JP2000326773A - Driving device for swivel seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly judge the overload condition regardless of the weight of an occupant and the variation in the mounting accuracy of each component. SOLUTION: A control means 50 controls a driving means 51 and rotates a motor 42 for driving a rotary seat when a getting-on switch or a getting-off switch is operated. When the seat reaches a getting on and off position or a getting-on position, and a getting on and off position detector or a getting-on position detector is operated, the motor 42 is stopped. The control means 50 compares a period and the like of a pulse signal generated from a detecting means 52 with that of a pulse signal generated in the past, and judges the over-load condition when the pulse signal is changed, and the motor 42 is stopped or reversed. The control means 50 compares a width or the period of the pulse signal with a predetermined value to judge the over-load condition when a rotating speed of the motor 42 is controlled to a predetermined speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a rotary seat for a vehicle.

[0002]

2. Description of the Related Art In order to enable passengers, such as the elderly and the physically handicapped, to get on and off a vehicle easily, there has been developed a rotating seat for a vehicle which is configured to be capable of rotating in a horizontal direction. In such a vehicular rotatable seat that can be rotated in the horizontal direction, if the seat is manually rotated, the load on the occupant or assistant is large. Therefore, a drive device for a vehicular rotary seat that rotates a seat by a motor has been developed. In this vehicle rotating seat drive device, when the get-off switch or the getting-on switch is operated, the motor is driven, and the seat is turned on and off by a predetermined angle toward the front of the board in the vehicle traveling direction and the door. And rotational movement between them. Thereby, the occupant can easily get on and off the vehicle. Note that if the seat is rotated while the seat is slid back and forth in the vehicle traveling direction, the end of the seat or the occupant may come into contact with the vehicle equipment or the occupant may have difficulty getting on and off. For this reason, when rotating the seat, an operation of sliding the seat to a predetermined position may be required. Regarding the sliding movement operation of the seat, there are a method of performing the operation manually and a method of performing the operation by driving a motor. By the way, in such a driving device for a rotating seat for a vehicle, in order to stop or reverse the rotation of the seat when the end of the seat or the occupant comes into contact with the vehicle equipment during the rotational movement of the seat, as shown in FIG. The overload state is determined by detecting that the current value of the motor has exceeded the set value Iref.

[0003]

In a conventional driving apparatus for a rotary seat for a vehicle, an overload state is determined by comparing a current value of a motor with a set value Iref. If the current value of the motor at the normal time fluctuates due to mounting accuracy or the like, it may not be possible to accurately determine the overload state. For example, in the case of an occupant with a heavy weight, the difference between the current value of the motor and the set value in a normal state is small, so that there is a possibility that an erroneous determination is made that the vehicle is in an overload state even though it is not in an overload state. . On the other hand, in the case of an occupant with a light weight, the difference between the motor current value at normal time and the set value becomes large, so that even if the motor is overloaded, the motor current value does not exceed the set value. There is a possibility that it is not determined that the load state exists. In addition, the current value of the motor during normal operation also fluctuates depending on the accuracy of assembling the turntable or the like that supports the seat, so that the overload state cannot be similarly accurately determined. As a means for solving this problem, a method of setting a set value for each occupant can be considered. However, this method is complicated because a set value must be set for each occupant. Also, the setting operation of the set value is not easy. The present invention has been made in order to solve such a problem, and a vehicle capable of accurately determining an overload state regardless of a weight of an occupant, a variation in assembling accuracy of each component, and the like. It is an object of the present invention to provide a driving device for a rotary seat for use.

[0004]

According to a first aspect of the present invention, there is provided a driving apparatus for a rotating seat for a vehicle as described in claim 1. In the driving device for a rotating seat for a vehicle according to the first aspect, based on a change in a pulse generated according to the rotation of a motor that rotates the seat between a boarding rotation position and a boarding / alighting rotation position via a turntable. Determine the overload condition. For this reason, the overload state can be reliably determined irrespective of the occupant's weight or the variation in the assembling accuracy of each component. Further, the second invention of the present invention
A driving device for a vehicular rotary seat as described in claim 2. In the driving device for a rotating seat for a vehicle according to the second aspect, an overload state is set based on a comparison result between a pulse cycle of a pulse and an average value of pulse cycles of a plurality of pulses generated before the pulse. Determine. Therefore, the overload state can be more reliably determined. According to a third aspect of the present invention, there is provided a driving device for a rotary seat for a vehicle as described in claim 3. In the drive device for a vehicle rotary seat according to claim 3, the motor is driven in accordance with a deviation between a rotation speed of the motor that rotates the seat between the boarding rotation position and the getting-in / out rotation position via the turntable, and a set speed. While controlling, the overload state is determined based on the width of the pulse generated according to the rotation of the motor. For this reason, the overload state can be reliably determined irrespective of the occupant's weight or the variation in the assembling accuracy of each component. Further, the rotation time of the seat can be made substantially constant irrespective of the presence or absence of an occupant and the inclination of the vehicle, and a sudden decrease in rotation of the vehicle in a downward inclination state can be prevented. In addition, since the motor speed is controlled to be constant, it is easy to determine the overload state based on the pulse width. Further, it is easy to change the rotation speed of the seat. Further, the fourth invention of the present invention
A driving device for a vehicular rotary seat as described in claim 4. According to a fourth aspect of the present invention, the rotation speed of the motor is obtained based on a cycle of a pulse generated according to the rotation of the motor. For this reason, the pulse generating means for determining the overload state and the pulse generating means for detecting the rotational speed can be shared, and the circuit configuration is simplified.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. First, an example of a configuration of a rotating seat for a vehicle (hereinafter, simply referred to as “rotating seat”) will be described with reference to FIGS. 1 to 5. The rotating seat is configured to rotate the seat in a horizontal direction by a motor and to slide the seat forward and backward in the vehicle traveling direction. Also, a rotating seat applied to a passenger seat on the left side of the driver's seat is shown. Therefore, as shown in FIG. 1, a door opening D is provided on the left side of the rotating seat 1. Then, the rotating seat 1 slides toward the front of the vehicle from the rotation position (riding rotation position) facing the front side in the vehicle traveling direction (from bottom to top in FIG. 1) to approximately 90 degrees to the left (counterclockwise). , And is rotated to a rotation position (a boarding / alighting rotation position) facing the door opening D side.

The rotating seat 1 includes a seat body 2, a rotating support 10 for rotatably supporting the seat body 2, and a longitudinal support for supporting the seat body 2 and the rotating support 10 so as to be slidable in the vehicle longitudinal direction. A table 30 is provided. The details of the seat body 2 are shown in FIG. 2, and the details of the rotary support 10 and the front-back support 30 are shown in FIG. In each of the drawings, the front of the vehicle is indicated by an arrow “front”, and the door opening D side is indicated by an arrow “outside”. As shown in FIG.
Has a seat cushion 2a and a seat back 2b. At the front of the seat cushion 2a, a footrest 2c on which an occupant places his / her foot is mounted.

The rotary support 10 has a substantially rectangular base 12 which is long in the longitudinal direction of the vehicle, for example. Base 1
Two moving-side holding members 11 are attached to the left and right sides of 2. The turntable 13 is provided on the base 12. The turntable 13 includes an outer ring 13a and an inner ring 13b. The outer ring 13a and the inner ring 13b are configured to be relatively rotatable by a number of steel balls (not shown) provided between them. In the rotating seat shown in FIG. 3, the inner race 13b is fixed to the base 12, and a seat base (not shown) is fixed to the outer race 13a. The seat body 2 is placed on the seat base. Thereby, the seat main body 2 is rotatable in the horizontal direction with respect to the rotation support base 10 together with the seat base. Although not shown, the seat body 2 is attached to the seat base via a swing swing type elevating device. Thus, at the position where the seat body 2 is moved to the getting on / off rotation position, the elevating device is configured to be able to ascend and descend in a substantially arc shape between the room and the outside when viewed from the front of the vehicle.

The front-rear support 30 has a base 31 formed of, for example, a substantially rectangular plate that is long in the front-rear direction. The base 31 is fixed horizontally on the floor of the vehicle. On the upper surface of both ends of the base 31 in the vehicle width direction, two fixed left and right long sides in the front-rear direction for guiding the movable holding member 11 of the rotation support base 10 so as to be slidable back and forth in the vehicle traveling direction. The holding members 32 are provided in parallel. The fixed side holding member 32 and the moving side holding member 11
They are arranged so that one side faces each other. As shown in FIG. 4, V-shaped grooves 32 a and 11 a extending in the longitudinal direction (front-rear direction) are formed on the opposing surfaces of the fixed-side holding member 32 and the moving-side holding member 11, respectively. Further, a large number of steel balls 33 are provided so as to fit into both V-shaped grooves 32a and 11a. As a result, the linear guide mechanism 34 is configured, and the rotation support base 10 and thus the seat body 2 can slide in the vehicle front-rear direction.

Next, a rotary slide interlocking mechanism 20 for mechanically interlocking the rotational movement and the slide movement of the seat body 2 will be described with reference to FIGS. The rotation slide interlocking mechanism 20 includes a rack 21, an intermediate gear 22, a pinion gear 2,
4. The rack 21 is attached to a side surface of the fixed holding member 32. The intermediate gear 22 is
The rack 2 is rotatably mounted on the upper surface of the base 12.
1 is engaged. The intermediate gear 22 and the rack 21
The position and length of the rack 21 are set so that the meshing with the rack 21 is maintained in the entire range of movement of the seat body 2 in the front-rear direction.

On the other hand, the pinion gear 24 is attached to the lower surface of a seat base that supports the seat body 2. The pinion gear 24 is substantially 90 degrees centered on the rotation center of the seat base.
5 is formed in an arc shape, and a certain angle range (about 2 in FIG. 5) on the initial side of engagement (the end side in the counterclockwise direction).
At 6 degrees), no meshing teeth are formed. For this reason,
Approximately 26 at the beginning when the seat body 2 is started to rotate from the boarding rotation position facing the front of the vehicle (the position shown by the solid line in FIG. 5) to the boarding / alighting rotation position facing the door opening D side (counterclockwise direction). In the range of degrees, the pinion gear 24 and the intermediate gear 22 do not mesh. Therefore, in the initial range of about 26 degrees,
The seat body 2 only rotates and does not slide forward of the vehicle (non-interlocking range). When the seat body 2 further rotates in the direction of the getting on / off rotation position, the pinion gear 24 and the intermediate gear 22 mesh with each other, so that the intermediate gear 22 rotates in conjunction with the rotation operation of the seat body 2. The intermediate gear 22 is the rack 2
1 so that when the intermediate gear 22 rotates,
The base 12 and thus the movable holding member 11 move along the fixed movable member 32. Thereby, the seat body 2
Slidably moves forward in the vehicle traveling direction while rotating and moving in the direction of the getting on / off rotation position (interlocking range).

Next, a seat driving mechanism 40 for rotating and sliding the seat body 2 will be described. An extension plate 41 is provided at a rear portion of the base 12.
The extension plate 41 is provided with a forward / reverse motor 42 as a drive source. As the motor 42,
For example, a DC motor, a DC brushless motor, or the like is used. A drive gear 43 is provided on an output shaft of the motor 42. A fan-shaped driven gear 4 is provided on the lower surface of the seat base.
4 are provided. The driving gear 43 and the driven gear 44
They are arranged to engage. The drive gear 43 and the driven gear 44 constitute a power transmission mechanism for transmitting the driving force of the motor 42 to the outer wheel 13a of the turntable 13.
The seat driving mechanism 40 is disposed so as to be within the range of the seat cushion 2a. That is, it is arranged using the space between the vertical support base 30 and the rotary support base 10 and the vertical space between the rotary support base 10 and the seat cushion 2a, and is provided so as not to protrude from the lower surface of the seat body 2. ing. Thereby, the seat drive mechanism 40 is covered by the seat cushion 2a, and safety is ensured.

Although not shown, an output shaft of the motor 42 is provided with an electromagnetic clutch. When the motor 42 fails, the main switch is operated to turn off the electromagnetic clutch. As a result, the seat body 2 is separated from the power transmission system, so that the seat body 2 can be manually operated. Although not shown, a rotation lock mechanism and a slide lock mechanism for locking the rotational movement and the slide movement of the vehicle body 2 are provided.
With these locking mechanisms, the rotational movement and the sliding movement of the seat body 2 are locked in a state where the seat body 2 is set at the boarding rotation position and the boarding / alighting rotation position, respectively. Further, as shown in FIG. 6, the power transmission mechanism may be changed to a configuration in which a reduction gear 45 is interposed between the drive gear 43 and the driven gear 44. Further, the function of the driven gear 44 can be provided directly on the outer periphery of the outer ring 13a.

Next, an embodiment of a control device for controlling the motor 42 is shown in FIG. The control device includes control means 50,
It comprises a driving means 51, a detecting means 52, an input means 53 such as various switches and the like. The driving unit 51 has a switching element such as a field effect transistor. The switching element of the driving means 51 is
On / off control is performed by 0. The driving power is supplied to the motor 42 via the driving unit 51. Detecting means 52
Detects the rotation state of the motor 42 and outputs a detection signal. As the detection means 52, for example, a Hall element for detecting a magnetic field of a magnet provided in a rotor of the motor 42, a Hall IC configured by a waveform shaping circuit for converting an output signal of the Hall element into a pulse signal, and the like. Is used. The number of the hall elements and the number of the detecting means 52 can be appropriately set. The control unit 50 controls the switch element of the driving unit 51 based on the signal from the input unit 53 and the detection signal from the detection unit 52. The waveform shaping process of the output signal from the Hall element or the like can also be performed by the control unit 50. In this case, the detection means 52 can omit the waveform shaping circuit.

The rotating seat 1 for a vehicle configured as described above.
8 will be described with reference to FIG. In FIG. 8, the rear position in the vehicle longitudinal movement range is indicated by reference symbol L0, and the front position is indicated by reference symbol L1, based on the rotation center of the seat body 2 (the rotation center of the turntable 13). FIG. 8A shows the seat body 2.
However, in the sliding direction, it is located at the rear position L0, and in the rotational direction, it is located at the boarding rotation position (posture facing the vehicle), that is, at the boarding position. FIG. 8B shows that the seat body 2 is in the rear position L in the sliding direction.
0, and shows a state where it is located at a position rotated about 26 degrees from the boarding rotation position to the getting on / off rotation position in the rotation direction. FIG. 8C shows that the seat body 2 is located at the front position L1 in the sliding direction, and is located at the getting on / off rotation position (sideways posture facing the door opening D side) in the rotating direction, that is, is located at the getting on / off position. The state is shown.

When the seat body 2 is located at the boarding rotation position shown in FIG. 8A, when the occupant gets on the vehicle, for example, the operator operates the getting off switch after unlocking the lock mechanism. I do. When the get off switch is operated, a get off signal is input to the control means 50. When the getting-off signal is input, the control unit 50 controls the switching element of the driving unit 51 to rotate the motor 42 in a predetermined rotation direction, for example, a normal rotation direction. When the motor 42 is driven to rotate forward, the driving force of the motor 42 is transmitted to the outer wheel 13a via the power transmission mechanism. As a result, the seat body 2 rotates from the boarding rotation position to the boarding / alighting rotation position. At the same time, the pinion gear 24 also rotates (counterclockwise in FIG. 5). Until the seat body 2 rotates about 26 degrees in the direction of the getting on / off rotation position, the pinion gear 24 and the intermediate gear 22 do not mesh with each other, so that only the rotation movement of the seat body 2 is performed. At this stage, as shown in FIG. 8B, the seat main body 2 has reached the rear portion of the door opening D, that is, the position just before the seat cushion 2a interferes with the rear pillar P. If the seat body 2 is further rotated in this state, the seat body 2 interferes with the rear pillar P, so that the seat body 2 cannot be rotated and moved to a sideways posture (a boarding / alighting rotation position) facing the door opening D side.

When the seat body 2 rotates about 26 degrees in the direction of the getting on / off rotation position, the pinion gear 24 starts to mesh with the intermediate gear 22. Therefore, when the seat body 2 is further rotated, the seat body 2 slides forward due to the meshing action between the pinion gear 24 and the intermediate gear 22 and the meshing action between the intermediate gear 22 and the rack 21. In this way, the seat body 2 slides forward while rotating and rotating for the remaining approximately 64 degrees. Thereby, the seat body 2
Of the occupant is prevented from interfering with the front end of the door opening D during the rotational movement of the occupant. That is, in a rotating seat in which the seat body 2 is once slid to the front position and then rotationally moved, there is a problem that an occupant's foot or the like interferes with the front end of the door opening (body). Problems can be avoided.

As shown in FIG. 8 (C), when the seat body 2 is in a horizontal position facing the door opening D side (a boarding / alighting rotation position) and reaches a front position L1 (a boarding / alighting position), for example, An on / off position detector such as a limit switch provided on the direction support base 30 operates. When the getting-on / off position detector operates, a getting-on / off position detection signal is input to the control means 50. The control unit 50 controls the driving unit 51 to stop the motor 42 when the getting-on / off position detection signal is input.
The seat body 2 is locked at the entry / exit rotation position by a lock mechanism from rotating and sliding. Then, by operating the swing swing type elevating mechanism at the getting on / off rotation position, the seat main body 2 moves up and down in an arc shape between the room and the outside.

When returning the seat body 2 from the getting on / off rotation position shown in FIG. 8 (C) to the getting on / off rotation position shown in FIG. 8 (A), the ride switch is operated. When a ride signal is input from the ride switch, the control means 50 controls the drive means 51 to reverse the motor 42. When the motor 42 rotates in the reverse direction, the outer ring 13a rotates in the reverse direction (clockwise in FIG. 5). At this time,
Since the pinion gear 24 and the intermediate gear 22 and the intermediate gear 22 and the rack 21 are held in mesh with each other,
The seat body 2 slides from the front position L1 to the rear position L0 while rotating and moving in the direction of the boarding rotation position in the opposite direction. At the stage where the seat body 2 has been rotated to the boarding rotation position side by about 64 degrees from the boarding / alighting rotation position,
4 and the intermediate gear 22 are disengaged. For this reason, in the remaining range of 26 degrees, only the rotational movement of the seat body 2 is performed, and the sliding movement in the front-back direction is not performed. And
When the seat body 2 reaches the boarding rotation position, a boarding position detector such as a limit switch operates to output a boarding position detection signal. When the boarding position detection signal is input from the boarding position detector, the control unit 50 controls the driving unit 51 to stop the motor 42. Thereafter, as described above, the rotational movement and the sliding movement of the seat body 2 are locked by the lock mechanism.

When the end of the seat or the occupant comes into contact with the vehicle equipment while the seat body 2 is being rotated, the driving of the motor 42 is stopped or the motor 4 is stopped.
2 needs to be reversed. For this purpose, it is necessary to determine that the end of the seat or the occupant is in contact with the vehicle equipment, that is, that the motor 42 is in an overloaded state. Hereinafter, the overload state determination processing of the present invention will be described.
When a Hall IC is used as the detecting means 52, the Hall element provided in the Hall IC outputs a signal corresponding to the rotation of the rotor of the motor 42. For example, motor 4
When the N pole of the magnet provided in the second rotor passes, a positive signal is output, and when the S pole passes, a negative signal is output. Then, the waveform shaping circuit provided in the Hall IC shapes the waveform of the output signal of the Hall element and outputs it. For example, a pulse signal of level "1" is generated when a positive polarity signal is output from the Hall element, and a level "0" is generated when a negative polarity signal is output. FIG. 9 shows a waveform diagram of the pulse signal generated from the detection means 52.

When the end of the seat or the occupant comes into contact with the vehicle equipment and the rotation speed of the motor 42 decreases after the rotation of the seat body 2 starts, the pulse signal generated by the detection means 52 changes. Therefore, the control means 50 is provided with the detecting means 52
By detecting that the pulse signal generated from the motor has changed, an overload state, that is, a decrease in the rotation speed of the motor 42 due to the end of the seat or the occupant contacting the vehicle equipment is determined. In this embodiment, the average value of the cycle of the latest consecutive plural, for example, four pulse signals is obtained, and the calculated average value of the cycle of the pulse signal is compared with the cycle of the newly generated pulse signal. The overload state is determined by the following.

The overload judging process of this embodiment will be described with reference to FIG. First, the latest four consecutive pulse signals P1
ＰP4 are measured. Pulse signal P1
There are various methods for measuring the periods T1 to T4 of P4. For example, there is a method of measuring a time from a rising point (or a falling point) of a pulse signal to a rising point (or a falling point) of the next pulse signal, and using the measured value as a period of the pulse signal. Alternatively, the time t1 to t4 (or the time of level “0”) of the level “1” from the rising point (or the falling point) to the falling point (or the rising point) of the pulse signal is measured, and the measured values t1 to t4 are measured. There is a method in which twice of t4 is set as the period of the pulse signal. Then, four pulse signals P1
The average value T 'of the periods T1 to T4 of .about.P4 is obtained. There are various methods for obtaining the average value T '. For example,
Average value T 'of periods T1 to T4 of each pulse signal P1 to P4
(T ′ = [T1 + T2 + T3 + T4] / 4) is available. Alternatively, the time t of the level “1” from the rising point (or falling point) of each of the pulse signals P1 to P4 to the falling point (or rising point).
Average value t ′ of 1 to t4 (or time of level “0”)
(T ′ = [t1 + t2 + t3 + t4] / 4) is obtained, and twice the average value t ′ is used as the average value T ′. When this method is used, the period T1 of each of the pulse signals P1 to P4
There is no need to determine ~ T4. Next, four pulse signals P
The average value T 'of the periods 1 to P4 is compared with the period Tn of the newly generated pulse signal Pn to determine whether or not an overload state exists. There are various methods for determining the overload state based on the comparison result between the average value T 'and the cycle Tn. For example, there is a method of determining that an overload state is established when the condition of Tn ≧ 1.8T ′ is satisfied. Alternatively, each cycle Tn of two consecutively generated pulse signals
There is a method of determining that an overload state exists when the condition of Tn ≧ 1.5T ′ is satisfied.

The method of determining whether or not the vehicle is in the overload state based on the change in the pulse signal is not limited to the method of the first embodiment, but can be variously changed. For example, the number of pulse signals for obtaining the average value of the period of the pulse signal is not limited to four. Further, the cycle of the immediately preceding pulse signal may be compared with the cycle of the newly generated pulse signal. Further, it is not necessary to use the latest pulse signal as the reference pulse signal. Also, instead of comparing the cycles,
The rising point (or the falling point) of the pulse signal
Alternatively, it may be determined whether or not the vehicle is in the overload state by comparing the time from the time point until the falling point (or the falling point). Various reference values can be set as the reference value for determining that the vehicle is in the overload state.

In the above embodiment, since the control means 50 does not have a speed control function for controlling the rotation speed of the motor 42 to the set speed, the voltage change of the vehicle-mounted battery as the power source, the weight of the occupant, The current value of the motor fluctuates depending on the accuracy of assembling the components. That is, the detecting means 5
The period of the pulse signal generated from the second signal does not become constant. Therefore, in order to detect a change in the pulse signal, it is necessary to perform processing for obtaining the cycle of the pulse signal generated in the past. Therefore, a second embodiment capable of detecting a change in a pulse signal without performing a process of calculating a cycle of a pulse signal generated in the past will be described below. In the present embodiment, the control unit 50 detects the rotation speed of the motor 42 and controls the driving unit 51 so that the rotation speed of the motor 42 matches the set speed. There are various methods for detecting the rotation speed of the motor 42. In the present embodiment, the rotation speed of the motor 42 is detected based on the cycle of the pulse signal generated from the detection means 52. There are various methods for comparing the rotational speed of the motor with the set speed. In the present embodiment, the detecting means 52
Is compared with the cycle of the pulse signal at the set speed (set cycle). Also,
There are various methods for controlling the driving unit 51 so that the rotation speed of the motor matches the set speed. In the present embodiment, the control unit 50 controls the switching element of the driving unit 51 by pulse width modulation (PWM) according to the result of comparison between the rotation speed of the motor 42 and the set speed.

FIG. 10 shows a waveform diagram of a pulse signal generated from the detecting means 52 in the present embodiment. In the present embodiment, the control unit 50 controls the rotation speed of the motor 42 so as to match the set speed. Therefore, in the normal state, the time t from the rising point to the falling point of the pulse signal generated from the detecting means 52 is t.
(Pulse width) is constant. Thus, in the present embodiment, the control unit 50 determines whether or not the width t of each pulse signal generated from the detection unit 52 is in an overload state based on a result of comparison with the set width ts. . That is, t <
If it is ts, it is determined that the state is normal. On the other hand, if t ≧ ts, it is determined that the vehicle is in an overload state. In the present embodiment, it is possible to determine whether or not an overload state is present for each pulse signal generated from the detection means 52. Therefore, it is possible to immediately determine that the vehicle is in the overload state. Further, since it is not necessary to perform a process of calculating the cycle of the pulse signal generated in the past, the control unit 50 is not required.
Processing load is reduced.

By providing a speed control function for controlling the rotation speed of the motor to the set speed, the rotation time of the seat can be made substantially constant regardless of the presence or absence of an occupant. Also,
There is no sharp rotation on a down slope or a delay in rotation time on an up slope. In addition, when the vehicle does not have the speed control function, it is necessary to change the motor or the number of gear teeth to change the rotation speed of the seat. However,
If a speed control function is provided, it can be easily dealt with only by changing the program.

In the second embodiment, the overload state is determined based on the result of comparison between the set point and the time from the rising point to the falling point of the pulse signal. It is not limited to this. For example,
The time from the falling time to the rising time of the pulse signal may be compared with a set value. Alternatively, the period of the pulse signal may be compared with a set value. Further, as in the first embodiment, a plurality of set values, for example, a first set value and a second set value (first set value <second set value) are provided, and the width of the pulse signal is set to the second set value. It is determined that an overload condition is determined when the load value is equal to or more than a set value, or that an overload condition is determined when each width of two consecutively generated pulse signals is equal to or more than a first set value. It may be.

In the above embodiment, the rotary seat that can be rotated and slid by the driving of the motor has been described. However, the present invention can be applied to rotary seats having various configurations. Further, as the detecting means, various detecting means can be used as long as a pulse can be generated according to the rotation of the motor. The method of determining the period of the pulse signal is appropriately changed according to the output form of the pulse signal output from the detection unit.

[0028]

As described above, the use of the driving device for a rotating seat for a vehicle according to the first aspect ensures that an overload state can be reliably achieved regardless of the weight of the occupant or the variation in the assembling accuracy of each component. Can be determined. Further, by using the driving device for a rotating seat for a vehicle according to the second aspect, it is possible to reliably determine the overload state with a simple configuration. Further, by using the driving device for a rotating seat for a vehicle according to the third aspect, it is possible to reliably determine the overload state with a simple configuration irrespective of the occupant's weight and the variation in the assembling accuracy of each component. it can. In addition, the circuit configuration is further simplified by using the driving apparatus for a rotating seat for a vehicle according to the fourth aspect.

[Brief description of the drawings]

FIG. 1 is a plan view showing an arrangement of a rotating seat for a vehicle in a room.

FIG. 2 is a perspective view of a seat body.

FIG. 3 is a perspective view of an example of an interlocking mechanism that interlocks rotational movement and sliding movement of a seat body.

FIG. 4 is a cross-sectional view of a linear guide mechanism that guides the slide movement of the rotation support base.

FIG. 5 is a plan view of an example of an interlocking mechanism that interlocks rotational movement and slide movement of the seat body.

FIG. 6 is a perspective view of another example of the interlocking mechanism.

FIG. 7 is a diagram showing an embodiment of the control device of the present invention.

FIG. 8 is a plan view showing the operation of the vehicle rotating seat.

FIG. 9 is a diagram illustrating an example of a process of determining an overload state based on the width of a pulse signal output from a detection unit.

FIG. 10 is a diagram illustrating another example of a process of determining an overload state based on the width of a pulse signal output from a detection unit.

FIG. 11 is a diagram illustrating a process of determining an overload state of a conventional driving device for a rotating seat for a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating seat for vehicles 2 Seat main body 10 Rotation support stand 13 Turntable 13a Outer ring 13b Inner ring 20 Rotation slide mechanism 21 Rack 22 Intermediate gear 24 Pinion gear 30 Front and back direction support stand 40 Seat drive mechanism 42 Motor 43 Drive gear 44 Follower gear 50 Control means 51 driving means 52 detecting means

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Claims (4)

[Claims] 1. A driving device for a vehicular rotary seat for rotating a seat between a boarding rotation position and a getting on / off rotation position by a motor via a turntable, comprising: a control device for controlling a motor; Is a drive device for a vehicular rotary seat that determines an overload state based on a change in a pulse generated according to rotation of a motor. 2. The driving device for a rotating seat for a vehicle according to claim 1, wherein the control device averages a pulse period of the pulse and a pulse period of a plurality of pulses generated before the pulse. A drive device for a vehicular rotary seat that determines an overload state based on a result of comparison with a value. 3. A driving device for a vehicular rotary seat for rotating a seat between a boarding rotation position and a getting on / off rotation position via a turntable by a motor, comprising: a control device for controlling a motor; A drive device for a vehicular rotary seat that controls the motor based on a deviation between the rotation speed of the motor and a set speed and determines an overload state based on a pulse width generated according to the rotation of the motor. . 4. The drive device for a vehicular rotary seat according to claim 3, wherein the control device obtains a rotation speed of the motor based on a cycle of a pulse generated according to rotation of the motor. Drive for rotating seats.