Seat position sensor

Abstract

The utility model relates to the technical field of vehicle seat equipment, in particular to a seat position sensor, which comprises a shell, the shell is slidably mounted on a rail at a seat, a magnet is arranged on the shell, a Hall chip is arranged in the middle of the bottom end of the magnet, and the magnet is of an annular structure. The Hall chip sends out a low-level signal at the initial position; the Hall sensor further comprises an iron sheet which is a certain distance away from the shell, the iron sheet is located on the moving stroke of the shell, and the iron sheet is used for enabling a low-level signal sent by the Hall chip to overturn when sensing the Hall chip in the shell to form a high-level signal. The controller is in signal connection with the Hall chip and an air bag of the vehicle, and the control system controls the popping force of the air bag according to the monitoring time of the high-level signal sent by the Hall chip and the vehicle speed; the induction process is rapid, and the technical problems that in the prior art, the sensitivity degree of a reed is low, and the air bag blasting adjustment precision of an automobile control system is affected are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle seat equipment, in particular to a seat position sensor. Background Art

[0002] A seat sensor is a device used to detect the state of a seat and adjust the airbag inflation volume based on the position of the occupant, thereby protecting the occupants. For example, patent publication CN205871790U discloses a seat rail position sensor system. In this system, the seat rail includes a lower rail and an upper rail that slides on the lower rail. The position sensor system comprises a detection bracket mounted at the front end of the lower rail and a sensor mounted at the front end of the upper rail. The sensor's base is equipped with a downwardly protruding reed and a contact switch that contacts the reed. When the reed slides against the detection bracket, it is squeezed and deformed, pushing the contact switch to trigger the sensor and generate seat position information. With this setup, when the seat is adjusted forward, the sensor system is triggered, sensing the occupant's position. This in turn notifies the vehicle's control system, which reduces the airbag inflation volume to protect the occupants.

[0003] In the above system, the vehicle control system mainly determines the passenger's position information through the degree of extrusion deformation of the reed. The reed is a hard mechanical structure, and its deformation process takes a certain amount of time, which will reduce the responsiveness of the vehicle control system. At the same time, the deformation ability of the reed will also decrease with aging, which will affect the judgment of the vehicle control system and affect the inflation volume of the airbag explosion. Utility Model Content

[0004] The utility model provides a seat position sensor to solve the technical problem in the prior art that the sensitivity of the reed is low, which affects the accuracy of adjusting the explosion of the air bag by the automobile control system.

[0005] To solve the above problems, the seat position sensor provided by the present invention adopts the following technical solutions:

[0006] The seat position sensor includes a housing that is slidably mounted on a track at the seat. The housing has a magnet. A Hall effect chip is disposed in the middle of the bottom end of the magnet. The magnet is annular in structure so that the Hall effect chip emits a low-level signal when in the initial position.

[0007] It also includes an iron sheet at a certain distance from the shell, the iron sheet is located on the moving stroke of the shell, and is used to flip the low-level signal emitted by the Hall chip into a high-level signal when the iron sheet senses the Hall chip in the shell;

[0008] The controller, whose signal connects the Hall chip and the vehicle's airbag, controls the airbag's popping force based on the monitoring time of the Hall chip sending a high-level signal and the vehicle speed.

[0009] The beneficial effect of the seat position sensor provided by the present invention is: compared with the prior art that uses the deformation of the reed to provide a reference for the judgment of the automobile control system, the present invention uses the signal flipping of the Hall chip to realize the output of different signals, thereby facilitating the controller to accurately sense the changes in the seat position. Among them, the magnet is a ring structure, which can ensure that the Hall chip emits a jet-like low-level signal at the initial position. The Hall chip does not contact the iron sheet. This non-contact sensing method is more stable and effective, and also avoids the phenomenon that the automobile control system judges late due to failure and slow deformation process like the reed, affecting the airbag explosion. The sensing process of the present invention is rapid, which effectively solves the technical problem of low sensitivity of the reed in the prior art, which affects the accuracy of the automobile control system in adjusting the airbag explosion.

[0010] Furthermore, it is defined that the shell moves from rear to front when the vehicle collides, a mounting shell extending forward and backward is arranged at the position of the iron sheet, and the rear end portion of the mounting shell is arranged with the iron sheet.

[0011] Furthermore, the mounting shell is made of plastic material, which can protect the iron sheet, while the plastic material does not affect the signal transmission between the iron sheet and the Hall chip.

[0012] Furthermore, the housing is made of stainless steel to achieve a non-magnetic effect, thereby preventing the housing from affecting the signal of the Hall chip.

[0013] Furthermore, the shell is fixed to a corresponding position of the seat by means of bolts.

[0014] Furthermore, the lower end of the shell has the magnet and the Hall chip, and in the up and down directions, the iron sheet is located at the lower end of the magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0016] Figure 1 A three-dimensional diagram of the seat position sensor provided by the present invention Figure 1 (Iron pieces are not shown);

[0017] Figure 2 A three-dimensional diagram of the seat position sensor provided by the present invention Figure 2(Iron pieces are not shown);

[0018] Figure 3 A partial schematic diagram of the seat position sensor provided by the present invention Figure 1 (Cover not shown);

[0019] Figure 4 A partial schematic diagram of the seat position sensor provided by the present invention Figure 2 (Mounting box and cover not shown);

[0020] Figure 5 It is a schematic diagram of the installation shell and iron sheet in the utility model.

[0021] Description of reference numerals:

[0022] 1. Housing; 2. Magnet; 3. Hall chip; 4. Mounting box; 5. Cover; 6. Mounting shell; 7. Iron sheet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that the main idea of the present invention is that, through the contactless induction cooperation between the Hall chip 3 and the iron sheet 7, the controller can receive the flipping signal, flip the low-frequency signal emitted by the Hall chip 3 into a high-frequency signal, and calculate the distance according to the size and duration of the high-frequency signal. When the seat is far away from the front end, the pop-up force of the airbag can be set to be larger, and when the seat is close to the front end, the pop-up force of the airbag can be set to be smaller, thereby avoiding harm to the human body.

[0025] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. The numbers of any elements in the drawings are for illustration only and not for limitation, and any names are for distinction only and do not have any limiting meaning.

[0026] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0027] Embodiment 1 of the seat position sensor provided by the present invention:

[0028] like Figures 1 to 5As shown, the seat position sensor includes a housing 1, which is slidably mounted on a track on the seat. Housing 1 is provided with a magnet 2, and a Hall effect chip 3 is positioned in the middle of the bottom end of magnet 2. Magnet 2 is annular, ensuring that Hall effect chip 3 emits a low-level signal in its initial position. The ring-shaped structure of magnet 2 ensures that Hall effect chip 3 emits a jet-like low-level signal in its initial position.

[0029] Specifically, the housing 1 has a mounting box 4 , a cover plate 5 is mounted on the mounting box 4 , and the magnet 2 and the Hall chip 3 are arranged in the mounting box 4 .

[0030] The housing 1 is fixed to the corresponding position of the seat by bolts. The lower end of the housing 1 is provided with the magnet 2 and the Hall chip 3. In the up and down direction, the iron sheet 7 is located at the lower end of the magnet 2.

[0031] The seat position sensor also includes an iron sheet 7 at a certain distance from the shell 1. The iron sheet 7 is located on the moving range of the shell 1. The iron sheet 7 is used to flip the low-level signal emitted by the Hall chip 3 to form a high-level signal when sensing the Hall chip 3 in the shell 1; the controller, whose signal connects the Hall chip 3 and the vehicle's airbag, the control system is used to control the popping force of the airbag according to the size and duration of the high-level signal emitted by the Hall chip 3.

[0032] Specifically, it is defined that the housing 1 moves from rear to front when the vehicle collides, and a mounting shell 6 extending forward and backward is arranged at the position of the iron sheet 7 , and the rear end of the mounting shell 6 is arranged with the iron sheet 7 .

[0033] In this embodiment, the mounting shell 6 is made of plastic material, which can protect the iron sheet 7 and does not affect the signal transmission between the iron sheet 7 and the Hall chip 3.

[0034] In addition, the housing 1 is made of stainless steel to achieve a non-magnetic effect, thereby preventing the housing 1 from affecting the signal of the Hall chip 3. The magnetic flux lines do not pass through the stainless steel housing 1 when returning from the N-phase to the S-phase.

[0035] The working principle of the seat position sensor provided by the present invention is: when the vehicle is hit, the seat moves from back to front under the inertial force, and when the Hall chip 3 senses the iron sheet 7 at the front end, the signal emitted by the Hall chip 3 is flipped from a low level to a high level. The controller controls the pop-up force of the airbag according to the signal change and duration, thereby ensuring the safety of the human body. When the seat is far away from the front end, the pop-up force of the airbag can be set to be larger, and when the seat is close to the front end, the pop-up force of the airbag can be set to be smaller.

[0036] Embodiment 2 of the seat position sensor provided by the present invention:

[0037] The main difference between it and Example 1 is:

[0038] In embodiment 1, a mounting shell extending forward and backward is arranged at the position of the iron sheet, and the iron sheet is arranged at the rear end of the mounting shell.

[0039] In this embodiment, the mounting shell may not be provided, and the iron sheet may be fixed on the front side.

[0040] Embodiment 3 of the seat position sensor provided by the present utility model:

[0041] The main difference between it and Example 1 is:

[0042] In embodiment 1, the housing is fixed to a corresponding position of the seat by bolts.

[0043] In this embodiment, the shell is embedded in a corresponding position of the seat.

[0044] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0045] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. Seat position sensor, characterized in that, The housing comprises a housing which is slidably mounted on a track at the seat, the housing having a magnet, a Hall chip arranged in the middle of the bottom end of the magnet, and a ring-shaped magnet so that the Hall chip emits a low-level signal when in the initial position; It also includes an iron sheet at a certain distance from the shell, the iron sheet is located on the moving stroke of the shell, and is used to flip the low-level signal emitted by the Hall chip into a high-level signal when the iron sheet senses the Hall chip in the shell; The controller, whose signal connects the Hall chip and the vehicle's airbag, controls the airbag's popping force based on the monitoring time of the Hall chip sending a high-level signal and the vehicle speed.

2. The seat position sensor according to claim 1, wherein: It is defined that the shell moves from rear to front when the vehicle collides, a mounting shell extending forward and backward is arranged at the position of the iron sheet, and the rear end of the mounting shell is arranged with the iron sheet.

3. The seat position sensor according to claim 2, wherein: The mounting shell is made of plastic.

4. The seat position sensor according to any one of claims 1 to 3, characterized in that: The shell is made of stainless steel to achieve a non-magnetic conductive effect.

5. The seat position sensor according to any one of claims 1 to 3, characterized in that: The housing is fixed at a corresponding position of the seat by means of bolts.

6. The seat position sensor according to any one of claims 1 to 3, characterized in that: The lower end of the shell is provided with the magnet and the Hall chip, and in the up and down directions, the iron sheet is located at the lower end of the magnet.

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