JPS58209612A - Car air conditioner - Google Patents

Abstract

PURPOSE:To enable energy-saving drive by controlling the outside-air intake volume by an intake door in linkage with a switching operation in a device to switch over the level of on/off operation room temperature of a compressor. CONSTITUTION:When an economy switch 6 for a control panel is on, a relay 11 is excited, while a thermistor 10 provided on the downstream side of an evaporator is switched over from a resistance 12A to ser the level of on/off operation room temperature of a compressor 8 to connect to 12B. Simultaneously, a reley 13 is excited to form an electrification circuit for a vacuum solenoid 15A regardless of the operational state of microswitches 14A and 14B by an intake lever 2. This construction gives a vacuum actuator 17A a negative pressure to switch an intake door 6 to a half-outside/half-inside position by the contracting operation thereof.

Description

[Detailed description of the invention] This invention is an energy-saving air conditioner for automobiles.

Especially energy-saving driving il? 11 control device.

As this type of air conditioner (hereinafter abbreviated as an air conditioner), for example, there is one in which the on/off operation room temperature level of a compressor that adiabatically compresses refrigerant vapor is switched between two stages by operating a switch. Figure 1 shows a conventional device.
In addition to the intake lever ~z, mts lever s, -y release lever ψ, and air conditioner switch 5, the compressor is turned on and off.
Economy switch 6 for off-operation room temperature level switching
This switch 6 is not incorporated into the compressor control circuit shown in the same (JfBl). A energizing circuit is provided to the magnetic clutch, and the Itj force of amplifier 8 is used to
Check the on/off control of JL/-7. The amplifier 9 turns the relay 7 on or off depending on whether the temperature-resistance detection output of a thermistor io provided on the rear air discharge side of the evaporator exceeds a set level. The thermistor 10 receives the compressor on/off operation room temperature level setting resistor 12A or 12B via the switching contact of the relay 11, and the output resistance of the thermistor ZO receives the resistor 1.
By applying a bias of 2 A or 12 B, the compressor v1 operating room temperature level is switched. The relay 11 is controlled to be turned on or off depending on whether the economy switch 6 is turned on or off.

In such a compressor control circuit, when the temperature resistance characteristic of the thermistor lO is as shown in FIG. Resistance value and resistance 12
When the sum of the resistance values of A and 12B exceeds the resistance value R, the relay 7 is turned off and the compressor 8 is stopped. Now, if the economy switch 6 is off and a resistor 12 A is connected to the thermistor 10, when the temperature of the thermistor 10 drops to T, its resistance R1 and the resistance rA of the resistor 12 A will be combined and broken. Set by m, R
o, the compressor 8 will stop operating. On the other hand, when the economy switch 6 is turned on, the resistor 12B is switched and connected to the thermistor 10, and the temperature of the thermistor 10 decreases by Ttt. *Compressor 8 will stop operating due to the combined resistance with rB. In other words, by turning on the economy switch 6, the timing of stopping the compressor 8 can be brought forward by the temperature difference 'r, -'r, which reduces the operating rate of the compressor 8 and improves vehicle winding costs. Enables energy-saving operation.

However, in such a conventional device, in energy-saving operation, the compressor operation is stopped while the temperature of the air discharged from the evaporator is high, so that the average value of the air conditioning temperature blown into the vehicle interior also increases.

For this reason, in economy mode, there may be insufficient cooling in midsummer, especially when intake lever 2 is set to the outside air intake side (FRES).
Insufficient cooling is likely to occur when operating in H).

To solve this insufficient cooling, return the economy switch 6 to the normal operation side or move the intake lever 2 to the internal air circulation side (RE
O), but the former does not result in energy-saving operation, and the latter requires an appropriate operation that takes into account the outside temperature and the combination with the economy switch 6, which causes trouble to the occupants.

The present invention has been made in view of the above-mentioned circumstances, and it simplifies operation by controlling the outside air intake lid by the intake door according to the switching of the room temperature level to turn on and off the compressor by operating the economy switch. The purpose of the present invention is to provide an air conditioner that enables energy-saving operation without insufficient cooling.

FIG. 3 is a control circuit diagram showing one embodiment of the present invention, and the same components or components having the same functions as those in FIG. 1 are designated by the same numbers. Economy switch 6 turns on relay 1 when it is turned on.
In addition to 1, relay 13 is turned on. The contacts of the relay port are connected in parallel to the microswitch 14. The micro switch 14A indicates that the intake lever 2 is in the outside air viewing position # (FRF!SH) and the inside air circulation position (FEO).
), the vacuum solenoid 15 is turned on when it is operated to the intermediate (semi-outdoor air, indoor air) position, or when it is operated to the inside air circulation position t''s, and this on khf'F- turns on the vacuum solenoid 15.
form a current-carrying circuit for the system. The micro switch 14B is turned on when the intake lever 2 is operated to the inside air circulation position, and this on operation turns on the Baki J solenoid 1.
5 Form a B energizing circuit. Therefore, when the economy switch 6 is turned on, the relay 13 is turned on together with the relay IJ.
Vacuum solenoid 15 regardless of the operating position of bar 2.
A energizing circuit is formed.

When the actuators 17A and 17B are used to switch between inside and outside air, the vacuum solenoid 15 is moved from the outside air intake position shown in the figure.
When negative pressure is applied to the actuator 17A by energizing A, the air is switched to half outside air and half inside air due to its contraction.
In this state, when a negative pressure is applied to the actuator 17B by energizing the solenoid 15B, its contraction causes a switch to internal air circulation. 18 is a vacuum tank, 1
9 indicates a fan for forcefully feeding the inside and outside air to the evaporator side.

In this way, by providing a relay contact that is turned on when the economy switch 6 is operated in parallel with the switch 14 that is turned on when the intake lever 2 is placed in the intermediate position or the inside air circulation position, the intake lever 2 is placed in the outside air position. Vacuum solenoid 15 for energy-saving operation
A is energized and the intake door 16 is operated to the half-outside/half-inside position to reduce the amount of outside air introduced. Therefore, even in energy-saving operation in midsummer when the outside temperature is high, the amount of outside air input is automatically reduced, and the problem of insufficient indoor cooling can be solved. The amount of outside air introduced is automatically controlled by operating the economy switch, making it easy to make adjustments for energy-saving operation.

Although the embodiment shows a case in which the contacts of the relay 13 are connected in parallel to the switch 14A, the amount of outside air intake can be adjusted by connecting the contacts in parallel to the switch 14B. In this case, when the intake lever 2 is in the half-outside air, half-inside air position, the intake door 16 is operated to the inside air circulation position, and when the lever 2 is in the outside air intake position, the intake door 16 is operated to the half-outside air, half-inside air position. , the amount of outside air intake is reduced by one step compared to the operating position of the intake lever 2, resulting in a two-step adjustment.

As described above, according to the present invention, it is possible to simplify the energy-saving operation and achieve an appropriate amount of outside air intake, thereby eliminating the problem of insufficient cooling.

[Brief explanation of drawings]

Figure 1 is a panel front view (A) and circuit diagram (B) showing a conventional energy-saving air conditioner, Figure 2 is a characteristic diagram to explain compressor operation/stop control, and Figure 3 is a booklet. FIG. 1 is a configuration diagram showing an embodiment of the invention. 2... Intake lever, 5... Air conditioner switch, 6... Economy switch, 8... Compressor,
9...Amplifier, 10...Thermistor, 14A, 14
B...Micro switch, 15A, 15B...Vacuum solenoid, 16...Intake door, 17A
, 17B... Vacuum actuator, 18... Vacuum tank.

Claims (1)

[Claims] J
An air conditioner for an automobile, characterized by comprising a circuit that controls the amount of outside air admitted through an intake door according to the operation of the switch.