JP6120095B2 - Vehicle seating detection device - Google Patents

Description

  The present invention relates to a vehicle seating detection device for detecting a seating state on a vehicle seat.

  2. Description of the Related Art An airbag device and a seat belt device with a pretensioner are well known as an occupant protection device for reducing an impact given to an occupant during a vehicle collision. The airbag apparatus needs to control the operation method according to the passenger | crew who is seated on the vehicle seat. That is, when an adult is seated in the vehicle seat, it is necessary to prevent the collision with the interior member in the passenger compartment by operating the airbag device and holding the occupant's body. On the other hand, when the child seat holding the infant is secured on the vehicle seat, the infant may be damaged by the operation of the airbag device. Therefore, a device for discriminating an occupant seated on the vehicle seat is required for controlling the operation of the airbag device.

  As a conventional technique related to a seating detection device for discriminating an occupant seated on a vehicle seat, a load sensor for detecting a seat load is attached to the vehicle seat, and the airbag device is operable or activated based on a detection value by the load sensor. Some have been set to one of the prohibited states (see, for example, Patent Document 1). In the seating detection device according to this prior art, the detection value of the load sensor is corrected as an initial value every time it is determined that there is no occupant by the occupant presence / absence determination sensor provided in the seat cushion. This is because the load sensor detects when no occupants are seated on the vehicle seat and no luggage is placed due to stress generated when the vehicle seat is attached to the vehicle, aging deterioration of the vehicle seat itself, vehicle collision, etc. This is because the detected value is corrected with respect to the change in value. As described above, by correcting the initial value of the load sensor, it is possible to accurately detect the seating state of the occupant and the loading state of the load on the vehicle seat regardless of the secular change of the vehicle seat.

JP 2000-280813 A

  By the way, in the seating detection device according to the above-described prior art, as a passenger presence / absence determination sensor for detecting that no passenger is seated on the vehicle seat and no luggage is placed, the seat cushion pad and the skin The use of a pressure sensitive film sensor or a capacitance sensor provided between the two is disclosed. However, it has been very difficult to accurately detect the absence of an occupant or the like on the vehicle seat using these sensors. In other words, in the case of a pressure-sensitive film sensor, the detection value varies depending on the position and the way the occupant sits on the vehicle seat, so it may be determined that there is no occupant on the vehicle seat despite being seated. It was. Also, when a small luggage is placed on the vehicle seat, it may be determined that no luggage or the like is accidentally placed. In addition, the capacitance sensor also has a problem that the detection sensitivity differs between when an occupant is seated on a vehicle seat and when a load is placed.

In addition, the above-described prior art describes that a non-contact type sensor such as an infrared sensor or an ultrasonic sensor mounted on an instrument panel may be used as an occupant presence / absence determination sensor. However, even with infrared sensors and ultrasonic sensors, it is difficult to accurately detect occupants sitting at an angle on a vehicle seat, reclining occupants, and very small loads placed on the vehicle seat. Met.
The present invention has been made in view of the above circumstances, and an object of the present invention is to accurately detect that no occupant is seated on the vehicle seat and that no luggage is placed, and the detected value of the load sensor. An object of the present invention is to provide a vehicle seating detection device that can accurately correct the above.

  In order to solve the above-mentioned problem, the invention of the vehicle seat detection device according to claim 1 is attached to the seat (13a) of the vehicle seat (13) and detects a seating load applied to the seat. A vehicle seat detection device (1) comprising: a detection means (2); and a seating determination means (8d) for determining a seating state in the vehicle seat based on the seating load detected by the load detection means, Image creating means (3, 8e) for photographing the upper part of the seat to form seat image data, and vacant seat image storing means (8f) for storing vacant seat image data formed by photographing the vacant seat state of the vehicle seat. ), And image comparison means (8g) for determining whether or not the sheet image data formed by the image creation means is the same as the vacant seat image data stored in the vacant seat image storage means, and the image comparison means, If the over preparative image data is determined to be equal to the vacant image data, and a, and initialization means (8i) for executing 0-point correction for the initial value of values detected by the load detecting means.

  According to this configuration, it is determined by the image comparison unit whether or not the sheet image data formed by the image creating unit is the same as the vacant seat image data stored in the vacant seat image storing unit, and the sheet image data is determined as the vacant seat image data. When it is determined that they are the same, the initialization unit executes zero-point correction using the detection value by the load detection unit as an initial value, so that the vehicle seat is based on the sheet image data formed by the image generation unit. The vacant seat state of the vehicle is accurately detected and the occupant sits at an angle on the vehicle seat, the occupant sits on the reclining vehicle seat, the very small luggage is placed on the vehicle seat, etc. It is possible to prevent erroneous determination as a vacant seat state. For this reason, it is possible to improve the setting accuracy of the initial value for the detection value of the load detection means, and to optimize the operation of the airbag device or the like.

The block diagram which showed the structure of the seating detection apparatus for vehicles by Embodiment 1 of this invention. Side view schematically showing the vehicle seat for the passenger seat The figure which showed the flowchart of automatic 0 point correction control in Embodiment 1. Front view showing an unoccupied passenger seat vehicle seat Front view showing a vehicle seat for a passenger seat in a state where an occupant is seated The figure which showed the flowchart of the first zero point correction | amendment control performed manually in Embodiment 2. Front view showing a vehicle seat for the passenger seat in a state where another cushion material is placed on the seat cushion The figure which showed the flowchart by the modification of the flowchart shown in FIG. The figure which showed the flowchart of automatic zero point correction control by Embodiment 3.

Hereinafter, a state where the occupant PA is not seated on the vehicle seat 13 and no luggage is placed is referred to as an empty seat state. The initial value is a value detected by the seat load sensor 2 when the seating controller 8 recognizes that the vehicle seat 13 is in an empty seat state. The zero point correction means that when the vehicle seat 13 is in a predetermined state, the seating controller 8 recognizes the detection value by the seat load sensor 2 at that time as an initial value.
Hereinafter, in the case of the seating state of the vehicle seat 13, a state where an adult or an infant is seated on the vehicle seat 13, a state where a child seat (not shown) is attached to the vehicle seat 13, a luggage on the vehicle seat 13 This includes all states such as a state where the vehicle is placed and a state where nothing is present on the vehicle seat 13. Further, in the case of the seating load of the vehicle seat 13, not only the load generated in the seat cushion 13 a of the vehicle seat 13 in the state where an adult or an infant is seated on the vehicle seat 13, but also a child seat is attached to the vehicle seat 13. This includes a load generated on the seat cushion 13a of the vehicle seat 13 in a state in which a luggage or the like is placed or in an empty seat state.

<Embodiment 1>
A vehicle seating detection apparatus 1 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5. The vehicle seating detection device 1 according to the present embodiment includes a plurality of seat load sensors 2 (for load detection means) attached to a seat cushion 13a (corresponding to a seat) of a passenger seat vehicle seat 13 (shown in FIG. 2). Applicable). In FIG. 1, only one seat load sensor 2 is shown comprehensively.
As shown in FIG. 2, the vehicle seat 13 includes a seat cushion 13a on which the occupant PA is seated, and a seat back 13b that is pivotally attached to the rear end of the seat cushion 13a in the front-rear direction and serves as a backrest of the occupant PA. And. A headrest 13c that supports the head of the occupant is attached to the upper end of the seat back 13b. On the floor 12a of the vehicle 12, a pair of left and right lower rails 13d (only the left one is shown in FIG. 2) of the vehicle seat 13 are fixed. A pair of left and right upper rails 13e (shown only on the left side in FIG. 2) are engaged with the lower rail 13d so as to be movable in the front-rear direction. The seat cushion 13a includes a seat frame 13f, and the seat load sensor 2 is interposed between the upper rail 13e and the seat frame 13f. The seat load sensor 2 is a load sensor formed by a strain gauge or the like. A seat load applied to the seat 13a by an occupant PA seated on the vehicle seat 13 or a load placed on the vehicle seat 13 is measured. Detected. In the present invention, the type, type, and detection principle of the seat load sensor 2 are not limited to specific ones.

The vehicle seating detection apparatus 1 includes an in-vehicle camera 3. The in-vehicle camera 3 is mounted in the passenger compartment and takes an image above the seat cushion 13a (shown in FIG. 2). In the present embodiment, the in-vehicle camera 3 is formed by a CCD camera, but is not limited thereto, and may be a CMOS camera, a MOS camera, an infrared camera, or the like. The in-vehicle camera 3 corresponds to an image creating unit together with an image processing unit 8e described later.
As shown in FIG. 1, the vehicle seating detection apparatus 1 includes a shift lever switch 4 (corresponding to vehicle stop detection means). The shift lever switch 4 detects the position of the shift lever that switches the operation of the transmission (not shown) of the vehicle 12.
The vehicle seating detection device 1 includes a vehicle speed sensor 5 (corresponding to a vehicle stop detection means and a vehicle speed sensor). The vehicle speed sensor 5 detects the speed of the vehicle 12 from the rotational speed of the output shaft of the transmission.
The vehicle seating detection apparatus 1 includes an operation unit 6. The operation unit 6 is provided in the vehicle interior, and operates the seating controller 8 when operated by the occupant PA, as will be described later, and manually performs the zero point correction of the seat load sensor 2.
The vehicle seating detection apparatus 1 includes an ignition switch 7. The ignition switch 7 is a device that is provided in the vehicle 12 and operates an ignition device of an engine (not shown).

  The seat load sensor 2, the in-vehicle camera 3, the shift lever switch 4, the vehicle speed sensor 5, the operation unit 6, and the ignition switch 7 described above are connected to the seating controller 8. The seating controller 8 is a control device formed by an input / output device (not shown), a CPU, a RAM, and the like. The seating controller 8 may be used also as, for example, an airbag ECU. The seating controller 8 will be described later.

An audio ECU 9 provided in the vehicle 12 is connected to the seating controller 8. The on-board display 10 and the speaker device 11 are connected to the seating controller 8 via the audio ECU 9.
The on-vehicle display 10 provided in the passenger compartment is controlled by the audio ECU 9 based on the operation of the occupant PA, and displays a television image or the like. The on-board display 10 displays an operation screen for zero point correction when the occupant PA operates the operation unit 6 as described later.
The speaker device 11 is controlled by the audio ECU 9 based on the operation of the occupant PA, and generates sound in the passenger compartment. In addition, the speaker device 11 generates an operation message for zero point correction when the occupant PA operates the operation unit 6.

The seating controller 8 described above includes a load calculation unit 8a, a load storage unit 8b, a load difference determination unit 8c, a seating determination unit 8d, an image processing unit 8e, an image data storage unit 8f, an image data comparison unit 8g, and a vehicle stop determination unit 8h. And a zero-point correction execution unit 8i.
The load calculation unit 8a calculates the load applied to the seat cushion 13a based on the detection value of the seat load sensor 2.
The load storage unit 8b (corresponding to the seating load storage means) stores a last load that is an initial value when the previous zero point correction is executed.
The load difference determination unit 8c (corresponding to the load difference determination means) is a seating that is a difference between the current detection value newly detected by the seat load sensor 2 and the last load stored in the load storage unit 8b. A load difference is calculated, and it is determined whether the seating load difference is equal to or less than a predetermined threshold value.
The seating determination unit 8d (corresponding to the seating determination unit) determines the seating state on the vehicle seat 13 based on the load value calculated by the load calculation unit 8a, and determines the occupant PA seated on the vehicle seat 13. ing.
The image processing unit 8e performs image processing on the detection value obtained by the in-vehicle camera 3 to form sheet image data.
The image data storage unit 8f (corresponding to the vacant seat image storage means) stores vacant seat image data formed by photographing the vacant seat state of the vehicle seat 13 by the in-vehicle camera 3 or other camera devices.
The image data comparison unit 8g (corresponding to the image comparison unit) determines whether the sheet image data newly formed by the image processing unit 8e is the same as the vacant seat image data stored in the image data storage unit 8f. To do.
The vehicle stop determination unit 8h determines whether or not the vehicle 12 is in a stopped state based on detection values obtained by the shift lever switch 4 and the vehicle speed sensor 5.
When the image data comparison unit 8g determines that the sheet image data is the same as the vacant seat image data, the zero point correction execution unit 8i (corresponding to the initialization unit) initializes the detection value by the seat load sensor 2 at that time. Execute zero point correction as a value.

  Next, the automatic zero point correction control method according to the present embodiment will be described with reference to FIGS. Prior to the start of this control, vacant seat image data is stored in the image data storage unit 8f in advance. The vacant seat image data is formed by photographing the vacant seat state (shown in FIG. 4) of the vehicle seat 13 by the in-vehicle camera 3 or other camera device at the vehicle factory when the vehicle 12 is shipped. The load storage unit 8b stores a last load that is an initial value when the vehicle 12 is shipped or when the zero point correction is executed last time.

As shown in FIG. 3, first, based on the detection values by the shift lever switch 4 and the vehicle speed sensor 5, the vehicle stop determination unit 8h determines whether or not the vehicle 12 has stopped (step S101). In the present embodiment, when the shift lever switch 4 is in the P range position and the vehicle speed sensor 5 detects that the speed of the vehicle 12 is equal to or lower than a predetermined threshold, the vehicle 12 is in a stopped state. It is determined that there is. When the vehicle 12 is not stopped, this control is finished.
When the vehicle 12 is stopped, whether or not the sheet image data newly taken by the in-vehicle camera 3 and formed by the image processing unit 8e is the same as the vacant seat image data stored in the image data storage unit 8f. The image data comparison unit 8g determines (Step S102). For example, when the occupant PA is seated on the vehicle seat 13 (shown in FIG. 5), and the newly formed seat image data is different from the vacant seat image data, and it is determined that the vehicle seat 13 is not vacant. This control ends.
When it is determined that the seat image data is the same as the vacant seat image data and the vehicle seat 13 is in the vacant seat state, the load difference determination unit 8c stores the current detection value by the seat load sensor 2 and the load storage unit 8b. A seating load difference, which is a difference from the stored previous load, is calculated, and it is determined whether or not the seating load difference is equal to or less than a predetermined threshold (step S103). When the seating load difference is larger than the threshold value, this control ends. When the seating load difference is equal to or less than the threshold value, the zero point correction execution unit 8i executes zero point correction using the current detection value by the seat load sensor 2 as an initial value (step S104). The automatic zero point correction control described above may be executed every time a predetermined period elapses depending on the aging deterioration state of the seat load sensor 2 and the like.
In the above-described automatic zero point correction control, when the image data comparison unit 8g determines that the sheet image data is the same as the vacant seat image data, in addition to the case where the sheet image data and the vacant seat image data are completely the same. Thus, there is a slight difference between the seat image data and the vacant seat image data due to slight deformation of the seat cushion 13a or the seat back 13b, changes in the brightness of the passenger compartment, noise generated in the image data, and the like. Includes cases to do.

  According to the present embodiment, it is determined by the image data comparison unit 8g whether or not the sheet image data formed by the image processing unit 8e is the same as the vacant seat image data stored in the image data storage unit 8f. Is determined to be the same as the vacant seat image data, the zero point correction execution unit 8i executes zero point correction using the detection value of the seat load sensor 2 at that time as an initial value, whereby the image processing unit 8e The vacant seat state of the vehicle seat 13 is accurately detected based on the formed seat image data, and the occupant PA is sitting on the vehicle seat 13 at an angle, and the occupant PA is sitting on the reclining vehicle seat 13. It is possible to prevent erroneous determination of a state in which a very small luggage is placed on the vehicle seat 13 as an empty seat state. For this reason, it is possible to improve the setting accuracy of the initial value for the detection value of the seat load sensor 2 and to optimize the operation of the airbag apparatus and the like.

In addition, the shift lever switch 4 and the vehicle speed sensor 5 for detecting the stop state of the vehicle 12 are provided. The zero-point correction execution unit 8i detects the stop state of the vehicle 12 by the shift lever switch 4 and the vehicle speed sensor 5. In this case, the zero point correction is performed to prevent the seat load sensor 2 from detecting the load generated on the vehicle seat 13 due to the vibration or acceleration of the vehicle 12 while the vehicle 12 is traveling, thereby executing the zero point correction. The initial value setting accuracy can be further improved.
The vehicle 12 has a shift lever switch 4 and a vehicle speed sensor 5 as means for detecting the stop state. The shift lever switch 4 is in the P range position, and the vehicle speed sensor 5 When it is detected that the speed of the vehicle 12 is equal to or lower than a predetermined threshold, it is possible to secure redundancy for detecting the stop state of the vehicle 12 by detecting that the vehicle 12 is in a stop state. Can be reliably determined to be in a stopped state.

  Further, the load storage unit 8b that stores the last load that is the initial value when the previous zero point correction is executed, the current detection value that is newly detected by the seat load sensor 2, and the load storage unit 8b are stored. A load difference determination unit 8c that calculates a seating load difference that is a difference from the previous load and determines whether or not the seating load difference is equal to or less than a predetermined threshold, and a zero point correction execution unit 8i includes: When the load difference determination unit 8c determines that the seating load difference is equal to or less than a predetermined threshold value, the in-vehicle camera 3 has failed to shoot the load on the vehicle seat 13 by executing the zero point correction. In this case, even when the sensors are out of order, an increase in the seating load difference in that case is detected, and the zero point correction execution unit 8i is prevented from erroneously performing the zero point correction, thereby further improving the initial value setting accuracy. Can be improved.

<Embodiment 2>
Based on FIGS. 6 to 8, the first manual zero-point correction control method according to the second embodiment will be described. In this control, sheet image data newly captured by the in-vehicle camera 3 and formed by the image processing unit 8e is stored in the image data storage unit 8f as vacant seat image data, and at the same time, the zero point correction execution unit 8i Then, zero point correction using the detection value by the seat load sensor 2 as an initial value is executed. For this reason, this control is referred to as initial zero point correction control. Note that the configurations of the vehicle seating detection device 1 and the vehicle seat 13 according to the present embodiment have the same configurations as those shown in FIGS. 1 and 2.

As shown in FIG. 6, first, when the passenger PA operates the operation unit 6, an operation screen is displayed on the on-board display 10, and the speaker device 11 generates an operation message, thereby starting this control. (Step S201). The occupant PA can check the progress of this control by the operation screen by the on-vehicle display 10 and the operation message by the speaker device 11. Next, based on the detection values by the shift lever switch 4 and the vehicle speed sensor 5, the vehicle stop determination unit 8h determines whether or not the vehicle 12 has stopped (step S202). Also in this embodiment, when the shift lever switch 4 is in the P range position and the vehicle speed sensor 5 detects that the speed of the vehicle 12 is equal to or lower than a predetermined threshold, the vehicle 12 is stopped. Determined. When the vehicle 12 is not stopped, this control is finished. When the vehicle 12 is stopped, the sheet image data formed by the image processing unit 8e is stored in the image data storage unit 8f as vacant seat image data based on the image newly taken by the in-vehicle camera 3. S203). Therefore, for example, a vehicle-mounted camera shows a state in which a cushion material CS different from the seat cushion 13a is placed on the vehicle seat 13 (shown in FIG. 7) or a child seat is secured on the vehicle seat 13. 3 can be stored in the image data storage unit 8f as empty seat image data. In this case, the vacant seat image data stored in the image data storage unit 8f is not originally image data formed by photographing the vacant seat state of the vehicle seat 13, but the vacant seat image in the first embodiment (step S102). It has the same function as data. After the image data storage unit 8f stores the vacant seat image data, the zero point correction execution unit 8i executes zero point correction using the current detection value by the seat load sensor 2 as an initial value (step S204). After the initial zero point correction control according to the present embodiment is completed, the automatic zero point correction control described in the first embodiment is repeatedly executed as appropriate.
In the present embodiment, a step similar to step S103 in the first embodiment may be provided after step S202 (indicated by step S303 in FIG. 8). In this case, even when the cushion material CS is placed on the vehicle seat 13 or when the child seat is secured, the threshold of the seating load difference is implemented so that the zero point correction is executed. It is necessary to set larger than in the case of the first mode.

  According to the present embodiment, new sheet image data is formed by the image processing unit 8e based on the operation of the occupant PA, and the image data storage unit 8f stores the sheet image data as vacant seat image data. The correction execution unit 8i executes zero point correction using the detection value by the seat load sensor 2 when vacant seat image data is formed as an initial value. As a result, the occupant PA can store the desired seat image data in the image data storage unit 8f as vacant seat image data, so that the cushion material CS is placed on the vehicle seat 13 or the child seat. The zero point correction can be executed in the daily use state of the occupant PA, such as a state where the vehicle is secured.

<Embodiment 3>
Based on FIG. 9, a method of automatic zero-point correction control according to the third embodiment will be described. This control is obtained by slightly modifying the automatic zero point correction control according to the first embodiment. The configurations of the vehicle seating detection device 1 and the vehicle seat 13 according to this embodiment are the same as those shown in FIGS. 1 and 2.
First, it is determined whether or not the ignition switch 7 provided on the vehicle 12 has been switched from the on state to the off state (step S401). If the ignition switch 7 is not operated to the OFF state, the process proceeds to step S403. When the ignition switch 7 is switched to the OFF state, the timer starts to operate (step S402). As a result, the load calculation unit 8a, the load storage unit 8b, the load difference determination unit 8c, the image processing unit 8e, the image data storage unit 8f, the image within the in-vehicle camera 3 and the seating controller 8 only during the predetermined time during which the timer is operating. Electric power is supplied to the data comparison unit 8g, the vehicle stop determination unit 8h, and the zero point correction execution unit 8i, and the data comparison unit 8g becomes operable. Thereafter, as in the case of the first embodiment, whether or not the vehicle 12 has stopped is determined by the vehicle stop determination unit 8h based on the detection values by the shift lever switch 4 and the vehicle speed sensor 5 (step S403). When the vehicle 12 is not stopped, this control is finished. When the vehicle 12 is stopped, whether or not the sheet image data newly taken by the in-vehicle camera 3 and formed by the image processing unit 8e is the same as the vacant seat image data stored in the image data storage unit 8f. The image data comparison unit 8g determines (Step S404). When the newly formed seat image data is different from the vacant seat image data and it is determined that the vehicle seat 13 is not vacant, this control is terminated. When it is determined that the seat image data is the same as the vacant seat image data and the vehicle seat 13 is in the vacant seat state, the load difference determination unit 8c stores the current detection value by the seat load sensor 2 and the load storage unit 8b. A seating load difference that is a difference from the stored previous load is calculated, and it is determined whether or not the seating load difference is equal to or less than a predetermined threshold (step S405). When the seating load difference is larger than the threshold value, this control ends. When the seating load difference is less than or equal to the threshold value, the zero point correction execution unit 8i executes zero point correction using the current detection value by the seat load sensor 2 as an initial value within a predetermined time during which the timer is operating. (Step S406). Thereafter, it is determined whether or not the timer is operating (step S407). In step S401, when the ignition switch 7 is not operated in the OFF state, the timer is not operated, and in this case, the present control ends. If the timer is in operation, the timer is stopped (step S408), and then this control ends.

  According to this embodiment, when the ignition switch 7 is switched from the on state to the off state, power is supplied to the in-vehicle camera 3 and the seating controller 8 for a predetermined time, and zero point correction is executed within the predetermined time. By doing so, it is possible to capture the opportunity when the ignition switch 7 is in a vacant seat state and the vehicle 12 is highly likely to stop, and turn off from the on state, and reliably perform the zero point correction. it can.

<Other embodiments>
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows.
The vehicle seating detection apparatus 1 according to the present invention can be applied not only to the passenger seat vehicle seat 13 but also to the rear seat vehicle seat.
Further, the number of seat load sensors 2 provided on the vehicle seat 13 may be any number, and the attachment position can be selected according to the situation.
Further, as a means for detecting the stop of the vehicle 12, only one of the shift lever switch 4 and the vehicle speed sensor 5 may be used, or a device other than these may be applied.

  In the drawings, 1 is a vehicle seating detection device, 2 is a seat load sensor (load detection means), 3 is an in-vehicle camera (image creation means), 4 is a shift lever switch (vehicle stop detection means), and 5 is a vehicle speed sensor ( Vehicle stop detection means, vehicle speed sensor), 7 an ignition switch, 8b a load storage section (sitting load storage means), 8c a load difference determination section (load difference determination means), 8d a seating determination section (seat determination means), 8e is an image processing unit (image creation unit), 8f is an image data storage unit (vacant seat image storage unit), 8g is an image data comparison unit (image comparison unit), 8i is a 0 point correction execution unit (initialization unit), 12 Denotes a vehicle, 13 denotes a vehicle seat, 13a denotes a seat cushion (seat portion), and PA denotes an occupant.

Claims (6)

Load detecting means (2) attached to the seat (13a) of the vehicle seat (13) and detecting a seating load applied to the seat;
A seating determination unit (8d) for determining a seating state in the vehicle seat based on the seating load detected by the load detection unit;
A vehicle seat detection device (1) comprising:
Image creating means (3, 8e) for photographing the upper part of the seat and forming sheet image data;
Vacant seat image storage means (8f) for storing vacant seat image data formed by photographing the vacant seat state of the vehicle seat;
Image comparing means (8g) for determining whether or not the sheet image data formed by the image creating means is the same as the vacant seat image data stored in the vacant seat image storing means;
Initialization means (8i) for performing zero-point correction using the detection value by the load detection means as an initial value when the image comparison means determines that the sheet image data is the same as the vacant seat image data;
A vehicle seat detection device. Vehicle stop detection means (4, 5) for detecting the stop state of the vehicle (12),
The initialization means includes
The vehicle seating detection device according to claim 1, wherein the zero point correction is executed when the vehicle stop detection unit detects a stop state of the vehicle. The vehicle stop detection means is
The vehicle has a shift lever switch (4) and a vehicle speed sensor (5), the shift lever switch is in a P range position, and the vehicle speed sensor allows the vehicle speed to be below a predetermined threshold. The vehicle seating detection device according to claim 2, wherein when it is detected that the vehicle is stopped, the vehicle seating detection device is detected. A seating load storage means (8b) for storing the last load which is the initial value when the previous zero point correction is executed;
A seating load difference that is a difference between a value detected by the load detecting unit and the previous load stored in the seating load storage unit is calculated, and it is determined whether the seating load difference is equal to or less than a predetermined threshold value. Load difference determination means (8c) to perform,
With
The initialization means includes
The vehicle seating according to any one of claims 1 to 3, wherein the zero point correction is executed when the load difference determination unit determines that the seating load difference is equal to or less than a predetermined threshold value. Detection device. The vacant seat image storage means includes:
Based on the operation of the occupant, the sheet image data formed by the image creating means is stored as the vacant seat image data,
The initialization means includes
The vehicle according to any one of claims 1 to 4, wherein the first zero-point correction is executed based on a value detected by the load detection unit when the vacant seat image data is formed based on an occupant's operation. Seating detection device. An ignition switch (7) provided on the vehicle (12),
When the ignition switch is switched from the on state to the off state, power is supplied to the image creating means, the image comparing means, and the initialization means for a predetermined time, and the 0 point is within the predetermined time. The vehicle seating detection device according to any one of claims 1 to 5, wherein the correction is executed.

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