Passenger sitting posture detection device and method

Abstract

The invention discloses a passenger sitting posture detection device, which comprises a seat and a control device, and is characterized in that the part, in contact with a passenger, of the seat is divided into a plurality of areas, each area is provided with at least one pressure sensor, and all the pressure sensors are in signal connection with the control device; the control device determines the sitting posture of the passenger according to the pressure instantaneous values detected by the pressure sensors in the different areas or the difference of the instantaneous values of the pressure sensors in the different areas. The invention further discloses a passenger sitting posture detection method based on the passenger sitting posture detection device. The sitting posture of the passenger can be judged.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle seats, and in particular to a device and method for detecting the sitting posture of an occupant. Background Art

[0002] US Patent US20210016683A1 discloses a vehicle seat with a compensation system, which includes: at least one temperature and / or humidity sensor; foam; and a measurement system, including at least one capacitive sensor, which is in contact with the foam and is suitable for measuring the pressure applied by the user to the foam, wherein the compensation suitable for the measured pressure is determined based on the temperature and / or humidity provided by the at least one temperature and / or humidity sensor. The patent combines the temperature and humidity sensor to correct the pressure measurement accuracy.

[0003] U.S. Patent US20210213853A1 discloses a vehicle seat with a monitoring system, comprising: a backrest; a seat part connected to the backrest; and - at least one measurement area defined on the backrest and / or the seat part, the at least one measurement area comprising at least one interdigitated capacitive sensor capable of measuring the distance or movement of a user occupying the seat.

[0004] Chinese patent CN111819109A discloses a seat, which includes: sensors, including a first seat cushion sensor disposed on the seat cushion and corresponding to the seat occupant's hip position, a second seat cushion sensor disposed on the seat cushion and located further in front of the first seat cushion sensor, a first backrest sensor disposed at a lower position on the seat back, and a second backrest sensor disposed on the seat back and located above the first backrest sensor; and a control device, which is connected to the sensors and can obtain pressure values ​​from each sensor. The control device is configured to identify the seat occupant's movements based on the output of at least two sensors among the first seat cushion sensor, the second seat cushion sensor, the first backrest sensor, and the second backrest sensor. The patent requires the output of at least two sensors to identify the seat occupant's movements.

[0005] Although the above patent can identify the distance or movement amplitude of the seated person through sensors, it cannot determine the sitting posture of the occupant. Summary of the invention

[0006] One of the technical problems to be solved by the present invention is to provide a passenger sitting posture detection device in view of the problem that the prior art cannot determine the sitting posture of the passenger.

[0007] One of the technical problems to be solved by the present invention is to provide a method for detecting the sitting posture of an occupant in view of the problem that the prior art cannot determine the sitting posture of an occupant.

[0008] In order to achieve the above-mentioned purpose of the invention, the occupant sitting posture detection device of the first aspect of the present invention includes a seat and a control device, the part of the seat that contacts the occupant is divided into several areas, each area is equipped with at least one pressure sensor, all the pressure sensors are connected to the control device signal, and the control device determines the occupant's sitting posture through the instantaneous pressure values ​​detected by the pressure sensors in different areas or the difference in instantaneous values ​​of the pressure sensors between different areas.

[0009] In a preferred embodiment of the present invention, the pressure sensor is one of a piezoresistive pressure sensor, a piezoceramic pressure sensor, and a strain gauge pressure sensor, or a combination of any two or more thereof, preferably an array-type unipolar plate-belt capacitance sensor.

[0010] In a preferred embodiment of the present invention, the portion of the seat that contacts the occupant is divided into several areas, specifically: the upper left area of ​​the backrest, the upper right area of ​​the backrest, the lower left area of ​​the backrest, the lower right area of ​​the backrest, the left front area of ​​the seat cushion, the left rear area of ​​the seat cushion, the right front area of ​​the seat cushion, the right rear area of ​​the seat cushion, the right wing of the backrest, the left wing of the backrest, the left wing of the seat cushion, and the right wing of the seat cushion.

[0011] In a preferred embodiment of the present invention, the dividing line between the upper left area of ​​the backrest and the upper right area of ​​the backrest is the center line of the seat, the dividing line between the lower left area of ​​the backrest and the lower right area of ​​the backrest is the center line of the seat, the dividing line between the left front area of ​​the seat cushion and the right front area of ​​the seat cushion is the center line of the seat, and the dividing line between the left rear area of ​​the seat cushion and the right rear area of ​​the seat cushion is the center line of the seat.

[0012] In a preferred embodiment of the present invention, a perpendicular plane to the torso line is drawn through point H at a point in the area 200mm±20mm upward from the torso line, and the intersection of the perpendicular plane with the seat back surface is the dividing line between the upper left area and the lower left area of ​​the backrest and the dividing line between the upper right area and the lower right area of ​​the backrest.

[0013] In a preferred embodiment of the present invention, the H point is the rotation point where the human body trunk and thigh are connected, that is, the hip point.

[0014] In a preferred embodiment of the present invention, a perpendicular plane to the thigh direction line is drawn through point H to a point in the area 200mm±20mm forward along the thigh direction line, and the intersection line of the perpendicular plane with the surface of the seat cushion is the dividing line between the left front area and the left rear area of ​​the cushion and the dividing line between the right front area and the right rear area of ​​the cushion.

[0015] In a preferred embodiment of the present invention, the pressure sensor includes two states: OFF and ON; when the occupant is sitting upright, the measurement value collected on each pressure sensor is C', and then the real-time measurement value collected on each pressure sensor is C; when C≥C', the pressure sensor state is positioned as ON, and when C<C', the pressure sensor is defined as OFF.

[0016] As a second aspect of the present invention, a method for detecting an occupant's sitting posture comprises the following steps:

[0017] Step 1: When the occupant sits on the seat, the control device collects the measurement value of each pressure sensor;

[0018] Step 2: Determine whether the relationship between the measured values ​​of each pressure sensor corresponds to the relationship formula listed in the table. If yes, proceed to step 3, otherwise return to step 1;

[0019] Step 3: Determine the corresponding sitting posture by looking up the table according to the relationship between the measured values, and proceed to step 4;

[0020] Step 4: Record the duration of each sitting posture during the ride, and proceed to step 5;

[0021] Step 5: Output the corresponding sitting posture and duration records until the process ends.

[0022] In another embodiment of the present invention, the occupant sitting posture detection method comprises the following steps:

[0023] Step 1: When the occupant is sitting on the seat, the control device collects the measurement value C' of each pressure sensor and enters step 2;

[0024] Step 2: Collect the real-time measurement value C of each pressure sensor and proceed to step 3;

[0025] Step 3: Determine the state of each pressure sensor. When C≥C', the pressure sensor state is defined as ON. When C<C', the pressure sensor state is defined as OFF. Go to step 4

[0026] Step 4: Determine whether the state of each pressure sensor corresponds to the state listed in the table, if yes, go to step 5, otherwise return to step 2;

[0027] Step 5: According to the state of each pressure sensor, the corresponding sitting posture is determined by looking up the table, and then proceeding to step 6;

[0028] Step 6: Record the duration of each sitting posture during the ride, and proceed to step 7;

[0029] Step 7: Output the corresponding sitting posture and duration records until the process ends.

[0030] Due to the adoption of the above technical solution, the present invention can determine the sitting posture of the occupant. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the partitions of the seat of the present invention.

[0032] Figure 2 This is one of the flow charts of the occupant sitting posture detection method of the present invention.

[0033] Figure 3 This is the second flow chart of the occupant sitting posture detection method of the present invention.

[0034] Figure 4 Schematic diagram of the normal sitting position of the occupants.

[0035] Figure 5 Schematic diagram of the passenger sitting with his legs crossed on the right side.

[0036] Figure 6 Schematic diagram of the passenger sitting with his left legs crossed.

[0037] Figure 7 Schematic diagram of the passenger's left-leaning sitting position.

[0038] Figure 8 Schematic diagram of the passenger's right-leaning sitting posture.

[0039] Fig. 9 Schematic diagram of the passenger's forward sitting posture.

[0040] Fig.10 Schematic diagram of the passenger sitting with his left foot on tiptoe.

[0041] Fig.11 Schematic diagram of the passenger sitting with his right foot on tiptoe.

[0042] Fig.12 Schematic diagram of the passenger sitting with legs crossed and leaning left.

[0043] Fig.13 Schematic diagram of the passenger sitting with his left legs crossed and leaning right.

[0044] Fig.14 Schematic diagram of the passenger sitting with his legs crossed and leaning left.

[0045] Fig.15 Schematic diagram of the passenger sitting with his legs crossed and leaning right.

[0046] Fig.16 This is a diagram of the lazy lying sitting posture for the passengers.

[0047] Fig.17 Schematic diagram of the passenger's lazy lying + left-leaning sitting posture.

[0048] Fig.18 This is a diagram of the passenger's lazy lying + right-leaning sitting posture. DETAILED DESCRIPTION

[0049] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0050] See also Figure 1 The occupant sitting posture detection device shown in the figure includes a seat 100 and a control device (not shown in the figure). The part of the seat 100 that contacts the occupant is divided into twelve areas (of course, not limited to twelve areas), specifically: an upper left area 110 of the backrest, an upper right area 120 of the backrest, a lower left area 130 of the backrest, a lower right area 140 of the backrest, a left front area 150 of the seat cushion, a left rear area 160 of the seat cushion, a right front area 170 of the seat cushion, a right rear area 180 of the seat cushion, a right wing 210 of the backrest, a left wing 220 of the backrest, a left wing 230 of the seat cushion, and a right wing 240 of the seat cushion.

[0051] At least one pressure sensor C3, C1, C4, C2, C7, C8, C5, C6, C9, C10, C12, C11 is disposed in each of the upper left area 110, the upper right area 120, the lower left area 130, the lower right area 140, the left front area 150, the left rear area 160, the right front area 170, the right rear area 180, the right wing 210, the left wing 220, the left wing 230, and the right wing 240 of the seat cushion. C2, C7, C8, C5, C6, C9, C10, C12, and C11 are connected to the control device signal. The control device determines the sitting posture of the occupant through the instantaneous pressure values ​​detected by the pressure sensors C3, C1, C4, C2, C7, C8, C5, C6, C9, C10, C12, and C11 in twelve areas 110, 120, 130, 140, 150, 160, 170, 180, 210, 220, 230, and 240, or the difference in instantaneous values ​​of pressure sensors between different areas.

[0052] The pressure sensors C3, C1, C4, C2, C7, C8, C5, C6, C9, C10, C12 and C11 are one or a combination of any two or more of the following: piezoresistive pressure sensors, capacitive pressure sensors and strain gauge pressure sensors, preferably array-type unipolar plate-type capacitive sensors.

[0053] The dividing line between the upper left area 110 of the backrest and the upper right area 120 of the backrest is the center line of the seat 100, the dividing line between the lower left area 130 of the backrest and the lower right area 140 of the backrest is the center line of the seat, the dividing line between the left front area 150 of the seat cushion and the right front area 160 of the seat cushion is the center line of the seat, and the dividing line between the left rear area 170 of the seat cushion and the right rear area 180 of the seat cushion is the center line of the seat. The dividing line between the upper left area 110 of the backrest and the lower left area 130 of the backrest and the dividing line between the upper right area 120 of the backrest and the lower right area 140 of the backrest are both perpendicular to the trunk line from a point in the area 200mm±20mm upward from the trunk line through point H, and the intersection of the perpendicular plane with the seat back surface. The dividing line between the left front area and the left rear area of ​​the seat cushion and the dividing line between the right front area and the right rear area of ​​the seat cushion are both perpendicular to the thigh direction line from a point within the area 200mm±20mm forward along the thigh direction line through point H, and the intersection of the perpendicular plane with the surface of the seat cushion.

[0054] Point H is the rotation point where the human torso and thigh are connected, that is, the hip point.

[0055] Pressure sensors C3, C1, C4, C2, C7, C8, C5, C6, C9, C10, C12, C11, including two states: OFF and ON. When the occupant is sitting upright, the measurement value collected on each pressure sensor C3, C1, C4, C2, C7, C8, C5, C6, C9, C10, C12, and C11 is C', and then the real-time measurement value collected on each pressure sensor C3, C1, C4, C2, C7, C8, C5, C6, C9, C10, C12, and C11 is C. When C≥C', the state of the pressure sensors C3, C1, C4, C2, C7, C8, C5, C6, C9, C10, C12, and C11 is defined as ON. When C<C', the state of the pressure sensors C3, C1, C4, C2, C7, C8, C5, C6, C9, C10, C12, and C11 is defined as OFF.

[0056] See also Figures 2 to 18 , a method for detecting a sitting posture of an occupant comprises the following steps:

[0057] Step 1: When the occupant sits on the seat, the control device collects the measurement value of each pressure sensor;

[0058] Step 2: Determine whether the relationship between the measured values ​​of each pressure sensor corresponds to the relationship formula listed in the table. If yes, proceed to step 3, otherwise return to step 1;

[0059] Step 3: According to the relationship between the values, determine the corresponding sitting posture by looking up the table, and proceed to step 4;

[0060] Step 4: Record the duration of each sitting posture during the ride, and proceed to step 5;

[0061] Step 5: Output the corresponding sitting posture and duration records until the process ends.

[0062] In another embodiment of the present invention, the occupant sitting posture detection method comprises the following steps:

[0063] Step 1: When the occupant is sitting on the seat, the control device collects the measurement value C' of each pressure sensor and enters step 2;

[0064] Step 2: Collect the real-time measurement value C of each pressure sensor and proceed to step 3;

[0065] Step 3: Determine the state of each pressure sensor. When C≥C', the pressure sensor state is defined as ON. When C<C', the pressure sensor state is defined as OFF. Go to step 4

[0066] Step 4: Determine whether the state of each pressure sensor corresponds to the state listed in the table, if yes, go to step 5, otherwise return to step 2;

[0067] Step 5: According to the state of each pressure sensor, the corresponding sitting posture is determined by looking up the table, and then proceeding to step 6;

[0068] Step 6: Record the duration of each sitting posture during the ride, and proceed to step 7;

[0069] Step 7: Output the corresponding sitting posture and duration records until the process ends.

[0070] Table 1

[0071]

[0072] Table 2

[0073]

[0074] Table 1 and Table 2 are two different judgment methods. Table 1 first detects the values ​​of the eight sensors in the backrest and seat cushion when sitting upright, and then detects and compares the values ​​of the same sensors relative to the values ​​in the sitting upright state. If it is less than the value in the sitting upright state, the sensor status is displayed as "OFF". If it is greater than or equal to the value in the sitting upright state, the sensor status is displayed as "ON", and the sitting posture is confirmed by looking up the table. Table 2 detects the values ​​of the real-time sensors, compares the values ​​of the two different sensors, and confirms the sitting posture by looking up the table.

[0075] The definitions of various sitting postures of the present invention are shown in Table 3.

[0076] Table 3

[0077]

Claims

1. A passenger sitting posture detection device, comprising a seat and a control device, characterized in that: The portion of the seat that contacts the occupant is divided into several areas, each area is provided with at least one pressure sensor, all the pressure sensors are connected to the control device by signal, and the control device determines the occupant's sitting posture by the instantaneous pressure values ​​detected by the pressure sensors in different areas or the difference in instantaneous values ​​of the pressure sensors between different areas.

2. The occupant sitting posture detection device according to claim 1, characterized in that: The pressure sensor is one of a piezoresistive pressure sensor, a piezoceramic pressure sensor, and a strain gauge pressure sensor, or a combination of any two or more of them.

3. The occupant sitting posture detection device according to claim 1, characterized in that: The pressure sensor is an array-type single-pole plate capacitance sensor.

4. The occupant sitting posture detection device according to claim 1, characterized in that: The part of the seat that contacts the occupant is divided into several areas, specifically: the upper left area of ​​the backrest, the upper right area of ​​the backrest, the lower left area of ​​the backrest, the lower right area of ​​the backrest, the left front area of ​​the seat cushion, the left rear area of ​​the seat cushion, the right front area of ​​the seat cushion, and the right rear area of ​​the seat cushion.

5. The occupant sitting posture detection device according to claim 4, characterized in that: The portion of the seat that contacts the occupant is divided into several areas, specifically the right wing of the backrest, the left wing of the backrest, the left wing of the seat cushion and the right wing of the seat cushion.

6. The occupant sitting posture detection device according to claim 4, characterized in that: The dividing line between the upper left area of ​​the backrest and the upper right area of ​​the backrest is the center line of the seat, the dividing line between the lower left area of ​​the backrest and the lower right area of ​​the backrest is the center line of the seat, the dividing line between the left front area of ​​the seat cushion and the right front area of ​​the seat cushion is the center line of the seat, and the dividing line between the left rear area of ​​the seat cushion and the right rear area of ​​the seat cushion is the center line of the seat.

7. The occupant sitting posture detection device according to claim 4, characterized in that: A perpendicular plane to the torso line is drawn through point H at a point in the area 200mm±20mm upward from the torso line. The intersection of the perpendicular plane and the seat back surface is the dividing line between the upper left area and the lower left area of ​​the backrest and the dividing line between the upper right area and the lower right area of ​​the backrest.

8. The occupant sitting posture detection device according to claim 7, characterized in that: The H point is the rotation point where the human body trunk and thigh are connected.

9. The occupant sitting posture detection device according to claim 4, characterized in that: A perpendicular plane is drawn through point H at a point in the area 200mm±20mm forward from the thigh direction line. The intersection of the perpendicular plane and the seat cushion surface is the dividing line between the left front area and the left rear area of ​​the seat cushion and the dividing line between the right front area and the right rear area of ​​the seat cushion.

10. The occupant sitting posture detection device according to claim 9, characterized in that: The H point is the rotation point where the human body trunk and thigh are connected.

11. The occupant sitting posture detection device according to claim 1, characterized in that: The pressure sensor includes two states: OFF and ON; when the occupant is sitting upright, the measurement value collected on each pressure sensor is C', and then the real-time measurement value collected on each pressure sensor is C; when C≥C', the pressure sensor state is defined as ON, and when C<C', the pressure sensor is defined as OFF.

12. A method for detecting an occupant's sitting posture based on the occupant's sitting posture detection device according to any one of claims 1 to 11, comprising the following steps: Step 1: When the occupant sits on the seat, the control device collects the measurement value of each pressure sensor; Step 2: Determine whether the relationship between the measured values ​​of each pressure sensor corresponds to the relationship formula listed in the table. If yes, proceed to step 3, otherwise return to step 1; Step 3: Determine the corresponding sitting posture by looking up the table according to the relationship between the measured values, and proceed to step 4; Step 4: Record the duration of each sitting posture during the ride, and proceed to step 5; Step 5: Output the corresponding sitting posture and duration records until the process ends.

13. A method for detecting an occupant's sitting posture based on the occupant's sitting posture detection device according to any one of claims 1 to 11, comprising the following steps: Step 1: When the occupant is sitting on the seat, the control device collects the measurement value C' of each pressure sensor and enters step 2; Step 2: Collect the real-time measurement value C of each pressure sensor and proceed to step 3; Step 3: Determine the state of each pressure sensor. When C≥C', the pressure sensor state is defined as ON. When C<C', the pressure sensor state is defined as OFF. Go to step 4 Step 4: Determine whether the state of each pressure sensor corresponds to the state listed in the table, if yes, go to step 5, otherwise return to step 2; Step 5: According to the state of each pressure sensor, the corresponding sitting posture is determined by looking up the table, and then proceeding to step 6; Step 6: Record the duration of each sitting posture during the ride, and proceed to step 7; Step 7: Output the corresponding sitting posture and duration records until the process ends.

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