KR100794764B1 - Passive entry system, and method of wake-up and trigger thereof - Google Patents

Abstract

A passive entry system of the present invention and a wake-up and trigger method thereof, the second microcontroller of the smart electronic control unit (ECU) only when a wake-up / trigger signal is received from the smart key. Is wake-up to prevent battery discharge and reduce power consumption of the vehicle, and can only be triggered by a smart key without a separate trigger device such as a door handle switch. . In addition, since the smart key operates only when the movement of the smart key is detected by the motion sensor installed inside the smart key, power consumption of the battery can be reduced.

Wake up and trigger method of the passive entry system of the present invention for this purpose, (a) transmitting the wake up (Take up) and trigger (Trigger) signal in the smart key; (b) a second microcontroller of the smart electronic control unit (ECU) wakes up in a sleep state by the wake up signal and confirms a first ID of the smart key by a trigger signal; (c) when the first ID of the smart key is authenticated, the smart electronic control unit (ECU) transmits a second ID request signal to the smart key through a low frequency transmitter; otherwise, the smart electronic controller Bringing (ECU) back to sleep; (d) when the smart key receives the second ID request signal through a low frequency receiver, transmitting second ID information to the smart electronic control unit (ECU) through a high frequency transmitter; And (e) receiving and decrypting the second ID information through a high frequency receiver in the smart electronic control unit (ECU) to perform an authentication procedure and then perform a door lock / open, engine start, and anti-theft function. It includes.

Vehicle, remote start, smart key, passive entry, smart electronic control unit (ECU), power consumption, trigger, wake up

Description

Passive ENTRY SYSTEM, AND METHOD OF WAKE-UP AND TRIGGER THEREOF

1 is a block diagram of a passive entry system according to the prior art.

2 is a block diagram of a passive entry system according to a first preferred embodiment of the present invention.

3A to 3C are flowcharts illustrating operations of a wake up and trigger method of the passive entry system shown in FIG.

4 is a block diagram of a passive entry system according to a second preferred embodiment of the present invention.

FIG. 5 is a flowchart illustrating a wake up and trigger method of the smart key shown in FIG.

<Explanation of symbols for the main parts of the drawings>

100: smart key 110: the first microcontroller

120: high frequency transmission unit 130: high frequency transmission antenna

140: 3-axis low frequency receiving antenna

141: first low frequency receiving antenna

142: second low frequency receiving antenna

143: third low frequency receiving antenna

150: low frequency receiving unit 160: power supply unit

200: Smart Electronic Control Unit (ECU)

210: high frequency transmission antenna 220: high frequency receiving unit

230: second microcontroller 240: low frequency transmission unit

250: low frequency transmission antenna

300: smart key 310: the first microcontroller

320: high frequency transmission unit 330: high frequency transmission antenna

340: 3-axis low frequency receiving antenna

341: first low frequency receiving antenna

342: second low frequency receiving antenna

343: third low frequency receiving antenna

350: low frequency receiving unit 360: power supply unit

370: motion sensor

400: Smart Electronic Control Unit (ECU)

410: high frequency transmission antenna 420: high frequency receiving unit

430: second microcontroller 440: low frequency transmission unit

450: low frequency transmission antenna

The present invention relates to a passive entry system and a wake-up and trigger method thereof, in particular by means of a wake-up signal from a smart key. After the Electronic Control Unit (ECU) wakes up from the Sleep state to the Active state, the electronic control unit ECU sends an authentication request signal Request by the trigger signal of the smart key. The present invention relates to a passive entry system and a wake-up and triggering method thereof, which can be prevented from discharging the battery of a vehicle by sending to a smart key.

It also relates to a passive entry system capable of being triggered only by a smart key and its wake-up and triggering method without a separate trigger device such as a door handle switch.

In addition, a passive entry system and its wake-up capable of minimizing power consumption of the smart key, that is, battery power, by allowing the smart key to operate only when the movement of the smart key is detected by the motion sensor installed inside the smart key. And a trigger method.

In general, the passive entry system is a system in which the driver remotely controls the operation of the vehicle, such as starting the engine or locking / opening the door using a wireless signal, and includes a smart key carried by the driver and a smart mounted on the vehicle. It consists of an electronic control unit (ECU). At this time, the smart key is the engine starting function, the door only when the encryption code is matched by automatic wireless communication with the smart electronic control unit (ECU) of the vehicle without any action such as key insertion or button pressing within a certain distance. Lock / open, anti-theft, etc. Hereinafter, a conventional passive entry system will be described with reference to FIG. 1.

1 is a block diagram of a passive entry system according to the prior art.

The conventional passive entry system is composed of a smart key 10 and a smart electronic control unit (ECU) 20, as shown in FIG. Here, the smart key 10 is a three-axis low frequency reception consisting of a microcontroller 11, a high frequency transmission unit 12, a high frequency transmission antenna 13, and the first to third low frequency reception antennas 14a to 14c. The antenna 14, the low frequency receiving unit 15, the power supply unit 16, the smart electronic control unit (ECU) 20 is a high frequency receiving antenna 21, a high frequency receiving unit 22, a microcontroller 23 And a low frequency transmission unit 24, a low frequency transmission antenna 25, a door handle switch, a trigger switch 26 such as a trunk switch, and a switch power supply unit 27.

In the conventional passive entry system having the above configuration, when the smart key 10 and the smart electronic control unit (ECU) 20 press the trigger switch 26 such as the door handle switch within a frequency reception range, the smart key 10 The trigger signal ① is sent to the ECU 20. By the trigger signal, the microcontroller 23 of the smart electronic control unit (ECU) 20 performs smart key authentication with the smart key 10 through the low frequency transmission antenna 25 via the low frequency transmission unit 24. Transmits a request signal (2) for.

The low frequency receiving unit 15 of the smart key 10 receives the request signal ② transmitted from the smart electronic control unit (ECU) 20 through the 3-axis low frequency receiving antenna 14 to receive a microcontroller. Transfer to (11). The microcontroller 11 decrypts the request signal ② and transmits an encrypted response signal ③ through the high frequency transmitter 12.

The high frequency receiver 22 of the smart electronic control unit (ECU) 20 receives the response signal ③ transmitted from the smart key 10 and transmits the response signal ③ to the microcontroller 23. The microcontroller 23 decodes the response signal ③, performs an authentication procedure, and then performs an engine start function, a door lock / open function, an anti-theft function, and the like.

The microcontroller 23 of the smart ECU 20 sends a request signal through the low frequency transmitter 24 at the moment of holding the smart key 10 and pressing a trigger switch 26 such as a driver's seat or a passenger's door handle switch. The smart key 10 receiving the request signal transmits a response signal such as an ID to the smart ECU 20 through the high frequency transmitter 12. In addition, when the response signal is read and authenticated, the smart ECU 20 performs an action of opening / locking the door and starting the engine.

However, the conventional passive entry system having the above configuration requires a separate trigger switch device such as a door handle switch and a trunk switch. In addition, in order to operate without a separate trigger device in the conventional passive entry system, the electronic controller 20 is always active in order to continuously transmit a request signal through the low frequency transmitter 24 of the smart electronic controller 20. Since it needs to maintain the (Active) state, it consumes a lot of current.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a second control unit of the smart electronic control unit (ECU) only when a wake-up / trigger signal is received from the smart key. The present invention provides a passive entry system and a wake-up and trigger method thereof in which a microcontroller wakes up and operates, thereby preventing a vehicle from discharging a battery and reducing power consumption.

Another object of the present invention is to provide a passive entry system and a wake-up and trigger method thereof which can be triggered only by a smart key without a separate trigger device such as a door handle switch.

In addition, another object of the present invention is to activate the smart key only when the movement of the smart key is detected by the motion sensor installed inside the smart key, the passive entry system and its wake-up and trigger that reduces the power consumption of the battery To provide a way.

Wake up and trigger method of a passive entry system according to the present invention for achieving the above object comprises the steps of (a) transmitting a wake up (Trigger) signal in the smart key; (b) a second microcontroller of the smart electronic control unit (ECU) wakes up in a sleep state by the wake up signal and confirms a first ID of the smart key by a trigger signal; (c) when the first ID of the smart key is authenticated, the smart electronic control unit (ECU) transmits a second ID request signal to the smart key through a low frequency transmitter; otherwise, the smart electronic controller Bringing (ECU) back to sleep; (d) when the smart key receives the second ID request signal through a low frequency receiver, transmitting second ID information to the smart electronic control unit (ECU) through a high frequency transmitter; And (e) receiving and decrypting the second ID information through a high frequency receiver in the smart electronic control unit (ECU) to perform an authentication procedure and then perform a door lock / open, engine start, and anti-theft function. It includes.

In the wake-up and trigger method of the passive entry system, the signal transmission from the smart key to the smart electronic control unit (ECU) is transmitted using high frequency, and the signal is transmitted from the smart electronic control unit (ECU) to the smart key. Is transmitted using a low frequency, but is preferably transmitted using a magnetic induction coupling method.

The wake-up and trigger method of the passive entry system may include (a1) making the first microcontroller, the high frequency transmitter, and the low frequency receiver of the smart key sleep, and detecting the movement of the smart key during initial operation. Making only the motion sensor active; (a2) when the motion signal is detected by the motion sensor, the first microcontroller wakes up to make the high frequency transmitter and the low frequency receiver active; (a3) transmitting, by the first microcontroller, the wake up / trigger signal to the smart electronic control unit (ECU) via a high frequency antenna via the high frequency transmitter; And (a4) returning to the step (a1) if the movement stop time of the smart key is longer than a preset time.

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In addition, the passive entry system of the ball invention for achieving the above object is composed of a smart key and a smart electronic control unit (ECU), the smart key is a smart electronic control device by the wake-up / trigger signal by a high frequency transmission antenna A high frequency transmitter to transmit to the; A low frequency receiver for receiving a request signal for smart key authentication from the smart electronic controller as the smart key through a low frequency reception antenna according to the wake up / trigger signal; A first control to transmit the wake up / trigger signal to the high frequency transmitter, and to decrypt the request signal for the smart key authentication received through the low frequency receiver to transmit an encrypted response signal to the high frequency transmitter; Microcontroller; A power supply unit supplying necessary power; The smart electronic control device includes a high frequency receiver configured to receive the wake up / trigger signal and the response signal from the high frequency transmitter of the smart key, respectively; A low frequency transmitter for transmitting a request signal for the smart key authentication to the smart key through a low frequency transmission antenna; Control to receive the wake up / trigger signal received through the high frequency receiver, control to transmit the request signal for the smart key authentication through the low frequency transmitter, and control to receive the response signal through the high frequency receiver A second microcontroller configured to decrypt the encrypted response signal to perform an authentication procedure; A power supply unit supplying necessary power; It includes.

The smart key further includes a motion sensor for detecting a movement of the smart key, wherein the first microcontroller wakes up or sleeps the smart key by a motion signal detected by the motion sensor. Controlling to make the mode state.

The motion sensor is preferably any one of a displacement sensor and an acceleration sensor.

The low frequency reception antenna is preferably composed of three antennas in three axes.

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Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First embodiment

2 is a block diagram of a passive entry system according to a first embodiment of the present invention.

As shown in FIG. 2, the passive entry system according to the first embodiment of the present invention includes a smart key 100 and a smart electronic control unit (ECU) 200. Here, the smart key 100 is a three-axis low frequency consisting of a first microcontroller 110, a high frequency transmitter 120, a high frequency transmission antenna 130, the first to third low frequency reception antennas (141a to 141c). The receiving antenna 140, the low frequency receiving unit 150, and the power supply unit 160, the smart electronic control unit (ECU) 200 is a high frequency receiving antenna 210, a high frequency receiving unit 220, the second micro The controller 230, the low frequency transmitter 240, the low frequency transmission antenna 250, and the power supply unit 260 are configured.

First, the smart key 100 receives a request signal ② by transmitting a wake up / trigger signal ① to the smart electronic control unit (ECU) 200 and receives the request signal ②. After decrypting (②), the encrypted response signal ③ is transmitted.

To this end, the first microcontroller 110 transmits the wake up / trigger signal ① to the high frequency transmitter 120, and a request signal ② for smart key authentication through the low frequency receiver 150. After receiving and decrypting the transmission, the encrypted response signal is transmitted to the high frequency transmission unit 120 and transmitted to the smart electronic control unit (ECU) 200 through the high frequency transmission antenna 130.

The high frequency transmitter 120 transmits the wake up / trigger signal ① and the response signal ③ to the smart electronic control unit (ECU) 200 through the high frequency transmission antenna 130.

The high frequency transmission antenna 130 transmits a signal received from the high frequency transmission unit 120 and has, for example, a 433 MHz or 315 MHz frequency band.

The triaxial low frequency reception antenna 140 includes first to third low frequency reception antennas 141a to 141c including three antennas in three axes to receive signals in all directions. The triaxial low frequency reception antenna 140 has, for example, a low frequency band of 100 kHz to 300 kHz.

The low frequency receiver 150 receives the request signal ② transmitted from the smart electronic control unit (ECU) 200 through the triaxial low frequency reception antenna 140 and the first microcontroller 110. To send).

The power supply unit 160 supplies power required for each component of the smart key 100.

Next, the smart electronic control unit (ECU) 200 wakes up the second microcontroller 230 in the sleep state when the wake up / trigger signal ① is received from the smart key 100. When a user wakes up and performs an authentication procedure for the ID of the smart key, the authentication signal is transmitted to the smart key 100 when the authentication is performed. When the response signal (③) is received from the smart key 100, the control unit decodes the response signal ③ to perform an authentication procedure, and then controls to perform a door lock / open, engine start, and theft prevention function. do.

To this end, the high frequency reception antenna 210 has the same frequency band as the high frequency transmission antenna 130 of the smart key 100, the wake transmitted from the high frequency transmission antenna 130 of the smart key 100. An up / trigger signal ① and the response signal ③ are received.

The high frequency receiver 220 receives the wake up / trigger signal ① and the response signal ③ transmitted from the high frequency transmitter 120 of the smart key 100 through the high frequency reception antenna 210. do.

The second microcontroller 230 wakes up from the sleep state by the wake up / trigger signal ① received through the high frequency receiver 220 and at the same time the ID of the smart key. If authentication is performed by performing an authentication procedure for the low frequency transmitter 240, the encrypted request signal ② is transmitted to the low frequency transmitter 240, and if not authenticated, the system returns to the sleep state, and the response signal ② is transmitted through the high frequency receiver 220. When received, the encrypted response signal ③ is decrypted to perform an authentication procedure and then control to perform a door lock / open, engine start, and theft prevention function.

The low frequency transmitter 240 transmits the request signal ② to the smart key 100 through the low frequency transmission antenna 250.

The power supply unit 260 supplies power required for each component of the smart electronic control unit (ECU) 200.

Accordingly, in the passive entry system having the above configuration, the second microcontroller 230 of the smart electronic control unit (ECU) wakes up only when a wake-up / trigger signal is received from the smart key. By operating up, the vehicle's battery can be prevented from discharging, reducing power consumption, and can be triggered only by smart keys without a separate trigger device such as a door handle switch. Since the smart key operates only when the movement of the smart key is detected by the motion sensor installed inside the smart key, power consumption of the battery can be reduced.

3A to 3C are flowcharts illustrating operations of a wake up and trigger method of the passive entry system illustrated in FIG. 2.

In the wake-up and trigger method of the passive entry system, as shown in FIG. 3, the smart key 100 is in a sleep state by the high frequency transmitter 120 in the smart key 100 at a predetermined time interval. The wake up / trigger signal is transmitted (step S110).

Then, the smart key 100 is located within the frequency reception range to determine whether the smart ECU 200 has received the wake up / trigger signal (step S120), and if the wake up / trigger signal has been received (step S120). In step S130, the process proceeds to step S130, and if the wake up / trigger signal is not received (NO in step S120), the process returns to the previous step S110.

Then, the second microcontroller 230 of the smart electronic control unit (ECU) 200 wakes up in a sleep state (step S130), and at the same time for the ID of the smart key. The authentication procedure is performed (step S140).

Then, if the ID of the smart key is authenticated (YES in step S150), the smart electronic control unit (ECU) 200 transmits a request signal ② to the smart key 100 (step S170). If not authenticated (NO in step S150), the second microcontroller 230 of the smart electronic control unit (ECU) 200 is brought back to sleep (step S160). Return to S110).

Next, the high frequency transmitter 120 receives an encrypted response signal ③ to be transmitted to the smart electronic control unit (ECU) 200 after receiving and decrypting the request signal ② from the smart key 100. Through the high frequency transmission antenna 130 is transmitted through (steps S180 to S190).

Next, the high frequency receiver 220 of the smart electronic control unit (ECU) 200 receives the response signal ③ transmitted from the smart key 100 (step S200), and receives the received response signal ( ③) is decrypted by the second microcontroller 230 (step S210) to perform an authentication procedure (step S220), and then performs a function of locking / opening the door, starting the engine, and preventing theft (step S230).

As described above, the passive entry system and the wake-up and trigger method thereof according to the present invention can be used only when a wake-up / trigger signal is received from the smart key 100. Since the second microcontroller 230 of FIG. 200 wakes up and operates, the phenomenon in which the battery of the vehicle is discharged may be prevented and the power consumption of the battery may be minimized.

Second embodiment

4 is a block diagram of a passive entry system according to a second preferred embodiment of the present invention.

As shown in FIG. 4, the passive entry system according to the second embodiment of the present invention includes a smart key 300 and a smart electronic control unit (ECU) 400. The smart key 300 is a three-axis low-frequency reception consisting of a first microcontroller 310, a high frequency transmitter 320, a high frequency transmission antenna 330, the first to third low frequency reception antennas 341 to 343. The antenna 340, the low frequency receiving unit 350, the power supply unit 360, the smart electronic control unit (ECU) 400 is a high frequency receiving antenna 410, a high frequency receiving unit 420, a second microcontroller ( 430, a low frequency transmitter 440, a low frequency transmission antenna 450, and a power supply unit 460.

Here, since the configuration and operation of the smart electronic control unit (ECU) 400 are identical to those of the smart electronic control unit (ECU) 200 in the first embodiment, detailed description thereof will be omitted herein. .

The smart key 300 wakes up in the sleep state of the first microcontroller 310 by the motion signal detected by the motion sensor 370 and the high frequency transmitter 320. The low frequency receiver 350 is activated to operate.

To this end, the first microcontroller 310 wakes up or changes to a sleep mode state by the motion signal detected by the motion sensor 370, and the high frequency signal during the wake-up. The transmitter 320 and the low frequency receiver 350 are in an active state, and in the sleep mode, the high frequency transmitter 320 and the low frequency receiver 350 are in a sleep state. The wake-up / trigger signal ① is transmitted to the 320 and the request signal ② transmitted from the smart electronic control unit (ECU) 400 through the low frequency receiver 350 is transmitted. It receives and decodes and transmits a response signal ③ through the high frequency transmitter 320. In addition, the microcontroller 310 displays received information including tire pressure information of the vehicle received from the smart electronic controller (ECU) 400 on the LCD panel.

The high frequency transmitter 320 transmits the wake up / trigger signal ① and the response signal ③ to the smart electronic control unit ECU 400 through the high frequency transmission antenna 330. The high frequency transmitter 320 may be activated or changed into a sleep state by the first microcontroller 310. That is, when the first microcontroller 310 is in the wake-up state, the first microcontroller 310 is in the active state, and when the first microcontroller 310 is in the sleep state, it is in the sleep state.

The high frequency transmission antenna 330 is an antenna for transmitting a high frequency signal, for example, may be composed of any one of the antenna having a frequency of 315MHz or 433MHz.

The triaxial low frequency antenna 340 is composed of three antennas in three axes (x, y, z axes) of the first to third low frequency antennas 341 to 343. The triaxial low frequency antenna 340 may have a frequency range of 100 to 300 kHz, for example.

The low frequency receiver 350 receives a signal transmitted from the smart electronic control unit (ECU) 400 through the triaxial low frequency antenna 340 and transmits the signal to the first microcontroller 310. The low frequency receiver 350 is activated or changed to a sleep state by the first microcontroller 310. That is, when the first microcontroller 310 is in the wake-up state, the first microcontroller 310 is in the active state, and when the first microcontroller 310 is in the sleep state, it is in the sleep state.

The power supply unit 360 supplies power required for each component of the smart key 300.

The motion sensor 370 is a sensor for detecting the movement of the smart key 300, and uses a sensor capable of detecting a motion, such as a displacement sensor and an acceleration sensor. The motion sensor 370 wakes up the first microcontroller 310 by transmitting a signal detecting the movement of the smart key 300 to the first microcontroller 310. The motion sensor 370 detects the movement of the smart key 300 by operating in an active state as well as an initial operation.

Therefore, in order to reduce power consumption of the battery, the smart key 300 has a sleep state in which the first microcontroller 310, the high frequency transmitter 320, and the low frequency receiver 350 are in a sleep state. The motion sensor 370 that detects the movement of the smart key 300 is programmed to be in an active state.

FIG. 5 is a flowchart illustrating a wake up and trigger method of the smart key 300 shown in FIG. 4.

As shown in FIG. 5, the wake up and trigger method of the smart key 300 may include a first microcontroller 310, a high frequency transmitter 320, and a low frequency receiver 350 of the smart key 300 during an initial operation. To make a sleep state and only the motion sensor 370 that detects the movement of the smart key 300 to be in an active state (step S300).

Next, when a motion signal is detected by the motion sensor 370 (steps S310 to S320), the first microcontroller 310 is made to wake up (step S130) and the high frequency transmitter 320 is activated. And make the low frequency receiver 350 active (step S340). Thereafter, all components of the smart key 300 are activated (step S350).

From the next step, the operation starts from step S100 of FIG. 3A.

As described above, the passive entry system and the wake-up and trigger method thereof according to the present invention can detect the movement of the smart key 300 only when the first microcontroller 310, the high frequency transmitter 320, and the low frequency receiver ( Since the normal operation of the 350 may minimize power consumption of the smart key, that is, the battery. In addition, the second microcontroller 430 of the smart electronic control unit 400 wakes up only when a wake-up / trigger signal is received from the smart key 300. It wakes up and prevents the vehicle's battery from discharging and minimizes battery power consumption.

The present invention is not limited to the above-described embodiments, and various modifications and changes can be made by those skilled in the art, which should be regarded as included in the spirit and scope of the present invention as defined in the appended claims. will be.

As described above, according to the passive entry system and the wake-up and trigger method thereof of the present invention, the smart electronic control unit (ECU) of the smart electronic control device (ECU) is only received when a wake-up / trigger signal is received from the smart key. By allowing the second microcontroller to wake up to operate, it is possible to prevent the vehicle battery from being discharged and to reduce power consumption.

In addition, there is an advantage that can be triggered only by a smart key without a separate trigger device such as a door handle switch.

In addition, since the smart key operates only when the movement of the smart key is detected by the motion sensor installed inside the smart key, power consumption of the battery can be reduced.

Claims (11)

In the wake up and trigger method of the passive entry system, (a) transmitting a wake up and trigger signal from the smart key; (b) a second microcontroller of the smart electronic control unit (ECU) wakes up in a sleep state by the wake up signal and confirms a first ID of the smart key by a trigger signal; (c) when the first ID of the smart key is authenticated, the smart electronic control unit (ECU) transmits a second ID request signal to the smart key through a low frequency transmitter; otherwise, the smart electronic controller Bringing (ECU) back to sleep; (d) when the smart key receives a second ID request signal through a low frequency receiver, transmitting the second ID information to the smart electronic control unit (ECU) through a high frequency transmitter; And (e) receiving and decrypting the second ID information through a high frequency receiver in the smart electronic control unit (ECU) to perform an authentication procedure and then perform a door lock / open, engine start, and theft prevention function; A wake up and trigger method for a passive entry system that includes. The method of claim 1, The wake up and trigger method of the passive entry system is: The signal transmission from the smart key to the smart electronic control unit (ECU) is transmitted using a high frequency, Wake up and trigger method of a passive entry system, characterized in that the transmission of the signal to the smart key in the smart electronic control unit (ECU) using a low frequency, but using a magnetic induction coupling scheme. The method of claim 1, The wake up and trigger method of the passive entry system is: (a1) making the first microcontroller, the high frequency transmitter, and the low frequency receiver of the smart key sleep in an initial operation, and making only a motion sensor that detects movement of the smart key active; (a2) when the motion signal is detected by the motion sensor, the first microcontroller wakes up to make the high frequency transmitter and the low frequency receiver active; (a3) transmitting, by the first microcontroller, the wake up / trigger signal to the smart electronic control unit (ECU) via a high frequency antenna via the high frequency transmitter; And and (a4) returning to the step (a1) if the movement stop time of the smart key is longer than a preset set time. delete delete In a passive entry system consisting of a smart key and a smart electronic control unit (ECU), The smart key includes a high frequency transmission unit for transmitting a wake up / trigger signal to the smart electronic controller by a high frequency transmission antenna; A low frequency receiver for receiving a request signal for smart key authentication from the smart electronic controller as the smart key through a low frequency reception antenna according to the wake up / trigger signal; A first control to transmit the wake up / trigger signal to the high frequency transmitter, and to decrypt the request signal for the smart key authentication received through the low frequency receiver to transmit an encrypted response signal to the high frequency transmitter; Microcontroller; A power supply unit supplying necessary power; It is configured to include, The smart electronic controller may include a high frequency receiver configured to receive the wake up / trigger signal and the response signal from the high frequency transmitter of the smart key, respectively; A low frequency transmitter for transmitting a request signal for the smart key authentication to the smart key through a low frequency transmission antenna; Control to receive the wake up / trigger signal received through the high frequency receiver, control to transmit the request signal for the smart key authentication through the low frequency transmitter, and control to receive the response signal through the high frequency receiver A second microcontroller configured to decrypt the encrypted response signal to perform an authentication procedure; A power supply unit supplying necessary power; Passive entry system, characterized in that configured to include. The method of claim 6, wherein the smart key, The apparatus further includes a motion sensor configured to detect movement of the smart key, wherein the first microcontroller makes the smart key enter a wake up or sleep mode according to the motion signal detected by the motion sensor. Passive entry system, characterized in that for controlling. The method of claim 7, wherein the motion sensor is: Passive entry system, characterized in that any one of the displacement sensor, the acceleration sensor. The method according to claim 6 or 7, The low frequency reception antenna is a passive entry system, characterized in that consisting of three antennas in three axes. delete delete

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