JP2561779Y2 - Drive control device for motor actuator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a drive control device of a motor actuator used for an air conditioner for a vehicle.

[0002]

2. Description of the Related Art Recently, various types of doors (for example, intake doors, air mix doors,
In many cases, various outlet ports are driven to open and close by a motor actuator.

FIG. 4 is a schematic diagram showing an example of a conventional motor actuator. The motor actuator 10 includes a motor 11 for driving the door and a pattern switch 12 as a position detector for detecting position information of the door. The motor 11 is disposed in a case (not shown), and drives the door to open and close via a gear group and a link mechanism (not shown). On the other hand, the pattern switch 12 includes a conductive brush 13 that rotates in conjunction with the motor 11, a metallic main contact 14 formed in a semicircular shape that is always in contact with the brush 13, and two outer brushes. It consists of three metallic separating contacts 15 to 17 alternately arranged at intervals on a concentric circle.
Each of the 5-17 adjacent ends is arranged to simultaneously contact the brush at a predetermined wrap angle α (eg, about 1.5 °). In this case, three separate contacts 15-1
7, two stop positions B and D are set. The pattern switch 12 includes a main contact 14 and separation contacts 15 to 17.
Are housed in a case printed on a resin substrate, and the main contact 14 is usually grounded. When the brush 13 slides on the pattern with the rotation of the motor 11, the output signal S from the terminals of the separation contacts 15 to 17 is output.
Since 1 to S3 change according to the door positions A to E as shown in FIG. 5, the current position of the door can be detected from the state (code signal) of each output signal S1 to S3. Note that “L” and “H” in FIG. 5 mean that the potential is L level (low level) and H level (high level), respectively.

A method for controlling the drive of such a motor actuator is disclosed in, for example, Japanese Utility Model Application Laid-Open No. 62-155018.
No. 6,086,045. For example, assuming that the target stop position of the door is B, when the current position of the door is larger than the target position B, that is, when the door is at C to D (hereinafter, the size of the door position is defined to be larger in the order of A to E). ), Output a forward rotation signal to rotate the motor 11 forward, and when the current position of the door is smaller than the target position B, that is, when the door is at A, output a reverse rotation signal to reverse the motor 11;
Further, when the current position of the door becomes the same as the target position B, that is, when a code signal corresponding to the target position B is input, a brake signal is output and the motor 11 is braked to stop.

[0005]

However, in such a conventional drive control apparatus for a motor actuator, there is a limit to the improvement of the door stop accuracy for the following reasons. That is, as described above, the stop positions of the door (B and D in FIG. 4) correspond to the lap portions that are adjacent to each other and that the brushes 13 can simultaneously contact. In order to improve the wrap angle, the wrap angle α of the wrap portion of the pattern may be reduced. However, since the motor 11 normally rotates further by about 0.5 ° due to the inertia of the motor 11 after the brake signal is output until the motor 11 stops, if the lap angle α is too small, the brake signal May cause the brush 13 to overrun without stopping within the range of the wrap angle α at the stop position. And brush 1
When 3 is overrun, the motor 11 is energized again to return the door to the target position, and there is a possibility that the door may repeat a back and forth vibration across the target position (so-called chattering). Therefore, conventionally, the lap angle α is set relatively large (about 1.5 °) so that the door can be reliably stopped at the target position by the brake signal.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has as its object to provide a drive control device for a motor actuator that can further improve the stop accuracy of a door.

[0007]

In order to achieve the above object, the present invention provides a motor for opening and closing a door provided in an air conditioner for a vehicle, and a door position detecting device for detecting a current position of the door. Means, a door target position calculating means for calculating a target position of the door based on various input signals, and driving of the motor based on a signal from the door position detecting means and a signal from the door target position calculating means. And a motor control unit having a motor control unit for controlling the motor, wherein the position detection unit includes a brush that moves in conjunction with the motor, a main contact that is always in contact with the brush, and each end adjacent to each other. Are separated from each other so as to simultaneously contact the brush at a wrap angle smaller than the rotation angle from when a brake signal is output to the motor to when the motor stops. And the motor control means outputs a brake signal to stop the motor when the motor control unit recognizes that the current position of the door has reached the target position during operation of the motor. After that, the first inversion signal is output for a predetermined time and the second inversion signal corresponding thereto is output for a predetermined time so that the motor is inverted and stopped.

[0008]

According to the present invention, the lap angle of each of the plurality of separated contacts adjacent to each other is larger than the rotation angle from when the brake signal is output to the motor until the motor stops. Since the angle is set to a small angle, if the motor is controlled so as to stop the door within the lap angle at the target stop position, the stop accuracy of the door can be improved. In the present invention, when the motor control unit recognizes that the current position of the door has reached the target position during operation of the motor, the motor control unit first outputs a brake signal to stop the motor. At this time, the door usually overruns beyond the target stop position. Then, next, the first inversion signal is output for a predetermined time to invert the motor to return the position of the door, and then the second inversion signal is output for a predetermined time, and the motor started by the first inversion signal is output. Stop completely. Therefore, by appropriately setting the output time of each of the first inverted signal and the second inverted signal, the motor can be controlled so that the door once overrun is returned to the target stop position. Therefore, the stop accuracy of the door is further improved in combination with the reduction in the lap angle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a drive control device for a motor actuator according to an embodiment of the present invention, FIG. 2 is an operation flowchart of the embodiment, and FIG. 3 is a diagram for explaining the effects of the present invention. In FIG. 1, the same members as those in FIG. 4 are denoted by the same reference numerals.

The motor actuator 20 of the embodiment is
The basic structure of the motor actuator 10 is the same as that of the conventional motor actuator 10 shown in FIG. That is, the motor actuator 20 includes a motor 11 for driving a predetermined door (not shown) provided in an air conditioner for an automobile, and a pattern switch 12 as door position detecting means for detecting current position information of the door. It is composed of Motor 11
Is disposed in a case (not shown), and drives the door to open and close via a gear group and a link mechanism (not shown). A pattern switch 1 for detecting a door position signal
2 is a conductive brush 1 that rotates in conjunction with the motor 11
3, a metallic main contact 14 formed in a semicircular shape which is always in contact with the brush 13, and three metallic separated contacts 15 alternately arranged on the outer two concentric circles at intervals. ~ 17. In the present embodiment, the adjacent ends of the separation contacts 15 to 17 have a wrap angle β that can be in contact with the brush 13 at the same time as the rotation angle (about the rotation angle from when the brake signal is output to the motor 11 until the motor 11 stops). (0.5 °), for example, 0.5 ° or less. The lap portions B and D to which the brush 13 can simultaneously contact correspond to the stop positions of the door. Therefore, in this embodiment, two stop positions B and D are set by the three separation contacts 15 to 17. Main contact 1
4 and each of the separation contacts 15 to 17 are printed on a resin substrate. The main contact 14 is grounded. When the brush 13 slides on the pattern with the rotation of the motor 11, the output signals S from the terminals of the separation contacts 15 to 17 are output.
1 to S3 are output as code signals as shown in FIG. 5 according to the door positions A to E as described above. The code signals (S1 to S3) are input to the input / output interface 22 of the microcomputer 21, and the current position of the door is recognized by the code signals.

The input / output interface 22 of the microcomputer 21
In addition to switches 25 such as a temperature setting device for setting the temperature in the vehicle compartment, a fan switch for selecting the amount of blown air, and a mode switch for selecting the outlet mode, an inside air sensor for detecting the temperature in the vehicle compartment and an outside air sensor Various sensors 2 such as an outside air sensor for detecting the temperature of the sun and a solar radiation sensor for detecting the amount of solar radiation
6 is connected via an A / D converter 27.

The microcomputer 21 processes input signals from the pattern switch 12, switches 25, various sensors 26, etc., and processes each motor actuator (intake door actuator, air mix door actuator, mode door actuator, etc.) and a fan (not shown). motor,
An input / output interface 22 that comprehensively controls a compressor and the like, and that inputs and outputs signals to and from external devices.
And a CPU 23 for executing various arithmetic processing, and a memory 24 composed of a RAM and a ROM. The CPU 23 calculates a target position of the door based on input signals from the switches 25 and various sensors 26, and calculates an operation mode of the motor 11 based on the current position information and the target position information of the door, and calculates a motor mode to be described later. A command signal is output to the controller 28. The door target position calculation means is constituted by the CPU 23, and the motor control means is a CP.
U23 and a motor controller 28.

The motor 11 in the motor actuator 20
Is controlled by a known motor controller 28 into four modes: forward rotation, reverse rotation, stop or brake.
This motor controller 28 is connected to the input / output interface 22 of the microcomputer 21,
Upon receiving a command from the PU 23, the motor 11 outputs a forward rotation signal, a reverse rotation signal, a stop signal, or a brake signal. When a forward rotation signal is output from the motor controller 28 to the motor 11, the motor 11 rotates in the forward direction (clockwise), and the brush 13 also rotates in the forward direction, that is, in the direction from E to A in conjunction with this. When a reverse rotation signal is output to the motor 11, the motor 11 rotates in the reverse direction (counterclockwise), and in conjunction with this, the brush 13 also moves in the reverse direction, that is, from A to E.
Rotate in the direction toward. When a brake signal is output to the motor 11, that is, when both terminals of the motor 11
When the potential reaches the level, the motor 11 is in a stopped state with the brake applied.

In this embodiment, the motor actuator 20
Is continuously operated, a brake signal is output from the motor controller 28 to the motor 11 when the door reaches the target stop position and the code signal from the pattern switch 12 changes. The microcomputer 21 obtains various signals at an appropriately set sampling period, and outputs to the motor 11 accordingly.

Further, as for the control content when stopping the motor 11 at the target position, first, when a target code signal corresponding to the target position is input from the pattern switch 12 to the microcomputer 21, a brake signal is output to the motor 11.
At this time, since the wrap angle β is small as described above, the motor 11 generally overruns. Then, a first inversion signal is output next to invert the motor 11, and a second inversion signal corresponding to the first inversion signal is output to surely stop the motor. The output time of each of the first inverted signal and the second inverted signal is determined based on the signal processing speed of the microcomputer 21, the operation speed of the motor 11, the size of the lap angle β of the lap portion of the pattern switch 12, and the like. Is set to an appropriate time in advance so that the target can be returned to the target position and stopped reliably. In this embodiment,
Each output time of the first inverted signal and the second inverted signal is set to, for example, 10 milliseconds (msec).

Next, the specific operation of the drive control device for the motor actuator configured as described above will be described with reference to FIG.
This will be described according to the flowchart of FIG. First, the microcomputer 21
CPU 23 reads input signals from various sensors 26 and switches 25 (S1), and calculates a target position T of the door (S2). In the present embodiment, T is B or D. Here, a case where T = B will be described as an example.

Next, the output signals S1 to S3 from the respective terminals of the pattern switch 12, that is, the code signals are read (S3), and the present position P of the door is calculated and recognized (S3).
4). The calculation at this time is performed according to the code signal table of FIG.

Then, a difference (PT) between the current position P of the door and the target position T is determined (S5). As described above, the magnitude relationship between the door positions is defined to increase in the order of A to E.

In step 5, when PT is positive, that is, when P> T (specifically, when the door is at the positions C to E), the CPU 23 moves the door to the direction B. An instruction is issued to the motor controller 28, and the motor 11 is caused to output a forward rotation signal to rotate the motor 11 forward (S6). Thereafter, the process returns to step 3, and the above operation is repeated until PT = 0 in step 5.

When PT is negative in step 5, that is, when P <T (specifically, when the door is at the position of A), the motor controller is operated to move the door toward B. In step S7, the motor 11 outputs a reverse rotation signal to rotate the motor 11 reversely. Then, the process returns to step 3, and the above operation is repeated until PT = 0 in step 5.

When PT = 0 in step 5, that is, when the door reaches the target position T (= B), CP
U23 issues a command to the motor controller 28 to stop the motor 11 by applying a brake, and causes the motor 11 to output a brake signal (S8). At this time, as described above, the lap angle β of the pattern switch 12 is determined by the angle (usually about 0.5) at which the brush 13 rotates from when the brake signal is output until the motor 11 stops.
°) (less than 0.5 °), the brush 13 overruns the target position B in most cases even when the variation of each lap angle β of the pattern switch 12 is considered. Has stopped.

Then, subsequently, the difference (PT) between the current position P and the target position T of the door is determined (S9), and the first inversion signal and the second inversion signal are sequentially sent to the motor 11 by, for example, 10 mm each. Second (msec) output, the motor 11 is reversed, and the door is stopped within the target position B. Specifically, when PT is positive in step 9 (specifically, when the door is at the position C due to overrun), the door is moved to B
Is output to the motor 11 for a short time (10 msec), and the reverse rotation signal is output for a short time (1 msec).
0 msec) and output (S10, S11). When PT is negative in step 9 (specifically, when the door is at the position A due to overrun), the motor 11 is first supplied with a reverse rotation signal for a short time (in order to return the door to the position B). 10msec)
Then, a normal rotation signal is output for a short time (10 msec) (S12, S13). Then, at step 9, PT
= 0 (ie, when the door stops within the target position without overrun by the initial brake signal)
Similarly to the above control, in order to slightly return the door, an inverted signal corresponding to the previous drive signal is output for a short time (10 msec), and then an inverted signal corresponding thereto is output for a short time (10 msec) (S
14, S15).

Therefore, according to the present embodiment, the stop accuracy of the door can be remarkably improved. That is, conventionally, the wrap angle α of the pattern switch 12 is set relatively large in order to stop the brush 13 within the target code signal at the target stop position, and therefore, as shown in FIG. The hysteresis F (difference between forward rotation and reverse rotation) of the overrun of the brush 13 cannot be avoided. On the other hand, in the present embodiment, the control is performed such that the motor 11 is once stopped by the brake signal, then restarted in the opposite direction and immediately stopped. It will stop before reaching, which results in a smaller overrun. Therefore, as shown in FIG. 3B, in combination with the reduction of the wrap angle β of the pattern switch 12, the brush 1 falls within this small wrap angle β.
3 can be stopped, the hysteresis G can be set to the overrun amount, and the stop accuracy of the door can be further improved.

[0024]

As described above, according to the present invention, the stop accuracy of the door can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a drive control device of a motor actuator according to an embodiment of the present invention.

FIG. 2 is an operation flowchart of the embodiment.

FIG. 3 is a diagram for explaining the effect of the present invention.

FIG. 4 is a schematic configuration diagram illustrating an example of a conventional motor actuator.

FIG. 5 is a diagram showing a code signal output from a pattern switch.

[Description of Signs] 11 ... Motor 12 ... Pattern switch (door position detection means) 13 ... Brush 14 ... Main contact 15-17 ... Separation contact 20 ... Motor actuator 23 ... CPU (door target position calculation means, motor control means) 28 ... Motor controller (motor control means) ... Lap angle

Claims (1)

(57) [Scope of request for utility model registration] 1. A motor (11) for opening and closing a door provided in an air conditioner for a vehicle, a door position detecting means (12) for detecting a current position of the door, and various input signals. Door target position calculating means (23) for calculating the target position of the door, and driving of the motor based on a signal from the door position detecting means (12) and a signal from the door target position calculating means (23). A motor controller having motor control means (23, 28) for controlling the motor, wherein the position detecting means (12) comprises a brush (13) moving in conjunction with the motor (11), The main contact (14) that is always in contact with the brush (13), and the brush (13) has a wrap angle smaller than the rotation angle of each end adjacent to each other until the motor (11) stops after a brake signal is output to the motor (11). ) That are spaced apart from each other so that they Away contacts (15,
When the motor control means (23, 28) recognizes that the current position of the door has reached the target position during operation of the motor (11), the motor control means (23, 28) outputs a brake signal. Then, after stopping the motor (11), outputting a first inversion signal for a predetermined time and outputting a second inversion signal for this for a predetermined time in order to invert and stop the motor (11). Characteristic drive control device for motor actuator.