JPH0683083B2 - Wireless transmitter for vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle wireless transmission device mounted on a vehicle and transmitting a predetermined wireless signal.

<Background of the Invention> The applicant of the present application has previously filed Japanese Patent Application No. 57-132118 (Japanese Patent Laid-Open No. 59-132118).
24075) proposed a "radio type key system". This radio wave type key system is applied to, for example, a door lock of a vehicle, and a driver has a transmitter instead of possessing a key, and only when the one carrying this transmitter operates a switch provided on the door. The door lock is unlocked or locked.

FIG. 1 is a block diagram showing a schematic configuration of the radio wave type key system (hereinafter, referred to as a vehicle locking control device). In the figure, the transmitter 1 is housed in a card type case, and the card type transmitter 1 is carried by a driver instead of the mechanical key of the vehicle 18.

On the other hand, the control device 2 is mounted on the vehicle 18 side, the loop antenna 10 is further provided on the window, and the switch 12 is provided near the door handle of the driver side door.

The card type transmitter 1 is always in a power-on state and is in a state capable of receiving a request signal transmitted from the control device 2 on the vehicle body side. Then, when the driver carries out the card type transmitter 1 and manually operates the switch 12 in order to unlock the door lock, the request signal generating circuit 11 in the control device 2 shown in FIG. 1 operates. Then, the request signal is transmitted from the loop antenna 10 for a certain period of time. The request signal transmitted from the loop antenna 10 is received by the loop antenna 3 of the card type transmitter 1 by the electromagnetic induction effect. On the card type transmitter 1 side, the request signal detection circuit 7 detects that the request signal is transmitted from the control device 2 on the vehicle 18 side, and activates the code signal generation circuit 8.

When the code signal generation circuit 8 is activated, a code signal unique to the vehicle 18 (a different code is set for each vehicle) stored in the code storage circuit 9 in advance is output. Then, the modulating circuit 5 modulates the carrier signal supplied from the carrier oscillating circuit 6 with the code signal, and transmits it via the output circuit 4 and the loop antenna 3.

Then, on the vehicle side, the unique code signal transmitted from the card type transmitter 1 is received by the loop antenna 10, and the received unique code signal is passed through the reception / demodulation circuit 13 to the code matching circuit 14 Is supplied to.

The code matching circuit 14 determines whether or not the vehicle-specific code signal registered in advance in the code storage circuit 15 and the received code signal match, and both code signals match. The actuator drive circuit 16 is driven only in the case.

When the actuator drive circuit 16 is driven, the actuator 17 that locks / locks the door lock is driven to unlock the door lock.

In this way, the door lock is unlocked / locked only when the code signal on the card type transmitter 1 side and the code signal registered on the control circuit 2 on the vehicle side coincide with each other. Even if a person who does not have the model transmitter 1 tries to unlock the door lock, the door lock is not unlocked. Further, even if a person carrying the card type transmitter 1 having a different code signal tries to unlock the door lock, the door lock is not unlocked in the same manner. As a result, the card-type transmitter 1 has the same security as the conventional mechanical key. Further, since the card type transmitter 1 can be used while being stored in a pocket, a bag or the like,
Every time you unlock or lock like a conventional mechanical key,
This saves the trouble of taking out the key.

By the way, in a device such as the vehicle lock control device that emphasizes crime prevention and safety, it is necessary to always have a reliable crime prevention under various circumstances.

For example, when a driver carrying the card type transmitter 1 gets off the vehicle and gets out of the vehicle after getting off the vehicle, the transmission distance of transmission / reception signals between the card type transmitter 1 and the vehicle-side control circuit 2 is possible. When the driver is far from the vehicle,
This is impossible even if a third party tries to unlock the door lock. However, when the driver is within the communicable distance, transmission / reception between the card type transmitter 1 and the vehicle-side control 2 is possible. Therefore, when the driver is several meters away from the vehicle, When a person operates the switch 12, the door lock is unlocked, which may lead to theft or the like.

Therefore, in such a vehicle lock control device, it is required to limit the signal transmittable distance to a short range within 1.5 to 2.0 m from the vehicle. However, if this is attempted to be achieved by reducing the strength of the signal to be transmitted, external noise or the like may cause a malfunction, which is difficult to apply.

In particular, in the vehicle lock control device as described above, the card type transmitter possessed by the driver is used as a substitute for the mechanical key. It is only necessary to prevent the code signal from being transmitted from the card type transmitter when the user attempts to unlock.

«Object of the Invention» An object of the present invention is to make it possible to limit the communicable distance of a radio signal transmitted from a transmitter mounted on a vehicle body to a specific range, and to have a strength sufficient for reliable transmission. Another object of the present invention is to provide a vehicle wireless transmission device capable of transmitting a wireless signal.

<< Structure of the Invention >> The structure of the present invention will be briefly described below with reference to the claim correspondence diagram of FIG.

As shown in the figure, the vehicle wireless transmission device of the present invention receives a locking / unlocking operation start signal wirelessly transmitted from the vehicle body side, and wirelessly transmits a predetermined unique signal in response to the reception. Machine a, a transmission / reception unit b provided on the vehicle body side for transmitting the signal for starting the locking / unlocking operation and receiving the specific signal from the card type transmitter a, and the specific signal received by the transmission / reception unit b Unique signal collating means c for determining whether or not the predetermined signal matches a preset unique signal on the vehicle body side, a lock actuator d for locking / unlocking a predetermined portion of the vehicle body such as a door lock, and a manual operation. A switch e for instructing the transmitting / receiving means b to transmit a signal for starting the locking / unlocking operation, and the switch e is operated, and the unique signal collating means c And a lock actuator driving means f for driving the lock actuator d, and the transmitting / receiving means b is provided at a predetermined position on the vehicle body at appropriate intervals. A pair of antennas g for transmitting radio signals and a phase means h for phase-shifting the signals transmitted from the paired antennas g so as to have a phase difference of 180 ° from each other.
And a wireless transmission device for a vehicle, wherein a transmittable distance of the wireless signal is within a specific range.

<< Operation >> In the present invention, the phase shift means causes a phase difference of 180 ° between the radio signals transmitted from the paired antennas, and the radio signal transmittable distance is within a specific range.

<< Description of Embodiments >> FIG. 4 is a block diagram showing a configuration of a card type transmitter in an embodiment of the vehicle locking control device according to the present invention. This card type transmitter 30 includes a loop type antenna 31 and
A reception / demodulation circuit 32 for detecting the request signal,
The microcomputer 33, a memory 34 for storing a unique code, and a carrier oscillation circuit 36 and a modulation circuit 35 for transmitting a unique code signal are roughly configured.

FIG. 5 shows the microcomputer of the card type transmitter.
34 is a flowchart showing the contents of processing executed in 33. As shown in FIG.
Normally, the reception standby process (the process of step (1)) is performed until the request signal transmitted from the vehicle body side control device 40 described later is received, and when the request signal is received, the step (1) is performed. The determination result of is YES, and the processes of step (2) and step (3) are executed next.

As a result, the vehicle-specific code signal stored in the memory 34 in advance (for example, 4-bit 4-digit serial data set by a combination of "0" and "1") is read, and the read unique code is read. The pulse train signal corresponding to the data is output to the modulation circuit 35, whereby the operation of transmitting the radio signal carrying the unique code signal from the loop antenna 31 is performed.

On the other hand, a control device 40 as shown in FIG. 6 is mounted on the vehicle body side. The control device 40 is mainly configured by a microcomputer (hereinafter, referred to as CPU) 53, and the CPU 53 includes a microprocessor unit, an I / O interface circuit, a memory (ROM, RAM, etc.), and
It is equipped with a timer and the like.

The antennas 41a and 41b are loop antennas installed near the trunk lock of the vehicle body, and both of them are arranged at a predetermined interval.

The other pair of loop antennas 41c and 41d are arranged near the driver's seat side door. One loop antenna 41c is inside the mirror frame of the driver side door mirror, and the other loop antenna 41d is inside the driver seat. It is located in.

Push-button switches (hereinafter referred to as start-up switches) 62 and 63 are attached to the loop antennas 41a to 41d at predetermined positions on the outer surfaces of the driver's seat side door and the trunk.

One antenna 41b, 41 of each of the two pairs of loop antennas
The 180 ° phase shifters 42 and 43 are connected to d, so that the transmission signal and the reception signal are phase-shifted by 180 °.

The switching circuits 46a, 46b are responsive to the switching signal S ₁ output from the output port O _{3 of the} CPU 53, and the trunk side antenna pair 41a, 41a,
An analog switch circuit that activates either one of the antenna pair 41c or 41d on the driver side.

The door switch 57 is for detecting the open / closed state of the driver side door, and is turned on when the door is opened and turned off when the door is closed.

Similarly, the door switch 58 is provided on the passenger door and the rear 2
Is a switch for detecting the open / closed state of each door (in the case of a 4-door vehicle). It is ON when the door is open and OFF when the door is closed.
Becomes

The key switch 59 is a switch for detecting whether or not a key is inserted in the key cylinder of the ignition key switch in the driver's cab, and is turned on when the key is inserted in the key cylinder.

The lock knob switch 60 is a switch that is turned on when the door lock knob provided on the inner surface of the door on the driver's side is pushed in and a manual locking operation is performed.

The lock state detection switch 61 is a switch that detects the state of the door lock mechanism, and is a switch that is turned off when the door lock mechanism is in the locked state and turned on when the door lock mechanism is in the unlocked state.

The power supply start detection circuit 54 is turned on when any one of the switches 57 to 63 is turned on.
For 7,61, drive for a specified time when switching between ON and OFF,
The power supply 55 supplies power to each circuit. When the power holding signal S ₃ supplied from the output port O _{5 of the} CPU 53 arrives, the power supply is maintained regardless of the switch operation of each switch, and the power is supplied when the CPU 53 enters the standby state. Is configured to stop.

The relay 65 is driven when the trunk unlock signal S ₈ is output from the output port O ₈ of the CPU 53 and the transistor Tr ₁ is turned on, and the unlocking solenoid (not shown) of the trunk lock is driven to drive the relay lock. Is to be unlocked.

The relay 66 and the relay 67 are connected to the output port O _{7 of the} CPU 53,
The relay 67 is driven by turning on the transistors Tr ₂ and Tr ₃ by the door lock signal S ₇ and the door unlock signal S ₆ output from O ₆ , and the relay 67 drives a motor (not shown) for automatically opening and closing the door lock. The door lock is unlocked by rotating it in the forward direction, and the relay 66 locks the door lock by rotating the motor in the reverse direction.

The alarm signal S ₉ output from the output port O _{9 of the} CPU 53 is a signal for driving the alarm drive circuit 68 to blow the horn.

Further, a unique code is inputted from the input port I _{12 of the} CPU 53 via the multiplexer 69.

That is, the multiplexer 69 is provided with an input connector, and each terminal of this connector is open at the time of manufacture.

When the lock control device is sold and handed to the user, the unique code plug 70 stored together with the card type transmitter 30 is inserted into the connector of the multiplexer 69.

The unique code plug 70 corresponds to form 4-digit code data (each digit is represented by 4 bits) corresponding to the unique code stored in the circuit of the card type transmitter 30. It has a structure in which pins are short-circuited.

By inserting the unique code plug 70 into the connector of the multiplexer 69, the unique code data is supplied from the multiplexer to the CPU 53.

The paired loop antennas 41a, 41b and 41c, 41d
It is conceivable that, as its mounting position, it is installed at the mirror peripheral portions of the left and right door mirrors 71, 72 of the vehicle as shown in FIG. 7, for example. In addition, as shown in FIG.
The driver's seat and passenger seats 73, 74 in the vehicle may be configured to be installed inside the backrest. Further, although illustration is omitted, it is obvious that the door mirror may be attached to the fender mirror instead of the door mirror.

Further, the combination may be changed, for example, a pair of loop antennas 41c and 41d may be provided on the driver side door mirror 72 and the driver seat 73.

Next, FIG. 9 and FIG. 10 are flowcharts showing the contents of the processing executed in the CPU 53, and the operation of the apparatus of this embodiment will be described below with reference to the same drawings.

In FIG. 9 and FIG. 10, the portion surrounded by the broken line is the CPU 53.
It is a flow chart which shows the contents of the processing performed within.

Now, assuming that all door locks of the vehicle are locked, a driver carrying the above card-type transmitter 30 gets into the vehicle, and an example of operation when the driver side door lock is unlocked As described below.

As the operation performed by the driver, it is sufficient to manually operate the start switch 62 provided near the door handle of the driver side door.

As the above-mentioned start switch 62 is turned ON, the OR function
It is detected by 81 that any one of the start switches is turned on, and thereby the start operation (10) is executed. This startup operation (10) is a process of driving the power supply start detection circuit 54 and releasing the standby state of the CPU 53 to start the CPU.

The CPU 53 started by the starting operation (10) first performs the function detection and storage processing required by the processing (11).

This desired function detection and storage processing (11) is performed by the input port I
Start switches 62, 63 based on ₁₀ and I ₁₁ input status
Detects which switch of the
A process of temporarily storing the operated input port (I _{10 in} this case) in the function storage memory 86 is performed.

Next, the process (12) is executed to select the loop antenna for transmitting the request signal.

This is a process for activating a loop antenna pair provided in the vicinity of the ON-operated start switch based on the content of the function storage memory 86. In this case, the loop near the driver's seat side door is activated. The antenna pair 41c, 41d is activated. That is, the switching signal S from the output ports O ₂ and O ₃ , respectively.
_4, by the S ₁ is outputted, the switching circuit 46a, 46b, 48 is switched and set, the circuit to supply the request signal output through the modulator 49 the loop antenna pair 41c, to 41d The setting operation is performed.

Then, the process (13) is continuously executed and the output port
The drive signal S ₅ is supplied from O ₁ to the modulator 49, and the operation of modulating the carrier wave from the oscillator 50 into a request signal is performed. This request signal is transmitted as a radio signal from the activated loop antenna pair 41c, 41d.

At this time, the generation time of the request signal is configured to be transmitted by the timer 87 in the CPU 53 for a fixed time (for example, 100 msec).

The transmitting antenna selecting section 82 and the receiving antenna selecting section 83 in the figure are circuits composed of the switching circuits 46a, 46b, 48 and the like.

In this way, when the request signal is transmitted, on the card type transmitter 30 side, the code signal is wirelessly transmitted in response to the reception of the request signal, as described above.

In the vehicle body side control device 40, after performing the request signal transmission operation, the processing (14) is executed, and the vehicle body side control device 40 is in a standby state for receiving the unique code signal transmitted from the card type transmitter 30. .

The process (14) is a process for activating the loop antennas (in this case, the loop antennas 41c and 41d) corresponding to the start switch that has been turned ON, based on the contents of the function storage memory 86. By setting the switching signals S ₄ and S ₁ from O ₂ and O ₃ , the circuit is set so that the reception signal is input to the detector / demodulator 52.

Then, when the next process (15) is executed, the output port O ₄
The drive signal is supplied from the detector / demodulator 52 to the detector / demodulator of the code signal received by the loop antenna pair 41c, 41d, and the code signal component in the carrier liquid is extracted and A / D converted. After that, it is input from the input port I ₁ to the CPU 53.

At this time, in the CPU 53, the process (16) is executed, and the input unique code (hereinafter referred to as the receiving unique code) is input.
Is read and stored.

When the reception unique code is read and stored, the 10th
The process (17) shown in the figure is executed. This processing is performed by the unique code storage unit 84 (the multiplexer 69 and the unique code plug 70
The unique code data set on the vehicle body side (hereinafter referred to as the vehicle body side unique code) that is sent as serial data from This is a process for determining a match.

The vehicle body side unique code data supplied from the unique code storage unit 84 is stored in a register in the CPU and processed as parallel data.

Then, the process (18) is executed, and as a result of the above collation, it is determined whether or not both codes are “match”. If they are “match”, the next process (19) is executed. It

The process (19), the transistor Tr ₁ to Tr ₃ and relay
This is a process of supplying a drive signal to the actuator drive unit 85 composed of 65 to 67. In this case, it is determined that the driver's door start switch 62 has been turned on based on the contents of the function memory 86, and the lock state detection switch 61 is turned off (that is, the door lock is in the locked state). ) Is determined from the state of input port I ₉ .
When the door lock is in the locked state, the drive signal S ₆ is output from the output port O ₆ and the O of the transistor Tr ₃ is turned on.
N, the relay 67 is turned on and the door lock motor is normally rotated to unlock the door lock.

In this way, after the door lock is unlocked, the CPU 53 is in the standby state and is in the standby state until the next switch operation is performed.

On the other hand, if the determination result of the process (18) is NO, then the process (20) is executed. This process is started by the timer 88 that starts when the start switch is turned on.
Is a process of counting the number of times that the determination result of the coincidence determination process (18) is NO while the fixed time is being measured by.

If the number of counts exceeds the specified number within this fixed time,
The determination result of the next process (21) is YES.

As a result, next, the process (22) is executed, and the operation of stopping the operation of the CPU for a predetermined time is performed. At this time, it is also possible to generate the alarm output S ₉ and drive the alarm drive circuit 68 to sound the horn.

By such processing, for example, when the door lock is all locked and a child mischiefs and repeatedly turns on the start switches 62 and 63, a request signal is transmitted and battery power is supplied each time. It is possible to prevent the situation that consumes.

Although the unlocking operation of the door lock has been described above, the unlocking operation of the trunk lock or the locking operation of the door lock is performed in the same manner as the above-mentioned operation.

In this way, the person who possesses the card type transmitter 30 having the code that matches the unique code on the vehicle body side can activate the switch 6
The door lock and trunk lock are unlocked / locked only when 2,63 is turned on. Even if a person who does not have the above card-type transmitter 30 attempts to unlock the lock, the unlocking operation is performed. Is not done. Further, even if a person who has a card type transmitter with a different unique code signal tries to unlock the door, the door lock is not unlocked.

Furthermore, start switches 62 and 63 that give an opportunity to start unlocking and locking of each lock are provided for each lock,
As a result, those who have the card type transmitter 30
Only the lock to be unlocked or locked can be selected and activated.

For example, when it is desired to unlock only the trunk lock with all the door locks locked, by operating the trunk lock start switch 63, only the trunk lock can be unlocked.

The activation switches 62 and 63 are provided in the vicinity of the respective locks, that is, the door lock and the trunk lock, and can perform the unlocking / locking operation of the lock near the lock portion to be unlocked / locked. it can.

Further, the loop antenna pair 41a, 41b and 41 for each lock is
c and 41d are arranged in the vicinity of the activation switches 62 and 63, and the person who possesses the card type transmitter 30 can activate the activation switch 6
When the 2,63 is operated, the loop antenna on the vehicle body side and the loop antenna on the card type transmitter 30 side are close to each other so that reliable signal transmission can be performed.

Along with this, by limiting the signal transferable distance for each lock, when trying to unlock the trunk lock, for example, not only the antenna on the trunk lock side but also the antenna on the door lock side is transmitted. It is possible to prevent a situation in which a malfunction occurs due to a failure.

The apparatus of this embodiment is configured to further limit the signal transferable distance and further improve the anti-theft property. This is configured so that the 180 ° phase shifters 42, 43 transmit the request signals transmitted from the paired loop antennas 41a, 41b and 41c, 41d so that they have a phase difference of 180 ° with each other. As a result, a signal transmissible distance of about 1 to 2 m is realized from the loop antenna pair.

This will be described in detail below.

In general, it is known that the magnetic field generated by one loop antenna whose diameter is sufficiently smaller than the wavelength of the signal transmitted from the loop antenna is as follows.

_{^{H R = (ISe - jk R}} / 2π) × {(1 / R 3) + (jk / R 2)} cos θ ... (1) Hθ = (ISe - jk R / 4π) × {(1 / R 3 ) + (Jk / R ² ) − (k ² / R)} sin θ (2) Hφ = 0 (3) However, the above H _R , Hθ, and Hφ are provided with curved coordinates as shown in FIG. In that case, there are components in the R direction, θ direction, and φ direction of the magnetic field generated by the loop antenna ANT.

The above I is a current flowing through the loop antenna ANT.

The above S is the area of the surface formed by the loop of the loop antenna ANT.

The above k is a propagation constant (k = 2π / λ: λ is a wavelength). Here, the terms 1 / R ³ and 1 / R ² are the induced magnetic fields, and
The R term indicates the radiated magnetic field.

Next, based on the above equations (1) and (2), first, regarding the case where there is one loop antenna, the above equations (1) and (2)
Consider the magnetic field strength for each item of.

FIG. 12 shows a directivity pattern at a point at a distance R = 100 m from the loop antenna ANT. In the figure, the curve A showing the directivity of the dull shape is the 1 / R ² component of the above formulas (1) and (2) or
1 / R ³ component is shown (strictly speaking, the values of 1 / R ² component and 1 / R ³ component are slightly different, but they do not appear in the figure).

In addition, a curve B represented by two circular directivities in the figure is
It represents the 1 / R component of the above equations (1) and (2).

From the figure, the electromagnetic induction component (1 / R ² , 1 / R ³ component) is θ = 0.
It can be seen that a strong magnetic field is generated in the ° and 180 ° directions, and the radiation component (1 / R component) is strong in the θ = 90 ° and 270 ° directions.

Then these magnetic fields provide two loop antennas,
It is shown that 180 degrees phase shift of the signal generated from each loop antenna causes cancellation of the magnetic field in the distance.

Table 1 below shows θ = 0 ° and 90 ° (or 180 ° and 2)
The magnetic field strength when the signal is generated from one loop antenna at 70 °) and when the signal is generated from the two loop antennas by 180 ° phase shift is
It shows the result of expressing the attenuation value of the magnetic field strength generated by the two loop antennas in decibel against the magnetic field strength when the signal is generated by one loop antenna by comparing the point at 0m and the point at 0.5m. is there.

However, it shows the result when the distance between the two loop antennas is 1.7 m. Also, there is no 1 / R component of the magnetic field in the θ = 0 ° direction.

From Table 1 above, two loop antennas are provided, and by generating request signals for reverse phase shift from each,
Compared with the case where the request signal is transmitted by only one loop antenna, the attenuation is -25 to 32 dB at a distance (100 m), and the card type transmitter 30 hardly receives the request signal. In addition, there is almost no signal attenuation in the vicinity of the vehicle (0.5 m), which makes it possible to reliably transmit the request signal to the card type transmitter in the vicinity of the vehicle.

With such a configuration, in order to reliably transmit the request signal to the card type transmitter 30, even if the signal strength of the request signal is increased, the signal transmission is greatly attenuated at a distance from the vehicle. The distance can be limited to a short distance range around the antenna.

Therefore, for example, immediately after the driver gets off the vehicle, locks all the door locks, and leaves the vehicle, a third person operates the activation switch to operate the door switch while the driver is only a few meters away from the vehicle. It is possible to improve the anti-theft property without the risk of unlocking.

In the above embodiment, the signals transmitted from the paired loop antennas have a phase difference of 180 ° with each other, but in the present invention, the phase difference is 180 °. It may be before or after, and the signal transmissible distance can be varied by adjusting the phase difference.

<< Effects of the Invention >> As described in detail above, in the vehicle wireless transmission device of the present invention, the transmittable distance of the transmission signal can be limited to the short range around the antenna. This is extremely suitable for a device requiring anti-theft property such as a lock control device for lock.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a vehicle locking control device according to a prior application, FIG. 2 is a diagram showing an external appearance of the device and a mounting state on a vehicle, FIG. 3 is a diagram corresponding to claims of the present invention, FIG. 4 is a block diagram showing an electrical configuration of a card type transmitter in the device of one embodiment of the present invention, FIG. 5 is a flow chart showing the contents of processing executed in the card type transmitter, and FIG. 6 is the same. FIG. 7 is a circuit diagram showing an electrical configuration of a vehicle body side control device in the embodiment apparatus, FIG. 7 is a rear view of a vehicle body showing an example of mounting a loop antenna of the embodiment device, and FIG. 8 is a vehicle showing an example of mounting the loop antenna. Interior perspective view, FIG. 9 and FIG.
FIG. 10 is an operation flowchart showing the contents of processing executed in the vehicle body side control device, FIG. 11 is a schematic diagram showing a magnetic field generated from the loop antenna of the device of the embodiment, and FIG. 12 is an induction electromagnetic field of the antenna. FIG. 6 is a directional characteristic diagram of a radiated electromagnetic field. a: Card type transmitter b: Transmitting / receiving means c: Unique signal matching means d: Lock actuator e ... Switch f ... Lock actuator moving means g ... Antenna h ... Phase shifting means 30 ... Card Type transmitter 40 …… Vehicle side control device 41a to 41d …… Loop antenna 42,43 …… 180 ° phase shifter 53 …… CPU 62,63 …… Start switch

Claims (1)

[Claims] 1. A card type transmitter that receives a locking / unlocking operation start signal wirelessly transmitted from a vehicle body side, and wirelessly transmits a predetermined unique signal in response to the reception, and a locking / unlocking operation provided on the vehicle body side. A transmitting / receiving unit that transmits a signal for starting the locking operation and receives the unique signal from the card-type transmitter, and whether the unique signal received by the transmitting / receiving unit matches a unique signal preset on the vehicle body side. A unique signal collating means for determining whether or not, a lock actuator for locking / unlocking a lock on a predetermined part of the vehicle body such as a door lock, and a manual operation for transmitting a signal for starting locking / unlocking operation to the transmitting / receiving means. The lock actuator is driven only when the switch for commanding is operated and the switch is operated, and the unique signal matching means determines that the unique signals match. And a lock actuator drive means for operating the vehicle wireless transmission device, wherein the transmission / reception means is provided at a predetermined position of a vehicle body at appropriate intervals, and has at least a pair of antennas for transmitting a wireless signal, and the pair of antennas. Phase means for phase-transmitting the signals transmitted from the antennas so as to have a phase difference of 180 ° with each other,
A wireless transmission device for a vehicle, comprising: a transmission range of the wireless signal within a specific range.