JPS6237767Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air conditioner for automobiles, and in particular,
The present invention relates to a device that effectively utilizes power consumption during low speed rotation of a blower motor that takes in air.

Generally, in automotive air conditioners, one or both of inside air and outside air is taken into the intake unit by a fan driven by a motor, and the amount of air taken in is controlled by the number of revolutions of the motor. It is becoming more and more controlled.

However, conventionally, when operating this motor at low speed, a portion of the electric power is converted into heat using a resistor or power transistor connected in series in the motor's drive electric circuit, since DC power is used in automobiles. By changing the consumption, the terminal voltage of the motor is lowered and the rotational speed thereof is suppressed. In this way, the power consumed by the variable resistor or power transistor is released as heat into the air inside the air conditioner (or the atmosphere), which is a waste of power and ultimately increases the load on the engine's alternator. This is uneconomical. In addition, when the rotation speed is low, the wind speed decreases and the ability to mix hot and cold air also decreases, making it difficult to achieve comfortable air conditioning.

In view of these points, the present invention was devised for the purpose of providing an automotive air conditioner that can effectively utilize the power consumed when the motor rotates at low speed and provide comfortable air conditioning. A sub-motor is connected in series to the drive electric circuit of the blower motor, and the sub-motor is rotated using the surplus power when the main motor rotates at low speed, thereby consuming a predetermined amount of power. The air mixer fan is rotated to perform the air mixer's work.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of an air conditioning system for an automobile to which the present invention is applied, and this system has an intake unit 1, a cooler unit 2, and a heater unit 3. The intake unit 1 has a built-in fan 5 driven by a main motor 4, and is provided with an inside air inlet 6 through which a circulation flow into the vehicle interior flows and an outside air intake 7 through which outside air flows. Furthermore, in order to switch and control the air flowing into the intake unit 1 through the inside air inlet 6 and the air flowing through the outside air intake 7,
An intake door 8 is installed inside the intake unit 1, and is configured to switch between an internal air intake port and an external air intake port.

The cooler unit 2 into which the air from the intake unit 1 flows has a built-in evaporator 10 through which refrigerant from the refrigerant conduit 9 constituting the refrigeration circuit circulates. The air exchanges heat with the refrigerant and is cooled within the cooler unit 2, and then flows into the heater unit 3. A heater core 12 is installed in the heater unit 3 and is guided through a conduit 11 to heat the air passing through the cooler unit 2, through which engine cooling water circulates. A mixer door 13 is installed in front of the heater core 12.
is installed, and the mixer door 13 can be moved to any position between the closed position (F position), which closes the front surface of the heater core, as shown in Figure 1, and the open position (D position) shown in the figure, for example, the E position. By doing so,
The air that has passed through the cooler unit 2 is transferred to the heater core 1.
2, all of the air can be sent into the cabin after passing through the heater core 12, or some of the air from the cooler unit 2 can be passed through the heater core 12, while other air can be sent into the cabin. The air may be sent directly into the vehicle interior without passing through the heater core 12, or the two may be mixed (air mix) to form an appropriately heated air and sent into the vehicle interior.

The heater unit 3 includes a differential duct 14 for blowing air along the inner surface of the windshield to remove fogging and frost from the windshield, and a defer duct 14 for blowing air out through the air distribution chamber 15 toward the feet of the passenger. A floor duct 16 and an instrument duct 17 for blowing air into the vehicle interior from a center ventilator (not shown) of the instrument panel are provided. Def duct 1
4, a room door (floor door) 18 for controlling the distribution of air flowing to the floor duct 16, and a vent door 19 for controlling the distribution of air flowing to the instrument duct 17 are installed in the heater unit 3. . Switching control of these various doors 13, 18, and 19 is performed by operating a lever on a control device (not shown) provided on an instrument panel in front of the driver's seat.

An air mix fan 21 is installed in the air mix chamber near the mix door 13 in the heater unit 3, and is rotatably driven by a sub-motor 20 to perform a function suitable for air mix. The circuit is connected in series to the main motor 4. Also,
A controller 22 controlled by a fan switch 23 is connected to the motor 20, and power consumption of the motor 20 is increased or decreased by a minute current signal sent from the controller 22 based on the operation of the fan switch 23. It's becoming like that.

In the automotive air conditioner of the present invention configured as described above, when it is desired to rotate the main motor 4 at a low speed to reduce the amount of intake air, when the fan switch 23 is turned to the small air volume position, the controller 22
A minute current signal is sent from the sub-motor 20, power consumption in the sub-motor 20 increases, and the sub-motor 20 rotates at high speed. When the power consumption of the sub motor 20 increases, the power consumption of the main motor 4 connected in series with the sub motor 20 increases.
Since the terminal voltage at the main motor 4 decreases, the main motor 4 rotates at a low speed, thereby reducing the amount of intake air. Due to the high speed rotation of the sub-motor 20, the air mixing fan 21 stirs the air flow and enhances the air mixing effect. Therefore, when the main motor 4 rotates at a low speed, the wasted power that was conventionally consumed by resistors, etc. is consumed by the sub motor 20, and is effectively used for the work of air mixing.

On the other hand, if you want to rotate the main motor 4 at high speed to increase the intake air volume, the fan switch 23
When the sub-motor 20 is turned on to the large air volume position, a minute current signal is sent from the controller 22, the power consumption in the sub-motor 20 becomes zero, and the sub-motor 20 stops.
When the power consumption of the sub motor 20 becomes zero, the terminal voltage of the main motor 4 increases, so the main motor 4 rotates at high speed and the intake air volume increases. As a means of reducing the power consumption of the sub-motor 20 to zero, it is also possible to shoot the sub-motor 20 using a transistor or the like.

By the way, Mitsudoor 13 full cool (F
position), the air volume is large at the full hot position (D position),
In an automatic air conditioner in which the air volume is small at an intermediate position, air mixing is required when the air volume is small, so the above operating situation becomes even more effective.

FIG. 2 shows another embodiment of the present invention, which differs from the previous embodiment in that instead of interlocking the controller 22 with the fan switch 23, the mix door 1
Power servo motor 2 that performs opening adjustment control of 3.
Sliding resistance 2 for position detection to be linked to the movement of 4.
5 is attached, and a minute current signal for controlling the power consumption of the sub-motor 20 is generated depending on the position of the mixer door 13.

According to this embodiment, when the mix door 13 is at the intermediate position E, the power consumption in the sub motor 20 increases, the main motor 4 rotates at a low speed, and the air volume decreases. At this intermediate position E, air mix is most needed, so the sub motor 2
The high speed rotation of zero is very effective.

As explained above, according to the present invention, the electric power that was conventionally wasted due to lowering the terminal voltage of the main motor when the main motor rotates at low speed can be used to rotate the sub motor 20 as the air mixer fan driving motor. Since it is used for the sub-motor 20, no additional power is required for rotating the sub-motor 20, which is economical. In addition, air mixing can be performed reliably at low air volumes when air mixing is required, and comfortable air conditioning can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of an air conditioner for an automobile according to the present invention, and FIG. 2 is a longitudinal sectional view showing another embodiment. 4...Main motor, 5...Fan, 10...
Evaporator, 12...Heater core, 13...Mix door, 20...Sub motor, 21...Air mix fan, 22...Controller, 23...Fan switch, 24...Servo motor, 25...
Sliding resistance for detecting mix door position.

Claims (1)

[Scope of utility model registration request] A main motor that takes in air, and a mixer door that allows part of the air from the cooler unit to pass through the heater core and sends other air into the passenger compartment without passing through the heater core, mixing the two to produce air at an appropriate temperature. In the automotive air conditioner equipped with the above, an air mix fan for promoting air mix is provided in the air mix chamber near the mix door, and a sub motor for driving this fan is connected in series with the drive electric circuit of the main motor. An air conditioner for an automobile, characterized in that the speed of the main motor is controlled by controlling the sub motor.