CN113650532A - Automobile driver and passenger sitting posture monitoring system - Google Patents
Automobile driver and passenger sitting posture monitoring system Download PDFInfo
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- CN113650532A CN113650532A CN202111067211.3A CN202111067211A CN113650532A CN 113650532 A CN113650532 A CN 113650532A CN 202111067211 A CN202111067211 A CN 202111067211A CN 113650532 A CN113650532 A CN 113650532A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 10
- 230000003750 conditioning effect Effects 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
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- Seats For Vehicles (AREA)
Abstract
A sitting posture monitoring system for automobile drivers and passengers comprises a headrest pressure sensor, a backrest film type pressure sensor array, a cushion film type pressure sensor array, a seat backrest angle sensor, a microprocessor and an upper computer, wherein the headrest pressure sensor transmits a pressure signal to the microprocessor through a voltage division circuit, a signal conditioning circuit and AD conversion in sequence, and the seat backrest angle sensor transmits an angle signal to the microprocessor through the voltage division circuit, the signal conditioning circuit and the AD conversion; the backrest film type pressure sensor array and the cushion film type pressure sensor array transmit pressure signals to the microprocessor through the signal conditioning circuit and AD conversion, and the upper computer is connected with the microprocessor. The invention saves the control port of the microprocessor, reduces the hardware cost and the space of the data acquisition system, is convenient to be applied to the body pressure detection of the automobile seat, has large measured area and flexible and convenient measurement, and simultaneously improves the precision and the speed of data acquisition.
Description
Technical Field
The invention relates to the technical field of sitting posture monitoring, in particular to a sitting posture monitoring system for automobile drivers and passengers.
Background
The pressure distribution of the automobile driver and passengers on the seat reflects the sitting posture of the automobile driver, the sitting posture of the driver also reflects the driving state of the driver, whether the driving state is highly concentrated or in a relaxed state, the driving and riding modes of the driver and passengers are also improved along with the rapid development of the automobile automatic driving technology, the design of a safety protection system of the driver and passengers is a great challenge, the sitting posture state of the driver and passengers has important influence on the protection effect of the automobile restraint protection system on the driver and passengers, and the recognition of the sitting posture state of the driver and passengers is a fundamental stone designed by the automobile safety protection system.
The traditional and more common driver and passenger sitting posture identification technology is mainly based on an image vision technology, sitting posture image information of a driver is obtained through vision sensors such as a camera, body pressure distribution refers to the state that when a driver and a passenger sit on a seat, the seat reflects the pressure distribution of a human body, the sitting posture state of the driver and the passenger can be reflected through the body pressure distribution information, compared with the vision sensors, the pressure distribution sensors are not affected by environmental factors such as illumination brightness, shielding of the driver and the passenger, dressing of the human body and the like, high-precision body pressure distribution information of the driver and the passenger can be obtained, the sitting posture state of the driver and the passenger can be accurately obtained by fusing seat backrest angle information, and the sensors can be conveniently embedded into the seat.
The pressure sensor is a pressure sensor which is most widely applied at present, and in addition, a data acquisition system matched with the pressure sensor has high cost and complex functions and is not suitable for automobile body pressure distribution data acquisition.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and providing the automobile driver and passenger sitting posture monitoring system which is large in measured area, flexible and convenient in measurement and capable of improving data acquisition precision and speed.
The technical scheme adopted by the invention for solving the technical problems is as follows: a sitting posture monitoring system for automobile drivers and passengers comprises a headrest pressure sensor, a backrest film type pressure sensor array, a cushion film type pressure sensor array, a seat backrest angle sensor, a microprocessor and an upper computer, wherein the headrest pressure sensor transmits a pressure signal to the microprocessor through a voltage division circuit, a signal conditioning circuit and AD conversion in sequence, and the seat backrest angle sensor transmits an angle signal to the microprocessor through the voltage division circuit, the signal conditioning circuit and the AD conversion; the backrest film type pressure sensor array and the cushion film type pressure sensor array transmit pressure signals to the microprocessor through the signal conditioning circuit and AD conversion, and the upper computer is connected with the microprocessor.
Furthermore, the backrest film type pressure sensor array and the cushion film type pressure sensor array are respectively connected with the signal conditioning circuit through pressure sensor resistors, and a channel switching circuit and a parameter initialization circuit are connected in parallel between the pressure sensor resistors and the microprocessor.
Furthermore, the signal conditioning circuit comprises a non-inverting input amplifier, a decoupling circuit and an inverting output amplifier.
Furthermore, the backrest film type pressure sensor array and the cushion film type pressure sensor array both comprise a plurality of transverse sensors and a plurality of longitudinal sensors, the transverse sensors are connected with the signal conditioning circuit through the row scanning circuit, and the longitudinal sensors are connected with the signal conditioning circuit through the column scanning circuit.
Furthermore, the backrest film type pressure sensor array and the cushion film type pressure sensor array respectively comprise six row scanning circuits and seven column scanning circuits.
Further, the row scanning circuit and the column scanning circuit both adopt CD4051 to perform channel switching selection.
Furthermore, the control ports of the CD4051 are all controlled by an I/O port of a controller; the microprocessor comprises a plurality of GPIO ports and at least two DAC channels.
Further, the microprocessor transmits the pressure data to the upper computer through the USB high-speed communication circuit.
Further, the upper computer draws a body pressure distribution diagram through Matlab software.
The row gating switch is used for outputting driving voltage to each row in sequence, each row of sensors is connected with the negative input end of the amplifier, the positive input end of the amplifier is grounded, and then the row gating switch and the inverting amplifying circuit are connected to realize row-column gating single-point measurement of the sensors; the DAC module is adopted for digital-to-analog conversion, and the adjustable stable reference voltage U is outputDAC(ii) a The voltage value and the pressure value amplitude which are finally acquired can be adjusted according to the strength of the actual pressure signal; and input to the in-phase amplifier as the driving voltage for sensing point voltage measurement; voltage data conversion is carried out by using an AD converter in the microprocessor; the array type pressure sensor has piezoresistive effect on each pressure sensing point; when the pressure is applied, the resistance value corresponding to each point changes correspondingly according to the pressure-resistance characteristic curve.
The invention has the advantages of saving the control port of the microprocessor, reducing the hardware cost and the space of the data acquisition system, being convenient to be applied to the detection of the body pressure of the automobile seat, having large measured area and flexible measurement, and simultaneously improving the precision and the speed of data acquisition.
Drawings
FIG. 1 is a schematic view of a vehicle seat sensor arrangement according to the present invention.
Fig. 2 is a system configuration diagram of the present invention.
Fig. 3 is a schematic structural diagram of a back film pressure sensor array and a cushion film pressure sensor array according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a sitting posture detecting effect according to an embodiment of the invention.
In the drawings: 1. a headrest pressure sensor; 2. a back membrane pressure sensor array; 3. a cushion membrane pressure sensor array; 4. a seat back angle sensor.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention:
an embodiment of a monitoring system for the sitting posture of a driver and passengers in an automobile is characterized in that a headrest pressure sensor 1, a backrest film type pressure sensor array 2, a cushion film type pressure sensor array 3 and a seat backrest angle sensor 4 are arranged according to an automobile seat, as shown in figure 1; the backrest film type pressure sensor array 2 and the cushion film type pressure sensor array 3 respectively comprise 44 rows and 52 columns, 2288 pressure sensing points are totally arranged, the length of a sensing area is 36.4cm, the width of the sensing area is 30.5cm, the size of a single-point sensing area is 5mm by 5mm, the sitting pressure and the backrest pressure of a driver and passengers can be detected with high precision, and the pressure sensors at the positions of the headrests assist in pressure detection, so that the pressure distribution of the driver and passengers on the seats can be detected accurately.
As shown in fig. 2 and 3, the headrest pressure sensor 1 transmits a pressure signal to the microprocessor through the voltage division circuit, the signal conditioning circuit and the AD conversion in sequence, and the seat back angle sensor 4 transmits an angle signal to the microprocessor through the voltage division circuit, the signal conditioning circuit and the AD conversion; the backrest film type pressure sensor array 2 and the cushion film type pressure sensor array 3 transmit pressure signals to the microprocessor through the signal conditioning circuit and AD conversion, the microprocessor transmits pressure data to the upper computer through the USB high-speed communication circuit, the upper computer draws a body pressure distribution diagram through Matlab software, and a generated sitting posture detection effect diagram is shown in fig. 4.
As shown in fig. 2 and 3, the backrest film type pressure sensor array 2 and the cushion film type pressure sensor array 3 are respectively connected with the signal conditioning circuit through pressure sensor resistors, and a channel switching circuit and a parameter initialization circuit are connected in parallel between the pressure sensor resistors and the microprocessor; the backrest film type pressure sensor array 2 and the cushion film type pressure sensor array 3 both comprise a plurality of transverse sensors and a plurality of longitudinal sensors, the transverse sensors are connected with the signal conditioning circuit through the line scanning circuit, the longitudinal sensors are connected with the signal conditioning circuit through the column scanning circuit, and the signal conditioning circuit comprises an in-phase input amplifier, a decoupling circuit and an anti-phase output amplifier.
The backrest film type pressure sensor array 2 and the cushion film type pressure sensor array 3 respectively comprise six row scanning circuits and seven column scanning circuits; the row scanning circuit and the column scanning circuit adopt CD4051 to switch and select channels; the control ports of the CD4051 are all controlled by the I/O port of the controller; the microprocessor comprises a plurality of GPIO ports and at least two DAC channels.
Those not described in detail in the specification are well within the skill of the art.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as being within the protection scope of the present invention.
Claims (9)
1. A sitting posture monitoring system for automobile drivers and passengers is characterized by comprising a headrest pressure sensor, a backrest film type pressure sensor array, a cushion film type pressure sensor array, a seat backrest angle sensor, a microprocessor and an upper computer, wherein the headrest pressure sensor transmits a pressure signal to the microprocessor through a voltage division circuit, a signal conditioning circuit and AD conversion in sequence, and the seat backrest angle sensor transmits an angle signal to the microprocessor through the voltage division circuit, the signal conditioning circuit and the AD conversion; the backrest film type pressure sensor array and the cushion film type pressure sensor array transmit pressure signals to the microprocessor through the signal conditioning circuit and AD conversion, and the upper computer is connected with the microprocessor.
2. The system for monitoring the sitting posture of the driver and the passengers in the automobile as claimed in claim 1, wherein the backrest film type pressure sensor array and the cushion film type pressure sensor array are respectively connected with the signal conditioning circuit through pressure sensor resistors, and a channel switching circuit and a parameter initialization circuit are connected in parallel between the pressure sensor resistors and the microprocessor.
3. The system of claim 2, wherein the signal conditioning circuit comprises a non-inverting input amplifier, a decoupling circuit and an inverting output amplifier.
4. The system as claimed in claim 3, wherein each of the backrest film pressure sensor array and the cushion film pressure sensor array comprises a plurality of transverse sensors and a plurality of longitudinal sensors, the plurality of transverse sensors are connected to the signal conditioning circuit through the row scanning circuit, and the plurality of longitudinal sensors are connected to the signal conditioning circuit through the column scanning circuit.
5. The system of claim 4, wherein the array of backrest film pressure sensors and the array of cushion film pressure sensors each comprise six row scanning circuits and seven column scanning circuits.
6. The system as claimed in claim 5, wherein the row scanning circuit and the column scanning circuit both use CD4051 for channel switching selection.
7. The system of claim 6, wherein the control ports of the CD4051 are controlled by the I/O port of the controller; the microprocessor comprises a plurality of GPIO ports and at least two DAC channels.
8. The system as claimed in claim 7, wherein the microprocessor transmits the pressure data to the host computer via a USB high-speed communication circuit.
9. The system as claimed in claim 8, wherein the upper computer maps the body pressure distribution map by Matlab software.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111067211.3A CN113650532A (en) | 2021-09-13 | 2021-09-13 | Automobile driver and passenger sitting posture monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111067211.3A CN113650532A (en) | 2021-09-13 | 2021-09-13 | Automobile driver and passenger sitting posture monitoring system |
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| Publication Number | Publication Date |
|---|---|
| CN113650532A true CN113650532A (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111067211.3A Pending CN113650532A (en) | 2021-09-13 | 2021-09-13 | Automobile driver and passenger sitting posture monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046683A (en) * | 2022-06-16 | 2022-09-13 | 东南大学 | Precision and rapid detection device and method for body posture gravity center of wheelchair passenger |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6392550B1 (en) * | 2000-11-17 | 2002-05-21 | Ford Global Technologies, Inc. | Method and apparatus for monitoring driver alertness |
| CN101318493A (en) * | 2008-05-29 | 2008-12-10 | 吉林大学 | Recognition method for physical sign of vehicle occupant |
| CN102424027A (en) * | 2011-11-14 | 2012-04-25 | 江苏大学 | Device and method for identifying passenger type and sitting posture based on sitting trace |
| CN106996847A (en) * | 2017-05-02 | 2017-08-01 | 贵州航天电器股份有限公司 | A kind of multi-path pressure acquisition system |
| CN108814616A (en) * | 2018-04-12 | 2018-11-16 | 深圳和而泰数据资源与云技术有限公司 | A kind of sitting posture knows method for distinguishing and Intelligent seat |
| CN112193251A (en) * | 2020-10-13 | 2021-01-08 | 一汽解放汽车有限公司 | Driving posture feedback system and method for driver |
-
2021
- 2021-09-13 CN CN202111067211.3A patent/CN113650532A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6392550B1 (en) * | 2000-11-17 | 2002-05-21 | Ford Global Technologies, Inc. | Method and apparatus for monitoring driver alertness |
| CN101318493A (en) * | 2008-05-29 | 2008-12-10 | 吉林大学 | Recognition method for physical sign of vehicle occupant |
| CN102424027A (en) * | 2011-11-14 | 2012-04-25 | 江苏大学 | Device and method for identifying passenger type and sitting posture based on sitting trace |
| CN106996847A (en) * | 2017-05-02 | 2017-08-01 | 贵州航天电器股份有限公司 | A kind of multi-path pressure acquisition system |
| CN108814616A (en) * | 2018-04-12 | 2018-11-16 | 深圳和而泰数据资源与云技术有限公司 | A kind of sitting posture knows method for distinguishing and Intelligent seat |
| CN112193251A (en) * | 2020-10-13 | 2021-01-08 | 一汽解放汽车有限公司 | Driving posture feedback system and method for driver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046683A (en) * | 2022-06-16 | 2022-09-13 | 东南大学 | Precision and rapid detection device and method for body posture gravity center of wheelchair passenger |
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