JPH058674A - Motor control method and motor control device for power seat - Google Patents

Abstract

PURPOSE:To sufficiently restrain shock at the time of motor starting and suspension, and thereby enhance comfort for a person on a seat by starting a motor at low speeds under applied voltage restrained by limit resistance for the specified period of time, and concurrently suspending the motor under controlled regenerated braking force while being decelerated. CONSTITUTION:Drive signals generated when a motor is driven, are detected by a detection circuit 30, and delayed signals Which are generated while being delayed by the specified period of time, and go out of existence, are formed by a delay circuit 32. In the second place, the drive signals are compared with the delayed signals by a comparison circuit 34 so as to be synthesized, and only when both the signals are generated, a specified operating signal is generated. And when no operating signal is generated, a specified limit resistor R1 is inserted into the terminal of motor winding in series. In the second place, only when the operating signal is generated, a torque switching means 16 is switched by a switching control circuit 36, so that the insertion of the limit resistor R1 at the terminal of motor winding is released.

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 turning on / off the switch means of the motor control device or switching the relay contact of the motor control relay.

Here, in the configuration using the DC motor,
Generally, regenerative braking caused by a short circuit between winding terminals of a motor is used to stop a motor, that is, a movable member such as a seat. According to such a configuration, the DC
The holding force when the motor is stopped, which is a feature of the motor, can be effectively used, and the stopped state of the motor is reliably held under regenerative braking, so that the stopping accuracy of the movable member is improved.

[0005]

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

However, in the known configuration, the start or stop of the motor is controlled by the application or interruption of the supply voltage to the motor due to the on / off of the switch means and the switching of the relay contact, so that the motor is suddenly stopped. Starting and stopping is inevitable.

In particular, 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. . When starting the motor,
The shock at the time of stopping gives discomfort and anxiety to the seated person,
This may impair the comfort of the seated person.

Here, for example, a transistor or an FET is used as a measure for suppressing a shock when the motor is started and stopped.
It is generally conceivable to control the speed of the motor by speed control means using (field effect transistor) or the like.

However, in such a speed control means, the structure is likely to be complicated, and since the transistors, FETs, etc. are expensive, the overall cost of the speed control means and the motor control device is increased.

Further, in such a speed control means, heat is generated in the transistors, FETs, etc. and switching noise is likely to occur, which may adversely affect electronic circuit elements in the vicinity, which is not preferable.

Further, such a speed control means is usually constructed so as to be applicable at the time of automatic control of a motor capable of previously recognizing the stop position of the motor. Therefore, it is difficult to apply the motor to the manual control of the motor for the seated person to arbitrarily drive and control the motor, and it is difficult to control the speed of the motor in the manual control, that is, to suppress the shock.

It is an object of the present invention to provide a power seat motor control method and a motor control device for suppressing shocks when the motor is started and stopped.

[0013]

To achieve this object, according to the power seat motor control method of the present invention, a drive signal generated when the motor is driven is detected and delayed by a predetermined time from the drive signal. It forms a delayed signal that occurs and disappears. Then, the drive signal and the delay signal are compared and combined, and the switching operation of the torque switching means is controlled by a predetermined operation signal generated only when both the drive signal and the delay signal are generated. There is.

[0014]

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 motor drive means 14, a torque switching means 16, and a switching control means 18.
And is configured to be able to drive and control the motor M by operating the operation switch.

Normally, DC geared motors can be used as the motors M, and the motors are movable members of the seating posture control device mounted on the seat 20, for example, in the seat slide device 22 as shown in FIG. It is provided as a drive source for sliding the seat itself.
It should be noted that the seat slide device 22 has a known structure, and since the structure is not the purpose of the present invention, it will not be described in detail.

As can be seen from FIGS. 1 and 3,
The winding terminal of the motor M is connected via the changeover switch means 24.
It is connected to a power source, for example, a battery 26 of an automobile, and can be driven and controlled by switching a changeover switch.

As shown in FIG. 1, as the operation switch 12, for example, an automatic return type seesaw type switch having a neutral position and a contact at two positions, which can change the driving direction of the motor M depending on the operation direction, can be used. . The operation switch 12 is formed, for example, as a manual switch capable of manually controlling the motor M.

Then, as shown in FIG.
12 is connected to the motor drive means 14. The motor driving means 14 processes the signal from the operation switch 12, for example, and switches the winding switch terminal 24 of the motor M and the changeover switch means 24 interposed between the battery (power source) 20,
The motor M is configured to be drive-controllable.

As can be seen from FIGS. 1 and 3, as the changeover switch means 24, for example, the relay contacts RL1a, RL2a of the motor control relays RL1, RL2 connected to the motor drive means 14 can be used.

For example, when the operation switch 12 is operated in any direction, a corresponding signal is output to the motor driving means 14, and either of the motor control relays RL1 and RL2 is energized by the signal processed by the motor driving means. To be done. Then, the corresponding relay contact of the relay contacts RL1a, RL2a is switched, and the motor M is driven in the corresponding direction (normal rotation,
Then, the seat 20 is slid in the front-rear direction.

The operation switch 12 is arranged at a position where a seated person can operate it, for example, on the side of the seat cushion 28 of the seat 20 as shown in FIG. However, it is sufficient if the seated person can operate the seat cushion 28.
However, the operation switch 12 may be arranged at other positions, such as the console box and the armrest of the inner wall of the door (both not shown).

The motor drive means 14 is an operation switch.
It suffices if the motor M can be driven and controlled in accordance with the operation of 12, and the configuration itself is known, and therefore will not be described in detail.

By the way, in the known configuration, for example, by switching the relay contacts RL1a, RL2a, the motor M
Since the drive is controlled, it is inevitable that a shock will occur when the motor is suddenly started and stopped under a constant battery voltage (applied voltage).

Therefore, the power seat motor control device 10 of the present invention is configured so that the torque of the motor can be switched by, for example, the torque switching means 16 interposed between the winding terminal of the motor M and the relay contact RL1a. There is.

As can be seen from FIGS. 1 and 3, the torque switching means 16 comprises a limiting resistor R1 connected in series with the winding terminal of the motor and a switching contact RL3a connected in parallel with the limiting resistor.
And are formed. Then, the torque switching means 16
Is a short circuit between the terminals of the limiting resistance R1 due to the switching contact RL3a,
By releasing the short circuit, the limiting resistor can be inserted into and released from the winding terminal of the motor M.

The limiting resistance R1 is, for example, 0.5 to 2Ω.
A general low resistance of the order of magnitude is available. Further, the switching contact RL3a of the torque switching means 16 is formed, for example, as a relay contact of the control relay RL3 connected to the switching control means 18, and the limiting resistance is changed by the switching accompanying the energization of the control relay.
The terminals of R1 are connected so as to be short-circuited.

The switching control means 18 comprises, for example, a drive signal detecting means 30, a delay circuit 32, a comparison circuit 34, and a switching control circuit 36, and the control relay RL3 is generated by the drive signal generated when the motor M is driven. The energization and deenergization, that is, the switching contact RL3a of the torque switching means can be switched and controlled.

As shown in FIG. 3, the drive signal detection circuit 30
Are diodes D1 and D2 connected to the winding terminals of the motor
And a gate circuit 38 that shapes a predetermined pulse from the terminal voltage of the detection resistor R2. In such a configuration, the battery current flowing by switching the relay contacts RL1a, RL2a is detected as the drive signal of the motor M, and the presence or absence of the drive signal is recognized and monitored by raising or lowering the terminal voltage of the detection resistor R2.

The pulse of the portion a in FIGS. 1 and 3 shaped by the drive signal detection circuit 30 is normally, as shown in FIG.
The operation switch 12 is turned on and off at substantially the same timing.

Then, as shown in FIGS. 1 and 3, the pulse from the drive signal detection circuit 30 is output to the delay circuit 32. The delay circuit 32 includes an input signal, as can be seen by comparing the pulses of the parts a and b in FIGS.
That is, the output pulse of the drive signal detection circuit 32 is appropriately processed and shaped, and the pulse delayed by the predetermined time t can be output as a delay signal. The predetermined time t is usually about 50 to 150 msec.

The delay signal shaped by the delay circuit 32 is compared with the output pulse from the drive signal detection circuit, that is, the drive signal of the motor M, by the comparison circuit 34. The pulses of the parts a, b and c in FIGS. 1 and 3 are shown in FIG.
As can be seen by comparing in, the comparison circuit 34 is
Only when both the drive signal and the delay signal are generated, the shaped predetermined pulse is output as the actuation signal.

The operation signal from the comparison circuit 34 is output to the switching control circuit 36, and the control relay RL3 is energized and deenergized under the signal appropriately processed by the switching control circuit.
That is, the switching of the switching contact RL3a of the torque switching means is controlled.

As shown in FIG. 3, in such a motor control device 10, an internal circuit power supply 39 is provided, and switching control is performed under a stable supply voltage supplied from the internal circuit power supply. Drive signal detection means 30 of means, delay circuit
32, the comparison circuit 34, and the switching control circuit 36 are operable.

For example, as can be seen from FIG. 4, in such a configuration, the pulse of the portion c in FIGS.
In other words, the control relay RL3 is activated only when the actuation signal is generated. That is, during the predetermined time t from the generation of the drive signal of the motor M to the generation of the operation signal, the limiting resistor R1 is in the state of being inserted in the winding terminal of the motor,
The motor is started at a low speed under the applied voltage suppressed by the limiting resistance.

When a predetermined time t elapses and an operation signal is generated along with the generation of the delay signal, the control relay RL3 is energized under the signal from the switching control means 18 to switch the torque switching means. The contact RL3a is switched, and the terminals of the limiting resistor R1 are short-circuited. Then, the motor is steadily driven under the steady applied voltage supplied to the motor M without passing through the limiting resistor R1, and the seat 20 is slid in the front-rear direction.

With such a configuration, the motor M is started at a low speed, so-called soft start, under the applied voltage suppressed by the limiting resistor R1, and after the elapse of the predetermined time t, the motor is normally driven. Then, the seat 10 is slid in the front-rear direction. Therefore, the shock at the time of starting the motor is sufficiently suppressed, and the comfort of the seated person is improved without giving the seated person the discomfort and anxiety caused by the shock.

Since the shock at the time of starting the motor is difficult to be transmitted to the seated person, the posture collapse of the seated person can be sufficiently suppressed. Therefore, the sitting posture is stabilized, and the comfort of the seated person is improved also from this point.

Further, after a predetermined time t has passed since the motor control relays RL1 and RL2 were energized due to the operation of the operation switch 12, the terminals of the limiting resistor R1 were short-circuited and a steady current flowed to the motor M. The motor is driven under a constant applied voltage. Therefore, the voltage loss due to the limiting resistor R1 is prevented, and the rated characteristic of the motor M is not impaired. Therefore,
Swift movement of the seat 20 can be sufficiently ensured, and speeding up of the motor M is not hindered.

Further, as shown in FIG. 4, for example, when the operating force of the operating switch 12 is released and turned off at any seat position, the corresponding relay contacts RL1a, RL2 are released.
By switching a, the current from the battery 26 is cut off and the drive signal for the motor M disappears. When the drive signal disappears, the control relay RL3 is deenergized due to the disappearance of the actuation signal accompanying the drive signal, and the limiting resistance R1 causes the winding of the motor M to rotate under the switching of the switching contact RL3a of the torque switching means. It is reinserted in series with the terminal.

As can be seen from FIGS. 1 and 3, when the relay contacts RL1a and RL2a are switched by deenergizing the motor control relays RL1 and RL2, the winding terminals of the motor M are connected to the respective relay contacts. Is short-circuited via, and regenerative braking acts on the motor. However, in the present invention, since the limiting resistance R1 in series exists at the winding end of the motor M, the limiting resistance suppresses the regenerative braking force that acts on the motor M when the winding end is short-circuited.

That is, the motor M does not stop suddenly when the operation switch 12 is turned off, but stops while decelerating under the regenerative braking force suppressed by the limiting resistance R1. Therefore, the so-called soft stop of the motor M is possible, the shock when the motor is stopped can be sufficiently suppressed, and the discomfort caused by the shock when the motor is stopped,
It does not give the seated person any anxiety.

Further, since the shock when the motor is stopped is difficult to be transmitted to the seated person, the posture collapse of the seated person can be sufficiently suppressed. Therefore, the sitting posture is stabilized, and the comfort of the seated person is improved also from this point. Especially in the driver seat, it is easy to start the vehicle immediately after setting the seat position and get off the vehicle immediately after setting the ride position, so the operation when getting on and off the vehicle does not become complicated, and the getting on and off is speeded up. .

Here, according to the present invention, the drive signal of the motor M is detected, and the insertion and the release of the limiting resistor R1 are switched based on the generation and disappearance of the drive signal. Therefore, not only during the automatic control of the motor but also during the manual control, the shock at the time of starting and stopping the motor can be sufficiently suppressed.

Further, according to the present invention, the motor drive means
A torque switching means 16 is provided by a switching control means 18 different from the 14
Since the switching control of the motor is performed, the control form of the motor does not matter, that is, the switch control without interposing the motor drive means, the motor control relay, etc., the relay control by the motor control relay, and the microcomputer control by the microcomputer.

Therefore, automatic control, manual control,
Further, the soft start and soft stop of the motor can be obtained without being limited to the control form of the motor.

According to the motor control device 10 for a power seat of the present invention, the motor control method described above can be properly performed despite the simple structure, and shocks at the time of starting and stopping the motor M can be suppressed. A soft start and a soft stop that can be performed are surely obtained. Therefore, the comfort of the seated person is sufficiently improved.

Further, except for the predetermined time t at the time of starting the motor,
Since no current flows through the limiting resistor R1, even if a small and inexpensive resistor is used as the limiting resistor, the limiting resistor does not overheat or burn. Therefore, the complication of the configuration of the motor control device 10, the increase in cost can be sufficiently prevented, and the motor control device of the present invention can also be used for a seating posture control device having a configuration that mechanically blocks the movement of the movable member. The range of use of the motor control device is sufficiently expanded.

Furthermore, without the need for microcomputer control,
Since the soft start and soft stop of the motor can be executed, it is possible to sufficiently prevent the price increase and the complication of the configuration of the motor control device 10, and also in this respect, the usage range of the motor control device is sufficiently expanded.

Reference numerals 40 and 42 in FIG. 3 indicate limit switches. Such limit switches 40, 42
Are respectively provided so that the slide limit position of the seat 20 can be detected, and the current from the battery is cut off when the seat reaches the slide limit position.

In such a configuration, the limit switch 4
Since the slide range of the seat 20 is reliably defined by 0, 42, excessive slide of the seat can be sufficiently prevented, and safety of the motor M, the seat slide device 22 and other peripheral members can be ensured.

In the embodiment, as the seating posture control device for the power seat, the seat slide device 22 in which the movable member is the seat 20 is illustrated, but the present invention is not limited to this, and other seating posture control devices, It goes without saying that the present invention can be applied to, for example, a reclining device, a seat lifter, and the like.

Further, the embodiment is embodied as a motor control device for a power seat of an automobile. However, as long as the seat is capable of adjusting the position of the movable member of the seating posture control device by drive control of the motor, the seat is not limited to a power seat of an automobile, and for example, a train, an airplane,
It can also be applied to seats for ships, etc. and seats for bean jam, hairdressing, etc.

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.

[0055]

As described above, according to the power seat motor control method of the present invention, the motor drive signal,
A predetermined actuation signal is formed by comparison and synthesis with a delay signal that occurs and disappears after a predetermined time from the drive signal. Then, when the operation signal is not generated, a predetermined limiting resistance is inserted in series with the winding terminal of the motor, and only when the operation signal is generated, the limiting resistance of the winding terminal of the motor is uninserted to reduce the motor torque. It is switching.

Therefore, the motor starts at a low speed for a predetermined time under the applied voltage suppressed by the limiting resistance, and stops while decelerating under the suppressed regenerative braking force. Shock at the time of stop is sufficiently suppressed. Therefore, the comfort of the seated person is improved without giving the seated person a feeling of discomfort or anxiety caused by a shock at the time of starting or stopping the motor.

Further, according to the power seat motor control device of the present invention, the above-mentioned motor control method can be properly executed despite the simple structure, and the software for suppressing the shock at the time of starting and stopping the motor can be realized. A start and a soft stop are surely obtained. Therefore, the comfort of the seated person is sufficiently improved.

Since the present invention can be applied to automatic control of motors, manual control, and control forms of motors, the application range of the motor control device for the power seat in the present invention is sufficiently expanded.

[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 partially broken circuit diagram of a motor control device for a power seat.

FIG. 4 is a time chart of a power seat motor control method according to the present invention.

[Explanation of symbols]

10 Power seat motor controller 12 Operation switch 14 Motor drive means 16 Torque switching means 18 Switching control means 30 Drive signal detection circuit 32 delay circuit 34 Comparison circuit 36 Switching control circuit M motor R1 limiting resistor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H02P 7/00 C 9063-5H

Claims (4)

[Claims] 1. A drive signal generated at the time of driving a motor is detected, and a delay signal that occurs and disappears after being delayed by a predetermined time from the drive signal is formed, and the drive signal and the delay signal are compared and synthesized, A predetermined actuation signal is generated only when both signals are generated, and a specified limiting resistor is inserted in series with the winding terminal of the motor when the operation signal is not generated, and only when the operation signal is generated. , A power seat motor control method for switching the motor torque by removing and inserting the limiting resistance at the winding end of the motor. 2. A drive signal generated at the time of driving a motor is detected, and a delay signal which is generated and disappears after being delayed by a predetermined time from the drive signal is formed, and the drive signal and the delay signal are compared and synthesized, A predetermined operation signal is generated only when both signals are generated, and a predetermined delay time from the generation of the drive signal of the motor to the generation of the operation signal of the motor is limited by a predetermined limit. The motor is started at a low speed under the applied voltage suppressed by the resistance, and the limiting resistor at the winding terminal of the motor is inserted and released by the generation of the operation signal after the delay time elapses. The motor is steadily driven under the supplied constant applied voltage, and the limiting signal is reinserted in series with the winding terminal of the motor due to the disappearance of the operating signal accompanying the disappearance of the drive signal. A power seat motor control method for decelerating and stopping a motor under the regenerative braking force suppressed by resistance. 3. A motor driving means for moving a movable member, an operation switch for controlling the driving of the motor, a signal from the switch means, and driving control of the motor by the switching operation of the changeover switch means. And a torque switching means for switching the torque of the motor by having a predetermined limiting resistance inserted in advance at the winding end of the motor and releasing the insertion of the limiting resistance at the winding end of the motor due to a short circuit between the terminals of the limiting resistance. And a drive signal generated at the time of driving the motor is detected, and a delay signal that occurs and disappears after being delayed by a predetermined time from the drive signal is formed, and the drive signal and the delay signal are compared and combined to obtain both signals. And a switching control means for controlling the switching operation of the torque switching means only when both are generated. Therefore, the motor control device for a power seat that is configured to be able to switch the torque of the motor. 4. The switching control means forms a drive signal detection circuit for detecting a drive signal of the motor and shaping it into a predetermined pulse, and a delay signal which is generated and disappears after a delay of a predetermined time from the drive signal, A delay circuit that shapes and outputs a delayed signal to a delay circuit, and compares and combines the drive signal and delayed signal pulses to generate a specified actuation signal only when both signals are generated. 4. The power according to claim 3, further comprising: a circuit, and a switching control circuit that switches the torque switching means only when an operation signal is generated from the comparison circuit to insert and release the limiting resistance of the winding terminal of the motor. Seat motor controller.