JPH07107765A - Method and apparatus for controlling motor of power seat - Google Patents

Abstract

PURPOSE:To retrain a shock when a motor is started and stopped and to easily perform the fine adjustment and the coarse adjustment of a position for a moving member. CONSTITUTION:When the ON operation of an operating switch 12 is detected, a motor M is decelerated while a starting voltage is applied, and the speed of the motor is increased by a linear rise in an applied voltage E0 due to the charging of a capacitor C. Then, when the OFF operation of the operating switch 12 is detected, the applied voltage is lowered exponentially due to the discharge of the capacitor C only for a prescribed delay time by a delay-time means 14c, the motor M is decelerated, and the motor is stopped from a reduced-speed state after the delay time has elapsed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power seat motor control method in which the position of a movable member of a seating posture control device can be arbitrarily adjusted and set in accordance with the seated person's body shape, preferences, etc. by motor drive control. And a motor control device.

[0002]

2. Description of the Related Art For example, in a vehicle or the like, a so-called power seat equipped with various seating attitude control devices such as a seat slide device, a seat lifter, and a reclining device that are movable by drive control of a motor is known. Are known.

As such a power seat motor,
Generally, a DC geared motor (DC motor) is used.
The motor is connected to the motor control device, for example, and is configured to be drive-controllable by switching corresponding relay contacts of the motor control relay in accordance with ON operation and OFF operation of the operation switch of the motor control device.

[0004]

By the way, in a seating posture control device having a movable member having a relatively wide movement range, such as a seat in a seat slide device, rapid movement of the movable member is required. Therefore, in recent power seats, the speed of the motor is increased, and the high speed driving of the motor ensures a quick movement of the movable member.

However, in the known configuration, the start or stop of the motor is controlled by applying or shutting off the supply voltage to the motor according to the ON operation and the OFF operation of the operation switch. And then
Sudden start and stop of the motor cannot be avoided.

Particularly, in a movable member that directly supports the load of a seated person, such as a seat in a seat slide device, shocks at the time of starting and stopping the motor are easily transmitted to the seated person through the movable member. Therefore, the seated person may feel discomfort or anxiety. Further, shocks at the time of starting and stopping the motor may cause the seated posture to collapse, and the comfort of the seated person cannot be sufficiently ensured.

A shock at the time of starting and stopping the motor lowers the overall high-grade feeling of the power seat, and is not preferable in this respect as well.

Further, when the motor is driven at a high speed, the movable member can be quickly moved over a long distance, but the position of the movable member cannot be easily finely adjusted within a short distance. That is, it is inevitable that the switch operation is complicated during the fine adjustment.

An object of the present invention is to provide a motor control method and a motor control device for a power seat that suppresses shocks when starting and stopping a motor and facilitates fine and coarse adjustments of the position of a movable member. There is.

[0010]

To achieve this object, according to the power seat motor control method of the present invention, the voltage applied to the motor is suppressed to the starting voltage of the motor and the operation switch is turned on. Operation and OFF operation are detected by distinguishing the respective signals. Then, when the ON operation of the operation switch is detected, the starting voltage is applied to the motor by switching the corresponding relay contact of the motor control relay, the motor is driven at a low speed at the corresponding speed, and the motor After the start-up, an applied voltage that increases linearly with the charge of the capacitor is applied to the motor to increase the speed of the motor up to the maximum steady speed of the motor.

When the OFF operation of the operation switch is detected, the electric charge charged in the capacitor is discharged, and the switching of the relay contact of the motor control relay is delayed by a predetermined delay time delayed by the time delay means. ,
The motor is decelerated and driven under the exponential voltage drop caused by the discharge of the electric charge from the capacitor, and the motor is stopped from the decelerated state by switching the relay contacts with the elapse of the delay time.

[0012]

According to the present invention, since the motor can be soft-started and soft-stopped by starting the motor at a low speed and stopping the motor from a decelerating state, shocks at the time of starting and stopping the motor are sufficiently reduced.

[0013]

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

As shown in FIG. 1, a power seat motor control device 10 according to the present invention includes an operation switch 12, a switch detection circuit 14, and a control voltage waveform generation circuit 16, and turns on the operation switch. , OFF operation
It is configured to drive and control M.

Normally, a DC geared motor can be used as the motor M, and the motor is a movable member of the seating posture control device mounted on the seat 18, for example, in the seat slide device 20 as shown in FIG. It is provided at a corresponding position as a drive source for sliding itself.

It is operated under the drive of the motor M,
The configuration of the so-called power type seat slide device 20 is publicly known, and the configuration itself is not the gist of the present invention, and will not be described in detail here.

As shown in FIG. 1, as the operation switch 12, for example, an automatic restoration type seesaw type switch having a 2-position switching contact and a neutral position in which a main contact does not contact any of the switching contacts can be used. . Note that a general commercially available product can be used as the automatic reset type seesaw-type switch (operation switch) 12, so a detailed description of the configuration thereof will be omitted here.

The operation switch 12 is formed, for example, as a manual switch for manually controlling the motor M, and is located at a position where a seated person can operate, for example, at the side of the seat cushion 21 of the seat 18 as shown in FIG. It is arranged. However, the operation switch 12 is not limited to the side of the seat cushion 21 as long as it can be operated by a seated person, and the operation switch 12 may be arranged in, for example, a console box, an armrest (both not shown) of the inner wall of the door, or the like. .

As can be seen from FIG. 1, the operation switch
12 2-position switching contacts are switch detection circuits
14 connected to each. The switch detection circuit 14 is
For example, the relay drive circuit 22 is configured to include an ON determination unit 14a that determines the ON signal of the operation switch 12 and an OFF determination unit 14b that determines the OFF signal, from the generation of the ON signal to the disappearance of the OFF signal. Is configured to be turned on (see FIG. 3).

As can be seen from FIG. 1, the switch detection circuit 14 is formed by having a time delay means 14c on the side of the OFF discrimination means 14b for extending and delaying the signal output time by a predetermined time. ing. The time delay means 14c includes the OFF determination means 14b and the relay drive circuit 22.
Is intervened between.

In such a configuration, as shown in FIG.
The disappearance time of the OFF signal of the operation switch 12
Since the OFF operation of 12 is delayed by the predetermined delay time Td, the ON state of the relay drive circuit 22 is maintained for the time obtained by adding the delay time to the operation period of the operation switch.

Although the time delay means 14c is provided as a part of the switch detection circuit 14 in FIG. 1, it is sufficient if the OFF signal can be delayed, and the invention is not limited to this. The switch detection circuit and the switch detection circuit may be separately provided.

As shown in FIG. 1, the relay drive circuit 22
ON signal from the motor control relay RL
1, output to RL2. As the motor control relays RL1 and RL2, for example, electromagnetic relays that switch the corresponding relay contacts RL1a and RL2a by passing a current through a coil can be used.Each relay contact is connected to the winding terminal of the motor M. There is.

In such a structure, for example, by operating the operation switch 12 in any direction, the motor control relay on the corresponding side of the motor control relays RL1, RL2 is energized. Then, the motor control relay
Of RL1 and RL2, the relay contacts RL1a and RL2a corresponding to the energized motor control relay are switched, and the current in the corresponding direction flows to the motor M, which drives the motor M in the direction corresponding to the current (normal The seat 18 is slid in the front-rear direction.

The delay time Td by the time delay means 14c is appropriately set to, for example, 100 to 200 ms.

Here, as shown in FIG. 1, in the motor control device 10 of the power seat of the present invention, the voltage suppression circuit 26 for suppressing the supply voltage (battery voltage) from the power source, for example, the battery (BATT). The motor M can be started under the applied voltage that is provided and is suppressed by the voltage suppression circuit. The voltage suppression circuit 26 is configured, for example, to suppress the battery voltage up to the starting voltage of the motor M 1 and apply the suppressed voltage to the motor.

By the way, in such a configuration, normally, the applied voltage E0 of the motor M is set to the output voltage of the voltage suppression circuit 26.
The battery voltage is controlled under so-called feedback control that matches Ec. Such feedback control can be executed by the feedback control circuit 28. As can be seen from FIG. 1, the feedback control circuit is formed by including the voltage comparison circuit 30 and the voltage control circuit 32.

The feedback control circuit 28 is, for example,
The voltage comparison circuit 30 compares the output voltage Ec from the voltage suppression circuit 26 with the voltage E0 applied to the motor M, and the voltage control circuit 32 controls the battery voltage so that the voltage E0 matches the voltage Ec. ing.

Since such feedback control itself is known and the configuration of the feedback control circuit 28 is not the subject of the present invention, it will not be described in detail here.

In such a configuration, the motor M is started under the starting voltage, so that the motor can be started at a low speed. That is, since the shock at the time of starting the motor M is sufficiently suppressed, so-called soft start that does not give discomfort or anxiety caused by the shock to the seated person can be reliably executed.

The motor control device 10 of the present invention is
The voltage E0 applied to the motor M is gradually increased to the steady voltage of the battery to enable the motor speed to increase from the startup speed, and the motor is decelerated for a predetermined time after the operation switch 12 is turned off to reduce the speed. Is configured to stop the motor.

As shown in FIG. 1, in the present invention,
The voltage applied to the motor M is controlled by using the waveform output when the capacitor C provided in the control voltage waveform generation circuit 16 is charged and discharged. The charge or discharge of the electric charge to the capacitor C can be switched by the switch means 16a which operates in response to the ON signal and the OFF signal from the switch detection circuit 14, and its output voltage is the same as the output voltage from the voltage suppression circuit 26. Similarly, the feedback control circuit as voltage Ec
It is output to 28.

Switch means 16a of the control voltage waveform generating circuit
Is formed of, for example, an automatic reset type changeover switch having a 2-position changeover contact, and the constant current source 16b and the resistor R 1 are connected to the changeover contact, respectively. The main contact of the switch means 16a is usually a resistor.
It is possible to switch to the constant current source 16b side by contacting the R side and receiving an ON signal from the switch detection circuit 14.

In the above structure, when a switch detection circuit 14 outputs an ON discrimination detection signal (ON signal) as shown in part a of FIG. One of the corresponding switching contacts RL1a, RL2a of the control relays RL1, RL2 is switched under the operation of the relay drive circuit 22, and the motor is started at a low speed under the application of the starting voltage to the motor M. . At this time, the main contact of the switch means 16a of the control voltage waveform generating circuit is switched to the side of the constant current source 16b, and the charge of the capacitor C is started.

Here, when the capacitor C is being charged, the output voltage Ec rises linearly due to its characteristics.
As shown in part a of FIG. 3, the voltage E0 applied to the motor M increases linearly, and the motor speed tends to increase from the starting speed to the steady speed of the motor.

Then, for example, as shown in part a of FIG. 3, if the ON operation of the operation switch 12 is interrupted before the voltage E0 applied to the motor M reaches the steady battery voltage,
Under the OFF judgment by the switch detection circuit 14, first, the switch means 16a of the control voltage waveform output circuit is switched to the initial position, that is, the resistance R side, and the electric charge is discharged from the capacitor C.

By the way, OFF from the switch detection circuit 14
Since the signal is delayed by the time delay means 14c by the predetermined time Td, the energization of the motor control relays RL1 and RL2 is continued. When the capacitor C is discharged, the output voltage Ec drops exponentially due to its characteristics, and the applied voltage E0 to the motor M also drops correspondingly. It is decelerated.

After that, when the delay time Td by the time delay means 14c elapses and the corresponding relay contacts RL1a, RL2a are switched with the energization of the motor control relays RL1, RL2, the voltage E0 applied to the motor M disappears. Accordingly, the motor is stopped from the decelerating state.

That is, in such a configuration, the delay time Td by the time delay means 14c becomes the stop control time for the motor M, the motor is decelerated and driven for a corresponding time, and the motor decelerates from the decelerated state after a lapse of time. Shock when the motor is stopped can be reduced sufficiently. Therefore, a so-called soft stop that does not give a seated person an uncomfortable feeling or anxiety when the motor M is stopped can be surely executed.

As can be seen from the portion a of FIG. 3, the seat 18 moves at a low speed under the low speed drive of the motor M before the capacitor C becomes saturated,
Before the voltage E0 applied to the motor M reaches the steady voltage of the battery, the movement of the seat within a short distance, that is, the fine adjustment of the seat is facilitated by the power seat motor control device 10 of the present invention.

Further, as shown in part b of FIG. 3, when the operation switch 12 is turned on to start the motor M at a low speed, and the voltage E0 applied to the motor is raised to the steady voltage of the battery, the motor is turned on. Steady drive under steady voltage,
That is, it is driven at high speed. The time until the voltage E0 applied to the motor M reaches the steady-state voltage of the battery, that is, the start control time Tc is appropriately set to, for example, 300 to 1500 ms.

Then, for example, the seat 18 to the target position
When the operation switch 12 is turned off due to the arrival of the motor, the motor M is decelerated and driven based on the output waveform when the capacitor C is discharged, and after the delay time Td by the time delay means 14c has elapsed, the motor is stopped from the decelerated state. It That is, even when the motor M is driven in a range exceeding the start control time Tc, that is, when the seat 18 is moved, soft start and soft stop of the motor are sufficiently possible.

Further, when the motor M is driven in a range exceeding the start control time Tc, the motor is driven at high speed, so that the seat 18 moves at high speed. That is, even if the moving distance of the seat 18 is long, the seat can be moved quickly, and thus the coarse adjustment of the seat position can be easily performed.

Therefore, in the power seat motor control method of the present invention, the soft start and soft stop of the motor can be obtained at any distance regardless of the drive time of the motor M, that is, the moving distance of the seat 18. Further, it is possible to surely prevent the seated person from feeling uncomfortable and anxious, and prevent the posture from collapsing, and the comfort of the seated person is sufficiently improved.

The soft start and soft stop of the motor M gives the seat 18 a high-class feeling as a whole, so that a high-class feeling in addition to the maintenance of comfort can be sufficiently obtained in the power seat.

Further, according to the power seat motor control device 10 of the present invention, the motor control method described above can be properly executed despite the simple structure, and the shock at the time of starting and stopping the motor M can be suppressed. The soft start and soft stop that have been performed can be reliably obtained. Therefore, the comfort of the seated person is sufficiently improved, and the high-quality feeling of the seat 18 is surely obtained.

In the embodiment, as the seating posture control device for the power seat, the seat slide device 20 having the movable member as the seat 18 is illustrated, but the seating posture control device is not limited to this, and another seating posture control device, For example, the present invention may be applied to a reclining device, a seat lifter, or the like.

Further, the embodiment is embodied as a motor control device for a power seat of an automobile. However, since it is sufficient if the seat is capable of adjusting the position of the movable member of the seating posture control device by the drive control of the motor M, the seat is not limited to a power seat of an automobile, and for example, a seat of a train, an airplane, a ship or the like, The present invention can be applied to a sheet for hairdressing and the like.

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.

[0050]

As described above, according to the power seat motor control method of the present invention, the soft start and soft stop of the motor can be obtained at any moving distance of the movable member. It is possible to reliably prevent discomfort, anxiety, and posture collapse, and the comfort of the seated person is sufficiently improved.

When the operation switch is operated for a short period of time, the motor is driven at a low speed, and when the operation switch is operated for a long period of time, the motor is driven at a high speed, so that the position of the movable member is finely adjusted. The coarse adjustment can be easily performed.

Furthermore, the soft start and soft stop of the motor give the seat a high-class feeling as a whole, so that a high-class feeling in addition to the maintenance of comfort can be sufficiently obtained in the power seat.

Further, according to the power seat motor control apparatus of the present invention, the motor control method described above can be appropriately executed despite the simple structure, and the shock at the time of starting and stopping the motor can be suppressed. A soft start and soft stop can be reliably obtained. Therefore, the comfort of the seated person is sufficiently improved, and a high-quality feeling of the seat is surely obtained.

[Brief description of drawings]

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

FIG. 2 is a schematic side view of a seat on which a seat slide device is mounted.

FIG. 3 is a time chart according to a power seat motor control method of the present invention.

[Explanation of symbols]

 10 Motor control device for power seat 12 Operation switch 14 Switch detection circuit 14c Time delay means 16 Control voltage waveform generation circuit 22 Relay drive circuit 26 Voltage suppression circuit 28 Feedback control circuit C Capacitor

Claims (3)

[Claims] 1. A voltage applied to a motor is suppressed to a starting voltage of the motor, and a corresponding operation switch is turned on.
When the operation switch and the OFF operation are detected by the respective signals, and the ON operation of the operation switch is detected, the motor start voltage is applied by switching the corresponding relay contact of the motor control relay, and the corresponding speed is also detected. , The motor is driven at a low speed, and after the motor is started, an applied voltage that increases linearly with the charge of the capacitor is applied to the motor to increase the motor speed up to the maximum steady motor speed. When the operation switch OFF is detected, the electric charge charged in the capacitor is discharged, and the switching of the relay contact of the motor control relay is delayed by the predetermined delay time delayed by the time delay means, and the capacitor is discharged. The motor decelerates under the exponential voltage drop that accompanies the discharge of electric charge from the By switching the point, the motor control method of the power seat to stop the motor from the decelerating state. 2. A control voltage waveform generating circuit having a capacitor capable of switching between charging and discharging,
A waveform for charging, discharging, and steady state of the capacitor is generated in response to ON operation and OFF operation, and the voltage applied from the power supply to the motor is controlled in accordance with the waveform.
A power seat motor control method as described. 3. An operation switch for controlling driving of a corresponding motor, a switch detection circuit for detecting ON operation and OFF operation of the operation switch by discriminating an input signal, and only an output signal by an OFF operation of the operation switch. A time delay means for delaying for a predetermined time, a voltage suppression circuit for suppressing the voltage supplied from the power supply to reduce it to the motor's starting voltage, and a control for appropriately outputting waveforms corresponding to charging, discharging, and steady state of the capacitor Equipped with a voltage waveform generation circuit, a voltage control circuit, and a feedback control circuit that feedback-controls the voltage applied to the motor according to the output voltage from the control voltage waveform generation circuit. By applying voltage,
Starting the motor at a low speed and increasing the motor speed from the starting speed by linearly increasing the applied voltage along the waveform generated by charging the capacitor, and discharging the charge from the capacitor when the operation switch is turned off. The motor, the voltage applied to the motor is exponentially reduced to drive the motor deceleratingly, and the motor is stopped from the decelerating state under the switching of the relay contact of the motor control relay delayed by a predetermined time. Power seat motor controller.