JP6102340B2 - Belt warning device - Google Patents

Description

  The present invention relates to a belt warning device that prompts an occupant to wear a seat belt when the seat belt is not worn.

  In an automobile, when a seat belt is not worn even though an occupant is seated on a vehicle seat, a warning by a buzzer or the like prompts the user to wear the seat belt. Further, when an occupant is seated in the passenger seat, the airbag is deployed at the time of an accident.

  Therefore, the vehicle seat is provided with a load detection device that detects the load of the occupant, and the occupant is seated when the load detected by the load detection device exceeds a predetermined threshold. It is determined that “sitting is present”, and when it is equal to or less than the threshold value, “not sitting” is determined.

  Patent Document 1 describes an example of an occupant detection device that detects a load acting on a seat to determine the presence or absence of an occupant. In the occupant detection device described in Patent Document 1, load sensors are installed only at two front and rear positions of the four seat mounting portions, and the presence or absence of the occupant is determined from the sum of the two obtained load values. Yes.

  According to the occupant detection device described above, the load sensor is mounted at two places on the left or right side of the seat mounting portion so that the number of load sensors can be minimized and the cost and weight of the device can be reduced. However, the presence or absence of a passenger can be determined.

JP-A-9-207638

  However, in the configuration in which load sensors are installed at two front and rear positions on the left or right side of the seat mounting portion, the load detected by the load detection device when the vehicle suddenly turns increases, and a light load is placed on the vehicle seat. Even in such a case, there is a risk of erroneously recognizing that the passenger is seated and “sitting”.

  As a result, it is determined that there is an occupant even though the occupant is not seated, a warning that the seat belt is not worn is issued, and then the acceleration acting on the vehicle is reduced and detected by the load detection device. When the load is reduced, the warning that the seat belt is not attached is stopped. As described above, there is a possibility that an erroneous warning prompting the user to wear the seat belt may be repeated depending on the running state of the vehicle, which may give the driver discomfort.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. A belt that can quickly determine that a load is being loaded even when suddenly starting or turning, so that a belt warning is not erroneously activated. The object is to provide a warning device.

In order to solve the above-described problem, the feature of the invention according to claim 1 acts on a seat belt that restrains an occupant seated in a vehicle seat at the time of mounting and opens the occupant when not mounted, and a seating surface of the vehicle seat. A load detecting device comprising a pair of left and right load sensors provided at the rear of the vehicle seat for detecting the load, and a warning member for prompting the seat belt to be attached in accordance with the load detected by the load detecting device; A non-sitting state, a non-sitting recognition mode, an occupant seating recognition mode in which it is determined that the occupant is seated and the warning member is in an operation-permitted state; And a control device for setting the load detection device in one of the baggage recognition modes, and the control device is configured to use the load detection device in the non-sitting recognition mode. The process proceeds to luggage recognition mode that it has detected in advance continuously set predetermined time t1 smaller load than the second load greater than the first load condition, the load weight sensor is given in the package identifying mode A transition process for shifting to the non-sitting recognition mode is performed on condition that a smaller load is continuously detected for a preset time, and the first acceleration is applied to the vehicle based on the acceleration characteristics of the vehicle. previously calculated time T required from the load to increase to the second load, the time t1 to transition to the luggage recognition mode in the transition process, a belt warning device is set shorter than the time T.

  A feature of the invention according to claim 2 is that the control device shifts to the occupant seating recognition mode on condition that the load detection device detects a load larger than the second load in the non-sitting recognition mode, 2. The belt warning device according to claim 1, wherein a second transition process for shifting to the non-sitting recognition mode is performed on condition that the load detection device detects a load smaller than the predetermined load in the passenger seating recognition mode. .

  A feature of the invention according to claim 3 is that the load detecting device includes two load sensors arranged on the lower left and right sides of the lower side of the vehicle seat, and the time T is determined by the longitudinal acceleration due to acceleration of the vehicle. 3. The belt warning device according to claim 1, wherein the load detected by the detection device corresponds to a time required for the load to increase from the first load to the second load. 4.

  A feature of the invention according to claim 4 is that the load detection device includes two load sensors arranged on the left and right sides of the lower side of the vehicle seat, and the time T is a lateral force caused by turning of the vehicle. 3. The belt warning device according to claim 1, wherein a load detected by the load detection device by acceleration corresponds to a time required for the load to increase from the first load to the second load. 4.

  According to the first aspect of the present invention, the control device is conditioned on the condition that the load detecting device continuously detects a load larger than the first load and smaller than the second load in a no-sitting recognition mode for a preset time. Transition to the recognition mode, and in the luggage recognition mode, a transition process is performed to transition to the no-sitting recognition mode on condition that the load detection device continuously detects a load smaller than a predetermined load for a preset time. The transition time t1 to the load recognition mode is set to be shorter than the time T until the load is increased from the first load to the second load due to the acceleration characteristics of the vehicle.

  As a result, the load detected by the load detection device is larger than the second load for determining that the occupant is seated due to the influence of the acceleration acting on the vehicle in a state where the load is placed on the seating surface of the vehicle seat. Even before this, since the transition to the luggage recognition mode can be completed before the load becomes larger than the second load, it is possible to avoid issuing an erroneous warning signal when the seat belt is not worn.

  According to the invention of claim 2, the control device shifts to the occupant seating recognition mode on condition that the load detection device detects a load larger than the second load in the no-sitting recognition mode, and the load is detected in the occupant seating recognition mode. Since the second transition process for shifting to the non-sitting recognition mode is performed on condition that the detection device detects a load smaller than a predetermined load, the baggage recognition mode or the passenger seating recognition mode is once determined. The determination does not switch between the mode and the occupant seating recognition mode, and the warning that the seat belt is not worn is not repeated due to a change in the load.

  According to the invention of claim 3, the load detection device is composed of two load sensors arranged on the rear left and right sides of the lower side of the vehicle seat, and the time T is detected by the load detection device based on the longitudinal acceleration due to the acceleration of the vehicle. Since the load applied is equivalent to the time required to increase from the first load to the second load, even when two load sensors are arranged on the left and right sides of the vehicle seat, the vehicle suddenly starts, etc. It is possible to suppress erroneous determination due to the load, and to realize a reduction in cost of the load detection device.

  According to the invention of claim 4, the load detection device is composed of two load sensors arranged on the left and right sides of the lower side of the vehicle seat, and the time T is determined by the lateral acceleration caused by the turning of the vehicle. Since the load detected by the detection device corresponds to the time required to increase from the first load to the second load, this is the case where two load sensors are arranged before and after one of the left and right sides of the vehicle seat. However, it is possible to suppress erroneous determination due to a sudden turn of the vehicle, and to realize a reduction in cost of the load detection device.

It is a perspective view of a vehicle seat provided with a belt warning device showing an embodiment of the invention. It is the figure which looked at the vehicle seat from the upper surface. It is a block diagram of a belt warning device. It is a figure which shows the transition state of a belt warning apparatus. It is a graph which shows the change of the output of the load detection apparatus at the time of sudden start of vehicles. It is a figure which shows the flowchart of a belt warning apparatus. It is the figure which looked at the vehicle seat which shows another modification from the upper surface.

  Hereinafter, an embodiment of a vehicle seat 11 provided with a belt warning device 10 according to the present invention will be described with reference to the drawings. In addition, the directions of “front and rear, left and right, and up and down” used in this specification are described with reference to each direction of the vehicle viewed from the occupant seated on the vehicle seat 11. In the present embodiment, the vehicle is a left-hand drive vehicle, and the presence / absence of a passenger seated in the passenger seat is determined.

  As shown in FIG. 1, a seat cushion 11a as a seating surface on which an occupant is seated and a backrest that is attached to the rear end portion of the seat cushion 11a so as to be pivotable in the front-rear direction. The seat back 11b is provided. Further, the vehicle seat 11 is restrained when the occupant seated on the seat cushion 11a or a load detection device 12 (see FIGS. 2 and 3) for detecting the load of the load and the occupant seated on the vehicle seat 11 are attached. A seat belt 13 that is opened when worn, a buckle switch 14 that detects whether the seat belt 13 is worn or not, and a controller 15 are provided.

  The vehicle seat 11 is supported on the vehicle floor via a pair of left and right upper rails 17 of a seat slide device 16 that supports the vehicle seat 11 so that the position of the vehicle seat 11 can be adjusted in the longitudinal direction of the vehicle. On the pair of left and right upper rails 17, as shown in FIG. 2, four support legs 17 a, 17 b, 17 c, and 17 d that support the seat cushion 11 a of the vehicle seat 11 are separated from each other in the left-right direction and the front-rear direction of the vehicle. The four corners are arranged.

  The load detection device 12 is constituted by two load sensors 12a and 12b, and the load sensors 12a and 12b are strain gauge type sensors incorporating an amplifier. The two load sensors 12a and 12b are interposed between the seat cushion 11a and the upper rail 17 at two positions on the left and right sides of the four support legs 17a to 17d, and the seat cushion of the vehicle seat 11 is provided. The load of an occupant seated on 11a can be detected by two load sensors 12a and 12b.

  As shown in FIG. 1, the seat belt 13 is provided with a tongue plate 20 in the middle thereof, and a buckle 21 detachably attached to the tongue plate 20 is provided at a side portion of the seat cushion 11a. A buckle switch 14 is built in the buckle 21, and when the tongue plate 20 is engaged with the buckle 21, an ON signal is output from the buckle switch 14 assuming that the seat belt 13 is attached. Further, when the tongue plate 20 is not engaged with the buckle 21, the buckle switch 14 outputs an OFF signal on the assumption that the seat belt 13 is not attached.

  FIG. 3 is a block diagram of the belt warning device 10. A controller (ECU) 15 as a control device includes a CPU 33, a RAM 34, a ROM 35, and an interface 36. The ROM 35 stores a belt warning determination program. The load signal detected by the two load sensors 12a and 12b and the ON / OFF signal of the buckle switch 14 of the seat belt 13 are input to the RAM 34 via the interface 36. Further, a warning member 31 that warns that the seat belt 13 is not attached is connected to the CPU 33 via an interface 36. The warning member 31 includes a buzzer, an indicator lamp, and the like, and issues a warning when the seat belt 13 is not attached (the buckle switch 14 is OFF) even though an occupant is seated on the seat cushion 11a. Thus, the user is encouraged to wear the seat belt 13.

  The CPU 33 adds the load signals from the two load sensors 12a and 12b transmitted to the RAM 34, thereby detecting the weight of the passenger seated on the vehicle seat 11 and the weight of the load placed on the vehicle seat 11. . For example, when an occupant or the like is seated in a normal posture on the vehicle seat 11, substantially equal loads are applied to the two load sensors 12a and 12b disposed at the two left and right positions behind the seat cushion 11a. . On the other hand, when an occupant or the like is seated in a posture shifted to the right or left, a large load is applied to one of the two load sensors 12a and 12b, and a small load is applied to the other.

  Accordingly, the load signals detected by the two load sensors 12a and 12b are added by the CPU 33, so that the weight of the passenger seated on the vehicle seat 11 and the weight of the luggage can be detected. Note that the outputs of the load sensors 12a and 12b are zero-calibrated when the vehicle is on a flat ground and nothing is seated or placed on the seat cushion 11a.

  In the RAM 34, a storage area A1 for storing a “no-sitting recognition mode” M1 for recognizing a non-sitting state in which no occupant is seated on the vehicle seat 11, and a state in which the occupant is seated is recognized and the warning member 31 is allowed to operate And a storage area A3 for storing a "cargo recognition mode" M3 for recognizing the loading state and for disabling the warning member 31. Yes.

  As shown in FIG. 4, the controller 15 performs a first transition process 37 and a second transition process 38. The first transition process 37 is performed under the condition that in the “no-sitting recognition mode” M1, the load detection device 12 continuously detects a load larger than the first load W1 and smaller than the second load W2 for a preset time t1. To the “cargo recognition mode” M3, and in the “cargo recognition mode” M3, the load detection device 12 continues the load slightly smaller than the first load W1 and smaller than the third load W3 for a preset time t3. On the condition that it has been detected, the process proceeds to the “non-sitting recognition mode” M1.

  Further, the second transition process 38 performs the “passenger seat recognition” on condition that the load detection device 12 continuously detects a load larger than the second load W2 for a preset time t2 in the “no seating recognition mode” M1. The mode is changed to “M2” and the “occupant seating recognition mode” M2 is performed on the condition that the load detection device 12 continuously detects a load smaller than the third load W3 for a preset time t3. "M1 is to be transferred.

  Here, the time t1 for shifting to the “package recognition mode” M3 is set as described later. It should be noted that the time t3 for shifting to the “non-sitting recognition mode” M1 is preferably set slightly longer than the times t1 and t2.

  This prevents the determination state from changing between the “occupant seating recognition mode” M2 and the “luggage recognition mode” M3, and the load detected by the load detection device 12 in the “luggage recognition mode” M3. Even if the value is increased, a warning signal indicating that the belt is not attached is not erroneously issued.

  In the present embodiment, the basis for determining the “occupant seating recognition mode” M2 as the case where the load detection device 12 detects a load greater than or equal to the second load W2 is that the seat belt 13 is mounted. This is because even when a 6-year-old or older child or a relatively small adult woman who needs a seat sits shallowly on the front portion of the seat cushion 11a, the passenger seating can be detected.

  By the way, in the case where two load sensors 12a and 12b are arranged on the left and right of the rear of the vehicle seat 11, for example, when a load is placed on the seat cushion 11a, two loads are applied during normal traveling. The load value detected by the sensors 12a and 12b does not exceed the second load W2 that determines that the occupant is seated.

  However, when a large acceleration is applied in the front-rear direction of the vehicle seat 11 due to sudden start or acceleration of the vehicle, the weight of the load on the seat cushion 11a is greatly applied to the rear of the seat cushion 11a. The apparent load value detected by the detection device 12 may be larger than the second load W2 that determines that the occupant is seated. Therefore, conventionally, it is determined that the seat belt is not worn even though no occupant is seated on the vehicle seat 11, and a warning signal is erroneously issued from the warning member 31.

  FIG. 5 shows experimental data indicating the output of the load detection device 12 when the vehicle is suddenly started when the vehicle seat 11 is empty. The horizontal axis represents time, and the vertical axis represents the load detected by the load detection device 12. Is shown.

  As shown in FIG. 5, when a large acceleration acts in the front-rear direction on the vehicle seat 11 due to the sudden start of the vehicle, the load value detected by the load detection device 12 increases as indicated by a solid line even when the vehicle seat 11 is empty. I understand that. That is, due to the sudden start of the vehicle, the output of the load detection device 12 rapidly rises to the second load W2 exceeding the first load W1. In this case, the time required to increase from the first load W1 to the second load W2 varies depending on the magnitude of acceleration and the mass of the vehicle seat 11, but is approximately T.

  Therefore, even when a load lighter than the first load W1 or the second load W2 is placed on the vehicle seat 11, the output of the load detection device 12 is output in the second load in a time shorter than T due to sudden start of the vehicle. W2 will be exceeded. For this reason, when the vehicle suddenly starts with a light load placed on the vehicle seat 11, there is a risk of misidentifying that an occupant is seated.

  Therefore, in the present embodiment, the transition time t1 from the “non-sitting recognition mode” M1 to the “package recognition mode” M3 is shorter than the time T, for example, about half of T (t1 = T / 2). ). Note that the time T is a value obtained experimentally or empirically while taking into account the limit characteristic of the vehicle.

  That is, when a load is placed on the vehicle seat 11, the output of the load detection device 12 increases rapidly due to the sudden start of the vehicle. However, by confirming the transition to the “cargo recognition mode” M3 at a time t1 shorter than the above time T, when the output of the load detection device 12 exceeds the second load W2, the “cargo recognition mode” M3 has already been entered. Has been completed, and there is no transition to the “occupant seating recognition mode” M2.

  Next, the belt warning determination program in the above-described embodiment will be described based on the flowchart of FIG. When the ignition switch is turned on, a belt warning determination program is started. Such a belt warning determination program is repeatedly executed at a predetermined sampling period. First, in the “non-sitting recognition mode” M1 in step S100, it is then determined in step S102 whether or not the load detected by the load detection device 12 is greater than the first load W1 (step S102). If the detected load is greater than the first load W1 and the determination result in step S102 is YES, is the load detected by the load detection device 12 in the next step S104 smaller than the second load W2? It is determined whether or not. If the determination result in step S104 is YES, that is, if it is determined that the load detected by the load detection device 12 is within the range of the first load W1 and the second load W2, the determination is made in the subsequent step S106. It is determined whether or not the result has continued for a predetermined time t1 set in advance. If the decision result in the step S106 is YES, in a step S108, it is judged as a “package recognition mode” M3 and stored in the RAM 34 of the controller 15. When the “cargo recognition mode” M3 is determined, the warning member 31 is turned OFF so that the warning member 31 is not operated.

  On the other hand, if the determination result in step S104 is NO, that is, if it is determined that the load detected by the load detection device 12 exceeds the second load W2, in the subsequent step S110, It is determined whether or not the determination result has been continued for a predetermined time t2. If the determination result in step S110 is YES, it is determined in step S112 that the “occupant seating recognition mode” M2 is stored in the RAM 34 of the controller 15. When the “occupant seating recognition mode” M2 is determined, the warning member 31 is turned on. At the same time, an unillustrated airbag display lamp is turned on to notify that the airbag is in an operable state.

  If the determination result in step S106 or step S110 is NO, in other words, if the load in the predetermined range or the load exceeding the predetermined range is not continued for the predetermined time t1 or t2, the process returns to step S100.

  If it is determined in the above-described step S112 that the “occupant seating recognition mode” M2 is established, the load detected by the load detection device 12 is less than or equal to the third load W3 in steps S114 and S116, and the state is set in advance. It is determined whether or not the predetermined time t3 has been continued. For example, when an occupant seated in the vehicle seat 11 gets off the vehicle, the vehicle seat 11 becomes vacant, and the load acting on the vehicle seat is equal to or less than the third load W3, and this continues for time t3, In step S118, the process proceeds to the “non-sitting recognition mode” M1. In step S114 and step S116, when the load detected by the load detection device 12 is not equal to or less than the third load W3 or the state where the load is equal to or less than the third load W3 is not continued for the time t3, “occupant seating recognition mode” M2 is maintained.

  Similarly, in the above-described “package recognition mode” M3, the load detected by the load detection device 12 in step S120 and step S122 is equal to or less than the third load W3, and the state is set for a predetermined time t3. It is determined whether or not it has been continued. For example, when the vehicle is stopped, the load placed on the vehicle seat 11 is removed, and the load acting on the vehicle seat 11 is equal to or lower than the third load W3, which continues for time t3, step S118. The transition is made to the “non-sitting recognition mode” M1.

  As described above, the time t1 for shifting to the “load recognition mode” M3 is set to be shorter than the time T until the second load W2 is increased from the first load W1 due to the acceleration characteristics of the vehicle, thereby acting on the vehicle. Even if the load detected by the load detection device 12 is greater than the second load W2 that determines that the occupant is seated due to the influence of the acceleration, The transition to M3 can be completed. As a result, it is possible to reliably avoid erroneous recognition that the occupant is seated and issuing an erroneous warning signal when the seat belt is not worn.

  According to the above-described embodiment, the controller 15 continuously detects a load larger than the first load W1 and smaller than the second load W2 in the “no-sitting recognition mode” M1 for a preset time t1. On the condition that the load detection device 12 continuously detects a load smaller than the third load W3 for a preset time t3 in the “load recognition mode” M3. A first transition process 37 for shifting to the “non-sitting recognition mode” M1 is performed. In addition, in the “non-sitting recognition mode” M1, the load detection device 12 shifts to the “occupant seating recognition mode” M2 on condition that the load detection device 12 continuously detects a load larger than the second load W2 for a preset time t2. A second transition process for shifting to the “no seating recognition mode” M1 on condition that the load detection device 12 continuously detects a load smaller than the third load W3 for a preset time t3 in the “occupant seating recognition mode” M2. 38. Then, the transition time t1 to the “load recognition mode” M3 in the first transition process 37 is set shorter than the time T until the first load W1 increases to the second load W2 due to the acceleration characteristics of the vehicle.

  As a result, the load detected by the load detection device 12 due to the influence of the acceleration acting on the vehicle in a state in which a load is placed on the seating surface 11a of the vehicle seat 11 is determined to be the second state where the occupant is seated. Even if it becomes larger than the load W2, the “package recognition mode” M3 can be determined before it becomes larger than the second load W2. As a result, it is possible to avoid issuing an erroneous warning signal when the seat belt is not worn.

  In addition, once the “baggage recognition mode” M3 or “occupant seating recognition mode” M2 is confirmed, the determination does not switch between the “baggage recognition mode” M3 and the “passenger seating recognition mode” M2. The warning that the seat belt is not worn is not repeated due to the fluctuation of the load.

  Further, according to the above-described embodiment, the load detection device 12 includes the two load sensors 12a and 12b arranged on the rear left and right sides on the lower side of the vehicle seat 11, and the time t1 is the longitudinal acceleration due to the acceleration of the vehicle. This corresponds to the time required for the load detected by the load detection device 12 to increase from the first load W1 to the second load W2, so that the two load sensors 12a and 12b are provided on the left and right sides of the vehicle seat 11. Even if it is arranged, erroneous determination due to sudden start of the vehicle or the like can be suppressed, and cost reduction of the load detection device 12 can be realized.

  Furthermore, in the above-described embodiment, two load sensors 12a and 12b are arranged on the rear left and right of the lower side of the vehicle seat 11, and it is mistaken that the occupant is seated due to the longitudinal acceleration caused by the sudden start of the vehicle. Although an example in which the determination is not made has been described, as shown in FIG. 7, two load sensors 12 a and 12 b may be arranged before and after either the left or right side of the vehicle seat 11. In this case, even if the load value detected by the load sensors 12a and 12b increases due to the lateral acceleration caused by a sudden turn of the vehicle, it can be prevented that the passenger is erroneously determined to be seated.

  In the above-described embodiment, when the load detection device 12 detects a load larger than the first load W1 and smaller than the second load W2 for a predetermined time, it is determined as the “load recognition mode” M3, and the load detection device 12 detects the second load. When a load larger than W2 is detected for a predetermined time, it is determined as “occupant seating recognition mode” M1, and when the load detection device 12 detects a third load W3 smaller than the first load W1 for a predetermined time, “no seating recognition mode” M1. However, the lower limit load (first load W1) for determining the “cargo recognition mode” M3 and the load (third load) for transition to the “non-sitting recognition mode” M1 have been described. W3) does not necessarily need to be different load values, and may be set to the same value.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited to the configurations described in the embodiments, and can take various forms within the scope described in the claims. Is.

  DESCRIPTION OF SYMBOLS 10 ... Belt warning device, 11 ... Vehicle seat, 11a ... Seating surface (seat cushion), 12 ... Load detection device, 12a, 12b ... Load sensor, 13 ... Seat belt, 14 ... Buckle switch, 15 ... Control device (controller) 31 ... Warning members, 37, 38 ... Transition processing, M1 ... Non-sitting recognition mode, M2 ... Crew seating recognition mode, M3 ... Baggage recognition mode.

Claims (4)

A seat belt that restrains an occupant seated in a vehicle seat when worn and opens when not worn;
A load detection device for detecting a load acting on the seating surface of the vehicle seat,
A warning member that prompts the user to wear the seat belt in accordance with the load detected by the load detection device;
A seatingless recognition mode that is a non-sitting state, an occupant seating recognition mode that determines that an occupant is seated and activates the warning member, and a loading state that determines that a load is placed, and disables the warning member. A control device for switching to one of the baggage recognition modes,
The control device enters the baggage recognition mode on the condition that the load detection device continuously detects a load larger than the first load and smaller than the second load for a predetermined time t1 in the no-sitting recognition mode. A transition process is performed to transition to the no-sitting recognition mode on condition that the load detection device continuously detects a load smaller than a predetermined load for a preset time in the luggage recognition mode,
Based on the acceleration characteristics of the vehicle, a time T required to increase from the first load to the second load when acceleration is applied to the vehicle is calculated in advance.
The transition process to the time t1 to transition to the luggage recognition mode in the time belt warning device is set shorter than T.   The control device shifts to the occupant seating recognition mode on condition that the load detection device detects a load larger than the second load in the non-sitting recognition mode, and the load detection device operates in the occupant seating recognition mode. The belt warning device according to claim 1, wherein a second transition process for shifting to the non-sitting recognition mode is performed on condition that a load smaller than the predetermined load is detected.   The load detection device is composed of two load sensors arranged on the rear left and right on the lower side of the vehicle seat, and the time T is a load detected by the load detection device based on longitudinal acceleration due to acceleration of the vehicle. The belt warning device according to claim 1 or 2, which corresponds to a time required to increase from the first load to the second load. The load detection device includes two load sensors disposed on the left and right sides of the lower side of the vehicle seat, and the time T is detected by the load detection device by lateral acceleration caused by turning of the vehicle. The belt warning device according to claim 1 or 2, wherein the load corresponds to a time required for the load to increase from the first load to the second load.

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