

S205 Among the display state memories assigned to the rear confirmation display, fuel display, and vehicle speed display, those that are set to be hidden this time are set to "0" (non-display).

S206 Since the display is instructed, relay RL7 is turned on to supply power to the CPU 3 and the display circuit around it.

S207: Wait for a predetermined period of time required until the microcomputer CPU3 becomes ready to receive data, that is, from when the power is turned on until the initial settings are completed.

S208 Boat P14. Use P15 and P16 to CP the instruction code corresponding to the display that is set to on.
Transmit to U3.

S209 The code sent by CPU2 in S208 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 period of time.
2 checks the specified input port after sending the code, and
It is monitored whether a predetermined code from U3 is received within a predetermined time.

S210 Among the display state memories assigned to the rear confirmation display, fuel display, and vehicle speed display, the content of the one set for display this time is set to "1" (displaying).

S211 Since a predetermined acknowledge signal does not arrive within a predetermined time for the command code sent from CPJ2, 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.

S101 Generate an 8-bit CRC check character BCC for the data to be transmitted.

S102 A predetermined value is set in a limit counter that limits the number of data transmissions.

S103 Set output port P11 to H to enable FSK signal output, mark, start focus,
The transmission data and each bit data of the BCC code are sequentially set in the output port P10 in synchronization with the clock.

S104 Set L in the output port P11 to prohibit output of the FSK signal.

S105 Check whether there is data input from the other party's FSK modulation circuit. Without data entry,
The process advances to step S107.

S106 Check whether the data sent from the other party has an acknowledge ACK0 indicating data reception confirmation. As will be explained later, when data is transmitted, the receiving side outputs ACK0 to the transmitting side.

S107 Decrement the value of the limit counter and determine whether the result is 0 or not. If not 0, S103
If the value is 0, the process proceeds to S113.

S108 Set H to output boat P11 again and press F.
The SK signal can be output, and the mark, start bit, and each bit of acknowledge ACK1 indicating confirmation of ACK0 are continuously output in synchronization with the clock.

S109 Set L to output port P11, FSK
Prohibit signal output.

S110 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 ACK1 from the transmitting side after outputting the acknowledge ACK0, it will stop outputting the FSK signal, but if it does not receive the ACK1, it will output the FSK signal again including the ACK0. Output a signal. However, the fact that the FSK signal comes from the receiving side means that data A is coming from the transmitting side.
This means that CK1 is not received by the receiving side.

S111 Since ACK1 has 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 S106 and transmits ACK1 again, and if it is 0, the process proceeds to step S113.

S112 Data transmission was completed within the predetermined number of times set in the limit counter, so the transmission result code is “OK”.
” to cents.

S113 Even if the data is transmitted the predetermined number of times set in the limit counter, the data and acknowledge ACK1 are not transmitted normally, so the transmission result code is “N”.
Set "G".

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. 10b.

S121 Check whether the FSK signal has been received, that is, whether data has been input to the input port T0.

S122: Since no data comes to the human-powered boat T0, a code corresponding to "no data reception" is set in the data reception memory.

S123 A predetermined value is set in a limit counter that limits the number of data reception operations for one data transmission.

S124 CRC check character B from received data
Generate CC.

S125 The BCC value of the received data is compared with the BCC value generated in step S124. If the two are equal, it is determined that the data has been received correctly and the process proceeds to step S128; otherwise, the process proceeds to S126.

S126 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 S127; if 0, S134
Proceed to.

S127 Check whether there is data input. If there is received data, the process advances to S124; otherwise, the process advances to S126.

S128 Since the data was received normally, the output port P
11 to H so that the FSK signal can be output, and the mark, start bit, and acknowledge ACK0
Continuously outputs each bit in synchronization with the clock.

S129 Set L to output port P11, FSK
Prohibit signal output.

S130 Check whether the FSK signal is received on the receiving side.

S131 Check whether the received data is an acknowledgment ACK1 from the transmitting side issued in response to acknowledge ACK0 from the receiving side. If ACK1, the process advances to S133; otherwise, the process advances to S132.

S132 The contents of the limit counter are incremented once and it is checked whether the result is 0 or not. If it is not 0, the process returns to S128, and if it is 0, the process proceeds to S134.

S133 Data transmission has been completed within the predetermined number of times set in the limit counter, so the transmission result code is “OK”.
”.

S134 Even if the data is transmitted the predetermined number of times set in the limit counter, the data and acknowledge ACK1 are not transmitted normally, so the transmission result code is “N”.
Set "G".

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

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

S302 Monitor the levels of boats P22, P23 and P24 and check whether data is being sent from the CPU2.

S303 Check the data sent from CPU2,
Determine whether the instruction is for rear confirmation display. If YES, the process advances to S306, and in the case of ON setting, the backward confirmation code is set to "1" in S307, and in the case of OFF setting, the code is set to "0" in S308.

S304 Check the data sent from CPU2,
Determine whether the instruction is to display the vehicle speed. If YES, S
The process proceeds to step 309, and in the case of the ON setting, the vehicle speed display code is set to "1" in S310, and in the case of the OFF setting, the code is set to "0" in S311.

S305 Check the data sent from CPU2,
Determine whether the fuel display is an instruction. If YES, S
The process proceeds to step 312, and if the setting is on, the fuel display code is set to "1" in step S313, and if the setting is off, the fuel display code is set to "1" in step S314.
Set that code to “0”.

S315 Check the rear confirmation display code.

If this code is "1", the process advances to S316 and relays RL8 and RL9 are set on. That is, the power of the television camera TVC is turned on, and the input of the modulator 220 is connected to the output terminal of the TVC. Now TV camera TVC
The image of the rear of the vehicle captured by the camera is output in the form of a television image signal, and a high-frequency signal modulated by this signal is sent to the transmission line 2.
50 to reach 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.

If the backward confirmation code is “0” in S315, S317
Proceed to set relays RL8 and RL9 to OFF.

This turns off the TVC power and connects the output of the video ram VRAM2 to the input terminal of the modulator 220.

S318 Check the vehicle speed display code. When this code is "1", the vehicle speed is displayed.

That is, the process first proceeds to S319, and input port 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, in S320, the vehicle speed is calculated from the count value, and in S321, predetermined data for displaying the vehicle speed is written in the memory of the VRAM2. Since the VRAM 2 generates a television signal according to the memory contents, the signal containing this 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 steering wheel via the transmission path 250. The vehicle speed is received and demodulated by the tuner TU2 on the operation board, and the vehicle speed is displayed on the monitor TV TV2. If the vehicle speed display code is “0” in the process of S318,
Proceeding to S322, the memory contents of VRAM2 are cleared. This clears the display on TV2.

S323 Check fuel display code. When this code is "1", a fuel display operation is performed.

That is, first, proceed to S324, instruct the analog-to-digital converter ADC to convert (signal output to P14), and when the conversion is completed (check P15), convert the converted data to P10.
~Read from P13. The conversion data is converted into numerical data, and the data is written in a predetermined memory of the video ram VRAM in S325 according to the result. VRAM1 is VRA
Similarly to M2, the memory contents are sequentially read out, a television image signal corresponding to the contents is generated, and this is applied to the modulator 210.

The high frequency modulation signal output from the modulator 210 is output to the transmission line 250 through the mixer 230, and this signal is received and demodulated by the tuner TU1 on the steering operation board and applied to the monitor TV TV1. If the fuel display code is "0" in S323, the memory of VRAM1 is cleared and the display on TV1 is turned off.

As described above, according to the present invention, the steering operation board and the on-vehicle control device can be connected using at least one transmission line, so the configuration of the connection mechanism is simple, and the output terminal of the digital modulator can be connected to the on-vehicle control device. Since the system is equipped with a signal delay means, the audio signal from the microphone on the steering operation board can be faithfully transmitted without being affected by the digital signal.

[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;
Figure 2b is a perspective view showing the steering wheel in Figure 2a, Figure 2c is a side view showing the mounting structure of the steering link wheel part in Figure 2a, and Figures 2d and 2e are the brush BA1 and the slip ring, respectively. An enlarged sectional view and an exploded perspective view showing the structure of the installation of SA1, etc. 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 CPU1 in FIG. 1, FIGS. 9a, 9b, and 9c are flowcharts showing the operation of the microcomputer CPU2 in FIG. FIG. 1 is a flowchart showing the data transmission (sending) operation of the microcomputer CPU1, FIG. 10b is a flowchart showing the data reception operation of the microcomputer CPU2, and FIG. 11 is a flowchart showing the operation of the microcomputer CPU3. 1: Driver seat TEL: Telephone 3: Steering wheel 4: Steering operation board 5: Operation panel 38.41: Support 39.42: Gear 40: Steering shaft 43: Connection member 44: Print board 51: Insulator plate 52.53 : Shield plate 54: Resin collar 70.120: Constant voltage power supply 80: Microcomputer 90: Key inch (switch means) 95: FM modulation circuit (analog modulation means) 100: FS
K modulation circuit (digital modulation means) 110: FSK demodulation circuit 130: microcomputer (communication control device) 150
:FSK modulation circuit 160:FSK demodulation circuit (digital demodulation means) 170:
FM demodulation circuit (analog demodulation means) 180: Branch connection circuits 210, 220: Modulators (second modulation means) TV1, T
V2: CRT display (surface display means) TU1, TU2
: Tuner (first demodulation means) VRAM1, VRAM2
: Video ram (display signal generation means) TVC: Television camera (display signal generation means) MC1, MC2: Microphones SA1, SA2: Slip rings BA1, BA2: Brush L1, L2: Electric coil TRX
: Mobile device (communication means) C1, C3: Capacitor (AC coupling means) C2, C4:
Capacitor (signal delay means) DFA: Differential amplifier SP
:Speaker patent applicant Aisin Seiki Co., Ltd. and 1 other representative Patent attorney Nobuaki Sugi Figure 2a East Figure 2b Figure 5 FMM'l, VMA-
-3C real power FMD's □-- Woweeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-- F in out procedure amendments (methods) for figure 6 and wealth figure 7. Waken-dono 1, Incident Indication Patent Application No. 34265 of 1982 2,
Name of the invention Steering operation board signal transmission device 3, relationship to the amended person case Patent applicant address 2-1 Asahicho, Kariya City, Aichi Prefecture Name (001) Aisin Seiki Co., Ltd. Makoto 19 Representative
Chugai Okibi 4, agent address: 103 Telephone number: 03-864-6052
Address: 2-27-6-5 Higashi Nihonbashi, Chuo-ku, Tokyo Date of amendment order 7 Contents of the amendment Engraving of drawings (all drawings) (no changes to the contents) 8 Inventory drawing of attached documents...1 Pass = 192

Claims (5)

[Claims] (1) At least one acoustic-to-electrical conversion means, an analog modulation means for modulating a signal from the acoustic-to-electrical conversion means, a switch means, and a switch device installed on or near the steering wheel. digital modulation means that modulates the signal and outputs a pulse signal with a frequency different from the output of the analog modulation means; a signal delay means connected to the output end of the digital modulation means; and a signal delay means connected between the output end of the digital modulation means and the transmission line. Steering operation board equipped with AC coupling means; equipped on the vehicle body; analog demodulation means for demodulating the signal modulated by the analog modulation means; digital demodulation means for demodulating the signal modulated by the digital modulation means; modulated by an audio signal. an on-vehicle control device comprising: a communication means for emitting electromagnetic waves; and a communication control device for controlling the communication means in accordance with an output signal of the digital demodulation means; and at least one electrical connection means consisting of a slip ring and a brush. A steering operation board signal transmission device, comprising: a transmission means for connecting a steering operation board and an on-vehicle control device. (2) The steering operation board signal according to claim (1), wherein the signal delay means is a capacitor connected between the output end of the digital modulation means and the ground end, and the AC coupling means is a capacitor. Transmission device. (3) The digital modulation means is an FSK modulator. A steering operation board signal transmission device according to claim (1). (4) The steering operation board signal transmission device according to claim (1), wherein the analog modulation means is an FM modulator. (5) Claims (1) and (2) above, wherein the transmission means is connected to the power line of the steering operation board and the power line of the on-vehicle control device through respective AC blocking electric coils. The steering operation board signal transmission device according to item (3) or item (4).