JP2582488Y2 - 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 a control device for a motor actuator used in, for example, an air conditioner for a vehicle.

[0002]

2. Description of the Related Art In a recent automobile air conditioner, various doors (for example, an intake door, an air mix door, a mode door, etc.) provided inside the air conditioner are driven by a motor actuator having a built-in motor. Things have come to be heavily used.

As described above, a device that opens and closes a door by using a motor actuator requires a control device for controlling the operation of the motor actuator. The control device is generally configured as shown in FIG. It is configured and operates as follows. Here, an encoder type motor actuator using an encoder for position detection is shown.

An auto-amplifier 10 for controlling the operation of an air conditioner for an automobile is connected to various sensors 14 provided in various parts of the vehicle via an input unit 11 to a built-in microcomputer 12. Based on the signal from the sensor 14, the operation of each part of the vehicle air conditioner is controlled.
Also, the auto amplifier 10 has a built-in motor actuator control circuit 13 for driving the motor actuator 15,
The motor actuator control circuit 13 controls the motor actuator 15 based on a signal output from the microcomputer 12.
To control the drive of. A door 16 of the air conditioner for a vehicle is attached to an output shaft of the motor actuator 15, and the door 16 is rotated by the motor actuator 15 in a range between positions A and B in the figure. Also, to detect the position of the door 16, for example, an encoder 17 is attached to the output shaft of the motor actuator 15,
The code signal from the encoder 17 is input to the microcomputer 12.

[0005] The drive control of the motor actuator has conventionally been performed according to a flowchart shown in FIG. First, when the target position of the door 16 is determined based on input signals from the various sensors 14, the microcomputer 12 inputs the target position (S20). Next, encoder 17
(S21), the current position of the door 16 is calculated (S22), and it is determined whether or not the calculated current position matches the target position (S23). If they match, the supply of the drive current from the motor actuator control circuit 13 is stopped and the motor actuator 15
(S24) On the other hand, if they do not match, a drive current is continuously passed to the motor actuator 15 to rotate it in one direction (S25). Note that such a control step is hereinafter referred to as a normal process for a lock avoidance process described later.

[0006]

However, in such a conventional control device, when the door 16 is driven to the target position and stopped, as long as the current position does not match the target position. Once the motor actuator 15 starts rotating in one direction, it rotates in one direction. As a result, especially when the target position is an intermediate position between the A and B positions, for example, the encoder
Even if the current position cannot be recognized due to the recognition and overflow of the 17 code and the vehicle passes the target position (overrun), the motor actuator 15 continues to rotate in one direction, There is a possibility that the door 16 is pressed against the packing (not shown) in the A or B regulating position and the motor actuator 15 is locked. Conventionally, no measures have been taken to release such a locked state of the motor actuator 15 and return it to a predetermined target position.

The provision of the means for detecting the locked state of the motor actuator is disclosed in, for example, Japanese Utility Model Application Laid-Open No. 2-86.
Although they are disclosed in Japanese Patent Application Laid-Open No. 804 or the like, all of them are merely for the purpose of energy saving such as suppressing power consumption at the time of locking.

The present invention has been made in view of the above-mentioned problems of the prior art, and a motor actuator control device capable of detecting overrun of a motor actuator and returning the motor actuator to a predetermined target position. The purpose is to provide.

[0009]

In order to achieve the above object, the present invention provides a motor actuator for driving a driven body, power supply means for supplying a drive current to the motor actuator, and a power supply for the motor actuator.
A lock current detecting means for detecting a lock current that, the b
When the lock current is not detected by the lock current detection means, a drive current for rotating the motor actuator in one direction is supplied from the power supply means to the motor actuator, and the driven body is moved to the target position.
On the other hand, when the lock current is detected, the drive current for rotating the motor actuator in a direction opposite to the previous direction is supplied from the power supply unit to the motor actuator, and the driven body is again stopped.
Control means for performing control to stop at the target position .

[0010]

According to the present invention having the above construction, the driven
When the target position of the moving object (e.g., door) is determined, the control means performs control to stop it at the driven body is rotated in one direction with the motor actuator through the power supply means has reached the target position. Then, if the lock current
When the lock current is detected by the detection means and the motor actuator is in the locked state, that is, when it is detected that the motor actuator has overrun the target position, the control means reverses the rotation direction of the motor actuator through the power supply means. is allowed again, performs control Ru stopping it where the driven body <br/> has reached the target position.

Thus, when the driven body is set at the target position, even if the motor actuator is overrun and locked, the motor actuator is unlocked and the driven body is set at the predetermined target position. You can go back.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a motor actuator control device according to an embodiment of the present invention. still,
Here, an encoder-type motor actuator using an encoder for position detection is shown, and portions common to FIG. 3 are denoted by the same reference numerals.

As shown in the figure, an auto amplifier 10 for performing general operation control of an air conditioner for a vehicle includes an input unit 11.
And a microcomputer 12 with a built-in timer 18, a motor actuator control circuit 13, and a lock current detection circuit 20.
The input unit 11 is connected to various sensors (including switches) 14 provided in each part of the vehicle, a lock current detection circuit 20, and an encoder 17 described later, and converts these input signals into signals that can be processed by the microcomputer 12. To process. The microcomputer 12
By executing the program stored in the memory 19, the input signals of the various sensors 14 and the like input through the input unit 11 are arithmetically processed to control the operation of each unit of the vehicle air conditioner. The motor actuator control circuit 13 is connected to the microcomputer 12, and supplies a drive current to the motor actuator 15 in response to a command from the microcomputer 12. The motor actuator 15 rotates forward or backward according to the direction of the drive current, and stops when the power is cut off. A door 16 as a driven body is attached to an output shaft of the motor actuator 15. The door 16 is, for example, a door provided in an air conditioner for a vehicle for switching between inside and outside air, determining a mixing ratio of cold air and hot air, and opening and closing each outlet.
The door 16 is moved by the motor
ＢB position. For example, a packing (not shown) is provided at each of the regulation positions (A and B) of the door 16, and when the door 16 comes to the A or B position, the door 16
It comes to be pressed against. Lock current detection circuit 20
When the motor actuator 15 is locked, that is, when the door 16 comes into pressure contact with the packing, a larger amount of current (lock current) is generated than in the normal state where the motor actuator 15 rotates the door 16 within the range of the AB position. Using the current flowing through the motor actuator 15 , the lock current
Is a circuit for electrically detecting the lock state of the motor actuator 15 by detecting, for example, connecting a resistor between the motor and the power supply in the motor actuator 15, and based on the current supply to the motor Then, a voltage generated at both ends of the resistor is inputted, and when the voltage exceeds a preset threshold voltage, a lock current detection signal is output. Further, an encoder 17 is provided for detecting the current position of the motor actuator 15, that is, the rotation position of the door 16, and the encoder 17 interlocks with the rotation of the door 16 and outputs the current position information in the form of a code signal. Output to the auto amplifier 10. The power supply means is controlled by the motor actuator control circuit 13 to detect the lock current.
The output means is constituted by the lock current detection circuit 20, and the control means is constituted by the microcomputer 12.

The control device for the motor actuator configured as described above operates as follows. This operation will be described with reference to the flowchart of FIG. Here, the normal processing of step 5 in the figure is the same as the conventional operation flow shown in FIG. 4, and in the present invention, in addition to this normal processing program, the locked state of the motor actuator 15 at the time of locking is determined. The program of the lock avoidance processing which releases and returns to the normal processing is added.
Therefore, in the following, the flow for the lock avoidance process will be mainly described to avoid duplication of the description, and the description of the content of the normal process will be omitted.

Now, each control step will be specifically described. First, when the main power supply (not shown) is turned on and the execution of the program stored in the memory 19 is started, the microcomputer
In step 12, the abnormality flag F indicating whether the motor actuator 15 is locked is reset to 0 (S1) and the timer 18 is reset (S2). Next, a signal from the lock current detection circuit 20 is input (S3), and the presence or absence of a lock current detection signal, that is, the presence or absence of a code abnormality is determined (S4). If no code error is recognized as a result of this determination, normal processing is performed to stop the door 16 at the target position (S5), and the process returns to step 3. At this time, door 16
Is stopped at the target position, the motor actuator 15 stops until the next target position is set, and the motor actuator 15 is the same before the door 16 reaches the target position and after the target position is overrun. Will continue to rotate in that direction. When a code abnormality, that is, a lock current detection signal is recognized as a result of the determination in step 4,
The microcomputer 12 determines whether or not the abnormal flag F is set (S6). If the abnormal flag F is not set as a result, the microcomputer 12 sets the abnormal flag F to 1 (S7) and starts the timer 18 (S7). S8) Return to step 3. On the other hand, if the abnormality flag F is set as a result of step 6, it is determined whether or not the count time T of the timer 18 has become equal to or longer than a predetermined set time T ₀ (for example, 30 seconds). (S9), if not the count time T has reached the set time T ₀ the process returns to step 3, the process proceeds to step 10 if it has reached. Activating the timer 18 in this way is to distinguish it from the lock current detection signal output by the starting current of the motor actuator 15 so that the motor actuator is operated only when the lock current detection signal is continuously recognized for a certain period of time or longer. This is because it is determined that the motor actuator 15 is in the locked state, and accordingly, the presence or absence of the locked state of the motor actuator 15 is accurately determined. Step 9
If the count time T of the timer 18 as a result of the determination of the set time T ₀ or more, the microcomputer 12, the motor actuator 15 is determined to be in the locked state overrun, resets the abnormality flag to 0 ( Along with S10), the timer 18 is reset (S11), a command is output to the motor actuator control circuit 13 to reverse the direction of the drive current to the motor actuator 15, and the rotation of the motor actuator 15 is reversed (S12). Return to 3. As a result, the locked state of the motor actuator 15 is released, and the normal process of step 5 is executed again to try to stop the door 16 at the predetermined target position.

As described above, according to the present embodiment, when the door 16 is set at the target position, even if the motor actuator 15
Even if the vehicle is overrun and locked, the locked state can be released and the door 16 can be returned to a predetermined target position, and the controllability of the motor actuator 15 can be improved. In addition, as a device configuration for this purpose, it is sufficient to simply add the lock current detection circuit 20 to a conventional general control device, and in particular, in a device that already has the lock current detection circuit 20, it is only necessary to add or change the program. There is not much increase in cost. Further, even if the motor actuator 15 is locked, the motor actuator 15 is released, so that the power consumption at the time of locking is eliminated, which is effective in energy saving.

In the present embodiment, the case of the motor actuator 15 for driving the door 16 of the air conditioner for a vehicle has been described as an example. However, the present invention is applicable to the case of driving other driven members. Can of course be applied.

In this embodiment, the lock current detecting means
Although the lock state of the motor actuator 15 is electrically detected by using the lock current detection circuit 20 as described above, the invention is not limited thereto, and the lock state may be mechanically detected. Further, a magnetic sensor or the like may be disposed inside the motor to detect overload of the motor, thereby detecting the locked state of the motor actuator.

[0019]

As described above, according to the present invention, even if the motor actuator is overrun and locked, the locked state is released mainly by adding a program and the predetermined target position is obtained. , And controllability of the motor actuator can be improved without increasing the cost. In addition, even when the lock state is established, the lock state is always released and stopped at a predetermined target position, so that power consumption at the time of lock is eliminated and energy saving can be achieved.

[Brief description of the drawings]

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

FIG. 2 is an operation flowchart of the control device of FIG. 1;

FIG. 3 is a schematic configuration diagram of a conventional general motor actuator control device.

FIG. 4 is an operation flowchart of the control device of FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Auto amplifier 12 ... Microcomputer (control means) 13 ... Motor actuator control circuit (power supply means) 15 ... Motor actuator 16 ... Door (driven body) 17 ... Encoder 18 ... Timer 20 ... Lock current detection circuit (Lock current detection) means)

Claims (1)

(57) [Scope of request for utility model registration] 1. A motor actuator (15) for driving a driven body (16), power supply means (13) for supplying a drive current to the motor actuator (15), and a lock flowing through the motor actuator (15). Current
The lock current detecting means (20) to be detected, and when the lock current is not detected by the lock current detecting means (20) , the motor actuator (1)
5) the driving current for rotating in one direction by the power supply means (1
Previous 3) by supplying to the motor actuator (15)
While performing control to stop the driven body (16) at the target position, when a lock current is detected, a drive current for rotating the motor actuator (15) in a direction opposite to the previous direction is supplied. The electric power is supplied from the power supply means (13) to the motor actuator (15) to move the driven body (16) to the target position again.
And a control means (12) for performing control to stop the motor actuator.