JPS5841205B2 - Control method and device for hot water cock and air mix door in automatic air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic air conditioner (
With regard to so-called automatic air conditioners, the hot water cock, which controls hot water supply to the heater core, and the air tank store, which controls ventilation to the heater core, are smoothly linked to prevent unnecessary movement of the air tank store. It is an object of the present invention to provide a control method and a control device for a lake water cock and an air mix door in an automatic air conditioner, which prevents temperature fluctuations and always performs drip-flowing air conditioning.

The air conditioner for an automobile to which this invention is applied has air outside the car (outside air) and air inside the car (inside air) as illustrated in FIG.
An evaporator 3 and a heater core 4 are disposed from the windward side in a casing 1 in which a fan 2 is provided near an intake port 1a provided with a damper 9 for controlling the intake of air. is provided with an air mix door 5 for controlling ventilation to the heater core 4 and ventilation to a passage bypassing the heater core 4.

In the illustrated example, two air mix doors 5 are interlocked with each other.
It is composed of nine dampers 5a and 5bc, and the damper 5
a and 5b, in the solid line position shown in the figure, the cold air sent from the fan 21/c and passed through the evaporator 3 is not sent to the heater core 4 at all, but is blown out from the ventilator outlet 1c into the car;
At the chain line position, all of the cold air is passed through the heater core 4, and at the intermediate position, a part of the air is passed through the heater core 4 depending on the state, and the warm air that has passed through the heater core 4 is mixed with the remaining cold air that has bypassed the heater core. After the temperature is set to an appropriate temperature, the air is blown into the vehicle from the ventilator outlet 1c or the heater outlet 1b.

A hot water cock 7 is provided in the middle of the vibro for supplying mixed water to the heater core 4, and the amount of hot water sent to the heater core 4 is controlled by the cock 7.

Each outlet of the casing 1 is provided with a damper 8.8 for controlling the blowing of conditioned air into the vehicle interior.

The automatic air conditioner is equipped with air□tux store 5 and each damper 8.
, 9, refrigerant supply control to the evaporator 3, and hot water supply control to the heater core 4, the interior of the vehicle is maintained at the temperature desired by the occupants.

In such an automatic air conditioner, the present invention opens the VC hot water cock 7 to supply mixed water to the heater core 4 when the temperature inside the vehicle starts to drop, and opens the air mix door 5 (as indicated by the arrow a). (Reverse Direction VC) The purpose is to perform the operation of starting ventilation to the heater core 4 smoothly and without causing discomfort to the occupant.

That is, conventionally, opening the flood cock and opening the air mix door 5
Since opening was started at the same time as opening, ventilation to the heater core 4 was started before it was sufficiently warmed up, and air cooler than the set temperature was delivered to the inside of the car from the heater outlet LB, ventilator outlet 1C, defroster output 1d, etc. is a speech bubble,
Not only does this cause discomfort to the occupants, but the temperature sensor installed at the air outlet is exposed to cold air, which causes the bridge circuit 15 to operate and cause the air tank store 5 and flooding cock 7 to open wider than necessary. As the heater core 4 warms up, it makes an unnecessary movement of returning to an appropriate position.

Hot water cock and air □ in the automatic air conditioner of the present invention
The control method and control device for the storage eliminates the above-mentioned drawbacks.

The present invention will be explained below with reference to drawings showing examples.

FIG. 2 schematically shows the configuration of an air conditioner for an automobile incorporating a control device according to the present invention.

The electrical circuit of the control device includes a bridge circuit 15 as shown in FIG.

That is, the power terminals 15a and 15b of the bridge circuit 15 are
Conductive wires 10a and 10b (including electrical paths formed by printed circuit board wiring).

The same buttons apply throughout this specification. ) is connected to the positive side and negative side of the DC power supply, and the power terminals 15a, 15b
, a fixed resistor 11.16 and a plurality of temperature sensors 12a to 1 are included in the bridge circuit 15 between the output terminals 15c and 15d.
2e>, a variable resistor 13 for setting the temperature inside the vehicle, and a compensation resistor 17 whose resistance increases when the air mix door 5 opens in the direction opposite to arrow a (FIG. 2).

Each of the temperature sensors 12a to 12e has a resistance value that decreases as the temperature increases (for example, a thermistor), and the second
As shown in the figure, it is installed at an appropriate location within the vehicle compartment 14 and outside the vehicle compartment 14.

The output terminals isc and isa of the bridge circuit 15 are connected to the control amplifier 20 by conductive wires 18 and 19, respectively.

The amplifier 20 has an output terminal 15e at a potential ■.

The conductor 21 corresponds to the difference between the potential of the output terminal 15d and
Transducer 23 by sending the output current to the housing or 22
It is what drives the.

For example, if the salinity inside the car becomes higher than the set salinity, resistance 1
3 and each of the salinity sensors 12a to 12e becomes small, and the potential of the output terminal 15c becomes ■.

becomes higher than the potential V of the output end crop 15d (■.

>V, ), the control amplifier 20 sends current through one conductor 21 to one coil 23a of the transducer 23 and to the valve 24 leading to the vacuum source of the transducer 23.
Open (Figure 2).

Therefore, negative pressure is introduced to the actuator 26 that drives the air □ storage 5 via the pipe 27, and the rond 28
is pulled to rotate the air mix door 5 in the direction of the arrow a in FIGS. 1 and 2 to prevent the cold air that has passed through the evaporator 3 from entering the heater core 4.

Therefore, cold air is blown out from the air outlet 1c of the air conditioner to lower the salinity inside the car.

As shown in FIG. 2, the variable resistor 11 connected to the bridge circuit 15 increases its resistance as the air mix door 5 rotates in the direction a and the amount of ventilation to the heater core 4 decreases. Since the value becomes smaller, as the air mix door 5 rotates, the potential () becomes higher, and when the door 5 rotates at an appropriate angle, the potential becomes V,=Vo,
Control amplifier 20 will no longer deliver current to the output conductor.

To change the set temperature, change the resistance value of variable resistor 13,
Potential ■.

This is done by changing the opening degree of the air mix door 5 when = ■.

Conversely, if the temperature inside the car becomes lower than the set temperature, the potential ■.

<■1, the control amplifier 20 sends a current to the conductor 22, opens the valve 25 on the side of the transducer 230 that communicates with the atmosphere, pushes the iron 28 of the actuator 26, and rotates the air □ tuck store 5 in the direction opposite to arrow a. After passing through the evaporator, the air is passed through the heater core 4 to blow relatively warm air into the vehicle.

The potential V changes as described above.

When Vl and Vl are represented in a graph, it becomes as shown in FIG.

■ Potential that changes in response to temperature changes.

changes linearly in direct proportion to the temperature, but the potential ■, which changes in response to the degree of opening of the air mix door 5, changes in direct proportion to the temperature only when the door 5 is in the opening/closing range. However, it does not change and maintains a constant value between when the air mix door 5 is fully open (portion A) and when it is fully open (portion B).

The present invention uses the electric potential that changes in this way. The opening and closing of the hot water cock 7 and the air mix door 5 are controlled using the characteristics of the hot water cock 7 and the air mix door 5.

In other words, when the temperature inside the car drops and the air conditioning that used to operate only by the cooler is switched to air conditioning that uses the cooler and heater together, conventionally the operation of opening the water mixing cock 7 was performed by opening the air mix door 5. Since the opening operation (ventilation to the heater core 4) was performed at the same time (the air mix door 5 begins to open and the hot water cock I begins to open when the potential ■ begins to decrease from the range A), hunting occurs as described above. This caused an unpleasant warm sensation.

The present invention utilizes changes in the potential ■o to change the potential ■.

When the potential is slightly higher than the potential at which the air mix door 5 starts to open (i.e. near point X in Figure 4), the water mixing cock starts to open, the air mix door 5 starts to open, and ventilation of the heater core 4 starts. Sometimes the heater core is already warmed to a sufficient salinity.

Potential ■ corresponding to point X in Figure 4.

To detect X and open/close hot water cock 7, fixed resistor 1
1 and the salinity sensor 12a, the potential ■o of the output terminal 15e is determined as the X point.

A conductor 33 is connected to a comparator circuit 29 configured to open (stop energizing) if the value is exceeded, and close (energize) if it is less than this value.
Accordingly, the above potential ■.

and an output terminal 1 between the fixed resistor 16 and the compensation resistor 17.
5d and the potential V1 is input.

The output of the circuit 29, which is generated when the difference between the The vacuum pressure applied is applied to the vacuum actuator 32 to open the water mixing cock 7.

As a result, the water mixing cock 7 has a potential ■.

■ was determined as the X point. It begins to open when it reaches the value of X, and continues to open when vo is less than that (vo<VoX).

The control method and control circuit for the lake water cock and the air mix door in the automatic air conditioner of the present invention are configured and operate as described above, so that hunting of the air mix door can be prevented and the occupants will not feel uncomfortable. It is effective as a device that can automatically condition the air inside the car without having to supply air.

In addition, when opening the mix door blocking the heater core to start ventilation to the heater core, an automatic air conditioner that starts water flow to the heater core a little before opening the mix door is described in Japanese Patent Publication No. 52-37858. However, this invention is an invention that prevents the air temperature from rising rapidly when the mix door starts to open, and is different from the above-mentioned invention in purpose, operation, and effect. .

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal side view illustrating the structure of an air conditioner to which the present invention is applied, FIG. 2 is a schematic diagram showing the control system of the present invention, and FIG. 3 is a schematic diagram of the electrical circuit of the control device. FIG. 4 is a diagram showing the relationship between the potentials Vo and V. 1: Casing, 3: Evaporator, 4: Heater core,
5: Air mix door, 7: i water cock, 11: fixed resistance, 12a to 12e: temperature sensor, 13: variable resistance, 1
5 bridge circuit, 15a. 15b, 15c, 15d: power supply terminal, 16: fixed resistance,
17: Compensation resistor, 29: Comparison circuit, 30: Amplifier, 31
: Solenoid valve, 32: Actuator.

Claims (1)

[Claims] 1. An air mixer that is located between the evaporator 3 provided on the windward side of the casing 1 and the heater core 4 provided on the leeward side and controls the amount of air sent to the heater core 4 and the amount of air that bypasses the heater core 4. a door 5, a water mixing cock 7 that controls the supply of mixed water to the heater core 4, and an air tank store 5;
In an automatic air conditioner having a control circuit that controls a hot water faucet 7, etc., a potential (2) that changes with temperature changes in the control circuit. A bridge circuit is provided to detect the potential V corresponding to the point in time when the air □ storage 5 opens and starts ventilation of the heater core 41/c. Regarding K, the potential ■. The potential before reaching K changes ■. Detects X and turns on hot water cock 7
A method for controlling a hot water cock and an air mix door in an automatic air conditioner, characterized in that the door is opened. 2. An air mix door 5 that is located between the evaporator 3 provided on the windward side and the heater core 4 provided on the leeward side in the casing 1 and controls the amount of air sent to the heater core 4 and the amount of air that bypasses the heater core 4; In an automatic air conditioner having a hot water cock 7 that controls mixed water supply to the air mix door 5 and the hot water cock 7,
There are two power supply terminals 15a, 15 in the control circuit that controls the
b is attached with a bridge circuit 15 connected to a DC power supply,
The bridge circuit 15 includes first and second fixed resistors 11.16.
, a temperature sensor 12a whose resistance value changes with temperature rise, a variable resistor 13 for setting the temperature inside the car, and an air mix door 5.
A compensating resistor 17 which balances the bridge circuit 15 by changing the resistance value when the door 5 is opened is connected to the output terminal 1 between the second fixed resistor 16 and the compensation resistor 17.
5d and the potential V of the output terminal 15c intermediate between the first fixed resistor 11 and the temperature sensor 12a. The latter potential V varies depending on the temperature. This potential vo at the time when the air mix door 5 starts to open
'VC, the potential V. A comparator circuit 29 is attached to the bridge circuit and outputs a signal by detecting a preset slightly higher potential that changes to . A control device for a mud water cock and an air mix door in an automatic air conditioner, characterized in that a solenoid valve 31 is provided to conduct pressure and start opening a water mixing cock 7.