JP5151873B2 - Sheet device - Google Patents

Description

  The present invention relates to a seat device capable of tilting a seat back with respect to a seat cushion by a rotational drive of a motor.

  Conventionally, an electric seat disclosed in Patent Document 1 below is known as a seat device in which a seat back can be tilted with respect to a seat cushion by a rotational drive of a motor. In this electric seat, when the seat (seat) is moved by supplying a current to the motor via the power supply circuit, the value of the current flowing in the power supply circuit exceeds a predetermined threshold value, and the seat is the limit of the moving range. If it is not in the position, it is determined that pinching has occurred between the seat and the other member, and the motor is reversely rotated to release the pinching.

Further, in the power storage seat for a vehicle disclosed in Patent Document 2 below, a Hall IC that generates a pulse corresponding to the rotation of the motor for moving the seat body to the seating position or the storage position is provided. Then, the amount of movement of the sheet body is detected by the number of pulses counted from the Hall IC, and when the amount of change in this pulse exceeds a predetermined allowable amount, the motor is overloaded, that is, the foreign object is caught by the sheet body Then, the motor is stopped or reversely driven to release the pinching.
JP 2007-331716 A JP 2006-082626 A

  However, in order to detect the value of the current flowing in the power supply circuit as in Patent Document 1, predetermined hardware is required, which not only increases the manufacturing cost due to component costs and mounting costs, but also increases the mounting area. Therefore, there is a problem that downsizing of the control device (ECU) is hindered.

  Moreover, in order to detect pinching according to the amount of change in pulses as in Patent Document 2, a dedicated detection means that enables highly accurate pulse measurement is required. Furthermore, in the pulse measurement as described above, it is necessary to set a large margin for the detection threshold in order to suppress the influence of power supply voltage fluctuation, actuator characteristics, temperature, seat mass, vehicle body inclination, etc., and the pinching detection load increases. There is a problem of end up.

  SUMMARY An advantage of some aspects of the invention is that it provides a sheet device that can detect pinching without providing a dedicated detection unit.

In order to achieve the above object, in the seat device according to claim 1, the seat cushion (22) supported by the floor surface (B) and the seat attached to the seat cushion so as to be tiltable. Interposed between a back (21), a motor (31) for tilting or raising the seat back with respect to the seat cushion, and a rotating shaft (31b) of the seat cushion and the motor, Rotation of the rotating shaft for raising the seat back by urging the seat back forwardly with respect to the seat cushion by elastic deformation according to rotation of the rotating shaft for tilting the seat back forward An urging member (34) for urging the seat back in an upright direction with respect to the seat cushion by elastic deformation in accordance with the motor, and driving the motor A motor drive control means (40) for controlling, a tilt angle detecting means (36) for detecting a tilt angle (θs) of the seat back with respect to the seat cushion, and a rotation angle (θm, θg) of the rotating shaft are detected. Rotation angle detection means (35), and the motor drive control means is configured to provide the motor when a relative angle difference (Δθ) between the rotation angle and the tilt angle is equal to or greater than a predetermined threshold (Δθp ₁ , Δθp ₂ ). The rotating shaft is rotated by a predetermined amount in a direction opposite to the immediately preceding rotational direction.

  In the seat device of claim 1, an urging member is interposed between the seat cushion and the rotating shaft of the motor, and the urging member is elastic according to the rotation of the rotating shaft for tilting the seat back forward. The seat back is urged in the forward tilt direction with respect to the seat cushion by the deformation, and the seat back is urged in the standing direction with respect to the seat cushion by elastic deformation according to the rotation of the rotation shaft for raising the seat back. The motor drive control means is configured such that the relative angle difference between the rotation angle of the rotation shaft detected by the rotation angle detection means and the tilt angle of the seat back with respect to the seat cushion detected by the tilt angle detection means is equal to or greater than a predetermined threshold value. The rotation shaft of the motor is rotated by a predetermined amount in the opposite direction to the previous rotation direction.

  When the urging member is elastically deformed according to the rotation of the rotating shaft, the seat back is tilted forward or in the standing direction with respect to the seat cushion by the urging force (elastic force) according to the elastic deformation of the urging member. . At this time, if a foreign object or the like is sandwiched between the seat cushion and the seat back, the tilting angle of the seat back and the rotation angle of the rotating shaft are merely the elastic deformation of the urging member without changing the tilting angle of the seat back. And the relative angular difference increases.

  Therefore, a predetermined threshold value is set in advance according to the relative angle difference that can be determined that pinching has occurred, and it is determined that pinching has occurred when the relative angle difference is equal to or greater than the predetermined threshold value. It is possible to detect pinching without providing means. Further, since the relative angle difference according to the elastic deformation of the urging member is used, it is possible to reliably detect the pinching without being affected by power supply voltage fluctuations, actuator characteristics, and the like.

  In the seat device of the second aspect, a link mechanism is provided which supports the seat cushion so as to move relative to the floor surface by elastic deformation of the biasing member according to the rotation of the rotating shaft. As a result, when a foreign object or the like is caught in any of the links during the operation of the link mechanism that uses the rotation of the motor via the biasing member, the relative angle difference described above becomes equal to or greater than a predetermined threshold value. It is possible to detect pinching.

  In the seat device according to the third aspect, the predetermined threshold is set according to the tilt angle. Thus, for example, when the threshold value in the tilt angle range close to the forward tilt state is set to be smaller than the threshold value in the tilt angle range close to the standing state, the forward tilt state in which the head or neck is highly likely to be caught. Even when the pinching load generated at the time of pinching in the vicinity is relatively small, pinching can be reliably detected.

  Hereinafter, an embodiment of a seat device of the present invention will be described with reference to the drawings. First, the structure of the sheet | seat apparatus 10 which concerns on this embodiment is demonstrated based on FIGS. FIG. 1 is a side view showing a schematic configuration of a sheet apparatus 10 according to the present embodiment. FIG. 2 is a perspective view showing the frame structure of the seat device 10 from the left front. FIG. 3 is a perspective view showing the frame structure of the seat apparatus 10 from the front right. 4A is a side view showing the seat body 20 in a standing state and a seated state, and FIG. 4B is a side view showing the seat body 20 in a forward tilted state and a stored state. FIG. 5 is a block diagram showing an electrical configuration of the reclining device 30.

  As shown in FIG. 1, the seat device 10 according to the present embodiment mainly includes a base 11 fixed to the vehicle body B, and a pair of front links 12 and a pair of rear links 13 on the base 11. And a reclining device 30 for tilting the seat back 21 of the seat body 20 with respect to the seat cushion 22.

  As shown in FIGS. 2 to 4, both the front links 12 have lower ends connected to the front portion of the base 11 so as to be relatively tiltable, and upper ends are connected to the front of the seat cushion frame 22 a of the seat cushion 22. It is connected to the lower surface of the part so as to be capable of relative tilting. In addition, the rear links 13 are connected to the base 11 so that the lower ends of the rear links 13 can be relatively tilted, and the upper ends of the rear links 13 are connected to the lower surface of the rear portion of the seat cushion frame 22a. Further, the rear links 13 are configured to tilt at the same time by fixing their upper ends to the connecting shaft 14 rotatably supported by the seat cushion frame 22a. Thereby, a parallel link mechanism is configured, and the seat body 20 moves in a horizontal state with respect to the base 11 in a seated state (see FIG. 4A) or a stored state (see FIG. 4B). Become. In addition, a substantially semicircular link side gear 13 a is formed at each upper end portion of both rear links 13.

  The seat back 21 is supported by the seat back frame 21a, and a connecting shaft 21b for connecting the left and right sides is fixed to the lower end of the seat back frame 21a. The seat cushion 22 is supported by a seat cushion frame 22a. The seat body 20 is configured such that the seat back 21 is supported so as to be relatively tiltable with respect to the seat cushion 22 by the connecting shaft 21b being supported by the upper end portion of the seat cushion frame 22a so as to be relatively rotatable. . On the left and right sides of the lower end of the seat back frame 21a, a substantially semicircular seat side gear 21c that is always meshed with the link side gear 13a of the both rear links 13 is formed.

  As will be described later, when the link side gear 13a rotates together with the connecting shaft 14 in the seating direction (clockwise in FIG. 4), the seat side gear 21c that meshes with the link side gear 13a rises around the connecting shaft 21b. It rotates in the counterclockwise direction in FIG. As a result, as shown in FIG. 4A, the seat body 20 moves to the seated state with the seat back 21 standing up with respect to the seat cushion 22. Further, when the link side gear 13a rotates together with the connecting shaft 14 in the storing direction (counterclockwise in FIG. 4), the seat side gear 21c meshing with the link side gear 13a is inclined forward about the connecting shaft 21b. It rotates in the clockwise direction in FIG. As a result, as shown in FIG. 4B, the seat main body 20 moves to the stored state with the seat back 21 tilted forward with respect to the seat cushion 22.

  As shown in FIGS. 4A, 4B, and 5, the reclining device 30 mainly includes a motor 31 having a reduction gear 31a, a sector gear 32, an intermediate gear 33, a spiral spring 34, and a rotation angle. A sensor 35, a rotation angle sensor 36, a lock mechanism 37, and a drive control device 40 are provided.

  The motor 31 functions as a driving unit for tilting the seat back 21 in a standing state or a forward tilting state with respect to the seat cushion 22 and also functions as a driving unit for translating the seat body 20 to a seated state or a stored state. To do. The motor 31 is driven and controlled by the drive control device 40, and rotates the pinion gear 31b, which is a rotating shaft, in a desired direction with a predetermined reduction ratio by the speed reducer 31a. The motor 31 is fixed to the outer surface of the left side plate 22b so that the pinion gear 31b protrudes inward through the left side plate 22b of the seat cushion frame 22a.

  The sector gear 32 is rotatably supported on the inner surface of the left side plate 22b of the seat cushion frame 22a, and is formed in a substantially semicircular shape so as to always mesh with the pinion gear 31b of the motor 31.

  The intermediate gear 33 is supported on the inner surface of the left side plate 22b of the seat cushion frame 22a so as to be coaxially and relatively rotatable with the sector gear 32 and always mesh with the link side gear 13a of one rear link 13. .

  The spiral spring 34 is formed of a spirally wound elastic body, and is arranged so that one end thereof engages with the side surface of the sector gear 32 and the other end engages with the side surface of the intermediate gear 33. .

  Thus, when the spiral spring 34 is elastically deformed in the rotation direction in accordance with the rotation of the sector gear 32, the intermediate gear 33 is rotated in the same rotation direction as the sector gear 32 by the urging force corresponding to the elastic deformation. That is, the spiral spring 34 is interposed between the seat back 21 and the pinion gear 31b of the motor 31, and causes the seat back 21 to be seat cushion 22 by elastic deformation according to the rotation of the pinion gear 31b for tilting the seat back 21. It functions as an urging member that urges to tilt. Further, the spiral spring 34 rotates the intermediate gear 33 by its urging force to rotate the link side gear 13a of the both rear links 13 around the connecting shaft 14, so that it corresponds to the rotation of the pinion gear 31b. It functions as an urging member that urges the seat body 20 to move parallel to the seating state or the storage state in a horizontal state by the links 12 and 13 by elastic deformation.

  The rotation angle sensor 35 is built in the motor 31, and outputs an angle signal corresponding to the rotation angle θm of the rotor of the motor 31 to the drive control device 40.

  The rotation angle sensor 36 is a potentiometer that detects a rotation angle in accordance with a change in resistance value, and is attached to the left side plate 22b of the seat cushion frame 22a on which the connecting shaft 14 is rotatably supported. Thereby, the rotation angle sensor 36 outputs an angle signal corresponding to the rotation angle of the connecting shaft 14 (hereinafter also referred to as the output-side rotation angle θs) detected from the change in resistance value to the drive control device 40. To do. The output side rotation angle θs corresponds to the tilt angle of the seat back 21 with respect to the seat cushion 22.

  The lock mechanism 37 is a mechanism for restricting the tilting of the seat back 21 and the parallel movement of the seat body 20 with respect to the seat cushion 22, and the relative rotation between the connecting shaft 21b and the seat cushion frame 22a according to the pulling-down operation of the operation lever 37a. By disabling the movement, a locked state in which the above restriction is implemented is established. Further, the lock mechanism 37 is brought into an unlocked state in which the restriction is released by enabling relative rotation between the connecting shaft 21b and the seat cushion frame 22a in accordance with a pulling operation of the operation lever 37a.

  As shown in FIG. 5, the drive control device 40 is electrically connected to the motor 31, the rotation angle sensor 35, and the rotation angle sensor 36, and the rotation angle θm from the rotation angle sensor 35 and the speed reduction of the speed reducer 31a. Based on the input side rotation angle θg obtained by multiplying the rotation angle of the pinion gear 31b obtained from the ratio by a predetermined coefficient and the output side rotation angle θs from the rotation angle sensor 36, a motor drive control process described later is performed. The motor 31 is driven and controlled. The predetermined coefficient is set so that the input side rotation angle θg and the output side rotation angle θs change by 1: 1 when the spiral spring 34 is not elastically deformed.

  Next, the motor drive control process will be described with reference to FIGS. 6 and 7 are flowcharts showing a drive control process of the motor 31 by the drive control device 40. FIG. FIG. 8 is a time chart showing the relationship between the input side rotation angle θg and the output side rotation angle θs and the relative angle difference Δθ during forward tilt rotation. FIG. 9 is a time chart showing the relationship between the input side rotation angle θg and the output side rotation angle θs and the relative angle difference Δθ during the upright rotation. In the following description, it is assumed that the seat body 20 is in the upright and seated state and the lock mechanism 37 is in the locked state, and the following processing is started.

First, the output-side rotation angle [theta] s, as shown in step S101 of FIG. 6 is determined whether greater than [theta] s _1. Here, θs ₁ is a rotation angle slightly changed in the forward rotation direction than the output-side rotation angle θs when the seat body 20 is in the standing state. At the present stage, the seat body 20 is in the standing state. it is determined as Yes at step S101 because the output-side rotation angle [theta] s is determined whether it is [theta] s ₁ or less in step S103. At this stage, since the lock mechanism 37 is in the locked state, the output side rotation angle θs becomes larger than θs ₁ , and therefore the determination of No is repeated in step S103. When the output side rotation angle θs is equal to or smaller than θs ₁ in step S101, the determination process in step S121 of FIG. 7 described later is performed.

  If the lock mechanism 37 is unlocked in response to the pulling operation of the operation lever 37a during the repeated determination of No in step S103, the connecting shaft 21b and the seat cushion frame 22a can be rotated relative to each other.

  Therefore, when the intermediate gear 33 is rotated by a predetermined angle in the forward tilt rotation direction by the urging force of the spiral spring 34 that has been elastically deformed in the forward tilt rotation direction as will be described later, the intermediate gear 33 meshes with the intermediate gear 33. The link side gear 13a of the rear link 13 rotates together with the connecting shaft 14 by a predetermined amount in the forward tilt rotation direction. Accordingly, the seat back 21 is tilted by a predetermined amount in the forward tilt direction with respect to the seat cushion 22, and the seat body 20 is translated by a predetermined amount in the storage direction by the links 12 and 13.

When the output-side rotation angle θs becomes equal to or smaller than θs ₁ due to the tilting of the seat back 21 according to the urging force of the spiral spring 34 as described above (Yes in S103), a forward tilt drive process is performed in step S105. By this processing, the motor 31 is automatically driven, and the pinion gear 31b rotates in the forward tilt rotation direction.

  When the sector gear 32 is rotated in the forward tilt rotation direction by the rotation of the pinion gear 31b, the spiral spring 34 is elastically deformed in the forward tilt rotation direction in accordance with the rotation of the sector gear 32. The spring 34 rotates in a state of being biased in the forward tilt rotation direction. As the link side gear 13a and the connecting shaft 14 are rotated in accordance with the rotation of the intermediate gear 33, the seat back 21 is tilted forward with respect to the seat cushion 22, and the seat body 20 is linked to each link 12. , 13 are translated in the storage direction.

  Next, in step S107, the input side rotation angle θg obtained by multiplying the rotation angle θm and the rotation angle of the pinion gear 31b obtained from the reduction ratio of the reduction gear 31a by the predetermined coefficient, the output side rotation angle θs, The relative angle difference Δθ, which is the difference between the two, is calculated.

Then, in step S109, the relative angle difference Δθ is determined whether it is ?? p ₁ or more. Here, Δθp ₁ is an angle threshold for determining whether or not pinching has occurred in the forward tilt rotation direction, and details will be described later.

Here, if no pinching has occurred and the relative angle difference Δθ is less than Δθp ₁ (No in S109), in step S111, whether the seat body 20 is tilted forward based on the output side rotation angle θs or the like. It is determined whether or not, and it is determined No until the sheet main body 20 is in the forward tilt state, and the processing from step S105 is repeated.

  When the seat body 20 is tilted forward (Yes in S111) and the lock mechanism 37 is locked in response to the operation of pulling down the operation lever 37a, the standing direction urging process is performed in step S113. In this process, in order to elastically deform the spiral spring 34 in the upright rotation direction in the locked state, the motor 31 is driven to rotate the pinion gear 31b by a predetermined angle in the upright rotation direction. Thereby, when the lock mechanism 37 is unlocked, the seat back 21 is tilted by a predetermined angle in the standing direction by the urging force of the spiral spring 34.

On the other hand, when the relative angle difference Δθ is equal to or greater than the angle threshold value Δθp ₁ in step S109 (Yes in S109), the reverse drive process in step S115 is performed, and the pinion gear 31b is in the reverse direction (stand-up) with respect to the immediately preceding rotation direction. The motor 31 is driven and controlled to rotate by a predetermined amount in the movement direction.

  The reason why the motor 31 is driven and controlled will be described with reference to the time chart of FIG. In the time chart of FIG. 8 and the time chart of FIG. 9 to be described later, the positive side indicates the standing rotation direction, and the negative side indicates the forward tilt rotation direction, and the input side rotation angle θg is output as the relative angle difference Δθ. When it changes in the standing rotation direction with respect to the side rotation angle θs, it increases to the positive side (when it changes to the forward tilt rotation direction, it increases to the negative side), and the output side rotation angle θs becomes larger than the input side rotation angle θg. When it changes in the standing rotation direction, it increases to the negative side (when it changes to the forward tilt rotation direction, it increases to the positive side).

When the locking mechanism 37 in the sheet main body 20 of the upright state is unlocked (see P ₁ in FIG. 8), the inclined front seat back 21 by a predetermined amount in tilt direction in accordance with the biasing force of the spiral spring 34 as described above The output side rotation angle θs changes in the forward tilt rotation direction. At this time, since the input side rotation angle θg is constant, the relative angle difference Δθ increases to the positive side.

When the output-side rotation angle [theta] s is anteversion driving process of the step S105 becomes [theta] s ₁ below is made (see P ₂ in FIG. 8), so as to elastically deform the spiral spring 34 before傾回moving direction The pinion gear 31b of the motor 31 rotates. While the spiral spring 34 finishes elastic deformation and rotates following the rotation of the pinion gear 31b, the difference in angle between the input-side rotation angle θg and the output-side rotation angle θs is constant. Δθ is constant.

During rotation of the such pre傾回moving direction, for example, the entrapment of foreign object such as between the seat back 21 and the seat cushion 22 is generated (see P ₃ in FIG. 8), the spiral spring 34 is further Since the degree of increase in the output side rotation angle θs becomes smaller than the degree of increase in the input side rotation angle θg due to elastic deformation, the relative angle difference Δθ increases to the negative side.

Therefore, the angle threshold value Δθp ₁ is set in advance according to the relative angle difference Δθ that can be determined to be caught during rotation in the forward tilt rotation direction, and the relative angle difference Δθ and the angle threshold value Δθp that increase as described above are set. by comparing ₁ and, when the relative angle difference Δθ is the angle threshold ?? p ₁ or the negative side (see _{P 4} in FIG. 8), pinching is detected (Yes in S109).

In response to the pinch detection, a predetermined amount by rotating (see P ₅ in FIG. 8 in the opposite direction (standing rotation direction) with respect to the rotational direction of the immediately preceding pinion gear 31b by the reverse driving process of the step S115 ), The pinching can be eliminated.

When standing direction biasing the processing of step S113 described above is performed, in step S121 of FIG. 7, the output-side rotation angle [theta] s is determined whether it is [theta] s ₂ or more. Here, θs ₂ is a rotation angle that is slightly changed in the standing rotation direction than the output-side rotation angle θs when the seat body 20 is tilted forward, and the lock mechanism when the seat body 20 is tilted forward. If it is locked by 37, the output side rotation angle θs is less than θs ₂ , so the determination of No is repeated in step S121.

  When the lock mechanism 37 enters the unlocked state in response to the pulling operation of the operation lever 37a, the intermediate gear 33 is moved in the upright rotation direction by the urging force of the spiral spring 34 that has been elastically deformed in the upright rotation direction in advance in step S113. The link side gear 13a of the rear link 13 that meshes with the intermediate gear 33 rotates together with the connecting shaft 14 in the upright rotation direction. As a result, the seat back 21 tilts by a predetermined amount in the standing direction with respect to the seat cushion 22, and the seat body 20 is translated by a predetermined amount in the seating direction by the links 12 and 13.

As described above, when the seat back 21 is tilted according to the urging force of the spiral spring 34 and the output side rotation angle θs becomes equal to or larger than θs ₂ (Yes in S121), the standing drive process is performed in Step S123. By this processing, the motor 31 is automatically driven, and the pinion gear 31b rotates in the upright rotation direction.

  When the sector gear 32 is rotated in the upright rotation direction by the rotation of the pinion gear 31b, the spiral spring 34 is elastically deformed in the upright rotation direction according to the rotation of the sector gear 32. It rotates in a state of being urged in the standing rotation direction. The link side gear 13a and the connecting shaft 14 are rotated according to the rotation of the intermediate gear 33, whereby the seat back 21 is tilted in the standing direction with respect to the seat cushion 22, and the seat body 20 is connected to each link 12, 13 is translated in the seating direction.

Next, when the relative angle difference Δθ is calculated at step S125, the in step S127, the relative angle difference Δθ is determined whether it is ?? p ₂ or more. Here, Δθp ₂ is an angle threshold value for determining whether or not pinching has occurred in the standing rotation direction, and details will be described later.

Here, if no pinching has occurred and the relative angle difference Δθ is less than Δθp ₂ (No in S127), whether or not the seat body 20 is in an upright state based on the output side rotation angle θs or the like in step S129. Is determined as No until the sheet main body 20 is in the standing state, and the processing from Step S123 is repeated.

  Then, when the seat body 20 is in a standing state (Yes in S129) and the lock mechanism 37 is in a locked state in response to the operation of pulling down the operation lever 37a, a forward tilt direction urging process is performed in step S131. In this process, in order to elastically deform the spiral spring 34 in the forward tilt rotation direction in the locked state, the motor 31 is driven to rotate the pinion gear 31b by a predetermined angle in the forward tilt rotation direction. Thus, when the lock mechanism 37 is unlocked, the seat back 21 is tilted by a predetermined angle in the forward tilt direction by the urging force of the spiral spring 34. Then, the process of step S103 in FIG. 6 is performed.

On the other hand, (Yes in S127) in step S127, the relative angle difference Δθ is the angle threshold ?? p ₂ or more, inversion processing is performed at step S133, backward (forward tilt pinion gear 31b is against the rotational direction of the immediately preceding The motor 31 is driven and controlled to rotate by a predetermined amount in the rotation direction.

The reason why the motor 31 is driven and controlled will be described with reference to the time chart of FIG.
When the locking mechanism 37 in the sheet main body 20 of the anteversion state is an unlocked state (see P ₁ in FIG. 9), the inclined seat back 21 is in the standing direction by a predetermined amount in accordance with the biasing force of the spiral spring 34 as described above The output side rotation angle θs changes in the upright rotation direction. At this time, since the input side rotation angle θg is constant, the relative angle difference Δθ increases to the negative side.

When the output-side rotation angle [theta] s is standing driving process of the step S125 becomes [theta] s ₂ or more is made (see P ₂ in FIG. 9), the motor 31 so as to elastically deform the spiral spring 34 in the standing rotational direction The pinion gear 31b rotates. While the spiral spring 34 finishes elastic deformation and rotates following the rotation of the pinion gear 31b, the difference in angle between the input-side rotation angle θg and the output-side rotation angle θs is constant. Δθ is constant.

During such standing rotation in the rotational direction, for example, (see P ₃ in FIG. 9) entrapment of foreign object or the like is generated between the seat back 21 and the seat cushion 22, the spiral spring 34 is further elastically Since the degree of increase in the output side rotation angle θs is reduced with respect to the degree of increase in the input side rotation angle θg, the relative angle difference Δθ increases to the positive side.

Therefore, erected angle threshold ?? p ₂ preset in accordance with the relative angle difference Δθ of rotation direction entrapment during rotation can be judged to have occurred, the relative angle difference Δθ which increases as described above and angle threshold ?? p ₂ preparative by comparing, when the relative angle difference Δθ in a positive side is the angle threshold ?? p ₂ or more (see _{P 4} in FIG. 9), pinching is detected (Yes in S127).

In response to the pinch detection, P ₅ in (in FIG. 9 by a predetermined amount rotating the pinion 31b by inversion driving process in the opposite direction to the rotational direction of the immediately preceding (previous傾回dynamic direction) in step S133 See), and pinching can be eliminated.

As described above, in the seat device 10 according to the present embodiment, the spiral spring 34 is interposed between the seat cushion 22 and the pinion gear 31b of the motor 31, and the spiral spring 34 is tilted forward of the pinion gear 31b. The seat back 21 is biased forwardly with respect to the seat cushion 22 by elastic deformation according to rotation in the movement direction, and the seat back 21 is seated by elastic deformation according to rotation in the upright rotation direction of the pinion gear 31b. The cushion 22 is urged in the standing direction. When the relative angle difference Δθ between the input side rotation angle θg and the output side rotation angle θs (the tilt angle of the seat back 21) becomes equal to or greater than the angle threshold value (Δθp ₁ , Δθp ₂ ), the drive control device 40 The motor 31 is driven so that 31b is rotated by a predetermined amount in the opposite direction to the previous rotation direction.

As described above, when the relative angle difference Δθ is equal to or greater than the angle threshold value (Δθp ₁ , Δθp ₂ ), it is possible to detect the pinching without providing a dedicated detection unit. In addition, since the relative angle difference Δθ corresponding to the elastic deformation of the spiral spring 34 is used, pinching can be reliably detected without being affected by power supply voltage fluctuations, actuator characteristics, and the like.

Further, in the seat device 10 according to the present embodiment, the links 12 and 13 that support the seat cushion 22 so as to move in parallel with the vehicle body B by elastic deformation of the spiral spring 34 according to the rotation of the pinion gear 31b. A link mechanism is provided. As a result, when a foreign object or the like is sandwiched between the links 12 and 13 during the operation of the link mechanism that uses the rotation of the motor 31 via the spiral spring 34, the relative angle difference Δθ described above becomes the angle threshold value (Δθp ₁ , Since Δθp ₂ ) or more, it is possible to detect pinching in the link mechanism.

FIG. 10 is a map showing the relationship between the angle threshold value Δθp and the output side rotation angle θs.
As a modification of the motor drive control process described above, the angle threshold values Δθp ₁ and Δθp ₂ may be set according to the output side rotation angle θs, that is, the tilt angle of the seat back 21.

Specifically, for example, as shown in FIG. 10, when the output side rotation angle θs is equal to or less than θs ₃ corresponding to the vicinity of the forward tilt state where the head or neck is likely to be pinched, the angle threshold value is set. Δθp is set to Δθp ₃ which is a relatively small value. In addition, when the output side rotation angle θs is equal to or larger than θs ₄ corresponding to the vicinity of the standing state, the angle threshold Δθp is set to a relatively large value Δθp ₄ . When the output side rotation angle θs is larger than θs _{3 and} smaller than θs ₄ , the angle threshold Δθp is set so as to increase linearly as the output side rotation angle θs increases.

  As a result, the angle threshold Δθp becomes small in the vicinity of the forward tilt state where the possibility of the head or neck being pinched is high, and pinching can be reliably detected even when the pinching load generated during pinching is relatively small. Note that the angle threshold Δθp may be set according to the output-side rotation angle θs in consideration of the pinching by the links 12 and 13.

In addition, this invention is not limited to the said embodiment, You may actualize as follows, and even in that case, an effect | action and effect equivalent to the said embodiment are acquired.
(1) The seat device 10 does not employ the above-described link mechanism, for example, a seat main body 20 having a seat cushion 22 supported on the floor surface and a seat back 21 supported tiltably on the seat cushion 22. The reclining device 30 may be used.

(2) The rotation angle of the pinion gear 31b is not limited to the rotation angle θm detected by the rotation angle sensor 35 incorporated in the motor 31 and the reduction ratio of the reduction gear 31a. For example, the pinion gear 31b You may provide the sensor which can measure the rotation angle of this directly. Further, a sensor capable of detecting the rotation angle of the sector gear 32 may be provided, and the input side rotation angle θg may be obtained based on the rotation angle output from the sensor.

(3) The output-side rotation angle θs is not limited to being detected as the rotation angle of the connecting shaft 14 by the rotation angle sensor 36, and for example, a sensor that can detect the tilt angle of the seat back 21 with respect to the seat cushion 22. And the output side rotation angle θs may be detected based on the tilt angle output from the sensor.

It is a side view which shows schematic structure of the sheet | seat apparatus which concerns on this embodiment. It is a perspective view which shows the frame structure of a seat apparatus from the left front. It is a perspective view which shows the frame structure of a seat apparatus from the front right. FIG. 4A is a side view showing the seat body standing and seated, and FIG. 4B is a side view showing the seat body tilted forward and stored. It is a block diagram which shows the electrical structure of a reclining apparatus. It is a part of flowchart which shows the drive control process of the motor by a drive control apparatus. It is a part of flowchart which shows the drive control process of the motor by a drive control apparatus. It is a time chart which shows the relationship between the input side rotation angle and output side rotation angle at the time of forward tilt rotation, and a relative angle difference. It is a time chart which shows the relationship between the input side rotation angle at the time of standing rotation, the output side rotation angle, and a relative angle difference. It is a map which shows the relationship between an angle threshold value and a rotation angle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Seat apparatus 12 ... Front side link (link mechanism)
13 ... Rear side link (link mechanism)
13a ... Link side gear 14 ... Connecting shaft 20 ... Seat body 21 ... Seat back 21c ... Seat side gear 22 ... Seat cushion 30 ... Reclining device 31 ... Motor 31b ... Pinion gear (rotary shaft)
32 ... Sector gear 33 ... Intermediate gear 34 ... Spiral spring (biasing member)
35 ... Rotation angle sensor (rotation angle detection means)
36... Rotation angle sensor (tilt angle detection means)
37 ... Lock mechanism 40 ... Drive control device (motor drive control means)
θg: Input side rotation angle (rotation angle)
θm: rotation angle (rotation angle)
θs: Output side rotation angle (tilt angle)
Δθ: relative angular difference Δθp, Δθp ₁ , Δθp ₂ , Δθp ₃ , Δθp ₄ ... angle threshold (predetermined threshold)

Claims (3)

A seat cushion supported by the floor,
A seat back that is tiltably attached to the seat cushion;
A motor for tilting or raising the seat back relative to the seat cushion;
It is interposed between the seat cushion and the rotating shaft of the motor, and the seat back is tilted forward with respect to the seat cushion by elastic deformation according to the rotation of the rotating shaft for tilting the seat back forward. An urging member that urges the seat back in an upright direction with respect to the seat cushion by elastic deformation according to rotation of the rotation shaft for raising the seat back.
Motor drive control means for driving and controlling the motor;
A tilt angle detecting means for detecting a tilt angle of the seat back with respect to the seat cushion;
Rotation angle detection means for detecting the rotation angle of the rotation shaft,
The motor drive control means rotates the rotation shaft of the motor by a predetermined amount in the reverse direction with respect to the immediately preceding rotation direction when a relative angle difference between the rotation angle and the tilt angle becomes a predetermined threshold value or more. Characteristic sheet device.   The seat device according to claim 1, further comprising a link mechanism that supports the seat cushion so as to move with respect to the floor surface by elastic deformation of the urging member according to rotation of the rotation shaft.   The sheet apparatus according to claim 1, wherein the predetermined threshold is set according to the tilt angle.

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