JPH04185524A - Air conditioning control device for vehicle - Google Patents

Abstract

PURPOSE:To provide fine control of gas quantity by applying minimum applied voltage necessary to rotate a blower motor set by a main changeover means in a positive direction to the blower motor after changing over to a reverse polarity by an auxiliary change-over means to regulate the gas quantity of a blower to an ultra low wind amount. CONSTITUTION:When the contact piece 60 of a change-over switch 50 is changed over to the first terminal 51 side in the gas quantity adjusting circuit 30 of an air conditioning device AC, applied voltage approximately equal to power supply voltage is applied to the positive polarity of a blower motor 1 through a line L1, a relay 32, a line L5, a relay 38, a line L6 and the change-over switch 50, and the blower motor 1 rotates in a positive direction at maximum rotational speed. When the change-over contact piece 60 of the change-over switch 50 is changed over to the second terminal 52 and the third terminal 53 sides in order, applied voltage is reduced step by step by a division resistance 45, so the rotational speed of the blower motor 1 goes down step by step. When the change-over contact piece 60 of the change-over switch 50 is changed over to the fifth terminal 55 side, the blower motor 1 rotates in a reverse direction, and the blower 2 blows off an ultra low wind amount.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner in which the air volume of a blower can be easily adjusted to an extremely low air volume.

[Prior art]

Generally, in a vehicle air conditioner, cool air or warm air is blown into the vehicle interior through a blower made of a sirocco fan, and when adjusting the air volume, as shown in FIG.
A blower motor 101 that drives a blower by operating an air volume selector switch 100 provided on the instrument panel.
By switching the dividing resistor 102 connected to , the applied voltage for rotating the blower motor 101 is switched, and the rotation speed of the blower motor 100 is switched in stages.

[Problem to be solved by the invention]

In the above-mentioned conventional air conditioner, the minimum rotation speed of the blower motor is regulated by the minimum starting voltage of the blower motor. When it is desired to adjust the air volume to an extremely low level, which is slightly lower than the air volume, there is a problem in that it is difficult to adjust the air volume to an extremely low level, and it is not possible to achieve more fine-grained air volume adjustment.

It may be possible to use a blower motor that can rotate at a rotation speed even lower than the above-mentioned minimum rotation speed, but such a blower motor is expensive and there is a problem in that the manufacturing cost of the air conditioner increases.

An object of the present invention is to provide a vehicle air conditioner that can adjust the air volume of a blower to an extremely low air volume with a simple configuration.

[Means to solve the problem]

The vehicle air conditioner according to the present invention switches the applied voltage that rotates the blower motor in the forward direction in multiple stages in order to stepwise switch the rotation speed of the blower motor that drives the blower made of a sirocco fan. The present invention is provided with a main switching means and an auxiliary switching means for switching the minimum applied voltage of the plurality of applied voltages to the opposite polarity and applying it to the blower motor.

[Effect]

In the vehicle air conditioner according to the present invention, when adjusting the air volume of the blower to an extremely low air volume, the minimum applied voltage for rotating the blower motor in the forward direction set by the main switching means is changed to reverse polarity by the auxiliary switching means. and apply it to the blower motor. At this time, the blower motor rotates in the opposite direction at the minimum rotation speed, and due to the performance characteristics of the sirocco fan, the blower blows an extremely low air volume that is lower than the lowest air volume when rotating in the forward direction at the minimum rotation speed. put out.

In this way, since the air volume of the blower can be adjusted to an extremely low air volume, more precise air volume adjustment can be achieved. Further, since only the auxiliary switching means is provided, the configuration of the air conditioner can be simplified and the device can be manufactured at low cost.

〔Effect of the invention〕

According to the vehicle air conditioner according to the present invention, the air volume of the blower can be adjusted to an extremely low air volume as explained in the [Function] section above, so that more detailed air volume adjustment can be realized, and the auxiliary switching Since only the means are provided, the configuration of the air conditioner can be simplified and the device can be manufactured at low cost.

〔Example〕

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

In this embodiment, the present invention is applied to an air conditioner for an automobile.

As shown in FIG. 1, the air conditioner AC includes an air conditioning unit 5 in which a blower 2 consisting of a sirocco fan driven by a blower motor 1, an evaporator 3, a heater core 4, etc. are combined into a unit, and a unit as a casing of the air conditioning unit 5. A main duct 7 extending from the duct 6, a differential duct 8, etc. are provided, a plurality of vent outlets 9 are provided at the downstream end of the main duct 7, and a midway portion of the differential duct 8 is provided with an upper surface of the instrument panel (as shown in the diagram). A pair of left and right defroster outlets 10 are provided at the downstream end of the defroster duct 8, and a pair of left and right side defroster outlets 11 are provided at the downstream end of the defroster duct 8.
The unit duct 6 is provided with a foot outlet 12 that blows warm air into the vehicle interior during heating.

The shutters 13, 14, and 15 are driven to open and close by an actuator 16, the shutters 17 and 18 are driven to open and close by an actuator 19, and an outside air intake port 20 and an inside air intake port 21 are provided in the intake section on the upstream side of the blower 2. Intake port 20
and an inside/outside air switching shutter 22 that opens and closes the inside air intake port 21.
is adapted to be opened and closed by an actuator 23.

Next, the air volume adjustment circuit 30 for adjusting the air volume of the blower 2 in five stages will be described.

As shown in FIG. 2, the power supply 31 of the blower motor 1 is connected to the common terminal 33 of the relay 32 via the line Ll, and the normally closed terminal 34 of the relay 32 is connected to the common terminal 33 of the blower motor 1 via the line L2 and line L3. The terminal 1a and the normal oven terminal 39 of the relay 38 are connected in parallel, and the normal oven terminal 35 of the relay 32 is connected to the terminal 1b of the blower motor l via a line L4.

The normally closed terminal 40 of the relay 38 is connected to the line L5.
The common terminal 41 of the relay 38 is connected to the first terminal 46 of the divided resistor 45 through the line L6, and the first to
The third terminals 46 to 48 are connected to the first to third terminals 51 to 53 of the air volume changeover switch 50 provided on the instrument panel, and the fourth terminal 49 of the dividing resistor 45 is connected to the third terminal 51 to 53 of the changeover switch 50 provided on the instrument panel. 4 and connected to the fifth terminals 54 and 55. Further, as shown in FIG. 3, the air volume changeover switch 50 has a switching contact piece 60
A sixth terminal 56 is provided which comes into contact with the switching contact piece 60 when the switch is switched to the fifth terminal 55 side.

The drive power source 65 for the relays 32 and 38 is connected to the drive coil 36 of the relay 32 via a line L7, and the drive coil 36 is connected to the drive coil 42 of the relay 38 via a line L8.
The drive coil 42 is connected to the sixth terminal 56 of the changeover switch 50 via line L9. still,
Reference numerals 37 and 43 are switching contacts of the relays 32 and 38, respectively, reference numeral 60 is a switching contact of the changeover switch 50, and reference numeral 57 is a seventh terminal for stopping the rotation of the blower motor 1.

The operation of the air conditioner AC configured in this way will be explained.

As shown in FIG. 2, the changeover contact piece 60 of the changeover switch 50
When switched to the first terminal 51 side, line L1, relay 3
2, line L2, line L5, relay 38, line L6
An applied voltage approximately equal to the power supply voltage or positive polarity is applied to the blower motor 1 via the changeover switch 50, and the blower motor 1 rotates in the positive direction at the maximum rotation speed, and the blower 2 rotates in the positive direction to achieve the maximum air volume. Blow out.

When the changeover contact piece 60 of the changeover switch 50 is sequentially switched to the second terminal 52 and third terminal 53 sides, the applied voltage applied to the blower motor l is gradually reduced by the dividing resistor 45, so that the rotation speed of the blower motor l is reduced. The number of rotations gradually decreases from the maximum rotation speed, and the air volume of the blower 2 gradually decreases. When the switching contact piece 60 is switched to the fourth terminal 54 side, the blower motor 1
The minimum applied voltage is applied, the blower motor 1 rotates at the minimum rotation speed, and the blower 2 blows out the minimum amount of air in the positive direction. Note that the minimum applied voltage is set approximately equal to the minimum starting voltage of the blower motor 1.

As shown in FIG. 3, the changeover contact piece 60 of the changeover switch 50
When switched to the fifth terminal 55 side, a drive current is supplied to the drive coils 36 and 42 of the relays 32 and 38 via the lines L7 to L9 and the changeover switch 50, and the relays 32 and 38
The switching contacts 37 and 43 are normally open terminals 35 respectively.
・It is switched to the 39 side, and the line L is connected to the blower motor 1.
tri-relay 32, line L4, line L2/L3, relay 38, line L6, dividing resistor 45, and changeover switch 50
A minimum applied voltage of opposite polarity is applied through the blower motor l to rotate in the opposite direction. At this time, blower motor 1
The blower 2 rotates at the same minimum rotational speed as when this minimum applied voltage is applied to the positive polarity, or due to the performance characteristics of the blower 2 consisting of a sirocco fan, the blower 2 rotates at an extremely low speed of, for example, about 70% of the minimum air volume. Blows out air volume.

In this way, since the minimum applied voltage of the blower motor 50 is switched to the opposite polarity and applied to the blower motor 5o, the air volume of the blower 2 can be adjusted to an extremely low air volume.
It is possible to realize fine-grained air volume adjustment.

In addition, since the air volume adjustment circuit 30 has a simple configuration in which relays 32 and 38 are additionally provided, the air conditioner AC can be manufactured at low cost.

[Modified example]

In the air conditioner of this modification, the fifth terminal 55 of the changeover switch 50 is omitted, and the air volume adjustment circuit 30A is configured to adjust the air volume of the blower 2 in four stages. Incidentally, members similar to those of the air volume adjustment circuit 30 are given the same reference numerals and explanations thereof will be omitted.

As shown in FIG. 4, the changeover contact piece 6 of the changeover switch 50A
0 to the fourth terminal 54 side, the switching contacts 37 and 43 of the relays 32 and 38 are respectively switched to the normal oven terminals 35 and 39 side, and the blower motor l has line Ll, relay 32, Line L4, line L2・
The minimum applied voltage or reverse polarity is applied via L3, relay 38, line L6, dividing resistor 45, and changeover switch 50A. Blows out an extremely low air volume that is lower than the air volume.

[Brief explanation of drawings]

1 to 4 show examples of the present invention, in which FIG. 1 is a configuration diagram of an air conditioner, FIG. 2 is a configuration diagram of an air volume adjustment circuit,
Fig. 3 is a diagram equivalent to Fig. 2 showing a state in which the changeover contact piece of the changeover switch is switched to the fifth terminal side, Fig. 4 is a configuration diagram of an air volume adjustment circuit according to a modified example, and Fig. 5 is a diagram according to the prior art. FIG. 3 is a configuration diagram of an air volume adjustment circuit. l...Blower motor, 2...Blower, 30.3
0A...Air volume adjustment circuit, 32, 38...Relay, 4
5...Divided resistor, 50/50A...selector switch,
AC...Air conditioner. Patent applicant: Mazda Motor Corporation Figures 2, 3, 4, 5

Claims (1)

[Claims] (1) In a vehicle air conditioner, in order to stepwise switch the rotation speed of a blower motor that drives a blower made of a sirocco fan, a main switching means that switches an applied voltage that rotates the blower motor in a positive direction in multiple stages; 1. A vehicle air conditioner comprising auxiliary switching means for switching the minimum voltage among the voltages applied to the stages to reverse polarity and applying the reverse polarity to the blower motor.