CN106274792B

CN106274792B - Seatbelt unfastening warning system and method for vehicle

Info

Publication number: CN106274792B
Application number: CN201510236257.1A
Authority: CN
Inventors: 葛亮
Original assignee: Autoliv Development AB
Current assignee: Autoliv Development AB
Priority date: 2015-05-11
Filing date: 2015-05-11
Publication date: 2020-03-06
Anticipated expiration: 2035-05-11
Also published as: CN106274792A

Abstract

The invention provides a seatbelt unfastening warning system and method for a vehicle. The safety belt unfastening early warning system comprises: a tongue for a seat belt, the tongue having an RFID tag mounted thereon; the mortise lock for the safety belt is characterized in that the bolt can be inserted into the mortise lock to enter a safety belt fastening state and can be pulled out of the mortise lock to enter a safety belt unfastening state, and when the bolt is inserted into the mortise lock, the mortise lock shields the RFID tag through signals; and a keyless entry system for unlocking the vehicle door upon detection of a predetermined response signal within a predetermined range of the surroundings, and also for near field communication with the RFID tag, the keyless entry system including an identifier for transmitting an RF signal and detecting a response of the RFID tag to the RF signal within the predetermined range; and a controller for determining whether to activate an alarm based on the response, wherein the controller activates a seatbelt unfastened alarm indicating that the seatbelt is in an unfastened state when the response is detected by the identifier.

Description

Seatbelt unfastening warning system and method for vehicle

Technical Field

The invention relates to a seatbelt unfastening warning system and method for a vehicle.

Background

Vehicles are currently the vehicle of choice for many people, but in many accidents, irreparable losses are caused by the absence of a safety harness by vehicle occupants (e.g., the driver and/or other occupants). Therefore, the conventional automobile is basically mounted with a seatbelt unfastening warning device which warns a vehicle passenger of an unfastening of a seatbelt by, for example, a horn on an instrument panel or by a blinking indication of a warning lamp on the instrument panel. Such a seatbelt unfastening warning device usually has a switch provided in a mortise lock of the seatbelt, and when a seatbelt tongue is inserted into the mortise lock, the switch is activated, so that the seatbelt unfastening warning is stopped. However, in actual use, some users use an extra deadbolt buckle in the belt latch in addition to the belt to fool the meter so that the belt unfastening alarm device loses its intended function.

To solve this problem, for example, chinese patent application publication CN103847687A discloses a seatbelt unfastening warning device comprising a chip mounted on a tongue of a seatbelt, and a switch receiver mounted on a mortise lock of a seatbelt seat, wherein when the switch receiver detects that the tongue is inserted into the mortise lock and detects a normal signal of the chip on the tongue, the switch receiver sends a signal to a controller to turn off a warning lamp or stop a warning.

However, such a seatbelt-unfastened warning system requires additional wiring, triggering devices and control devices between the mortise lock and the switch device, between the switch device and the instrument panel, etc. to transmit signals and implement control, which increases the complexity and production cost of the seatbelt-unfastened warning system and ultimately the complexity and cost of the vehicle. In addition, in order to reduce cost, some vehicles adopt not to set up the scheme that the early warning system was not tied to the safety belt to the back row seat, and this makes the back row passenger dredge in tying the safety belt, brings the potential safety hazard that back row vehicle passenger injured the risk increase in the vehicle accident.

Therefore, it is desirable to have a seatbelt unfastening warning system for a vehicle that is easily adaptable to all seats in the vehicle, has high reliability, and is low cost.

Disclosure of Invention

The invention provides a novel safety belt unfastening early warning system for a vehicle, which utilizes a keyless entry system commonly installed in the vehicle, only needs to arrange an RFID tag on a bolt of the safety belt and enables the RFID tag to carry out near field communication with the existing keyless entry system in the vehicle to transmit signals, and does not need to arrange a wiring or an additional communication system on a vehicle body, so the cost is relatively low. The present invention also provides a seatbelt unfastening warning method for a vehicle performed by the seatbelt unfastening warning system for a vehicle.

According to an embodiment of the present invention, there is provided a seatbelt unfastening warning system for a vehicle, including: a tongue for a seat belt, the tongue having an RFID tag mounted thereon; a mortise lock for a seat belt, the tongue being insertable into the mortise lock into a seat belt fastened state and extractable from the mortise lock into a seat belt unfastened state, and the mortise lock signal-shielding the RFID tag when the tongue is inserted into the mortise lock; and a keyless entry system for unlocking the vehicle door upon detection of a predetermined reply signal within a predetermined range of the surroundings, and also for near field communication with the RFID tag, the keyless entry system comprising an identifier for transmitting an RF signal and detecting a reply of the RFID tag to the RF signal within the predetermined range; and a controller for determining whether to activate an alarm based on the response, wherein the controller activates a seatbelt unfastened alarm prompting that a seatbelt is in a seatbelt unfastened state when the response is detected by the identifier.

According to a preferred embodiment of the present invention, the identifier may further transmit an RF signal and detect a response of the RFID tag to the RF signal in response to the unlocking of the door, and the controller may determine whether the number and codes of the RFID tags having responded correspond to the preset values and codes of the keyless entry system based on the response of the RFID tag.

According to a preferred embodiment of the present invention, the controller may activate a seat belt malfunction alarm for notifying that there is a malfunction of a seat belt when the number or code of the RFID tags does not correspond to a preset value or code of the keyless entry system.

According to a preferred embodiment of the present invention, the seatbelt unfastened warning system may further include: the vehicle speed sensor is used for detecting the vehicle speed; and a seat state sensor for detecting whether a passenger is present on the vehicle seat.

According to a preferred embodiment of the present invention, the identifier may periodically transmit an RF signal when the vehicle speed is greater than a predetermined value and the seat sensor detects the presence of a passenger in the vehicle seat, and the controller may activate a seatbelt unfastened alarm when the identifier detects a response from the RFID tag corresponding to the vehicle seat in which the presence of a passenger is detected.

According to a preferred embodiment of the present invention, when the locking tongue is inserted into the mortise lock, the RFID tag may be directly signal-shielded by a metal part included in the mortise lock.

According to the preferred embodiment of the present invention, when the locking bolt is inserted into the mortise lock, the RFID tag may be signal-shielded by a metal coating applied inside the mortise lock.

According to another embodiment of the present invention, there is provided a seatbelt unfastening warning method for a vehicle, which utilizes: a tongue for a seat belt, the tongue having an RFID tag mounted thereon; a mortise lock for a seat belt, the tongue being insertable into the mortise lock into a seat belt fastened state and extractable from the mortise lock into a seat belt unfastened state, and the mortise lock signal-shielding the RFID tag when the tongue is inserted into the mortise lock; and a keyless entry system for unlocking the door upon detection of a predetermined answer signal within a predetermined range in the vicinity of the vehicle, the seatbelt unfastening warning method comprising the steps of: transmitting an RF signal using an identifier of the keyless entry system and detecting a response of the RFID tag to the RF signal within the predetermined range; determining whether to activate an alarm based on the response, wherein when the identifier detects the response, activating a seatbelt unfastened alarm prompting that the seatbelt is in a seatbelt unfastened state.

According to a preferred embodiment of the present invention, the seatbelt unfastening warning method may further include the steps of: unlocking the vehicle door by using a keyless entry system; and in response to unlocking of the vehicle door, enabling the identifier to transmit an RF signal and detect the response of the RFID tag to the RF signal, and determining whether the number and the code of the RFID tags which have responded correspond to the preset numerical value and the code of the keyless entry system or not based on the response of the RFID tag, wherein when the number or the code of the RFID tags do not correspond to the preset numerical value or the code of the keyless entry system, a safety belt fault alarm prompting that a safety belt is in fault is started.

According to a preferred embodiment of the present invention, the seatbelt unfastening warning method may further include the steps of: detecting the speed of the vehicle; detecting whether a passenger is on a vehicle seat; causing the identifier to periodically transmit an RF signal when the detected vehicle speed is greater than a predetermined value and a passenger is detected in a vehicle seat, and activating a seatbelt-unfastened alarm when the identifier detects a response from the RFID tag corresponding to the vehicle seat in which the passenger is detected.

According to the early warning system and the early warning method for unfastening the safety belt, a keyless entry system which is common in vehicles at present is utilized, extra wiring is not required to be arranged, the structure is simple, the cost is low, and the early warning system and the early warning method for unfastening the safety belt are suitable for safety belts of all seats in the vehicles.

Drawings

Fig. 1 shows an example of a vehicle to which the seatbelt unfastened warning system and method of the present invention is applied.

Fig. 2 shows an example of a seat belt employed by the seat belt unfastening warning system and method according to the present invention.

Fig. 3 shows a schematic diagram of a seatbelt unfastened warning system according to an exemplary embodiment of the present invention.

Fig. 4 shows a flowchart of a seatbelt unfastened warning method according to an exemplary embodiment of the present invention.

Fig. 5 shows a flow chart of a seatbelt unfastened warning method according to another embodiment of the present invention.

Detailed Description

Hereinafter, specific embodiments of a seatbelt unfastening warning system and a seatbelt unfastening warning method according to the present invention will be described with reference to the accompanying drawings.

Vehicle with a steering wheel

Fig. 1 shows an example of a vehicle showing an application of the seatbelt unfastened warning system and method of the present invention.

Referring to fig. 1, the illustrated vehicle 10 is a conventional sedan type vehicle, and includes

front doors

11F and 11F,

rear doors

11R and 11R,

front seats

12F and 12F,

rear seats

12R and 12R, and a trunk 13. The vehicle 10 also includes a keyless entry system (not shown) that can send RF signals to the surroundings and unlock the doors upon detecting a predetermined reply signal within a predetermined range of the surroundings. The antenna of the keyless entry system may be installed, for example, near the handle of any of the vehicle doors or at the trunk, etc., so that its signal can cover a predetermined range of the surroundings. In the vehicle 10, a plurality of seats are included, each seat containing a corresponding seat belt. As for the specific structure of the seat belt, it will be described below.

Safety belt

Referring to fig. 2, the seatbelt 20 includes a latch tongue 21 and a mortise lock 22, and the latch tongue 21 can be inserted into the mortise lock 22 into a seatbelt buckled state and can be withdrawn from the mortise lock 2 into a seatbelt unbuckled state. According to an embodiment of the present invention, the latch bolt 21 is mounted with an RFID (radio frequency identification) tag 23. The RFID tag 23 may be in near field communication with the keyless entry system, i.e., when the keyless entry system emits an RF signal of a specific frequency, the RFID tag 23 may be excited by the RF signal and transmit data for the keyless entry system to receive.

Further, when the tongue 21 is inserted into the mortise lock 23, the mortise lock 23 can perform signal shielding of the RFID tag 23. Signal shielding may be achieved in a variety of ways, for example, a metal part that interferes with the electromagnetic field may be disposed in the mortise lock 22, and the metal part may directly shield the RFID tag 23 from the signal when the locking tongue 21 is inserted into the mortise lock 22. Alternatively, a shielding material (e.g., a metal coating) is coated inside the mortise lock 22, and the shielding material may shield the RFID tag 23 from a signal when the locking tongue 21 is inserted into the mortise lock 22.

Safety belt unfastening early warning system

Hereinafter, a seatbelt unfastening warning system according to an exemplary embodiment of the present invention will be described in detail with reference to fig. 1 to 3.

Fig. 3 shows a schematic overview of a seatbelt unfastened warning system 100 according to an exemplary embodiment of the present invention.

Referring to fig. 3, a seatbelt unfastening warning system 100 according to an exemplary embodiment of the present invention includes a plurality of locking tongues 21 for a seatbelt, a plurality of mortise locks 22 provided in one-to-one correspondence with the locking tongues 21, and a keyless entry system 30.

The keyless entry system 30 transmits an RF signal via an antenna and detects the response of an RFID chip (e.g., a contactless smart card, typically a vehicle smart key card) to the RF signal, wherein certain functions are implemented when the keyless entry system 30 detects a predetermined response signal within a predetermined range of the surroundings, e.g., locking/unlocking the doors of a vehicle upon detecting a predetermined corresponding signal from the smart key card, etc., as previously described. Since the signal detection range of the keyless entry system can generally cover all seats in the vehicle, in the present invention, the keyless entry system is used to transmit an RF signal, perform near field communication with the RFID tag 23 on the tongue 21, and detect whether the seat belt is fastened or not by using the response of the RFID tag 23, thereby realizing a warning that the seat belt is unfastened.

Specifically, in an exemplary embodiment of the present invention, the keyless entry system 30 includes an identifier 31 and a controller 32. The identifier 31 is used to transmit an RF signal and detect a response to the RF signal from the RFID tag 23 within a predetermined range, and the controller 32 is used to determine whether to activate an alarm based on the response. For example, since the mortise 22 shields the RFID tag 23 on the tongue 21 when the tongue 21 of the seat belt is inserted into the mortise 22, when the identifier 31 detects the response of the RFID tag 23 to the RF signal, which indicates that the tongue 21 of the seat belt is not inserted into the mortise 22, the controller 32 activates the alarm device 60 to indicate that the seat belt in the unbuckled state is unbuckled. The alarm device 60 may be, for example, a speaker that emits an audible indication, a light that emits a light indication, or a display screen on the dashboard.

In addition, in order to prevent the seat belt unfastening alarm from being erroneously issued in a parking state of the vehicle or to prevent the corresponding seat belt of a seat having no passenger actually from being erroneously issued, the exemplary embodiment of the present invention may further include other components to cope with these problems. Referring again to fig. 1, the seatbelt unfastened warning system 100 may further include: a vehicle speed sensor 40 for detecting a vehicle speed; and a seat state sensor 50 for detecting whether or not a passenger is present on the vehicle seat. The controller 32 of the keyless entry system 30 receives detection results from the vehicle speed sensor 40 and the seat state sensor 50, respectively, and compares the vehicle speed detected by the vehicle speed sensor 40 with a predetermined value set in the controller. When the vehicle speed is greater than the predetermined value, it is considered that the vehicle is running, and therefore there is a need for the seatbelt buckle. Therefore, when the vehicle speed is greater than the predetermined value and when the detection result from the seat state sensor 50 indicates that a passenger is present in the vehicle seat, it indicates that the seatbelt corresponding to the seat is necessary to be buckled; in this case, the identifier 31 of the keyless entry system 30 may be caused to periodically transmit the RF signal. When the identifier 31 detects a response from the RFID tag 23 corresponding to the vehicle seat in which the passenger is detected, it indicates that the lock tongue 21 of the seat belt corresponding to the vehicle seat in which the passenger is detected is not inserted into the mortise lock 22, and the controller 32 activates the seat belt unfastening alarm.

In addition, in another embodiment of the present invention, an initial check of the RFID tag included in the seatbelt lock tongue corresponding to each seat may be performed when a passenger is about to enter the vehicle. For example, when the identifier 31 of the keyless entry system 30 detects an unlock from a smart key card reply, it is considered that a passenger is about to enter the vehicle, and the seat belts in the vehicle should all be in an unfastened state. Therefore, the identifier 31 may be set to further transmit an RF signal for the RFID tag 23 of the seatbelt lock tongue in response to the door unlocking, and detect the response of the RFID tag 23 to the RF signal, and the controller 32 determines whether the number and code of the RFID tags 23 having responded correspond to the preset values and codes in the keyless entry system 30 based on the response of the RFID tag 23. When the number or code of RFID tags 23 does not correspond to the value or code preset by keyless entry system 30, indicating that some malfunction or obstruction may be present, e.g., one or more of RFID tags 23 may not respond properly, etc., controller 32 initiates a belt malfunction alarm that indicates that the belt may be malfunctioning.

According to the safety belt unfastening early warning system, the wiring is not required to be arranged on the vehicle body to transmit the RF signal, the RFID tag with low cost is simply added on the bolt of the safety belt, and the recognizer of the conventional keyless entry system is adjusted, so that the near field communication can be carried out between the recognizer and the RFID tag installed on the bolt of the safety belt. Therefore, the early warning system for the unbuckled safety belt can avoid the situation that a user deceives the early warning system for the unbuckled safety belt by using an additional bolt except the safety belt, and meanwhile, the number of wires arranged on the body of a vehicle is reduced, the production cost is reduced, and the weight of the vehicle is also reduced. In addition, the antenna of the identifier of the keyless entry system, which is commonly used at present, is usually disposed at a door handle, a trunk, or the like, and the reading range thereof can well cover all seats of the vehicle, so that the unfastening warning function can be provided to the seat belts of all the seats at low cost, and the safety of the rear-row passenger is improved compared with the scheme that the seat belt unfastening warning is not provided to the rear-row seat in the prior art.

Safety belt unfastening early warning method

Next, the seatbelt unfastening warning method performed by the seatbelt unfastening warning system 100 described above will be described in detail with reference to fig. 4 and 5.

Referring to fig. 4, in step 410, an RF signal is transmitted using the identifier 31 of the keyless entry system 30 and the response of the RFID tag 23 of the seatbelt lock tongue within a predetermined range to the RF signal is detected. In step S420, it is determined whether to activate an alarm based on the response. Specifically, for example, when the RFID tag 23 detects an RF signal from the identifier 31, it is assumed that the tongue 21 of the seatbelt is not inserted into the mortise 22, and therefore, the controller 32 of the keyless entry system 30 activates a seatbelt unfastening alarm indicating that the seatbelt is in the unfastened state.

According to the safety belt unfastening early warning method, the recognizer of the keyless entry system and the RFID tag installed on the bolt of the safety belt are used for carrying out near field communication to transmit signals, so that the safety belt unfastening early warning is realized. Therefore, with a simple and reliable control method, the number of wiring arranged on the vehicle body is reduced, the production cost is reduced, and the vehicle weight is also reduced while the condition that a user uses an additional bolt except for the safety belt to deceive that the safety belt is not tied to the early warning system is avoided.

Fig. 5 shows a flow chart of a seatbelt unfastened warning method according to another embodiment of the present invention. The seatbelt unfastening warning method shown in fig. 5 is a further improvement of the seatbelt unfastening warning method shown in fig. 4, and improves the accuracy of the seatbelt unfastening warning of the vehicle.

Referring to fig. 5, in step S510, the door is unlocked using the keyless entry system 30.

In step S520, in response to the door being unlocked, it is considered that a passenger is about to enter the vehicle, and therefore the identifier 31 is caused to transmit an RF signal and detect the response of the RFID tag 23 to the RF signal.

In step S530, it is determined whether the number and code of the RFID tags 23 to which the response is made correspond to the numerical values and codes preset in the keyless entry system 30, based on the received response of the RFID tags 23. Since the passenger has not yet entered the vehicle at this time, the seat belt should be in an unfastened state, and therefore, the RFID tag 23 on the tongue of the seat belt is not shielded by the latch of the seat belt, but should respond to the RF signal. When the number or codes of the RFID tags 23 that have responded do not correspond to the preset values or codes of the keyless entry system 30, it indicates that there may be a failure related to the seatbelt warning system, for example, one or more of the RFID tags 23 are blocked or cannot work normally, the identifier has a failure to transmit an RF signal, etc., and the controller 32 starts a seatbelt failure alarm that indicates that there is a failure in the seatbelt; on the contrary, when the number and the code of the RFID tags 23 correspond to both the preset value and the preset code of the keyless entry system 30, the flow advances to step S540.

In step S540, the vehicle speed is detected by the vehicle speed sensor 40 and whether or not a passenger is present in the vehicle seat is detected by the seat state sensor 5. When the detected vehicle speed is greater than the predetermined value and the presence of a passenger in the vehicle seat is detected, it proceeds to step S550. Otherwise, when the detected vehicle speed is equal to or less than the predetermined value or whether a passenger is not detected in the vehicle seat, step S540 is repeated.

In step S550, since it is detected in step S540 that the vehicle speed is greater than the predetermined value and that the passenger is in the vehicle seat, it is considered that the passenger in the corresponding seat should fasten the seat belt, so that the identifier 31 periodically transmits the RF signal and detects the response of the RFID tag 23 to the RF signal. When the identifier 31 detects a response from the RFID tag 23 corresponding to the vehicle seat in which the passenger is detected, it is considered that the seatbelt lock tongue corresponding to the vehicle seat in which the passenger is detected is not inserted into the mortise lock, and the flow proceeds to step S560. When the identifier 31 fails to detect a response from the RFID tag 23 corresponding to the vehicle seat in which the passenger is detected, it is considered that the corresponding seat belt is fastened, and thus step S550 is repeated.

In step S560, the controller 32 activates the seatbelt unfastened alarm.

According to the embodiment of the seatbelt unfastening warning method described with reference to fig. 5, the identifier of the keyless entry system is used to perform near field communication with the RFID tag mounted on the tongue of the seatbelt to transmit a signal, thereby implementing the seatbelt unfastening warning. With a simple and reliable control method, when a user is prevented from deceiving that the safety belt is not fastened with the early warning system by using an additional bolt except the safety belt, the number of wiring arranged on the body of the vehicle is reduced, the production cost is reduced, and the weight of the vehicle is also reduced.

In addition, according to the embodiment of the seat belt unfastening warning method described with reference to fig. 5, the RFID tag of the seat belt is initially detected in response to the door unlocking action of the keyless entry system, and a possible fault is prompted, so that the reliability of the system is improved.

In addition, according to the embodiment of the seatbelt unfastening warning method described with reference to fig. 5, in the case where it is determined that the vehicle is traveling and a passenger is present on the seat, seatbelt unfastening warning is performed for the corresponding seat, so that the accuracy of the system operation is improved, and the comfort of the passenger is improved.

Other embodiments

As described above, although some exemplary embodiments have been described with respect to the seatbelt unfastened warning system and method of the present invention with reference to the accompanying drawings, the present invention is not limited to these specific embodiments, but various other embodiments are possible.

For example, it is described with reference to fig. 1 that the vehicle to which the present invention is applied is a passenger car, and a seatbelt unfastened warning is applied for each seat. However, the present invention may be applied to any vehicle having a passenger seat and a seat belt, and the number of the seat belts is not limited, and may be one or a plurality of. In addition, for a vehicle having a plurality of seats and corresponding seat belts, the seat belt unfastening warning technique of the present invention may be applied only to a part of the seats, that is, the RFID tag may be provided only to the seat belt tongue corresponding to a part of the seats.

For example, in the above-described embodiment, the keyless entry system is installed in a door, a trunk, or the like, and all seats can be covered with its read range of the smart key card, but the present invention is not limited thereto, and the installation position of the keyless entry system is not particularly limited, and the installation position, the installation position and the arrangement of the antenna, and the like can be adjusted to cover a predetermined seat for which a seatbelt unfastening warning is required.

For example, in the foregoing embodiments, examples are given of the manner in which the RFID tag on the tongue is shielded from the signal when the seat belt tongue is inserted into the mortise lock, but the structure and manner of signal shielding are not limited thereto, and other possible embodiments may be adopted.

As described above, although the exemplary embodiments of the present invention have been described in the description with reference to the drawings, the present invention is not limited to the above-described embodiments, and the scope of the present invention should be defined by the claims and their equivalents.

Claims

1. A seatbelt unfastening warning system for a vehicle comprising:

a tongue for a seat belt, the tongue having an RFID tag mounted thereon;

a mortise lock for a seat belt, the tongue being insertable into the mortise lock into a seat belt fastened state and extractable from the mortise lock into a seat belt unfastened state, and the mortise lock signal-shielding the RFID tag when the tongue is inserted into the mortise lock; and

a keyless entry system for unlocking a vehicle door upon detection of a predetermined reply signal within a predetermined range of the surroundings and for near field communication with the RFID tag, the keyless entry system comprising

An identifier for transmitting an RF signal and detecting a response of the RFID tag to the RF signal within the predetermined range; and

a controller for determining whether to activate an alarm based on the response, wherein the controller activates a seatbelt unfastened alarm indicating that a seatbelt is in an unfastened state when the response is detected by the identifier.

2. The seatbelt unfastened warning system for a vehicle according to claim 1,

also in response to the unlocking of the door, the identifier transmits an RF signal and detects a response of the RFID tag to the RF signal, and the controller determines whether the number and code of the RFID tags having responded correspond to a preset value and code of the keyless entry system based on the response of the RFID tag.

3. The seatbelt unfastened warning system for a vehicle according to claim 2,

and when the number or the code of the RFID tags does not correspond to the preset numerical value or the code of the keyless entry system, the controller starts a safety belt fault alarm for prompting that the safety belt has a fault.

4. The seatbelt unfastened warning system for a vehicle according to any one of claims 1 to 3, further comprising:

the vehicle speed sensor is used for detecting the vehicle speed; and

and the seat state sensor is used for detecting whether a passenger is on the vehicle seat.

5. The seatbelt unfastened warning system for a vehicle according to claim 4,

the identifier periodically transmits an RF signal when a vehicle speed is greater than a predetermined value and the seat sensor detects the presence of a passenger on the vehicle seat, and the controller activates a seatbelt unfastened alarm when the identifier detects a response from the RFID tag corresponding to the vehicle seat in which the presence of the passenger is detected.

6. The seatbelt unfastened warning system for a vehicle according to claim 1,

when the bolt is inserted into the mortise lock, the metal part included in the mortise lock directly shields the RFID tag.

7. The seatbelt unfastened warning system for a vehicle according to claim 1,

when the bolt is inserted into the mortise lock, the RFID tag is shielded by a metal coating coated in the mortise lock.

8. A seatbelt unfastening warning method for a vehicle, which utilizes: a tongue for a seat belt, the tongue having an RFID tag mounted thereon; a mortise lock for a seat belt, the tongue being insertable into the mortise lock into a seat belt fastened state and extractable from the mortise lock into a seat belt unfastened state, and the mortise lock signal-shielding the RFID tag when the tongue is inserted into the mortise lock; and a keyless entry system for unlocking the vehicle door upon detection of a predetermined answer signal within a predetermined range in the vicinity of the vehicle, the method comprising the steps of:

transmitting an RF signal using an identifier of the keyless entry system and detecting a response of the RFID tag to the RF signal within the predetermined range;

determining whether to activate an alarm based on the response, wherein when the identifier detects the response, activating a seatbelt unfastened alarm prompting that the seatbelt is in a seatbelt unfastened state.

9. The seatbelt unfastening warning method for a vehicle according to claim 8, further comprising the steps of:

unlocking the vehicle door by using a keyless entry system;

and in response to unlocking of the vehicle door, enabling the identifier to transmit an RF signal and detect the response of the RFID tag to the RF signal, and determining whether the number and the code of the RFID tags which have responded correspond to the preset numerical value and the code of the keyless entry system or not based on the response of the RFID tag, wherein when the number or the code of the RFID tags do not correspond to the preset numerical value or the code of the keyless entry system, a safety belt fault alarm prompting that a safety belt is in fault is started.

10. The seatbelt unfastening warning method for a vehicle according to claim 8 or 9, further comprising the steps of:

detecting the speed of the vehicle;

detecting whether a passenger is on a vehicle seat;

causing the identifier to periodically transmit an RF signal when the detected vehicle speed is greater than a predetermined value and a passenger is detected in a vehicle seat, and activating a seatbelt-unfastened alarm when the identifier detects a response from the RFID tag corresponding to the vehicle seat in which the passenger is detected.