CN217804416U - Novel automobile seat sensor, alarm system and safety belt alarm system - Google Patents

Abstract

The utility model discloses a novel car seat sensor, alarm system and safety belt alarm system relates to sensor technical field. The seat sensor is composed of an upper shell, an elastic component, a conductive module and a switch circuit. The elastic component is connected with at least the upper shell; the elastic force is provided to restore the upper shell to the original position; the conductive module is arranged in the elastic component; the switching circuit has contacts; in a natural state, the contact is not in contact with the conductive module, and the switching circuit is in an off state; the contact can contact with the conductive module in the process of compressing the elastic component, and when the contact is in contact with the conductive module, the switch circuit is in a closed state. The utility model provides high seat sensor's life and reliability.

Description

Novel automobile seat sensor, alarm system and safety belt alarm system

Technical Field

The utility model relates to a sensor technical field especially relates to a novel car seat sensor, alarm system and safety belt alarm system.

Background

Along with the increasing improvement of the living standard of people and the increase of the automobile keeping quantity, people pay more and more attention to the safety of automobile driving. Among them, the seat sensor has an important safety function in the driving process.

Seat sensors are generally used simultaneously with a seat belt switch to ensure safety: when a passenger sits on the seat, if the passenger fastens the safety belt, the safety belt switch in the normally closed state is in an off state, meanwhile, the seat sensor starts to work under the action of the gravity of the passenger, the switch in the seat sensor is closed, and the alarm system does not work under the condition; if the passenger does not fasten the seat belt while sitting on the seat, the seat belt switch is in a normally closed state, and the seat sensor switch is closed. Because safety belt switch, seat sensor and controller are established ties mutually, under this condition, seat sensor will export the signal of telecommunication, and the controller sends the chimes of doom according to signal of telecommunication control alarm lamp scintillation and control loudspeaker to remind the passenger to fasten the safety belt. When the passenger is not seated, the seat sensor does not operate.

A traditional seat sensor usually adopts a membrane switch structure, and the structure has the defects of short service life, easiness in damage and the like. Therefore, a new type of car seat sensor is needed.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a novel car seat sensor, alarm system and safety belt alarm system to improve seat sensor's life and reliability.

In order to achieve the above object, the embodiment of the present invention provides the following solutions:

a novel car seat sensor, said novel car seat sensor comprising:

an upper housing;

a plurality of elastic members; the elastic component is at least connected with the upper shell; the elastic force is provided to restore the upper shell to the original position;

a conductive module disposed within the elastic member;

a switching circuit having contacts;

in a natural state, the contact is not in contact with the conductive module, and the switching circuit is in an off state; the contact can contact with the conductive module in the process of compressing the elastic component, and when the contact is in contact with the conductive module, the switch circuit is in a closed state.

Optionally, the elastic member is made of Mn65 type steel, and the surface of the elastic member is subjected to bluing heat treatment.

Optionally, the resilient member has a diameter in the range of 0.8mm to 1.5mm.

Optionally, the conductive module comprises a housing and a graphite conductive block;

the graphite conductive block can move along with the shell when the shell deforms so as to realize the contact and separation of the graphite conductive block and the contact; wherein the housing is deformed during compression of the elastic member.

Optionally, the switching circuit is disposed on a printed circuit board; the printed circuit board is also provided with a pin connector;

the pin connector is connected with the switch circuit and used for outputting an electric signal;

the printed circuit board is connected with the elastic part and the conductive module respectively to support the elastic part and the conductive module.

Optionally, the novel car seat sensor further comprises:

a lower case for accommodating the printed circuit board;

and the fixing piece is used for fixing the lower shell on the automobile seat.

In order to achieve the above object, the embodiment of the present invention further provides the following scheme:

an alarm system, the alarm system comprising: the novel automobile seat sensor comprises a controller and a novel automobile seat sensor, wherein the controller is electrically connected with the novel automobile seat sensor;

the controller is configured to: and sending out an alarm signal according to the electric signal sent by the novel automobile seat sensor.

A seat belt warning system, the seat belt warning system comprising:

a safety belt switch, a controller and a novel automobile seat sensor;

the safety belt switch, the controller and the novel automobile seat sensor are connected in series;

wherein, when the safety belt is not fastened, the safety belt switch is in a closed state;

the controller is configured to: when the safety belt switch is in a closed state and receives an electric signal sent by the novel automobile seat sensor, an alarm signal is sent.

According to the utility model provides a specific embodiment discloses following technological effect:

an embodiment of the utility model provides a novel car seat sensor, alarm system and safety belt alarm system, the seat sensor comprises last casing, elastomeric element, electrically conductive module, switch circuit. When a passenger sits on the seat, the upper shell moves downwards under the action of the gravity of the passenger and compresses the elastic component; during the process that the elastic component is compressed, the distance between the conductive module and the contact in the switch circuit is reduced, and the conductive module and the contact can be contacted. When the conductive module is contacted with the contact on the switch circuit, the switch circuit is in a closed state, and the seat sensor starts to work; if the passenger leaves the seat, the upper shell is restored to the original position under the action of the elastic component, in the process, the conductive module is disconnected from the switch circuit, the switch circuit is in a disconnected state, and the seat sensor stops working; therefore, the automobile seat sensor can realize that when a passenger sits on the seat, the switch circuit is in a closed state, and when the passenger leaves the seat, the switch circuit is disconnected.

Meanwhile, the service life (use times) of the elastic component is longer than that of the membrane switch, for example, the use times of some elastic components can reach one million times, and the design of multiple elastic components improves the reliability, even if one elastic component fails, other elastic components can still work. Therefore, compare with current membrane switch structure, the embodiment of the utility model provides a seat sensor's life is longer, and the reliability is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a novel car seat sensor provided in an embodiment of the present invention;

fig. 2 is a cross-sectional view of a novel car seat sensor provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a novel upper shell of an automobile seat sensor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a novel conductive module of a vehicle seat sensor according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a deformation of a novel conductive module of a vehicle seat sensor according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a novel conductive module of an automobile seat sensor according to an embodiment of the present invention recovering to its original state;

fig. 7 is a schematic diagram of a switch circuit of a novel car seat sensor provided in an embodiment of the present invention;

fig. 8 is a schematic view of a novel contact structure of a car seat sensor according to an embodiment of the present invention;

fig. 9 is an electrical schematic diagram of a novel automobile seat sensor pin connector according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of an alarm system according to an embodiment of the present invention.

Description of the symbols:

the novel automobile seat sensor comprises an upper shell body-1, silencing cotton-11, a spring-21, a conductive module-3, a shell-31, a graphite conductive block-32, a printed circuit board-41, a pin connector-42, a contact-43, a trigger area-44, a lower shell body-5, a fixing piece-6, a controller-7, a novel automobile seat sensor-8 and a safety belt switch-9.

Detailed Description

The structure and the scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and it is known by a person of ordinary skill in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems with the occurrence of a new scenario.

It is noted that, in the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or illustrations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The embodiment of the utility model provides a purpose provides a novel car seat sensor, alarm system and safety belt alarm system to solve traditional membrane switch structure life weak point, damage the scheduling problem easily, prolonged seat sensor's life, improved seat sensor's reliability.

Fig. 1 to 2 show an exemplary structure of the above vehicle seat sensor (fig. 1 is an exploded view, and fig. 2 is a sectional view), and includes an upper case 1, a conductive module 3, a switching circuit, and a plurality of elastic members.

The elastic component is connected with at least the upper shell 1 and is used for providing elastic force to restore the upper shell 1 to the original position; the number of elastic components, for example, 2, 3, 4, etc., can be flexibly designed by those skilled in the art, and will not be described herein.

In one example, the elastic member may be embodied as a spring 21; as long as it can provide elastic force to restore the upper case 1 to the original position. The conductive module 3 is arranged in the elastic component; specifically, taking the spring 21 as an example, at least one conductive module 3 may be disposed in each spring 21.

Of course, in other examples of the embodiment of the present invention, the elastic component may also be other elastic components (e.g. hollow silicone component) different from the spring, as long as it can provide the elastic force for the upper casing 1 and can accommodate the conductive module 3, and in the process of deformation, the conductive module 3 can be contacted and separated from the contact 43.

Referring to fig. 7, the switching circuit has contacts 43; in a natural state, the contact 43 is not in contact with the conductive module 3, and the switching circuit is in an off state; the contact 43 can be brought into contact with the conductive module 3 during the compression of the elastic member, and the switch circuit is in a closed state when the contact 43 is brought into contact with the conductive module 3.

Still taking the car seat sensor shown in fig. 2 as an example, the mutual cooperation among the components is as follows: when a passenger sits on the seat, the upper case 1 moves downward by the weight of the passenger while compressing the elastic member; during the compression of the elastic member, the distance between the conductive module 3 and the contact 43 in the switch circuit is reduced, and the two can be in contact. When the conductive module 3 is in contact with the contact 43 on the switching circuit, the switching circuit is in a closed state. If the passenger leaves the seat, the upper shell 1 is restored to the original position under the action of the elastic component, in the process, the conductive module 3 is disconnected from the switch circuit, and the switch circuit is in an off state.

Therefore, the automobile seat sensor can realize that when a passenger sits on the seat, the switch circuit is in a closed state, the passenger leaves the seat, and the switch circuit is disconnected, so that the reliability of the automobile seat sensor is improved to a certain extent.

Meanwhile, the service life (use times) of the spring 21 is longer than that of a membrane switch, for example, the use times of some springs 21 can reach one million times, and the design of multiple elastic parts improves the reliability, even if one spring fails to work 21, other springs 21 can still work. Therefore, compare with current membrane switch structure, the embodiment of the utility model provides a seat sensor 8's life is longer, and the reliability is higher.

It should be noted that, in addition to providing the elastic force to the upper housing 1, the elastic member may also protect other modules disposed inside thereof: under the action of the gravity of passengers, the spring 21 can play a role in buffering, the pressure intensity borne by the conductive module 3 in the spring 21 is reduced, so that the conductive module 3 can be protected, and the service life of the whole automobile seat sensor 8 is prolonged to a certain extent.

In other embodiments of the present invention, please refer to fig. 3, the upper housing 1 is made of reinforced nylon plastic, which has good strength and anti-aging performance and can bear large pressure.

Further, a silencing cotton 11 may be disposed at an edge of the upper casing 1 to reduce vibration and noise generated during the downward movement of the upper casing 1.

The sound-deadening cotton 11 may be made of a material having good toughness and a shock-absorbing effect, such as EPDM (ethylene propylene diene monomer).

The spring is described below.

Illustratively, the spring 21 is made of a Mn65 type steel material, and the surface of the spring 21 is subjected to a bluing heat treatment.

The bluing heat treatment may be performed in various manners, for example, the spring 21 may be heated in hot air or superheated steam at a high temperature of 540 to 560 ℃ for an exemplary heating time of 60 to 90 minutes; as another example, the spring 21 is heated in concentrated caustic soda with sodium nitrite added, at a temperature that may range illustratively from 140 deg.C to 150 deg.C, for a heating time that may illustratively range from 30 to 60 minutes, for a sodium nitrite solution concentration that may illustratively range from 150 to 250 grams per liter, and for a caustic soda solution concentration that may illustratively range from 550 to 700 grams per liter.

After the spring 21 is subjected to bluing heat treatment, a layer of blue or black oxide film is formed on the surface of the spring, and the thickness of the oxide film is 0.5-1.5 microns. The outer layer of the oxidation film is mainly ferroferric oxide, and the inner layer is ferrous oxide. With the oxide film, the durability, high and low temperature performance and corrosion resistance of the spring 21 are better.

In other examples, the diameter of the spring 21 in all of the above embodiments may range from 0.8mm to 1.5mm.

The conductive module will be described in detail below. Fig. 4 shows an exemplary structure of the conductive module, which includes a housing 31 and a graphite conductive block 32.

The graphite conductive block 32 can move along with the shell 31 when the shell 31 is deformed so as to realize the contact and separation of the graphite conductive block 32 and the contact 43; wherein the shell 31 is deformed during the compression of the elastic member.

In one example, a space for accommodating the graphite conductive block 32 may be provided on the housing 31, and the graphite conductive block 32 is partially exposed with the exposed portion facing the contact 43.

In another example, the graphite conductive block 32 may be directly adhered to the housing 31 with the graphite conductive block 32 facing the contact 43.

Taking the elastic component as the spring 21 as an example, the working process between the components is as follows in conjunction with the foregoing description:

referring to fig. 5, when a passenger sits on the seat, the upper case 1 moves downward by the weight of the passenger while compressing the spring 21; in the process of compressing and contracting the spring 21, the upper shell 1 contacts the shell 31 to deform the shell 31, the top of the shell 31 (the part contacting with the upper shell 1 is the top) moves downwards, the graphite conductive block 32 in the shell 31 moves downwards, the distance between the graphite conductive block 32 and the contact 43 is reduced, and when the graphite conductive block 32 contacts with the contact 43, the switch circuit is in a closed state.

When the passenger leaves the seat, in the process that the upper shell 1 returns to the original position under the action of the spring 21, the acting force of the upper shell 1 on the shell 31 is also continuously reduced, the top of the shell 31 moves upwards to drive the graphite conductive block 32 to be separated from the contact 43, and the switching circuit is in a disconnected state.

Fig. 6 is a schematic diagram illustrating the conductive module being restored.

In order to realize the deformation, the housing 31 may be made of an elastic material, such as silica gel, rubber, etc., and those skilled in the art can flexibly select the material as long as the above-mentioned working process can be realized.

The switching circuit is described below. The switching circuit may be constructed directly from components or may be implemented using a printed circuit board 41.

Fig. 7 shows an exemplary configuration of a switching circuit based on a printed circuit board 41, including the printed circuit board 41 and a pin connector 42.

The switch circuit is arranged on the printed circuit board 41; the printed circuit board 41 is also provided with a pin connector 42;

the pin connector 42 is connected with the switching circuit, and the pin connector 42 is used for outputting an electric signal;

the printed circuit board 41 is connected with the elastic member and the conductive module 3, respectively, to support the elastic member and the conductive module 3.

It should be noted that the structure shown in fig. 7 is adapted to a scenario of dual elastic members, and the conductive module 3 in each elastic member corresponds to one triggering area 44 of the printed circuit board 41. Each trigger area 44 has 8 contacts 43 of trigger lines, and any two contacts can be triggered (i.e. the switch circuit is closed), so that the trigger sensitivity is improved. Furthermore, in other embodiments of the present invention, the trigger region 44 may be surface-plated with gold by a gold plating process, which may improve the corrosion resistance, oxidation resistance, and wear resistance of the trigger region 44.

The switch circuit includes the above-mentioned trigger lines, and when the contacts 43 of any two trigger lines contact the conductive module 3 (e.g., the graphite conductive block 32), the switch circuit is closed.

Of course, a person skilled in the art can set any trigger line to be turned on to close the switch circuit according to needs. Meanwhile, the number of trigger lines in the trigger area 44 can also be flexibly designed: under the condition that any two trigger circuits are designed to be switched on and can be triggered, the number of the trigger circuits is not less than two; under the condition that any one trigger line is designed to be capable of triggering in a conduction mode, the number of the trigger lines is less than one. Still taking the example of fig. 7, the PIN connector 42 may be a 4PIN connector, which is capable of outputting two electrical signals (each requiring 2 PINs). When the conductive module 3 (e.g., graphite conductive block 32) contacts the contact 43 of the activation region 44, the switch circuit is turned on and the 4-PIN connector outputs an electrical signal.

Fig. 8 shows an exemplary structure of the contacts 43 in fig. 7, each contact 43 includes two terminals 431, and a gap exists between the two terminals 431, so that the contacts 43 in fig. 7 look like a line type.

When the conductive module 3 (e.g., the graphite conductive block 32) contacts with the two terminals 431 of any one of the contacts 43, the trigger line to which the contact 43 belongs is conducted. Thus, each trigger line (contact 43) can be considered a switch.

The terminal 431 may be specifically an end point of a printed line on the printed circuit board 41, or a copper foil dot, a metal through hole (the copper foil dot, the metal through hole are connected to the printed line), and the like, and those skilled in the art can flexibly design as long as they can realize a contact function.

Fig. 9 is an electrical schematic diagram of the switching circuit of fig. 7: in fig. 9, 16 contacts 43 in the two activation areas 44 shown in fig. 7 are represented by S1-S16. The 4PIN connector is provided with two paths of electric signal outputs, PIN1 and PIN4 are used for outputting one path of electric signals, and PIN2 and PIN3 are used for outputting one electric signal.

In order to distinguish the two electrical signals, resistors R1 and R2 are connected in series between PIN2 and PIN3, so that the current values of the two electrical signals are distinguished.

The circuit to which PIN1 and PIN4 are connected may be referred to as an on-off circuit, and the circuit to which PIN2 and PIN3 are connected may be referred to as a resistance change circuit. That is, the switching circuit may include a switching circuit and a resistance change circuit.

The on-off circuit includes: contacts S1 to S4, contacts S13 to S16, and printed lines connecting the contacts, PIN1 and PIN 4. Specifically, PIN1 may be connected to 4 contacts represented by S1, S2, S3, and S4 through a printed line (PIN 1 may be connected to one terminal of the 4 contacts, respectively), PIN4 is connected to 4 contacts represented by S13, S14, S15, and S16 (PIN 1 may be connected to one terminal of the 4 contacts, respectively), S1 to S4 form a switch group, S13 to S16 form a switch group, and the two switch groups are connected in series; the two switch sets may be located in two trigger areas, or may be located in the same trigger area.

When any one of the switches (contacts) to which PIN1 is connected and any one of the switches to which PIN4 is connected are simultaneously in contact with a graphite conductive block 32, the on-off circuit is turned on.

The resistance change circuit includes: contacts S5 to S8, contacts S9 to S12, resistors R1 and R2, and printed lines connecting the contacts, resistors R1, R2, PIN2, and PIN 3.

Specifically, PIN2 is connected to 4 contacts indicated at S5, S6, S7, and S8 (PIN 1 may be connected to one terminal of the 4 contacts, respectively) through the printed wiring, and PIN3 is connected to 4 contacts indicated at S9, S10, S11, and S12 (PIN 1 may be connected to one terminal of the 4 contacts, respectively) through the printed wiring. S5-S8 form a switch group, S9-S12 form a switch group, and the two switch groups are connected in series; the two switch sets may be located in two trigger areas, or may be located in the same trigger area. The branch in which the contact is located can be regarded as the aforementioned trigger line.

The conduction principle of the resistance change circuit is similar to that of the aforementioned on-off circuit, and is not described herein again.

For the case that the switch circuit can be closed by turning on any trigger line, still taking fig. 9 as an example, S1-S16 may be designed to be connected in parallel, and the 4PIN connector may be replaced by a 2PIN connector, in which one PIN is connected to one terminal of each switch (contact) and the other PIN is connected to the other terminal of each switch (contact).

Of course, those skilled in the art can also select a design with three springs 21 or even more springs 21, and there may be three or even more trigger areas on the printed circuit board, each trigger area may include a plurality of trigger lines, and any two trigger lines are designed to be electrically connected for triggering (the electrical connection between any two trigger areas can be shown in fig. 9), or any one trigger line is designed to be electrically connected for triggering. And will not be described in detail herein.

Further, the novel car seat sensor further comprises a lower shell 5 and a fixing piece 6.

The lower case 5 is for accommodating the printed circuit board 41;

the fixing member 6 is used to fix the lower case 5 to the vehicle seat.

In one example, the lower housing 5 is made of reinforced nylon plastic, which has good strength and aging resistance, and can withstand large pressure.

In another example, the fixing member is made of a free-cutting steel material, and the surface of the fixing member is galvanized to increase wear resistance and corrosion resistance, so that the lower case 5 can be fixed to the car seat for a long time.

Fig. 10 shows an example of the structure of an alarm system, which includes the controller 7 and the car seat sensor 8 described in any of the above embodiments.

Wherein, the controller 7 is electrically connected with the automobile seat sensor 8.

The controller 7 is configured to: and sending out an alarm signal according to the electric signal sent by the novel automobile seat sensor 8.

Furthermore, the embodiment of the utility model provides a safety belt alarm system is still provided, safety belt alarm system includes the car seat sensor 8 that safety belt switch 9, controller 7 and any above-mentioned embodiment introduced.

The safety belt switch 9, the controller 7 and the novel automobile seat sensor 8 are connected in series.

Wherein, when the safety belt is not fastened, the safety belt switch 9 is in a closed state; the belt switch 9 can have different names, such as a belt loading and unloading detection switch, whose function is to close the belt switch 9 when the belt tongue is inserted into the belt buckle.

The controller 7 is configured to: when the safety belt switch 9 is in a closed state and receives the electric signal sent by the novel automobile seat sensor 8, an alarm signal is sent.

Specifically, when the safety belt is not fastened, the safety belt switch 9 is in a closed state, if a passenger sits on the seat at the moment, the novel automobile seat sensor 8 circuit is conducted and sends an electric signal, the safety belt switch 9, the controller 7 and the novel automobile seat sensor 8 series circuit are conducted, and the controller 7 sends an alarm signal according to the electric signal. If a passenger fastens the safety belt when sitting on the seat, the safety belt switch 9 is changed from a closed state to an open state, although the novel automobile seat sensor 8 sends out an electric signal, the series circuit of the safety belt switch 9, the controller 7 and the novel automobile seat sensor 8 is not conducted, and an alarm signal cannot be sent out.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Claims (8)

1. A novel car seat sensor, its characterized in that, novel car seat sensor includes:

an upper housing;

a plurality of elastic members; the elastic component is connected with at least the upper shell; the elastic force is provided to restore the upper shell to the original position;

a conductive module disposed within the elastic member;

a switching circuit having contacts;

in a natural state, the contact is not in contact with the conductive module, and the switching circuit is in an off state; the contact can contact with the conductive module in the process of compressing the elastic component, and when the contact is in contact with the conductive module, the switch circuit is in a closed state.

2. The novel car seat sensor according to claim 1, wherein said elastic member is made of Mn65 type steel, and a surface of said elastic member is subjected to a bluing heat treatment.

3. The novel car seat sensor according to claim 2, wherein the diameter of said elastic member is in the range of 0.8mm-1.5mm.

4. The novel car seat sensor according to any one of claims 1 to 3, wherein the conductive module comprises a housing and a graphite conductive block;

the graphite conductive block can move along with the shell when the shell deforms so as to realize the contact and separation of the graphite conductive block and the contact; wherein the housing is deformed during compression of the elastic member.

5. The novel car seat sensor according to any one of claims 1 to 3, wherein the switching circuit is provided on a printed circuit board; the printed circuit board is also provided with a pin connector;

the pin connector is connected with the switch circuit and used for outputting an electric signal;

the printed circuit board is connected with the elastic part and the conductive module respectively to support the elastic part and the conductive module.

6. The novel car seat sensor according to claim 5, further comprising:

a lower case for accommodating the printed circuit board;

and the fixing piece is used for fixing the lower shell on the automobile seat.

7. An alarm system, comprising: a controller and the new car seat sensor as claimed in any one of claims 1 to 6, wherein the controller is electrically connected to the new car seat sensor;

the controller is configured to: and sending out an alarm signal according to the electric signal sent by the novel automobile seat sensor.

8. A seat belt warning system, comprising:

a seat belt switch, a controller and a novel car seat sensor as claimed in any one of claims 1 to 6;

the safety belt switch, the controller and the novel automobile seat sensor are connected in series;

wherein, when the safety belt is not fastened, the safety belt switch is in a closed state;

the controller is configured to: when the safety belt switch is in a closed state and receives an electric signal sent by the novel automobile seat sensor, an alarm signal is sent.

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