JPS5934494Y2 - Blower control device for automotive air conditioners - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for controlling the rotation of a blower in an air conditioner for an automobile.

In air conditioners, the blower is controlled manually, in addition to the manual method in which passengers adjust the air volume according to their own preferences.
Automatic systems have been added that change the air volume according to the conditions inside the vehicle.

Whether manual or automatic mode is selected is left to the passenger's choice; however, when automatic mode is selected, the position of the air mix door is largely representative of the condition inside the cabin, and the rotation speed of the blower is determined accordingly. There are many methods in which this is controlled.

Air mix doors basically compare the set temperature and the interior temperature (sometimes corrected by outside temperature, solar radiation, etc.). It is controlled so that the smaller the temperature difference, the more it is moved to the middle position.

In order to adapt to this type of temperature control, the fan rotation is controlled so that when there is a large difference from the set temperature, the fan rotates quickly to quickly set the temperature inside the vehicle, causing the temperature inside the vehicle to rise. If the difference becomes small, the temperature inside the vehicle is controlled to be comfortable by lowering the rotation of the fan and gradually bringing the temperature closer to the set temperature.

However, during heating, when the car's room temperature is low, the air mix door is moved to the full hot side and the blower is rotated at high speed to enable rapid heating, but the displacement of the air mix door is quite large. As the temperature inside the vehicle increases and the temperature difference decreases, the vehicle begins to move, so even if the temperature near the legs becomes quite high and the lower body feels warm enough, the temperature inside the vehicle does not approach the set temperature. As the engine continues to rotate at high speeds, the temperature may temporarily rise to the same level or higher than the set temperature, especially in the area near the legs of the front seat, causing discomfort. Become.

To do this, once the temperature in the chambers near the legs reaches a temperature sufficient to give a feeling of heating, reduce the speed of the blower from high speed to the next lower speed to gradually bring the temperature inside the vehicle closer to the set temperature. The air conditioning feels much better if you do this.

Therefore, this invention controls the rotation of the blower 11 in multiple stages by moving the slider 13a of the air volume adjustment switch 13 in conjunction with the position of the air mix door, and by moving the slider 13a of the air volume adjustment switch 13 to control the rotation of the blower 11 at fixed contacts 13b to 13i.
Select the blower control resistances 10a, 10b, 10c,
10e is selected, and an indoor temperature detection switch 15 is provided below the instrument panel to detect the temperature near the leg of the front seat. The high speed contact 13 of the air volume adjustment switch 13 is activated by the output of the temperature detection switch 15.
d is the control resistor 10a or control resistor 10 for adjusting the air volume;
Selector switch 1 that switches and connects a, t, 10, and b.
4, and when the temperature of the near chamber of the leg reaches the predetermined temperature,
By switching the changeover switch 14, the rotation speed of the blower 11 is reduced to the next rotation speed.

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

1 is a power source, 2 is a main switch of the automobile air conditioner, 3 is a drive circuit for the cooling device, 4 is a rotation control circuit for the blower, and the drive circuit 3 for the cooling device is connected to the air conditioner switch 5.
, a thermo switch 6, a defrost switch 7, and a magnetic clutch 8. When the air conditioner switch 5 is closed, air conditioner (cooling) operation is performed.

9 is a blower air volume adjustment switch, 9a is an off contact, 9b is a slider, 9 c , 9 d , 9 e , 9
f is a fixed contact, contact 9c is an auto switching contact, contact 9d
is a contact for low speed, contact 9e is a contact for medium speed, and contact 9f is a contact for high speed.

9g is a fixed contact which is connected to the slider 9b during auto mode.

10a, 10b, 10c, and 10e are resistances for controlling the rotational speed of the blower, which are controlled by the air volume adjustment switch 9 of the blower.
The wires are connected so that the resistance value can be switched in stages.

11 is a motor of a blower. 12b and 12c are switches for selecting the air volume adjustment switch 13 in auto mode; 13 is an air volume adjustment switch in auto mode; switch 12 b t 12 c is a switch for selecting the air volume adjustment switch 13 in auto mode;
When the slider 9b of the air volume adjustment switch 9 comes into contact with the contact 9c, the coil 12a is excited, and the switch 12
b.

12c is switched to close the switching point and select the air volume adjustment switch 13 during auto mode.

The air volume adjustment switch 13 in automatic mode has a slider 13a that works with an air mix door (not shown) that controls the temperature of the blowing air by changing the mixing ratio of cold air and warm air, and a movable contact on the ground side. Two fixed contacts 13b and 13c connected via 12b, and six fixed contacts 13d facing the fixed contacts.

13e, 13f, 13g, 13h, and 13i, fixed contacts 13d and 13i are high-speed contacts, and both connect through the changeover switch 14 to the connection point between resistors 10a and 10b and the connection point between resistors 10b and 10c. are connected to
Fixed contacts 13e and 13h are medium speed contacts, and both have a resistance of 10
b and 10c, fixed contacts 13f and 1
3g is a low speed contact, both of which are connected to the connection point between resistors 10c and 10e.

The fixed contacts 13f and 13g are further grounded via the movable contact 12c.

In this way, high-speed contacts are provided on both sides, medium-speed contacts are provided on the inside, and two low-speed contacts are provided on the innermost side for heating and cooling (air conditioner). )
This is because the movement of the air mix door differs depending on the two modes: during heating, the air mix door moves upwards (full hot side) from the intermediate position, and during cooling, the air mix door moves downwards from the intermediate position (full hot side). Full cool side)
Since the temperature difference is the largest when it is at both ends and the smallest when it is in the middle, the air volume adjustment switch 13 of the blower is configured accordingly.

In the automatic air volume adjustment switch 13, when the slider 13a is in the state shown in the figure, current flows through the resistor 10a, the blower motor 11 rotates at high speed, and the slider 13a switches sequentially. Therefore, even if the slider 13a is not in contact with this contact point, it will flow through the contact point 12c and rotate at a low speed.

The excitation coil 14a of the changeover switch 14 that switches from high speed rotation to the next low speed rotation (medium speed rotation in this embodiment) is
A vehicle interior temperature detection switch 15 is provided on a circuit connecting the fixed contact 9g and the anti-force source side of the main switch 2, and is further provided on this circuit in series with the excitation coil 14a.

The vehicle interior temperature detection switch 15 is composed of a temperature detection sensor and an element that opens and closes a circuit using the temperature detection sensor. It is located inside the center console or in a location facing the passenger.

This vehicle interior temperature detection switch 15 is set so that the temperature near the feet is a desired temperature (for example, around 22 degrees in this embodiment).

), the contact is switched from closed to open.

Therefore, below the desired set temperature, the vehicle interior temperature detection switch 15 remains closed, so that the coil 14a is energized and the changeover switch 14 is connected to the high speed side as shown.

When the temperature in the chamber near the legs rises and becomes below the desired set temperature, the vehicle interior temperature switch 15 is opened and the selector switch 1 is opened.
4 is switched and becomes connected to the medium speed side.

16 is a diode for preventing backflow; this diode 16
This circuit is installed to prevent the vehicle interior temperature detection switch 15 from switching from high-speed rotation to medium-speed rotation when the air conditioner is running.

In the above configuration, by appropriately switching the air volume adjustment switch 9 to the manual side contacts 9d-f, the rotation of the blower motor 11 is switched between high speed, medium speed, and low speed.

When the air volume adjustment switch 9 is switched to the auto contact point 9c, the switches 12b and 12c for selecting the air volume adjustment switch 13 in auto mode are closed by the excitation of the coil 12a, and control by the air volume adjustment switch 13 in auto mode is performed. .

At the same time, the slider 9b is connected to the contact 9g.

The slider 13a of the air volume adjustment switch 13 in auto mode is displaced by an air mix door (not shown), and when the temperature is in the heating mode and there is a large difference between the set temperature and the cabin temperature, the slider 13a is at the position indicated by the dotted line, and the contact point 13d is at the position indicated by the dotted line. Since the vehicle interior temperature switch 15 is also closed (the temperature is below the desired temperature), the changeover switch 14 is also in the solid line position and is connected to the high speed side, causing the blower motor 11 to rotate at high speed.

Then, due to the high speed rotation of the blower motor 11, the temperature near the legs rises and when a sufficient feeling of heating is achieved in the legs, the cabin temperature switch 15 opens and the changeover switch 14 is switched to the medium speed side. The connection is now made, and the rotation of the blower motor 11 is slowed down.

As a result, the temperature in the vehicle interior gradually increases, thereby preventing discomfort caused by overshooting the air volume and improving the feeling of air conditioning.

Furthermore, since the rotation speed can be switched from high speed to medium speed quickly, the noise of the blower can be reduced.

Furthermore, as shown in Fig. 2, this invention makes it possible to obtain a characteristic line as shown by the dotted line, and the speed is shifted to medium-speed rotation earlier than when only the air volume adjustment switch 13 in auto mode is shown as a solid line. It is.

This idea is configured as described above, so that when the temperature near the legs reaches a temperature sufficient to provide a feeling of heating, the rotation of the fan is reduced from high speed to the next lower speed, which can be used in the initial stages of heating. This prevents the discomfort caused by overshoot of air volume at times, and improves the feeling of air conditioning.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of this invention, and FIG. 2 is a characteristic diagram. 4...Blower rotation control circuit, 9...
Blower air volume adjustment switch, 11...Blower motor, 13...Blower air volume adjustment switch in auto mode, 14...Selector switch, 15...
...Indoor temperature detection switch.

Claims (1)

[Claim for Utility Model Registration] Multi-stage rotation control of the blower 11 is performed by moving the slider 13a of the air volume adjustment switch 13 in conjunction with the position of the air mix door and selecting the fixed contacts 13b to 13i. Control resistors 10a, 10b. 10c and 10e are selected, and an indoor temperature detection switch 15 is provided below the instrument panel in order to detect the temperature near the leg of the front seat. The output of the indoor temperature detection switch 15 causes the air volume adjustment control resistor 10a or the control resistor 10a to be connected to the high speed contact 13d of the air volume adjustment switch 13. 10b is provided, and when the temperature of the near chamber of the leg reaches a predetermined temperature, the changeover switch 14 is provided.
4. A blower control device for an air conditioner for an automobile, characterized in that the rotation speed of the blower 11 is reduced to the next rotation speed by switching the blower 11.