JP2000125365A - Keyless entry system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyless entry system that decreases a time until a driver is in operation, after an electronic key is deppressed. SOLUTION: A receiver 20 has an antenna 21 that receives a signal from an electron key 10, a high-frequency circuit 22 that analyzes the signal, a storage section 23 that stores its own vehicle code RD, and a control section 24 that compares and discriminates an identification code ID and its own vehicle code RD. A controller 30 has a control section 31 that receives a signal from the receiver 20, an oscillation section 32 that operates the control section 31, and a drive section 33 that outputs a drive current DS for driving the driver 40 such as a door lock motor with a control signal CS from the control section 31. A control section 24 outputs a start signal SS to the control section 31, when receiving a head part of the identification code ID to operate the driver 40 in a sum of times tt and td after the electronic key 10 is depressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyless entry system mounted on a vehicle, and more particularly to a technique for shortening the time from when an electronic key is pressed to when a drive device operates.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open Nos. 8-289372 and 10-173567 disclose a wireless keyless entry system using weak radio waves used for vehicles.

[0003] When an identification code output from an electronic key carried by a user of a vehicle such as a driver is received by a receiving device provided in a vehicle cabin and determined to be an own vehicle code,
A signal is output to a control device connected to the receiving device, and in response to the signal, the control device outputs a signal to drive a door lock motor, thereby performing predetermined control such as opening and closing operation of a door lock. .

In such a system, the receiving apparatus operates in an intermittent receiving mode in which a receiving ON state and a receiving OFF state are repeated in order to suppress consumption of a battery during standby by a high-frequency circuit or a built-in electric circuit such as a control unit (CPU). Waiting for the identification code, a trigger code requiring a longer reception time than the reception off state is added to the head of the identification code.

Therefore, even if the electronic key is pressed at any time during the mode time, a part of the trigger code always goes into the reception ON state, and after receiving this trigger code, the receiving apparatus maintains the reception ON state and triggers. An identification code following the code is received.

[0006] The receiving device receives the entire identification code in the control unit, compares it with the vehicle code, and when both codes match, sends a start signal to the control device to reduce the battery consumption. The control unit (CPU) of the control device in the (sleep mode) is activated to the normal mode.

After receiving the start signal, the control unit of the control unit waits for a stabilization time of the built-in oscillation unit (crystal), and then outputs a drive current to the door lock motor.

[0008]

In such prior art,
A stable time is required until the control unit of the control device receives a start signal and outputs a drive current to a drive device such as a door lock motor, and therefore, a time from when an electronic key is pressed to when the drive device is actually driven. And it has been desired to reduce this.

[0009]

According to the present invention, there is provided a keyless entry system comprising:
As described in the above, an electronic key for transmitting a signal including at least a unique identification code is compared with the identification code and the own vehicle code stored in the storage unit, and when the two codes match, a predetermined value is determined. And a control device having a control unit that is normally in a sleep mode for operating a desired driving device in response to the signal from the receiving device, and the receiving device is configured to include the electronic device. When a part of the signal from the key is received, a start signal for starting the control unit of the control device to the normal mode is output. In particular, after the control unit of the control device starts up to the normal mode by the start signal, if the function signal is not transmitted from the receiving device even after a lapse of a fixed time, the control unit of the control device is again in the sleep mode. (Claim 3). Further, the signal from the electronic key is transmitted by a radio wave using a weak radio wave, and the receiving device has an antenna for receiving the signal and a high frequency circuit, and has a reception ON state and a reception OFF state. Are driven in an intermittent reception mode in which the above is repeated (claim 4).

The electronic key for transmitting a signal including at least a unique identification code is compared with the vehicle code stored in a storage unit. A receiving device that outputs a predetermined signal when both codes match, and a control device that has a control unit that is normally in a sleep mode for operating a desired driving device according to the signal from the receiving device Become
The receiving device outputs an activation signal for activating the control unit of the control device to a normal mode when the head of the identification code is received from the electronic key. In particular, after the control unit of the control device starts up to the normal mode by the start signal, if the function signal is not transmitted from the receiving device even after a certain time elapses, the control unit of the control device is again in the sleep mode. (Claim 3). Further, the signal from the electronic key is transmitted by a radio wave using a weak radio wave, and the receiving device has an antenna for receiving the signal and a high-frequency circuit, and a reception on state and a reception off state. Are driven in an intermittent reception mode in which the above is repeated (claim 4).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic key for transmitting a signal containing at least a unique identification code is compared with the identification code and a vehicle code stored in a storage unit. A receiving device that outputs a predetermined signal, and a control device having a control unit that is normally in a sleep mode for operating a desired driving device in accordance with the signal from the receiving device, and the receiving device is Upon receiving a part of the signal from the electronic key, it outputs a start signal for starting the control unit of the control device to the normal mode. More specifically, at least a unique identification code ID is included. Key 10 for transmitting a signal to be transmitted
And a reception device 20 that compares the identification code ID with the vehicle code RD stored in the storage unit 23 and outputs an activation signal SS when both the code ID and RD match, and A control unit 30 having a control unit 31 which is normally in a sleep mode for operating a desired drive unit 40 in response to the start signal SS.
0 outputs an activation signal SS for activating the control unit 31 of the control device 30 to the normal mode when the head of the identification code ID from the electronic key 10 is received.

Thus, the time from when the electronic key 10 is pressed to when the driving device 40 such as a door lock motor actually operates can be shortened.

In particular, if the control unit 31 of the control device 30 does not transmit a function signal from the receiving device 20 even after a certain period of time has elapsed after the control unit 31 has been activated to the normal mode by the activation signal SS, the control unit 31 of the control device 30 will be described. Returns to sleep mode again.

Thus, the power consumption (battery consumption) of the control device 30 can be suppressed.

The signal from the electronic key 10 is transmitted by a radio wave using a weak radio wave. The receiving device 20 has an antenna 21 for receiving the signal and a high frequency circuit 22.

In such a radio keyless entry system, the power consumption by the electric circuit such as the high frequency circuit 22 is large.
The drive is performed in an intermittent reception mode in which the reception on state t1 and the reception off state t2 are repeated. In such a configuration, the reception off time t2 is longer than the reception on state t1.
Therefore, the signal from the electronic key 10 includes the ID code I
A trigger code TD is added to the head of D, and an ID code I
Although it takes time to receive and confirm D, the electronic key 10 is depressed by outputting a start signal SS for starting the control unit 31 of the control device 30 to the normal mode when a part of the signal is received. It is possible to reduce the time from when the operation is performed to when the driving device 40 such as the door lock motor actually operates.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the embodiments shown in the accompanying drawings.

FIGS. 1 and 2 relate to an embodiment of the present invention.
0 is an electronic key carried by a vehicle user such as a driver, 20
Is a receiving device that receives a signal from the electronic key 10, 30 is a control device that is controlled according to a signal from the receiving device 20,
Reference numeral 40 denotes a drive unit that drives according to a signal from the control device 30.

The electronic key 10 transmits a unique identification code ID and a trigger code TS added to the head thereof by a switch operation.

The receiving device 20 includes an antenna 21 for receiving a signal from the electronic key 10, a high-frequency circuit 22 for analyzing a signal from the antenna 21, a storage unit 23 for storing a vehicle code RD, and a high-frequency circuit 22. Identification code I from
The control unit 24 includes a CPU and the like for comparing and determining D with the own vehicle code RD. The control device 20 waits for a trigger code TS in an intermittent reception mode in which a reception ON state t1 and a reception OFF state t2 are repeated in order to suppress battery consumption during standby, and after receiving this trigger code TS, the reception device 20 receives the identification code ID following the trigger code TS while maintaining the reception ON state t3, and the reception ON state t3 ends when all the identification code IDs are received. And when both code ID and RD match,
The control unit 24 outputs an activation signal SS to the control device 30.

The control device 30 can control various parts of the vehicle such as meter processing, but only the parts related to the keyless processing are shown in the drawing. That is, a control unit 31 including a CPU or the like for inputting a signal from the receiving unit 20, an oscillation unit 32 including a crystal for operating the control unit 31, a door lock motor or the like based on a control signal CS from the control unit 31. And a driving unit 33 that outputs a driving current DS in order to drive the driving device 40.
The control device 30 is normally in a standby state (sleep mode) in which the function is stopped in order to suppress battery consumption.

Next, a specific operation of the keyless entry system will be described.

The control unit 21 and the control device 30 of the receiving device 20
The control unit 31 is in a sleep mode in order to suppress battery consumption during standby when the vehicle is not used or the like, and the former is in an intermittent reception mode in which the reception on state t1 and the reception off state t2 are repeated.

After receiving the trigger code TS requiring the reception time tt longer than the reception off state time t2 from the electronic key 10, the receiving apparatus 20 maintains the reception on state t3 and identifies the identification code following the trigger code TS. The reception of the code ID is completed, and the reception ON state t3 ends with or after the reception time td of the identification code ID.

The control unit 21 of the receiver 20 receives the identification code ID and the own vehicle code R stored in the storage unit 23.
Before confirming that D matches, the identification code ID
At the time when the first part of the control unit 30 is received,
1 to output a start signal SS.

As a result, the control unit 31 starts up when the control unit 24 receives the first part of the identification code ID, enters the normal mode, and sets a stable time of the oscillation unit 32 at the time td when the identification code ID is received. t4 is shared.

That is, the reception time td of the identification code ID
On the other hand, the stabilization time t4 of the oscillation unit 32 is sufficiently short, and the control unit 31 is in a stable state while receiving the identification code ID, and absorbs the stabilization time t4 at the reception time td.

If the two codes ID and RD do not match in comparison with the own vehicle code RD performed after the completion of the reception of the identification code ID, the control unit 24 determines that the electronic key 10 is incorrect and sends the control device 30 a Does not output any signal, and if no function signal (lock signal RS or unlock signal US) is transmitted from the receiving device 20 even after a certain period of time, the control unit 31 returns to the sleep mode again.

If both codes ID and RD match,
The control unit 24 sends a lock signal R to the control unit 31 of the control device 30.
S or unlock signal US is output. These two signals R
S and US have the same content but are actually one function signal, but the control device 30 recognizes either the lock signal RS or the unlock signal US depending on the vehicle state when the electronic key 10 is pressed. Then, when the lock signal RS or the unlock signal US is input, the control unit 31 outputs the control signal CS to the drive unit 33, and outputs the drive current DS to the control device 40 in response thereto.

Therefore, the driving device 40 can be operated in the total time of the time tt and the time td after the electronic key 10 is pressed.

On the other hand, in the prior art, as shown in FIG. 3, the activation signal SS is output after the lapse of the total time of the time tt and the time td, and the lock signal RS or the unlock signal is finally waited for the stable time t4. Upon receiving the lock signal US, the control unit 31 outputs a control signal CS to the drive unit 33 and outputs a drive current DS to the control device 40 in response to the lock signal US.

That is, in the above-described embodiment, the driving device 40 can be operated in a shorter time than the prior art by the stabilization time t4 (generally, several tens of milliseconds). The time from the pressing until the driving device 40 is actually driven is reduced.

In the above-described embodiment, a radio keyless entry system has been described as an example. However, it is needless to say that the invention can be similarly applied to an infrared radio keyless entry system.

The timing at which the control unit 31 of the control device 30 starts up in the normal mode is determined by the control unit 2 of the reception device 20.
4, when the first part of the trigger code TS is received,
It is possible to set the time when a part of the signal from the electronic key 10 is received.

[0035]

According to the present invention, the control unit of the receiving device outputs an activation signal to the control unit of the control device when the first part of the identification code is received, so that the electronic key is pressed. The desired driving device can be operated by the total time of the trigger code receiving time and the ID code receiving time, and the driving device can be operated in a shorter time than the conventional technology, which is convenient for the user. Can be enhanced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating the configuration of an embodiment of the present invention.

FIG. 2 is a time series diagram for explaining an operation method of the embodiment.

FIG. 3 is a time series diagram for explaining a conventional operation method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electronic key 20 Receiving device 21 Antenna 22 High frequency circuit 23 Storage unit 24 Control unit 30 Control device 31 Control unit 32 Oscillating unit 33 Drive unit 40 Drive device ID identification code TS Trigger code RD Own vehicle code SS Start signal CS Control signal DS Drive Current RS Lock signal US Unlock signal t1, t3 Reception ON state t2 Reception OFF state t4 Stabilization time tt Trigger code reception time td Identification code reception time

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryuichi Ando 1-1190-1, Fujibashi, Nagaoka-shi, Niigata Japan F-term in R & D Center Japan Seiki Co., Ltd. 2E250 AA21 BB21 BB35 HH01 JJ03 5K048 AA08 BA42 BA52 DB01 DC01 EA16 EB02 FA07 HA04 HA06 HA36

Claims (4)

[Claims] 1. An electronic key for transmitting a signal including at least a unique identification code, and the identification code and a vehicle code stored in a storage unit are compared. A receiving device that outputs a signal, and a control device having a control unit that is normally in a sleep mode for operating a desired driving device in accordance with the signal from the receiving device. A start signal for starting a control unit of the control device to a normal mode when a part of the signal is received from the keyless entry system. 2. An electronic key for transmitting a signal including at least a unique identification code, and the identification code and a vehicle code stored in a storage unit are compared with each other. A receiving device that outputs a signal, and a control device having a control unit that is normally in a sleep mode for operating a desired driving device in accordance with the signal from the receiving device. A start signal for starting the control unit of the control device to the normal mode when the head portion of the identification code is received from the keyless entry system. 3. After the control unit of the control device starts up to the normal mode by the start signal, if a function signal is not transmitted from the receiving device even after a certain period of time, the control unit of the control device The keyless entry system according to claim 1, wherein the keyless entry system returns to the sleep mode again. 4. The signal from the electronic key is transmitted by a radio wave using a weak radio wave, and the receiving device has an antenna for receiving the signal and a high-frequency circuit, and a reception ON state. The keyless entry system according to claim 1, wherein the keyless entry system is driven in an intermittent reception mode in which a reception off state is repeated.