JPS6242813Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a so-called air mix type automobile air conditioner that adjusts the temperature by changing the mixing ratio of cold air and hot air using an air mix damper.

FIG. 1 shows an outline of the structure of a general automobile air conditioner, and FIG. 2 shows a conventional electrical wiring diagram for operating this automobile air conditioner.

In FIG. 1, air flow is indicated by arrows.

That is, the air that is circulated or introduced from the outside by the inside/outside air switching damper 1 is transferred to the fan motor 3.
After passing through the cooling heat exchanger 4 by the fan 2 driven by The air is divided into air that does not pass through the device 6 (bypass), and the two airs are mixed and temperature-controlled downstream. Reference numerals 7 and 8 designate blowout mode dampers for branching and blowing out air after air mixing to a ventilation duct 9, a footwell blowout duct 10, a rear seat footwell blowout duct 11, and a defroster duct 12, respectively. The air whose temperature is controlled by the air mix damper 5 is blown out into the vehicle interior 20 through each blow-off duct according to the occupant's preference. Regarding the air mix damper 5 in FIG. 1, the symbol H indicates the MAXHOT position, and the symbol C indicates the MAXCOOL position.

This system has conventionally been controlled by a circuit shown in FIG. That is, when the ignition switch 15 of the vehicle is turned on, the relay 14 for the fan motor 3 is excited by the power battery 13, and the relay contact 18 is closed. When the fan switch 19 is turned on to L (low speed), the fan motor 3 is driven from the power battery 13 via the fuse 16, fan switch 19, and resistors 21, 22, and the fan 2 rotates at a low speed. When the fan switch 19 is set to M (medium speed) or H (high speed), the resistance 22
Voltage is applied to the fan motor 3 only or not through the resistors 21 and 22, and the fan 2 rotates at a medium or high speed. 23 is an air conditioner switch, a cooling compressor (not shown)
ON-OFF control of the magnetic clutch 27. 24 is a thermostat that prevents the cooling heat exchanger 4 from freezing. Air conditioner switch 23 closed,
If the thermostat 24 is closed, the magnetic clutch relay 25 is energized, the relay contact 26 is closed, and the magnetic clutch 27 is connected to a compressor (not shown), which rotates at a rotation speed (pulley ratio) corresponding to the engine rotation speed. It will go around. In this case, as shown in FIG. 3, the pulley ratio is constant regardless of the position of the air mix damper 5.

The conventional system described above has the following drawbacks. That is, ON-OFF control of the compressor depends on the air conditioner switch 23, fan switch 19, and thermostat 24, and normal temperature control is performed by adjusting the mixing ratio of cold and warm air using the air mix damper 5.

Therefore, even in conditions such as mid-season and winter when the cooling load decreases and the position of the air mix damper 5 deviates from MAX COOL and the amount of reheat from the heating heat exchanger 6 increases, the compressor is turned on, reducing fuel consumption. becomes worse.

When the load is low, the pulley ratio is constant and the capacity of the compressor becomes excessive, which upsets the balance of the refrigeration cycle (not shown), resulting in an increase in power, resulting in poor fuel efficiency and poor drive feeling.

The present invention has been made for the purpose of eliminating the above-mentioned conventional drawbacks and providing an air conditioner for an automobile that improves fuel efficiency and drive feeling.

Embodiments of the present invention will be described in detail below with reference to FIGS. 4 to 10.

FIG. 4 shows an electrical wiring diagram of an embodiment of the automobile air conditioner according to the present invention. Note that in FIG. 4, the same parts as in FIG. 2 are given the same reference numerals, so a description of those parts will be omitted. In this embodiment, a two-speed clutch 33 is used as a multi-speed clutch.
We will explain the case where . 29 and 30 are control relays provided corresponding to the high-speed side magnetic clutch 33a and low-speed side magnetic clutch 33b of the two-speed clutch 33, respectively;
The relay contacts are shown at 31 and 32, respectively. Reference numeral 28 denotes a changeover switch for changing over the above-mentioned relays 29 and 30, the details of which are shown in FIG. The changeover switch 28 is the high-speed side magnetic clutch 33
A fixed contact 28a controls a relay 29 for driving a fixed contact 28a that controls a relay 30 for driving a low speed side magnetic clutch 33b.
b. Fixed contact 28 connected to power battery 13
c. It is composed of a movable contact 28d that interlocks with the air mix damper 5 shown in FIG. In addition, each fixed contact 28a is connected to the air mix damper 5.
MAX COOL (stroke S _C ) ~ (stroke
_S1 ), 28b is arranged at _S1 to _S2 , and 28c is arranged at MAX COOL _SC to MAX HOT _SH . Movable contact 28d is MAX COOL S _C ~
MAX HOTS _H electrically connects fixed contacts 28a and 28c and 28b and 28c.
Note that if the movable contact 28d is between S ₂ and MAX HOT _SH , there is no electrical connection between 28a, 28b and 28c.

Next, the operation of the device of the present invention configured as described above will also be explained.

When the fan motor 3 is rotating and the air conditioner switch 23 is turned on and the thermostat 24 is closed, voltage is applied to the relays 29 and 30.

Now, air mix damper 5 is MAX COOL S _C
When set between ~ _S1 , the movable contact 28d
Fixed contacts 28a and 28c are electrically coupled, and relay 29 is energized. As a result, the relay contact 31 closes and the high-speed side (high pulley ratio) magnetic clutch 33a of the 2-speed clutch 33 is closed.
is driven, and the compressor (not shown) is driven by the sixth
As shown in Figure A, it rotates at a high pulley ratio.

The cooling load decreases and the air mix damper 5 becomes S _1.
-S2 , the movable contact 28d electrically couples the fixed contacts 28d and 28c and releases the electrical coupling between the fixed contacts 28a and 28c, so the relay 30 is energized and the relay 29 is released. be done. As a result, the relay contact 32 is closed, the low speed side (low pulley ratio) magnetic clutch 33b of the two-speed clutch 33 is driven, and the compressor rotates at the low pulley ratio as shown in FIG. 6B.

If the cooling load further decreases and the air mix damper 5 is set between S ₂ and MAX HOT _SH ,
Since the movable contact 28d is not electrically coupled to either the fixed contacts 28a or 28b, the relays 29, 3
0 will not be excited. As a result, both relay contacts 31 and 32 are open, and neither the high-speed side magnetic clutch 33a nor the low-speed side magnetic clutch 33b of the two-speed clutch 33 is driven, and the compressor does not rotate.

As described above, FIG. 7 shows the rotary pulley ratio of the compressor and the ON-OFF control state, which change according to the stroke of the air mix damper 5.

With the configuration and operation described above, the compressor operation rate increase, which has been a problem with conventional systems, can be resolved by detecting the stroke position of the air mix damper 5 and turning off the compressor when the cooling load is low.

In addition, the air mix damper 5 also addresses the drawbacks of conventional systems, such as the compressor capacity being excessive at times of low load, causing an imbalance in the refrigeration cycle, increased power, and deterioration of drive feeling.
This is improved because the two-speed clutch is switched by detecting the position of the clutch.

As described above, since the compressor is shifted and turned on and off in stages according to the cooling load (air mix damper position), a power-saving automobile air conditioner with improved feeling can be realized.

Next, another embodiment of the present invention will be described.

An electrical wiring diagram of another embodiment of the present invention is shown in FIG. 8, in which the same parts as in FIG. 1 are denoted by the same reference numerals. In this case as well, a two-speed clutch 33 is used as the multi-speed clutch. The changeover switch 34 allows the air mix damper 5 to
When in the MAX COOL position, contact 34a is closed,
(At this time, the contact 34b is open.) When the air mix damper 5 is in any other position, the contact 34b is closed. (At this time, the contact 34a is opened.) The changeover switch 35 has the following details as shown in FIG.
Fixed contacts 35a, 35b, air mix damper 5
It is composed of a movable contact 35c that interlocks with the movable contact 35c.

The fixed contact 35a is located within the range of MAX COOLS _C to MAX HOTS _H of the air mix damper 5, and is connected to the power battery 13 on one side.

Movable contact 35c is MAX COOLS _C ~ MAX
It is slidable between HOTS _H and electrically connected to fixed contacts 35a and 35b between MAX COOLS _C and _S3 . Contact 35c between S ₃ and S _H MAX HOT
There is no electrical connection between the contact points 35a and 35b.

In such a configuration, air conditioner switch 2
3, voltage is applied to relays 29 and 30 for two-speed clutch 33 if thermostat 24 is closed.

Currently, the cooling load is large, and the air mix damper 5
Consider the case where is set to MAX COOLS _C. At this time, the contact 34a of the changeover switch 34 is closed, and the contact 34a is closed.
4b is open, so among relays 29 and 30,
Only 29 relays are energized. Therefore, the relay contact 31 is closed, the high-speed side magnetic clutch 33a of the two-speed clutch 33 is driven, and the compressor (not shown) is rotated at a high pulley ratio as shown in FIG. 6A.

As the cooling load decreases, the air mix damper 5 reaches, for example, the stroke S _C MAX shown in FIG.
If set between COOL and S ₃ , selector switch 3
No. 4 contact 34a is open and contact 34b is closed. In addition, the movable contact 35c allows the fixed contact 35
a, 35b are electrically coupled, and the fixed contact 3
Since 5b is connected to the power battery 13, the relay 30 is energized and the relay contact 32 is closed. Since the contact 34a of the changeover switch is open, the relay 29 is de-energized and the relay contact 31 is open. Therefore, the high speed side magnetic clutch 33a
is turned OFF, and the low speed side magnetic clutch 33b is turned OFF.
When turned on, the compressor operates as shown in Figure 6B.
It will rotate with a low pulley ratio.

If the cooling load further decreases, for example, the air mix damper 5 will change the stroke S ₃ to S _H in FIG.
If it is between MAX HOT, the movable contact 35c is disconnected from the fixed contact 35a, so the relay 30 is de-energized, the relay contact 32 is opened, and the low-speed side magnetic clutch 33b is turned OFF. the result,
Compressor does not rotate.

Fig. 10 shows the compressor speed pulley ratio and ON-OFF changes for the above air mix damper stroke. From FIG. 10, when the air mix damper 5 is located at MAX COOLS _C , the compressor rotates with a pulley ratio r ₁ , so it can respond to a large cooling load. On the other hand, if the air mix damper 5 moves to the MAX HOT (stroke S _H ) side, the pulley ratio is switched to r ₂ and a compressor capacity commensurate with the cooling load is obtained. Furthermore, when the air mix damper 5 moves toward the MAX HOT side and reaches the stroke S ₃ to S _H MAX HOT, the compressor stops.

Due to the above action, the compressor speed is changed from ON to OFF according to the cooling load (air mix damper position).
Since this can be done in stages, it is possible to realize an automotive air conditioning system that saves power and improves the feeling. Furthermore, by increasing the number of stages of the multi-stage speed clutch and the number of corresponding relays and changeover switches, more fine-grained adjustment becomes possible.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing an overview of an automotive air conditioner, Figure 2 is a conventional electrical wiring diagram for operating an automotive air conditioner, and Figure 3 shows the air mix damper stroke and compressor in the conventional equipment. 4 is an electrical wiring diagram of an embodiment of an automotive air conditioner according to the present invention, and FIG. 5 is an enlarged explanatory diagram of a changeover switch used in the present invention. Fig. 6 is an explanatory diagram of the operation of the two-speed clutch used in the present invention, Fig. 7 is a characteristic diagram showing the relationship between the air mix damper stroke and the compressor speed pulley ratio in the device of the present invention, and Fig. 8 9 is an enlarged explanatory diagram of the changeover switch used in the embodiment shown in FIG. 8, and FIG. 10 is an electrical wiring diagram of another embodiment of the present invention. FIG. 3 is a characteristic diagram showing the relationship between mix damper stroke and compressor speed change pulley ratio. 2... Fan, 3... Fan motor, 4... Cooling heat exchanger, 5... Air mix damper, 6...
... Heat exchanger for heating, 7, 8 ... Blowout mode damper, 23 ... Air conditioner switch, 24 ... Thermostat, 28 ... Selector switch, 29 ... Relay for high speed side magnetic clutch, 30 ... Low speed side Relay for magnetic clutch, 33...2 speed clutch.

Claims (1)

[Scope of utility model registration request] In an air mix type automobile air conditioner that adjusts the temperature by changing the mixing ratio of cold air and hot air using an air mix damper, a multi-stage speed clutch that changes the rotational speed transmission ratio from a drive source of a cooling compressor; A relay is provided corresponding to the multi-stage speed clutch and controls the clutch on and off, and a relay is linked to the air mix damper and turns on and off the relay according to the damper position.
An automotive air conditioner characterized by comprising a switch for turning off the air conditioner.