JPH09279917A - Keyless entry device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent interference of radio waves transmitted from a plurality of portable transmitters even through the transmitters simultaneously receive search signals. SOLUTION: A transmitter 2 discriminates the coincidence between an ID code inherent to a receiver 1 and a previously registered ID code inherent to a remote receiver 1 with the use of a microcomputer 25, and if they are coincident with each other as a result of the discrimination, signals including an ID core inherent to the transmitter 2 are transmitted.

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. 6 (a) and 6 (b).
The one described in Japanese Patent Publication No. 1 is known. In this keyless entry device, the receiver 101 constantly generates a search signal for searching the transmitter, and when the transmitter 131 enters the communication area and receives the search signal from the receiver 101, a predetermined ID is received. Send a door unlock signal with code. On the other hand, the receiver 101 receives the ID code transmitted from the transmitter 131, and when the ID code matches the code unique to the vehicle, outputs the door unlock signal from the output circuit 123 to output the vehicle door. To unlock. 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 which has left the communication area is no longer received.

Thus, when the driver is in the communication area where the search signal generated from the receiver 101 can be received, the transmitter 131 carried by the driver automatically has the ID code signal. Since the radio wave is received by the receiver 101, the door can be unlocked without any switch operation, and when the driver leaves the search signal communication area, the radio wave having the ID code signal is received. This has the advantage that the door cannot be locked and the door can be locked automatically.

[0004]

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. 7 (a) and 7 (b), when a plurality of people carry the transmitters 131 and approach the vehicle at the same time, or when they are in the communication area at the same time. 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 an object thereof is to prevent interference of radio waves transmitted from transmitters even when a plurality of portable transmitters simultaneously receive a search signal. A keyless entry device is provided.

[0006]

According to the first aspect of the present invention,
In order to solve the above problem, when a portable transmitter enters a communication area within a predetermined distance from a receiver provided on a vehicle, the vehicle door is unlocked, while the transmitter is separated from the communication area. In this case, in the keyless entry device for locking the vehicle door, when the transmitter receives a search signal including an ID code unique to the receiver, the transmitter is pre-registered with the ID code unique to the receiver. And a transmitting means for transmitting a transmission signal including an ID code unique to the transmitter when the two match as a result of the determination. That is the summary.

In order to solve the above-mentioned problems, the invention according to claim 2 unlocks the vehicle door when a portable transmitter enters a communication area within a predetermined distance from a receiver provided in the vehicle. On the other hand, in a keyless entry device that locks the vehicle door when the transmitter leaves the communication area, when the receiver newly registers the transmitter, the receiver requests a registration request command and an ID unique to the receiver. While having a transmitting means for transmitting a search signal including a code,
When the transmitter receives a search signal including a registration request command from the receiver, the transmitter has a storage means for storing an ID code unique to the receiver included in the search signal.

[0008]

As described above, according to the present invention as set forth in claim 1, the transmitter is from the receiver to the receiver-specific I
When a search signal including a D code is received, it is determined whether the ID code unique to this receiver and the ID code unique to the partner receiver registered in advance are matched. Since the transmission signal including the ID code unique to the transmitter is transmitted, it is possible to prevent interference of radio waves transmitted from the transmitter.

According to the second aspect of the present invention, the receiver transmits a search signal including a registration request command and an ID code unique to the receiver when newly registering the transmitter. When the transmitter receives the search signal including the registration request command from the receiver, the transmitter stores the ID code unique to the receiver by storing the ID code unique to the receiver included in the search signal. Since it is memorized in the transmitter, the transmitter can transmit the electric wave for responding only to the search signal from the specific receiver,
It is possible to prevent interference of radio waves transmitted from the transmitter.

[0010]

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 battery power source 11 for supplying power to equipment of an electric system provided in the vehicle and a search signal for searching the transmitter 2. Circuit 1 for generating radio waves having
2, and a receiving circuit 13 for receiving a radio wave including a unique ID code signal transmitted from a transmitter 2 carried by the driver,
A lock / unlock detection switch 14 for detecting whether the vehicle door is in a locked state or an unlocked state, and an input circuit 15 for inputting the locked state of the lock / unlock detection switch 14 and outputting the lock state to the microcomputer 16. Microcomputer 1 for determining whether or not the ID code signal from the transmitter 2 received via the receiving circuit 13 matches a specific code
6 and an output circuit 17 for outputting a door lock signal or a door unlock signal to a door actuator built in a vehicle door when the two codes match as a result of judgment by the microcomputer 16, and radio waves around the vehicle are collected. Antenna 1
8. An ID code storage circuit 19 having an E2 PROM for storing a unique ID code, and an antenna (not shown) attached to a vehicle for emitting a radio wave including a search signal from the transmission circuit 13. . The input circuit 15
Is output 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, the transmitter 2 carried by a normal driver is a battery power source 21 for supplying power.
A receiver circuit 22 for receiving a search signal for searching the transmitter 2 generated from the receiver 1, and a receiver circuit 22.
A transmission circuit 23 for transmitting a radio wave having a predetermined ID code in response to the reception of a search signal in the above, and an ID code storage circuit 24 for storing a unique ID code having an E2 PROM
And a microcomputer 25 for comparing the ID code of the receiver 1 included in the search signal received by the receiving circuit 22 with the ID code stored in advance in the ID code storage circuit 24. The receiving circuit 22 and the transmitting circuit 23
Each has a small antenna (not shown) attached thereto.

Next, the operation of the keyless entry device will be described with reference to FIGS. The ID code storage circuit 19 of the receiver 1 provided on the vehicle side is provided with the receiver 1
It is assumed that the ID code of the transmitter 2 used as a set is stored. Further, the ID code storage circuit 24 of the transmitter 2 is supposed to store the ID code of the receiver 1 used as a set with the transmitter 2.

First, as shown in FIG. 3A, the receiver 1 provided on the vehicle side transmits a search signal including an ID code of the receiver 1 together with a transmission request command indicating a transmission request to the transmitter. generate. When the transmitter 2 receives this search signal, the microcomputer 25 determines whether the ID code stored in the ID code storage circuit 24 in advance matches the ID code from the receiver included in the search signal. Here, when the ID codes of both are matched, FIG.
As shown in, the microcomputer 25 generates a transmission signal including the ID code of the transmitter 2 via the transmission circuit 23 together with an operation request command indicating unlocking of the vehicle door.

Next, when the receiver 1 receives the transmission signal from the transmitter 2, the ID code is similarly verified.
That is, I stored in the ID code storage circuit 19 in advance
The microcomputer 16 determines whether the D code matches the ID code included in the transmission signal from the transmitter 2. Here, when both match, the lock / unlock detection switch 1
4, the transmitter enters the communication area, the transmitter exits the communication area, etc., and the output circuit 17 outputs the door lock output or the unlock signal according to the state of the determination result. The lock output is output to the vehicle door actuator (not shown).

Next, referring to FIG. 2, two transmitters T-1,
The manner of locking and unlocking the vehicle according to the position of T-2 will be described. It is assumed that the receiver R-1 is constantly generating the search signal. (1) When the transmitters T-1 and T-2 are not present in the communication area (a), the transmitter T-1 and T-2 do not transmit the transmission signal even if the vehicle outputs the search signal. The vehicle holds the vehicle door locked. (2) When the transmitter T-1 enters into the communication area (a) and the search signal is output from the vehicle, the transmitter T-
Since the transmission signal is transmitted from 1, the vehicle changes the vehicle door from the locked state to the unlocked state.

(3) Furthermore, when the transmitter T-2 enters the communication area (a), the transmission signal is transmitted only from the transmitter T-1 even if the search signal is output from the vehicle. The vehicle holds the unlocked state of the vehicle door. (4) Here, from within the communication area (a), the transmitter T-1
If the search signal is output, the transmission signal is not transmitted from the transmitter T-2 even if the search signal is output from the vehicle, so that the vehicle sets the vehicle door from the unlocked state to the locked state. (5) Further, from within the communication area (a), the transmitter T-2
If the output signal is out, the transmission signal is not received by the vehicle even if the search signal is output from the vehicle, so the vehicle holds the vehicle door in the locked state.

Therefore, when the receiver R-1 generates a search signal, the transmitter T-1 stores the ID code of R-1, so that when the transmitter T-1 receives this search signal. Is the ID code stored in the ID code storage circuit 24 in advance and the ID from the receiver included in the search signal.
If the microcomputer 25 determines that the code matches, and if the two match as a result of the determination, the transmitter T-1 can transmit a transmission signal including its own ID code. However, the transmitter T-2 of another user cannot generate a transmission signal because the ID codes do not match. As a result, even if there is a transmitter used by another user in the communication area, it is possible to prevent the conventional interference of the transmission signal.

As described above, when the transmitter 2 receives the search signal including the ID code unique to the receiver 1 from the receiver 1, the ID code unique to the receiver 1 and the reception of the other party registered in advance are received. The microcomputer 25 determines whether the ID code unique to the transmitter 1 matches, and when the two match as a result of the determination, a transmission signal including the ID code unique to the transmitter 2 is transmitted. It is possible to prevent interference of radio waves transmitted from a plurality of transmitters 1 having different numbers.

(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. As shown in the figure,
The keyless entry device is characterized by an external SW2 for causing the receiver 1 to shift the operation mode of the receiver to the registration mode.
0 is set.

Here, the operation when the ID code of the transmitter 2 is newly registered in the receiver 1 will be described.

For example, when the user loses the transmitter 2 and newly uses another transmitter 2, between the receiver 1 provided on the vehicle side and the new transmitter 2, It is necessary to register the unique ID codes of both parties.
In the present embodiment, registration is performed only in the registration mode regardless of whether the receiver 2 provided in the vehicle matches or does not match the ID code stored in advance. That is, the operation of storing the ID code of the receiver 1 in the new transmitter 2 side and storing the ID code of the new transmitter 2 in the receiver 1 is automatically performed.

Next, an ID code registration process in the keyless entry device will be described with reference to FIGS. 3 and 5. First,
New transmitter 2 to be registered in the vehicle compartment or communication area
Shall be placed. At step J10, when the user presses the external SW 20 of the receiver 1 to set the registration mode,
The microcomputer 16 shifts the internal processing to the registration mode. Next, in step J20, the search signal output from the receiver 1 is replaced with the normal transmission request command in FIG.
It switches to the registration request command shown in (c).

On the other hand, the new transmitter 2 operates in step S10.
Then, when a search signal having a registration request command output from the receiver 1 is received, instead of the collation of the ID code on the vehicle side which is normally performed, the R code which is the ID code of the vehicle in the search signal is received. -1 is stored in the ID code storage circuit 24 as a new ID code. Next, in step S20, as shown in FIG. 3D, the transmitter 2 transmits its own ID code T-1 together with the registration request command. Next, when the receiver 1 receives this registration request command in step J30, the receiver 1 automatically adds a new transmitter 2
I as the new ID code, which is T-1 which is the ID code of
It is stored in the D code storage circuit 19.

Therefore, in the registration mode, the ID code of the receiver 1 and the ID code of the transmitter 2, which are provided on the vehicle side, are not collated with each other, and the ID codes of the two are automatically stored and newly stored. Even when the transmitter 2 is prepared and set in the above, the registration work can be easily performed, which can contribute to simplification of the registration work.

In this way, the receiver 1 is newly added to the transmitter 1.
When a search signal including a registration request command and an ID code unique to the receiver 1 is transmitted, the transmitter 2 receives a search signal including the registration request command from the receiver 1 By storing the ID code unique to the receiver 1 included in the search signal in the ID code storage circuit 24, the ID code unique to the receiver 1 is stored in the transmitter 2. Can transmit a radio wave for responding only to a search signal from a specific receiver 1, and can prevent interference of radio waves transmitted from the transmitter 2.

[Brief description of 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 how a vehicle is locked and unlocked using two transmitters A and B.

FIG. 3 is a diagram showing configurations of a search signal and a transmission signal of the keyless entry device according to the first and second embodiments of the present invention.

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 flowchart for explaining ID code registration processing by the keyless entry device.

FIG. 6 is a diagram showing a configuration of a conventional keyless entry device.

FIG. 7 is a diagram for explaining the operation of a conventional keyless entry device.

[Explanation of symbols]

 1 receiver 2 transmitter 11 vehicle battery power supply 12 transmission circuit 13 reception circuit 14 lock / unlock detection switch 16 microcomputer 18 antenna 19 ID code storage circuit 20 registration mode switch SW 21 battery power supply 22 reception circuit 23 transmission circuit 25 microcomputer

Claims (2)

[Claims] 1. A vehicle door is unlocked when a portable transmitter enters a communication area within a predetermined distance from a receiver provided in a vehicle, and when the transmitter leaves the communication area. Is a keyless entry device for locking a vehicle door, wherein, when the transmitter receives a search signal including an ID code unique to the receiver, the transmitter is previously registered with the ID code unique to the receiver. It has a discriminating means for discriminating a match with the ID code peculiar to the receiver, and a transmitting means for transmitting a transmission signal containing the ID code peculiar to the transmitter when the both discriminate as a result of the discrimination. Characteristic keyless entry device. 2. The vehicle door is unlocked when a portable transmitter enters a communication area within a predetermined distance from a receiver provided on the vehicle, and when the transmitter leaves the communication area. Is a keyless entry device for locking a vehicle door, wherein the receiver has a transmitting means for transmitting a search signal including a registration request command and an ID code unique to the receiver when the transmitter is newly registered. On the other hand, when the transmitter receives the search signal including the registration request command from the receiver, the ID unique to the receiver included in the search signal.
A keyless entry device having a storage means for storing a code.