JP3429970B2 - Signal transmission equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission device for transmitting control signals between a vehicle body and a slide door.

[0002]

2. Description of the Related Art In a vehicle equipped with a sliding door such as an automobile that has been conventionally used, FIG. 17 shows the power supply from the vehicle body to the sliding door and the operation of the electrical equipment in the sliding door from the vehicle body side. This has been done through the connection connector 501 of the type in which the contacts shown in the drawing directly contact each other.

The connection connector 501a on the vehicle body side and the connection connector 501b on the sliding door side are arranged so that their contacts come into contact with each other when the sliding door is in a half-door state where the sliding door is not completely closed. When,
The power supply for driving the automatic door closure 502 can be received from the body of the vehicle body.

In addition to the automatic door closure 502, electrical components such as a power window 503 and an electromagnetic door lock 504 are installed in the slide door. The connection connector 501 has individual contacts for each electrical component, and the operation and power feeding are individually performed from the vehicle body side through the contacts corresponding to each electrical component.

Further, Japanese Patent Laid-Open No. 14920/1990 discloses that
A signal transmission device for transmitting various control signals between a slide door and a vehicle body side using infrared rays is disclosed.

In this apparatus, an infrared light emitting element is provided on the slide door side, and an infrared light receiving element is provided on the vehicle body side, and the directivity ranges of the light emitting element and the light receiving element are adjusted to each other, so that the slide door is adjusted. Infrared communication is possible even when the is open.

[0007]

In the conventional signal transmission device in which operation and power feeding from the body of the vehicle body are performed through individual contacts provided for each electrical component, the number of contacts required as the number of electrical components in the sliding door increases. However, there is a problem that the size of the connection connector is increased. In addition, due to the positional displacement between the contacts, the electrical connection may become unstable, or an oxide film may be formed on the contact, and in particular, the electrical connection may not be surely made at a minute current.

On the other hand, in the case where infrared rays are used for communication of control signals between the slide door and the vehicle body,
When the surface of the light emitting element or the light receiving element becomes dirty, there is a problem that proper communication cannot be secured. In particular, when the slide door is open, such as when a person gets on and off, dirt easily attaches to the surface of the light receiving element and the like, which makes it difficult to secure stable communication.

Further, when bidirectional communication is performed between the slide door and the vehicle body, a light emitting element and a light receiving element must be provided on the slide door side and the vehicle body side, respectively.
There has been a problem that the cost of the device rises, the size of the connection connector portion is increased, and the possibility that dirt is attached increases, so that the stability of communication is impaired accordingly.

The present invention has been made by paying attention to the problems of the prior art as described above. It is possible to ensure stable transmission of control signals between the slide door portion and the vehicle body portion, and It is an object of the present invention to provide a signal transmission device that can perform bidirectional communication with a transmission / reception element.

[0011]

The gist of the present invention for achieving the above object resides in the inventions of the following items. [1] In a signal transmission device (10) for transmitting a control signal between a vehicle body portion and a slide door portion, the vehicle body portion and the vehicle body portion are close to each other within a predetermined distance when the slide door portion is closed. Coil elements (24, 28, 201) are provided on the slide door portion, respectively, and a coil element (28, 201b) provided on the slide door portion and a coil element (24, 201a) provided on the vehicle body portion are provided. A transmission circuit for transmitting the control signal between the slide door portion and the vehicle body portion using an electromagnetic induction phenomenon occurring between them and applying a control signal to be transmitted to the other party to the coil element (201) ( 214) and the coil element (20
A receiving circuit (240) for reproducing a control signal sent by the other party based on the electromotive force generated in (1), and the transmitting circuit (2)
14) and a transmission / reception switching circuit (212, 216, 244) for selectively switching which of the receiving circuit (240) is connected to the coil element (201), and the same coil element is provided. (201) is used for both transmission and reception of the control signal, and bidirectional communication is performed between the vehicle body part and the slide door part.
With the coil element (201) connected to the receiving circuit (240), the ground potential side output terminal (201d) and the non-ground potential side output terminal (2) of the transmitter circuit (214).
01c), the coil element (201) and the switch element (212) are arranged in series so that the switch element (212) is located closer to the output terminal (201c) on the non-ground potential side, Which signal of the dummy signal of a predetermined potential and the output signal of the receiving circuit (240) which is recognized as false by the digital circuit to which the output signal of the receiving circuit (240) is input is input to the digital circuit. Signal switching means (212, 216,
244) and when the coil element (201) is used for transmission, the switch element (212) is turned on and the non-ground potential side output terminal (201c) of the transmission circuit (214) and the coil element. (201) and the signal switching means (2) so that the dummy signal is selected as an input signal to the digital circuit while being electrically connected.
12, 216, 244), and the coil element (2
01) for receiving, the switching element (21
2) is turned off and the output terminal (201c) on the non-ground potential side of the transmission circuit (214) and the coil element (20).
1), and the signal switching means (244) is set so that the output signal of the receiving circuit (246) is selected as an input signal to the digital circuit. ).

[0012]

[0013]

[2] The signal transmission device according to [1], wherein the control signal is a digital signal composed of a plurality of bits, and the signal is serially transmitted between the vehicle body and the slide door. (10).

[3] The coil element (24, 28, 201b) on the side of the sliding door and the coil element (24, 28, 201a) on the side of the body of the vehicle body are completely closed at the sliding door. The signal transmission device (10) according to [1] or [2], wherein the signal transmission devices (10) are arranged such that they are close to a distance at which the control signal can be transmitted by an electromagnetic induction phenomenon in the absence of a half-door.

The present invention operates as follows. Coil elements (24, 2) are attached to the slide door and the vehicle body, respectively.
No. 8, 201) is provided, and when the slide door is closed, the coil elements (24, 28, 201) are close to each other within a predetermined distance or less.
Place 1). For example, when a control signal is transmitted from the slide door part side to the vehicle body part side, a current corresponding to the control signal is applied to the slide door side coil element (28a, 201b), and the slide door side coil element (28a, 20b) is supplied.
1b) Change the magnetic flux around.

Coil elements (24b, 20) on the body side of the vehicle body
1a) is close to the coil elements (28a, 201b) on the slide door portion side when the slide door portion is closed, the coil element (28a, 2b) of the slide door portion
The electromotive force is generated in response to the change in the magnetic flux from 01a). By detecting this electromotive force, the control signal transmitted from the slide door side is reproduced on the vehicle body side.

The electromagnetic induction phenomenon is caused by the coil elements (24, 2,
(8, 201) is not easily affected by dirt such as mud adhering to the surface of the body, it is possible to secure a stable transmission state even in a place where dirt is likely to occur, such as between the sliding door section and the vehicle body section. it can.

Further, a transmission circuit (214) for applying a control signal to be transmitted to the other party to the coil element (201).
And a receiving circuit (240) for reproducing the control signal sent by the other party based on the electromotive force generated in the coil element (201).
Which of the circuits is connected to the coil element (201) is selectively switched by the transmission / reception switching circuit (212, 216, 244).

Thus, the same coil element (201) can be used both for transmitting and receiving the control signal, and one set of coil elements (201a, 201b) realizes bidirectional communication between the vehicle body and the slide door. can do.

The switching of the connection of the coil element (201) can be performed as follows. That is, the coil element (201) is always connected to the receiving circuit (240), and the non-ground potential side (high potential side) output terminal (201c) of the transmission circuit (214) and the ground potential side output terminal ( The coil element (201) and the switch element (212) are arranged in series with the switch element (201d) so that the switch element (212) is closer to the output terminal (201c) on the non-ground potential side.

Further, which one of the output signal of the receiving circuit (240) and the dummy signal of a predetermined potential which the digital circuit in the subsequent stage to which the output signal of the receiving circuit (246) is input recognizes as false is selected. A signal switching means (244) for selectively switching whether to input to is provided.

When the coil element (201) is used for transmission, the switch element (212) is turned on and between the non-ground potential side output terminal (201c) of the transmission circuit (214) and the coil element (201). The coil element (2
01) is connected to the transmission circuit. Further, the signal switching means (244) is set so that the input signal to the subsequent digital circuit becomes the dummy signal. This allows the receiving circuit (24
Even when the coil element (201) is still connected to (0), an unnecessary signal is prevented from being input to the circuit in the subsequent stage.

On the other hand, when the coil element (201) is used for reception, the switch element (212) is turned off to connect between the non-ground potential side output terminal (201c) of the transmission circuit and the coil element (201). Open and coil element (201)
A state in which the voltage from the transmission circuit is not applied is formed. Then, the signal switching means (244) is set so that the output signal of the receiving circuit (246) is selected as the input signal to the digital circuit in the subsequent stage, and the received signal is made effective. Here, if the switch element (212) is composed of a transistor, the connection state of the coil element (201) can be easily switched.

Further, the control signal is composed of a digital signal having a plurality of bits, and the signal is serially transmitted between the vehicle body and the slide door. Thereby, the control information composed of a plurality of bits can be transmitted by one set of coil elements (201a, 201b).

In the half-door state where the sliding door is not completely closed, the coil elements (28a, 28b, 201b) on the sliding door side are arranged so that they come close to each other by a distance capable of transmitting a control signal by an electromagnetic induction phenomenon. The coil elements (24a, 24b, 201a) on the vehicle body side are arranged. As a result, it is possible to exchange control signals even in the so-called half-door state. For example, if the fact that the closure has detected the half-latch is transmitted to the body part of the vehicle body, the half-door state can be recognized more accurately on the body part of the vehicle body than when the door switch detects the half-door state.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Reference modes and embodiments of the present invention will be described below with reference to the drawings. 2 to 11 show a reference embodiment of the present invention. As shown in FIG. 2, the signal transmission device 10 is a device that supplies electric power from the body part of the automobile to the slide door part side and exchanges various control signals between the body part and the slide door part. .

Power supply and control signal transmission / reception between the vehicle body and the slide door portion are performed via the connection connector portion 20. A vehicle body side connector 20a is provided on the vehicle body portion, and a door side connector 20b is provided on the slide door portion. The vehicle body side connector 20a and the door side connector 20b are arranged to face each other when the sliding door portion is closed. The connection connector section 20 includes a power supply contact section for supplying power by direct contact, and a coil element section for exchanging control signals by utilizing an electromagnetic induction phenomenon in a non-contact close state.

Power supply contact 2 of the vehicle body side connector 20a
A power supply for supplying power to the slide door portion is connected to 2a, and a power supply contact 22b is grounded. The vehicle body unit is provided with a body-side controller 30 that converts a switch operation on the vehicle body side into code information and transmits the code information to the slide door unit, and receives various signals from the slide door unit. The transmission coil element 24a and the reception coil element 24b of the vehicle body side connector 20a are connected to the body side controller 30, respectively, and the transmission coil element 24a transmits a control signal from the vehicle body section to the slide door section. In addition, the receiving coil element 24b is used to receive the control signal sent from the slide door portion.

Power supply contact 2 of the door side connector 20b
6a, 26b, the receiving coil element 28b, and the transmitting coil element 28a are all connected to a door-side controller 40 that integrally controls the operation of various electrical components in the sliding door section. The sliding door portion is provided with a power window 51, an electromagnetic door lock actuator 53, and a closure 55 as main electrical components inside the door.

The closure 55 is a device for closing the sliding door part in a semi-door state which is not completely closed to a completely closed state. The half switch 57
The handle switch 59 is a switch that detects that the sliding door is closed to the half-door state, and the handle switch 59 is a switch that detects operation of the door opening / closing handle. Each coil element is covered with a weather resistant non-conductive resin so that the coil element on the vehicle body and the coil element on the slide door do not come into direct electrical contact. .

FIG. 3 shows a circuit configuration of the body-side controller 30. Body side controller 30
Is composed of a one-chip type microprocessor 31 and its peripheral circuits. The one-chip microprocessor 31 includes a CPU (central processing unit) 31a, a ROM
In addition to the (read only memory) 31b and the RAM (random access memory) 31c, an input port 31d and an output port 31 that control the interface with peripheral circuits
e and A / D (analog / digital) converter 3
It is equipped with 1g. It also has an interrupt terminal 31f for receiving an event from the outside.

The peripheral circuit connected to the one-chip microprocessor 31 is sent from the other side based on the electromotive force generated in the transmitting circuit 32 for driving the transmitting coil element 24a and the receiving coil element 24b. A receiving circuit 33 for reproducing the control signal is connected. Further, various switches such as an unlock switch of a door, a lock switch, an up switch of a power window, and a down switch are connected via a pull-up circuit 34.

In addition, the one-chip microprocessor 31 is connected to a system clock oscillator circuit 35 for supplying its operation clock, a 5V power supply circuit 36 for supplying a power supply voltage of 5 volts, and a reset circuit 37.

FIG. 4 shows a circuit configuration of the door side controller 40. The door side controller 40 includes a one-chip type microprocessor 41 similar to the body side controller 30 and its peripheral circuits.
The one-chip microprocessor 41 is a CPU 41
a, ROM 41b, RAM 41c, input port 41d,
It has an output port 41e, an A / D converter 41g, and an interrupt terminal 41f.

The one-chip microprocessor 41 is connected to a transmitter circuit 42 for driving the transmitter coil element 28a and a receiver circuit 43 to which the receiver coil element 28b is connected. Further, various switches such as an up switch, a down switch, a half latch switch, and a handle switch for the power window are connected via a pull-up circuit 44.

The relay drive circuit 50 is for controlling a door unlocking and locking actuator 53, a forward / reverse control relay circuit for the power window 51, and a forward / reverse control for the closure 55. It is a circuit portion for driving the relay circuit. The current amplification circuit 45 includes a power window 51 and a closure 5.
5 is a circuit portion for amplifying a current signal for monitoring the operating state of the device 5.

In addition, the one-chip microprocessor 41 includes a system clock oscillation circuit 47 for supplying an operating clock, a 5V power supply circuit 48 for supplying a 5V power supply voltage, a reset circuit 46, and power supplied from the vehicle body. A power supply voltage dividing circuit 49 for monitoring the voltage of is connected.

FIG. 5 shows the circuit configuration of the transmission circuits 32 and 42. A coil element 61 and a switching transistor 62 are connected in series between the power supply and the ground potential. A diode 63 and a capacitor 64 are connected in parallel with the coil element 61.

Depending on whether the voltage applied to the input terminal 65 of the transmission circuit is high level or low level, conduction or non-conduction between the collector and the emitter of the transistor 62 is switched to control the current to the coil element 61. Coil element 61
The magnetic field generated at is changed.

FIG. 6 shows a circuit configuration of the receiving circuits 33 and 43. A change in the magnetic flux from the other coil element causes an electromotive force in the coil element 71 of the receiving circuit, and the voltage is applied to the non-inverting input of the comparator 72. A voltage obtained by dividing the power supply voltage by the resistors 73a and 73b is applied to the inverting input of the comparator 72.

The output signal of the comparator 72 is input to an operational amplifier 74 which functions as a non-inverting amplifier, and the output of the operational amplifier 74 is a transistor 75 whose emitter is grounded.
Has been added to the base of. The collector of the transistor 75 is connected to the power supply via a resistor, and the collector of the transistor 75 is connected to the output terminal 76 of the receiving circuit. Therefore, the transistor 75 acts as an inverting circuit, and the operational amplifier 7 is connected to the output terminal 76 of the receiving circuit.
A voltage waveform (square wave) obtained by inverting the output of 4 appears.

FIG. 7 shows the data structure of the control signal transmitted through the coil element between the vehicle body and the sliding door. One control signal transmitted from the vehicle body portion to the sliding door portion or from the sliding door portion to the vehicle body portion is a start of message (81),
It is composed of 8-bit data (82), parity bit (83) and end of message (84). The signal transmission device 10 is configured to serially transmit the control signal having such a data structure between the vehicle body portion and the slide door portion.

FIG. 8 shows a waveform corresponding to each data of the control signal. Here, data is transmitted by a PWM (Pulse Width Modulation) modulation method, and the data value is distinguished by the difference in the time at which the high level is held.
The pulse width of the waveform 91 indicating "0" is the shortest, and the pulse width of the waveform 92 indicating "1" is about twice that of "0". Waveform 93 showing start of message (SOM)
Is set to about 3 times the pulse width of "0", and the waveform 94 indicating the end of message (EOM) is set to about 4 times the pulse width of "0".

FIG. 9 shows the bit configuration of various control signals transmitted from the vehicle body to the slide door. In the figure, a column 101 on the left side shows states of various operation switches provided in the driver's seat, a column 102 in the center shows communication contents of control signals corresponding to states of the switches, and a column 103 on the right side.
Shows the bit configuration of each control signal.

When the power window up switch is ON (104), 02H (hexadecimal) data is transmitted. When the down switch of the power window is on (105), 03H data, when the door lock switch is on (106), 04H data, and when the unlock switch is on (107), 05H data. Each is sent. The switch off (108) indicates that all the switches are turned off from the state in which any one of the switches is turned on, and the data of 01H is sent. For example, when the power window up switch is pressed, 02H data is transmitted, and when the switch is released, 01H data is transmitted.

06H is transmitted when the control signal indicating the communication recognition mode end flag (109) is transmitted, and 07H is transmitted when the instruction (110) for prohibiting the operation acceptance of each switch on the door side is sent, and the prohibition is performed. Instruction to cancel (111)
Is sent, data of 08H is transmitted. The closure lock (112) is a command to lock the slide door by the closure 55, and the closure lock release (113) is a command to release the lock by the closure 55 and open the slide door by operating the door handle. And 09H, respectively
Data of 0AH is transmitted.

FIG. 10 shows the bit configuration of various control signals transmitted from the sliding door side to the vehicle body side. In the figure, a column 121 on the left side shows the states of various switches in the door, a column 122 in the center shows the communication contents of control signals corresponding to the states of the switches, and a column 123 on the right side shows the bit configuration of each control signal. Shows.

The half latch (124) is information indicating that the slide door is in the half door state, and is assigned data 01H. Closure operation completion flag (1
25) is information indicating that the operation of the closure 55 is completed and the sliding door is completely closed, and a control signal of 02H is assigned.

Next, the operation will be described. Since the operation of each circuit is the same when transmitting the control signal from the vehicle body to the slide door and when transmitting the control signal from the slide door to the vehicle body, here, the operation from the vehicle body to the slide door is performed. The case of transmitting a control signal will be described.
As shown in FIG. 3, when any switch, such as the power window up switch, is pressed, the corresponding input port 31d of the one-chip microprocessor 31 becomes low level through the pull-up circuit 34. The CPU 31a of the one-chip type microprocessor 31 constantly monitors the input port 31d, and outputs a control signal corresponding to the change of the state of the switch to the transmission circuit 32 through the output port 31e. For example, when the power window up switch is turned on, a control signal composed of SOM + 02H + parity “0” + EOM is serially transmitted.

FIG. 11 shows the waveform of the control signal sent when the up switch is turned on. Figure 11
5A shows the waveform of the control signal applied to the input terminal 65 of the transmission circuit shown in FIG. When the signal is applied to the base of the transistor 62, the transistor 62 is turned on while the control signal is high level and is turned off while the control signal is low level. As a result, the collector voltage of the transistor 62, that is, the voltage at the connection point between the coil element 61 and the collector changes as shown in FIG. Therefore, the current flowing through the coil element (the transmitting coil element 24a of the vehicle body side connector 20a) changes according to the control signal, and a corresponding magnetic flux is generated.

In response to the change in the magnetic flux, an electromotive force is generated in the receiving coil element 28b of the door side connector 20b. The operation of the receiving circuit 43 of the door-side controller 40 will be described with reference to FIG. At both ends of the coil element 71 (reception coil element 28b), the waveform as shown in FIG. 11C is generated by receiving the magnetic flux from the coil element on the other side. The comparator 72 compares the threshold voltage obtained by dividing the power supply voltage by the resistors 73a and 73b with the voltage generated in the coil element 71 to perform binarization and convert it into a square wave. After that, it is non-inverted and amplified by the operational amplifier 74, converted into the waveform (FIG. 11d) in which the amplitude is the power supply voltage (5 volts) and the phase is inverted by the transistor 75, and the signal is output from the output terminal 76 of the receiving circuit.

The output waveform of the receiving circuit is input to the interrupt terminal 41f of the one-chip type microprocessor 41 of the door-side controller 40. The one-chip microprocessor 41 determines that the length of the period in which the signal applied to the interrupt terminal 41f is low level is the period in which the control signal sent from the transmitting side is high level, and the control signal Determine the contents of.

In the example shown in FIG. 11, the one-chip type microprocessor 41 recognizes that the control signal of 02H is sent from the vehicle body side and turns on the relay circuit so as to raise the power window in the door. Put in a state.

As described above, since the control signal is transmitted between the body of the vehicle body and the slide door by utilizing the electromagnetic induction phenomenon, an oxide film, displacement, and mud attached to the surface of the coil element are generated. Since it is unlikely to be affected by dirt on the, stable transmission state can be secured. Further, since various communication contents are encoded into a control signal of a digital signal composed of a plurality of bits and the signal is serially transmitted between the vehicle body part and the slide door part, one set of coil elements is used. The control content of can be transmitted.

Further, since the door side controller 40 collectively controls the transmission parts in the sliding door part, even if the electric parts on the door side are increased, the door side controller 40 is increased.
Alternatively, it can be dealt with only by exchanging the control software, and expansion of equipment can be dealt with quickly and easily.

Next, an embodiment will be described. In the reference mode, a set of coil elements for transmitting a control signal from the vehicle body portion side to the slide door portion side and a set of coil elements for transmitting a control signal from the slide door portion side to the vehicle body portion side are individually provided. However, in the embodiment, each coil element is used for both transmission and reception, and one set of coil elements enables bidirectional communication. FIG. 1 shows an embodiment of the present invention. The structure of the power supply contact portion of the connector is the same as that shown in FIG. Since the coil element portion is used for both transmission and reception, only one set of the vehicle body side communication coil element 201a and the door side communication coil element 201b is provided.
The body side controller 203 includes a power window switch 205 and a central door lock switch 206.
The door side controller 204 has a power window 5
1, a closure 55, etc. are connected respectively.

The circuit configurations of the body-side controller 203 and the door-side controller 204 are almost the same as those shown in FIGS. 3 and 4, but since one communication coil element 201 is used for both transmission and reception, the transmission circuit 32 is used. , 42 and the receiving circuits 33, 43 are different. That is, instead of the transmission circuit and the reception circuit, a transmission / reception circuit combining these circuits and the switching circuit thereof is provided.

FIG. 12 shows a circuit configuration of a transmission / reception circuit in the body side controller 203 and the door side controller 204. The transmission unit of the transmission / reception circuit includes a first transistor 216, a second transistor 212,
It is composed of a third transistor 214 and the like. The emitter of the pnp type second transistor 212 is connected to the power supply voltage side, and one end 201c of the communication coil element 201 is connected to the collector thereof. Second transistor 21
The connection point 201c between the second collector and the coil element 201 is the non-grounded potential side output end of the transmitter.

The other end 201d of the communication coil element 201
Is connected to the collector of the npn-type third transistor 214, and the emitter of the second transistor 212 is grounded. That is, the connection point 201d to the collector of the third transistor 214 is the ground potential side output terminal of the transmitter.

The collector of the npn-type first transistor 216 is connected to the power supply voltage side via the resistor 218, and the collector is connected to the second side via the resistor 220.
Is connected to the base of the transistor 212. The emitter of the first transistor 216 is grounded,
A transmission / reception switching terminal 224 is connected to the base of the transistor 216 via a resistor 222, and a transmission / reception switching signal is input through the terminal.

The base of the third transistor 214 is connected to its emitter via a resistor 226. A resistor 228 is provided at the base of the third transistor 214.
A control signal output terminal 230 is connected via the terminal, and a control signal to be transmitted to the other party is input via the terminal.

The receiving portion of the transmitting / receiving circuit is the comparator 24.
0, operational amplifier 242, fourth transistor 244, fifth transistor 246 and the like. An upper end 201c of the communication coil element 201 on the side connected to the collector of the second transistor 212 is connected to the non-inverting input of the comparator 240. The power supply voltage is applied to the resistor 248 at the inverting input of the comparator 240.
The threshold voltage divided by a and 248b is applied. The resistor 249 is for giving the comparison characteristic hysteresis.

The output of the comparator 240 is amplified by the non-inverting amplifier circuit portion constituted by the operational amplifier 242 and the like, and the output of the operational amplifier 242 is connected to the base of the fifth transistor 246 via the resistor 250. The collector of the fifth transistor 246 is connected to the power supply voltage side via the resistor 252, and the collector of the fifth transistor 246 receives the output signal of the receiving unit 254 (one-chip microprocessor 3).
1, the interrupt terminal of the one-chip type microprocessor 41)
Connected with. The emitter of the fifth transistor 246 is grounded, and the resistor 25 is connected between the base and the emitter.
Connected at 6.

The collector of the fourth transistor 244 is
It is connected to the base of the fifth transistor 246 via the resistor 250. The emitter of the fourth transistor 244 is grounded and the emitter-base of the fourth transistor 244 is connected via a resistor 258. The base of the fourth transistor 244 is the resistor 26
It is connected to the transmission / reception switching terminal 224 via 0.

Next, the operation of the transmission / reception circuit will be described. FIG. 13 schematically shows a state of each transistor when the communication coil element 201 is used for transmission. In the transmission mode in which the communication coil element 201 is used for transmission, a high-level switching signal is input to the transmission / reception switching terminal 224. In addition, the control signal output terminal 230
A control signal to be transmitted to the other party is input to. When the transmission / reception switching terminal 224 becomes high level, the first transistor 216 is turned on and the second transistor 21 is turned on.
The base of 2 becomes low level. As a result, the second transistor 212 is turned on, and the communication coil element 2
The upper end portion 201c of 01 is connected to the power supply voltage side.

In this state, the third transistor 214 is driven by the control signal input from the control signal output terminal 230.
When is turned on and off, a current flows through the communication coil element 201 accordingly, and a magnetic flux that changes according to the control signal is generated from the communication coil element 201.

The high level switching signal input from the transmission / reception switching terminal 224 is the fourth transistor 244.
Since it is also applied to the base of, the fourth transistor 244 is turned on during the transmission mode. As a result, the fifth
The base potential of the transistor 246 is held at a low level, and the fifth transistor 246 is fixed in an off state. Therefore, during the transmission mode, a high level signal is always input to the reception terminal 254. Since the one-chip type microprocessor 31 and the one-chip type microprocessor 41 recognize the inverted signal from the receiving terminal 254 as the control signal received from the other party, during the transmission mode, neither control signal is received. Recognized as not present.

FIG. 14 schematically shows the state of each transistor when the communication coil element 201 is used for reception. In the reception mode in which the communication coil element 201 is used for reception, the transmission / reception switching terminal 22
A low-level switching signal is input to 4. A high level signal is always input to the control signal output terminal 230. When the transmission / reception switching terminal 224 becomes low level, the first
Of the second transistor 212 is turned off, and the base of the second transistor 212 becomes high level. as a result,
The second transistor 212 is turned off, and the upper end portion 201c of the communication coil element 201 is disconnected from the power supply voltage side.

Further, since a high level signal is applied to the control signal output terminal 230, the third transistor 214 is turned on, and the lower end portion 201d of the communication coil element 201 is almost at ground potential. As a result, the communication coil element 201 is disconnected from the transmitter, and electrically connected to only the comparator 240 on the receiver side.

Further, by inputting a low level switching signal from the transmission / reception switching terminal 224, the base of the fourth transistor 244 becomes low level, and the fourth transistor 244 is turned off during the reception mode. As a result, the base potential of the fifth transistor 246 follows the output level of the operational amplifier 242, and the fifth transistor 246 is turned on / off according to the output value of the operational amplifier 242. Therefore, a waveform obtained by inverting the phase of the output of the operational amplifier 242 with an amplitude of 5 volts is the reception terminal 2
It is output from 54.

As described above, one communication coil element 201 is provided.
By switching between the two for transmission and reception, one set of communication coil elements 201 can perform bidirectional communication between the body part side and the slide door part side, and the size and cost of the connector can be reduced. You can

By the way, the following functions can be provided by utilizing the transmission of the control signal from the slide door portion side to the vehicle body portion side. For example, the fact that the door has been completely closed by the closure 55 is transmitted from the sliding door portion to the vehicle body portion, and the vehicle body portion side receives the control signal after the door is opened. It is prohibited to operate various switches on the electrical components of the sliding door.

This makes it possible to prevent malfunctions and the like in the half-door state. Further, by transmitting the half-latch information from the slide door portion to the vehicle body portion, it is possible to more reliably recognize the half-door state on the vehicle body portion side as compared with the case where the determination is made by the door switch.

Next, the operation for switching the coil element between the transmitting element and the receiving element will be described by taking the operation when the slide door is closed as an example.

FIG. 15 shows an operation flow of the door side controller 204, and FIG. 16 shows an operation flow of the body side controller 203. When the slide door is open, there is no power supply from the body of the vehicle body, so the door-side controller 204 is in a state in which its operation is stopped. When the sliding door is in a substantially half-door state and the power supply contacts 22a and the like are in contact with each other, the door-side controller 204 starts its operation, and the power is supplied from the vehicle body based on the potential from the power supply voltage dividing circuit 49. After confirming the normal supply, the process shifts to the process shown in FIG.

The door-side controller 204 first checks whether or not the operation of the closure 55 has been completed (step S301). Normally, the closure 55 is in a non-operating state immediately after the sliding door is in the half-door state and the power supply is started from the vehicle body side.
In this way, when the operation of the closure 55 is not completed (step S301; N), reception of information system communication with the vehicle body is prohibited (step S302), and subsequently reception of switch system communication is prohibited. Ban.

Here, the information communication refers to a control signal which is not related to the switch operation, and includes the communication recognition mode end flag 109, the half latch 124 shown in FIGS. 9 and 10.
The closure operation completion flag 125 or the like corresponds. The switch-based communication is a control signal based on the operation of various switches such as a power window up switch, and the P / W-UP 104 and P / W-DOWN1 shown in FIGS. 9 and 10.
05 etc. correspond.

Next, the door-side controller 204 operates the closure 55 in a state in which various communication with the vehicle body is prohibited and closes the sliding door from the half-door state to the fully closed state. It is controlled so as to be embedded (step S304).

When the operation of the closure 55 is completed, the CPU 41a of the door side controller 204 sets flag information indicating that to a predetermined area of the RAM 41c.
After that, acceptance of information communication is permitted (step S3
05), if the control signal for closing the closure has not been transmitted to the body of the vehicle body (step S306;
N), a high level is output to the transmission / reception switching terminal 224 (step S307), and the coil element 201b is set to be used for transmission.

After the communication coil element 201b on the door side is set for transmission, a control signal 125 indicating completion of closure operation is transmitted toward the body of the vehicle body (step S).
308). Door side controller 204 upon completion of transmission
The CPU 41a sets a flag indicating the end of transmission of the closure operation completion in a predetermined area of the RAM 41c.

Thereafter, the transmission / reception switching terminal 224 is set to low level (step S309), and the door side communication coil element 201b is set to be used for reception.

Initially, the body side controller 203 sets the transmission / reception switching terminal 224 to the low level and sets the vehicle body side communication coil element 201a for reception, and a control signal indicating completion of closure operation from the slide door portion side. Waiting for the message to be sent (FIG. 16, step S40).
1; N). When the control signal for completion of closure operation is received (step S401; Y), the body-side controller 2
03 is a response signal, that is, when the control signal 109 indicating the end of the communication recognition mode has not been transmitted to the slide door portion (step S402; N), the transmission / reception switching terminal 2
A high level is output to 24 (step S403), and the vehicle body side communication coil element 201a is set for transmission. Then, the control signal 109 indicating the end of the communication recognition mode is transmitted to the sliding door portion side (step S404).

After that, the body side controller 203 sets the transmission / reception switching terminal 224 to the low level again, and sets the vehicle body side communication coil element 201a for reception (step S405).

When the door-side controller 204 confirms that the response signal has been sent from the body-side controller 203 side (FIG. 15, step S310; Y), it accepts the switch system communication from the vehicle body part. (Step S311).

In this way, the door-side controller 204
Sends a control signal to the body of the vehicle when the sliding door is completely closed, receives a response signal from the body of the vehicle, and then receives electrical signals from the body of the vehicle. Allows acceptance of control signals that instruct the operation of parts.

After that, when the control signal of the switch system is received from the body part of the vehicle body (step S312; Y), the door side controller 204 controls the operation of the electric components inside the door according to the received control signal (step S313). ). For example, when the control signal for instructing the door lock is received, the electromagnetic door lock is operated to lock the door. When the operation switch on the slide door side is pressed while the switch system is allowed to be accepted (step S31
4; Y), and controls the operation of the electrical components inside the door in response to the operation (step S313).

On the other hand, the body-side controller 203 monitors whether or not the operation switch is pushed down to the driver's seat or the like after the completion of sending the response signal (step S406), and any switch operation is performed. When it is broken (step S40
6; Y), the communication coil element 201a on the vehicle body side is temporarily switched to transmission (step S407), and a control signal corresponding to the contents of the switch operation is transmitted to the slide door side (step S408). Then, after transmitting the control signal, the communication coil element 201a on the vehicle body side is switched again for reception (step S409).

In this way, the body side controller 20
3. The door-side controller 204 temporarily sets the coil element 201 for transmission only when it is necessary to transmit a control signal to the other party, and always sets the coil element 201 for reception when the control signal is not transmitted. It is supposed to switch.

Although the transmission timings may collide with each other, in the above example, the transmission from the door side to the body part of the vehicle body is limited to immediately after the sliding door is closed. No signal collisions occur. Further, in order to avoid the collision of the control signal, a response from the other party is received every time the control signal is transmitted, and when the response does not arrive, it is determined that a collision has occurred, and then the body side controller 203 and the door The control signal may be retransmitted at different time intervals from the side controller 204.

In the reference mode and the embodiment described above, the control signal is transmitted by the PWM modulation method. However, the transfer rate of each bit is set in advance, and the information of "0" and "1" is determined by the presence or absence of the pulse. It may be transmitted. Further, in the embodiment, the third transistor 214 which is turned on / off by the control signal is provided on the ground potential side of the communication coil element 201, but this is for noise reduction, and the power supply is more effective than the communication coil element 201. It may be provided on the voltage side. Further, the third transistor 214 may be removed and the second transistor 212 may also function as the modulation function of the third transistor 214.

That is, the PWM modulation may be performed by the second transistor 212 in the transmission mode, the second transistor 212 may be turned off in the reception mode, and the communication coil element 201 may be disconnected from the power supply. Further, although the connection of the communication coil element 201 is switched by the transistor, whether the communication coil element 201 is connected to the transmission circuit by a relay switch or the like,
The connection to the receiving circuit may be switched.

Further, in the embodiment, the output signal of the receiving circuit is held at the high level in the transmission mode. However, such a function is not provided and the one-chip microprocessor 41 performs the soft processing. The input from the interrupt terminal 41f may be ignored during the transmission mode.

[0094]

According to the signal transmission device of the present invention,
Since the control signal is transmitted between the body of the vehicle and the sliding door by using the electromagnetic induction phenomenon, it is less likely to be affected by the oxide film, displacement, and dirt attached to the surface of the coil element. It is possible to secure a stable transmission state. In addition, since the coil element is used by switching between transmitting and receiving, bidirectional communication can be performed by providing only one coil element on each of the body part side and the slide door part side, and downsizing and cost reduction of the connection connector can be achieved. Can be planned.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a signal transmission device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a schematic configuration of a signal transmission device according to a reference aspect of the present invention.

FIG. 3 is a block diagram showing a circuit configuration on the body side in the signal transmission device according to the reference mode of the present invention.

FIG. 4 is a block diagram showing a circuit configuration on the door side in the signal transmission device according to the reference mode of the present invention.

FIG. 5 is a circuit diagram showing a transmission circuit of a signal transmission device according to a reference aspect of the present invention.

FIG. 6 is a circuit diagram showing a receiving circuit of a signal transmission device according to a reference aspect of the present invention.

FIG. 7 is an explanatory diagram showing a data structure of a control signal transmitted through a coil element between a vehicle body part and a slide door part.

FIG. 8 is an explanatory diagram showing waveforms corresponding to respective data of control signals.

FIG. 9 is an explanatory diagram showing a bit configuration and the like of various control signals transmitted from the vehicle body part to the slide door part side.

FIG. 10 is an explanatory diagram showing a bit configuration and the like of various control signals transmitted from the sliding door portion side to the vehicle body portion side.

FIG. 11 is an explanatory diagram showing a waveform of a control signal transmitted when an up switch of a power window is turned on.

FIG. 12 is a circuit diagram showing a circuit configuration of a transmission / reception circuit in the signal transmission device according to the exemplary embodiment of the present invention.

FIG. 13 is an explanatory diagram schematically showing a state of each transistor when the communication coil element is used for transmission in the transmission / reception circuit of the signal transmission device according to the exemplary embodiment of the present invention.

FIG. 14 is an explanatory diagram schematically showing a state of each transistor when the communication coil element is used for reception in the transmission / reception circuit of the signal transmission device according to the exemplary embodiment of the present invention.

FIG. 15 is a flowchart showing an example of an operation flow when the door-side controller switches a coil element for transmission and reception.

FIG. 16 is a flowchart showing an example of an operation flow when the body-side controller switches the coil element for transmission and for reception.

FIG. 17 is an explanatory diagram showing a signal transmission device that has been conventionally used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Signal transmission device 20 ... Connection connector part 20a ... Vehicle body side connection connector 20b ... Door side connection connectors 22, 26 ... Power feeding contacts 24a, 28a, 61 ... Coil element for transmission 24b, 28b, 71 ... Coil element for reception 30 , 203 ... Body side controllers 31, 41 ... One-chip type microprocessors 32, 42 ... Transmission circuits 33, 43 ... Reception circuits 40, 204 ... Door side controller 51 ... Power window 53 ... Actuator 55 ... Closure 57 ... Half switch 59 ... Handle switch 62, 75, 212, 214, 216, 244, 246
... Transistors 72, 240 ... Comparators 74, 242 ... Operational amplifiers 201, 201a, 201b ... Communication coil element 224 ... Transmission / reception switching terminal

Continuation of the front page (56) Reference JP-A-63-283439 (JP, A) JP-A-9-266643 (JP, A) JP-A-58-199244 (JP, A) JP-A-2-14920 (JP , A) JP 58-199246 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G08C 19/08

Claims (3)

(57) [Claims] 1. A signal transmission device for transmitting a control signal between a vehicle body portion and a slide door portion, wherein the vehicle body portion and the vehicle body portion are close to each other within a predetermined distance when the slide door portion is closed. A coil element is provided on each of the slide door portion, and a coil element provided on the slide door portion and a coil element provided on the vehicle body portion are used to generate an electromagnetic induction phenomenon between the slide door portion and the vehicle body portion. The control signal is transmitted between them, and the control signal sent from the other party is reproduced based on the transmission circuit for applying the control signal to be transmitted to the other party to the coil element and the electromotive force generated in the coil element. A reception circuit and a transmission / reception switching circuit that selectively switches which of the transmission circuit and the reception circuit is connected to the coil element are provided, and the same coil element is provided. A child is used for both transmission and reception of the control signal, and bidirectional communication is performed between the vehicle body portion and the slide door portion, and the coil element is connected to the reception circuit. The coil element and the switch element are arranged between the output terminal on the ground potential side and the output terminal on the non-ground potential side of the transmission circuit so that the switch element is closer to the output terminal on the non-ground potential side. Which of the dummy signal of the predetermined potential and the output signal of the receiving circuit, which are connected to each other in series and which recognize that the digital circuit to which the output signal of the receiving circuit is input are false, are input to the digital circuit. A signal switching means for selectively switching, when the coil element is used for transmission, the switch element is turned on and an output terminal on the non-ground potential side of the transmission circuit and the coil element The signal switching means is set so that the dummy signal is selected as an input signal to the digital circuit while electrically connecting the two, and when the coil element is used for reception, the switch element is turned off and the transmission circuit is set. A signal characterized by setting the signal switching means such that the output terminal of the receiving circuit is selected as an input signal to the digital circuit while opening between the non-ground potential side output terminal and the coil element. Transmission equipment. 2. The control signal is a digital signal composed of a plurality of bits, and the signal is serially transmitted between the vehicle body portion and the slide door portion.
The signal transmission device according to. 3. The coil element on the side of the slide door and the coil element on the side of the vehicle body transmit the control signal by an electromagnetic induction phenomenon in a half-door state in which the slide door is not completely closed. The signal transmission device according to claim 1 or 2, wherein the signal transmission devices are arranged so as to approach each other at a distance to obtain.