CN111409586B

CN111409586B - Automobile safety detection warning method

Info

Publication number: CN111409586B
Application number: CN202010369317.8A
Authority: CN
Inventors: 刘璐; 梁艳来; 张宇杭
Original assignee: Chongqing Technology and Business Institute Chongqing Radio and TV University
Current assignee: Chongqing Technology and Business Institute Chongqing Radio and TV University
Priority date: 2020-05-05
Filing date: 2020-05-05
Publication date: 2021-02-26
Anticipated expiration: 2040-05-05
Also published as: CN111409586A

Abstract

The invention discloses an automobile safety detection warning method, which comprises the following steps of firstly obtaining a warning system with a structure, wherein the warning system comprises a pressure sensor arranged on a seat and used for detecting the riding state of a driver and a passenger, a detection switch arranged in a lock catch of a safety belt and used for detecting the insertion state of a lock tongue, a warning device used for sending a warning prompt and a warning controller used for receiving a detection signal and sending warning information according to the detection signal, wherein the pressure sensor, the detection switch and the warning device are all electrically connected to the warning controller; still include the winder subassembly, the winder subassembly includes the casing and rotationally installs the pivot on the casing, and it has the meshbelt to coil in the pivot, has the radial distance sensor towards the pivot setting along the pivot on the casing, and distance sensor is located the position department of keeping away from the meshbelt pull-out on the casing, and distance sensor electricity is connected to warning controller. The invention has the advantages of accurate and reliable detection, good warning effect, contribution to improving the driving safety and the like.

Description

Automobile safety detection warning method

Technical Field

The invention relates to the technical field of automobile safety, in particular to an automobile safety detection warning method.

Background

With the development of society and the improvement of economic level, the keeping quantity of automobiles is also increased year by year. The automobile brings great convenience to the trip of people, but along with more and more automobiles on the road, traffic accidents happen occasionally, and safety belts are arranged on the automobile for guaranteeing the safety of drivers and passengers. According to statistics of the traffic department, the wearing of the safety belt is very important because the fastening of the safety belt can reduce the death rate of accidents by 85 percent.

In order to remind the driver to fasten the seat belt during driving, a detection switch is usually disposed at the lock catch of the seat belt assembly for detecting whether the locking pin of the seat belt is correctly inserted into the lock catch. However, some drivers still do not prefer to fasten a seat belt and they can easily fool the detection of the system by inserting the locking bolt into the buckle if it is inserted or inserted with the webbing against the seat, burying a significant safety hazard.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide an automobile safety detection warning method which is accurate and reliable in detection, good in warning effect and beneficial to improving driving safety.

In order to solve the technical problems, the invention adopts the following technical scheme:

a safety detection warning method for an automobile is characterized by comprising the following steps:

s1, firstly, acquiring a warning system with the following structure, wherein the warning system comprises a pressure sensor arranged on a seat and used for detecting the riding state of a driver and a passenger, a detection switch arranged in a lock catch of a safety belt and used for detecting the insertion state of a lock tongue, a warning device used for sending a warning prompt and a warning controller used for receiving a detection signal and sending warning information according to the detection signal, and the pressure sensor, the detection switch and the warning device are all electrically connected to the warning controller; the winding device comprises a winding device body and a winding device body, and is characterized by further comprising a winder assembly, wherein the winder assembly comprises a shell and a rotating shaft which is rotatably installed on the shell, a braid is wound on the rotating shaft, a distance sensor which is arranged along the radial direction of the rotating shaft and faces the rotating shaft is arranged on the shell, the distance sensor is located at a position, far away from the position where the braid is pulled out, on the shell, and the distance sensor is electrically connected to the warning controller;

s2, during detection, the warning controller receives a detection signal of the pressure sensor firstly, compares the detection signal with a preset pressure threshold value, and if the detection signal is smaller than the preset pressure threshold value, judges that no driver or passenger is seated on the seat, and ends the detection; otherwise, judging that the driver and the passenger are seated on the seat, and continuing the subsequent steps;

s3, the warning controller receives the detection signal of the detection switch, compares the detection signal with the preset switch state signal, judges that the bolt is not inserted into the lock catch if the detection signal and the preset switch state signal are not consistent, and sends warning information to the warning device; otherwise, judging that the bolt is correctly inserted into the lock catch, and continuing the subsequent steps;

s4, the warning controller receives the detection signal of the distance sensor, compares the detection signal with a preset distance threshold value, judges that the mesh belt is not fastened correctly if the detection signal is smaller than the preset distance threshold value, and sends warning information to the warning device; otherwise, judging that the mesh belt is fastened correctly, and finishing the detection.

Further, in step S1, two ends of the rotating shaft are respectively provided with a coaxially installed circular baffle, rotatable rollers are coaxially installed on the two circular baffles, and the rollers are provided with drawing openings through which the woven belts pass straight; a winding space is formed between the roller and the rotating shaft; the maximum winding length of the winding space is smaller than the total length of the woven belt, and the length difference of the winding space and the woven belt is larger than the maximum pulling-out length of the woven belt in a state of being directly fastened by attaching to a seat and smaller than the minimum pulling-out length of the woven belt in a state of bypassing a driver and passengers to be fastened correctly.

Further, in step S1, the inner diameter of the drum is the same as the diameter of the circular baffle, and the two ends of the drum near the ends are provided with annular retaining rings formed by inward protrusion, so that the outer sides of the annular retaining rings form flanges; the inner diameter of the annular retainer ring is smaller than the diameter of the circular baffle plates, and the two circular baffle plates are abutted against the annular retainer ring from outside to inside along the axial direction of the roller and are embedded into the flange.

Further, in step S1, the rotating shaft includes a winding portion located in the middle, a first shaft section and a second shaft section are sequentially disposed at both ends of the winding portion, and the diameter of the first shaft section is smaller than that of the winding portion and larger than that of the second shaft section; the length of the first shaft section is smaller than the thickness of the circular baffle plate, and the middle part of the circular baffle plate is provided with a through hole matched with the first shaft section; the second shaft section is provided with threads, and the circular baffle is coaxially sleeved on the first shaft section and fixed on the rotating shaft through a bolt arranged on the second shaft section.

Further, in step S1, the first shaft section has a regular quadrilateral or regular hexagon shape in a cross section perpendicular to the axial direction, and the through hole in the middle of the circular baffle has a matching regular quadrilateral or regular hexagon shape.

Further, in the step S1, the drawing opening is provided with a long strip shape along the axial direction of the drum, the width of the drawing opening is consistent with the thickness of the mesh belt, the middle portion of the mesh belt is provided with a protruding portion with an increased thickness, the thickness of the protruding portion is greater than the width of the drawing opening, the length of the mesh belt from the protruding portion to the rotating shaft is the maximum winding length of the winding space, and when the mesh belt with the length is completely wound on the rotating shaft, a gap is formed between the mesh belt and the inner wall of the drum.

Further, in the step S1, the protruding portion is rubber glued to the surface of the webbing.

In conclusion, the invention has the advantages of accurate and reliable detection, good warning effect, contribution to improving the driving safety and the like.

Drawings

Fig. 1 is a schematic view of an installation structure of a seat belt for a vehicle.

Fig. 2 is a schematic diagram of a safety warning system.

Fig. 3 is a schematic sectional view of a winder assembly part.

Fig. 4 is an exploded view of the shaft and drum.

Fig. 5 is a schematic structural view of the retractor assembly of embodiment 1.

Fig. 6 is a schematic structural view of another possible retractor assembly according to embodiment 1.

Fig. 7 is a schematic structural view of a retractor assembly of embodiment 2.

Detailed Description

The present invention will be described in further detail below with reference to an embodiment of an automotive safety warning system.

Embodiment 1, as shown in fig. 1 and 2, a safety warning system for a vehicle includes a seat and a seatbelt assembly configured to fit the seat, and a conventional seatbelt buckle detection system. The safety belt assembly comprises a retractor component 1, a mesh belt 2, a lock tongue 3, a guider 8 and a lock catch 9, wherein the retractor component 1 and the guider 8 are installed on a vehicle body on one side of a seat, the lock catch 9 is installed on the vehicle body on the other side of the seat, and the retractor component 1 is positioned below the guider 8; the mesh belt 2 is pulled out upwards from the winder component 1, penetrates through the guider 8, penetrates through the lock tongue 3 and then extends downwards to be fixed on the vehicle body. The tongue 3 is slidably mounted on the webbing 2 and releasably insertable into the buckle 9.

The existing safety belt fastening detection system comprises a pressure sensor arranged below a seat and used for detecting whether a driver or a passenger sits on the seat; the detection switch is arranged in the lock catch 9 and used for detecting whether the bolt 3 is correctly inserted into the bolt 9; the warning device is integrated in the automobile instrument system and used for sending out warning prompts; and the warning controller is integrated in the vehicle control unit and used for receiving the detection signal and sending warning information according to the detection signal.

Specifically, the warning controller receives a detection signal of the pressure sensor, compares the detection signal with a preset pressure threshold value, and judges that a driver or passenger does not take the seat if the detection signal is smaller than the preset pressure threshold value, and the detection is finished; otherwise, judging that a driver and passengers sit on the seat, continuously receiving the detection signal of the detection switch, comparing the detection signal with the preset switch state signal, judging that the lock tongue is not inserted into the lock catch if the detection signal is inconsistent with the preset switch state signal, and sending warning information to the warning device. Otherwise, the bolt is judged to be correctly inserted into the lock catch.

In order to avoid the situation that the driver and passengers use other lock tongues or directly insert the lock tongues into the lock catches under the state that the mesh belt is attached to the seat, the deception detection system has the following characteristics:

as shown in fig. 3, the retractor assembly 1 includes a housing 11 and a rotating shaft 12 rotatably mounted on the housing 11, one end of the webbing 2 is wound on the rotating shaft 12, the housing 11 has a distance sensor 4 disposed on the housing 11 along a radial direction of the rotating shaft 12 toward the rotating shaft 12, the distance sensor 4 is located on the housing 11 at a position far from the position where the webbing 2 is pulled out, and the distance sensor 4 is electrically connected to the warning controller. In this embodiment, the distance sensor 4 is an infrared distance sensor.

Because the woven belt is wound on the rotating shaft, the longer the woven belt is drawn out, the smaller the thickness of the woven belt wound on the rotating shaft is, and the larger the value detected by the distance sensor is. Thus, the length of the pulled webbing can be obtained according to the thickness of the webbing and the distance detected by the distance sensor. Therefore, the distance value detected by the distance sensor and the pulled-out length of the woven belt can form a corresponding relation, and the pulled-out length of the woven belt when the woven belt is correctly fastened can be judged as long as the distance value detected by the distance sensor is larger than the preset distance value.

Specifically, after the warning controller determines that the lock tongue is correctly inserted into the buckle, the warning controller further needs to acquire a detection signal of the distance sensor, compare the detection signal with a preset distance value, determine that the safety belt is not correctly fastened if the detection signal is smaller than the preset distance value, and send warning information to the warning device. Otherwise, judging that the safety belt is fastened correctly, and finishing the detection.

During specific operation, the winding thickness of the mesh belt is influenced by the winding number of turns of the mesh belt, and the winding force is also influenced, namely the mesh belt with the same length has smaller winding thickness when the winding force is larger, and on the contrary, the winding thickness is larger when the winding force is smaller, so that the correct detection of the distance sensor can be influenced.

For this purpose, in the present embodiment, two ends of the rotating shaft 12 are respectively provided with a circular baffle 13 coaxially installed, a rotatable roller 14 is coaxially installed on the two circular baffles 13, and a drawing opening 15 for the flat passing of the webbing 2 is formed on the roller 14; a winding space 16 is formed between the roller 14 and the rotating shaft 12; the maximum winding length of the winding space 16 is smaller than the total length of the webbing 2, and the difference between the lengths is larger than the maximum pull-out length of the webbing 2 in a state of being directly fastened against a seat and smaller than the minimum pull-out length of the webbing 2 in a state of being correctly fastened by bypassing a driver and a passenger.

Because the difference between the maximum winding length of the winding space and the total length of the woven belts is smaller than the minimum pulling-out length of the woven belts in a correct fastening state, when the woven belts are not fastened correctly, the woven belts are bound on the roller certainly, and when the woven belts are fastened correctly, the woven belts are not bound on the roller certainly, the roller and the rotating shaft are arranged coaxially, and the distance between the surface of the roller and the distance sensor is a fixed value. Therefore, as long as the pulled-out length of the mesh belt meets the pulling-out length requirement under the correct fastening state, the mesh belt is not wound on the roller, the distance sensor can directly detect the distance of the roller and is not influenced by the winding force of the mesh belt, and the detection accuracy is improved. In the running process of the vehicle, whether the safety belt is in a correct fastening state can be judged only by detecting whether the distance between the distance sensor and the roller direction is the value.

In this embodiment, the inner diameter of the drum 14 is the same as the diameter of the circular baffle 13, and the positions of the two ends of the drum 14 near the end parts are provided with annular retaining rings 17 formed by inward protrusion, so that the outer sides of the annular retaining rings 17 form flanges; the inner diameter of the annular retainer ring 17 is smaller than the diameter of the circular baffle plates 13, and the two circular baffle plates 13 are abutted against the annular retainer ring 17 from outside to inside along the axial direction of the roller 14 and embedded into the flange.

Like this, paste through the annular retaining ring of fixing in epaxial circular baffle and the cylinder and lean on, carry on spacingly to the cylinder in the axial, avoid cylinder axial float, and because the internal diameter of cylinder is unanimous with circular baffle's diameter for circular baffle makes cylinder and circular baffle be in coaxial state all the time under the effect of the outer flange of annular retaining ring. The structure is simple in matching, fault rate is reduced, and reliability is improved.

In implementation, as shown in fig. 4, the rotating shaft 12 includes a winding portion 12a located in the middle, a first shaft section 12b and a second shaft section 12c are sequentially disposed at both ends of the winding portion 12a, and the diameter of the first shaft section 12b is smaller than that of the winding portion 12a and is larger than that of the second shaft section 12 c; the length of the first shaft section 12b is smaller than the thickness of the circular baffle 13, and the middle part of the circular baffle 13 is provided with a through hole matched with the first shaft section 12 b; the second shaft section 12c is provided with threads, and the circular baffle 13 is coaxially sleeved on the first shaft section 12b and fixed on the rotating shaft 12 through a bolt arranged on the second shaft section 12 c.

Because the length of the first shaft section is smaller than the thickness of the circular baffle plate, the circular baffle plate which is coaxially sleeved on the first shaft section is extruded on the step surface on the other side of the first shaft section under the action of the bolt on the second shaft section, and therefore the circular baffle plate can be fixed on the rotating shaft. In addition, the two circular baffles keep a fixed distance under the limitation of the winding part, so that the circular baffles can be prevented from being extruded on the annular baffle ring of the roller, and the roller can be ensured to smoothly rotate around the circular baffles.

In addition, in the present embodiment, the shape of the first shaft section 12b in the cross section perpendicular to the axial direction is a regular hexagon, and the through hole in the middle of the circular baffle 13 is a matching regular hexagon.

Like this, through regular hexagon's hole axle cooperation, can avoid the cylinder to drive the relative pivot of circular flange and rotate around circular baffle pivoted in-process, and then influence the bolt to improve overall structure's reliability.

In implementation, the drawing opening 15 is arranged in a long strip shape along the axial direction of the drum 14, the width of the drawing opening 15 is consistent with the thickness of the woven tape 2, the middle part of the woven tape 2 is provided with a protruding part 21 with increased thickness, the thickness of the protruding part 21 is greater than the width of the drawing opening 15, the length of the woven tape between the protruding part 21 and the rotating shaft 12 is the maximum winding length of the winding space 16, and when the woven tape with the length is completely wound on the rotating shaft 12, a gap is formed between the woven tape 2 and the inner wall of the drum 14. In particular, one end of the drawing opening 15 extends in a length direction and penetrates the drum 14, so that the installation and assembly of the webbing can be facilitated.

Therefore, the braid positioned at the outer end of the protruding part can not enter the winding space through the protruding part with the thickness larger than the width of the pull opening, so that the braid can be prevented from entering the winding space without limit and filling the winding space, and the braid is extruded in the winding space to influence the normal pull-out use of the braid.

As shown in fig. 5, in this embodiment, the middle portion of the webbing 2 has a plurality of prefabricated holes equidistantly arranged along the length direction, and the protruding portion 21 is a snap fastener detachably fastened on one of the prefabricated holes. In particular implementation, the protrusion 21 may also be rubber glued to the surface of the webbing 2.

Like this, because the seat height and the position of different motorcycle types are different, and meshbelt 2 is along the direct pull-out length also nearly not the same under the buckle state of pulling out of seat, through detachable snap fastener, can adjust according to seat height and position. The specific adjustment method is as follows:

the lock bolt 3 is directly inserted into the lock fastener, so that the woven belt is stretched straight along the seat, then the seat is adjusted front and back and up and down, the maximum pulling-out position of the woven belt is found, then the woven belt is pulled out for 1-2 circles, and the snap fastener is buckled on the prefabricated hole close to the outlet of the shell 11, so that the adjustment can be completed.

In order to better judge that the webbing wound around the drum is completely pulled out, in the present embodiment, the drum 14 has a yielding hole 18 penetrating in the radial direction, and when the webbing of the winding space is in a pulled-out state, the distance sensor 4 is directly facing the yielding hole in the radial direction.

Once a driver and passengers correctly fasten the safety belt, the woven belt in the winding space is pulled out without the woven belt wound on the drum, the distance sensor directly detects the distance of the woven belt wound on the rotating shaft through the abdicating hole, and the distance is certainly greater than the distance from the distance sensor to the surface of the drum, so that the fastening state of the safety belt can be judged more reliably through comparing the actually detected distance with the distance from the distance sensor to the surface of the drum.

In order to avoid the distance sensor from being damaged and unable to detect correctly, in this embodiment, a redundancy detection scheme is further designed, specifically: the detection feature object 5 used for being detected is fixedly attached to the mesh belt 2, the detection feature object 5 is located in the middle of the mesh belt 2, and the length from the detection feature object 5 to the outer end of the mesh belt 2 is larger than the maximum pull-out length of the mesh belt 2 in a state of being directly fastened by attaching to a seat and smaller than the minimum pull-out length of the mesh belt 2 in a state of being correctly fastened by bypassing a driver and passengers; and a switch sensing device 7 for detecting the passing of the detection feature 5 is further arranged at the outlet of the shell 11, and the switch sensing device 7 is electrically connected to the warning controller.

Because the length from the detection feature to the outer end of the mesh belt is greater than the maximum pull-out length of the mesh belt in the state of direct fastening of the mesh belt, once a driver and passengers do not fasten the seat belt correctly, the detection feature fixedly attached to the mesh belt cannot be pulled out from the outlet of the shell. And the length from the detection characteristic object to the outer end of the woven belt is smaller than the minimum pull-out length under the correct fastening state, so that once a driver fastens the safety belt correctly, the detection characteristic object is pulled out from the shell together with the woven belt, and the detection characteristic object can be detected by a switch sensing device arranged at the outlet of the shell. By arranging the detection feature on the woven belt and controlling the distance between the detection feature and the outer end of the woven belt, whether the pull-out length of the woven belt is in a correct fastening state or not can be known through the switch sensing device.

Specifically, after the warning controller determines that the lock tongue is correctly inserted into the buckle, the detection signal of the switch sensing device 7 can be further acquired and compared with a preset switch signal value, if the detection signal and the preset switch signal value are different, it can be determined that the safety belt is not correctly fastened, and warning information is sent to the warning device. Otherwise, judging that the safety belt is fastened correctly, and finishing the detection.

In this embodiment, the detection feature 5 is a protrusion protruding in the thickness direction of the webbing 2, specifically, the protrusion is a snap fastener detachably fastened to one of the prefabricated holes, and the switch sensing device 7 is a micro switch with a self-locking function disposed at the outlet of the housing 11 and corresponding to the position of the snap fastener on the webbing passing through the outlet.

Due to the adoption of the self-locking microswitch, the protrusion part triggers the microswitch when the shell is pulled out, the self-locking microswitch can reserve the triggering state, and when the woven belt is retracted, the protrusion part triggers the microswitch through the outlet again, and the self-locking microswitch switches and reserves the switching state.

In this embodiment, the outlet of the housing 11 has a concave notch corresponding to the position of the protruding portion passing through with the webbing, the microswitch is installed in the notch, and the pressing portion of the microswitch is flush with the outlet.

Therefore, the phenomenon that the microswitch is pressed due to deformation in the process of pulling out the safety belt to cause mistaken touch of the microswitch can be avoided, and the detection accuracy is improved.

In a specific implementation, as shown in fig. 6, the protruding portion may also extend along the middle portion of the webbing 2 toward the inner end thereof; the switch sensing device 7 is a micro switch arranged at the outlet of the shell 11 and corresponds to the position of the protruding part on the woven belt passing through the outlet. Thus, the microswitch is not triggered when the webbing with the protrusion is not pulled out, and the protrusion triggers the microswitch when the webbing with the protrusion is pulled out from the housing outlet, so that whether the seatbelt is fastened correctly or not can be determined.

Example 2:

the main difference from the embodiment 1 is that, as shown in fig. 7, the detection feature 5 is a metal strip attached to the webbing 2, and the metal strip is extended from the middle of the webbing 2 toward the inner end thereof; the switch sensing device 7 is a proximity switch arranged at the outlet of the housing 11 and corresponds to the position of the metal strip on the woven tape passing through the outlet.

Since the metal strap is extended along the webbing toward its inner end, once the occupant has properly fastened the belt, the webbing with the metal strap attached thereto must pass through the exit, and the metal strap must be present on the webbing at the exit, and thus can be detected by the proximity switch. When the safety belt is not fastened or is directly fastened from the back of a driver or a passenger, the woven belt with the metal belt is still in the shell, so that the woven belt at the outlet of the shell is free of the metal belt, the proximity switch cannot detect the existence of the metal belt, and the safety belt can be judged to be not fastened correctly.

In addition, the outlet of the housing 11 is also provided with a plastic housing 6 in a connecting manner, the plastic housing 6 is provided with a pull-out channel for pulling out the braid, and the proximity switch is embedded in the plastic housing 6.

Like this, inlay the proximity switch and establish on the plastic casing that sets up alone, because plastics can't be by proximity switch's detection, just can avoid proximity switch to receive the interference of other metal object on the casing, be favorable to improving the accuracy of testing result.

Meanwhile, the metal belt is formed by interweaving metal wires and the woven belt 2.

Therefore, the strength of the strap attached to the webbing can be increased without affecting the overall strength of the webbing, and the service life of the webbing can be prolonged.

In practice, the proximity switch is a square inductive proximity switch.

The square inductive proximity switch is small in size, convenient to install and fix on the shell or the plastic shell, and meanwhile, the inductive proximity switch can accurately detect a metal belt.

The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety detection warning method for an automobile is characterized by comprising the following steps:

s1, firstly, acquiring a warning system with the following structure, wherein the warning system comprises a pressure sensor arranged on a seat and used for detecting the riding state of a driver and a passenger, a detection switch arranged in a lock catch of a safety belt and used for detecting the insertion state of a lock tongue, a warning device used for sending a warning prompt and a warning controller used for receiving a detection signal and sending warning information according to the detection signal, and the pressure sensor, the detection switch and the warning device are all electrically connected to the warning controller; the winding device is characterized by further comprising a winding component (1), wherein the winding component (1) comprises a shell (11) and a rotating shaft (12) which is rotatably installed on the shell (11), a braid (2) is wound on the rotating shaft (12), a distance sensor (4) which is arranged along the radial direction of the rotating shaft (12) and faces the rotating shaft (12) is arranged on the shell (11), the distance sensor (4) is located on the shell (11) and is far away from the position where the braid (2) is pulled out, and the distance sensor (4) is electrically connected to the warning controller;

s4, the warning controller receives the detection signal of the distance sensor, compares the detection signal with a preset distance threshold value, judges that the mesh belt is not fastened correctly if the detection signal is smaller than the preset distance threshold value, and sends warning information to the warning device; otherwise, judging that the mesh belt is fastened correctly, and finishing the detection;

in the step S1, two ends of the rotating shaft (12) are respectively provided with a circular baffle (13) coaxially mounted, rotatable rollers (14) are coaxially mounted on the two circular baffles (13), and the rollers (14) are provided with drawing openings (15) through which the woven belt (2) passes straightly; a winding space (16) is formed between the roller (14) and the rotating shaft (12); the maximum winding length of the winding space (16) is less than the total length of the mesh belt (2), and the length difference of the two is greater than the maximum pull-out length of the mesh belt (2) in a state of being directly fastened by attaching to a seat and less than the minimum pull-out length of the mesh belt (2) in a state of being fastened by bypassing a driver and passengers correctly.

2. The automobile safety detection warning method according to claim 1, characterized in that in step S1, the inner diameter of the drum (14) is consistent with the diameter of the circular baffle (13), and the positions of two ends of the drum (14) near the end parts are provided with annular retaining rings (17) which are formed by protruding inwards, so that the outer sides of the annular retaining rings (17) form flanges; the inner diameter of the annular retainer ring (17) is smaller than the diameter of the circular baffle plates (13), and the two circular baffle plates (13) are abutted against the annular retainer ring (17) from outside to inside along the axial direction of the roller (14) and are embedded into the flange.

3. The automobile safety detection warning method according to claim 2, wherein in the step S1, the rotating shaft (12) includes a winding portion (12 a) located in the middle, a first shaft section (12 b) and a second shaft section (12 c) are sequentially disposed at both ends of the winding portion (12 a), and the diameter of the first shaft section (12 b) is smaller than that of the winding portion (12 a) and larger than that of the second shaft section (12 c); the length of the first shaft section (12 b) is smaller than the thickness of the circular baffle (13), and the middle part of the circular baffle (13) is provided with a through hole matched with the first shaft section (12 b); the second shaft section (12 c) is provided with threads, and the circular baffle (13) is coaxially sleeved on the first shaft section (12 b) and fixed on the rotating shaft (12) through a bolt arranged on the second shaft section (12 c).

4. The automobile safety detection warning method according to claim 3, wherein in the step S1, the shape of the first shaft section (12 b) on the cross section perpendicular to the axial direction is a regular quadrangle or a regular hexagon, and the through hole in the middle of the circular baffle (13) is a matched regular quadrangle or a matched regular hexagon.

5. The vehicle safety detecting and warning method according to claim 1, wherein in the step S1, the draw-out opening (15) is arranged in a long strip shape along the axial direction of the drum (14), the width of the draw-out opening (15) is consistent with the thickness of the webbing (2), the middle of the webbing (2) is provided with a protruding portion (21) with the increased thickness, the thickness of the protruding portion (21) is greater than the width of the draw-out opening (15), the length of the webbing from the protruding portion (21) to the rotating shaft (12) is the maximum winding length of the winding space (16), and when the webbing of the length is completely wound on the rotating shaft (12), a gap is formed between the webbing (2) and the inner wall of the drum (14).

6. The vehicle safety detection warning method according to claim 5, wherein in the step S1, the protruding portion (21) is rubber glued to the surface of the webbing (2).