KR20150055282A - Vehicle door lock system using radar and control method thereof - Google Patents

Abstract

Published is a vehicle door lock system using radar and a control method thereof. The vehicle door lock system according to the present invention comprises: a sensor comprising a radar sensor, for sensing an object approaching a vehicle; a plurality of door lock switches mounted to correspond to vehicle doors, respectively, in order to lock the vehicle doors or release the locking; an interface part for warning a passenger of the vehicle about an approach of an object sensed in the sensor; and a system controller for controlling the door lock switch in a locking state according to a location and speed of the object sensed in the sensor, and outputting an warn through the interface part.

Description

TECHNICAL FIELD [0001] The present invention relates to a vehicle door lock system using a radar,

The present invention relates to a door opening / closing apparatus for a vehicle and a control method thereof, and more particularly, to a forced door opening / closing apparatus using a vehicle radar and a control method thereof.

Various traffic situations are being produced according to the increase of various kinds of vehicles on the road, and various incidents which are not considered in the past due to diversification of traffic situations are occurring. Among these accidents, many accidents caused by vehicle doors are included. Accidents on vehicle doors can be classified into two types: accidents occurring during vehicle operation and accidents occurring during vehicle stop.

Accidents that occur during vehicle operation are accidents caused by the escape of passengers due to door opening, collision between doors and nearby vehicles, and accidents during stopping the vehicle are caused by accidental collision due to carelessness when the passenger gets off. Accidents caused by these vehicle doors during the operation of the vehicle have been largely eliminated as most of the vehicles released in recent years provide automatic door locking function during vehicle operation. The door automatic locking function during the vehicle operation is set so that the door lock of the vehicle is automatically locked when the running speed of the vehicle exceeds the predetermined speed, so that the door is not opened due to the carelessness of the passenger.

However, the door lock function can not be applied when the vehicle is stopped. The door can be set as a lock because the passenger does not get on or off while the vehicle is in operation. However, the passenger must be able to freely ride and get off the vehicle during stopping the vehicle. Therefore, most of the accidents caused by the present vehicle door are accidents caused by collision of the door or the passenger with the vehicle, the motorcycle, and the pedestrian due to carelessness when the passenger gets off.

Korean Registered Utility Model No. 20-0459228 (Mar. 03, 2012) detects an approach of a passenger's hand to the door lever before the door is opened by a proximity sensor to generate an alarm in the room and outdoors in advance, So that the passengers are cautioned, and an object approaching the outside can recognize that the door is opened. However, according to the above-described conventional technique, the detection distance is very short due to the use of the proximity sensor, so that there is a limit in that the surrounding situation can not be accurately discriminated. In addition, since only an alarm is generated, there is a case that a warning sound is not recognized in the passenger and the surroundings of the vehicle when there are various noises in the inside and the outside of the vehicle. .

An object of the present invention is to provide a vehicle door locking system capable of forcibly locking a door by discriminating an object approaching the vehicle using a radar.

It is another object of the present invention to provide a method of controlling a vehicle door lock system.

According to an aspect of the present invention, there is provided a vehicle door locking system comprising: a sensor unit having a radar sensor to detect an object approaching a vehicle; A plurality of door lock switches corresponding to each of the vehicle doors for locking and unlocking the vehicle door; An interface unit for alerting an occupant of the vehicle to an approach of an object detected by the sensor unit; And a system controller for controlling the door lock switch to a locked state according to a position and a speed of an object detected by the sensor unit and outputting a warning through the interface unit; .

Wherein the sensor unit comprises: a plurality of occupant detection sensors for determining a sitting position in the vehicle of the occupant; And a radar sensor for detecting a position and a moving speed of the object, tracking the determined object, receiving object information generated from the object information, and boarding detection information from each of the plurality of the occupant detection sensors, A sensor control unit for transmitting the boarding position information to the system control unit; And further comprising:

Wherein the system control unit receives the object information and the boarding position information from the sensor control unit, and when the approach direction of the object determined from the object information is a direction corresponding to the boarding position information, And the door lock switch corresponding to the boarding position is controlled to be in a locked state.

The system control unit analyzes the RCS and the moving speed detected by the radar sensor by the radar sensor from the object information and outputs the different types of alarm through the interface unit by distinguishing the object according to the analyzed RCS .

Wherein the interface unit comprises: a warning output unit for visually and audibly displaying the door lock switch to a forced lock state to the occupant and a person outside the vehicle; An HMI unit for receiving alarm information from the system control unit and controlling the alarm output unit according to the alarm information to output a warning; And a control unit.

The vehicle door locking system is driven by receiving power from a constant power source unit provided in the vehicle irrespective of whether the vehicle is started or not.

According to another aspect of the present invention, there is provided a control method for a vehicle door lock system including a sensor unit having a radar sensor, a plurality of door lock switches, an interface unit, The system control unit activating the sensor unit to drive the radar sensor; Determining whether at least one door lock switch of the plurality of door lock switches is in an open state and determining whether an object is detected by the radar sensor when the door lock switch is in an open state; Controlling the at least one door switch of the plurality of door lock switches to the forced lock state according to the detected position and velocity of the object when the system controller determines that an object approaching the vehicle from the radar sensor is detected ; And outputting a warning to the occupant in the vehicle through the interface unit; .

Wherein the sensor unit further includes a plurality of occupant detection sensors for discriminating a seating position of the occupant in the vehicle, and the step of controlling the at least one door switch to a locked state comprises: Determining whether a seating position of the sensed occupant corresponds to an approach direction of the object; And controlling a door lock switch corresponding to a seating position of the occupant out of the plurality of door lock switches to a forced lock state when the seating position corresponds to the approach direction of the object; And a control unit.

The step of outputting the warning may include: analyzing the RCS and the moving speed of the object sensed by the radar sensor, and identifying the object according to the analyzed RCS; And outputting the warning of different types according to the distinguished RCS; And a control unit.

Accordingly, the vehicle door locking system and its control method using the radar of the present invention can detect and approach an object approaching the vehicle using a radar provided in the vehicle, thereby forcibly locking the vehicle door. Therefore, it is possible to prevent a collision that may occur when a passenger gets off the vehicle, thereby securing the safety of the passenger, the approaching vehicle, and the pedestrian.

1 shows a vehicle door locking system using a radar according to an embodiment of the present invention.
2 shows an example of a transmission / reception signal of a radar for a vehicle.
Fig. 3 shows an example of a mount position and a detection area of the radar in the vehicle door lock system of Fig.
FIG. 4 shows an example of a mounting position of the occupant detection sensor in the vehicle door locking system of FIG. 1. FIG.
Fig. 5 shows an example of the mounting position of the operation indicator in the vehicle door locking system of Fig. 1. Fig.
Figs. 6 to 9 show the detection results of the objects detected in the radar for the vehicle.
10 shows detection and tracking results for a plurality of moving targets in a vehicle radar.
11 shows a door control method of a vehicle door locking system according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in various different forms, and is not limited to the embodiments described. In order to clearly describe the present invention, parts that are not related to the description are omitted, and the same reference numerals in the drawings denote the same members.

Throughout the specification, when an element is referred to as "including" an element, it does not exclude other elements unless specifically stated to the contrary. The terms "part", "unit", "module", "block", and the like described in the specification mean units for processing at least one function or operation, And a combination of software.

1 shows a vehicle door locking system using a radar according to an embodiment of the present invention.

Referring to FIG. 1, the vehicle door locking system of the present invention includes a sensor unit 100, a power source unit 200, a system control unit 300, a door lock switch 400, and an interface unit 500.

The sensor unit 100 includes a radar sensor 110, an occupant detection sensor 120, and a sensor control unit 130 to detect an object near the vehicle and determine a boarding position of the occupant. The radar sensor 110 transmits a radio wave of a predetermined waveform as a transmission signal, receives the reflected wave reflected from the object as a reception signal, analyzes the frequency difference between the transmission signal and the reception signal, And transmits the distance and speed to the sensor control unit 130. Generally, a general radar sensor installed in a vehicle is a Frequency Modulation Continuous Wave (FMCW) radar. In the present invention, it is assumed that the radar sensor 110 is an FMCW radar.

2 shows an example of a transmission / reception signal of a radar for a vehicle.

As shown in FIG. 2, the FMCW radar linearly varies the frequency of a transmission signal, receives a reception signal as a reflected wave, generates a bit frequency that is a frequency component difference between the two signals, Distance and speed. First, the FMCW radar transmits the frequency of the transmission signal in a linear manner. The object to which the transmission signal of the radar sensor reaches reaches the transmission signal to generate the reflected wave, and the reflected wave is received to the radar as the reception signal. The received signal is delayed and received according to the distance to the object, and the difference (f _d ) with the frequency of the transmitted signal is generated by the Doppler effect according to the relative speed difference between the radar and the object. In Fig. 2, the TX signal is a transmission signal, and the RX signal is reflected on an object to indicate a received signal. And a frequency difference between the transmitting signal and the received signal (f _d) is the bit frequency (f _b) as, when and fall as the frequency rises, each of the transmission frequency and a difference of up chirp beat frequency between the reception frequency (f _bu ) And the down chirp bit frequency (f _bd ). When the upchip bit frequency (f _bu ) and the down chirp bit frequency (f _bd ) are obtained, the distance (R) to the object can be obtained according to Equation (1).

(Where BW is the bandwidth, T _m is a dwell (dwell) time, f _bu an up chirp beat frequency, f _bd is up chirp beat frequency, R is the distance of the object, and c denotes the speed of light.)

And the relative velocity (V) of the object can be obtained according to Equation (2).

(Where V is the relative speed, c is the speed of light, f _bu is the up-bit frequency, f _bd is the down-bit frequency, and f _c is the center frequency).

The radar sensor 110 can sense the distance and velocity with respect to the object according to Equations 1 and 2, and transmits information about the sensed object to the sensor control unit 130 as target information.

Fig. 3 shows an example of a mount position and a detection area of the radar in the vehicle door lock system of Fig.

In the present invention, the vehicle mount position of the radar sensor 110 is not limited, but is preferably mounted at both ends of the vehicle rear as shown in Fig. Generally, most of the accidents occurring in the process of getting off the passengers during the stopping of the vehicle are caused by objects approaching from the rear, not from the front which the occupant can watch. Therefore, the vehicle door locking system of the present invention places the radar sensor 110 on both sides of the rear of the vehicle so that the passenger can determine whether or not the door is locked by detecting an object existing in a visually unrecognizable area.

However, as described above, the radar sensor 110 may be disposed at a position other than both ends of the vehicle rear side, and may be disposed at another position with both ends of the vehicle rear side. The number of radar sensors 110 provided in the vehicle is not limited in the present invention.

Generally, the vehicle is provided with a side mirror for detecting a vehicle approaching from the rear. However, only the side mirrors disposed on the left and right sides of the vehicle cause a blind spot detection (BSD) region (or blind spot) in which the driver can not observe the vehicle approaching from the rear side as shown in Fig. Such a BSD area frequently causes a vehicle to suddenly appear when a driver tries to change lanes while driving or when the driver wants to turn the vehicle, thereby causing accidents.

Recently, vehicle makers are trying to provide traffic safety by providing a blind spot detection system that detects blind spots using radar. In a rectangular area monitoring system using radar, two radar sensors are placed at both ends of the vehicle. Therefore, the vehicle equipped with the rectangular area monitoring system does not need to separately include the radar sensor 110 for the vehicle door lock system of the present invention, thereby reducing the cost.

On the other hand, the occupant detection sensor 120 of the sensor unit 100 senses whether or not an occupant is seated in each seat of the vehicle, and transmits boarding detection information to the sensor control unit 130. FIG. 4 shows an example of the installation position of the occupant detection sensor in the vehicle door locking system of FIG. 1. As shown in FIG. 4, the occupant detection sensor 120 may be provided for each seat of the vehicle. Each of the occupant detection sensors 120 may be implemented by various sensors capable of detecting whether a passenger is seated. For example, the occupant detection sensor may be implemented as a pressure sensor.

The sensor control unit 130 receives the target information applied from the radar sensor 110 and grasps the position of the surrounding object, receives the boarding detection information applied from the occupant detection sensor 120, and determines the boarding position of the occupant . In this case, the sensor control unit 130 calculates the RCS (Radar Cross Section) of the target information provided by the radar sensor 110 and the power ratio of the wave reflected from the object, When the value of the wave reflected from the object is related to the size and wavelength of the object, the detection and tracking of the object can be performed. If the value of RCS And the type of the object to be detected based on the moving speed. Then, the system control unit 300 transmits the object information and the boarding position of the identified peripheral object to the system control unit 300.

The power source unit 200 includes a constant power source unit 210 and a power source control unit 220 to provide power for driving the vehicle door lock system. The constant power source unit 210 is electrically connected to the battery of the vehicle so that the electric power charged in the battery can be supplied even when the vehicle is not started. The power control unit 220 receives power from the constant power unit 210 and supplies power for driving the vehicle door lock system to a predetermined voltage. The power supply control unit 220 provides the power supplied from the constant power supply unit 210 to the vehicle door locking system so that the radar sensor or the occupant detection sensor can perform the sensing operation even when the vehicle is stopped or the vehicle is not started , The system control unit 300 can lock the door lock switch 400 or display a warning.

The system control unit 300 senses the state of the door lock switch 400 and drives the sensor unit 100 when the door lock switch 400 receives a state signal of the open state. The sensor unit 100 performs a sensing operation to receive the object information and the boarding position transmitted from the sensor control unit 130. The system control unit 300 analyzes the received object information and the boarding position, and transmits a lock command to the door lock switch 400 according to the analysis result to switch the door lock switch 400 to the locked state. Also, the system control unit 300 transmits notification information including the state of the door lock switch and object information to the HMI unit 510.

The door lock switch 400 is a switch provided to lock the vehicle door. When the door lock switch is in the locked state, the vehicle door is not opened or closed. The door lock switch 400 may be manually switched to a locked state or an open state by a passenger, and may be switched to a locked state or an opened state in response to a lock command or an open command applied by the system control unit 300. Then, the door lock switch 400 transmits a status signal to the system control unit 300 at the time of status change.

The interface unit 500 includes an HMI (Human Machine Interface) unit 510 and a warning output unit 520, and outputs a warning and guidance to the passenger about the door lock.

The HMI unit 510 is a marking device for indicating the state of the vehicle, and is provided in most vehicles. The HMI unit 510 receives notification information from the system control unit 300 and controls the alarm output unit 520 according to the received notification information.

The alarm output unit 520 may include a dashboard or a speaker provided in the vehicle. The alarm output unit 520 may be controlled by the HMI unit 510 to alert the occupant visually and audibly to the door lock state and the approaching object Output. It is possible to visually display the door lock state corresponding to the state of the door lock switch 400 on the instrument panel and audibly display whether the door is locked or the presence of an approaching object through the speaker. Further, in the case of the existing instrument panel, there is a limitation that only the driver can easily recognize it. Therefore, the warning output unit 520 further includes an additional device such as an operation indicator that outputs an alarm so that the occupant can recognize the door lock state and the approaching object can do.

Fig. 5 shows an example of the mounting position of the operation indicator in the vehicle door locking system of Fig. 1. Fig.

As shown in Fig. 5, when the warning output unit 520 is provided with the operation indicator lamp in the side mirror of the vehicle, not only the driver but also other passengers can easily recognize the door lock state and the approaching object. Also, outside persons other than the occupant in the vehicle can also confirm whether or not the vehicle occupant is ready to get off. In FIG. 5, for example, the operation indicator is disposed on the side mirror. However, the arrangement position of the operation indicator may be variously changed, or a plurality of the operation indicator may be provided.

Figs. 6 to 9 show the detection results of the objects detected in the radar for the vehicle.

6 to 9, the sensor control unit 130 determines whether the value of the RCS among the target information provided by the radar sensor 110 is equal to or greater than a preset reference value The detection and tracking of the object is performed and the type of the object to be detected is determined based on the RCS value and the moving speed of each object to be tracked.

FIG. 6 shows changes in RCS and distance sensed by the radar sensor 110 when an adult male with a height of 170 cm approaches. FIG. 7 shows changes in RCS and distance detected by the radar sensor 110 when the motorcycle approaches And FIG. 8 shows a change in the RCS and the distance sensed when the passenger car approaches. And Figure 9 shows the detected RCS and distance change when the van approaches.

The difference in RCS values for these materials is due to the fact that RCS has different values depending on the medium of the object, and the size of the waves reflected from the object is related to the size and wavelength of the object.

It is not necessary for the radar sensor 110 and the sensor control unit 130 of the present invention to analyze and grasp the type of the object to be accessed. However, if the occupant can identify the target to be noticed at the time of getting off and inform the occupant, It becomes possible to cope with the situation outside the vehicle more flexibly. Particularly, among the detected objects of Figs. 6 to 9, there is a need to relatively clearly distinguish between people and vehicles.

Analysis of the difference between the detection result for the adult male of FIG. 6 and the detection result for the vehicle of FIGS. 7 to 9, the reference RCS for the adult male of FIG. 6 can be set to 1 dBsm, With 3dBsm, the passenger car of Fig. 8 can be set to 7 dBsm, and the van of Fig. 9 can be set to 10 dBsm. In addition, the maximum movable speed of a person can be set to 7 m / s.

According to the reference RCS and the reference moving speed thus set, the vehicle door locking system of the present invention can discriminate whether the approaching object is a person or a vehicle, and can display different types of warning to the passenger according to the discrimination result. For example, when a person approached, the alarm output unit 520 flickers the flashing interval of the operation indicator at a first time interval (for example, 0.5 seconds) The blinking interval can be flickered at a second time interval (for example, 0.2 seconds). It is also possible to output the voice of the vehicle or a person approaching the vehicle.

10 shows detection and tracking results for a plurality of moving targets in a vehicle radar.

In FIGS. 6 to 9, detection results of individual objects detected by the radar sensor 110 are shown. However, as shown in FIG. 10, the radar sensor 110 can detect and identify a plurality of objects at the same time. Therefore, even when there are a plurality of objects to be accessed, the object can be easily identified, the door can be locked, and a warning can be output.

11 shows a door control method of a vehicle door locking system according to an embodiment of the present invention.

Referring to FIG. 1, the door control system of FIG. 11 will be described. When the vehicle door lock system is operated, the power control unit 220 controls the power supply unit 210 And the system control unit 300 operates the radar sensor 110 and the occupant detection sensor 120 of the sensor unit 100 with the applied power (S11). The system controller 300 receives a status signal from the door lock switch 400 and determines whether the door lock switch 400 is in an open state (S12). As a result of the determination, if the door lock switch 400 is locked, no separate operation is performed. However, if the door lock switch 400 is in the open state or the open state, the system control unit 300 determines whether an object is detected within the detection area of the radar sensor 110 (S13). Whether or not an object is detected within the detection area of the radar sensor 110 is determined by whether the RCS analyzed by the radar sensor 110 is equal to or greater than a preset reference value. If an object is detected within the radar detection area, the seating position of the occupant detected by the occupant detection sensor 120 is detected (S14). Then, it is determined whether the detected position of the object corresponds to the boarding position of the occupant (S15). The reason for detecting the seating position of the occupant is that the direction in which the occupant descends from the vehicle is determined according to the seating position of the occupant. It is not necessary to lock the door of all the vehicles because the object is detected by the radar sensor 110. For example, when an object approaches the left side of the vehicle, if the occupant gets off the right side of the vehicle, there is no need to lock the right door of the vehicle.

If the detected position of the object corresponds to the boarding position of the occupant, the system control unit 300 determines whether the RCS of the detected object is within the reference RCS (S16). Here, the reference RCS is a value set for distinguishing a detected object as a person and a vehicle. As described above, the reference RCS can be set to, for example, 1 dBsm, and the movement speed can be additionally determined. In the case of determining the moving speed together, the reference moving speed can be set to 7 m / s, for example.

When the RCS of the detected object is determined to be within the reference RCS, the system control unit 300 controls the interface unit 500 to switch the door lock switch 400 to the locked state, and a first warning indicating that the person is approaching (S17). If the RCS of the detected object is not within the reference RCS, the system control unit 300 controls the interface unit 500 to switch the door lock switch 400 to the locked state, and outputs a second warning indicating that the vehicle is approaching (S18). Where the first warning and the second warning can be output as visual and auditory signals of different patterns.

If an object is not detected within the radar detection area, or if the detected position does not correspond to the seating position, the door lock switch 400 determines whether the vehicle door lock system is forcibly locked (S19). If the forced lock operation is in progress, the forced lock and warning output are released (S20). Then, the door lock switch 400 is switched to the open state (S21). On the other hand, if the door lock switch 400 is not in the forced lock operation, the door lock switch 400 is kept open (S21).

As described above, according to the present invention, a radar sensor can be used to detect objects in the vicinity of a vehicle, and the door lock switch can be forcibly locked in consideration of the occupant's boarding position. Therefore, it is possible to prevent an accident caused by carelessness of the occupant when the vehicle gets off.

The method according to the present invention can be implemented as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (for example, transmission via the Internet). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (9)

A sensor unit having a radar sensor and detecting an object approaching the vehicle;
A plurality of door lock switches corresponding to each of the vehicle doors for locking and unlocking the vehicle door;
An interface unit for alerting an occupant of the vehicle to an approach of an object detected by the sensor unit; And
A system controller for controlling the door lock switch to a locked state according to a position and a speed of an object detected by the sensor unit and outputting a warning through the interface unit; And a door lock system. The apparatus of claim 1, wherein the sensor unit
A plurality of occupant detection sensors for discriminating the seating position of the occupant in the vehicle; And
A radar sensor for detecting a position and a moving speed of the object, tracking the identified object, receiving object information generated from the object information, and boarding detection information from each of the plurality of the occupant detection sensors, A sensor controller for transmitting boarding position information to the system controller; The door lock system further comprising: 3. The apparatus of claim 2, wherein the system control unit
When the approach direction of the object determined from the object information is a direction corresponding to the boarding position information from the sensor control unit, and when the approach direction of the object determined from the object information corresponds to the boarding position information, Wherein the door lock switch is in a locked state. 4. The apparatus of claim 3, wherein the system control unit
Wherein the controller analyzes the RCS and the moving speed of the radar sensor detected by the radar sensor from the object information and outputs the different types of warning through the interface unit by distinguishing the object according to the analyzed RCS. Door lock system. 5. The apparatus of claim 4, wherein the interface
A warning output unit for visually and audibly displaying that the door lock switch is forcibly locked to the occupant and a person outside the vehicle; And
An HMI unit for receiving alarm information from the system control unit and controlling the alarm output unit according to the alarm information to output a warning; And a door lock mechanism for locking the vehicle door. The vehicle door lock system according to claim 1, wherein the vehicle door lock system
Wherein the vehicle door lock system is driven by receiving power from a constant power source unit provided in the vehicle irrespective of whether the vehicle is started or not. A control method of a vehicle door lock system including a sensor unit having a radar sensor, a plurality of door lock switches, an interface unit, and a system control unit,
The system control unit activating the sensor unit to drive the radar sensor;
Determining whether at least one door lock switch of the plurality of door lock switches is in an open state and determining whether an object is detected by the radar sensor when the door lock switch is in an open state;
Controlling the at least one door switch of the plurality of door lock switches to the forced lock state according to the detected position and velocity of the object when the system controller determines that an object approaching the vehicle from the radar sensor is detected ; And
Outputting a warning to the occupant in the vehicle through the interface unit; And a control unit for controlling the vehicle door lock system. The apparatus as claimed in claim 7, wherein the sensor unit
Further comprising a plurality of occupant detection sensors for discriminating the seating position of the occupant in the vehicle,
The step of controlling the at least one door switch to a locked state
Determining whether a seating position of an occupant detected by the plurality of occupant detection sensors corresponds to an approach direction of the object; And
Controlling a door lock switch corresponding to a seating position of the occupant out of the plurality of door lock switches to a forced lock state when the seating position corresponds to the approach direction of the object; And a control unit for controlling the door lock system. 8. The method of claim 7, wherein outputting the alert comprises:
Analyzing the RCS and the moving speed of the object sensed by the radar sensor and separating the object according to the analyzed RCS; And
Outputting the alerts of different types according to the distinguished RCS; And a control unit for controlling the door lock system.

Images