JPH07298689A - Drive controller of motor actuator - Google Patents

Abstract

PURPOSE:To set the position of the origin without spoiling the durability while making the best use of a pulse count motor actuator which has an easy structure and which can be manufactured at low cost. CONSTITUTION:In a drive controller of a pulse count motor actuator using a toroidal coil 19, a controlling program is stored in a microcomputer 16. When the power is turned on, the controlling program rotates a motor 13 in a specified direction until no pulse is generated and after that, it rotates the motor in the opposite direction the specified number of pulses and sets and stores that position as an origin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device for a pulse counting type motor actuator for driving an automobile air conditioning door.

[0002]

2. Description of the Related Art Conventionally, as a pulse count type motor actuator for driving an automobile air-conditioning door, for example, a pulse generated in a brush of a motor due to rotation of the motor is detected by a toroidal coil and counted to a target number. Then, there is one in which the motor is stopped (see, for example, JP-A-5-502963).

However, in such a pulse counting type motor actuator, the memory is lost when the power is turned off by removing the battery or the like. Therefore, the origin position is set again and the counting is performed again. There is a need.

A method of setting the origin position is to rotate the motor in a predetermined direction and set the position of the motor when a sufficient time has passed to guarantee that the door has reached the limit position as the origin position. A method is conceivable (see, for example, JP-A-5-502963 and Japanese Utility Model Laid-Open No. 64-14507).

[0005]

However, in such an origin position setting method, since the drive current is supplied to the motor for a predetermined time, the door has already reached the limit position and the motor is locked and stopped. Nevertheless, the drive current may be supplied to the locked motor. In this case, stress (load) may be applied to the axis of the air conditioning door or the motor actuator, which may cause mechanical backlash, or may cause damage to the motor by energizing the locked motor for a long time. , There was a problem in terms of life or durability.

The present invention has been made in view of the above problems of the prior art, and the durability is impaired while enjoying the advantage of the pulse count type motor actuator that the structure is simple and can be manufactured at low cost. It is an object of the present invention to provide a drive control device for a motor actuator that can set the origin position without the need.

[0007]

In order to achieve the above object, in a drive control device for a motor actuator according to the present invention, a motor for driving an automobile air-conditioning door, a motor drive means for driving the motor, and Pulse detection means for detecting the pulse generated with the rotation of the motor, counting means for counting the number of the pulse, when the power is turned on, the motor in a predetermined direction until the pulse is no longer generated. After the rotation, it has a control means for controlling the motor driving means so as to rotate a predetermined number of pulses in the opposite direction, and a setting means for setting a position where the predetermined number of pulses is counted as an origin position. It is configured.

The position where the pulse detecting means is arranged can be built in the motor actuator, but from the viewpoint of simplifying the structure of the motor actuator,
It is preferably arranged outside the motor actuator.

Further, in order to keep the manufacturing and maintenance costs low, it is preferable that the pulse detecting means is composed of a toroidal coil.

[0010]

In the present invention configured as described above, when the power is turned off and then turned on again, the control means causes the motor drive means to rotate the motor in a predetermined direction. While receiving the signal from the pulse detecting means. When no pulse is detected, it is determined that the motor is locked, and the motor is immediately rotated in the opposite direction via the motor drive means, and the motor is stopped at the position counted by the predetermined number of pulses by the counting means. Let
The setting means sets that position as the origin position and stores it in the memory.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a drive control device for a motor actuator according to an embodiment of the present invention. Here, as an air conditioning door for an automobile, an air mix door 10 arranged in a heater unit for adjusting a ratio of cold air and warm air will be described as an example. Air mix door 1
0 is driven by a motor actuator 11 which functions as an air mix door actuator, and the motor actuator 11 is controlled by a control unit 12.

The motor actuator 11 comprises a DC motor 13 and a reduction mechanism 14 connected to the output shaft of the motor 13. The reduction mechanism 14 is configured by combining a plurality of gears. Air mix door 10
It is attached to the drive shaft attached to the final gear of the reduction mechanism 14, and is rotatable within a predetermined range by the rotational force of the motor 13. The rotation range of the air mix door 10 is regulated by two limit positions, a full hot position (FH) and a full cool position (FC). When the air mix door 10 is in the full hot position (FH), the opening degree of the air mix door 10 is maximum, the proportion of warm air is maximum, and the maximum heating capacity is exhibited.
When the air mix door 10 is in the full cool position (FC), the opening degree of the air mix door 10 is minimum, the proportion of warm air is minimum, and the maximum cooling capacity is exhibited. In this embodiment, a toroidal coil, which will be described later, is provided without incorporating a position detection switch, a position detecting variable resistor (PBR) or the like in the motor actuator 11 for detecting the rotational position of the motor 13, and 1
The position of 3 is detected.

The control unit 12 is a unit for automatically controlling the temperature of the air blown into the passenger compartment,
According to a preset control program, various input signals are arithmetically processed to control the operation of the motor actuator 11. The control unit 12 includes an input signal processing unit 15 and a microcomputer (microcomputer) 1.
6, a shift register 17, a comparator 18, a toroidal coil 19, a pulse amplifier 20, a frequency divider 21, a shift register 22, and a motor driver 23. The motor driving means is a motor driver 23,
The pulse detecting means is a toroidal coil 19, and the counting means is a pulse amplifier 20, a frequency divider 21, and a shift register 2.
2. The control means and the setting means are respectively configured by the microcomputer 16.

The input signal processing section 15 comprises an A / D converter, a temperature setting section, etc., and various sensors (for example, the inside air sensor 24, etc.) arranged outside the control unit 12.
Outside air sensor 25, solar radiation sensor 26, temperature setting switch 2
7), and sends the signal to the microcomputer 16 (CPU). The microcomputer 16 has, as a memory area, a ROM 16a that stores various control programs and the like, and a RAM 16b that stores various data such as origin position information described later.
Based on the control program, the input signals from the various sensors 24 to 27 are arithmetically processed to calculate the target opening of the air mix door 10, and this data is serially transmitted in 8 bits, for example, and the shift register 17 (for example, MB74).
HC164). The target opening data is given as the number of pulses from the origin position, for example. The shift register 17 converts the input serial data into parallel 8-bit data, and performs 8-bit parallel transmission of this data to generate an 8-bit comparator 18 (for example, T68).
401SA). The comparator 18 compares the target opening degree of the air mix door 10 with the current position as described later. In addition, R of the microcomputer 16
The OM 16a stores a program for controlling the process of setting the origin position as described later.

The toroidal coil 19 is for obtaining position information of the motor 13, and has a function of detecting a pulse generated as the motor 13 rotates. The pulse is generated according to the relative position between the brush and the commutator during rotation of the motor 13, and the generation of the pulse is, so to speak, commutation (also referred to as commutation) of the motor 13.
Of course, as a result of. Therefore, by counting this pulse, the position of the motor 13 can be accurately known.

FIG. 2 shows an example of the toroidal coil 19. FIG. 2A is a plan view of the toroidal coil 19,
FIG. 1B is a side view and FIG. 1C is a circuit configuration diagram.
The toroidal coil 19 is configured by winding a primary coil 31 and a secondary coil 32 around a ring-shaped core 30 made of a magnetic material such as ferrite, and functions as a detection transformer. For example, the preferred specifications are: The toroidal coil 19 has a diameter of 12
mm, thickness 6 mm, rated voltage is DC 14 V, self-inductance L1 of primary coil 31 is 0.17 mH, self-inductance L2 of secondary coil 32 is 1 mH, primary winding number T1 is 10 times, secondary winding number T2 is 25 The rated current is 0.5 A. As shown in FIG. 3 described later,
The primary coil 31 is connected to the motor 13 in series, and the secondary coil 32 is connected to the pulse amplifier 20. In this case, the pulse current I1 generated by the rotation of the motor 13
Flows through the primary coil 31, magnetic flux is generated in the core 30, a voltage is induced in the secondary coil 32, and the secondary current I having a waveform similar to the primary current I1 is generated in the secondary coil 32.
2 is produced in amplified form. That is, the toroidal coil 19 detects the pulse generated with the rotation of the motor 13 for each commutation and outputs it to the pulse amplifier 20.

The pulse amplifier 20 is a toroidal coil 1.
It is a circuit that shapes the pulse detected by 9 into a rectangular shape and amplifies it. A concrete circuit diagram of the pulse amplifier 20 is as shown in FIG. 3, for example. In this circuit, the pulse voltage from the toroidal coil 19 is applied to the operational amplifier 40.
After being amplified at point A by (for example, LP-351), the waveform is shaped at point B (cycle T). Thereafter, the amplified and shaped signal is sent to the IC circuit 41 (for example, IC 40
13) and is output as a rectangular pulse signal of high (H) (for example, 15 V and duration T) and low (L) (for example, 0 V).

The output signal (rectangular pulse) of the pulse amplifier 20 is input to a frequency divider 21 (for example, IC4024), and this frequency divider 21 generates an output signal having a frequency of 1/8 of the input signal frequency, The shift register 22 (for example, MB74HC
164). The shift register 22 temporarily stores the input position data, converts it into parallel 8-bit data, and sends the data to the 8-bit comparator 18 by 8-bit parallel transmission. The current position information from the frequency divider 21 is also input to the microcomputer 16 in preparation for setting the origin position.

The comparator 18 compares the target opening degree input from the microcomputer 16 via the shift register 17 with the current position input from the frequency divider 21 via the shift register 22 to drive the motor 13. Decide whether to rotate forward, reverse, or stop,
A control signal to that effect is output to the motor driver 23. For example, when the motor 13 rotates normally, the air mix door 10
Is assumed to move to the full hot (FH) side and reversely moves to the full cool (FC) side.
Assuming that the pulse number is added when 3 is rotated in the normal direction and subtracted when rotated in the reverse direction, the comparator 18 causes the motor 13 to rotate normally when the pulse number of the target opening is larger than the pulse number of the current position. When the number of pulses of the opening is smaller than the number of pulses of the current position, the motor 13 is reversely rotated, and when the number of pulses of the target opening is equal to the number of pulses of the current position, a signal to stop the motor 13 is generated. Preferably,
In consideration of the inertial force of the motor 13, when the difference between the pulse number of the target opening and the pulse number of the current position is within a predetermined value (for example, several tens of pulses), a signal for stopping the motor 13 is generated. Has become.

The motor driver 23 has a vehicle-mounted battery 2
8 (DC14V) is connected and the comparator 18
It has a function of switching an internal switch on the basis of a control signal from the ON and OFF of the power supply to the motor 13 and switching its direction. That is, when the signal for rotating the motor 13 in the normal direction is input, the motor 13 and the battery 28 are connected so that the current flows in the direction for rotating the motor 13 in the normal direction, and when the signal for rotating the motor 13 in the reverse direction is input,
When a signal for connecting the motor 13 and the battery 28 so that a current flows in the opposite direction to the above and a signal for stopping the motor 13 is input, the motor 13 and the battery 28 are switched to the non-connection state.

In the present apparatus configured as described above,
The setting of the reference origin position when counting the number of pulses is executed according to the flowchart of FIG. As described above, the control program at this time is stored in the ROM 16a of the microcomputer 16 and is executed each time the power is turned on. This is because, as described above, the memory disappears when the power is turned off, and the origin position must be reset.

First, when the microcomputer 16 detects that the power is turned on (S1), it moves the air mix door 10 in a certain direction, for example, at the full hot position (FH) (or the full cool position (FC)). Drive in the direction (S2). Specifically, the target opening is set to a value sufficient for the air mix door 10 to reach the full hot position (FH) (or the full cool position (FC)), and this data is sent via the shift register 17 to the comparator. 18
Send to. Then, the comparator 18 sends a signal for rotating the motor 13 in the normal direction (or reverse direction) to the motor driver 23, and the motor driver 23, which has received the signal, switches the internal switch to rotate the motor 13 in the normal direction (or reverse direction). For this purpose, the electric power is supplied to the motor 13 to drive the air mix door 10 toward the full hot position (FH) (or the full cool position (FC)).

While the motor 13 is rotating, a pulse generated by the rotation of the motor 13 is detected by the toroidal coil 19, and the signal is input to the microcomputer 16 via the pulse amplifier 20 and the frequency divider 21. When the input of the pulse signal is stopped, the microcomputer 16 (S
3) It is determined that the air mix door 10 has reached the limit position, the full hot position (FH) (or the full cool position (FC)), and the motor 13 is locked, and the air mix door 10 is moved from this position. In the opposite direction, that is, in the direction of full cool position (FC) (or full hot position (FH)), a preset number of pulses (for example, 1
Only 0 pulses are driven (S4). Specifically, the number of pulses that is smaller (or larger) by a predetermined number of pulses (10 pulses) than the count number of the current position is set as the target opening, and this data is sent to the comparator 18 via the shift register 17. As described above, by rotating the motor 13 in the opposite direction at the same time when the air mix door 10 reaches the limit position, the stress (load) applied to the shaft of the air mix door 10 and the motor actuator 11 when the motor 13 is locked. Occurs only temporarily, and energization of the locked motor can be completed in a short time. The predetermined number of pulses in S4 is the stress (load) on the shaft of the air mix door 10 and the motor actuator 11.
It may be set appropriately so that the air mix door 10 or the motor 13 comes to a position where it is not covered.

When the motor 14 is stopped in the process of S4, the microcomputer 16 sets the position stopped in S4 as the origin position and stores the data in the RAM 16b (S5). Specifically, the current count number corresponding to the position stopped in S4 is registered as the origin position information.

Therefore, according to this embodiment, when the origin position is set, the air mix door 10 is driven in a predetermined direction, and when the limit position is reached, the motor 13 is rotated in the reverse direction by a predetermined number of pulses. Therefore, when the motor 13 is locked, stress (load) is not applied to the shaft of the air mix door 10 and the motor actuator 11 only temporarily, and the locked motor 13 can be energized in a short time. Therefore, the risk of backlash and damage to the motor is greatly reduced, and the life or durability is improved.

Further, in this embodiment, the toroidal coil 19 for detecting the position of the motor 13 is arranged outside the motor actuator 11, and more specifically, is incorporated in the control unit 12, so that the position detecting switch is used. A variable resistor for position detection, an encoder, and the like do not have to be built in the motor actuator 11, and the harness of the motor actuator 11 can be two, so that the structure of the motor actuator 11 can be simplified. Then, the motor actuator 11 is simply replaced by the motor 13 and the speed reduction mechanism 1.
4, the motor actuator 11 can be downsized and the manufacturing cost can be reduced.

Further, in the present embodiment, since the position of the motor 13 is detected by using the toroidal coil 19 which is inexpensive and has a simple structure, the manufacturing and maintenance costs can be reduced.

In the present embodiment, the air mix door 10 is described as an example of an automobile air conditioning door, but the present invention is not limited to this, and other air conditioning doors (for example, intake door, mode door). It is also applicable when setting the origin position of ().

The configuration for performing motor position detection and positioning control using the toroidal coil 19 is shown in FIG.
The toroidal coil 1 is not limited to those described above.
9 as long as it has a means for storing the position signal from 9, a means for storing the input target position signal, and a means for comparing the current position signal and the target position signal and outputting the result to the motor driver 23. It may have any configuration.

[0030]

According to the invention of claim 1, when the origin position is set, stress (load) is temporarily applied to the axis of the air conditioning door for automobiles and the motor actuator, and to the locked motor. Since it will be possible to energize in a short time,
The life or durability is improved.

According to the invention of claim 2, the structure of the motor actuator can be simplified and miniaturized, and the manufacturing cost can be reduced.

According to the invention of claim 3, the cost for manufacturing and maintenance can be reduced.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an example of a toroidal coil.

FIG. 3 is a circuit configuration diagram of a pulse amplifier

FIG. 4 is a flowchart of origin position setting processing.

[Explanation of symbols]

 10 ... Air mix door (automatic air-conditioning door) 11 ... Motor actuator 12 ... Control unit 13 ... DC motor 16 ... Micro computer (control means, setting means) 19 ... Toroidal coil (pulse detection means) 20 ... Pulse amplifier (counting means) 21 ... Frequency divider (counting means) 22 ... Shift register (counting means) 23 ... Motor driver (motor driving means)

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[Procedure amendment]

[Submission date] May 16, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (3)

[Claims] 1. A motor (13) for driving an automobile air-conditioning door (10), and a motor driving means (23) for driving the motor (13).
A pulse detecting means (19) for detecting a pulse generated by the rotation of the motor (13), and a counting means (20, 2) for counting the number of the pulses.
1, 22), and when the power is turned on, after the motor (13) is rotated in a predetermined direction until the pulse is no longer generated,
Control means (16) for controlling the motor driving means (23) so as to rotate a predetermined number of pulses in the opposite direction, and setting means (16) for setting a position where the predetermined pulse number is counted as an origin position. A drive control device for a motor actuator, comprising: 2. The drive control device for a motor actuator according to claim 1, wherein the pulse detection means (19) is arranged outside the motor actuator (11). 3. The drive control device for a motor actuator according to claim 2, wherein the pulse detection means (19) is formed of a toroidal coil.