TR2023018104A2

TR2023018104A2 - A SEAT BELT WARNING SYSTEM

Info

Publication number: TR2023018104A2
Application number: TR2023/018104
Authority: TR
Inventors: Dal Nurcan
Original assignee: Türki̇ye'ni̇n Otomobi̇li̇ Gi̇ri̇şi̇m Grubu Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇
Filing date: 2023-12-22
Publication date: 2024-12-23

Abstract

Bu buluş, araçta emniyet kemerinin (2) takılıp takılmadığının kontrol edilmesini ve emniyet kemeri (2) takılmadığı durumda sesli ve görsel uyarı verilmesini sağlayan bir ikaz sistemi (1) ile ilgilidir.This invention relates to a warning system (1) that checks whether the seat belt (2) is fastened in the vehicle and provides an audible and visual warning in case the seat belt (2) is not fastened.

Description

TARIFNAME BIR EMNIYET KEMERI IKAZ SISTEMI Teknik Alan Bu bulus, araçta emniyet kemerinin takilip takilmadiginin kontrol edilmesini ve emniyet kemeri takilmadigi durumda sesli ve görsel uyari verilmesini saglayan bir ikaz sistemi ile ilgilidir. Önceki Teknik Araç içerisinde güvenlik amaçli kullanilan unsurlardan biri emniyet kemeridir. Emniyet kemeri ölümlü ve agir yaralanmali kazalarin en çok meydana geldigi çarpma/çarpismalarda yaralanmalarinin önüne geçmek için kullanilmaktadir. Her ne kadar 1992 yilinda emniyet kemeri kullanimi zorunlu hale getirilmis olsa bile hayat kurtarici özelligi olan emniyet kemerlerinin takilmasi için kontroller yapilmakta, sensörler kullanilmakta ve emniyet kemeri takilmadigi durumlarda ikazlar yapilmaktadir. Emniyet kemeri ikaz sistemlerini kandirmak için emniyet kemerleri koltuk arkasindan veya önünden bosa takilmakta ya da emniyet kemeri tokasina emniyet kemerinin bagli olmadigi diller takilmaktadir. Bu sayede ikaz sistemlerinin uyari vermesinin önüne geçilmektedir. Bu nedenle günümüzde emniyet kemerinin çekilmesi ile hareket eden sarim mekanizmalarinin kullanilmasi ile emniyet kemerinin takilip olup olmadiginin kontrol edilmesini ve takili olmadigi durumda uyari verilmesini saglayan çözümlere ihtiyaç duyulmaktadir. dokümaninda, emniyet kemeri takilmasi için ikaz verilmesini saglayan bir sistemden bahsedilmektedir. Söz konusu bulustaki sistemde bir emniyet kemerinin emniyet barina bagli olup olmadigini tespit eden bir optik sensör içerilmektedir. Emniyet kemeri emniyet çubuguna baglandiginda, isik çikintili kisimdan gelen isik kanca kismi tarafindan bloke edilmekte ve emniyet kemerinin emniyet çubuguna bagli oldugu algilanmaktadir. Emniyet kemeri emniyet çubuguna bagli degilse, emniyet kemerinin bagli olmadigi algilanmakta, isik çikintili parçadan gelen isik engellenmemekte ve kirmizi devriye isigi ve sesli alarm etkinlestirilmektedir. Teknigin bilinen durumunda yer alan CN102555982B sayili Çin patent dokümaninda, yolcunun emniyet kemerini dogru bir sekilde takip takmadiginin tespit edilmesini saglayan bir sistemden bahsedilmektedir. Söz konusu bulustaki sistemde bir CCD kamera, yolcunun emniyet kemeri takma durumunun görüntüsünü toplamakta, bir islemci görüntüyü islemekte ve önceden programlanmis algoritma araciligiyla sonucu elde etmektedir. Yolcunun kemer takip takmadigi, emniyet kemerini dogru takip takmadigi ve/veya yolcunun emniyet kemeri takili bir koltukta oturup oturmadigi tespit edilmekte ve isikli ve sesli bir alarm araciligiyla yolcuya emniyet kemerini dogru takmasi gerektigi hatirlatilmaktadir. Yolcu emniyet kemerini dogru taktiginda islemci emniyet kemerinin koordinatlarini algilamakta ve sesli ve isikli alarm alarmi durdurmaktadir. Bulusun Kisa Açiklamasi Bu bulusun amaci, emniyet kemer sarim mekanizmasindan alinan ölçüm degeri ile araçta emniyet kemerinin takilip takilmadiginin kontrol edilmesini ve emniyet kemeri takilmadigi durumda sesli ve görsel uyari verilmesini saglayan bir sistem gerçeklestirmektir. Bulusun diger amaci, araçta emniyet kemerinin bosa takildigi ya da yalanci emniyet kemeri dili kullanilarak hiç takilmadigi durumlarin tespit edilmesini ve toka üzerinden sesli ve/veya görsel uyari verilmesini saglayan bir sistem gerçeklestirmektir. Bulusun bir diger amaci, araç içerisinde emniyet kemeri tokasinin görünürlügünün artirilmasini ve güvenlik ekipmanlarinin etkinliginin artirilmasini saglayan bir sistem gerçeklestirmektir. Bulusun Ayrintili Açiklamasi Bu bulusun amacina ulasmak için gerçeklestirilen "Bir Emniyet Kemeri Ikaz Sistemi" ekli sekilde gösterilmis olup, bu sekil; Sekil 1. Bulus konusu bir emniyet kemeri ikaZ sisteminin görünüsüdür. Sekilde yer alan parçalar tek tek numaralandirilmis olup, bu numaralarin karsiliklari asagida verilmistir: 1. Sistem Emniyet kemeri Sarim mekanizmasi Sensör Uyari elemani Kontrol ünitesi Araçlarda yer alan emniyet kemerinin takili olup olmadiginin kontrol edilmesini ve emniyet kemeri takilmadigi durumlarda uyari verilmesini saglayan bulus konusu bir ikaZ sistemi (1), -araç üzerinde yer alan ve uç kisminda bir dil (3) bulunan en aZ bir emniyet kemeri -araç üzerinde yer alan ve emniyet kemerinin dil (3) bulunan ucundan takildigi en aZ bir toka (4), -araç üzerinde yer alan, emniyet kemerine (2) dil (3) bulunmayan diger ucundan baglanan ve emniyet kemerinin (2) tokaya dogru uzayip kisalmasini saglayan en az bir sarim mekanizmasi (5), -sarim mekanizmasi (5) üzerinde yer alan ve sarim mekanizmasindan (5) tokaya takilmak üzere açilan emniyet kemerinin (2) açilma mesafesini ölçmek üzere yapilandirilan en az bir sensör (6), -toka (4) üzerinde yer alan ve emniyet kemerinin (2) takilmadigi ya da düzgün takilmadigi durumlarda uyari vermek üzere yapilandirilan en az bir uyari elemani (7) ve -emniyet kemerinin (2) koltugun ön yüzeyinden ya da arka yüzeyinden bosa takilmasi durumundaki uzunlugunu kayit altinda tutmak, söz konusu degeri emniyet kemerinin (2) takilip takilmadigina karar verilmesi isleminde esik degeri olarak kullanmak, esik degerinin asilmasi ile emniyet kemerinin (2) takildigina karar vermek, aracin çalistirilmasi ile tetiklenmek ve sarim mekanizmasinin (5) üzerinde yer alan sensörden (6) emniyet kemerine (2) iliskin ölçüm verisi almak, söz konusu ölçümün sifir ile önceden belirlenen esik degeri arasinda olmasi durumunda emniyet kemerinin (2) hiç takilmadigi ya da düzgün takilmadigina karar vermek ve toka (4) üzerinde yer alan uyari elemani (7) ile ikaz verilmesini saglamak üzere yapilandirilan en az bir kontrol ünitesi (8) içermektedir. Bulus konusu sistemde (1) yer alan emniyet kemeri (2) bir ucundan tokaya (4) takilirken diger ucundan ise sarim mekanizmasinda (5) açilip kapanma hareketi yapmakta olup söz konusu hareketteki açilma uzunlugu sensör (6) araciligi ile ölçülmektedir. Emniyet kemeri (2) sürücüyü ya da yolcuyu sarmadan koltugun ön yüzünden ya da arka yüzeyinden geçirilerek tokaya (4) takildiginda bosa takilmis olarak kabul edilmektedir. Emniyet kemerinin (2) sürücüyü ya da yolcuyu sarmadan koltugun ön yüzünden ya da arka yüzeyinden geçirilerek bosa takildigi durumdaki uzunlugu referans degeri ya da esik degeri olarak kabul edilmektedir. Emniyet kemerinin (2) takilip takilmadiginin kontrol edilmesi için söz konusu esik deger kontrol edilmektedir. Bulus konusu sistemde (1) yer alan toka (4) dilin (3) takilmasi ile emniyet kemerini (2) gergin tutmaktadir. Toka (4) üzerinde emniyet kemerinin (2) takilmadigi durumlarda uyari verilmesini saglamak üzere bir isik kaynagi seklinde olan uyari elemani (7) yer almaktadir. Uyari elemani (7) ayrica sesli uyari da vererek sürücünün ya da yolcularin emniyet kemerini takmasi konusunda ikaz edilmesini saglamaktadir. Uyari elemani (7) ayrica gece gibi karanlik ortamlarda ikaz vererek sürücü ya da yolcunun tokayi (4) bulmasina yardimci olmak üzere yapilandirilmaktadir. Bulus konusu sistemde (1) yer alan sarim mekanizmasi (5) emniyet kemerinin (2) açilip kapanma hareketini kontrol etmekte olup üzerinde yer alan sensör (6) araciligi ile açildigi durumdaki uzunluk ölçüm verilerini almaktadir. Sarim mekanizmasinda (5) yer alan sensör (6) aracin çalistirilmasinin ardindan emniyet kemeri (2) tokaya (4) takili oldugu durumdaki uzunluk ölçüm bilgilerini kontrol ünitesi (8) ile paylasmak üzere yapilandirilmaktadir. Bu sayede önceden belirlenen esik degeri ile emniyet kemerinin takili oldugu durumdaki uzunluk ölçüleri karsilastirilabilmektedir. Bulus konusu sistemde (1) yer alan sensör (6) kontrol ünitesi (8) ile iletisimde olmak ve kurulan bu iletisim üzerinden aracin çalistirilmasi ile sarim mekanizmasindan (5) aldigi ölçüm verilerini kontrol ünitesi (8) ile paylasmak üzere yapilandirilmaktadir. Kontrol ünitesi (8) aldigi verileri esik degeri ile karsilastirarak emniyet kemerinin (2) takilip takilmadigina ya da düzgün takilmadigina karar vermektedir. Bulus konusu sistemde (1) yer alan kontrol ünitesi (8) sensör (6) ile iletisimde olmak, kurulan bu iletisim üzerinden aracin çalistirilmasi ile uzunluk ölçüm verilerini almak üzere yapilandirilmaktadir. Kontrol ünitesi (8) aracin çalistirilmasi ile toka (4) üzerindeki uyari elemanini (7) tetiklemek ve emniyet kemeri (2) düzgün bir sekilde takilincaya kadar uyari vermeye devam etmek üzere yapilandirilmaktadir. Kontrol ünitesi (8) sensörden (6) aldigi uzunluk ölçüm verisini analiz etmek, ölçüm verisi sifir ise emniyet kemerinin (2) hiç takilmadigina karar vermek ve uyari elemanini (7) ikaz vermesi için tetiklemek üzere yapilandirilmaktadir. Kontrol ünitesi (8) sensörden (6) aldigi uzunluk ölçüm verisini analiz etmek uzun ölçüm verisi sifir ile esik degeri arasinda ise emniyet kemerinin (2) düzgün takilmadigina karar vermek ve uyari elemanini (7) ikaz vermesi için tetiklemek üzere yapilandirilmaktadir. Bu sayede kontrol ünitesi (8) emniyet kemerinin (2) hiç takilmadigi ya da düzgün takilmadigi durumlari tespit ederek sürücüyü uyarmakta ve emniyet kemerini (2) takmaya ya da düzgün takmaya yönlendirmektedir. Bulus konusu sistem (1) sayesinde emniyet kemeri (2) kullanimi araçta kontrol edilmektedir. Emniyet kemerinin (2) sürücüyü ya da yolcuyu sarmadan kullanimlari ya da yalanci dil ile kullanimlari uzunluk ölçümünün yapilmasi ve önceden kayit altina alinan esik degeri ile karsilastirilmasi sayesinde kolay bir sekilde tespit edilmektedir. Diger taraftan toka (4) üzerinde yer alan uyari elemani (7) isik yayarak gece gibi karanlik sürüs baslangiçlarinda emniyet kemeri (2) takilincaya kadar kilavuz görevi görmekte ve sürücü tokayi (4) kolay bir sekilde seçebilmektedir. Bulusun tercih edilen çalisma seklinde kullanici araci çalistirdiginda emniyet kemeri tokasi (4) üzerinde LED olan uyari elamani (7) otomatik olarak yanmakta ve belirli bir süre emniyet kemerinin (2) takilmamasi durumunda sesli olarak uyari elemani (7) ile uyari verilmeye baslanmaktadir. Bulusta kullanici araci çalistirmadan ya da çalistirdiktan sonra sarim mekanizmasinda (5) bir hareket ya da referans degerin üzerinde bir hareket olmamasi durumunda uyari elemani (7) devreye girmekte hem sesli hem de toka (4) üzerinde görsel olarak uyari vermeye devam etmektedir. Kullanicinin emniyet kemerini (2) düzgün bir sekilde taktigi ve referans degerin asilmasi durumunda ise sesli ve görsel olarak verilen uyari sonlandirilmakta, toka (4) üzerindeki LED sönmekte ve sesli ikaz bitmektedir. Bu temel kavramlar etrafinda, bulus konusu "Bir Emniyet Kemeri Ikaz Sistemi" ile ilgili çok çesitli uygulamalarin gelistirilmesi mümkün olup, bulus burada açiklanan örneklerle sinirlandirilamaz, esas olarak istemlerde belirtildigi gibidir. TR TR TR TR TR TRDESCRIPTION A SEAT BELT WARNING SYSTEM Technical Field This invention relates to a warning system that checks whether a seat belt is fastened in a vehicle and provides an audible and visual warning if one is not fastened. Prior Art Seat belts are one of the elements used for safety purposes in vehicles. Seat belts are used to prevent injuries in collisions, which are the most common cause of fatal and serious injury accidents. Although seat belt use was made mandatory in 1992, checks are made to ensure that seat belts, which are life-saving features, are worn, sensors are used, and warnings are given when seat belts are not fastened. To fool seat belt warning systems, seat belts are worn behind or in front of the seat, or tongues that are not fastened to the seat belt buckle are inserted. This prevents warning systems from issuing warnings. Therefore, today, there is a need for solutions that use retractor mechanisms that activate when the seat belt is pulled, allowing the user to check whether the seat belt is fastened and to provide a warning if it is not. The document describes a system that provides a warning for fastening a seat belt. The system in question includes an optical sensor that detects whether a seat belt is attached to the seat bar. When the seat belt is attached to the seat bar, the light from the light-projecting part is blocked by the hook, detecting that the seat belt is attached to the seat bar. If the seat belt is not attached to the seat bar, the absence of the seat belt is detected, the light from the light-projecting part is not blocked, and the red patrol light and audible alarm are activated. The state-of-the-art Chinese patent document, numbered CN102555982B, describes a system that detects whether a passenger is not properly fastening their seat belt. In the system in question, a CCD camera captures an image of the passenger's seat belt fastening status. A processor processes the image and obtains the result through a pre-programmed algorithm. The system detects whether the passenger is not properly fastening their seat belt, whether they are not properly fastening their seat belt, and/or whether the passenger is sitting in a properly belted seat. A visual and audible alarm reminds the passenger to fasten their seat belt correctly. When the passenger fastens their seat belt correctly, the processor detects the coordinates of the seat belt, and the audible and audible alarm stops the alarm. Brief Description of the Invention The purpose of this invention is to realize a system that checks whether the seat belt is fastened in the vehicle by the measurement value taken from the seat belt rewinding mechanism and provides an audible and visual warning in case the seat belt is not fastened. Another purpose of the invention is to realize a system that detects when the seat belt is worn idle or not fastened at all by using a fake seat belt tongue and provides an audible and/or visual warning through the buckle. Another purpose of the invention is to realize a system that increases the visibility of the seat belt buckle in the vehicle and increases the effectiveness of the safety equipment. Detailed Description of the Invention "A Seat Belt Warning System" which was developed in order to achieve the purpose of this invention is shown in the attached figure, which shows; Figure 1. The subject of the invention is the appearance of a seat belt warning system. The parts in the figure are numbered one by one and the correspondences of these numbers are given below: 1. System Seat belt Rewinding mechanism Sensor Warning element Control unit The inventive warning system (1) which allows checking whether the seat belt in the vehicle is fastened and giving a warning in cases where the seat belt is not fastened, - at least one seat belt located on the vehicle and having a tongue (3) at its end, - at least one buckle (4) located on the vehicle and to which the seat belt is attached from the end with the tongue (3), - at least one rewinding mechanism (5) located on the vehicle and connected to the seat belt (2) from the other end without the tongue (3) and which allows the seat belt (2) to lengthen and shorten towards the buckle, - measuring the opening distance of the seat belt (2) which is opened to be fastened to the buckle from the rewinding mechanism (5), located on the rewinding mechanism (5). - at least one sensor (6) configured to warn in cases where the seat belt (2) is not fastened or not properly fastened, and - at least one warning element (7) located on the buckle (4) and configured to give a warning in cases where the seat belt (2) is not fastened or not properly fastened, and - to record the length of the seat belt (2) in case it is fastened loosely from the front surface or the back surface of the seat, to use the said value as a threshold value in the process of deciding whether the seat belt (2) is fastened or not, to decide whether the seat belt (2) is fastened when the threshold value is exceeded, to be triggered by the starting of the vehicle and to receive measurement data related to the seat belt (2) from the sensor (6) located on the rewinding mechanism (5), to decide whether the seat belt (2) is not fastened or not properly fastened in case the said measurement is between zero and the predetermined threshold value and to determine whether the seat belt (2) is not fastened or not properly fastened and - It comprises at least one control unit (8) configured to provide a warning by means of a warning element (7) located therein. The seat belt (2) in the system (1) in question is attached to the buckle (4) at one end and opens and closes at the rewinding mechanism (5) at the other end, and the opening length in this movement is measured by means of the sensor (6). The seat belt (2) is considered to be worn loose when it is worn loose by passing it over the front or back surface of the seat without wrapping around the driver or passenger. The length of the seat belt (2) when it is worn loose by passing it over the front or back surface of the seat without wrapping around the driver or passenger is considered as the reference value or threshold value. The threshold value is checked to check whether the seat belt (2) is worn loose. In the system (1) of the invention, the buckle (4) keeps the seat belt (2) tight by engaging the tongue (3). A warning element (7) in the form of a light source is located on the buckle (4) to provide a warning when the seat belt (2) is not fastened. The warning element (7) also provides an audible warning to warn the driver or passengers to fasten their seat belts. The warning element (7) is also configured to provide a warning in dark environments, such as at night, to help the driver or passenger find the buckle (4). The rewinding mechanism (5) in the system (1) of the invention controls the opening and closing movement of the seat belt (2) and obtains length measurement data when the belt is opened via the sensor (6) located on it. The sensor (6) located in the winding mechanism (5) is configured to share the length measurement data, when the seat belt (2) is fastened to the buckle (4), with the control unit (8) after the vehicle is started. This allows the comparison of the length measurements when the seat belt is fastened with a predetermined threshold value. The sensor (6) located in the system (1) of the invention is configured to communicate with the control unit (8) and, through this communication established, to share the measurement data it receives from the winding mechanism (5) with the control unit (8) when the vehicle is started. The control unit (8) compares the data it receives with the threshold value and decides whether the seat belt (2) is fastened or not properly fastened. The control unit (8) in the system (1) of the invention is configured to communicate with the sensor (6) and, through this established communication, to receive length measurement data upon starting the vehicle. The control unit (8) is configured to trigger the warning element (7) on the buckle (4) upon starting the vehicle and to continue to issue a warning until the seat belt (2) is properly fastened. The control unit (8) is configured to analyze the length measurement data received from the sensor (6), if the measurement data is zero, to decide that the seat belt (2) is not properly fastened, and to trigger the warning element (7) to issue a warning. The control unit (8) is configured to analyze the length measurement data received from the sensor (6), if the length measurement data is between zero and the threshold value, to decide that the seat belt (2) is not properly fastened, and to trigger the warning element (7) to issue a warning. In this way, the control unit (8) detects when the seat belt (2) is not fastened at all or not properly, warns the driver, and directs the driver to fasten the seat belt (2) or to fasten it properly. The inventive system (1) allows the use of seat belts (2) in the vehicle to be monitored. Using the seat belt (2) without wrapping it around the driver or passenger, or using it with a false tongue, is easily detected by measuring the length and comparing it with the previously recorded threshold value. Furthermore, the warning element (7) located on the buckle (4) emits light and serves as a guide until the seat belt (2) is fastened at the beginning of a dark drive, such as at night, allowing the driver to easily select the buckle (4). In the preferred operating mode of the invention, when the user starts the vehicle, the LED warning element (7) on the seat belt buckle (4) automatically lights up. If the seat belt (2) is not fastened for a certain period of time, the warning element (7) initiates an audible warning. In the invention, if there is no movement in the rewinding mechanism (5) or a movement above the reference value, either before or after the user starts the vehicle, the warning element (7) is activated and continues to give both an audible and a visual warning on the buckle (4). If the user fastens the seat belt (2) properly and the reference value is exceeded, the audible and visual warning is terminated, the LED on the buckle (4) turns off, and the audible warning ends. It is possible to develop a wide variety of applications related to the subject of the invention, "A Seat Belt Warning System", around these basic concepts, and the invention cannot be limited to the examples described here, but is essentially as stated in the claims.

Claims

REQUESTS

l. -At least one seat belt located on the vehicle and having a tongue (3) at its end, which ensures that the seat belt in the vehicle is checked and a warning is given in cases where the seat belt is not fastened, -At least one buckle (4) located on the vehicle and to which the seat belt is fastened from the end with the tongue (3), -At least one winding mechanism (5) located on the vehicle and connected to the seat belt (2) from the other end without the tongue (3) and which allows the seat belt (2) to extend and shorten towards the buckle, -At least one sensor (6) located on the winding mechanism (5) and configured to measure the opening distance of the seat belt (2) opened from the winding mechanism (5) to be fastened to the buckle, -At least one warning element (7) located on the buckle (4) and configured to give a warning in cases where the seat belt (2) is not fastened or not fastened properly, - A system characterized by at least one control unit (8) configured to record the length of the seat belt (2) when it is worn loosely from the front or back surface of the seat, to use the said value as a threshold value in the process of deciding whether the seat belt (2) is worn or not, to decide that the seat belt (2) is worn when the threshold value is exceeded, to be triggered by starting the vehicle and to receive measurement data related to the seat belt (2) from the sensor (6) located on the winding mechanism (5), to decide that the seat belt (2) is not worn at all or not properly if the said measurement is between zero and the predetermined threshold value, and to provide a warning by means of the warning element (7) located on the buckle (4).

2. A system (1) as in Claim 1, characterized by a seat belt (2) that is attached to the buckle (4) at one end and opens and closes in the winding mechanism (5) at the other end, and the opening length in the said movement is measured by means of a sensor (6).

3. A system (1) such as Claim 1 or Zadeki, characterized by the seat belt (2) being considered as idle when it is fastened to the buckle (4) by passing it over the front or back surface of the seat without enveloping the driver or passenger.

4. A system (1) as in any of the above claims, characterised by the seat belt (2) whose length is accepted as the reference value or threshold value when worn loosely, passing over the front or back surface of the seat without enveloping the driver or passenger.

5. A system (1) as in any of the above claims, characterised by a buckle (4) on which is placed a warning element (7) in the form of a light source to provide a warning in cases where the seat belt (2) is not fastened.

6. A system (1) as in any of the above claims, characterised by a warning element (7) configured to help the driver or passenger find the buckle (4) by giving a warning in dark environments such as at night.

7. A system (1) as in any of the above claims, characterized by a winding mechanism (5) that controls the opening and closing movement of the seat belt (2) and receives the length measurement data when it is opened by means of the sensor (6) located on it.

8. Any of the above claims, characterized by the sensor (6) configured to share with the control unit (8) the length measurement information when the seat belt (2) is fastened to the buckle (4) after the vehicle is started.

9. A system (1) as in any of the above claims, characterized by a sensor (6) configured to communicate with the control unit (8) and to share the measurement data received from the winding mechanism (5) with the control unit (8) by operating the vehicle through this communication.

10. A system as in any of the above claims, characterized by a control unit (8) configured to communicate with the sensor (6) and to receive length measurement data by operating the vehicle through this communication.

11. A system (1) as in any of the above claims, characterised by a control unit (8) configured to trigger the warning element (7) on the buckle (4) when the vehicle is started and to continue to give a warning until the seat belt (2) is properly fastened.

12. A system (1) as in any of the above claims, characterised by a control unit (8) configured to analyse the length measurement data received from the sensor (6), to decide that the seat belt (2) is not fastened at all if the measurement data is zero, and to trigger the warning element (7) to give a warning.

13. A system (1) as in any of the above claims, characterised by a control unit (8) configured to analyse the length measurement data received from the sensor (6), to decide that the seat belt (2) is not fastened properly if the length measurement data is between zero and the threshold value, and to trigger the warning element (7) to give a warning.