CN214057457U - Detect cushion that human body sat - Google Patents

Abstract

The utility model relates to a detect cushion that human body took a seat, include: the cushion comprises a cushion body, a power circuit, a capacitance sensor, a capacitance digital conversion circuit, a control module and a communication module; the capacitance sensor is composed of an upper electrode layer and a lower electrode layer, the two electrode layers are separated by an insulating layer, resistance switch electrodes are correspondingly distributed on the upper electrode layer and the lower electrode layer, the capacitance electrodes can be arranged on one layer or the upper layer and the lower layer, and the capacitance electrodes and the resistance switch electrodes can be multiplexed; the capacitance electrode is connected with a capacitance digital conversion circuit, and the human body is judged by measuring the self capacitance and the mutual capacitance; then, the through hole on the insulating layer corresponding to the resistance switch electrode is utilized, and the resistance switch electrode is conducted to give a switch signal to the control module under the external pressure so as to judge articles such as a human body, a notebook computer and the like; the product is mainly used for the child seat in the automobile, and the dangerous event that the child is forgotten in the automobile is prevented.

Description

Detect cushion that human body sat

Technical Field

The application relates to a cushion for detecting a person sitting on the cushion, in particular to a cushion matched with a child seat, which is applied to an automobile and used for preventing a child from taking a forgotten malignant event in the automobile.

Background

The child car seat is designed for children with different weights or ages and is an auxiliary seat used for effectively improving the safety of the children taking the car. However, due to the carelessness of guardians, children are often left in the automobile, and then are dehydrated in a high-temperature environment or are anoxic and suffocated when oxygen in the automobile is exhausted, so that the life safety of the children is threatened, and even the children are trapped by the tragedy event without being rescued in time.

Chinese 201510783535.5 discloses a reminder device for installation in a child car seat and a method for operating the reminder device, wherein the reminder device includes a central processing unit, a pressure switch assembly, a power amplification module, a speaker, a bluetooth wireless communication module, a WiFi wireless communication module, and a mobile network communication module, wherein the pressure switch assembly is installed below a seat surface of the child car seat. The reminding device is arranged in the child car seat, so that wireless communication can be carried out between the child and the mobile communication equipment of the guardian when the child is in place, and after the guardian is found to be away from the car for a certain distance, in-place reminding messages are periodically sent to remind the guardian.

Chinese 201510953605.7 discloses an in-car child safety seat alarm system, which mainly uses a gravity sensor for detecting the gravity of a seat and generating gravity information; the motion sensor is used for detecting the motion state of the automobile and generating motion state information; the wireless transceiver is a wireless radio frequency transceiver or a Bluetooth transceiver for alarming.

The Chinese 201610940875.9 patent discloses an intelligent safety monitoring method for a safety seat in a vehicle, which comprises a vehicle, vehicle-mounted OBD hardware, a background management system, a mobile phone and a safety seat, wherein the vehicle-mounted OBD hardware is electrically connected with a circuit in the vehicle, the vehicle-mounted OBD hardware is in pairing communication with the safety seat through Bluetooth, the vehicle-mounted OBD hardware is in communication connection with the background management system, the mobile phone is in communication connection with the background management system, and main sensors of the mobile phone are a safety belt tightness control unit, a chair back tightness control unit and a safety bolster bounce control unit in the safety seat.

Chinese 201710170450.9 discloses a forgetting-proof detection alarm system and method for a child safety seat, the system comprises a seat detection unit for detecting whether the child safety seat has a child, a vehicle flameout detection unit for detecting whether a vehicle stops running and an alarm unit for alarming, the seat detection unit is arranged at the child safety seat, the vehicle flameout detection unit is connected with a power supply end of a vehicle-mounted diagnosis interface, and the seat detection unit and the vehicle flameout detection unit are both connected with the alarm unit; when the seat detection unit detects that a child is on the child safety seat and the power supply end of the vehicle-mounted diagnosis interface does not have output voltage, the alarm unit gives an alarm.

The technical solutions disclosed in the above patents are generally complex and have low cost, which makes the commercialization situation very poor, and affects the product providing the insurance property for children's popularization in the technical field.

Therefore, the company has already submitted a new correction application No. 202020714213.1 to the chinese patent office, and adopted the technical scheme of installing the wire electrode in the cushion body, for example, the foam cushion, but the following problems are found in the actual trial production process: 1. the process cost for manually embedding the electrode wire is not low, particularly at the present day that the labor cost is improved; 2. the structure of the embedded wire electrode is difficult to ensure the consistency of each manually installed product; 3. the jumping of children in use can cause the electrode wire to change, and the product performance is influenced; 4. it is difficult to distinguish a notebook placed in a chair, an IPAD, or even a bottle of water from a seated child.

Chinese patent 201910933818 proposes a technical solution for a fabric sensor in which a flexible printed circuit and a sensing element are printed on a fabric, which has a high manufacturing cost, a limited use condition and a short service life.

Disclosure of Invention

The utility model aims at providing a cushion mainly is that the child safety seat on the car is supporting, solves the condition that detects the human body and take a seat, and rethread communication system is connected with vehicle or cell-phone etc. and carries out the warning from the car, prevents that children from forgetting the emergence of accident on the car, simultaneously, utilizes capacitive sensor's advantage, can also monitor the condition that children urinated wet, simultaneously, needs effectively to distinguish other objects that easy places on car seat such as notebook computer, bottled water and the human body that takes a seat.

The utility model discloses a detect cushion that human body took a seat, include: the cushion comprises a cushion body, a power circuit, a capacitance sensor, a capacitance digital conversion circuit, a control module and a communication module; the capacitance sensor is composed of an upper first electrode layer and a lower first electrode layer and a second electrode layer, the two electrode layers are separated by an insulating layer, and one or more pairs of capacitance electrodes are arranged on the first electrode layer and/or the second electrode layer; the first electrode layer and the second electrode layer close to the insulating layer side are also provided with resistance switch electrodes connected with the control module, and the insulating layer is provided with through holes and an exhaust structure which correspond to the resistance switch electrodes; at least one of the first electrode layer, the second electrode layer and the insulating layer is of a flexible structure; the capacitance digital conversion circuit is connected with the capacitance electrode and comprises a capacitance excitation signal circuit, the capacitance excitation signal circuit generates a high-frequency square wave excitation signal and detects the self capacitance and the mutual capacitance of the capacitance electrode after the capacitance electrode induces the approach of a human body; the capacitance digital conversion circuit is connected with the control module, and the control module is connected with the communication module.

In a capacitance digital conversion circuit (CDC) of the prior art, such as DAI7142 and ADI7147, a delta-sigma modulation method is adopted to directly convert a measured capacitance value into a digital value by charging and discharging the measured capacitance for many times and comparing the measured capacitance value with a reference capacitance (see US Patent Number: 5,134,401), so that the measurement sensitivity of the capacitance can be improved to 1ff level, the requirement of a measurement system on the measurement sensitivity of the capacitance under a safe distance is easily met, and particularly, the design of chips has a plurality of channels, so that the circuit design is simple and convenient, and the cost and the installation difficulty are effectively reduced.

With the development and progress of chip technology, the above mentioned control module (CPU), CDC and communication module are basically integrated on one chip, for example, Cypress CY8C4247 chip, and at this time, the interface for detecting capacitance and I/O port can be configured.

The cushion of the utility model is mainly that two electrode layers forming electrodes are arranged in the cushion, an insulating layer is clamped between the electrode layers, capacitance electrodes and resistance switch electrodes are manufactured on the upper and lower electrode layers, namely the first and second electrode layers, the capacitance electrodes can be a group or a plurality of groups, and can be arranged on the first or second electrode layer or on the first and second electrode layers respectively; the resistance switch electrodes are required to be correspondingly arranged on the first electrode layer and the second electrode layer and are positioned at the side close to the insulating layer, one group of resistance switch electrodes or multiple groups of resistance switch electrodes are required, and at the moment, the through holes are also correspondingly arranged in multiple groups; one of the first electrode layer, the insulating layer and the second electrode layer should be made of a flexible material so that the resistance switch can operate, wherein one of the better choices is that the middle insulating layer is a flexible layer, and the first electrode layer and the second electrode layer can also be flexible;

the capacitive electrode is connected to a capacitive digital conversion circuit CDC, the resistive switch electrode is actually an upper layer electrode and a lower layer electrode, and the corresponding insulating layer is provided with a through hole and an exhaust device communicated with the through hole; as for whether communication is made or not, depending on pressure, size of the via hole, thickness of the insulating layer, and the like; therefore, the present patent uses the capacitance-to-digital conversion circuit to detect the changes of self-capacitance and mutual capacitance after the human body approaches to judge the sitting condition of the human body, and uses the resistance switch sensor which is conducted by the pressure change of the upper and lower interlayer resistance electrodes at the through hole of the middle insulation layer to distinguish the articles such as notebook computer and the like from the human body of the child; because the capacitor electrode and the resistance switch electrode can not generate conflict, the more preferable scheme is to combine the two electrodes into one, the structure is simple, the cost is low, the manufacture is convenient, and simultaneously, because of the foundation of the capacitance sensor, the device can also detect the conditions of the urine wetting of children and the like; the technical scheme has very low manufacturing cost and very reliable performance, and creates conditions for the commercial popularization and application of products with the insurance property.

The exhaust device is used for enabling the resistance switches of the first electrode layer and the second electrode layer corresponding to the through holes to freely sense pressure to act, and therefore, a groove can be arranged on the insulating layer, or a small hole is formed in one or two of the upper resistance electrode and the lower resistance electrode corresponding to the through holes to communicate with the through holes.

The self-capacitance is sensitive to the approach and contact of most objects, and can effectively judge whether the objects approach or contact; the mutual capacitance is only sensitive to a small amount of objects such as human bodies, metal, water and the like, so most other objects (such as computer bags, plastic toys, leather bags, paper boxes and the like) can be filtered out through the mutual capacitance; the pressure sensor can detect the pressure of an object, and the detection threshold value can be adjusted, so that some objects which cannot be filtered by the mutual capacitance can be filtered by the pressure sensor, for example, the pressure sensor is set to be a pressure threshold value of 2Kg, if a bottle of 600ml water is put on, the detection conditions of the self-capacitance and the mutual capacitance can be met, but the pressure sensor cannot be triggered, so that objects such as metal, water and the like below 2Kg can be filtered. Therefore, through the cooperation of the self-capacitance, the mutual capacitance and the pressure sensor, most objects and human bodies can be effectively distinguished, and the detection requirement is met.

The scheme of the film sensor is that a film process is utilized to combine the pressure sensor with a capacitance sensor, wherein the electrodes of the upper layer and the lower layer are used for judging according to capacitance change detection after a human body is seated, and the upper electrode and the lower electrode are contacted and conducted at the position of a through hole due to pressure compression, so that the pressure sensor is embodied as a pressure sensor, namely a resistance sensor, more specifically a pressure switch, and the pressure sensor is embodied as a resistance open circuit and a short circuit caused by conduction. Through the structure, the comprehensive application of the capacitance sensor and the resistance switch type pressure sensor can be realized by matching with a simple detection circuit, so that the realized function targets are as follows: the method can completely meet the following technical points by detecting the sitting of a human body of a child with the age of 0-12 years, the height of less than 160cm and the weight of 2-40 kg: (1) the detection cannot be missed for seated children (2kg-40 kg). (2) Common articles placed on the cushion are not mistakenly detected as children as far as possible, and the probability of false alarm by misjudgment is reduced.

In fact, can correspond on the upper and lower electrode film and set up the multiunit electrode, also have the multiunit through-hole of course, rely on the electric capacity situation detection of every group electrode, whether the simple pressure that whether electrode communicates of every group through-hole judges, can draw the form of the object on the whole cushion, distinguish very easily with the form of human buttock relatively fixed.

The product can be made into a movable cushion, and at the moment, the product is required to be powered by a battery, so that the sensor system is required to work with micro power consumption.

The communication module referred to herein comprises: the automobile seat cushion comprises a Bluetooth communication module, a wireless network communication module and a mobile network communication module, particularly, the seat cushion is arranged in an automobile, and the communication module is connected with an automobile system.

Drawings

FIG. 1 is a schematic representation of electrodes in a seat cushion being approached by a child when the child is seated on the seat cushion, as expressed in their self-capacitance;

FIG. 2 is a schematic view of electrodes in a seat cushion being approached by a child when the child is seated on the seat cushion, expressed in terms of their mutual capacitance;

fig. 3, a cross-sectional view of a three-layer structure. FIG. 3-1 is a schematic diagram of the first layer of electrodes being common electrodes for the two-electrode pressure switch and the detection electrode, and FIG. 3-2 is a schematic diagram of the first layer of electrodes being common electrodes for the three-electrode pressure switch and the detection electrode;

fig. 4 a schematic view of the first layer of electrodes. FIG. 4-1 is a diagram of an electrode layout with two electrodes for the first layer of electrodes, and FIG. 4-2 is a diagram of an electrode layout with three electrodes for the first layer of electrodes;

FIG. 5 is a schematic illustration of an intermediate layer; FIG. 5-1 is a diagram of an interlayer layout for a first layer of electrodes as two electrodes, and FIG. 5-2 is a diagram of an interlayer layout for a first layer of electrodes as three electrodes;

FIG. 6 is a schematic view of a second layer electrode; FIG. 6-1 is a diagram of an electrode arrangement with two electrodes for the first layer of electrodes, and FIG. 6-2 is a diagram of an electrode arrangement with three electrodes for the first layer of electrodes;

FIG. 7 is an enlarged cross-sectional view of a resistive pressure switch configuration;

FIG. 8 is a top plan view of a schematic representation of an electrode arrangement for an embodiment of a seat cushion with sensors and circuitry;

fig. 9 is a block circuit diagram of the present patent application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to all the drawings, particularly fig. 3-1, 3-2, 8 and 9, the utility model discloses a cushion for detecting human body sitting on, which comprises: the cushion comprises a cushion body 500, a power circuit 420, a capacitance sensor, a capacitance digital conversion circuit 410, a control module 410 and a communication module 430; the capacitance sensor is composed of an upper first electrode layer 100 and a lower second electrode layer 200, the two electrode layers are separated by an insulating layer 300, and one or more pairs of capacitance electrodes (110, 120) are arranged on the first and/or second electrode layers; resistance switch electrodes (130, 210) connected with the control module are also arranged on the first electrode layer and the second electrode layer close to the insulating layer side, and through holes 310 and exhaust structures 320 corresponding to the resistance switch electrodes are arranged on the insulating layer; at least one of the first and second electrode layers (100, 200) and the insulating layer 300 is a flexible structure; the capacitance digital conversion circuit CDC is connected with the capacitance electrode and comprises a capacitance excitation signal circuit, the capacitance excitation signal circuit generates a high-frequency square wave excitation signal and detects a self-capacitance and a mutual capacitance of the capacitance electrode after the capacitance electrode induces the approach of a human body; the capacitance digital conversion circuit is connected with the control module MCU, and the control module MCU is connected with the communication module 430.

The electrode forms may be various and are arranged according to the structure and convenience of detection, in the embodiment shown in fig. 3-1, the circular electrode 110 on the first electrode layer 100 and the circular electrode 210 on the second electrode layer 200 form a pair of resistance switch electrodes which are in contact communication with each other under a certain pressure through the through hole 310 of the middle insulation layer 300, as shown in the schematic diagram of the circuit in fig. 9, after the electrodes 110 and 210 are conducted, the I/O port of the control module MCU may detect a level signal change indicating that pressure is applied; in this figure, the electrodes 110 and 120 on the first electrode layer 100 form capacitive electrodes, and the circuit diagram of fig. 9 shows that the capacitive electrodes (110, 120) are connected to the digital capacitance conversion circuit CDC; under this scheme, the electrode 110 is not only a capacitance electrode, but also a resistance switch electrode, playing a role of multiplexing, and certainly, more groups of electrodes may be arranged on the first electrode layer and/or the second electrode layer, and the shape of the electrode may be circular, long-strip, or other suitable shapes; referring to fig. 3-2, the scheme is that two capacitance electrodes 110, 120 are disposed on the first electrode layer 100, and are distributed at two ends, meanwhile, a resistance switch electrode 130 is disposed on the first electrode layer at the middle position, and a resistance switch electrode 210 on the second electrode layer 200 is correspondingly disposed, and the two electrodes are located above and below the through hole 310 of the middle insulating layer 300; in general, the resistance switch electrode is conducted by contacting two electrodes, and therefore, it is necessary to dispose the resistance switch electrode on the side of the insulating layer adjacent to the first and second electrode layers, and the capacitance electrode does not have such a requirement; the resistance switch electrodes can be one group or multiple groups, and at the moment, the through holes are also arranged corresponding to the multiple groups; one of the first electrode layer, the insulating layer and the second electrode layer should be made of a flexible material so that the resistance switch can operate, wherein one of the better choices is that the insulating layer in the middle is a flexible layer, or the first electrode layer and the second electrode layer are flexible, and the flexible layer can provide elasticity for the resistance switch under pressure;

FIGS. 4-1, 5-1, 6-1 constitute a three layer embodiment corresponding to the split representation of FIG. 3-1 above; in the insulating layer 300 of fig. 5-1, a trench 320 is formed beside the via 310, which is a venting structure solution for the via to communicate with the atmosphere, and alternatively, a small hole 330 (see fig. 7) is formed in one or both of the upper and lower resistive switching electrodes corresponding to the via to communicate with the via 310. Figures 4-2, 5-2, 6-2 constitute a three layer embodiment shown separately corresponding to figure 3-2 above.

In fig. 8, the inside of the cushion body 500 is schematically shown, and the electrodes 110 and 120 are connected to an integrated chip 400 by wires 510, which constitutes the sensor of the main invention of this patent.

The self-capacitance and mutual-capacitance measurement method embodied in fig. 1 and 2, particularly based on the principle of detecting human body sitting on self-capacitance and mutual-capacitance, can be referred to patent documents 202010157222.X and 202010198553.8, which are already published in this application.

The seat sensor of this patent has overcome the problem in the aspects such as product uniformity that the 202020714213.1 application of original this company application exists, and in the technical scheme of this patent, capacitor electrode and resistance switch electrode can adopt silver thick liquid and the compound silk screen printing technology of carbon thick liquid to make wherein.

Due to the development of chip technology, the capacitance-to-digital conversion circuit CDC, the control module MCU and the communication module may already be integrated on one chip, and reference numeral 400 schematically shown in fig. 8 is the chip of the whole sensor, including the capacitance-to-digital conversion circuit CDC listed in fig. 9 and the control module MCU (410), the communication module 430 and the DC power supply module 420; the three functional chips of CDC, MCU and Bluetooth are respectively responsible for the functions of capacitance conversion, control and wireless transmission, or a chip integrating the three functions (such as CY8C4247 of Cypress) can be adopted, and in addition, a power supply management module is arranged on the core mainboard. Advances in chip technology may even allow for software configuration of chip ports, i.e., ports configured to accept capacitive sense signals or I/O ports that accept resistive switch signals. Further, for multiple sets of capacitive electrodes, the configuration may be in a self-capacitance or mutual-capacitance mode by software.

The utility model discloses have following apparent advantage:

1. the self-capacitance module, the mutual capacitance module and the pressure module are integrated into a component, and the total thickness can reach below 0.5 mm;

2. the material can be formed in one step through a stamping die;

3. the sensor has high consistency and stability and good feasibility of mass production;

4. the film can be formed by intramembrane injection molding, the volume production cost is lower, and the full mechanization is free from manual intervention.

The system scans the states of the electrodes and the resistance pressure switches according to a certain frequency, and when the capacitance of the electrodes reaches a preset threshold value and the pressure switches are switched to a switch-on state from a switch-off state, a child is judged to sit on the cushion. Whether a child sits on the seat cushion or not is judged through comprehensive analysis of information of the capacitor and the pressure switch.

After the system is started, if the system is not connected with an upper computer, the deep sleep state is entered, a timer is used for waking up once every certain time (the interval time can be set), and relevant capacitance, electric quantity and temperature information are detected. When a child sits on the seat cushion, the film keys are immediately switched on, and the system is immediately awakened at the moment and carries out operations such as detection, judgment, control and the like. Through the cooperation of button and timer, guaranteed detection effect again when the power saving. The quantity of multiunit capacitance electrode, resistance switch and the size of perception pressure in the whole scheme, visual cushion size and specific demand come the adjustment. This detection scheme designs according to the form of child's buttock, and after child sat on the cushion, can trigger electric capacity detection condition, can make the button short circuit again, and objects such as notebook can not trigger simultaneously.

For the alarm requirement, the communication module connected with the MCU can comprise: the vehicle-mounted communication system comprises a Bluetooth communication module, a wireless network communication module and a mobile network communication module, and particularly after the vehicle enters the vehicle, the communication module can be connected with a vehicle system, such as Bluetooth connection.

Although specific embodiments of the present invention have been described above, those skilled in the art will readily appreciate that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims (10)

1. A seat cushion for detecting seating of a person, comprising: the cushion comprises a cushion body, a power circuit, a capacitance sensor, a capacitance digital conversion circuit, a control module and a communication module; the capacitance sensor is characterized by comprising an upper first electrode layer and a lower second electrode layer, wherein the two electrode layers are separated by an insulating layer, and one or more pairs of capacitance electrodes are arranged on the first electrode layer and/or the second electrode layer; the first electrode layer and the second electrode layer close to the insulating layer side are also provided with resistance switch electrodes connected with the control module, and the insulating layer is provided with through holes and an exhaust structure which correspond to the resistance switch electrodes; at least one of the first electrode layer, the second electrode layer and the insulating layer is of a flexible structure; the capacitance digital conversion circuit is connected with the capacitance electrode and comprises a capacitance excitation signal circuit, the capacitance excitation signal circuit generates a high-frequency square wave excitation signal and detects the self capacitance and the mutual capacitance of the capacitance electrode after the capacitance electrode induces the approach of a human body; the capacitance digital conversion circuit is connected with the control module, and the control module is connected with the communication module.

2. A seat cushion for detecting the seating of a human body as defined in claim 1, wherein at least one set of capacitive electrodes is disposed on the first and second electrode layers.

3. A seat cushion for detecting the seating of a human body as defined in claim 1, wherein at least one set of capacitive electrodes is disposed on the first or second electrode layer.

4. The seat cushion for detecting the seating of a human body as claimed in claim 1, wherein the resistive switching electrodes disposed on the first and second electrode layers are at least one group, and the insulating layer corresponding to each group of resistive switching electrodes has at least one through hole.

5. A seat cushion for detecting the seating of a human body as defined in claim 1, 2, 3 or 4, wherein the capacitive electrode and the resistive switching electrode are formed as a single body structure on a side adjacent to the insulating layer.

6. The seat cushion for detecting the sitting of a human body as claimed in claim 1, wherein the through hole of the insulating layer is communicated with the air exhausting structure, and the air exhausting structure is an air exhausting hole of the resistance switch electrode on one side or two side electrode layers corresponding to the groove or the through hole on the insulating layer.

7. A seat cushion for detecting the seating of a human body as defined in claim 1, wherein said communication module includes: the device comprises a Bluetooth communication module, a wireless network communication module and a mobile network communication module.

8. A seat cushion for detecting the seating of a human body as defined in claim 5, wherein said seat cushion is provided in a vehicle, and said communication module is connected to a vehicle system.

9. A seat cushion for detecting the seating of a person as defined in claim 1, wherein said insulating layer is of a flexible construction.

10. A seat cushion for detecting the seating of a human body as defined in claim 1, wherein said first electrode layer and said second electrode layer are flexible structures.

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