JPH04244901A - Target position correction device of mechanism with potentiometer - Google Patents

Abstract

PURPOSE:To enable variation of a resistance peculiar to a resistance element or according to resistance signal to be adjusted and an operation portion such as a motor to be controlled constantly and accurately by performing calibration to a resistance signal from a potentiometer. CONSTITUTION:An operation portion 3 is positioned at a starting edge position and a resistance signal for detecting the position is output from a potentiometer 4 to a microcomputer 5 and is memorized as a starting edge value Qf0. Also, the resistance signal of a terminal position is memorized as a terminal value Qf90 in a similar procedure. On the other hand, a straight line which connects Qf0 and Qf90 which are stored in a memory of the computer 5 allows a resistance signal Qi at any arbitrary intermediate position to be interpolated and to be output from the potentiometer 4 to the computer 5 as a correction resistance signal Qi'. Therefore, controlling constantly by a correction value prevents influence of variation of resistance peculiar to the potentiometer 4 or according to aging.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a target position correcting device for a mechanism with a potentiometer that corrects a target position signal input to an operating section having a potentiometer that detects an operating position and outputs a resistance value signal.

0002

2. Description of the Related Art Conventionally, as a mechanism with a potentiometer of this type, there is, for example, a damper drive mechanism for an air conditioner. This damper drive mechanism consists of a damper that can be rotated by a motor at any angle from a fully closed position of 0 degrees to a fully open position of 90 degrees, and a wiper that is fixed at right angles to the rotation axis of this damper and slides on a resistive element. a potentiometer that outputs a resistance value signal corresponding to the rotation angle, and a microcomputer that feedback controls the rotation angle of the motor based on the deviation between the resistance value signal from the potentiometer and the target rotation angle signal. There is. Then, control is performed so that the deviation is zero, that is, the actual rotation angle of the damper becomes the target rotation angle.

0003

[Problems to be Solved by the Invention] However, in the conventional damper drive mechanism described above, the resistance value signal output from the potentiometer is directly input to the microcomputer as a detected value, and therefore Variations in the resistance value due to changes directly appear in the detected value, resulting in an error between the detected value and the actual rotation angle. As a result, the motor continues to be driven even though the damper is in the fully open position, and unreasonable force is applied to the drive mechanism, or the damper opening becomes above or below a predetermined value, resulting in an excessive amount of air being supplied to the room. The drawback is that a shortage occurs, which in turn leads to an imbalance in the capacity and heat load of the air conditioner. Here, it is possible to prevent the motor from continuing to be driven with the damper in the fully open and fully open positions using a limit switch, but this would make the drive mechanism expensive and would not eliminate other drawbacks.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to calibrate the resistance value signal from the potentiometer, thereby calibrating the resistance value due to the inherent or aging of the resistance element with a simple and inexpensive configuration that does not require a limit switch or the like. To provide a target position correction device with a mechanism equipped with a potentiometer, which is not affected by variations in the output speed, outputs an appropriate target value signal to the moving parts such as a damper and a motor, and can always accurately control the moving parts. be.

[0005]

[Means for Solving the Problems] In order to achieve the above object, a target value correction device for a mechanism with a potentiometer according to the present invention includes an operating section 3 and an operating section 3, as illustrated in FIG.
a potentiometer 4 that detects the operating position of and outputs a signal θf representing a resistance value; a memory; a starting end value storage means 5 for storing an input resistance value signal as a starting end value θfo in the memory; and a starting end value storage means 5 for positioning the operating section 3 at a terminal end position at a predetermined time, and from the potentiometer 4 when the operating section 3 is located at the terminal end position. The input resistance value signal is set to the terminal value θ
The terminal value storage means 5 stores the terminal value as f90, and the target position signal θi is interpolated by a straight line connecting the starting point value θfo and the terminal value θf90 stored in the memory, and the resistance value of the potentiometer 4 of the corresponding size is determined. The present invention is characterized in that it includes an interpolation means for outputting a corrected target position signal θ'i.

[0006] Also, the operating section 3 and the potentiometer 4
, memory, start end storage means 5, end end storage means 5, and interpolation means 5, a control section 5 is provided which controls the operating section 3 based on the target position signal θi and the resistance value signal θf from the potentiometer 4. The corrected target position signal θi' may be outputted from the interpolation means 5 to the section 5.

Furthermore, the control section 5 may perform feedback control based on the target position signal .theta.i and the resistance value signal .theta.f.

[0008]

[Operation] In the first target position correction device of the present invention, the starting end value storage means 5 positions the operating section 3 at the starting end position at a predetermined time, and when the operating section 3 is located at the starting end position, the starting end value storage means 5 stores the operating section 3 at the starting end position.
The resistance value signal inputted from the potentiometer 4 that detects the position of is stored in the memory as the starting end value θfo, and the end value storage means 5 positions the operating section 3 at the end position at a predetermined time and receives the resistance value signal inputted from the potentiometer 4. The resistance value signal is stored in the memory as the terminal value θf90. On the other hand, the interpolation means 5 uses the starting point value θf stored in the memory.
The target position signal θi is interpolated by a straight line connecting o and the terminal value θf90, and outputted as a corrected target position signal θi' representing the resistance value of the potentiometer 4 of the corresponding magnitude. Therefore, the target position signal θi corresponding to an arbitrary target position between the start end position and the end position is interpolated with the actual resistance value of the potentiometer 4 of the operating unit 3 at the start end position and the end position, and the operating unit 3 is the resistance value signal that would actually be output from the potentiometer 4 when located at the position;
That is, the corrected target position signal θi' is output. Therefore, by controlling the operating section 3 with this corrected target position signal θi', the operating section 3 can be controlled to an accurate position without being affected by variations in resistance value inherent in the potentiometer 4 or due to aging. can do.

In the second target position correction device of the present invention, the corrected target position signal θi' is outputted from the interpolation means 5 to the control unit 5, and the control unit 5 outputs the corrected target position signal θi' from the potentiometer. The operating section 3 is controlled based on the resistance value signal θf. Therefore, the operating section 3 is controlled to an accurate position by the control section 5 without being affected by variations in resistance value inherent in the potentiometer 4 or due to changes over time.

In the third target position correcting device of the present invention, the control section 5 performs feedback control of the operating section 3 based on the corrected target position signal θi' and the resistance value signal θf from the potentiometer 4. Therefore, the operating section 3 can output the corrected target position signal θi without being affected by the above-mentioned variations.
' and the resistance value signal θf (θi' - θf) is controlled to an accurate position so that it becomes zero.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to illustrated embodiments. FIG. 1 shows a damper drive mechanism for an air conditioner as an example of the target position correction device of the present invention. This damper drive mechanism is operated by a motor 1 in a fully open direction of 90 degrees.
It has a damper 3 as an operating part that is rotated by a motor 2 in the fully closed direction of 0 degrees, a potentiometer 4 that detects the rotation angle of this damper 3 and outputs a corresponding resistance value signal θf, and a memory. The microcomputer 5 is provided as a starting end value storage means, an end value storing means, an interpolation means, and a control section, which will be described later. The microcomputer 5 receives the operation on/off command signal for the damper 3 from the remote controller 6 and the damper opening command signal θi as a target position signal, and the resistance value signal θf from the potentiometer 4, and calculates the difference between the two signals. The relay contact 7 or 8 is closed for a time corresponding to (θi-θf), and the motor 1 or 2 is driven to perform feedback control of the rotation angle of the damper 3.

The microcomputer 5 acts as a starting point value storage means, and when an operation off command signal is input from the remote controller 6, it closes the relay contact 8, drives the motor 2, and moves the damper 3 to the fully closed position (0). °) and when the damper 3 is in the fully closed position, the resistance value signal input from the potentiometer 4 is set to the starting point θf.
0 in the memory (S2, 3 in FIGS. 2 and 3,
9). Also, when an operation-on command signal is input from the remote controller 6 as a terminal value storage means, the relay contact 7 is closed and the motor 1 is driven to position the damper 3 at the fully open position (90°). When is located at the fully open position, the resistance value signal input from the potentiometer 4 is stored in the memory as the terminal value θf90 (see S4, 5, and 6 in FIGS. 2 and 3).

Furthermore, the microcomputer 5 has the following functions:
As an interpolation means, during the entire operation period after the input of the operation-on command signal, the remote controller 6 is
A corrected opening command signal (corrected target position signal) θi' is obtained by interpolating the damper opening command signal θi inputted from the opening command and represents the resistance value of the potentiometer 4 whose size corresponds to the opening command.
(See S7 in FIGS. 2 and 3). Then, the microcomputer 5 as a control unit uses the corrected opening command signal θi' obtained above in place of the damper opening command signal θi, and uses this modified opening command signal θi' and the resistance value signal from the potentiometer 4. The above-mentioned feedback control of the damper rotation angle is performed based on the deviation of θf (θi'-θf) (see S8 in FIG. 3).

The operation of the damper drive mechanism of the air conditioner configured as described above will be described next with reference to FIG. First, when an operation-off command signal is input from the remote controller 6 in step S9 of FIG. 3, the microcomputer 5 returns to the process of step S2. Then, in step S2, the damper 3 with the power turned on (see step S1) is rotated to the fully closed position (0°) by driving the motor 2 via the relay contact 8, and in step S3, the damper 3 is fully closed. The resistance value signal input from the potentiometer 4 of the damper 3 is stored in the memory as a starting point value θf0. Next, when an operation-on command signal is input from the remote controller 6 in step S4, the microcomputer 5 proceeds to step S5, drives the motor 1 via the relay contact 7, and moves the damper 3 to the fully open position (90° ), and in step S6, the resistance value signal input from the potentiometer 4 of the fully opened damper 3 is stored in the memory as the terminal value θf90.

Next, in step S7, the microcomputer 5 uses a straight line L as shown in FIG. The damper opening command signal θi is interpolated to obtain a corrected opening command signal θi' representing the resistance value of the potentiometer 4 having a magnitude corresponding to the opening command as shown by the arrow in FIG. Then, in step S8, relay contact 1 or 2 is operated for a time corresponding to the deviation (θi' - θf) between this corrected opening command signal θi' and the resistance value signal θf, which is the rotation angle detection signal from potentiometer 4. Close and drive motor 1 or 2 to damper 3
Feedback control of rotation angle.

Therefore, the opening command signal θi corresponding to an arbitrary opening between the fully closed position 0° (starting end position) and the fully open position 90° (ending position) is determined by the opening command signal θi of the damper 3 in the fully closed and fully open positions. Interpolated with the actual resistance value of potentiometer 4, damper 3
The resistance value signal that would actually be output from the potentiometer when is at that opening, that is, the corrected opening command signal θi
' and is used for feedback control of the damper rotation angle.

Therefore, the relay contacts 7 and 8 are not affected by variations in the resistance value inherent in the resistance element of the potentiometer 4 or due to changes over time, and the relay contacts 7 and 8 are operated for an appropriate time by an appropriate deviation signal.
By closing the damper 3 and driving the motors 1 and 2, the damper 3 can be controlled to always be in an accurate position. For this reason, it is possible to fully close or close the valve without using a conventional limit switch.
The motors 1 and 2 can be reliably stopped at the fully open position, the damper 3 can be accurately set to the desired opening degree, the drive mechanism can be made simple and inexpensive, and there is no excess or deficiency in the supplied air volume, which increases the capacity of the air conditioner. You can make the most of it.

In the above embodiment, the microcomputer 5 serving as the start value storage means, the end value storage means, and the interpolation means,
Since the damper 3 also serves as a control section for performing feedback control, the control device for the damper 3 can be integrated in a compact manner, which is advantageous in that it is easy to use and can reduce costs. Note that the target position correction device of the present invention can also be constructed by removing the function of the control section from the microcomputer 5 of the above embodiment, and in this case as well, by simply providing a separate damper control section, the damper circuit can be changed as described above. The moving angle can be controlled accurately. Further, the corrected target position signal output by the target position correction device can be used not only for the feedback control of the embodiment but also for fixed position control. Further, the target position correction device of the present invention can be applied not only to the damper of the air conditioner of the embodiment but also to any mechanism with a potentiometer including a reciprocating mechanism.

[0019]

As is clear from the above description, the target position correction device for a mechanism with a potentiometer of the present invention has an operating section having a potentiometer that detects an operating position and outputs a resistance value signal, and a starting point value storage means. The resistor is positioned at the starting end position at a predetermined time, and the resistance value signal at that time is stored in the memory as the starting end value, while the ending value storage means
It is positioned at the end position at a predetermined time, and the resistance value signal at that time is stored in the memory as the end value, and the interpolation means interpolates the target position signal with a straight line connecting the start end value and the end value. Since it is output as a corrected target position signal representing the resistance value of the potentiometer, if the operating section is controlled by this corrected target position signal, a simple and inexpensive configuration that does not require a limit switch etc. can be achieved. Accurate position control can be performed without being affected by variations in resistance values inherent in the potentiometer or due to changes over time.

[0020]

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a damper drive mechanism of an air conditioner, which is an example of the target position correction device of the present invention.

FIG. 2 is a diagram showing the interpolation principle of the microcomputer of the damper drive mechanism.

FIG. 3 is a flowchart showing the flow of processing by the microcomputer.

[Explanation of symbols]

1, 2...Motor, 3...Damper, 4...Potentiometer,
5... Microcomputer, 6... Remote controller, 7, 8... Relay contact, θi... Damper opening command signal, θ
f...resistance value signal, θf0...starting end value, θf90...ending end value,
θi'...Corrected opening command signal.

Claims (3)

[Claims] 1. An operating section (3), a potentiometer (4) that detects the operating position of the operating section (3) and outputs a signal (θf) representing a resistance value, a memory, and a potentiometer (4) that detects the operating position of the operating section (3) and outputs a signal (θf) representing a resistance value. (3) at the starting position, and move the operating part (3)
When the above potentiometer (4) is located at the starting position,
a starting point value storage means (5) for storing a resistance value signal inputted from the terminal as a starting point value (θf0) in the memory;
3) is located at the end position, the potentiometer (
Terminal value storage means (5) for storing the resistance value signal inputted from 4) as a terminal value (θf90), and a starting terminal value (θfo) for storing the target position signal (θi) in the memory.
and the terminal value (θf90), and outputs the interpolation means (5) as a corrected target position signal (θi') representing the resistance value of the potentiometer (4) of the corresponding size. A target position correction device featuring a mechanism with a potentiometer. 2. An operating section (3), a potentiometer (4) that detects the operating position of the operating section (3) and outputs a signal (θf) representing a resistance value, and a target position signal (θi).
and the resistance value signal (θf) from the potentiometer (4)
) a control unit (5) that controls the operating unit (3) based on
and a memory, position the operating section (3) at the starting end position at a predetermined time, and calculate the resistance value signal inputted from the potentiometer (4) when the operating section (3) is located at the starting end position as a starting end value (θfo). a starting end value storing means (5) for storing in the memory as a starting point value; and positioning the operating section (3) at a terminal position at a predetermined time, and when the operating section (3) is located at the terminal position, a starting point value is inputted from the potentiometer (4). and a straight line connecting the target position signal (θi) to the starting value (θfo) and the final value (θf90) stored in the memory. The corrected target position signal (θ
interpolation means (5
) A target position correction device of a mechanism with a potentiometer. 3. The target position correction device for a mechanism with a potentiometer according to claim 2, wherein said control section (5) performs feedback control based on said target position signal (θi) and said resistance value signal (θf).