JP2003250288A - Motor speed controller and seat device for vehicle using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify speed control computation and further enhance reliability of a motor speed controller. <P>SOLUTION: A motor speed controller comprises a first pulse generating means which generates pulses according to the number of revolutions of a first motor; a second pulse generating means which generates pulses according to the number of revolutions of a second motor; and a second motor power controlling means which increases power supplied to the second motor by K1 from the initial value thereof each time a pulse signal is inputted from the first pulse generating means, and reduces the power by K2 each time a pulse signal is inputted from the second pulse generating means. It is assumed that the ratio of the number of revolutions of the first motor to that of the second motor is set to N1:N2 and the numbers of pulses generated per unit number of motor revolutions of the first pulse generating means and the second pulse generating means are respectively set to P1 and P2. The relation expressed as N1×P1×K1=N2×P2×K2 holds between the power K1 and the power K2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control device for a plurality of motors and a vehicle seat device using the device.

[0002]

2. Description of the Related Art Using two motors as drive sources, a seat body for a vehicle is slid in the front-rear direction of the vehicle and horizontally rotated, whereby a "seat position" in which the seat body faces the front of the vehicle. There is known a vehicle seat device with a slide and rotation mechanism that can be moved to and from a "boarding / alighting position" in which a vehicle is located at a position in front of a seating position and that faces an entrance / exit of a vehicle. In this vehicle seat device with a slide and rotation mechanism, in order to keep the movement trajectory of the seat body constant, the slide motor (first motor) and the rotation motor (first motor) are moved while the seat body is moving. The motor speed control is performed so that the rotation speed ratio of the two motors) becomes substantially constant.

The speed control of the first motor and the second motor is performed by the control device 150 shown in FIG. Control device 1
Reference numeral 50 cumulatively calculates the number of pulses generated according to the rotation speed of the first motor to obtain the slide position of the seat body, and further cumulatively calculates the number of pulses generated according to the rotation speed of the second motor to calculate the seat body. Is calculated, whether the rotational position with respect to the slide position is proper or not is calculated, and the rotational speeds of the first motor and the second motor are controlled based on the result.

[0004]

However, in the control device 150 described above, the speed control calculation is complicated, and since it is necessary to store the data in which the cumulative number of pulses is calculated, it is necessary to store the data during the operation of the seat body. If troubles such as the above occur and the data obtained by cumulatively calculating the number of pulses is lost, speed control cannot be continued even if the power is turned on. The present invention has been made in view of the above problems, and an object of the present invention is to provide a speed control device for a motor, in which control calculation is simple and highly reliable.

[0005]

The above-mentioned problems can be solved by the inventions of the respective claims. The invention of claim 1 is the first
First pulse generating means for generating a pulse according to the rotation speed of the motor, second pulse generating means for generating a pulse according to the rotation speed of the second motor, and an initial value of electric power supplied to the second motor A second motor power control means for increasing the power by K1 each time a pulse signal is input from the first pulse generation means and decreasing the power by K2 for each pulse signal input from the second pulse generation means. Have,
The ratio of the rotation speeds of the first motor and the second motor is N1: N2.
When the number of pulses generated by the first pulse generating means and the second pulse generating means per motor unit speed is set to P1 and P2, respectively, the electric power K1
And the power K2, N1 × P1 × K1 = N2 × P2
It is characterized in that the relationship of × K2 is established.

According to the present invention, the electric power W supplied to the second motor is W = [initial value] + [number of pulse inputs from the first pulse generating means] × K1− [pulse input from the second pulse generating means] The number] × K2. Furthermore, the [number of pulse inputs from the first pulse generating means] is the actual rotation speed N1t (average value) × P1 × predetermined time T of the first motor, and the [number of pulse inputs from the second pulse generating means] is , The actual rotation speed N2t (average value) × P2 × predetermined time T of the second motor. Here, N1 × P1 × K1 = N2 × P
Since the relationship of 2 × K2 is established, if the rotation speeds of the first motor and the second motor are constant, the ratio between the rotation speed of the first motor and the rotation speed of the second motor is held at N1: N2. Therefore, [the number of pulse inputs from the first pulse generating means] × K1 = [the number of pulse inputs from the second pulse generating means] × K2, and the electric power W supplied to the second motor is
It becomes equal to the initial value. However, when the rotation speed of the first motor decreases or the rotation speed of the second motor increases, the ratio of the rotation speed of the second motor to the rotation speed of the first motor increases from the predetermined value (N2 / N1). Then, [first
The number of pulse inputs from the pulse generating means] × K1 <[the number of pulse inputs from the second pulse generating means] × K2, and the second
The electric power W supplied to the motor decreases from the initial value. As a result, the rotation speed of the second motor decreases, and the ratio of the rotation speed of the second motor to the rotation speed of the first motor is controlled to converge to a constant value (N2 / N1). When the rotation speed of the first motor increases or the rotation speed of the second motor decreases, the ratio of the rotation speed of the second motor to the rotation speed of the first motor becomes a predetermined value (N2 / N).
1) to decrease [the number of pulse inputs from the first pulse generating means] × K1> [the number of pulse inputs from the second pulse generating means] × K2, and the electric power W supplied to the second motor is
Increase from the initial value. As a result, the rotation speed of the second motor increases, and the ratio between the rotation speed of the second motor and the rotation speed of the first motor is controlled to converge to a constant value (N2 / N1).

Thus, the first pulse generating means and the second pulse generating means
Each time the pulse signal from the pulse generating means is input to the second motor power control means, the power supplied to the second motor is increased or decreased to keep the ratio of the rotation speed of the second motor to the rotation speed of the first motor constant. Because of the control method, there is no need to cumulatively calculate the number of pulses generated by the first pulse generating means and the second pulse generating means or calculate whether the number of pulses is appropriate as in the conventional method. Calculation becomes easy. Further, since the number of pulses is not cumulatively calculated, even if a trouble such as power-off occurs during the operation of the first and second motors, the speed control can be continued by turning on the power. That is, the reliability of the second motor power control means is increased.

Further, when the time from the first pulse generated by the first pulse generating means to the next pulse is shorter than the set time, the power supplied to the first motor is reduced. If the time from the previous pulse to the next pulse is longer than the set time, the first motor power control means for increasing the power supplied to the first motor is provided. That is, the first motor power control means can adjust the power supplied to the first motor so that the rotation speed of the first motor approaches the set rotation speed, and the first motor caused by load fluctuation or the like. It is possible to suppress the change in the rotation speed.

Further, as described in claim 3, when the motor speed control device according to claim 1 or 2 is used in a vehicle seat device, the movement locus of the seat body is simple. Can be constant.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a motor speed control device according to a first embodiment of the present invention and a vehicle seat device using the device will be described with reference to FIGS. The vehicle seat device according to the present embodiment uses two motors as drive sources, and rotates the seat body in the horizontal direction while sliding the seat body in the vehicle front-rear direction, so that the seat body faces the vehicle front "seating position". And a “front and rear position” of the vehicle, which is located in front of the seated position and faces the entrance / exit of the vehicle. The rotation speeds of these motors are controlled by the speed control device. Here, FIGS. 1 to 3 are flowcharts showing a speed control method of the motor speed control device, and FIGS. 4 and 5 show electric power (PWM) supplied to the second motor.
6 is a graph showing an example of changes in output value). FIG. 6 is a block diagram of a motor speed control device, and FIG. 7 is an exploded perspective view of a vehicle seat device.

As shown in FIG. 7, the vehicle seat device 1 is provided with a slide support base 10 which is horizontally fixed to a floor portion (not shown) of a vehicle compartment, and on the slide support base 10. A slide table 40 is installed via a slide mechanism 20 so as to be slidable in the front-rear direction of the vehicle. A seat frame 3 is installed on the slide table 40 via a rotating mechanism 50, and the seat body 2 is placed on the seat frame 3.

The slide mechanism 20 includes a slide table 4
0 is composed of a pair of left and right holding mechanisms 22 for holding the slide table 10 so as to be movable in the front-rear direction of the vehicle, and a moving mechanism 30 for moving the slide table 40 with respect to the slide table 10. There is. The holding mechanism 22 includes a rail-shaped fixed-side holding member 24 extending in the vehicle front-rear direction and a movable-side holding member 26 slidable along the fixed-side holding member 24. 24 are fixed to both ends of the slide support 10.

The left and right moving side holding members 26 are fixed to the lower surface of the slide table 40 while being sandwiched by the left and right fixed side holding members 24 from both sides in the width direction. The inner side surface of the fixed side holding member 24 and the outer side surface of the movable side holding member 26 face each other, and longitudinally extending V-shaped grooves 24a and 26a are formed on the inner side surface and the outer side surface. A large number of steel balls (not shown) are fitted between the V-shaped grooves 24a and 26a. As a result, the movable side holding member 26 is held so as to be slidable in the front-rear direction with respect to the fixed side holding member 24, but not vertically movable.

The moving mechanism 30 comprises a screw shaft 31 extending in the vehicle front-rear direction, a slide nut 33 screwed onto the screw shaft 31, and a first motor 35 for rotating the screw shaft 31 in the forward or reverse direction about its axis. Has been done. The screw shaft 31 is
The bearing member 32 is rotatably supported by the bearing member 32, and the bearing member 32 is fixed to the floor of the vehicle compartment.
A power transmission member (not shown) that transmits the rotational force of the first motor 35 to the screw shaft 31 is provided inside the bearing member 32. A bracket 33b is fixed to the upper portion of the slide nut 33, and the bracket 33b is connected to the lower surface of the slide table 40.

With this structure, when the first motor 35 is driven and the screw shaft 31 rotates forward or backward, the slide nut 33 moves forward or backward along the screw shaft 31 by the action of the screw. As a result, the slide nut 33
The slide table 40 coupled to the slide support 40 via the bracket 33b moves in the vehicle front-rear direction with respect to the slide support 33. The first motor 35 has P1 per unit rotation speed of the first motor 35.
Encoder 35e for generating individual pulses (see FIG. 6)
Is provided, and the output of the encoder 35e is transmitted to the control device 60. That is, the encoder 35e corresponds to the first pulse generating means of the present invention.

The rotating mechanism 50 installed on the slide table 40 includes a rotating disk 52. The turntable 52 is
An outer ring 52r having a gear 52w on the outer periphery and the outer ring 52r
The inner ring 52e is housed inside r, and the outer ring 52r and the inner ring 52e are rotatably held relative to each other. The outer ring 52r of the turntable 52 is fixed to the upper surface of the slide table 40, and the inner ring 52e is fixed to the lower surface of the seat frame 3. Further, a drive gear 54 that meshes with the gear 52w of the outer ring 52r is horizontally rotatably mounted on the lower surface of the seat frame 3, and the second motor 56 is attached to the drive gear 54 by the power transmission member 56c (FIG. 6). Connected).

With this structure, when the second motor 56 is driven and the drive gear 54 rotates normally or reversely with respect to the gear 52w of the outer ring 52r, the inner ring 52e is fixed to the slide table 40 to which the outer ring 52r is fixed. The seat frame 3 and the seat body 2 that are being rotated rotate in the horizontal direction. The second motor 56 has an encoder 5 for generating P2 pulses per unit rotation speed of the second motor 56.
6e (see FIG. 6) is provided and its encoder 5
The output of 6e is transmitted to the control device 60. That is, the encoder 56e corresponds to the second pulse generating means of the present invention.

The controller 60 controls the rotation speed of the first motor 35, which is the drive source of the slide mechanism 20, and the rotation speed of the second motor 56, which is the drive source of the rotation mechanism 50.
That is, the control device 60 corresponds to the first motor power control means and the second power power control means of the present invention. In addition, the control device 60
The encoders 35e, 56e and the like correspond to the motor speed control device of the present invention.

Next, a speed control method for the first motor 35 and the second motor 56 will be described with reference to the flow charts of FIGS. 1 to 3. Here, each processing shown in the flowchart is executed by a CPU (not shown) in the control device 60. First, when an operation switch (not shown) is turned on (step 101 in FIG. 1), the controller 60
From the above, electric power (initial value W10) is supplied to the first motor 35, and the first motor 35 is driven (step 102).
Here, the initial value W10 is a theoretical electric power value required to rotate the first motor 35 at a preset rotation speed N1 (hereinafter, referred to as a set rotation speed N1).

Further, electric power (initial value W20) is supplied from the control device 60 to the second motor 56, and the second motor 56 is driven (step 103). Here, the initial value W20
Is a theoretical electric power value required to rotate the second motor 56 at a preset rotation speed N2 (hereinafter, referred to as a set rotation speed N2). The following description will be given assuming that the actual rotation speed of the first motor 35 is N1t and the actual rotation speed of the second motor 56 is N2t. The electric power supplied to the first motor 35 and the second motor 56 is controlled by the PWM control method. The PWM control method is a method in which the width of the pulse that is turned on is changed to control the power supplied to the first motor 35.

The speed control of the first motor 35 is performed based on the processing of steps 111 to 116 in FIG. The speed control of the first motor 35 is performed after a predetermined time has elapsed since the operation switch was turned on.
First, the time Ts between the pulse signals input from the encoder 35e of the first motor 35 to the control device 60, that is, the time T from the previous pulse signal to the pulse signal input this time.
s is measured (step 111). Next, the measurement time T
s is compared with the set time T0 (step 112).
Here, the set time T0 is the time between pulse signals when the first motor 35 is rotating at the set rotation speed N1.

When the measurement time Ts is longer than the set time T0, that is, when the rotation speed of the first motor 35 is lower than the set rotation speed N1 (step 114 YES), the PWM output value of the first motor 35 is kept constant. The quantity H is increased (step 115). As a result, the rotation speed of the first motor 35 increases, and the rotation speed of the first motor 35 approaches the set rotation speed N1.

When the measurement time Ts is shorter than the set time T0, that is, when the rotation speed of the first motor 35 is higher than the set rotation speed N1 (step 114 N
O), the PWM output value of the first motor 35 is decreased by a fixed amount H (step 116). As a result, the rotation speed of the first motor 35 decreases, and the rotation speed of the first motor 35 approaches the set rotation speed N1. in this way,
By repeatedly performing the processing from step 111 to step 116 while the first motor 35 is being driven,
The speed control of the first motor 35 is performed so that the rotation speed of the first motor 35 is maintained at the set rotation speed N1.

Next, speed control of the second motor 56 will be described with reference to FIGS. The speed control of the second motor 56 is also performed after a predetermined time has elapsed after the operation switch was turned on. After starting the speed control, the first motor 3
When the first pulse signal is input from the encoder 35e of No. 5 to the control device 60 (YES in step 121), the second
PWM output value S (0) of the motor 56 (= initial value W20)
Is added with the electric power K1 (step 122). here,
Since the pulse signal is the first pulse signal, n is 1
Is set to. Therefore, the PWM output value S (1) of the second motor 56 at this time is equal to the initial value W20 + K1.

Next, the encoder 35e of the first motor 35
When the second pulse signal is input from the controller 60 to the controller 60 (YES in step 121), the PWM of the second motor 56 is performed.
The electric power K1 is added to the output value S (1) (step 12).
2). Therefore, the PWM output value S (2) = S (1) + K1 of the second motor 56 at this time. The PWM output value S (2) of the second motor 56 is the initial value W20 + 2 ×
It can be represented by K1.

Next, the encoder 56e of the second motor 56
When the third pulse signal is input from the controller 60 to the controller 60 (YES in step 123), the PWM of the second motor 56 is performed.
The electric power K2 is subtracted from the output value S (2) (step 1
24). Therefore, the PWM output value S of the second motor 56
(3) = S (2) -K2. Here, the PWM output value S (3) can be represented by an initial value W20 + 2 × K1-K2. Therefore, in general, the second motor 56
The PWM output value S (n) of is the initial value W20 + [the number of pulse signal inputs of the first motor 35] × K1- [second motor 5
6 pulse signal input number] × K2 ...

Here, the following relationship is established between the power K1 added by the input of the pulse signal of the first motor and the power K2 subtracted by the input of the pulse signal of the second motor. It has been established. That is, N1 × P1 × K1 = N2
× P2 × K2 ... As described above, N1 is the set rotation speed of the first motor 35, and N2 is the set rotation speed of the second motor 56. P1 is the number of pulse signals per unit rotation speed of the first motor 35, and P2 is the number of pulse signals per unit rotation speed of the second motor 56. Therefore, if the first motor 35 and the second motor 56 are rotating at the set rotation speeds N1 and N2 for the predetermined time T, respectively, [the number of pulse signal inputs of the first motor 35] = N1 ×
P1 × T ... Equation, and [number of pulse signal inputs to the second motor 56] = N2 × P2 × T.

Therefore, by substituting the equation, the equation, and the equation into the above equation, the PWM output value S of the second motor 56
(N) = initial value W20. As a result, the rotation speed of the second motor 56 is maintained at the set rotation speed N2. However, for example, when the rotation speed N1t of the first motor 35 becomes lower than the set rotation speed N1, the [number of pulse signal inputs of the first motor 35] becomes smaller than that in the case where the rotation speed N1 is set. In [First Motor 3
5 pulse signal input number] × K1 is [second motor 56
Pulse signal input number] x K2.

That is, if [the number of pulse signal inputs of the first motor 35] × K1− [the number of pulse signal inputs of the second motor 56] × K2 = α, the PWM output value S (n) of the second motor 56 is obtained. Is represented by S (n) = initial value W20−α. Thus, the PWM output value S of the second motor 56
Since (n) is smaller than the initial value W20 by α, the second
The rotation speed N2t of the motor 56 also decreases from the set rotation speed N2.

On the contrary, when the rotation speed N1t of the first motor 35 increases from the set rotation speed N1, the [number of pulse signal inputs of the first motor 35] becomes larger than that in the case where the rotation is performed at the set rotation speed N1. In the equation, [the number of pulse signal inputs of the first motor 35] × K1 is [second motor 5
6 pulse signal input number] × K2. That is, [the number of pulse signal inputs of the first motor 35] × K1−
If [the number of pulse signal inputs of the second motor 56] × K2 = β, the PWM output value S (n) of the second motor 56 = initial value W20 + β.

As described above, since the PWM output value S (n) of the second motor 56 becomes larger than the initial value W20 by β,
The rotation speed N2t of the second motor 56 increases from the set rotation speed N2. Thus, the rotation speed N of the first motor 35
The rotation speed N2t of the second motor 56 corresponding to the increase or decrease of 1t
Is increased or decreased, the ratio of the rotation speed N2t of the second motor 56 to the rotation speed N1t of the first motor 35 (N2t /
N1t) is held at a substantially constant value (N2 / N1).

Next, referring to FIGS. 4 and 5, the PWM output value S of the second motor 56 during speed control of the second motor 56 will be described.
The state of change in (n) will be specifically described. Here, in the graphs of FIGS. 4 and 5, N1: N2 = 2: 1 and P1 = P
2, initial value W20 = 100, K1 = 1, K2 = K1
It was created under the condition of × (N1 · P1 ÷ N2 · P2) = 2. The initial values W20 = 100, K1 = 1 and K2 = 2 are relative values (no unit). In addition, the horizontal axis L in FIGS. 4 and 5 is a time axis, and 1 shown below the horizontal axis L.
The numbers 20 to 21 to 40 represent the number of times of program processing for speed control of the second motor (see FIG. 3). further,
The bar graph represents the input timing (one example) of the pulse signals (black ... First motor, white ... Second motor).

That is, at the time of the first program processing (L = 1
4), the first pulse signal (n = 1) is input from the encoder 35e of the first motor 35,
PWM output value S (1) of motor 56 = initial value W20 + K
1 = 100 + 1 = 101. At the time of the second program processing (L = 2), since the pulse signal is not input,
The PWM output value of the second motor 56 is held at S (1) = 101. At the time of the third program processing (L = 3),
Since the second pulse signal (n = 2) is input from the encoder 35e of the first motor 35, the P of the second motor 56 is
WM output value S (2) = S (1) + K1 = 101 + 1 = 1
It becomes 02.

At the time of the fourth program processing (L = 4), the third pulse signal (n = 3) is input from the encoder 56e of the second motor 56, so the second motor 56
PWM output value S (3) = S (2) -K2 = 102-2
= 100. In this way, if one pulse signal of the second motor 56 is input to two pulse signals of the first motor 35 within the predetermined time, the PWM output value S (n) of the second motor 56 is the initial value. Converge to 100. That is, if the first motor 35 is rotating at the set rotation speed N1, the speed of the second motor 56 is also controlled to rotate at the set rotation speed N2 (= N1 / 2).

However, for example, during the eighth program processing (L = 8) to the twelfth program processing (L = 1)
As shown in 2), the rotation speed N1t of the first motor 35 increases within a predetermined time (L = 8 to L = 12), and the rotation speed N1t of the first motor 35 is higher than that at the set rotation speed N1. When the number of pulse signal inputs of the first motor 35 increases, the second motor 35
The PWM output values S (9) to (12) of the motor 56 increase. As a result, the rotation speed N2t of the second motor 56 increases following the rotation speed of the first motor 35, and the rotation speed ratio of the second motor 56 to the first motor 35 (N2t
/ N1t) is held at a substantially constant value (N2 / N1).

Further, for example, during the 14th program processing (L = 14) to the 18th program processing (L = 1
As shown in 8), the rotation speed N1t of the first motor 35 decreases within a predetermined time (L = 14 to L = 18) and the first motor 35 rotates at the set rotation speed N1.
When the number of pulse signal inputs of the first motor 35 decreases, the PWM output values S (14) to (18) of the second motor 56 decrease. Accordingly, the rotation speed N2 of the second motor 56
t decreases following the rotation speed N1t of the first motor 35, and the rotation speed ratio (N2t / N1t) of the second motor 56 to the first motor 35 is maintained at a substantially constant value (N2 / N1).

Next, the operation of the vehicle seat device 1 will be briefly described. First, when the operation switch is turned on while the seat body 2 is in the "seated position" facing the front of the vehicle, the first motor 35 of the slide mechanism 20 is driven in the forward direction, and the second motor 56 of the rotating mechanism 50 is further driven. It is driven forward. As a result, the slide mechanism 40 causes the slide table 40, the rotation mechanism 50, and the seat body 2 to move forward with respect to the slide support base 10, and the rotation mechanism 50 causes the seat body 2 to move leftward with respect to the slide table 40. Rotate horizontally.

At this time, the load applied to the first motor 35 of the slide mechanism 20 changes depending on the place where the vehicle is parked. For example, when the vehicle is parked such that the front side of the vehicle becomes higher, the load applied to the first motor 35 is greater than when the vehicle is parked horizontally. Therefore, the rotation speed of the first motor 35 becomes lower than the set rotation speed N1, and the sliding speed of the seat body 2 and the like decreases. At this time, since the speed control program (see FIG. 3) of the second motor 56 operates, when the rotation speed of the first motor 35 decreases, the PWM output value of the second motor 56 decreases and the rotation speed of the second motor 56 decreases. Also decreases.

That is, the rotation speed of the second motor 56 decreases following the rotation speed of the first motor 35,
To the rotation speed ratio of the second motor 56 (N2t / N1
t) is maintained at a substantially constant value (N2 / N1). Therefore, as the sliding speed of the seat body 2 or the like decreases, the rotation speed of the seat body 2 also decreases, and the slide position and the rotation position of the seat body 2 correspond. Further, since the speed control program of the first motor 35 also works at the same time,
When the rotation speed of the first motor 35 becomes lower than the set rotation speed N1, the PWM output value of the first motor 35 increases and
The rotation speed N1t of the motor 35 increases to increase the set rotation speed N.
It will converge to 1.

In this way, the seat body 2 and the like slide to the forward limit position, and the seat body 2 moves to the left by about 90 °.
At the horizontally rotated position, the forward limit limit SW, the leftward limit limit SW, and the like (not shown) operate, and the first motor 35 and the second motor 56 stop. This position is the "loading / unloading position", and the seat body 2 is held in a state of facing the loading / unloading direction (left direction) of the vehicle side portion.

To return the seat body 2 from the "riding position" to the "seating position", the first motor 35 is pressed by the operation switch.
And the second motor 56 are reversely driven to move the slide table 40, the rotation mechanism 50 and the seat body 2 backward with respect to the slide support base 10, and the seat body 2 is horizontally rotated rightward with respect to the slide table 40. . At this time, as described above, the speed control program (see FIG. 3) of the second motor 56 operates, so that the rotation speed of the second motor 56 is controlled so as to follow the change in the rotation speed of the first motor 35. The rotation speed ratio (N2t / N1t) of the second motor 56 to the one motor 35 is a substantially constant value (N2 /
N1). As a result, the sliding position and the rotating position of the seat body 2 correspond to each other. Also,
By the action of the speed control program of the first motor 35, the rotation speed N1t of the first motor 35 is controlled so as to converge to the set rotation speed N1. When the seat body 2 is returned to the “seating position”, the backward limit limit SW, the rightward rotation limit limit SW, etc. operate, and the first motor 35 and the second motor 56 stop.

As described above, the vehicle seat device 1 described above.
In the motor speed control device in the above, in order to control the ratio of the rotation speed of the second motor 56 to the rotation speed of the first motor 35 to a constant value, the first pulse generation means (encoder 35e) and the second pulse generation means (encoder). 56e)
Each time the pulse signal from the controller is input to the control device 60, the PWM output value of the second motor 56 is only increased or decreased by a fixed amount.
It is not necessary to cumulatively calculate the number of pulses generated by the pulse generating means or to calculate whether the number of pulses is proper. This simplifies speed control calculations and
It is not necessary to store the data that cumulatively calculates the number of pulses,
Even if a trouble such as power OFF occurs during operation of the first and second motors, speed control can be continued by turning ON the power.
That is, the reliability of the second motor power control means is increased.

In the second motor speed control method in this embodiment, N1: N2 = 2: 1, P1 = P2, K
The case where 1 = 1 is set has been described as an example, but N1, N2,
P1, P2, K1 and the like can be set to arbitrary values.

[0044]

According to the present invention, the speed control calculation is simplified and the reliability of the device is increased.

[Brief description of drawings]

FIG. 1 is a flowchart showing a speed control method of a motor speed control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a speed control method for a first motor.

FIG. 3 is a flowchart showing a speed control method for a second motor.

FIG. 4 is a graph showing changes in electric power (PWM output value) supplied to a second motor.

FIG. 5 is a graph showing changes in electric power (PWM output value) supplied to the second motor.

FIG. 6 is a block diagram of a motor speed control device.

FIG. 7 is an exploded perspective view of a vehicle seat device.

FIG. 8 is a block diagram of a conventional motor speed control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vehicle seat device 2 Seat body 20 Sliding mechanism 35 1st motor 35e Encoder (1st pulse generating means) 50 Rotating mechanism 56 2nd motor 56e Encoder (2nd pulse generating means) 60 Control device (1st motor power control means) , Second motor power control means) K1 power increase amount K2 power decrease amount P1 pulse generation number per unit rotation number of the first motor P2 pulse generation number per unit rotation number of the second motor N1 set rotation speed of the first motor N2 second motor set speed

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3B087 AA02                 5H572 AA03 AA20 BB07 CC04 DD01                       EE04 EE07 HC07 JJ03 JJ13                       KK05 LL07 PP01

Claims (3)

[Claims] 1. A first pulse generating means for generating a pulse according to a rotation speed of a first motor, a second pulse generating means for generating a pulse according to a rotation speed of a second motor, and a second motor. With respect to the initial value of the electric power, the electric power is increased by K1 every time the pulse signal is inputted from the first pulse generating means, and the electric power is decreased by K2 every time the pulse signal is inputted from the second pulse generating means. A two-motor power control means, and the ratio of the rotation speeds of the first motor and the second motor is N1: N2.
When the number of pulses generated by the first pulse generating means and the second pulse generating means per motor unit speed is set to P1 and P2, respectively, the electric power K1
And the power K2, N1 × P1 × K1 = N2 × P2
A motor speed control device characterized in that a relationship of × K2 is established. 2. The motor speed control device according to claim 1, wherein when the time from the previous pulse generated by the first pulse generating means to the next pulse is shorter than the set time, the first motor If the time from the previous pulse to the next pulse is longer than the set time, decrease the power supplied to
A motor speed control device comprising first motor power control means for increasing power supplied to the motor. 3. A second motor used as a drive source of a rotating mechanism for rotating the seat body substantially horizontally, and a drive source of a slide mechanism for sliding the seat body together with the rotating mechanism in the front-rear direction of the vehicle. And a first motor of the sliding mechanism and a first motor of the sliding mechanism so that the seat body rotates to a riding position facing the entrance / exit of the vehicle side while the seat body slides forward from a seated position facing the front of the vehicle. It has a motor speed control device which controls the rotation speed with two motors, and the motor speed control device has a motor speed control device.
A vehicle seat device, wherein the motor speed control device described in any one of 1 to 3 is used.