KR20200005039A - Vehicle and controlling method for the same - Google Patents

Abstract

The present invention provides a vehicle for performing locking of a vehicle door in accordance with user′s actual intention by using the amount of a change in signal reception intensity between the vehicle and a smart key and a control method thereof. According to an embodiment, the vehicle includes: a communication unit having at least one antenna and performing communication with the smart key; and a control unit that locks a door when the amount of a change in the signal reception intensity of the smart key between the closing time of the door and a predetermined time exceeds a predetermined change amount by using the signal of the smart key received by the communication unit.

Description

Vehicle and Vehicle Control Method {VEHICLE AND CONTROLLING METHOD FOR THE SAME}

It relates to a vehicle and a method of controlling the vehicle.

The smart key system allows the driver to insert a separate key into the vehicle's key box or to open and close the vehicle door and start the vehicle from the outside without special operation for operation. A smart key such as a fob is used.

When a driver with a smart key approaches the vehicle, the lock is automatically released through low frequency (LF) and radio frequency (RF) communication with the smart key, and the door is opened even if a separate key is not inserted. It can be opened and started without the need to insert the ignition key after boarding the vehicle.

Recently, when the at least one antenna and the smart key provided in the vehicle are separated by a certain distance or more, the antenna cannot receive a signal. In this case, a function of automatically locking the vehicle has been developed. However, such a function is only a simple locking (unlocking) and the decision of unlocking (Unlocking) is performed, causing a problem that is vulnerable to security.

The present invention provides a vehicle for performing locking of a vehicle door in accordance with the actual user's intention by using the amount of change in the signal reception intensity between the vehicle and the smart key, and a control method thereof.

According to an embodiment, a vehicle includes at least one antenna, and includes a communication unit configured to communicate with a smart key; And

A control unit for locking the door when the amount of change in the signal reception intensity of the smart key between the closing time of the door and the predetermined time point exceeds the predetermined change amount by using the signal of the smart key received by the communication unit; It includes.

The controller derives a change amount of the signal reception intensity of the smart key from a time point corresponding to the maximum value of the signal reception intensity of the smart key, and if the change amount of the signal reception intensity of the smart key exceeds a predetermined change amount, Locking the door.

The communication unit includes a first antenna and a second antenna,

The controller may be configured to derive a change amount of the signal reception strength of the smart key from a later point in time corresponding to the maximum value of the signal reception strength of the smart key corresponding to each of the first antenna and the second antenna, When the amount of change in the signal reception intensity of the smart key exceeds a predetermined amount of change, the door may be locked.

The controller may estimate the location of the smart key based on time points corresponding to the maximum value of the signal reception strength of the smart key corresponding to each of the first antenna and the second antenna.

The vehicle according to an embodiment may further include a storage unit which stores matching information between a predetermined signal reception strength of the smart key and a location of the smart key.

The controller may estimate the location of the smart key based on the matching information and the signal reception strength of the smart key, and lock the door if it is determined that the smart key leaves a predetermined area. .

The controller may estimate the position of the smart key based on the change amount of the received strength of the smart key if the difference between the matching information and the change amount of the signal received strength of the smart key is less than a predetermined value, and thereby the position of the smart key. Can be stored in the storage.

The communication unit may perform low frequency (LF) communication and radio frequency (RF) communication with the smart key.

In a vehicle control method according to an embodiment, a communication amount with a smart key is used, and a change amount of a signal reception strength of the smart key between a time point of closing a door and a predetermined time point using a signal of the smart key received by a communication unit. If the predetermined amount of change is exceeded, locking the door is included.

According to an embodiment of the present disclosure, the locking of the door may include deriving an amount of change in the signal reception strength of the smart key from a time point corresponding to the maximum value of the signal reception strength of the smart key. Locking the door if the amount of change in signal reception strength of the key exceeds a predetermined amount of change.

Locking the door may derive the amount of change in the signal reception strength of the smart key from a later point in time corresponding to the maximum value of the signal reception strength of the smart key corresponding to each of the first and second antennas. And locking the door when the amount of change in signal reception strength of the smart key exceeds a predetermined amount of change.

The vehicle control method according to an embodiment of the present disclosure further includes estimating the location of the smart key based on time points corresponding to the maximum value of the signal reception strength of the smart key corresponding to each of the first antenna and the second antenna. Include.

Vehicle control method according to an embodiment,

Storing matching information between a predetermined signal reception strength of the smart key and a location of the smart key, estimating the location of the smart key based on the matching information and the signal reception strength of the smart key,

Locking the door may include locking the door if it is determined that the smart key leaves a predetermined area.

The vehicle control method according to an embodiment may estimate the position of the smart key based on the change amount of the received strength of the smart key when the difference between the matching information and the change amount of the signal received strength of the smart key is less than a predetermined value. And storing the location of the smart key.

Performing communication with the smart key may include performing low frequency (LF) communication and radio frequency (RF) communication with the smart key.

According to an embodiment of the present disclosure, a vehicle and a method of controlling the same may perform locking of a vehicle door in accordance with a substantial user's intention by using a change amount of signal reception strength between the vehicle and a smart key.

1 is an external view of a vehicle according to an exemplary embodiment.
2 is a diagram illustrating an internal configuration of a vehicle according to an exemplary embodiment.
3 is an exemplary view of a smart key according to an embodiment.
4 is a diagram illustrating a signal transmission and reception process between a vehicle and a smart key.
5 is a control block diagram of a vehicle according to an exemplary embodiment.
6 is a control block diagram of a smart key according to an embodiment.
7 is a diagram for describing an operation based on signal reception strength of one antenna, according to an exemplary embodiment.
8 is a diagram for describing an operation based on signal reception strengths of a plurality of antennas according to an exemplary embodiment.
9 is a flowchart according to one embodiment.

Like reference numerals refer to like elements throughout the specification. The present specification does not describe all elements of the embodiments, and overlaps between general contents or embodiments in the technical field to which the present invention belongs. The term 'part, module, member, block' used in the specification may be implemented in software or hardware, and a plurality of 'part, module, member, block' may be embodied as one component, It is also possible that one 'part, module, member, block' includes a plurality of components.

Throughout the specification, when a part is said to be "connected" with another part, it includes not only directly connected but also indirectly connected, and indirect connection includes connecting through a wireless communication network. do.

In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

Throughout the specification, when a member is located "on" another member, this includes not only when one member is in contact with another member but also when another member is present between the two members.

The terms first, second, etc. are used to distinguish one component from another component, and the component is not limited by the terms described above.

Singular expressions include plural expressions unless the context clearly indicates an exception.

In each step, the identification code is used for convenience of explanation, and the identification code does not describe the order of each step, and each step may be performed differently from the stated order unless the context clearly indicates a specific order. have.

Hereinafter, the working principle and the embodiments of the present invention will be described with reference to the accompanying drawings.

1 is an external view of a vehicle according to an embodiment, and FIG. 2 is a diagram illustrating an internal configuration of the vehicle according to an embodiment.

Referring to FIG. 1, the exterior of a vehicle 100 according to an embodiment may include wheels 12 and 13 for moving the vehicle 100, a door 15L for shielding the inside of the vehicle 100 from the outside, and the vehicle 100. The front glass 16 provides a view of the vehicle 100 in front of the vehicle 100, and side mirrors 14L and 14R provide a view of the vehicle 100 in the rear of the vehicle 100.

The wheels 12 and 13 include a front wheel 12 provided at the front of the vehicle and a rear wheel 13 provided at the rear of the vehicle, and a driving device (not shown) provided inside the vehicle 100 is the vehicle 100. ) Provides a rotational force to the front wheel 12 or the rear wheel 13 to move forward or backward. Such a driving device may employ a motor that generates rotational force by receiving power from an engine or a capacitor that burns fossil fuel and generates rotational force.

The doors 15L and 15R (refer to FIG. 2) may be rotatable on the left and right sides of the vehicle 100 to allow the driver or passenger to board the inside of the vehicle 100 at the time of opening, and the vehicle ( The inside of 100) is shielded from the outside. In addition, a handle 17L may be provided outside the vehicle 100 to open and close the doors 15L and 15R (see FIG. 2), and the handle 17L may transmit a low frequency (LF) signal. An LF antenna (not shown) may be mounted.

When the authentication between the smart key 200 (see FIG. 3) and the vehicle 100 is completed through the wireless communication network, the door lock of the vehicle 100 is released, and the door 15L may be opened by the user's handle 17L pulling operation. Can be.

The windshield 16 is provided at the front upper side of the main body so that a driver in the vehicle 100 may obtain visual information in front of the vehicle 100, and is also referred to as windshield glass.

In addition, the side mirrors 14L and 14R include a left side mirror 14L provided on the left side of the vehicle 100 and a right side mirror 14R provided on the right side, and the driver inside the vehicle 100 may have a vehicle ( It is possible to obtain the visual information of the side and back of 100).

In addition, the vehicle 100 may include a sensing device such as a proximity sensor that detects an obstacle or another vehicle at the rear or side, a rain sensor that detects precipitation and precipitation, and the like.

The proximity sensor may transmit a detection signal to the side or the rear of the vehicle and receive a reflection signal reflected from an obstacle such as another vehicle. The presence of an obstacle on the side or the rear of the vehicle 100 may be detected based on the waveform of the received reflected signal, and the position of the obstacle may be detected. As an example of such a proximity sensor, a method of transmitting an ultrasonic wave or an infrared ray and detecting a distance to the obstacle by using the ultrasonic wave or the infrared ray reflected on the obstacle may be adopted.

2, an audio video navigation (AVN) display 71 and an AVN input unit 61 may be provided in a central area of the dashboard 29. The AVN display 71 may selectively display at least one of an audio screen, a video screen, and a navigation screen, as well as a screen related to various control screens or additional functions related to the vehicle 100.

The AVN display 71 may be implemented as a liquid crystal display (LCD), a light emitting diode (LED), a plasma display panel (PDP), an organic light emitting diode (OLED), a cathode ray tube (CRT), or the like.

The AVN input unit 61 may be provided as a hard key type in an area adjacent to the AVN display 71, or when the AVN display 71 is implemented as a touch screen type, in the form of a touch panel on the front of the AVN display 71. It may be arranged.

In addition, a jog shuttle type center input portion 62 may be provided between the driver's seat 18L and the passenger seat 18R. The user may input a control command by rotating or pressing the center input unit 62 or by pushing in the up, down, left or right direction.

The vehicle 100 may be provided with a sound output unit 80 for outputting sound, and the sound output unit 80 may be a speaker. The sound output unit 80 may output sound necessary for performing an audio function, a video function, a navigation function, and other additional functions.

A steering wheel 27 is provided on the dashboard 29 of the driver's seat 18L, and a smart key 200 (for example, a fob key; see FIG. 3) is located in an area adjacent to the steering wheel 27. An insertable key groove 29a may be formed. When the smart key 200 is inserted into the key groove 29a or when the authentication between the smart key 200 and the vehicle 100 is completed through a wireless communication network, the smart key 200 and the vehicle 100 may be connected.

In addition, the dashboard 29 may be provided with a start button 31 for controlling the on / off of starting of the vehicle 100, the smart key 200 is inserted into the key groove 29a, or through a wireless communication network. If the authentication between the smart key 200 and the vehicle 100 is successful, the start of the vehicle 100 may be turned on by pressing the start button 31 of the user.

On the other hand, the vehicle 100 is provided with an air conditioning apparatus can perform both heating and cooling, it is possible to control the temperature inside the vehicle 100 by discharging the heated or cooled air through the vent (21).

3 is an exemplary view of a smart key according to an embodiment.

The smart key 200 is connected to the vehicle 100 through transmission and reception of wired or wireless signals.

As an example disclosed in FIG. 3, the smart key 200 may be a fob key that is connected to the vehicle 100 by wire or wirelessly to release the door lock, or enable starting and driving.

The smart key 200 according to the embodiment disclosed in FIG. 3 may include all the input devices for controlling the vehicle 100 such as unlocking the door lock or enabling starting and driving even if the key is not a fob key. For example, when the mobile device serves as a smart key, the disclosed smart key 200 may include the mobile device. In this case, an application capable of executing the operation as the smart key 200 may be installed in the mobile device. The mobile device may be installed with the application and sold or may download the application from the server after the sale. In addition, the mobile device may go through an authentication procedure to operate as the smart key 200 for the vehicle 100.

The smart key 200 may be sold together with the vehicle 100, and authentication information for connection with the vehicle 100 may be stored in advance.

The smart key 200 and the vehicle 100 transmit and receive signals to and from each other through an LF communication network and an RF communication network in order to perform a mutual authentication procedure.

The LF communication network is a low frequency band communication network used by the vehicle 100 to transmit an LF signal for scanning the smart key 200. For example, the LF communication network may be a communication network having a frequency band of 20 kHz to 135 kHz. When transmitting and receiving an LF signal through the LF communication network, the transmission and reception distance of the signal is shorter than the transmission and reception distance of the RF communication network having a high frequency band due to the characteristics of the low frequency band. For example, the LF signal transmission and reception distance may be about 12 m, and the RF signal transmission and reception distance may be about 100 m.

Therefore, the vehicle 100 may scan the smart key 200 proximate to the vehicle 100 by transmitting the LF signal through the LF communication network.

The RF communication network is a communication network of a high frequency band for receiving an RF signal from the smart key 200 in which the vehicle 100 receives the LF signal, and may be, for example, a communication network having a frequency band of 315 MHz or more and 433 MHz or less. When transmitting and receiving an RF signal through the RF communication network, the transmission and reception distance of the signal is longer than the LF network transmission and reception distance having a low frequency band.

The LF signal includes a scanning signal for searching for the smart key 200 around the vehicle 100 (that is, within a LF signal transceivable distance).

The RF signal includes a scanning response signal generated by the smart key 200 as a signal in response to the scanning signal.

4 is a diagram illustrating a signal transmission and reception process between a vehicle and a smart key.

Referring to FIG. 4, when the smart key 200 exists within a transmission / receivable distance of the LF signal from the vehicle 100 and includes an LF antenna, the smart key 200 receives the LF signal from the vehicle 100 through the LF communication network. It may receive and transmit the RF signal to the vehicle 100 through the RF communication network. In this case, the smart key 200 may measure the strength of the LF signal transmitted from the vehicle 100, and the strength information of the LF signal may be included in the RF signal and transmitted to the vehicle 100. The vehicle 100 may estimate the distance between the driver carrying the smart key 200 and the vehicle 100 based on the strength information of the LF signal.

However, if the smart key 200 does not exist within a distance capable of transmitting and receiving the LF signal from the vehicle 100, the smart key 200 receives the LF signal even when the vehicle 100 transmits the LF signal around via the LF communication network. Can not. Therefore, the smart key 200 does not transmit the RF signal to the vehicle 100.

In addition, when the smart key 200 includes a three-dimensional LF antenna, the smart key 200 may know not only the strength of the LF signal transmitted by the vehicle 100, but also the direction in which the LF signal is transmitted. In this case, the smart key 200 may transmit information on the strength and direction of the LF signal to the vehicle 100 through the RF communication network, and the control unit 140 of the vehicle 100 may transmit the information on the strength and direction of the LF signal. Based on the information about the driver, not only the distance from the driver's vehicle 100 having the smart key 200 but also the relative position of the driver's vehicle 100 may be detected.

5 is a control block diagram of a vehicle according to an exemplary embodiment.

Referring to FIG. 5, the vehicle may include a communication unit, a controller, and a storage unit.

Referring to FIG. 5, the communication unit 110 of the vehicle 100 may include at least one antenna and perform communication with a smart key.

The communication unit 110 includes an LF communication unit 111 for transmitting an LF signal within a distance capable of transmitting and receiving an LF signal through an LF communication network, and an RF communication unit 112 for receiving an RF signal within an RF receiving distance within an RF communication network. do.

The LF communication unit 111 may transmit the LF signal for searching for the surrounding smart key 200 through the LF communication network at intervals set by the control unit 120. The LF communication unit 111 may include a LF communication interface including a communication port for connecting the LF communication network and the control unit 140 and a transmitter for transmitting the LF signal.

In addition, the LF communication unit 111 may further include a LF signal conversion module for modulating the digital control signal output from the control unit 140 into an analog type LF signal through the LF communication interface under the control of the control unit 140. .

The RF communication unit 112 receives an RF signal from the smart key 200 through the RF communication network.

The RF signal is a response signal transmitted from the smart key 200 receiving the LF signal, and may include authentication information shared between the vehicle 100 and the smart key 200, and received by the smart key 200. It may include strength information and direction information of the LF signal.

The RF communication unit 112 may include an RF communication interface including a communication port for connecting the RF communication network and the control unit 140 and a receiver for receiving an RF signal.

In addition, the RF communication unit 112 may further include an RF signal conversion module for demodulating an analog RF signal received through an RF communication interface into a digital control signal.

The control signal, the RF signal, and the LF signal of the vehicle 100 may have different formats.

In addition, as described above, the communication unit may include a plurality of antennas.

The storage unit 120 may store matching information between a predetermined signal reception strength of the smart key and a location of the smart key.

The storage unit 120 includes a memory for storing a program and data for controlling the components of the vehicle 100.

According to an exemplary embodiment, the storage 120 and the controller 140 may be implemented as separate memory devices and processors, or may be implemented in a single device.

The controller 140 controls each component included in the vehicle 100. The controller 140 may include a processor that generates a control signal according to a program and data stored in the storage 120.

The control unit 140 locks the door when the amount of change in the signal reception intensity of the smart key between the closing time of the door and the predetermined point of time exceeds the predetermined change amount by using the signal of the smart key received by the communication unit. ) can do.

When the user closes the door in the situation of closing the door of the vehicle when getting off, the smart key is present in the position closest to the door. After that, when the smart key is disembarked away from the antenna, the reception strength of the smart key changes. Inevitably, the change in the reception strength of the smart key is inevitably small. It is written down. In addition, since the signal reception strength of the smart key is inversely proportional to the distance, in this case, the control unit may lock the door of the vehicle by determining that the smart key is spaced apart from the vehicle.

In detail, the control unit 140 may derive a change amount of the signal reception strength of the smart key from a time point corresponding to the maximum value of the signal reception strength of the smart key.

Meanwhile, the vehicle 100 may operate with a plurality of antennas, and the maximum value of the signal reception strength of the smart key corresponding to each of the first antenna and the second antenna as the first antenna and the second antenna, and the second antenna respectively. From a later point in time corresponding to, the amount of change in signal reception strength of the smart key may be derived. In addition, the controller 140 may estimate the location of the smart key based on time points corresponding to the maximum value of the signal reception strength of the smart key corresponding to each of the first antenna and the second antenna. Details related to this will be described later.

The controller 140 may estimate the location of the smart key based on the matching information stored in the storage 120 and the signal reception strength of the smart key. That is, since the storage unit 120 stores matching information of signal reception strength and position of the smart key, the controller 140 may estimate the location of the smart key by matching the matching information with the signal reception strength.

In addition, the controller 140 may determine whether the amount of change in the signal reception strength of the smart key is less than a predetermined value. The amount of change in signal reception strength of the smart key may be a change amount according to the distance between the smart key and the antenna. Therefore, when the difference between the signal reception intensity change amount and the matching information of the smart key is small, the controller 140 may determine the corresponding signal reception intensity change amount as reliable information. The controller 140 may determine a valid signal having high reliability based on the change amount, and store the location of the smart key determined based on the valid signal.

6 is a control block diagram of the smart key 200 according to an embodiment.

Referring to FIG. 6, the smart key 200 according to an embodiment of the present invention includes a communication unit 210 for transmitting and receiving a signal to the vehicle 100, a storage unit 220 for storing data, and components of the smart key 200. The control unit 230 for controlling the operation of the.

The terminal communication unit 210 of the smart key 200 transmits an RF signal within an allowable distance for transmitting / receiving an RF signal through an LF communication unit 211 and an RF communication network that receive an LF signal within an LF receiving distance within an LF communication network. The communication unit 212 is included.

The LF communication unit 211 may receive the LF signal through the LF communication network.

The LF communication unit 211 may include an LF communication interface including a communication port for connecting the LF communication network and the terminal control unit 230 of the smart key 200 and a receiver for receiving the LF signal. . The receiver receiving the LF signal may include a 3D LF antenna, and the 3D LF antenna may detect the strength and direction of the LF signal. The three-dimensional LF antenna is well known in the art and thus detailed description thereof is omitted.

In addition, the LF communication unit 211 may further include an LF signal conversion module for demodulating the analog LF signal received through the LF communication interface into a digital control signal.

The RF communication unit 212 transmits an RF signal corresponding to the LF signal to the vehicle 100 through the RF communication network. The RF signal may include authentication information shared between the smart key 200 and the vehicle 100, and may also include information about the strength and direction of the LF signal detected by the 3D LF antenna.

In addition, the RF communication unit 212 may further include an RF signal conversion module for modulating the digital control signal output from the control unit 230 into an analog RF signal through the RF communication interface under the control of the control unit 230. .

The control signal, the RF signal, and the LF signal of the smart key 200 may have different formats.

The terminal storage unit 220 stores authentication information shared between the smart key 200 and the vehicle 100.

According to an exemplary embodiment, the terminal storage unit 220 and the terminal control unit 230 may be implemented as separate memory devices and processors, or may be implemented in a single device.

The terminal controller 230 controls each component included in the smart key 200.

The terminal controller 230 determines whether the authentication information of the vehicle 100 included in the LF signal and the authentication information included in the smart key 200 correspond to each other, and transmits an RF signal to the vehicle 100 only when they match. It is also possible.

The terminal controller 230 may estimate a driver's position (ie, the distance between the vehicle 100 and the smart key 200) with respect to the vehicle 100 based on the detected strength of the LF signal, and the estimated position. It is also possible to transmit the information to the vehicle 100 via the RF communication network. However, for convenience of description, the driver's position estimation will be described taking the example of being performed in the vehicle 100.

The terminal controller 230 may include a processor that generates a control signal according to a program and data stored in the storage 220.

At least one component may be added or deleted to correspond to the performance of the components of the vehicle illustrated in FIGS. 5 and 6. In addition, it will be readily understood by those skilled in the art that the mutual position of the components may be changed corresponding to the performance or structure of the system.

Meanwhile, each component illustrated in FIGS. 5 and 6 refers to hardware components such as software and / or a field programmable gate array (FPGA) and an application specific integrated circuit (ASIC).

7 is a diagram for describing an operation based on signal reception strength of one antenna, according to an exemplary embodiment.

Referring to FIGS. 7A and 7B, the controller 140 may determine the location of the user using the amount of change in the signal reception intensity. From the time point t1 at which the user gets off and closes the door, the control unit may derive the signal reception intensity and determine a point t2 at which the reception intensity is maximum. The control unit may determine that the maximum point is determined by the case where the signal reception intensity increases and then decreases. The controller may calculate the descending slope from the point t2 at which the reception intensity is maximum. The falling slope may be derived as a change amount of the signal according to the distance between the smart key and the antennas 113a-1, 113a-2, 113b, 113c-1, 113c-2, and 113d.

Meanwhile, as described above, the storage unit 120 may store the matching information in advance, and the matching information may form a slope by calculating an amount of signal reception strength that is reduced according to a general step of the user when the smart key is set. The controller 140 may determine that the user moves near the vehicle instead of leaving the vehicle when the reception strength decreases according to the matching information, that is, the calculated slope. On the other hand, if it is reduced by more than a predetermined change amount compared to the point t2, which is the maximum, it may be determined that the user has left the vehicle. In this case, the controller 140 may lock the door of the vehicle.

8 is a diagram for describing an operation based on signal reception strengths of a plurality of antennas according to an exemplary embodiment.

FIG. 8A shows a plurality of antennas, and FIG. 8B is a graph showing signal reception intensities corresponding to the plurality of antennas. Operations of each of the antennas of FIGS. 8A and 8B may operate including those described with reference to FIG. 7.

8A and 8B, the smart key moves from the third antenna 113c-1 to the fifth antenna 113d after passing through the fourth antenna 113c-2. When the smart key moves a plurality of antennas, the reception strength may vary as shown in FIG. 8B.

If the signal reception strength of the fourth antenna 113c-2 increases (t11-t12) in proportion to the amount t11-t12 of decreasing the signal reception strength of the third antenna 113c-1, the control unit may return the user from the driver's seat. It may be determined that the vehicle moves to the rear seat, that is, the fourth antenna 113c-2.

In addition, when the signal reception strength of the fifth antenna increases while the signal reception strength of the fourth antenna 113c-2 decreases (t12-t13), the controller may determine that the smart key is located in the trunk. The controller 140 may determine that the smart key has left the vehicle when the amount of change after the signal reception intensity t3 of the fifth antenna 113d exceeds a predetermined value. In this case, the controller 140 may lock the door. On the other hand, the operation described in Figures 7 and 8 is only an embodiment of the present invention and if the operation of locking the vehicle based on the amount of change in the signal reception intensity is not limited to the implementation of the invention. In particular, the third to fifth antennas 113c-1, 113c-2, and 113d described with reference to FIG. 8 are expressions designated to refer to a plurality of antennas, and an ordinal number is not limited to a specific antenna.

9-11 are flowcharts according to one embodiment.

Referring to FIG. 9, when the user closes the door 1001, the controller may determine a time point 1002 corresponding to the maximum value of the signal reception strength of the smart key. The controller may derive the amount of change in the signal reception strength of the smart key from the maximum value of the signal reception strength of the smart key (1003). The controller may determine whether the amount of change in signal reception intensity of the smart key exceeds a predetermined amount of change (1004). The change in the reception intensity exceeds the predetermined change amount, and the smart key has left the vehicle, and the controller may lock the door of the vehicle (1005).

Referring to FIG. 10, when the user closes the door (1011), the controller may determine a time point corresponding to the maximum value of the signal reception strength of the smart key corresponding to each of the first antenna and the second antenna (1012). have. In this case, since the maximum value may exist, the controller may derive the amount of change in the signal reception strength of the smart key from the maximum value of the signal reception strength of the smart key from a later point in time corresponding to the maximum value (1013). The controller may determine whether the amount of change in the signal reception intensity of the smart key exceeds a predetermined amount of change (1014). The change in the reception intensity exceeds the predetermined change amount because the smart key has left the vehicle, and the controller may lock the door of the vehicle (1015).

Referring to FIG. 11, the storage unit may store matching information between a predetermined signal reception strength of the smart key and a location of the smart key. 1021. When the difference is less than a predetermined value (1022), the change in the signal reception strength is a change amount suitable for deriving the location of the smart key, and the control unit estimates the location of the smart key based on the change in the reception strength of the smart key. The location of the smart key may be stored 1023 in the storage unit.

On the other hand, the disclosed embodiments may be implemented in the form of a recording medium for storing instructions executable by a computer. Instructions may be stored in the form of program code, and when executed by a processor, may generate a program module to perform the operations of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

Computer-readable recording media include all kinds of recording media having stored thereon instructions which can be read by a computer. For example, there may be a read only memory (ROM), a random access memory (RAM), a magnetic tape, a magnetic disk, a flash memory, an optical data storage device, and the like.

As described above, the disclosed embodiments have been described with reference to the accompanying drawings. Those skilled in the art to which the present invention pertains have a form different from the disclosed embodiments without changing the technical spirit or essential features of the present invention. It will be understood that the present invention can be practiced with. The disclosed embodiments are exemplary and should not be construed as limiting.

100: vehicle
110: communication unit
120: storage unit
140: control unit
200: smart key

Claims (14)

A communication unit including at least one antenna and communicating with a smart key; And
By using the signal of the smart key received by the communication unit,
And a controller configured to lock the door when the amount of change in the signal reception intensity of the smart key between the point of closing the door and the predetermined point of time exceeds a predetermined amount of change.
The method of claim 1,
The control unit,
From the time point corresponding to the maximum value of the signal reception strength of the smart key, the amount of change in the signal reception strength of the smart key is derived,
And locking the door when the amount of change in signal reception strength of the smart key exceeds a predetermined amount of change.
The method of claim 2,
The communication unit,
A first antenna and a second antenna,
The control unit,
From the later of the time corresponding to the maximum value of the signal reception strength of the smart key corresponding to each of the first antenna and the second antenna, a change amount of the signal reception strength of the smart key is derived,
And locking the door when the amount of change in signal reception strength of the smart key exceeds a predetermined amount of change.
The method of claim 2,
The control unit,
And estimating a location of the smart key based on time points corresponding to a maximum value of a signal reception strength of the smart key corresponding to each of the first antenna and the second antenna.
The method of claim 1,
And a storage unit which stores matching information between a predetermined signal reception strength of the smart key and a location of the smart key.
The control unit,
Estimate the location of the smart key based on the matching information and the signal reception strength of the smart key,
And locking the door when the smart key is determined to leave a predetermined area.
The method of claim 5,
The control unit,
If the difference between the amount of change in the signal reception strength of the matching information and the smart key is less than a predetermined value,
And estimating the location of the smart key based on a change amount of the received strength of the smart key and storing the location of the smart key in a storage unit.
The method of claim 1,
The communication unit,
A vehicle performing low frequency (LF) communication and radio frequency (RF) communication with the smart key.
Communicate with the smart key,
By using the signal of the smart key received by the communication unit,
And locking the door when the amount of change in the signal reception intensity of the smart key between the point of time of closing the door and the predetermined point of time exceeds the predetermined amount of change.
The method of claim 8,
Locking the door is to derive the amount of change in the signal reception strength of the smart key from the time corresponding to the maximum value of the signal reception strength of the smart key,
And locking the door when the amount of change in signal reception intensity of the smart key exceeds a predetermined amount of change.
The method of claim 8,

Locking the door,
From the later of the time points corresponding to the maximum value of the signal reception strength of the smart key corresponding to each of the first antenna and the second antenna, the amount of change in the signal reception strength of the smart key is derived,
And locking the door when the amount of change in signal reception intensity of the smart key exceeds a predetermined amount of change.
The method of claim 10,
And estimating a location of the smart key based on points of time corresponding to a maximum value of signal reception strength of the smart key corresponding to each of the first antenna and the second antenna.
The method of claim 8,
Storing matching information between a predetermined signal reception strength of the smart key and a location of the smart key,
Estimate the location of the smart key based on the matching information and the signal reception strength of the smart key,
Locking the door,
And locking the door when the smart key is determined to leave the predetermined area.
The method of claim 12,
If the difference between the amount of change in the signal reception strength of the matching information and the smart key is less than a predetermined value,
And estimating the location of the smart key based on the change amount of the received strength of the smart key and storing the location of the smart key.
The method of claim 8,
Communicating with the smart key,
Vehicle control method comprising performing the smart key and LF (Low Frequency) communication and RF (Radio Frequency) communication.

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