JPS6335847Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a mode door for automobile air conditioners,
This relates to a motor actuator that moves an air mix door, etc.

In the case of automobile air conditioners, the load on the motor actuator that moves the mode door, air mix door, etc. is, of course, very light, as it is about the weight of the door itself, but wind pressure increases due to the rotation of the blower, increasing the load. . The load is maximum when the blower rotates at its maximum, and the load on the door increases in proportion to the blower rotation speed (air volume) setting. It has the unique ability to move the door when the blower is at maximum rotation. This has caused an increase in the driving sound of the motor actuator.

On the other hand, the noise of the blower tends to increase in proportion to the rotation speed setting, and when the blower rotates at maximum,
Although the driving sound of the motor actuator is canceled out and cannot be heard, there is a drawback that the driving sound of the motor actuator can be heard at low rotation speeds or when stopped.

For this reason, this invention aims to reduce the drive noise of the motor actuator.
The gist is that the motor actuator 1 is composed of a motor 2, a rotation control switch 3 that controls the rotation of the motor 2, and an actuator drive circuit 13 that selectively outputs a drive output to the rotation control switch 3. A blower control switch 15 that controls the rotation speed;
a rotation speed detection switch 24 that is rotated in conjunction with the rotation of the motor 2 and increases the capacity of the motor 2 as the rotation speed increases;
4 and the blower control switch 15 are connected in parallel to the power supply 14, and the rotation speed detection switch 24 is connected to the actuator drive control circuit 13.
This is because they are connected in series.

Therefore, the motor of the motor actuator is controlled to a rotation output proportional to the rotation setting of the blower,
This ability is necessary and sufficient to cope with the load that increases in proportion to the rotation speed of the blower, and it is possible to reduce the drive noise of the motor actuator when the blower is stopped or at low rotation speed. The above-mentioned problem can be achieved.

Examples of this invention will be described below with reference to the drawings.

In FIG. 1, an example is shown in which the motor actuator 1 is used in an automobile air conditioner, and the motor actuator 1 consists of a motor 2 and a rotation control switch 3 that controls the rotation of the motor 2. The output of the motor 2 is The signal is transmitted via a cam device (not shown) to the door 7 that separates the upper air outlet 5 and lower air outlet 6 of the automobile air conditioner 4, and the defrost door 9 that opens and closes the defrost port 8, and is opened and closed as appropriate depending on the mode.

The rotation control switch 3 includes a movable switch plate 10 that is rotated by the rotation of the motor 2, and four fixed contacts 11a, 11b, 11 that are in contact with the movable switch plate 10.
The movable switch plate 10 has a non-conducting portion 12 formed by cutting out a conductive plate on its periphery, and is fixed on the circumference including this non-conducting portion 12. The contacts 11a to 11d are arranged at appropriate angles, and the common contact 11e is arranged inside the fixed contacts 11a to 11d and is in constant contact with the movable switch plate 10.

One of the fixed contacts 11a to 11d is selected and energized by an actuator drive control circuit 13 described below, and a drive current is applied to the motor 2 through the common contact 11e.

The actuator drive control circuit 13 outputs drive outputs according to set modes, and in this embodiment, DEF, FACE, FOOT, BI-LEVEL
It has switches 13a to 13d corresponding to four modes, and when the face mode is set, the switch 13b is closed in conjunction, and the power supply 14 is connected to the terminal voltage control circuit 28 and the motor actuator 1 as described below. Fixed contact 11b, movable switch plate 1
0, a drive current is applied to the motor 2 via the common contact 11e, and the motor 2 is rotated. Due to this rotation, the door 7 of the automobile air conditioner 4 is rotated counterclockwise from the position indicated by the solid line, and the movable switch plate 10 is
When the door 7 closes the lower air outlet 6, a contact enters the non-conducting portion 12 of the movable switch plate 10, cutting off current to the motor 2, and the motor 2 stops rotating. In this way, the motor actuator 1 is configured to switch the mode door according to the output from the actuator drive control circuit 13.
is driven.

In the blower control switch 15, when a knob 16 is rotated, a movable contact 17 linked to the knob 16 rotates to select one of the fixed contacts 18a, 18b, or 18c.
The rotation of the blower 20 is controlled by resistors 19a and 19b connected to the fixed contacts 18a, 18b, and 18c.
An OFF contact is provided, 21 is a fixed contact for driving a compressor 22, and 23 is a common contact.

The blower control switch 15 is also provided with a rotation speed detection switch 24 that is linked to the switch 24. The switch 24 has a movable contact 25 that is linked to the knob 16, a fixed contact 26a that the movable contact 25 selectively contacts,
The fixed contacts 26a to 26c are connected to resistors 28a to 28c of a terminal voltage control circuit 28, respectively, and the common contact 27 is connected to the power source 14. The magnitude of the resistors is 28a>28b>28c, and the terminal voltage is controlled by the resistors 28a to 28c, thereby controlling the rotational output of the motor. The knob 16 is in the position shown in the figure, and when it is OFF, the blower is stopped, but the movable contact 25 of the rotation speed detection switch 24 contacts the fixed contact 26a, and the motor 2 of the motor actuator 1 is Since the current flows through the resistor 28a of the terminal voltage control circuit 28, the lowest current is applied, and the output of the motor 2 of the motor actuator 1 is the smallest, making it possible to suppress noise during driving. .

Next, when the knob 16 is rotated to maximize the rotation of the blower 20, the movable contact 25 of the rotation speed detection switch 24 comes into contact with the fixed contact 26d, and the power supply voltage is applied to the motor 2 of the motor actuator 1. The maximum driving force can be obtained.

In this way, when the rotation of the blower is stopped or low, the terminal voltage of the motor is at a minimum, reducing drive noise, and when the rotation of the blower is high, the terminal voltage of the motor is at its maximum, allowing a large output to be obtained.

However, the driving sound of the motor actuator is canceled out by the noise of the blower not only when the blower rotates at high speeds, but also when the blower rotates at low speeds, and is not audible to the occupants, so the feeling can be improved.

In this embodiment, the motor actuator is illustrated and described as one that rotates in one direction, but it is clear that the motor actuator is not limited to this and can also be used for a motor actuator that rotates in forward and reverse directions to control an air mix door.

FIG. 2 shows another embodiment of this invention. In this embodiment, the motor of the motor actuator is driven by pulses, and the rotational output is controlled by duty control.
The air volume (rotation speed) signal from the pulse control circuit 30
Duty ratio control is performed to appropriately determine the pulse width applied to the motor of the motor actuator.

That is, when the blower 20 is stopped, the pulse width is small, and as the rotation speed increases, the pulse width is controlled to increase stepwise or linearly, and at the maximum rotation speed, the pulse width is maximum, and the pulse width is output is maximum. and,
This output is applied to an actuator drive circuit 13 having a configuration similar to that of the previous embodiment, and is applied to selected switches 13a to 1 of the actuator drive circuit 13.
It is common to the motor 2 via 3d. Therefore, the rotation speed of the motor 2 is controlled according to the duty ratio.

The other parts are the same as those in the previous embodiment, so the same numbers are given and the explanation is omitted.

As described above, according to this invention, since the rotational output of the motor of the motor actuator is controlled in proportion to the rotation speed of the blower, the drive noise of the motor actuator can be heard when the blower is stopped or at low rotation speed. This has the effect of reducing noise levels, and can contribute to reducing vehicle interior noise. In addition, in this case, it is possible to improve the stopping accuracy by reducing the output of the motor.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of this invention, and FIG. 2 is a block diagram of main parts showing another embodiment of this invention. 1...Motor actuator, 2...Motor,
3... Rotation control switch, 15... Blower control switch, 28... Terminal voltage control circuit, 30... Pulse control circuit.

Claims (1)

[Scope of utility model registration request] In a motor actuator comprising a motor, a rotation control switch that controls the rotation of the motor, and an actuator drive circuit that selectively outputs a drive output to the rotation control switch, a blower control switch that controls the rotation speed of the blower; A rotation speed detection switch that rotates in conjunction with the rotation of the blower control switch and increases the capacity of the motor as the rotation speed increases, and the rotation speed detection switch and the blower control switch are connected in parallel to the power source. and the rotation speed detection switch is connected in series to the actuator drive control circuit.