JPH09144411A - Keyless entry device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the interference of ID code signals transmitted from a plurality of portable transmitters even when a plurality of the transmitters simultaneously receive a search signal. SOLUTION: A transmitter receiving a search signal instantaneously transmits an ID code signal through an antenna 45 from a transmission circuit 37. Since the transmitter transmits the ID code signal from the transmission circuit 37 after a delay time T passes by a delay circuit after the transmitter receives the search signal, a plurality of ID code signals are transmitted without interference, and a plurality of the ID code signals can be received successively while displacing timing in a receiver 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyless entry device for controlling locking / unlocking of a door of a vehicle according to the presence or absence of radio waves transmitted from a transmitter portable by a driver.

[0002]

2. Description of the Related Art Conventionally, as a keyless entry device,
For example, JP-A-5-15685 shown in FIGS. 7 (a) and 7 (b)
The one described in Japanese Patent Publication No. 1 is known.

This keyless entry device is a receiver 10
1 constantly generates a search signal for searching the transmitter, and when the transmitter 131 receives the search signal from the receiver 101, it transmits a door unlock signal having a predetermined ID code. On the other hand, the receiver 101 is the transmitter 131
When the ID code transmitted from the vehicle is received and the ID code matches the vehicle-specific code, the output circuit 1
A door unlock signal is output from 23 to unlock the vehicle door. Further, the receiver 101 locks the vehicle door by outputting a door lock signal from the output circuit 123 after the ID code signal from the transmitter 131 is no longer received.

In this way, when the driver is within the range where the search signal generated from the receiver 101 can be received, the transmitter 131 carried by the driver automatically transmits the radio wave having the ID code signal. Is received by the receiver 101, the door can be unlocked without any switch operation, and when the driver leaves the search signal reception range, the radio wave having the ID code signal can be received. There is an advantage that the door can be automatically locked.

[0005]

However, in the conventional keyless entry device, when the transmitter 131 receives the search signal from the receiver 101, it immediately transmits the radio wave having the ID code signal. 8A and 8B, when a plurality of people carry the transmitter 131 and approach the vehicle at the same time, or when they are in the communication area at the same time, as shown in FIGS. Since the plurality of transmitters 131 receive the search signal and simultaneously transmit the radio waves having the ID code signal, there is a problem that the plurality of transmission radio waves interfere with each other and the receiver 101 cannot receive the transmission radio waves.

The present invention has been made in view of the above, and it is an object of the present invention to perform transmission by a plurality of transmitters even when a plurality of portable transmitters simultaneously receive a search signal.
It is to provide a keyless entry device capable of preventing interference of D code signals.

[0007]

According to the first aspect of the present invention,
In order to solve the above-mentioned problem, while transmitting a search signal for searching a portable transmitter from a receiver provided in a vehicle, the transmitter is set for each transmitter in response to reception of the search signal. In a keyless entry device that transmits an ID code signal and then unlocks the vehicle door when the ID code signal received by the receiver matches that set for the vehicle, the transmitter is The gist of the present invention is to have a transmitting means for transmitting the ID code signal after opening a preset delay time after receiving the search signal transmitted from the vehicle side.

In the invention according to claim 1, the transmitter, after receiving the search signal transmitted from the vehicle side,
By transmitting the ID code signal after opening a preset delay time, even when a plurality of portable transmitters simultaneously receive the search signal, the transmission time of the ID code signal transmitted by the plurality of transmitters can be set. It has the effect that it can be displaced.

In order to solve the above-mentioned problems, the transmitting means sets the delay time according to the delay time information transmitted from the receiver provided in the vehicle. And

According to the second aspect of the present invention, the delay time can be managed by the receiver by setting the delay time according to the delay time information transmitted from the receiver provided in the vehicle, and the delay time can be accurately managed. In addition, it has an effect that the transmission time can be shifted for each transmitter.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1A and 1B are views showing the overall configuration of a keyless entry device according to a first embodiment of the present invention.

In FIG. 1A, a receiver 1 mounted on the vehicle side has a search signal for searching a transmitter 31 and a battery power source 11 for supplying electric power to devices of an electric system provided in the vehicle. And a receiving circuit 15 for receiving a radio wave including a unique ID code signal transmitted from a transmitter 31 carried by the driver.
And a lock / unlock detection switch 17 for detecting whether the vehicle door is locked or unlocked.
And an input circuit 19 for inputting the locked state of the lock / unlock detection switch 17 and outputting it to the control circuit 21, and an ID code signal from the transmitter 31 received via the receiving circuit 15 matches a specific code. A control circuit 21 that determines whether or not to perform the output, and an output circuit that outputs a door lock signal or a door unlock signal to a door actuator incorporated in the vehicle door when the codes of the both match as the determination result of the control circuit 21. 23, an antenna 25 for collecting radio waves around the vehicle, and an antenna 27 attached to the vehicle for emitting radio waves including a search signal from the transmission circuit 13. The input circuit 19 outputs so that the vehicle door is turned off in the locked state and turned on in the unlocked state, for example.

On the other hand, in FIG. 1B, a transmitter 31 carried by a normal driver is a battery power source 3 for supplying power.
3, a receiving circuit 35 that receives a search signal for searching the transmitter 31 generated from the receiver 1, and a radio wave having a predetermined ID code according to the reception of the search signal by the receiving circuit 35. The transmission circuit 37, an ID code storage circuit 39 for storing a unique ID code, and a delay circuit 41 for arbitrarily setting the delay time from the reception of the search signal to the transmission of the ID code signal. Small antennas 43 and 45 are attached to the receiving circuit 35 and the transmitting circuit 37, respectively.

Next, the delay time setting operation in the transmitter of the keyless entry device will be described with reference to FIG. When using a plurality of transmitters 31, it is assumed that a different delay time is set for each transmitter. For example, transmitter A
Is zero and the delay time of transmitter B is T. At this time, the delay circuit 41 is set so that the delay time T 2> the transmission signal output time t 2 of the transmitter. Further, assuming that the delay time of the nth transmitter N is Tn, the delay circuit 41 is set so that the delay time Tn = (n-1) * T.

First, when a plurality of persons carry the transmitter 31 and are present within a communication area of a predetermined distance, the receiver 1 of the vehicle 1
The transmitting circuit 13 generates a search signal for searching the transmitter 31 and transmits the search signal from the antenna 27. Upon receiving this search signal, transmitter A immediately sends ID code signal A
Is transmitted from the transmission circuit 37 via the antenna 45. Next, the transmitter B receives the search signal and then delays the delay circuit 41.
Since the ID code signal A is transmitted from the transmission circuit 37 after the delay time T has passed, the plurality of ID code signals are transmitted without interference, and the receiver 1 sequentially shifts the timing of the plurality of ID code signals. Can be received.

Next, with reference to FIGS. 3 (a) and 3 (b), the manner in which the vehicle is locked / unlocked in accordance with the positions of the two transmitters A and B will be described. In this case, it is assumed that the transmitters A and B store the same ID code for locking and unlocking the same vehicle (a). Further, the vehicle (a) is unlocked when the transmitters A and B enter the communication area (b) within a predetermined range, while it is locked when the transmitters A and B leave the communication area (b).

When the transmitters A and B do not exist in the communication area (b), the transmission signals are not transmitted from the transmitters A and B even if the search signal is output from the vehicle (a). Holds the vehicle door locked. When transmitter A enters the communication area (b),
When the search signal is output from the vehicle (a), the transmission signal is transmitted from the transmitter A, so that the vehicle (a) changes the vehicle door from the locked state to the unlocked state. Further, when the transmitter B enters the communication area (b), when the search signal is output from the vehicle (a), the transmitters A and B transmit the transmission signals with different timings. (B) holds the unlocked state of the vehicle door. Here, even when the transmitter A goes out of the communication area (b), the transmitter B transmits the transmission signal when the search signal is output from the vehicle (a).
Holds the unlocked state of the vehicle door. Further, when the transmitter B goes out of the communication area (b), the transmission signal is not received by the vehicle (a) even if the search signal is output from the vehicle (a).
Changes the vehicle door from the unlocked state to the locked state.

(Second Embodiment) FIGS. 4A and 4B.
FIG. 6 is a diagram showing an overall configuration of a keyless entry device according to a second embodiment of the present invention. The feature of the receiver 1 of the keyless entry device shown in FIG.
(Electrically Erasable Programmable Read Only Mem
ory) and has an ID code storage circuit 27 for storing the same ID code as the transmitter 31 and an external SW 29 for setting the receiver 1 in the registration mode.

On the other hand, the transmitter 31 of the keyless entry device shown in FIG. 1B is characterized by having a control circuit 47 which controls the transmitter according to a control program and control data and has a timer for measuring a time interval. It is in.

Next, the registration process of the ID code and the setting process of the delay time in the keyless entry device will be described with reference to FIGS. 5 and 6. First, the transmitters A, B, and C whose ID codes are to be registered are prepared, and the battery 33 is removed. Next, in step J10 of the receiver 1, the external SW 29 of the receiver 1 is turned on to start the registration mode. Next, at step J20, the control circuit 21 erases the ID code registered in the ID code storage circuit 27. Next, in step J30, a radio wave having a search signal for searching the transmitter is transmitted from the transmission circuit 13.

Here, in transmitter A, step A10 is performed.
Then, the batteries 33 of the transmitter A are put in battery holders (not shown) one by one. Next, step A20
Then, when the search signal transmitted by the receiver 1 is received by the receiving circuit 35 via the antenna 43 after the transmitter 33 has been activated by the battery 33, when the receiving circuit 35 receives the ID code signal having the ID code A after 500 ms. It transmits from 37 via the antenna 45.

Next, in step J40 of the receiver 1, the first ID code A received via the receiving circuit 15 is registered in the ID code storage circuit 27. At this time, in step J50, the receiver 1 transmits from the transmission circuit 13 a command signal including "T = 0 ms" as delay time information for setting the delay time. Next, in step J60, a radio wave having a search signal for searching for the transmitter is transmitted from the transmission circuit 13.

On the other hand, in step A30 of the transmitter A, the command signal is received by the receiving circuit 35, and the delay time is set to "T = 0 m" according to the delay time information included in this command signal.
s ”is newly set in the ID code storage circuit 39.
Here, in step B10 of the transmitter B, the batteries 33 of the transmitter B are placed one by one in a battery holder (not shown). Next, in step B20, after the battery 33 is inserted into the transmitter B and activated, the search signal transmitted by the receiver 1 is received by the receiving circuit 3 via the antenna 43.
5, the ID code signal having the ID code B is transmitted from the transmitting circuit 37 via the antenna 45 after 500 ms.

On the other hand, in step A40, the search signal transmitted by the receiver 1 is received by the receiving circuit 35 via the antenna 43.
When it is received at, the ID code signal having the ID code A is transmitted from the transmission circuit 37 via the antenna 45 after the newly set 0 ms. It should be noted that the ID code A received by the receiver 1 is already registered in the ID code storage circuit 27 and is therefore ignored.

Next, in step J70 of the receiver 1, the second ID code B received via the receiving circuit 15 is registered in the ID code storage circuit 27. At this time, in step J80, the receiver 1 transmits a command signal including “T = 100 ms” as delay time information for setting the delay time from the transmission circuit 13. Next, step J90.
Then, the radio wave having the search signal for searching the transmitter is transmitted from the transmission circuit 13.

On the other hand, in step B30 of transmitter B, the receiving circuit 35 receives the command signal, and the delay time is set to "T = 100" in accordance with the delay time information included in this command signal.
ms ”is newly set in the ID code storage circuit 39. Here, in step C10 of the transmitter C, the batteries 33 of the transmitter C are inserted one by one into a battery holder (not shown). In C20, when the search signal transmitted by the receiver 1 is received by the receiving circuit 35 through the antenna 43 after the transmitter 33 has been activated by the battery 33 being inserted, the ID code signal having the ID code C is transmitted after 500 ms. The signal is transmitted from the circuit 37 via the antenna 45.

On the other hand, in step A50 of the transmitter A, when the receiving circuit 35 receives the search signal transmitted by the receiver 1 through the antenna 43, the newly set 0 m is set.
After s, the ID code signal having the ID code A is transmitted from the transmission circuit 37 via the antenna 45. Further, in step B40 of the transmitter B, when the search signal transmitted by the receiver 1 is received by the reception circuit 35 via the antenna 43, the transmission circuit 37 transmits the ID code signal having the ID code B after 100 ms newly set. From antenna 45
To send via. The ID received by the receiver 1
The code A and the ID code B are already the ID code storage circuit 2
Since it is registered in No. 7, it should be ignored.

Next, in the receiver 1, step J100
Then, the third ID code C received via the receiving circuit 15 is registered in the ID code storage circuit 27. At this time,
In step J110, the receiver 1 transmits a command signal including “T = 200 ms” as the delay time information for setting the delay time from the transmission circuit 13.

On the other hand, in step C30 of the transmitter C, the command signal is received by the receiving circuit 35, and the delay time is set to "T = 200" according to the delay time information included in this command signal.
ms ”is newly set in the ID code storage circuit 39.

In the second embodiment, the ID code and the delay time information are communicated and set between the receiver 1 and the transmitters A, B, and C, but the initial delay time of the transmitter is set. The setting value Td should be set to Td = (N-1) × T by using the minimum unit T of the delay time and the maximum number N of registrations of the receiver 1 obtained from the storage capacity of the ID code storage circuit 27. Then, the receiver 1 can newly set different delay time information in the transmitter according to the registration order of the transmitter, so that interference at the time of registration can be prevented.

As described above, the unique ID code stored in the ID code storage circuit 39 of the transmitter 31 is used as the I code of the receiver 1.
Since the delay time of the transmitter 131 is automatically set at the time of registration in the D code storage circuit 27, even when a plurality of portable transmitters simultaneously receive a search signal, the plurality of transmitters are also transmitted. It is possible to prevent interference of the ID code signal transmitted by, and improve the convenience of the keyless entry device.

Further, when a transmitter is lost and a new transmitter is to be re-registered, or when a new transmitter is additionally registered, a delay time can be automatically set for each transmitter. It is not necessary to prepare transmitters for different times, and it is possible to simplify management and operation of a plurality of portable transmitters.

[0033]

As described above, according to the first aspect of the invention, the transmitter opens the preset delay time after receiving the search signal transmitted from the vehicle side, and then transmits the ID code. By transmitting the signal, even when the portable transmitters simultaneously receive the search signal, the transmission timing of the ID code signals transmitted by the transmitters can be shifted, and the transmitters can transmit the ID code signals from the transmitters. It is possible to prevent interference due to transmitted radio waves.

According to the second aspect of the invention, the delay time can be managed by the receiver by setting the delay time according to the delay time information transmitted from the receiver provided in the vehicle. It is possible to accurately shift the transmission timing for each transmitter, and to prevent interference due to radio waves transmitted from a plurality of transmitters.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a keyless entry device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a delay time setting operation in a transmitter.

FIG. 3 is a diagram for explaining how a vehicle is locked and unlocked using two transmitters A and B.

FIG. 4 is a diagram showing an overall configuration of a keyless entry device according to a second embodiment of the present invention.

FIG. 5 is a diagram for explaining an ID code registration process and a delay time setting process in the keyless entry device.

FIG. 6 is a diagram for explaining an ID code registration process and a delay time setting process in the keyless entry device.

FIG. 7 is a diagram showing a configuration of a conventional keyless entry device.

FIG. 8 is a diagram showing a state in which a conventional keyless entry device causes interference of transmission radio waves.

[Explanation of symbols]

 1 receiver 11 battery power supply 13 transmission circuit 15 reception circuit 17 lock / unlock detection switch 19 input circuit 21 control circuit 23 output circuit 31 transmitter 33 battery power supply 35 reception circuit 37 transmission circuit 39 ID code memory circuit 41 delay circuit

Claims (2)

[Claims] 1. A search signal for searching a portable transmitter is transmitted from a receiver provided in a vehicle,
The transmitter transmits the ID code signal set for each transmitter in response to the reception of the search signal, and then the ID code signal received by the receiver matches that set for the vehicle. In this case, in the keyless entry device for unlocking the vehicle door, the transmitter has a transmitting means for transmitting an ID code signal after opening a preset delay time after receiving the search signal transmitted from the vehicle side. A keyless entry device having. 2. The keyless entry device according to claim 1, wherein the transmitting means sets the delay time in accordance with delay time information transmitted from a receiver provided in the vehicle.