JPS6363417B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a system in which a code corresponding to the operation of an input key switch is installed in the center of the steering wheel from an operation board mounted above the wheel. This invention relates to a device for transmitting information to an on-vehicle fixed control unit on the battery side.

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

However, because the steering mechanism that transmits wheel rotation to the steering shaft is complex,
It is difficult to wire the signal cable that connects the operation board (steering operation board) installed in the center of the steering wheel and the fixed control unit installed on the power line side of the on-board battery. Furthermore, it is necessary to arrange a pipe for wiring and/or a slip ring for connection on the mechanism in a manner that does not interfere with the operation of the steering mechanism.

(Problems to be Solved by the Invention) However, since the space allotted to the steering mechanism is limited, wiring these is quite difficult. In particular, when there are many key switches for inputting key commands for inputting various commands, fixed controls are installed on the power line side of the on-board battery to control various on-board devices in response to key switch inputs. The number of signal lines connecting the units and key switches increases, making wiring difficult.

SUMMARY OF THE INVENTION An object of the present invention is to accurately transmit operation information of various key switches on a steering wheel operation board to a fixed control unit, and to simplify the structure of the steering wheel section for this purpose as much as possible.

[Structure of the invention]

(Means for Solving the Problems) A transmission device of the present invention that achieves the above object includes: an electric coil on the operation board side that is connected to the transmission line of the steering operation board and revolves around the axis of the steering shaft; Input key switch included in
A transmission control device provided on the steering operation board that serially transmits the bit information of the transmission frame in time series; A transmission control device provided on the steering operation board that modulates the bit information sent by the transmission control device and sends it to the transmission line. a modulation circuit; applying an operating voltage to the transmission control device and the modulation circuit;
A constant voltage power supply circuit provided on the steering operation board; A fixed electric coil that revolves around the axis of the steering shaft; demodulates the modulated wave that arrives at the fixed electric coil and reproduces a code corresponding to the switch operation. , a demodulation circuit and a reception control device provided on the power line side of the on-board battery; and
The present invention includes a slip ring that connects a constant voltage power supply circuit of a steering operation board to a power line of an on-board battery, and a brush that contacts the slip ring.

(Function) The slip ring and the brush in contact with the slip ring connect the constant voltage power supply circuit of the steering operation board to the power line of the onboard battery, so that the voltage of the power line of the onboard battery is connected to the constant voltage power supply of the operation board. In addition to the circuit, a constant voltage power supply circuit provides operating voltage to the transmission control device and modulation circuit of the operating board. That is, the operation board is supplied with electric power from a battery, which is an on-board power source, through a slip ring and a brush. Therefore, on the operation board, electrical circuit elements that require operating power can be mounted, and required information can be freely transmitted.

In the operation board, the transmission control device generates a transmission frame containing a code corresponding to the operation of the input key switch and serially transmits the bit information, and the modulation circuit modulates this and sends it through the transmission line. and sends it to the electric coil on the operation board side. This modulated signal is propagated from the electric coil on the operation board side to the electric coil on the fixed side, the demodulation circuit connected to the electric coil on the fixed side reproduces the original bit information, and the reception control device on the fixed side uses this bit information to control the input key switch. Play the code corresponding to the operation.

In this way, the operation board forms a code indicating the operation of the input key switch and a transmission frame containing it and sends it to the fixed-side reception control device, and the fixed-side demodulation circuit and reception control device respond to the input key switch operation. Play the corresponding code. That is, on the operation board, since the operation information of the input key switch is formed into the transmission frame by digital processing, many types of operation information can be set. That is, the number of input key switches can be increased and the amount of information to be transmitted can be increased. Communication between the operation board and the reception control device, which is a fixed unit, is serial transmission and reception of bit information constituting the transmission frame, so only one communication line is required. However, if this communication line is
Since it is composed of a pair of electric coils and there is no mechanical connection between the coils, the structure of the steering wheel section does not become complicated or bulky.
The transmission and reception of the transmission frame is digitally processed, and the bit information is either H or L, and the reliability of bit information reproduction is extremely high, so that the reception and reproduction in the reception control device is accurate.

That is, according to the transmission device of the present invention, a large amount of information can be accurately transmitted from the operation board to the fixed control device without making the structure of the steering wheel portion excessively complicated.

In order to confirm the reception process and control the status display on the steering wheel operation board, it is preferable that the on-vehicle fixed control unit transmits a code indicating reception, status display instructions, etc. to the steering wheel operation board. Therefore, in a preferred embodiment of the present invention, a demodulation circuit is provided on the steering wheel operation board, and display means such as lamps, light emitting diodes, character displays, two-dimensional graphic displays, etc. and/or speakers, etc. are provided as necessary. Furthermore, the transmission control device of the operation board shall decode or reproduce the received notification code and/or notification instruction code or notification data from the fixed control unit to decode the transmission/reception and activate the notification. The fixed control unit is provided with a modulation circuit, and the reception control device of the fixed control unit controls reception notification and transmission of status notification codes or data as necessary. Thereby, transmission and reception of electrical signals, notification, and device control can be performed using a relatively low-power modulation and demodulation circuit in the same way as data transmission and reception processing between normal telecommunication terminals.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 shows an outline of the configuration of an embodiment of the present invention.
In this example, the steering wheel operation board includes a constant voltage power supply 70, a microcomputer unit 80 which is a transmission control device, a key switch 90, an FSK modulation circuit 100, and an FSK demodulation circuit 11.
0 and a coil STL1 for transmission and reception.

The fixed control unit on the on-board battery side includes a constant voltage power supply circuit 120, a microcomputer unit 130 which is a reception control device, and an FSK modulation circuit 1.
50, an FSK demodulation circuit 160 and a transmitting/receiving coil STL2, and various devices 140 are connected to the microcomputer unit 130.

The constant voltage power supply circuit 120 and the fixed side slip ring 45 are directly connected to the power line VPL of the on-board battery, and the output end of the FSK modulation circuit 150 and the input end of the FSK demodulation circuit 160 are connected to the coil.
Connected to STL2. slip ring 45
The brush 48a contacts the brush 48a, and another brush 48b connected to the brush 48a contacts the operation board side fixed slip ring 46. As will be described later, the slip rings 45 and 46 are stationary;
As the wheel rotates, the brushes 48a, 48b rotate. Coil STL1 has FSK modulation circuit 10
The output terminal of FSK demodulation circuit 110 is connected to the output terminal of FSK demodulation circuit 110. A power line SPL on the operation board side is connected to a constant voltage power supply 70. The operation board side power line SPL and the fixed control unit side power line VPL are connected to each other via slip rings 45, 46 and brushes 48a, 48b, and serve as power supply lines to the operation board.

FIG. 2a shows an external perspective view of the steering wheel, and FIG. 2b shows a front view. In FIGS. 2a and 2b, 30 is a steering wheel (handle), and an operation panel 31 of the attitude control device is installed in the center of the steering wheel. Three switches 32a, 33a and 34a arranged on the right side of the steering wheel 30 are for controlling the tilt angle of the steering wheel 30, 32a is an up switch that corrects the vertical angle upward, and 33a is an up switch that corrects downward. The down switch 34a is an away switch that specifies the upper and lower corners as the upper limit retracted (tilt away) position and returns the upper retracted position to the original operating position.

Three switches 32b, 33b and 34b located on the left side of the steering wheel 30
is for controlling the wheel height, and 32b is an away switch that instructs to drive the wheel to the upper limit retracted position, and also instructs to drive the wheel to the operating position when the wheel is at the upper limit retracted position. 33b is a switch for raising instructions, and 34b is a switch for lowering instructions.

FIG. 2c is a side view of the operating section 35 of the steering mechanism. The operation section 35 is roughly composed of a steering wheel 30, an operation panel 31, a steering telescope mechanism 36, and a tilt mechanism 37.

FIG. 2d is a sectional view showing a support structure for the steering wheel 30 and the operation panel 31. The support 38 and the gear 39 are fixed to the body of the vehicle, and the steering main shaft 40 is rotatably supported by the support 38. The support 41 is connected to the steering wheel 30 and the steering main shaft 40, and rotatably supports the gears 39, 42 and the connecting member 43. The connecting member 43 has gears 43a and 43b having the same number of teeth, which are connected to the gears 39 and 42, respectively, at both ends thereof.

A printed circuit board 44 including an attitude control circuit and an operation panel 31 are fixed to a gear 42 . 45 and 46 are slip rings fixed to the support 38 and the operation panel 31, respectively, and brushes 48a and 48b are pressed onto both by compression coil springs 47a and 47b, so that the two are electrically connected. It's summery. Note that the gears 39 and 42 have the same number of teeth. The purpose of this structure is to prevent the operation panel 31 from rotating as the steering wheel 30 rotates. In this embodiment, when the steering wheel 30 is rotated, the support 41 and the steering wheel are rotated. The main shaft 40 rotates to perform a steering operation, but since the gears 43a, 43b and 39, 42 have the same number of teeth, the support 41 is generated by the circular movement of the connecting member 43 due to the rotation of the support 41. and the relative movement amount (angle) of the gear 39, and the support 41 and the gear 42
The relative movement amounts of the gears 42 and 39 become equal, and the gear 42 and the gear 39
As a result, even if the steering wheel 30 rotates, the operation panel 31 does not rotate.

Power is supplied to the printed circuit board 44 through slip rings 45, 46 and brushes 48a, 48b.
It is done through. An electric coil STL2 is fixed to a support plate 39a fixed to the gear 39,
A coil STL1 is fixed inside the operation panel 31 so as to face the coil STL2.

Figure 2e shows the steering telescope mechanism 3.
Figure 2f is an enlarged cross-sectional view of the drive unit of No. 6, and its f-
It is an f-line sectional view. The steering telescope mechanism 36 moves the steering wheel 30 forward and backward relative to the driver, and in this embodiment is driven by a motor M7. The main shaft 40 and the shaft 40a do not slip in the direction of rotation, but are fitted to be slidable in the direction of arrow A.
The guide member 50 on the fixed side is provided with a drive section including a motor M7, which drives a threaded rod 52 fixed to the bracket 51 on the movable side. A shaft 53 of motor M7 is coupled to a worm shaft 54. The nut 55 that meshes with the worm gear 54a formed on the worm shaft 54 is screwed into the threaded rod 52 and is fixed in position and rotatable, so that the motor M
7 rotates, the worm gear 54a rotates, rotates the nut 55, and moves the threaded rod 52 forward (or backward) in the direction of arrow A. As a result, the movable side such as the steering wheel 30 is guided by the guide member 50 and moves back and forth in the axial direction of the main shaft 40, that is, in the direction of arrow A. This moves the steering wheel 30 up and down. Note that 60a and 60b are limit switches that detect the lower limit and upper limit positions.

The shaft 40b is fixed in position, and the shaft 40b is fixed in position.
0a is connected to the shaft 40b by a universal joint 56, so that the vertical angle can be changed in the direction of arrow B. Reference numeral 57 denotes an arm having one end connected to a position shifted downward from the position of the universal joint 56, which serves as a fulcrum for changing the vertical angle, and the other end connected to a nut 58 on the drive side. Natsuto 58
is a threaded rod 59 rotationally driven by motor M6.
are screwed together. Therefore, when the motor M6 rotates, the threaded rod 59 rotates, but the nut 58 does not rotate, which causes the nut 58 to move in the axial direction (arrow A
direction) to drive the arm 57, and the movable side rotates around the universal joint 56. Note that 60c and 60d are limit switches that detect the upper limit position on the movable side.

FIG. 3a shows the configuration of the operation board fixed to the operation panel 31. In this case, the key switch 90 shown in FIG. 1 is a key input unit 9 which is a combination of a momentary key switch and a key encoder that is closed only while the key is being pressed as shown in FIG. 3a.
1. Operation switch input sections 92 and 93 consisting of an operation switch that closes when pressed once and opens when pressed the next time, and a flip-flop for latching the state.
It consists of

The FSK modulation circuit 100 includes a pulse oscillator 101,
FSK modulator 102, output cutoff gate 10
3 and a transmission driver 104,
The FSK demodulation circuit 110 is an amplification/waveform shaping circuit 1
11, a noise cutoff circuit 112 and an FSK demodulator 113. The microcomputer unit 80 is a one-chip microcomputer.
It consists of a CPU, address latch ADL, semiconductor read-only memory ROM, input/output port I/O, reset switch, and clock pulse oscillator.The ROM stores key input reading program data and transmits codes according to changes in key status. Transmission control program data to be created and transmitted is stored.

Figure 3b shows the construction of the fixed control unit.
This fixed control unit is also similar to the operating board.
FSK modulation circuit 150 (pulse oscillator 151,
FSK modulator 152, output gate 153 and transmission driver 154) and FSK demodulation circuit (amplification/waveform shaping circuit 161, noise cutoff circuit 162)
and an FSK demodulator 163).

In this embodiment, a constant speed control device, an air conditioner, and a radio are connected to the microcomputer unit 130 in a relay control mode. In addition to the FSK transmission/reception control program data, the ROM of the unit 130 stores control program data for decoding received codes and controlling energization of relays L1 to L6.

FSK modulation circuits 100, 150 and FSK demodulation circuits 110, 1 shown in FIGS. 3a and 3b.
60 input/output signals are shown in FIG. The operations of the FSK modulation circuit 100 (150 operates in the same manner) and the FSK demodulation circuit 110 (160 operates in the same manner) will be described with reference to FIG.

First, the output port P2 of the 1-chip microcomputer CPU of the unit 80 on the operation board 31
4 becomes a high level H, the pulse oscillator 101 is activated and generates a constant frequency pulse B. In this state, if the output P25 is at a high level H, the modulator 102
Output C becomes a pulse synchronized with pulse B, and when output P25 is low level L, output C becomes pulse B
It becomes a 1/2 frequency divided pulse. Therefore, while P25 is at H level, output C becomes pulse B, and while P25 is at L level, it becomes a 1/2 frequency divided pulse of pulse B. This output C is amplified by the driver 104 and sent to the operation board side electric coil STL1.

Since a coupling capacitor is inserted between the transmission driver 104 and the electric coil STL1, the signal line connected to the electric coil STL1 has a positive peak at the rising point of the bipolar pulse D, that is, the pulse C. A differential pulse with a negative peak appears at the falling point. When a hyperbolic pulse D appears on the signal line connected to the electric coil STL1, it is amplified by the amplification/waveform shaping circuit 111 via a coupling capacitor, shaped into a positive polarity pulse E, and applied to the noise cutoff circuit 112. There, it is further shaped to a desired width to widen the high level H width (F), integrated in the demodulation circuit 113 and converted to analog (H), and further binarized to produce two high level H or low level L. The value signal (I) becomes
Applied to input terminal T ₀ .

Unit 80's microcomputer CPU is
When the transmission bit is H, the output port P25 is set to H for the time T, and L for the next T, and this period 2
When T is assigned to 1 bit and the transmitted bit is L, the output P25 is set to H for the time 1/2T, and the output P25 becomes H for the next 1/2T.
During reception, one period T is assigned to 1 bit, and when receiving, if the input terminal _T0 is H during T, it is read as 1 bit H has arrived, and when it is H during 1/2T. This is read as the arrival of 1 bit L.
The same applies to the microcomputer CPU of unit 130 for transmitting and receiving signal processing or decoding.

In this embodiment, the frame structure of the transmitted signal is as shown in Fig. 4a, consisting of a 10-bit H mark code indicating the beginning of the frame, a 1-bit L indicating the start of data, 16-bit data, and an 8-bit mark code.
The data bits are further divided into two 8-bit sections A and B, and the A group contains horn energization instruction and radio control data (key switch status notification) as shown in Figure 4b. As shown in FIG. 4c, constant speed running control and air conditioner control data (key switch status notification bit) are assigned to group B.

FIG. 6a shows the transmission/reception control flow of the microcomputer unit 80 (FIG. 3a) of the operation board 31. Transmission and reception control of the unit 80 will be explained with reference to this. The voltage of the on-board battery is applied to the constant voltage power supply 70, and the constant voltage power supply 70 applies a predetermined voltage to each part of the electric circuit of the operation board 31. When the power is turned on to the CPU of the unit 80, the corresponding The CPU initializes the input reading registers and input/output ports, monitors the input ports of the I/O and its own input ports P13-P10, and detects a state change in any of them indicating a key closure or switch closure. Each bit of the /O input port and input ports P13 to P10 is set in the input read register, the contents thereof are converted to transmission data (data A plus data B), and CRC check bits BCC of the transmission data are created. And a counter for checking transmission/reception errors (program counter)
A predetermined value is set in the output port P24, H is set in the output port P25, and a 2T period (when the bit = H) or a T period ( When bit = L) pulse is set to 1 for 1 bit.
Output by period assignment.

This allows electric coils STL1 and STL2 to
FSK demodulation circuit 1 of the fixed control unit via
At 60, a bipolar pulse D corresponding to the serial bit arrangement of the transmitted frame (Fig. 4a) arrives, which is demodulated and similar to the pulse sent to the output port P25 of the CPU of the operating board (Fig. 3a). The fixed control unit CPU (Figure 3b)
is applied to the input port T ₀ of .

When the CPU of the operation board (FIG. 3a) finishes transmitting one frame (FIG. 4a), it turns on the timer (program timer) and outputs a 1/2 period pulse indicating L to the output port P25. When a timeout occurs, both output ports P24 and P25 go low.
Then, turn on the timer and wait for the _T0 terminal to become H.

If the _T0 terminal becomes H before this timer times out, the H time is counted and the H bit or L
Determine if it is a bit, store it in the reception register, increment the bit count register by 1,
This is repeated every time _T0 changes from L to H, and when the count register reaches 19, the contents of the 12th to 19th bits of the receive register (ACK)
If all of them are L (reception complete), P24 is set to H again, and a pulse corresponding to a frame of mark (10 bits), start 1 bit, and continuous H ACK 8 bits is output to P25, and then After the predetermined time P25 is set to L, P24 is set to L. Thereafter, the input terminal _T0 is monitored for a predetermined period of time, and if it becomes H during that time, the data is written to the reception register in the same manner as described above, the limit counter is decremented by 1, the data is read, and the data is 8 bits L.
ACK (ACK is a reply code, consisting of 8 bits, all bits L = 0 indicates completion of reception, all bits H = 0)
=1 indicates completion of transmission), it is considered that reception is complete.

If the input terminal _T0 does not become H for a predetermined time after reception completion (ACK=L×8 bits) is received, the CPU of the operation board (FIG. 3a) returns to key input reading. If reception completion (ACK=L×8 bits) is not sent within a predetermined time after transmitting the data frame (FIG. 4a), the limit counter is decremented by 1 and the data frame is transmitted again. When the content of the limit counter becomes zero, it is regarded as an abnormality, the warning light on the operation board is set to turn on, and the process returns to key input reading. After receiving the ACK (=L x 8 bits) frame indicating reception completion, when the input terminal _T0 becomes H, data is read and the limit counter is set to 1.
When the data is decremented and the data is ACK=L×8 bits, transmission completion ACK=H×8 bits is sent out again, and when the data is not ACK=L×8 bits, the limit counter is further decremented by 1. Reception completed
If the limit counter reaches zero after receiving ACK "0", set the alarm display and return to key input reading.

In key input reading, the status signal of the input port is read at predetermined intervals and compared with the memory bit of the input register, and if any input has changed from the memory bit of the input register, it is assumed that a key or switch input has been made. , writes the input status signal to the input register and performs the above-mentioned transmission and reception.

FIG. 6b shows the reception/transmission control flow of the microcomputer CPU (FIG. 3b) of the fixed control unit. This is similar to the reception/transmission control flow of the operation board CPU (Figure 3a), but the received data (4th
A CRC check bit is generated from the data bits in Fig. 4a) and compared with the received BCC to check for transmission/reception errors. The difference is that a reception completion frame converted into ") is sent out, and the received data is converted into a device control code and set to the output port to the device 140."

In addition, other display means, notification means, small equipment, etc. are connected to the microcomputer unit 80 of the operation board 31, and the unit 1
By connecting a key switch to 30 and storing a program capable of executing both the control flows of FIGS. 6a and 6b in both the CPUs of units 80 and 130, two-way remote instructions,
Control is possible.

Furthermore, the transmission/reception data frame can have not only the configuration shown in FIG. 4a but also any other desired configuration, such as a variable number of bits containing a data number code, as shown in FIG. 7, for example.

In addition, in the above embodiment, the transmission data is
Although FSK modulation and demodulation are used, other modulation and demodulation used for data communication may also be used.

〔Effect of the invention〕

As described above, according to the present invention, the slip ring 4
5, 46 and the brushes 48a, 48b in contact with the slip rings 45, 46 connect the constant voltage power supply circuit 70 of the steering operation board 31 to the power line VPL of the on-board battery. The voltage is applied to the constant voltage power supply circuit 70 of the operation board 31, and the constant voltage power supply circuit 7
0 provides an operating voltage to the transmission control device 80 and modulation circuit 100 of the operation board 31. That is, the operation board 31 includes a slip ring 45,
46 and brushes 48a and 48b are supplied with electric power from a battery, which is an on-vehicle power source. Therefore, the operation board 31 can be equipped with electrical circuit elements 80 and 100 that require operating power, and can freely transmit required information.

In the operation board 31, the transmission control device 80 generates a transmission frame (FIG. 4a) containing a code corresponding to the operation of the input key switch, and serially sends out the bit information. is modulated and sent to the operation board side electric coil STL1 via the transmission line. This modulated signal is sent to the electric coil STL1 on the operation board side.
The demodulation circuit 160 is propagated from the stationary side electric coil STL2 to the stationary side electric coil STL2, and is connected to the stationary side electric coil STL2.
reproduces the original bit information, and the fixed-side reception control device 130 reproduces a code corresponding to the input key switch operation from this bit information.

In this way, the operation board 31 forms a transmission frame (FIG. 4a) containing a code indicating the operation of the input key switch 90, and transmits it to the reception control device 130 on the fixed side. Controller 130 plays a code corresponding to the input key switch operation. That is, on the operation board, since the operation information of the input key switch 90 is formed into the transmission frame (FIG. 4a) by digital processing, many types of operation information can be set. That is, the number of input key switches 90 can be increased, and the amount of information to be transmitted can also be increased. Communication between the operation board 31 and the reception control device 130, which is a fixed unit, is serial transmission and reception of bit information constituting a transmission frame (FIG. 4a), so only one communication line is required. However, since this communication line is composed of a pair of electric coils STL1 and STL2, and there is no mechanical connection between the coils, the structure of the steering wheel section does not become complicated or bulky. Transmission and reception of the transmission frame (FIG. 4a) is performed by digital processing, and the bit information thereof is either H or L, and the reliability of reproduction of the bit information is extremely high, so that the reception and reproduction in the reception control device 130 is accurate.

That is, according to the transmission device of the present invention, the control device 130 on the fixed side of the operation board 31 can be moved without making the structure of the steering wheel part excessively complicated.
A lot of information can be transmitted accurately.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a general configuration of an embodiment of the present invention, Fig. 2a is a perspective view showing the external appearance of a steering wheel operation board in an embodiment of the invention, Fig. 2b is a plan view, and Fig. 2c is 2D is a longitudinal sectional view of the steering system section, FIG. 2D is a longitudinal sectional view of the operation board mounting section, FIG. 2E is an enlarged sectional view of the wheel vertical drive mechanism, and FIG.
Fig. 3a is a block diagram showing the details of the structure of the steering wheel operation board; Fig. 3b is a cross-sectional view taken along line f;
The figure is a block diagram showing the details of the configuration of the on-board battery side fixed control unit, FIG. 4a is a plan view showing the configuration of the transmission signal frame, FIGS. The diagram is FSK
3 is a time chart showing input and output signals of a modulation circuit and a demodulation circuit. FIG. 6a is a flowchart showing the transmission/reception control operation of the microcomputer unit 80 shown in FIG. 3a, and FIG. 6b is a flowchart showing the transmission/reception control operation of the microcomputer unit 130 shown in FIG. 3b. FIG. 7 is a plan view showing another structure of the transmitted and received data frame. 30: Steering wheel, 31: Operation panel (steering operation board), 32: Up switch, 33: Down switch, 34: Away switch, 35: Operation part of steering mechanism, 3
6: Telescope mechanism, 37: Tilt mechanism, 3
8, 41: Support, 39, 42: Gear, 40:
Main shaft, 43: Connection member, 44: Printed circuit board, 50: Guide member, 45, 46: Slip ring, 48a, 48b:
Brush (brush), 51...Bracket, 52: Threaded rod,
53: Motor shaft, 54: Worm shaft, 55,5
8: Natsuto, 56: Universal joint, 5
7: Arm, 60: Limit switch, 80: Microcomputer unit (transmission control device),
100: FSK modulation circuit (modulation circuit), 90: key switch (input key switch), 130: microcomputer unit (reception control device), 16
0: FSK demodulation circuit (demodulation circuit), STL1: Electric coil (operation board side electric coil), STL2: Electric coil (fixed side electric coil).

Claims (1)

[Claims] 1. An electric coil on the operation board side connected to the transmission line of the steering operation board and orbiting around the axis of the steering shaft; An input key switch provided on the steering operation board; A code corresponding to the operation of the input key switch. a transmission control device included in the steering operation board, which generates a transmission frame including the transmission frame and serially transmits the bit information of the transmission frame in time series; A modulation circuit installed on the steering operation board that sends out voltage to the transmission control device; A constant voltage power supply circuit installed on the steering operation board that applies operating voltage to the transmission control device and the modulation circuit; Circulating around the axis of the steering shaft Fixed side electric coil; Demodulates the modulated wave arriving at the fixed side electric coil and reproduces a code corresponding to the switch operation.
A demodulation circuit and a reception control device provided on the power line side of the on-board battery; and a slip ring that connects the constant voltage power supply circuit of the steering operation board to the power line of the on-board battery, and a brush that contacts the slip ring; A steering control board power and signal transmission device comprising: