JPH06217847A - Motor control method and motor control device for power seat with lumbar support device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the lumbar vertebrae from moving away from the lumbar plate and to prevent them from slipping. [Configuration] Automatic control of the lumbar plate that repeatedly moves the lumbar plate 24 in the front-rear direction can be executed under the reverse drive of the lumbar motor, and the neutral position θ1 of the seat back 26 corresponding to the drive position can be executed. The backward tilt position θ2, which is tilted backward by about 10 °, can be set with one touch by driving the corresponding reclining motor accompanying a predetermined switch operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumbar support for adjusting the anterior-posterior position of a lumbar plate by driving control of a motor to support the lumbar spine of a seated person and reduce fatigue under a desired lumbar spine supporting force. The present invention relates to a motor control method and a motor control device for a power seat with a device.

[0002]

2. Description of the Related Art For example, a lumbar support device built in a seat back and supporting the lumbar spine of an occupant under an appropriate supporting force stabilizes the sitting posture and reduces fatigue of the occupant. Widely installed in automobile seats.

The lumbar support device includes, for example, a lumbar plate that is movably supported in an anteroposterior direction at an upper and lower position capable of supporting the lumbar spine of a seated person, and the pushing force from the lumbar plate serves as the lumbar spine support force. It is configured to act on the lumbar spine.

Here, as a lumbar support device, for example, a configuration is known which is capable of adjusting the anterior-posterior position of the lumbar plate, that is, the lumbar support force from the lumbar plate, under the drive control of a motor. Such a so-called power type lumbar support device is usually mounted on a power seat whose seating posture can be adjusted under the drive control of various motors.
Usually, the power seat motor control device can drive and control other motors.

According to such a power type lumbar support device, the lumbar support force from the lumbar plate can be adjusted under the operation of a corresponding switch connected to the motor control device. The lumbar spine supporting force can be easily obtained according to the preference and the degree of fatigue.

[0006]

In the known configuration, the lumbar spine of a seated person is normally pressed and supported under a constant lumbar support force from the lumbar plate in a stationary state.

However, even if the anterior and posterior positions of the lumbar plate are adjusted so that a comfortable lumbar support force can be obtained, the degree of fatigue of the seated person changes with the passage of time, and the seated person himself / herself is so called. Because of the sensual habituation, it is easy for the seated person to feel a lack of lumbar support.

Therefore, when operating for a long time,
The comfort of the seated person cannot be maintained sufficiently.

Here, for example, the lumbar plate is repeatedly and repeatedly moved in the anteroposterior direction under the drive of a corresponding lumbar motor to positively press the lumbar vertebra of the seated person.
It is conceivable that the lumbar spine is reduced in fatigue by the so-called acupressure effect and massage effect.

However, in such a structure, since the lumbar plate is moved forward from the static support position to repeatedly press strongly against the lumbar vertebra of the seated person, the seated person's seat is seated due to the slip of the seat cushion or the like. There is a risk of losing posture, which is not preferable.

When the sitting posture is collapsed due to hip slippage, the lumbar vertebra of the seated person is separated from the lumbar plate or the position of the lumbar vertebra with respect to the lumbar plate is displaced. When the lumbar plate is stopped, there is a possibility that the main purpose of the lumbar support device, such as reduction of fatigue, may not be sufficiently achieved.

An object of the present invention is to provide a motor control method and a motor control device for a power seat with a lumbar support device, which prevents the lumbar vertebrae from moving away from the lumbar plate, shifts and the like, and positively reduces fatigue during sitting. There is.

[0013]

In order to achieve this object, according to the motor control method for a power seat with a lumbar support device of the present invention, the lumbar motor is repeatedly driven in reverse, and the lumbar plate is moved a predetermined number of times. It is possible to execute automatic control in which the lumbar spine of a seated person is dynamically pressed and supported by repeatedly moving the anterior-posterior direction within a range for a predetermined operating time. In addition, a backward tilted position that is tilted backward by a predetermined angle from the neutral position of the seat back that is preset as a position corresponding to the drive position can be set with one touch by driving the corresponding reclining motor accompanying a predetermined switch operation. I am trying.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a motor control device for a power seat with a lumbar support device according to the present invention.
Reference numeral 10 includes a switch means 12 and a control circuit 14, and corresponding motors M1 to M3 are operated by a predetermined switch operation.
Are configured to be drive-controllable.

Normally, DC geared motors can be used as the motors M1 to M3, respectively. As shown in FIG. 1, the motors M1 to M3 include seating posture control devices mounted on a power seat (for example, a driver seat) 16, such as a lumbar support device 18, a reclining device 20, and
Each of them is provided as a drive source of the seat slide device 22.

By driving and controlling the motors M1 to M3 and operating the corresponding seating posture control devices 18 to 22, respectively, the front and rear positions of the lumbar plate 24, the inclination angle (reclining angle) of the seat back 26, and The overall front and rear position of the seat 16 can be adjusted.

The constructions of the lumbar support device 18, the reclining device 20, and the seat slide device 22 are well known, and the constructions themselves are not the gist of the present invention, and therefore will not be described in detail.

As can be seen from FIG. 2, the motors M1 to M3 are respectively connected to power sources, for example, automobile batteries (BATT) via relay contacts RL1a to RL6a of motor control relays RL1 to RL6 which will be described later. It is connected. And
Relay contacts RL1a corresponding to motor control relays RL1 to RL6
By switching RL6a, the corresponding motors M1 to M3 can be switched between forward rotation and reverse rotation.

Further, in such a motor control device 10, as shown in FIG.
LS1 to LS3 are provided respectively corresponding to the motors M1 to M3, and the movement range of the lumbar plate 24, the swing range of the seat back 26, and the slide range of the seat 16 are respectively detected by detecting each member by the limit switch. It is prescribed.

The limit switch LS1 which defines the movement range of the lumbar plate 24 is formed by having switches LS1-1 and LS1-2 which are, for example, push-button switches of an automatic reset type, and each switch is located in front of the lumbar plate. The limit position and the rear limit position are respectively provided at locations where they can be detected.

Such switches LS1-1 and LS1-2 are, for example, normally in the OFF state, and the respective ON operations accompanying the arrival of the lumbar plate 24 to the limit position cause the corresponding relay contacts RL1a and RL2a. Is switched to shut off the supply current to the motor (motor for lumbar) M1 and immediately stop the motor.

As the limit switch LS2 for defining the swing range of the seat back 26, for example, a potentiometer can be used, and the potentiometer is arranged at a position where the swing of the seat back can be detected. The limit switch LS2 consisting of such a potentiometer is normally in the ON state and the seat back to the limit position.
It is configured to immediately stop the corresponding motor (reclining motor) M2 by the OFF operation accompanying the arrival of 26.

Further, the limit switch LS3 which defines the sliding range of the seat 16 is formed by including switches LS3-1 and LS3-2 which are, for example, automatic reset push-off switches, and each switch is a seat switch. They are arranged at the positions corresponding to the front limit position and the rear limit position, respectively.

Such switches LS3-1 and LS3-2 are normally in the ON state, and the seat is moved to the slide limit position.
The motor (sliding motor) M3 can be stopped by each OFF operation when 16 is reached.

In such a configuration, the limit switch LS
1 to LS3 reliably define the moving range of the lumbar plate 24, the swinging range of the seat back 26, and the sliding range of the seat 16, and prevent the motors M1 to M3 from being restricted at the limit position. . Therefore, the movable members such as the lumbar plate 24 and the members near the limit position can be prevented from being damaged or damaged, and the motors M1 to M3 can be prevented from being overheated or damaged due to the restraint. To be done.

The motors M1 to M3 are, for example, switch means.
12 is configured so that drive control is possible. As shown in FIG. 2, the switch means 12 includes, for example, motors M1 to M3.
A series of manual switches for individual manual control of the
28 to 32 are formed.

As the manual switches 28 to 32, for example, seesaw switches and slide switches of the automatic return type can be used, and each switch includes a lumbar switch 28 corresponding to the motors M1 to M3, a reclining switch 30,
Each of them is formed as a slide switch 32.

As can be seen from FIG. 2, the manual switches 28 to 32 are motor control relays RL1 to RL corresponding to the motors M1 to M3 in the control circuit 14.
Connected to 6 respectively.

As shown in FIG. 1, the switch means 12
Is provided at a position where a seated person (driver) can operate, for example, at the side of the seat cushion 34 of the seat 16. However, the switch means 12 is not limited to the side of the seat cushion 34, as long as it can be operated by a seated person, and the switch means 12 may be provided at another position, such as a console box.

Here, in the motor control device 10 of the present invention, in addition to the manual control for arbitrarily adjusting the front and rear positions of the lumbar plate 24 by operating the lumbar switch 28, the lumbar plate is automatically moved within a predetermined range. It is possible to execute so-called automatic control of moving the robot back and forth.

The automatic control of the lumbar plate 24 is executed, for example, under the operation of the automatic switch 36 provided as a part of the switch means 12. As shown in FIG. 2, for example, an automatic reset type push switch can be used as the auto switch 36, and the auto switch is connected to the control circuit 14.

The control circuit 14 has, for example, an oscillating circuit 38 that almost periodically generates a rectangular pulse having a predetermined pulse width and two output terminals 40a and 40b that generate the rectangular pulse.
And an alternate drive circuit 40 that alternately outputs to. Then, the auto switch 36 is connected to the oscillation circuit 38, and the generation of the rectangular pulse is started by turning ON the auto switch.

The motor control relays RL1 and RL2 corresponding to the lumbar motor M1 are connected to the output terminals 40a and 40b of the alternating drive circuit 40 via, for example, the switching means 42 and 43 of the two systems.
Respectively connected to. Switching means 42, 43
Are formed, for example, with transistors Q1 and Q2, respectively, and are configured to switch the energization and deenergization of the corresponding motor control relays RL1 and RL2 by turning on the transistors when a rectangular pulse is output.

As can be seen from FIG. 2, these oscillator circuit 38, alternate drive circuit 40, switching means 42, 4
The third and the like are connected to the stabilized power supply 46, and can operate under the current regulated by the stabilized power supply.

As shown in FIGS. 2 and 3, for example, when the auto switch 36 is turned on, a rectangular pulse having a predetermined pulse width is output from the oscillation circuit 38 to the alternating drive circuit 40. Then, the rectangular pulse is distributed by the alternating drive circuit 40 and alternately output to the output terminals 40a and 40b, and the switching means 42 and 43, that is, the transistors Q1 and Q2 are alternately turned on when the rectangular pulse is output.

As described above, the transistors Q1 and Q2 are alternately arranged.
When the ON operation is performed, the lumbar motor M1 is reversely driven for a time corresponding to the pulse width, and the lumbar plate 24 is repeatedly moved between the initial position and the front position as shown in FIG.

With such a configuration, the lumbar plate 24
Moves forward from an arbitrarily adjusted initial position, so the lumbar spine of the seated person is dynamically pressed under strong support force,
Supported. Therefore, by the so-called acupressure effect and massage effect by the lumbar plate 24, fatigue of the lumbar vertebra of the seated person is positively reduced, and stable support of the lumbar vertebra can be sufficiently ensured, and comfort of the seated person is improved. .

Since the lumbar vertebra of the seated person is dynamically pressed and supported by the lumbar plate 24, the sensory habituation of the seated person due to static support can be sufficiently suppressed. Therefore, it is possible to sufficiently eliminate the feeling of lack of lumbar spine supporting force caused by the occupant's sensory habituation, and also in this respect, the comfort of the occupant is improved.

The generation time of the rectangular pulse, that is, the automatic control time of the lumbar plate 24 is preset in, for example, the timer 48, and the execution time of the automatic control is measured by the timer.

As shown in FIG. 3, as the timer 48, for example, a configuration can be used in which an ON signal is output by the ON operation of the auto switch 36 and the ON signal disappears as the set time elapses. As can be seen from FIG. 2, the timer 48 is connected to the oscillating circuit 38 and is configured to enable the oscillating circuit 38 only when the ON signal is output.

In the motor control device 10 of the present invention, the operation of the lumbar switch 28 is prioritized. In other words, even during the automatic control of the lumbar plate 24, the lumbar plate front and rear positions can be arbitrarily adjusted by operating the lumbar switch 28. Then, if the operating force of the lumbar switch 28 is released, the repetitive movement of the lumbar plate 24 by the reverse driving of the lumbar motor M1 is continuously executed until the set time of the timer 48 elapses.

By the way, such a lumbar plate 24
During the repeated movement of, i.e., during the automatic control, the lumbar plate moves forward from the initial position, so that the lumbar region of the seated person is entirely pushed and the seated person is seated due to the hip slip on the seat cushion 34. There is a risk of losing posture. Therefore, in the present invention, for example,
The seat back 26 is tilted backward from the drive position by a predetermined angle to enable automatic control of the seat back to prevent back slipping and the like.

In this case, the drive position of the seat back 26 is generally from the vertical line θ 0 to 25 as shown in FIG.
This is because it is set to a position that is tilted backward by about °.
The drive position tilted backward by about 25 ° is specified in advance as the seat back neutral position θ1.
A position further tilted backward from the neutral position (drive position) θ1 by a predetermined angle is set in advance as a rearward tilted position θ2 of the seat back 26 for suppressing the hip slip of the seated person.

The rearward tilt position θ 2 of the seat back 26 is
For example, it is set as a position tilted backward by about 10 ° from the neutral position θ1. Then, a backward tilt position θ that is tilted 10 ° backward from this neutral position
2 is a reclining angle that corresponds to a relaxed position that reduces the burden of sitting, for example.

During the automatic control, the neutral position θ1 and the backward tilt position θ2 of the seat back 26 are
For example, it is detected and regulated by the position detecting means LS4. The position detection means LS4 is, for example, a switch LS4- which is an automatic reset push-off switch.
1 and LS4-2, each switch is arranged at a position where the neutral position and the rearward tilt position of the seat back 26 can be detected (see FIG. 1).

Further, switching between automatic control and manual control of the seat back 26 is performed by the select switch 50. As shown in FIG. 2, as the select switch 50, for example, a holding type double changeover switch is used, and the subside 50-2 can be integrally changed over in accordance with the changeover operation of the main side 50-1. ing. The select switch 50 is formed as a part of the switch means 12 like other switches.

As can be seen from FIG. 2, in the illustrated select switch 50, the contact 50a is formed as the auto side, and the contact of the auto side, for example, the holding relays RL7 and RL8 are the respective switching contacts RL7a and RL8a. Is connected with. The holding relays RL7 and RL8 are urged by the operation of the reclining switch 30 after the selection switch 50 is switched to the auto side, and continuously drive the reclining motor M2 even after the operating force of the switch is released. Is configured.

In such a structure, the seat back 26
When reaches either the neutral position θ1 or the backward tilt position θ2, the corresponding switch of the position detection means LS4 is turned off, the supply current to the holding relays RL7 and RL8 is cut off, and the reclining motor M2 immediately stops. , The seat back is set to either position.

That is, the holding relays RL7 and RL8 make the switch operation of the automatic control of the seat back 26 a one-touch type in which each position of the seat back is set under an instantaneous operation. According to such a configuration,
Since the switch operation is simplified, the operability is improved.

For example, when the reclining switch 30 is operated in the backward direction during the automatic selection by the select switch 50, the seat back 24 is biased by the holding relay RL8 to cause the reclining motor M2 to rotate in the neutral position θ1. Is swung to the backward tilt position θ2. Then, the switch LS of the position detection means LS4
When the seat back 26 is detected by 4-1, the reclining motor M2 is stopped and the seat back is set to the backward tilt position θ2.

At the rearward tilt position θ2 of the seat back 26, the lumbar plate 24 moves diagonally upward and backward, so that the forward lumbar vertebrae is restrained as compared with the forward and backward movement at the neutral position θ1. . At the rearward tilt position θ2 of the seat back 26,
Since the lumbar vertebra of the seated person is pressed against the lumbar plate 24 under its own weight, the closeness of contact between the lumbar plate and the lumbar vertebra is increased.

That is, according to the motor control method for a power seat with a lumbar support device of the present invention, the sitting posture is collapsed due to the occupant's buttocks, etc., and the lumbar vertebrae are separated from the lumbar plate and are sufficiently displaced. Since the lumbar vertebra support force from the lumbar plate is efficiently transmitted to the lumbar vertebra of the seated person, the comfort of the seated person is further improved.

Since the rearward tilt position θ 2 of the seat back 24 corresponds to a reclining angle (relaxed posture) which is easy to relax and reduces the burden of sitting.
In addition to reducing fatigue in the lumbar spine, fatigue in the whole body of the seated person is reduced. Therefore, synergistic effect with lumbar plate 24 fatigue reduction of the lumbar spine can be expected sufficiently, comfort of the seated person,
Safety etc. is further improved.

When the reclining switch 30 is operated in the forward direction during the automatic selection by the select switch 50, the seatback 24 moves the reclining motor M2.
Under the normal rotation of, the vehicle is returned from the backward tilt position θ2 to the neutral position θ1. That is, according to the automatic control of the seat back 26, since the seat back 26 can always return to the preset neutral position θ1, it is possible to easily obtain a position close to an arbitrary position of the seated person.

Therefore, even when the seat back 26 is returned to the neutral position θ1, the switch operation is not complicated and the operability is sufficiently improved.

According to the motor control device 10 of the power seat with the lumbar support device of the present invention, the above-mentioned motor control method can be appropriately executed, and the automatic control of the lumbar plate 24 that positively reduces the fatigue of the seated person. Can be effectively executed. Therefore, the prevention of accumulated fatigue is sufficiently taken, and the safety and comfort of the seated person are secured.

In this embodiment, the neutral position θ1 is a position tilted backward by about 25 ° from the vertical line θ0, and the backward tilt position θ2 is a position tilted further backward by about 10 ° from the neutral position. However, the present invention is not limited to this, and the neutral position and the backward tilt position may be set at other angles.

However, in particular, the backward tilt position θ2
About 10 ° from the neutral position θ1, that is,
If it is set at a position tilted backward by about 35 ° from the vertical line θ 0, the backward tilted position is set to the reclining angle corresponding to the relaxed position of the seated person. for that reason,
A synergistic effect of dynamic pressing of the lumbar spine by the lumbar plate 24 and reduction of fatigue of the whole body in addition to support can be expected sufficiently, and also in this respect, comfort and safety of the seated person can be sufficiently improved.

Further, in the present invention, the lumbar motor M1 is reversely driven by utilizing the rectangular pulse having the predetermined pulse width which is periodically generated by the oscillation circuit 38, and the lumbar plate 24 is repeatedly moved. However, the configuration is not limited to this, and the lumbar plate may be repeatedly moved by another configuration.

However, the rectangular pulse from the oscillating circuit 38 is switched by the alternate driving circuit 40 to the switching means 42, 43 of the two systems.
Alternately, the reversal drive of the lumbar motor M1, that is, the repetitive movement of the lumbar plate 24 can be easily obtained without complicating the configuration.

Further, in the embodiment, the holding relay RL7,
The RL8 uses a one-touch automatic control of the seat back 26, but it is sufficient to continuously drive the reclining motor M2 to the corresponding position under instantaneous switch operation, so a holding relay is used. Not limited to.

However, if the holding relays RL7 and RL8 are used, the switch operation at the time of automatic control of the seat back 26 can be made one-touch type only by adding the holding relays, so that the structure is not complicated and the cost is low. Can be provided.

The seat back 26 can be automatically controlled by operating the reclining switch 30 at the time of automatic selection by the select switch 50. However, the present invention is not limited to this. For example, another dedicated auto switch or the like can be used. The automatic control of the seat back may be enabled.

However, if the reclining switch 30 is used for both manual control and automatic control as in the embodiment, an increase in the number of parts can be prevented, and the structure can be sufficiently simplified.

Further, in the embodiment, the seat 16 is embodied as a power seat provided with the lumbar support device 18, the reclining device 20, and the seat slide device 22. However, at least a power seat provided with the lumbar support device 18 will suffice, and therefore the presence or absence of another seating posture control device does not matter. Further, the present invention is not limited to the driver seat, and the present invention may be applied to a motor control device of an assistant seat.

Incidentally, the embodiment is embodied as a motor control device for a power seat for an automobile. However, a power seat having a lumbar support device is sufficient, and thus the present invention is not limited to this.
The motor control device of the present invention may be applied to a seat or the like of an airplane or a ship.

The above-mentioned embodiments are for explaining the present invention and do not limit the present invention in any way.
It goes without saying that the present invention includes all those which are modified or modified within the technical scope of the present invention.

[0069]

As described above, according to the motor control method for a power seat with a lumbar support device according to the present invention, fatigue of the lumbar spine of a seated person can be prevented by the so-called acupressure effect and massage effect by the automatic control of the lumbar plate. Since it can be positively reduced, the comfort of the seated person is improved.

Since the seat back is tilted backward from the drive position by a predetermined angle due to the automatic seat back control, the seating posture is collapsed due to the back slip of the seated person even during the automatic control of the lumbar plate.
Moreover, the lumbar spine can be sufficiently separated from the lumbar plate, and can be prevented from being displaced. Therefore, the adhesion between the lumbar plate and the lumbar vertebra is sufficiently increased, and the lumbar vertebra supporting force from the lumbar plate is efficiently transmitted to and acts on the lumbar vertebra of the seated person, whereby the comfort of the seated person is further improved.

If the backward tilted position of the seat back is made to correspond to the relaxed posture, the fatigue of the lumbar spine is reduced, and the fatigue of the whole body of the seated person is reduced. Therefore, the lumbar plate reduces the fatigue of the lumbar spine. The effect can be expected sufficiently, and in this respect, the comfort and safety of the seated person are further improved.

Further, if rectangular pulses having a predetermined pulse width that are periodically generated are alternately output to the switching means of the two systems, and the lumbar motor is driven in reverse, the structure is not complicated. The reverse drive of the lumbar motor, that is, the repetitive movement of the lumbar plate can be easily obtained.

According to the motor control device for the power seat with the lumbar support device of the present invention, the above motor control method can be appropriately executed, and the automatic control of the lumbar plate that positively reduces the fatigue of the seated person is effective. Can be executed automatically. Therefore, the prevention of accumulated fatigue is sufficiently taken, and the safety and comfort of the seated person are secured.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a motor control device for a power seat with a lumbar support device according to the present invention.

FIG. 2 is a circuit diagram of a motor control device for a power seat with a lumbar support device.

FIG. 3 is a time chart during the automatic control of the lumbar plate in the motor control method for the power seat with the lumbar support device according to the present invention.

FIG. 4 is a schematic side view of a seat showing a swing range of a seat back in a motor control method for a power seat with a lumbar support device according to the present invention.

[Explanation of symbols]

10 Motor control device for power seat with lumbar support device 12 Switch means 14 Control circuit 16 Seat (power seat) 18 Lumbar support device 20 Reclining device 24 Lumbar plate 26 Seat back 28 Switch for lumbar (manual switch) 30 Switch for reclining (manual) 36) Auto switch 38 Oscillation circuit 40 Alternate drive circuit 42, 43 Switching means 48 Timer 50 Select switch M1 Lumbar motor M2 Reclining motor LS4 Position detection means RL1 to RL6 Motor control relay RL7, RL8 Holding relay Q1, Q2 transistor

Claims (7)

[Claims] 1. A lumbar plate supporting a lumbar vertebra of a seated person is controlled under the drive control of a corresponding lumbar motor.
In a motor control method for a power seat with a lumbar support device that moves at least in the front-rear direction, the lumbar motor is repeatedly driven in reverse, and the lumbar plate is repeatedly moved in the front-rear direction for a predetermined operating time within a predetermined repetitive movement range, Automatic control of the lumbar plate that dynamically presses and supports the occupant's lumbar spine can be performed in addition to manual control of the lumbar plate that statically supports the occupant's lumbar spine under any lumbar support force. At the same time, a backward tilt position that is tilted backward by a predetermined angle from the neutral position of the seat back that is preset as a position corresponding to the drive position can be set with one touch by driving the corresponding reclining motor accompanying a predetermined switch operation. Lumber support device characterized by Motor control method of the power seat. 2. The motor control of the power seat with the lumbar support device according to claim 1, wherein the backward tilt position is set to a position tilted backward by about 10 ° from the neutral position as a reclining angle corresponding to the relaxed posture of the seated person. Method. 3. The manual control and automatic control of the seat back are switched by the select switch, and when the automatic control is selected, the seat back is in the neutral position and the rear position under the manual switch switching operation in the corresponding direction. The motor control method for a power seat with a lumbar support device according to claim 1 or 2, wherein one of the tilt positions is set with one touch. 4. A rectangular pulse having a predetermined pulse width is generated in a specific cycle, and the generated rectangular pulse is alternately output to switching means of two systems, and the corresponding motor control relay is turned on and off by switching the switching means. 4. The motor control method for a power seat with a lumbar support device according to claim 1, wherein the lumbar motor is reversely driven by switching between energization and deenergization. 5. A lumbar motor for moving a lumbar plate supporting a lumbar vertebra of a seated person in the front-back direction, a reclining motor for rocking a seat back in the front-back direction, and a manual switch for manually controlling the corresponding motor. The auto switch that executes the automatic control of the lumbar plate, the manual switch of the seat back, the select switch that selects the automatic control, the position detection means that detects the neutral position and the backward tilt position of the seat back, and the input information A control circuit for appropriately controlling the drive of the corresponding motor is provided. With the operation of the auto switch, the auto control of the lumbar motor can be executed, and at the time of selecting the auto control by the select switch. Corresponding switch Under operation, by driving the reclining motor, the neutral position of the seat back, the motor control device for lumbar support device with a power seat which can be set to one of the rearward tilting position. 6. An oscillating circuit in which a control circuit periodically generates a rectangular pulse having a predetermined pulse width; an alternating drive circuit which alternately outputs sequentially generated rectangular pulses to two systems of switching means; a lumber plate And a timer for measuring the automatic control execution time of the, and by switching the energization / de-energization of the corresponding motor control relay by switching the switching means ON / OFF, the lumbar motor is reversed for the preset time set in the timer. The motor control device for a power seat with a lumbar support device according to claim 5, which is driven. 7. The control circuit includes a holding relay that is energized by operating a corresponding manual switch when automatic seatback control is selected, and the arrival of the seatback to the corresponding position is detected by the position detecting means. The motor control device for a power seat with a lumbar support device according to claim 5 or 6, wherein the reclining motor is continuously driven until it comes to the end.