JP4252854B2 - Control device for motor retractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device for a motor retractor that is applied to a seat belt device for restraining an occupant seated on a seat of a vehicle or the like with a webbing and winds the webbing so that the webbing can be pulled out.
[0002]
[Prior art]
A vehicle such as a passenger car is provided with a seat belt device for restraining an occupant seated on the seat by a long belt-like webbing. Of these, a so-called three-point seat belt device is wound so that the webbing can be pulled out. A retractor (webbing take-up device) is provided for storing in a state of being stored.
[0003]
The retractor includes a winding shaft that winds the webbing from the base end side by locking and rotating the base end side in the longitudinal direction of the webbing, and a spiral spring that urges the winding shaft in the webbing winding direction. And an urging member. In the seat belt device provided with the retractor, when the occupant wears the webbing, the winding shaft is biased in the winding direction of the webbing by the biasing force of the biasing member, thereby removing the slack. The webbing restrains the occupant. When the occupant releases the webbing wearing state, the webbing is wound around the winding shaft by the biasing force of the biasing member.
[0004]
Here, when the urging force of the urging member is small, the webbing is not wound up to the end and is in a slack state, which causes a deterioration in appearance when the webbing is not used. On the other hand, when the urging force of the urging member is large, it causes a feeling of pressure to the occupant wearing the webbing.
[0005]
Therefore, the urging force of the urging member is reduced to reduce (suppress) the feeling of pressure applied to the occupant, and the take-up shaft is driven to compensate for the decrease in the webbing take-up force on the take-up shaft due to this urging force reduction. A motor retractor that includes a motor that performs the above-described problem is considered (for example, see Patent Document 1). In the control device of the motor retractor (seat belt device) described in Patent Document 1, when the buckle switch detects that the engagement between the buckle and the tongue plate is disengaged, that is, when the occupant releases the wearing state of the webbing In addition, the motor is operated for a certain period of time to drive the winding shaft in the webbing winding direction.
[0006]
Furthermore, in this motor retractor control device, when the occupant detection device detects that there is no occupant in the vehicle, when the door switch detects that the door is open, the engine key switch is disconnected. Alternatively, at any point in time when it is detected that it is in the OFF state, the motor is operated for a predetermined time and the webbing is taken up again. In other words, the motor retractor control apparatus is configured to rewind the webbing when the occupant gets off or is about to get off.
[0007]
As a result, even if the occupant who has released the webbing is holding the webbing in his / her hand and the webbing has not been sufficiently wound up for a certain period of time, the webbing can be reliably secured by rewinding. Can be stored (stored) in a retractor. Further, since the re-operation of the motor is limited to a predetermined time, it is possible to prevent the motor from being continuously loaded or from wasteful consumption of battery current.
[0008]
[Patent Document 1]
JP 2001-163186 A
[0009]
[Problems to be solved by the invention]
However, in the motor retractor control device described in Patent Document 1, since the motor control parameter is only time, the webbing is fully wound on the winding shaft before the lapse of the predetermined time or the predetermined time (full storage). Even when the predetermined time or predetermined time (in the case of rewinding) elapses, the current continues to be supplied to the motor. In particular, when the webbing is completely stored by the operation of the motor before rewinding, the rewinding operation (energy consumption) itself is completely wasted.
[0010]
The trigger information for rewinding the webbing by the motor is detected by the occupant detection device that the occupant is no longer in the vehicle, the door switch is detected by the door switch, or the engine key switch by the engine key switch is removed. Or since it is the detection of being in an OFF state, it cannot be reliably estimated that the occupant has got off or is about to get off. For this reason, the webbing is rewinded while the occupant is on board, that is, seated on the seat, and the webbing may not be reliably and sufficiently wound as in the first winding.
[0011]
In consideration of the above-described facts, the present invention provides a motor retractor control device capable of preventing unnecessary power feeding to a motor while maintaining a function of reliably winding a webbing on a winding shaft when not in use. Is the purpose.
[0016]
[Means for Solving the Problems]
Up Claims to achieve the purpose 1 The motor retractor control device according to the present invention includes a winding shaft that is mounted on an occupant seated on a seat and wound with a webbing for restraining the occupant, and a motor connected to the winding shaft. A control device for a motor retractor that rotates the winding shaft with the driving force of the motor and winds the webbing on the winding shaft when the webbing is not used, and detects whether the webbing is mounted Electrically connected to each of detection means, winding detection means for detecting the winding state of the webbing on the winding shaft, seating detection means for detecting seating of the occupant, and opening / closing detection means for detecting opening / closing of the door And feeding the motor so that the winding shaft winds up the webbing when the input signal from the mounting detection means is switched from a mounted signal to a mounted non-signal. Started, whole volume collected signal is inputted from the winding detecting means Zukatsu When a predetermined time has elapsed from the estimated getting off time when the input signal from the open / close detection means switches from an open signal to a close signal in a state where a seating non-signal is input from the seating detection means, power is supplied to the motor. It is characterized by stopping.
[0017]
Claim 1 In the motor retractor control device described above, when the signal input from the mounting detection means switches from the mounting presence signal to the mounting non-signal, that is, a signal corresponding to the release of the webbing mounting state by the occupant is input. Then, an electric current is supplied to the motor to rotate the winding shaft, and the webbing is wound around the winding shaft. When the entire winding signal is input from the winding detection means, that is, when the webbing is fully stored in the motor retractor, the power supply to the motor is stopped. Note that one of the non-mounting signal and the mounting presence signal may be a zero signal.
[0018]
In addition, when the entire winding signal is not input from the winding detection unit, the signal input from the open / close detection unit is switched from the open signal to the closed signal while the seating non-signal is input, that is, the occupant is sure. When the condition that is estimated to have got off is satisfied, the time when the condition is satisfied is set as the estimated time of getting off, and the power supply to the motor is stopped when a predetermined time has elapsed from the estimated time of getting off. Further, when the entire winding signal is input from the winding detection means until the predetermined time elapses from the estimated getting-off time, the power supply to the motor is stopped when the entire winding signal is input.
[0019]
Here, in the motor retractor control device, since the motor is basically supplied until the entire winding signal is input from the winding detection means, the webbing is reliably wound around the winding shaft. Further, since the power supply to the motor is stopped when the webbing is fully stored, unnecessary power supply after the entire storage is prevented. Furthermore, since the occupant's disembarkation is estimated by the seating absence signal of the seating detection means and the switching from the open signal to the close signal of the open / close detection means (under the two detection handing-off AND conditions), the detection accuracy of getting off is high. . Even when the webbing is not fully retracted before getting off, maintaining the motor operation after getting off the vehicle causes an artificial obstacle to the winding by the occupant at the time of winding the webbing (for example, the passenger before getting off the webbing The webbing operation can be performed in a state where there is no hand in hand and the webbing can be reliably wound around the winding shaft. In addition, since the power supply time after the passenger gets off is limited to a predetermined time, if the webbing is not fully stored due to physical obstruction factors (for example, the webbing is caught in the vehicle interior), unnecessary power supply to the motor may be continued. Is prevented.
[0020]
Thus, the claim 1 In the motor retractor control device described above, unnecessary power feeding to the motor can be prevented while maintaining the function of reliably winding the webbing around the winding shaft when not in use. The timing of starting power supply to the motor by the present control device is not limited to the moment (immediately after) of trigger information input when the signal input from the mounting detection means is switched from the mounted signal to the mounted non-signal. When a set time in which the webbing can be taken up by the biasing force after the input of information has elapsed, the winding speed by the biasing force has slowed (a corresponding signal is input from the winding detection means), etc. Also good.
[0021]
Claim 2 A control device for a motor retractor according to the invention described in claim 1 In the motor retractor control device described above, a current supplied to the motor before the predetermined time elapses from the estimated time of getting off is set larger than a current supplied to the motor from the start of power feeding to the estimated time of getting off. It is characterized by that.
[0022]
Claim 2 In the motor retractor control device described above, the supply current to the motor after the predetermined time elapses from when the getting off is estimated, that is, after the passenger gets off, is larger than the feeding current from the start of feeding to the estimated getting off time. Therefore, the driving force of the take-up shaft by the motor after the passenger gets off increases. For this reason, it becomes possible to reliably wind the webbing around the winding shaft against a physical obstacle to the winding at the time of winding the webbing.
[0023]
Claim 3 A control device for a motor retractor according to the invention described in claim 1 Or claims 2 In the motor retractor control device described above, after the power supply to the motor is stopped, the open signal in a state in which the entire winding signal is not input and the mounting non-signal and the seating non-signal are input. Is input, the power supply to the motor is started so that the winding shaft winds up the webbing.
[0024]
Claim 3 In the motor retractor control device described above, after the power supply to the motor is stopped, the door open signal is input in a state where the entire winding signal is not input and the mounting no signal and the seating no signal are input. When this is done, current is supplied to the motor to drive the winding shaft to rotate, so that the webbing is wound around the winding shaft. As a result, after a predetermined time has elapsed from the estimated time of getting off with the webbing not fully stored, the motor is stopped, and then the webbing rewinding is started with the door opening operation as a trigger.
[0025]
As a result, for example, when the winding operation is completed without being completely stored for some reason when getting off the previous time, the webbing is slackened by starting the winding of the webbing triggered by the opening operation of the door when getting on next time. Can be prevented from getting in the way.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. First, the motor retractor 10 that is a webbing retractor to which the motor retractor control device 80 according to the embodiment of the present invention is applied will be described, and then the control device 80 that performs power supply control to the motor retractor 10 will be described. And
[0027]
(Configuration of motor retractor)
FIG. 1 shows a schematic overall configuration of the motor retractor 10 in a partially cutaway front view. As shown in this figure, the motor retractor 10 includes a frame 12. The frame 12 includes a substantially plate-like back plate 14, and the motor retractor 10 is attached to the vehicle body by fixing the back plate 14 to the vehicle body by fastening means (not shown) such as bolts.
[0028]
The frame 12 includes a pair of leg plates 16 and 18 that extend from both ends of the back plate 14 in the width direction and face each other. Between these leg plates 16 and 18, a spool 20 as a take-up shaft manufactured by die casting or the like is disposed so as to be rotatable around an axis.
[0029]
The spool 20 includes a spool main body 22 formed in a substantially cylindrical shape, and a pair of flange portions 24 and 26 that are annularly extended radially outward from both axial end portions of the spool main body 22. Overall, it has a drum shape. In the spool 20, the flange portion 24 is positioned on the leg plate 16 side and the flange portion 26 is positioned on the leg plate 18 side in a state in which the axial direction thereof coincides with the opposing direction of the leg plates 16 and 18.
[0030]
A webbing 28 formed in a long band shape is wound around the spool body 22 of the spool 20 in a layered manner with its base end portion fixedly locked. As a result, when the spool 20 is rotated to one side around its axis, the webbing 28 is wound around the outer periphery of the spool body 22, and when the webbing 28 is pulled from its tip side, the webbing 28 pulls the spool 20 It is configured to be pulled out from the spool body 22 while rotating to the other side around the shaft center. In the following description, for convenience, the rotation direction on one side of the spool 20 around which the webbing 28 is wound is referred to as “winding direction”, and the rotation direction opposite to the winding direction is referred to as “drawing direction”. I will do it.
[0031]
Further, the spool 20 includes a support shaft portion 29 that protrudes coaxially from an end portion on the flange portion 24 side. The support shaft portion 29 passes through a circular hole 30 formed in the leg plate 16 substantially coaxially and protrudes to the outside of the frame 12. The support shaft portion 29 is fixed in a state where the open end is abutted against the outer surface of the leg plate 16. A cup-shaped case 32 is rotatably supported.
[0032]
A spiral spring (spring spring) 34 as an urging member is arranged inside the case 32. The spiral spring 34 has an outer end locked to the case 32 and an inner end locked to the support shaft portion 29 of the spool 20. When the spool 20 is rotated in the pulling direction from a neutral state (natural state) where no special load is applied, the spiral spring 34 generates a biasing force in the winding direction and biases the spool 20 in the winding direction. It is a configuration. Therefore, basically, when the tensile force applied to the webbing 28 to be pulled out from the spool 20 is released, the urging force of the spiral spring 34 rotates the spool 20 in the winding direction.
[0033]
The urging force of the spiral spring 34 (based on the winding force of the webbing 28) is set to be relatively weak so as to eliminate the slackness of the webbing 28 worn by the occupant. In other words, the urging force of the spiral spring 34 is set so as to have a strength corresponding to the occupant non-compressing property in the mounted state of the webbing 28, and the webbing 28 pulled out from the spool 20 resists the frictional force and the like. The strength to wind up is not required.
[0034]
Further, the spool 20 includes a support shaft portion (not shown) that projects coaxially from the end portion on the flange portion 26 side. This support shaft portion passes through a ratchet hole 36 of an internal tooth formed in the leg plate 18 substantially coaxially and protrudes to the outside of the frame 12, and is fixed in a state where the open end is abutted against the outer surface of the leg plate 18. Then, it is rotatably supported by a substantially cup-shaped case 40 constituting the lock mechanism 38.
[0035]
The lock mechanism 38 is accommodated in the case 40 in a state in which the support shaft portion is coaxially penetrated, and is disposed radially inside the ratchet gear 42 that can rotate relative to the spool 20 and the ratchet hole 36 of the frame 12. Basically, a lock base 44 that rotates integrally with the spool 20, a lock plate 46 that is supported by the lock base 44 so as to be able to advance and retreat from the outer periphery of the lock base 44 and can mesh with the internal teeth of the ratchet hole 36, and a case 40 The sensor ball 50 held on the inclined surface of the sensor frame 48 rolls and displaces upward so that the sensor arm 52 swings and the engagement teeth 54 mesh with the ratchet gear 42. 56 as main components.
[0036]
The lock mechanism 38 prevents the rotation of the ratchet gear 42 in the pull-out direction by the sensor ball 50 swinging the sensor arm 52 and the engaging teeth 54 meshing with the ratchet gear 42 by acceleration such as sudden deceleration of the vehicle. Then, the ratchet gear 42 is engaged with the inner teeth of the ratchet hole 36 by causing the lock plate 46 to protrude from the outer peripheral portion of the lock base 44 by relative rotation with the spool 20 that rotates in the pull-out direction by the tension of the webbing 28, The spool 20 is prevented from rotating in the pull-out direction.
[0037]
The motor retractor 10 includes a motor 60. The motor 60 is disposed below the spool 20 between the pair of leg plates 16 and 18 of the frame 12, and is fixedly held to the frame 12 (not shown). A gear 64 is coaxially and integrally provided on the output shaft 62 of the motor 60.
[0038]
A gear 66 having a diameter larger than that of the gear 64 is disposed above the gear 64. The gear 66 meshes with the gear 64 in a state in which the gear 66 is rotatably supported about an axis parallel to the spool 20 by the support plate 68 and the leg plate 16 provided between the leg plates 16 and 18. Further, on the side of the gear 66, a gear 70 having a smaller diameter than the gear 66 is provided coaxially and integrally with the gear 66.
[0039]
Further, a clutch 72 is provided above the gear 70. The clutch 72 includes an external gear 74 formed in a ring shape. The gear 74 is provided between the leg plate 16 and the flange portion 24 so as to be coaxial and relatively rotatable with respect to the spool 20, and both axial ends thereof are closed by disk-like members (not shown).
[0040]
The clutch 72 includes an adapter 76 that is a spool side member. The adapter 76 is provided coaxially and integrally between the flange portion 24 and the support shaft portion 29 of the spool 20 and allows the gear 74 to rotate by penetrating through the disk-like member of the gear 74 so as to be slidable. It is pivotally supported.
[0041]
A coupling member (not shown) is accommodated inside the gear 74, and the clutch 72 can transmit the rotation of the gear 74 and the adapter 76 by the rotation of the gear 74 in the winding direction (forward rotation of the motor 60). It is supposed to be combined with. On the other hand, the clutch 72 is released from mechanical coupling by the connecting member by a predetermined amount of rotation in the pull-out direction of the gear 74 (reverse rotation of the motor 60), and returns to a state where the spool 20 and the motor 60 are disconnected. It is. In other words, the clutch 72 is configured to maintain the coupling state by the connecting member as long as the motor 60 is not reversed.
[0042]
(Configuration of control device)
In the motor retractor 10 described above, power supply to the motor 60 is controlled by the control device 80. The control device 80 includes a driver 82 and an ECU 86. As shown in FIG. 1, the motor 60 of the motor retractor 10 is electrically connected to a battery 84 mounted on the vehicle via a driver 82, and current from the battery 84 is supplied via the driver 82. It is like that. The ECU 86 controls the presence / absence of power supply to the motor 60 via the driver 82 and the direction and magnitude of the supply current.
[0043]
The ECU 86 includes a driver 82, a rotation angle sensor 88 serving as a winding detection unit that outputs a signal corresponding to the winding amount of the webbing 28 to the spool 20, and a mounting detection unit that outputs a signal corresponding to whether the occupant is wearing the webbing 28. As a buckle switch 92, a door opening / closing sensor 94 as an opening / closing detection means for outputting a signal according to the opening / closing state of the vehicle door, and a seating detection means for outputting a signal according to the presence / absence of a passenger seated in the vehicle seat Are respectively electrically connected to a seating sensor 96.
[0044]
The rotation angle sensor 88 is disposed in the vicinity of the flange portion 26 of the spool 20, and outputs a magnetic change generated by the magnet 90 attached to the flange portion 26 following the rotation of the spool 20 as an electrical signal (change). It is supposed to be. That is, the rotation angle sensor 88 is configured to output a signal corresponding to the rotation amount of the spool 20 that is a physical amount corresponding to the winding amount of the webbing 28 to the spool 20 to the ECU 86. A signal input from the rotation angle sensor 88 to the ECU 86 is referred to as a “winding amount signal”, and a “total storing signal” in which the winding amount signal when the webbing 28 is fully stored in the motor retractor 10 is the entire winding signal. That is to say.
[0045]
The buckle switch 92 outputs an ON signal to the ECU 86 when the tongue plate provided on the webbing 28 is connected to the buckle device (both not shown), and the connection state of the tongue plate to the buckle device is released. An OFF signal is output to the ECU 86 when the vehicle is on. That is, the buckle switch 92 is configured to output either the ON signal or the OFF signal to the ECU 86 in accordance with whether or not the tongue plate and the buckle device corresponding to whether or not the webbing 28 is attached by the occupant.
[0046]
The door open / close sensor 94 is configured to output a close signal to the ECU 86 when the door corresponding to the seat provided with the motor retractor 10 is closed, and to output an open signal to the ECU 86 when the door is open. That is, the door open / close sensor 94 is configured to output either the close signal or the open signal to the ECU 86 in accordance with the open / closed state of the door.
[0047]
The seating sensor 96 outputs a seating presence signal to the ECU 86 when the occupant is seated on the seat on which the motor retractor 10 is provided, and outputs a seating non-signal to the ECU 86 when the occupant is not seated on the seat. It is a configuration. That is, the seating sensor 96 is configured to output either a seating presence signal or a seating absence signal to the ECU 86 in accordance with whether or not an occupant is seated on the seat.
[0048]
As the buckle switch 92, for example, a known sensor such as a contact switch, a non-contact switch such as an optical type or a magnetic type can be used. As the door opening / closing sensor 94, a well-known sensor such as a contact switch may be used as appropriate. Further, as the seating sensor 96, a known sensor such as a load sensor embedded in the seat portion of the seat (to output a signal corresponding to the load) or an infrared sensor (to output an ON / OFF signal) is used. be able to. For example, the buckle switch 92 and the seating sensor 96 may be shared with a use for determining whether or not the airbag device is operable, and the door opening / closing sensor 94 is used for issuing an alarm when the vehicle is running with the door open. It may be shared.
[0049]
The ECU 86 (control device 80) electrically connected to the various sensors and switches described above performs power supply control to the motor 60 of the motor retractor 10 based on signals input from these sensors and switches. Will be described together with the operation of the present embodiment. In addition, when a collision prediction signal is input from a collision prediction unit provided in the vehicle, the ECU 86 winds the webbing 28 before the collision occurs, winds the webbing 28, and restrains the occupant at the initial stage of the collision. It is designed to improve performance. Further, when a collision avoidance signal is input from the collision predicting means, the ECU 86 reverses the motor 60 to release the clutch 72.
[0050]
Next, the operation of the present embodiment will be described with reference to the flowchart of FIG.
[0051]
In the motor retractor 10 to which the control device 80 having the above configuration is applied, when the occupant is seated on the seat and the webbing 28 is mounted, the webbing 28 is weakly restrained by the urging force of the spiral spring 34. In this state, the ECU 86 receives an ON signal from the buckle switch 92, a close signal from the door opening / closing sensor 94, and a seating presence signal from the seating sensor 96. In addition, the ECU 86 receives a winding amount signal (not a full storage signal) corresponding to the occupant's physique and seat position from the rotation angle sensor 88.
[0052]
The ECU 86 determines in step 100 whether or not the input signal from the buckle switch 92 is an OFF signal, and repeats the step 100 while the ON signal is input. Then, when the occupant stops the vehicle, removes the tongue plate from the buckle device, and the input signal from the buckle switch 92 switches from the ON signal to the OFF signal, that is, the occupant releases the wearing state of the webbing 28. When the corresponding signal is input, the process proceeds to step 102.
[0053]
In step 102, a control signal for starting power supply to the motor 60 is output to the driver 82, and the process proceeds to step 104. The driver 82 to which this control signal is inputted supplies the current i1 to the motor 60 so that the motor 60 rotates in the forward direction and rotationally drives the spool 20 in the winding direction. Then, the rotation of the motor 60 is transmitted to the gear 74, and when the gear 74 rotates in the winding direction, the clutch 72 is coupled, the spool 20 rotates in the winding direction, and winding of the webbing 28 is started. In accordance with the rotation of the spool 20, the winding amount signal input from the rotation angle sensor 88 to the ECU 86 changes in the increasing direction of the winding amount.
[0054]
In step 104, it is determined whether or not a full storage signal has been input, that is, whether or not the winding amount signal has reached a value corresponding to the full storage state of the webbing 28. When the full storage signal is input, that is, when the spool 20 has rotated by an amount sufficient to wind up all the webbings 28 to be wound around the spool 20, the routine proceeds to step 106, where the power supply to the motor 60 is performed. Is stopped.
[0055]
On the other hand, if all the stored signals are not input, the process proceeds from step 104 to step 108. In step 108, it is determined whether or not a seating absence signal is input from the seating sensor 96. If no seating no signal is input, the process returns to step 104. If no seating no signal is input, the process proceeds to step 110.
[0056]
In step 110, whether or not a new closing signal is input from the door opening / closing sensor 94, that is, after the input signal from the door opening / closing sensor 94 changes from the closing signal at the time of traveling to the opening signal, the signal is switched again to the closing signal. It is determined whether or not. If the closed signal input state is maintained without the open signal input, and if the open signal input state is maintained, the process returns to step 104. On the other hand, if the closed signal is switched to the open signal, the process proceeds to step 112.
[0057]
In steps 108 and 110 described above, it is determined whether or not the door that has been opened in the state where the seating sensor 96 detects the non-seating of the occupant is closed. The process proceeds to step 112 as described above. In step 112, measurement of time T is started, and the process proceeds to step 114. The measurement start time of the time T is set as an “alighting estimated time” that coincides with the affirmative determination time in step 110.
[0058]
In step 114, a control signal for increasing the current supplied to the motor 60 to i 2 larger than i 1 is output to the driver 82, and the process proceeds to step 116. As a result, the motor 60 enters a high load (high load) operation mode, and the winding force or winding speed for winding the webbing 28 increases.
[0059]
In step 116, it is determined whether or not the elapsed time T from the estimated getting-off time has reached a predetermined time Ts. If the elapsed time T has reached the predetermined time Ts, the process proceeds to step 106, and the power supply to the motor 60 is stopped. If the elapsed time T has not reached the predetermined time Ts, the process proceeds to step 118. The predetermined time Ts is set in advance as a time sufficient to fully store the webbing 28 from the fully pulled out state.
[0060]
In step 118, it is determined whether or not all stored signals have been input. When all the storage signals are input, the process proceeds to step 106 and the power supply to the motor 60 is stopped. On the other hand, if all the stored signals are not input, the process returns to step 116. In other words, the power supply to the motor 60 is stopped when the predetermined time Ts has elapsed from the estimated time of getting off or the webbing 28 is fully stored in steps 116 and 118.
[0061]
The motor 60 whose power supply has been stopped stops its operation. At this time, the clutch 72 maintains the coupling state of the adapter 76 (spool 20) and the gear 74 (motor 60), and there is a concern about using the spiral spring 34 having a small urging force. The spool 20 is prevented from rotating in the pull-out direction due to its own weight or the like, that is, when the webbing 28 is not used.
[0062]
Although the flow is not shown, the process proceeds from step 116 to step 106 when the passenger gets off (when the webbing 28 is released), and the power supply to the motor 60 is stopped without the webbing 28 being fully stored. When the door corresponding to the seat provided with the motor retractor 10 is opened and an open signal is input to the ECU 86, the ECU 86 starts power supply to the motor 60 so that the motor 60 rotates forward. A signal is output to the driver 82. That is, when the winding of the webbing 28 is incomplete, the winding is started again with the door opening as a trigger. The conditions for stopping the power supply are the same as those in steps 104 to 118.
[0063]
On the other hand, the ECU 86 prepares to install the webbing 28 by the occupant based on input signals from the door opening / closing sensor 94 and the seating sensor 96 after the webbing 28 is fully stored or after the power supply for the rewinding is stopped. When the state is estimated, a control signal for starting power supply to the motor 60 is output to the driver 82 so that the motor 60 reverses. Then, the motor 60 rotates in reverse to release the clutch 72. As a result, the spool 20 is disconnected from the motor 60, and the webbing 28 can be pulled out with an appropriate pulling force by the occupant. The mounting preparation state may be, for example, a state where the door is opened and closed twice after step 100 and the seating presence signal is actually input.
[0064]
Here, in the control device 80 of the motor retractor 10, the winding amount signal of the rotation angle sensor 88 is input. When the entire storage signal is input, the power supply to the motor 60 is stopped. The wasteful power supply to the motor 60 later is prevented.
[0065]
In addition, the control device 80 estimates the occupant's dismounting (under the AND condition of the two sensor outputs) by switching the seating sensor 96 from the non-sitting signal and the opening / closing signal of the door opening / closing sensor 94 to the closing signal. High detection accuracy. Even when the webbing 28 is not fully retracted before getting off, maintaining the operation of the motor 60 after getting off (estimating), an artificial obstacle to the winding by the occupant when winding the webbing 28 (for example, Since the winding operation is performed in a state where the passenger before getting off does not have the webbing 28 in his / her hand, the webbing 28 can be reliably wound around the spool 20. Further, since the power feeding time after the passenger gets off is limited to the predetermined time Ts, the predetermined time is set when the webbing 28 is not fully stored due to a physical obstruction factor (for example, the webbing 28 or the tongue plate is caught in the vehicle). The useless power supply to the motor 60 is prevented from exceeding. This prevents battery consumption.
[0066]
Thus, in the control device 80 of the motor retractor 10 according to the present embodiment, it is possible to prevent unnecessary power supply to the motor 60 while maintaining the function of reliably winding the webbing 28 around the spool 20 when not in use. it can. For this reason, it is realized that the spiral spring 34 having a weak urging force is employed to prevent the occupant from being pressed and the wearing feeling of the webbing 28 is improved.
[0067]
Further, in the control device 80 of the motor retractor 10, the current i2 supplied to the motor 60 until the elapsed time T from the estimated getting-off time reaches a predetermined time Ts, that is, after the passenger gets off, gets off from the start of power supply (step 102). Since the current i1 supplied before the estimated time (step 112) is larger (i2> i1), the driving force of the spool 20 by the motor 60 after the passenger gets off increases. For this reason, there is a high probability that the webbing 28 is wound up to the fully retracted state by the spool 20 against a physical obstacle to the winding when the webbing 28 is wound up.
[0068]
Further, in the control device 80 of the motor retractor 10, when the power supply to the motor 60 is stopped in a state where the webbing 28 is not fully stored, the power supply to the motor 60 is started again with the input of the open signal as a trigger. Is more likely to be stored. As a result, for example, when the winding operation ends without being completely stored for some reason when getting off the previous time, the winding of the webbing 28 is started by using the door opening operation as a trigger when the next boarding is performed. It is possible to prevent the webbing 28 from interfering with the boarding.
[0069]
In the above-described embodiment, the configuration (control method) returns to step 104 when no seating non-signal is input at step 108 or when the signal does not switch to the closing signal at step 110. For example, a determination step for a predetermined time is added before returning to step 104, and the process returns to step 104 when the additional predetermined time has not elapsed, and proceeds to step 106 when the additional predetermined time has elapsed. You may make it. Thereby, for example, even when the passenger gets out of a door that does not correspond to the seat on which the occupant was seated, it is possible to prevent unnecessary power feeding beyond a predetermined time.
[0070]
Needless to say, the power supply control (particularly the order of each determination step) by the ECU of the control device 80 is not limited to the flowchart of FIG. Furthermore, in the above-described embodiment, a preferable configuration is described in which the supply current is increased in step 114. However, the present invention is not limited to this, and step 114 may not be provided.
[0071]
Furthermore, in the above embodiment, the power supply to the motor 60 is started when the input signal from the buckle switch 92 is switched from the ON signal to the OFF signal. However, the present invention is not limited to this, For example, in addition to switching from the ON signal to the OFF signal, it may be configured to have trigger information for starting power supply to the motor 60. Therefore, for example, immediately after switching from the ON signal to the OFF signal, the webbing 28 is wound by the urging force of the spiral spring 34, and after a predetermined time has elapsed from when the ON signal is switched to the OFF signal, or the spiral The power supply to the motor 60 can be started when the winding speed of the webbing 28 due to the biasing force of the spring 34 is slow (and determined based on the change in the output of the winding detection means 88). It is.
[0072]
Furthermore, in the above embodiment, when the power supply to the motor 60 is stopped in a state where the webbing 28 is not fully stored, the power supply to the motor 60 is started again with the input of the open signal as a trigger. The present invention is not limited to performing such control.
[0073]
In the above-described embodiment, the rotation angle sensor 88 that outputs a signal corresponding to the rotation amount of the spool 20 is provided as a winding detection unit. However, the present invention is not limited to this, and for example, The winding detection means may directly detect the pull-out amount of the webbing 28, or may detect the rotation amount of the spool 20 by a method other than the magnetic type. It may be a proximity switch, a contact switch, or the like that outputs an ON / OFF signal depending on whether or not it is located at a position corresponding to. That is, the winding detection unit does not need to constitute the motor retractor 10 as with the buckle switch 92, the door opening / closing sensor 94, and the seating sensor 96.
[0074]
Further, the present invention is not limited to the preferred configuration using the outputs of the door opening / closing sensor 94 and the seating sensor 96 as control parameters other than the outputs of the buckle switch 92 and the winding detection means 88. For example, the present invention includes steps 108 to 118. Alternatively, a step of stopping power supply to the motor 60 when the change rate of the winding amount signal becomes smaller than a set value when all the stored signals are not input may be provided.
[0075]
【The invention's effect】
As described above, the motor retractor control device according to the present invention is excellent in that unnecessary power feeding to the motor can be prevented while maintaining the function of reliably winding the webbing around the winding shaft when not in use. Has an effect.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a motor retractor control device according to an embodiment of the present invention, and a partially cutaway front view showing a schematic overall configuration of a motor retractor to which the control device is applied.
FIG. 2 is a flowchart illustrating an operation during webbing storage by the motor retractor control device according to the embodiment of the present invention.
[Explanation of symbols]
10 Motor retractor
20 Spool (winding shaft)
28 Webbing
60 motor
82 Driver (Motor retractor control device)
86 ECU (control device for motor retractor)
88 Rotation angle sensor (winding detection means)
90 Magnet (winding detection means)
92 Buckle switch (mounting detection means)
94 Door open / close sensor (open / close detection means)
96 Seating sensor (sitting detection means)

Claims (3)

A winding shaft on which a webbing that is mounted on an occupant seated on the seat and restrains the occupant is wound, and a motor connected to the winding shaft, and the motor is driven when the webbing is not used A control device for a motor retractor that rotates the winding shaft with force and winds the webbing around the winding shaft;
Mounting detection means for detecting whether or not the webbing is mounted, winding detection means for detecting the winding state of the webbing on the winding shaft, seating detection means for detecting the seating of the occupant, and detection of door opening / closing Electrically connected to the open / close detection means,
Triggered by the input signal from the mounting detection means switching from a mounting presence signal to a mounting non-signal, the power supply to the motor is started so that the winding shaft winds the webbing,
Alighting estimation input signals from the opening detecting means in a state where whole volume collected signal before Kimaki preparative detecting means seated no signal from and the seating detection means is not input is input is switched from the open signal to the close signal When a predetermined time has elapsed from the time point , the power supply to the motor is stopped.
A control device for a motor retractor. Claim 1, wherein the alighting estimated current supplied to said motor until said predetermined time from the time elapses, and larger than the current supplied to the motor until getting off the estimated time from the start of power supply, characterized in that The motor retractor control device described. After the supply of power to the motor is stopped, when the open signal is input in a state where the full winding signal is not input and the mounting no signal and the seating no signal are input, the winding 3. The motor retractor control device according to claim 1 , wherein power supply to the motor is started so that the take-up shaft winds the webbing . 4.

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