JPS5823244B2 - Automatic air conditioner for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic air conditioner for a vehicle, and more particularly to control of an intake door that selects intake air.

In general, automatic air conditioners for vehicles such as automobiles (hereinafter referred to as "auto air conditioners") depend on the mode and temperature set by the control panel, the status of the intake switch, and signals from the inside temperature sensor and outside temperature sensor, etc. The auto amplifier outputs a signal to adjust the opening of the air mix door, controls the intake door to select the intake air, and controls each outlet door to select the outlet to cool and heat the vehicle interior. is automatically controlled.

□ In that case, the relationship between the air mix door position, the introduced air, and the outlet is generally as shown by the solid line in Figure 1.

In other words, when the air mix door is in the half-open position from the full cool (F/C) position, it introduces inside air or an appropriate ratio of inside air and outside air (this is called "semi-outside air"), operates the compressor, and cools it through the evaporator. Then, cool air is blown out from the instrument panel outlet to cool the vehicle.

In addition, the air mix door can be opened from the half-open position (Full Hola) (F
At the /H) position, outside air is introduced and heated through the heater coner, and warm air is blown out from the floor outlet to perform heating.

By the way, in such conventional automatic air conditioners,
When the outside temperature is low, for example, below 5° C., the operation of the compressor is stopped in order to enhance the medical protection and heating effect of the compressor.

Therefore, even if the outside temperature is low, if the temperature inside the vehicle is high and requires cooling, it is not possible to lower the temperature below room temperature.

Furthermore, when the outside temperature is low, there is a possibility that dehumidification cannot be performed and the window glass becomes foggy.

This invention was made to solve the above-mentioned problems, and when the compressor stops operating due to low outside temperature, the intake door is automatically set to the full outside air intake position or the half outside air intake position. Control is performed as shown by the dashed line or dashed line in FIG. 2), so that cold air can be blown into the passenger compartment by introducing outside air.

The present invention will be explained below with reference to the embodiment shown in FIG.

In the figure, 1 is an air introduction part of an automatic air conditioner, 2 is an outside air inlet, 3 is an inside air inlet, 4 is an intake door, and 5 is a blower.

The intake door 4 rotates together with the lever 6 by its rotation shaft.

One end of the lever 6 is rotatably supported by an operating punch of an actuator 7, and a spring 8 is engaged between the other end and a fixed portion to provide right-handed rotation.

Therefore, when the actuator γ is not operated, the intake door 4 is rotated to the position shown by the broken line by the biasing force of the spring 8, and enters the outside air introduction state.

The actuator 7 is in the actuation position, and depending on how it is pulled, the lever 6 rotates to the left, and the intake door 4 is in the semi-open air position shown by a phantom line or shown by a solid line.

It is rotated in two stages to the full internal position.

Reference numeral 9 denotes a solenoid valve, which is controlled by the output signal S1 of the autoamplifier 10 and supplies negative pressure from a negative pressure source to the actuator 7.

On the other hand, a compressor 11 circulates refrigerant to the evaporator 12 during operation to cool introduced air.

13 is a magnet that controls the operation of the compressor 11;
Clutch 14 is a relay that controls energization to the magnetic clutch, and consists of a relay coil 14a and a normally open relay contact 14b.

The relay coil 14a is controlled to be energized by the output signal S2 from the autoamplifier 10.

This is an outside temperature sensor using a 151d thermistor or the like.

Then, the temperature at which the outside temperature is determined by the outside temperature sensor 15,
For example, while it is detected that the temperature is 5° C. or higher, the auto amplifier 10 outputs an output signal S1 in accordance with various input conditions (not shown) to select the position of the intake door 4, similar to a conventional auto air conditioner. At the same time, the opening degree of the air mix door (not shown) is adjusted, and if necessary, the relay coil 14a is energized by the output signal S2 to close the contact 14b, and the magnetic clutch 13 is turned on to operate the compressor 11.

In this state, if the outside temperature drops below 5°C, the auto amplifier 10 turns off the relay 14 and turns off the magnet.
The clutch 13 is turned off and the operation of the compressor 11 is stopped.

At the same time, the supply of electricity to the solenoid valve 9 is cut off, rendering the actuator γ inoperative.

As a result, the intake door 4 is rotated by the biasing force of the spring 8 to the position shown by the broken line, and enters a state in which all outside air is introduced.

In this case, the voltage supplied to the solenoid valve 9 is lowered by one step to weaken the tension force on the actuator 7 and to reduce the tension on the intake door 4.
may be set to the semi-outside air introduction position shown by the imaginary line.

In addition, a contact that opens and closes in conjunction with the contact 14b of the relay 14 is provided and is interposed in the grounding circuit of the solenoid valve 9, so that when the relay 14 is turned off, the magnet
At the same time as cutting off the power to the clutch 13, the auto amplifier 1
The solenoid valve 9 may be de-energized regardless of the presence or absence of the signal S1 from 0.

□ As described above, according to the present invention, even when the outside temperature is low and the compressor is not operating, if the inside temperature of the vehicle is high and cooling is required, the air mix door can be set to the full cool side so that cold outside air can be removed. By blowing directly into the vehicle interior without going through the heater core, the temperature inside the vehicle can be quickly adjusted, and furthermore, the windows can be prevented from fogging, which is very preferable from a safety standpoint.

[Brief explanation of the drawing]

Fig. 1 H is an explanatory diagram showing the relationship between the air mix door inlet, the inlet, and the outlet in a conventional auto air conditioner, and the relationship between the inlet when the compressor stops operating according to the present invention; Fig. 2 is an embodiment of the present invention; FIG. 1... Air introduction part, 2... Outside air introduction port, 3... Inside air introduction port, 4... Intake door, 5... Floor,
7... Actuator, 9... Solenoid valve, 10... Auto amplifier, 11... Compressor,
12... Evaporator, 13... Magnetic clutch, 14... Relay.

Claims (1)

[Claims] 1. In a vehicle automatic air conditioner that automatically controls an intake door, an outside temperature sensor; and means for stopping the operation of a compressor when the outside temperature sensor detects that the outside temperature is below a predetermined temperature; An automatic air conditioner for a vehicle, comprising means for forcing the intake door to a full outside air introduction position or a partial outside air introduction position when the means is activated.