JPS60146712A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To aim at the promotion of labper-saving operation, by making the work setting temperature of a compressor into being variable in time of an economy mode, while linking its adjustment up with the opening of an air mix door, in case of an air-mix type car air conditioner. CONSTITUTION:Air blown out of a blower 9 flows in a first air passage 6, and turns to cold air by cooling of an evaporator 10 in the midway, while partial air, commensurate to the opening of an air mix door 19, in the said air flowing in the first air passage 6 flows in a second air passage 7 and turns to warm air by heating of a heater core 17 where cooling water of an engine 16 flows, in the midway, while the cold air out of the said evaporator 10 and the warm air out of the heater core 17 both are mixed at an air mix chamber 5, then blown to the inside of a car from a blow-off port, thus air conditioning takes place. When an economy mode switch 25 is turned to ON, that is, when the air conditioning is performed upon checking the actuation of a compressor 13, work setting temperature in the compressor 13 is made to be variable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner installed in a vehicle, and particularly relates to an air conditioner equipped with an economy mode operation function that can save power of a compressor. be.

(Prior Art) Conventionally, this type of vehicle air conditioner equipped with an economy mode operation function was developed, for example, in Japanese Utility Model Publication No. 57-544.
The one disclosed in Publication No. 11 and the like is known. That is, this one is downstream of the evaporator, 11i! It is equipped with a temperature detection element that detects the air temperature of the air, and a control amplifier that receives an electric signal from the temperature detection element and controls the compressor driven by the engine. Ya rainy weather W! When the normal mode is set to J, etc., the operating temperature of the compressor is kept constant so that the temperature of the cold air passing through the evaporator is kept at a low temperature of, for example, 0 to 3"C, and in that state it is linked with the ms setting lever. Air mix operation is performed in which a portion of the cold air is heated by the heater core in accordance with the opening degree of the door and mixed with the remaining cold air. When set to the mode, the degree of cold flAm from the evaporator is higher than the normal mode, e.g.
By performing air mix operation at a constant operating temperature of the compressor (maintaining the temperature at 13°C), it is possible to reduce the operating time of the compressor in economy mode and save power. This is how it was done.

However, in this product, the compressor operation is set so that the temperature of the cold air from the evaporator is higher in economy mode than in normal mode. Since only the traces are changed, the compressor needs to be operated even if the vehicle occupant sets a relatively high air blowing temperature, and therefore there is a limit to the reduction in compressor operating time.

(Object of the Invention) The present invention has been made in view of the above points, and its object is to provide an air mix type vehicle air conditioner as described above! a
To make the operating set temperature of a compressor that determines the temperature of cold air from an evaporator variable during economy mode in the ill, and to appropriately link the adjustment of the operating set temperature of the compressor and the opening degree adjustment of an air mix door. Therefore, it is an object of the present invention to promote power saving by reducing the operating time of a compressor in an economy mode of a vehicle air conditioner as much as possible.

(Structure of the Invention) r In order to achieve the above object, the structure of the vehicle air conditioner of the present invention includes an evaporator, a first air passage communicating with an air mix chamber, a heater core, and a heater core. a second air passage branched from the first air passage and communicating with the air mix chamber; an air mix door that is attached to the upstream side of the heater core of the second air passage and opens and closes to adjust the flow rate of air passing through the heater core; It is an air mix type mother-in-law equipped with a temperature-sensitive switch device installed near the downstream side of the evaporator to detect the temperature of the cold air cooled by the evaporator, and the temperature-sensitive switch. The detection temperature of the device is variable,
The operating set temperature (men-off set temperature) of the above compressor, which is controlled according to the output of the temperature-sensitive switch device, is variable.
It is equipped with a mode switching device that sets the economy mode, and a blowout temperature regulator that changes the air blowout temperature by changing the opening degree of the air mix door. The temperature is adjusted in conjunction with the operation of the Suita temperature control means, and the air mix door is kept fully open when the temperature set by the temperature adjustment means is within a predetermined range on the low temperature side. It is something.

As a result, in the normal mode, the temperature of the cold air from the evaporator is kept constant and the air blowing temperature is adjusted by the opening degree of the air mix door, and in the economy mode, the cold air from the evaporator I! The temperature is made variable by a blowout adjustment means for adjusting the opening degree of the air mix door, and a dead zone is provided to keep the air mix door completely on the low temperature side of the temperature set by the blowout temperature adjustment means.

(Effects of the Invention) Therefore, according to the present invention, when the vehicle air conditioner is in the economy mode, the air mix door changes the operating set temperature of the compressor that determines the heating of cold air from the evaporator by the blowout temperature adjustment means. The air mix door is adjusted in conjunction with the opening degree of the air conditioner, and the air mix door is fixed in the closed state at the low temperature side of the set temperature of the Suita temperature adjustment means. It is possible to reduce the operating time of the compressor and save power. In addition, since the operating set temperature of the compressor is adjusted by the blowout temperature adjustment means,
The operating mechanism is simplified and operability can be improved.

Furthermore, since the air mix door is fixed in the closed state at the low temperature side of the temperature set by the blowout temperature adjustment means, by avoiding changes in the closing range of the air mix door, the cold air area in economy mode can be adjusted to the requirements of the passengers. You can finely match it.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a schematic structure of a vehicle air conditioner according to an embodiment of the present invention. Reference numeral 1 denotes a case of the air conditioner attached to the vehicle body, and the case 1 includes a case near the chest area of a vehicle occupant. and a chest suita outlet 2 and a foot outlet 3 that blow out air near the feet, and a defroster outlet 1 (not shown) that blows air toward the windshield of the vehicle;
Air inlet 4 connects air inside and outside the vehicle inside case 1 [11 persons]
is opened. In addition, inside the case 1, there is an air mix chamber 5 which communicates with the chest outlet 29, the foot outlet 3 and the defroster outlet, the upstream end of which is connected to the air inlet 4, and the downstream end of which is connected to the air mix chamber 5. A first air passage 6 communicating with each other and a second air passage 7 whose upstream end is branched and connected to the middle of the first air passage 6 and whose downstream end communicates with the air mix chamber 5 are formed. A motor 8 is installed near the air inlet 4 of the air passage 6.
A floor 9 driven by the blower 9 is operated to draw air into the case 1 from the air inlet 4 and send it to the air mix chamber 5 through the first and second air passages 6°7. The air is then blown into the vehicle interior from the chest air outlet 29, the foot air outlet 3, or the defroster air outlet.

Further, an evaporator 10 (evaporator) is disposed upstream of the branching point between the first air passage 6 and the upstream end of the second air passage 7, and the evaporator 10 has two condensers 11 (
The compressor 13 is connected to a compressor 13 via a refrigerant pipe 12 provided with a refrigerant (condenser), and the compressor 13 is equipped with an electromagnetic clutch 14 (cooler relay) and a belt 1 for intervening the driving force.
The on-vehicle engine 16 is drivingly connected through the engine 16, and the refrigerant gas is compressed by the operation of the compressor 13 driven by the engine 16, and is condensed and liquefied in the condenser 11, and then evaporated in the evaporator 10. The air flowing through the first air passage 6 is cooled using the heat of vaporization of the refrigerant at °C.

Further, a heater core 17 through which cooling water for the engine 16 flows is disposed in the middle of the second air passage 7, and the heater core 17 heats the air flowing through the second air passage 7.

Further, an air mix door 19 is swingably attached to the upstream side of the heater core 1 of the second air passage 7 and is drivingly connected to an actuator 18.
Reference numeral 9 opens and closes the second air passage 7 so as to adjust the flow of air passing through the heater core 17 by the operation of the actuator 18.

Furthermore, a temperature-sensitive switch device 20 consisting of a thermistor is located near the downstream side of the evaporator 1O in the first air passage 6.
The temperature-sensitive switch N20 detects the temperature of the cold air cooled by the evaporator 10. Note that 21 is a vent door that opens and closes the chest air outlet 2 of the case 1, and 22 is a floor door that opens and closes the foot air outlet 3.

In addition, the defroster outlet is a defroster door (not shown).
It is opened and closed by

FIG. 2 shows a schematic configuration of a control system for controlling the operation of the compressor 13 and the air mix door 19, and 23 is the air blown out from the chest outlet 22, foot outlet 3, and defroster outlet of the case 1. This is a level setting device consisting of a volume for setting the Suita humidity of the vehicle, and is manually operated by the passenger inside the vehicle. In addition, 24 is a normal mode switch that is turned on by the passenger when operating the air conditioner in normal mode, that is, when operating the compressuna 13 to the maximum state to perform air conditioning such as cooling and dehumidification. mode, that is, when air conditioning is performed by suppressing the operation of the compressor 13, the economy mode switch is operated by the passenger to turn on the temperature setting device 232, the normal mode switch 24°], the economy mode switch 25, and the above-mentioned economy mode switch 24°. The temperature-sensitive switch device 20 is connected to a control unit 26 which receives outputs from these detectors and controls the actuator 18 for driving the air mix door 19 and the electromagnetic clutch 14 for operating the compressor 13. And the above both mode switch 24.25
and=1 Mode switching device 2 that switches the operation mode of the air conditioner using a part of the function of the control unit 26
7 is configured, and the mode switching device W127 switches the temperature-sensitive switch device 2o when the normal mode switch 24 is turned on.
A normal mode is set in which the detected temperature is constant and the operating set temperature of the compressor 13 (temperature at which the electromagnetic clutch 14 is engaged) is constant, which is determined according to the output of the temperature-sensitive switch device 2o. 25 is turned ON, an economy mode is set in which the temperature detected by the temperature-sensitive switch device 20 is made variable, and the operating set temperature of the compressor 13 is made variable.

Also, by some functions of the temperature setting device 23 and the control unit 26, the Suita temperature of the air from the chest outlet 2, the foot Suita outlet 3 and the defroster Suita outlet is controlled by changing the opening degree of the air mix door 19. A Suita concentration adjusting means 28 is configured to change the concentration.

Furthermore, when the air conditioner is operated in the economy mode, the control unit 26 adjusts the operating temperature of the compressor 13 in conjunction with the operation of the temperature setting device 23 of the Suita temperature adjustment means 28. , the air mix door 19 is held in the fully open position if the temperature set by the Suita temperature adjustment means 28 (temperature setting device 23) is within two predetermined ranges, wide and narrow, on the low temperature side. 2 Next, to explain the operation of the above embodiment, basically, the air blown from the blower 9 flows through the first air passage 6.
The air flows through the air and becomes cold air by cooling the evaporator 1O along the way, and a portion of the air flowing through the first air passage 6 according to the opening degree of the air mix door 19 flows through the second air passage 7. On the way, the heater core 17 is heated to turn into warm air, and the cold air from the evaporator 10 and the hot air from the heater core 17 are mixed in the air mix chamber 5, and are air-mixed from the chest Suita mouth 2°, the foot Suita [13 and the defroster outlet to the vehicle]. Air conditioning is performed by blowing into the room.

In this case, the compressor 13 and air mix door 19 for force-feeding high-pressure refrigerant to the F evaporator 10 are controlled along flowcharts not shown in FIGS. 3 and 4, respectively.

That is, in the operation control of the compressor 13, as shown in FIG. 3, in the first step S+ after the start, it is determined whether the normal mode switch 24 is turned on and the air conditioner is operated in the normal mode. A determination is made, and if this determination is YES, the process moves to step Ss and normal control of the compressor 13 is performed. In this normal control of the compressor 13, the temperature detected by the temperature-sensitive switch device 20 is kept constant at, for example, 1°C, and the operating set temperature of the compressor 13 is maintained at a constant temperature, ie, the electromagnetic clutch 14.
The intermittent set temperature is 1°C, and as a result, the temperature of the cold air cooled by the evaporator 10 is maintained at a constant temperature of 1″C.

On the other hand, if the determination in step S1 is No due to the OFF state of the normal mode switch 24, step S
In step S2, the economy mode switch 25 is turned ON and it is determined whether the air conditioner is being operated in the economy mode or not. If this determination is NO, the process moves to step S3 and the operation of the compressor 13 is stopped. .

Further, when the determination in step S2 is YES due to the ON operation of the economy mode switch 25, the process moves to step S4, and power saving control of the compressor 13 is performed. In this power-saving control of the compressor 13, the temperature detected by the temperature-sensitive switch device 20 is, for example, 5°C as the set temperature in the temperature setting device 23 of the Suita temperature adjustment means 28 increases from the low temperature side to the high temperature side. Since the temperature of the cold air cooled by the vaporizer 1o is adjusted according to the operation of the temperature setting device 23, the operating temperature of the compressor 13 is also variable. As the temperature setting device 23 is operated from the low temperature side to the high temperature side, the temperature changes to increase from 5°C.

On the other hand, in controlling the air mix door 19, as shown in FIG.
'+, it is determined whether the air conditioner is operated in the normal mode or not, and if this determination is YES, the process moves to step S' y, and the air mix door 1 is opened.
9 is controlled so that the opening degree increases from a fully open state to a fully open state as the air blowing set temperature in the temperature setting device 23 changes from a low temperature side to a high temperature side.

On the other hand, if the determination in step S'+ is NO, it is determined in step S'2 whether or not the air conditioner is being operated in the economy mode, and if this determination is No, the above procedure is performed. Similarly, step S'
y, the air mix door 19 is controlled in the normal mode.

On the other hand, if the determination in step S'2 is YES due to the O/N operation of the economy mode switch 25, step S'2. Then, it is determined whether or not the Suita mode of the air is in the vent mode, that is, the floor door 22 is closed and the vent door 21 is inquired to determine whether or not the air is in the ventilation mode in which air is blown out from the chest Suita opening 2 into the passenger compartment. A determination is made, and if the determination is YES, the process moves to step S's and the air mix door 19 is controlled to open and close in the second cold side fixed mode. In the air mix door control using this second cold side fixed mode, ir! When the temperature set by the X setting device 23 is within a relatively wide second setting range on the low temperature side, the air mix door 19 is fixed at the fully open position, and the temperature is in a range exceeding the second setting device r. At times, the air mix door 19 is controlled so that its opening degree increases in accordance with a rise in the set temperature.

Further, if the determination in step 313 is NO due to non-operation in vent mode, step S'
Shift to 4 and determine whether the air's Suita mode is in the pie level mode, Zunawara □<>+7do721"
Half-open''''J') 7 g 7 F 7221fi
1Jfl, it is determined whether or not the mode is such that cold air is blown from the chest Suita outlet 2 and warm air is blown from the restoration outlet □3. If this determination is YES, the process moves to step S's and the air is blown out. The opening/closing of the mix door 19 is controlled in the first cold side fixed mode. In this first cold-side fixed mode-based one-Y amic store control, when the set temperature of the temperature setting device 23 is on the low-temperature side and is within the first setting range narrower than the second setting range, the air mixer is The door 19 is fixed at the fully open position, and when the temperature exceeds the first setting range, the opening degree of the air mix door 19 increases in proportion to -[rise of the set temperature.

Further, when the determination in step S'4 is N'O, the process moves to step S's and the air blowing mode is set to
~ Judgment of whether it is in mode or not, Zunawachi vent door 21
It is determined whether or not the heating mode is in which the floor door 22 is closed and the floor door 22 is opened and warm air is blown out from the Suita exit 3 at the foot of the vehicle.
When this determination is YES, the above step S' y
Then, the air mix door 19 is controlled in the normal mode. On the other hand, the determination in step S'5 is No.
When this is the case, it is determined in step 316 whether or not the air blower is in the differential mode, that is, the vent door 2
1 and the floor door 22 are both closed and air is blown out from the defster outlet. If this determination is YES or NO, the process moves to step S' yk and the normal mode is entered. The air mix door 19 is controlled by.

When the above-described operation control of the compressor 13 and opening/closing control of the air mix door 19 are combined,
When the operation mode of the air conditioner is in the economy mode, the air blown out from each air outlet 2 and 3 is
The temperature control characteristics are as shown in the figure.

Therefore, in this embodiment, when the air conditioner is operated in the economy mode, the operating set temperature of the compressor 13 is raised or raised according to the change in the set temperature at the temperature setting device 23, and the temperature setting device 23 is within a predetermined range on the low temperature side (the first and second setting ranges), the air mix door 19 is fixed at all III positions, so the operating time of the compressor 13 is reduced compared to conventional ones. It is possible to significantly reduce the power consumption and promote power saving.

In addition, in the economy mode, the adjustment of the operating temperature of the compressor 13 and the operation of the temperature setting device 23 for setting the air blowing temperature are performed in conjunction with each other, so the operation mechanism does not become complicated as would be the case if they were performed separately. Therefore, the operability of the air conditioner can be improved.

Furthermore, since the starting point of the opening operation from the fully open position of the air mix door 19 in the economy mode changes according to the switching of the 1A blowout mode, the cold air region with low air blowout thirst marks can be adjusted in detail to the demands of the occupants. I can do it.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a schematic configuration diagram of an air conditioner, Fig. 2 is a block diagram showing a control system, Fig. 3 is a control flowchart for a compressor, and Fig. 4 is a block diagram showing a control system. 5 is a control flowchart for the air mix door, and FIG. 5 is an explanatory diagram showing the air blowing temperature characteristics in the economy mode. 2... Chest outlet, 3... Feet outlet, 5... Air mix chamber, 6... First air passage, 7...
21st passage, 9... Blower, 10... Evaporator, 13... Compressor, 14... Electromagnetic clutch, 16... Engine, 17... Heater core, 18...
...Actuator, 19...Air mix door, 2
0...Temperature-sensitive switch device, 23...Temperature setting device, 2
4... Normal mode switch, 25... Economy mode switch, 26... Control unit, 27
...Mode switching device. (28... Blowout temperature adjustment means.

Claims (1)

[Claims] (1) A first air passage having an evaporator and communicating with the first air mix chamber; and a second air passage having a heater core and branching from the first air passage and communicating with the air mix chamber; , an air mix door that is attached to the upstream side of the heater core in the second air passage and opens and closes to adjust the flow rate of air passing through the heater core; and an air mix door that is attached near the downstream side of the evaporator and cooled by the evaporator. A temperature-sensitive switch device that detects the temperature of the cold air; and a variable detection temperature of the temperature-sensitive switch device;
A mode switching device sets the operating temperature of the compressor, which is controlled according to the output of the temperature-sensitive switch device, to an economy mode; It is equipped with a blowout MAW4 adjustment means that changes the Suita temperature, and when in economy mode, the compressor operating set temperature can be adjusted by adjusting the blowout hot water temperature,
The air mix door is configured to be held in the fully closed position when the set temperature of the temperature adjustment means is within a predetermined range on the low temperature side. Vehicle air peace device.