JPH0618804Y2 - Air conditioner for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an air conditioner for vehicles such as passenger cars, buses, and trucks.

(Prior Art) A system configuration of a conventional vehicle air conditioner is shown in FIG. 4, and in FIG. 4, 1 is a compressor, which is rotationally driven from an engine 6 through an electromagnetic clutch 20. The refrigerant gas discharged from the compressor 1 enters the condenser 2 where the blower 23
After condensing and liquefying by radiating heat to the outside air blown by, it enters the expansion valve 4 via the receiver 3 and is adiabatically expanded by being throttled here. Next, it enters the evaporator 5, where it cools the air-conditioning air to vaporize itself and returns to the compressor 1. A heater core 7 circulates hot water whose temperature has been raised by cooling the engine 6. Reference numeral 8 is an air mix damper, the opening of which is adjusted by a motor 17, and the opening is adjusted by a potentiometer 18
Detected by. A blowout mode switching damper 9 has its opening adjusted by a motor 16, and the opening is detected by a potentiometer 15. An intake air switching damper 24 is switched by a motor 25. A blower 26 is driven to rotate by the motor 22.

The temperature inside the passenger compartment 27 detected by the room temperature sensor 11 attached to the upper portion of the passenger compartment 27, the outside air temperature detected by the outside air temperature sensor 12 attached to the outside air intake 28, and the upper portion of the instrument panel 34. Room temperature setting device 19 for setting the amount of solar radiation detected by the solar radiation sensor 13 attached, the temperature of the air drawn from the evaporator 5 detected by the temperature sensor 14 attached to the evaporator 5, and the temperature inside the passenger compartment 27. The set temperature set by, the damper opening detected by the potentiometers 15 and 18 are input to the controller 10, and the motors 16, 17, 22, 25 and the electromagnetic clutch 20 are controlled by the output signal from the controller 10. . In addition, 39 is an air conditioner switch.

Outside air inlet 28 opened and closed by the intake air switching damper 24
Alternatively, the outside air or the room air taken into the casing 30 from the room air intake 29 is sucked into the blower 26 to be energized, and then is passed through the evaporator 5 to be cooled. Next, after adjusting the temperature of the blown air by adjusting the amount of air flowing into the heater core 7 by the air mix damper 8, when the FACE blowout mode is selected according to the blowout mode selected by the blowout mode switching damper 9. Defrost blowout mode is selected from the upper blower outlet 31, from the lower blower outlet 32 when the FOOT blowout mode is selected, and from both the upper blower outlet 31 and the lower blower outlet 32 when the BI-LEVEL blowout mode is selected. When blown off, it is blown into the vehicle interior 27 from the defrost outlet 33.

(Problems to be Solved by the Invention) In the above-described conventional vehicle air conditioner, when the defrost blow-out mode is selected to remove or prevent the fogging of the windshield 35, the compressor 1 is automatically started to operate. The incoming air switching damper 24 is switched to suck the outside air. However, when the outside air temperature is low and the humidity is high, the compressor 1 does not start due to a frost protection device or the like, and when it is necessary to prevent the freezing of the front window 35, the temperature of the blown air is increased by a manual operation. However, since the general user does not know the necessity of this operation, the actual condition of running while wiping off the fog generated on the front window is required.

Further, when the outside air temperature is low, the FOOT blowout mode is automatically selected and the hot air blows out from the lower outlet 32 into the passenger compartment 27, and the temperature inside the passenger compartment 27 becomes the temperature set by the room temperature setting device 19. However, if the defrost blowout mode is selected in this state, warm air rises from the defrost outlet 33 along the front window 35 and warms up inside the cabin 27, so Room temperature sensor mounted on the ceiling of
11 detects this. Then, as shown in FIG. 5, the controller 10 calculates that the air conditioning load has decreased by the temperature increase Δa detected by the room temperature sensor 11, so that the set temperature and the temperature detected by the room temperature sensor 11 match. As described above, since the defrost blowing air temperature is decreased by Δb, there is a problem that the defrost capacity is decreased by this amount.

(Means for Solving Problems) The present invention has been proposed to address the above problems, and its gist is to include the outside air temperature detected by an outside air temperature sensor and the ceiling in the passenger compartment. The air conditioning load is calculated based on the vehicle interior temperature detected by the room temperature sensor installed nearby, the set temperature set by the room temperature setting device, etc., and the vehicle interior temperature becomes the set temperature corresponding to this air conditioning load. For vehicles where the blowout air temperature is automatically controlled by adjusting the opening of the air mix damper so that the face blowout mode, hood blowout mode, bilevel blowout mode and defrost blowout mode are selected by the blowout mode switching damper. In the air conditioner, the defrost blowout mode is selected by the blowout mode switching damper and detected by the outside air temperature sensor. A vehicle air conditioner is provided with means for correcting the calculated value of the air conditioning load in an increasing direction when the emitted outside air temperature is below a predetermined temperature.

(Operation) In the present invention, the defrost blowing mode is selected,
Further, when the outside air temperature is equal to or lower than the predetermined temperature, the calculated value of the air conditioning load is corrected in the increasing direction, and the blown air temperature rises correspondingly.

(Embodiment) One embodiment of the present invention is shown in FIGS.

As shown in FIG. 1, the room temperature sensor 11, the outside air temperature sensor 12,
The output of the solar radiation sensor 13, the room temperature setting device 19, the air temperature sensor 14 blowing from the evaporator 5, and the potentiometer 18 for detecting the opening degree of the air mix damper 8 is passed through the input device 40 of the controller 10 and the air conditioning load calculator 41. The air conditioning load is calculated here. The output of the potentiometer 15 which detects the opening degree of the outside air temperature sensor 12 and the blowing mode switching damper 9 is input to the correction amount calculator 42 via the input device 40, and when the blowing mode switching damper 9 is in the defrost blowing mode. A necessary correction amount is calculated according to the outside air temperature, and this correction amount is added to the air conditioning load calculated by the air conditioning load calculator 41.
The air-conditioning load thus obtained enters the output device 43 and is converted into a required drive amount, and then the motor 17 for the air mix damper 8, the motor 16 for the blowout mode switching damper 9, the blower 26
Is output to the motor 22, the intake air switching damper 24 motor 25, and the compressor 1 electromagnetic clutch 20.

Then, as shown in FIG. 3, the operating rate of the compressor linearly decreases in proportion to the decrease of the outside air temperature when the outside air temperature decreases, but when the outside air temperature becomes a certain temperature, for example, 0 ° C. or less,
As the frost protection device operates, it will not operate. Then, when the outside air temperature decreases to a certain temperature, for example, 8 ° C. or less, the correction amount increases as the outside air temperature decreases, and at a certain temperature, for example, 3 ° C. or less, the correction amount corresponding to the increase amount Δa of the room temperature detected by the room temperature sensor 11 is made. The amount A is calculated by the correction amount calculator 42.

Thus, as shown in FIG. 2, when the program is started, it is confirmed in step whether or not the defrost blowing mode is set, and if not, the air conditioning load calculator 41 is set in step.
The air conditioning load is calculated by the output device 43.
However, in the case of YES, the correction amount is calculated by the correction amount calculator 42 in step, and this correction amount is added to the air conditioning load calculated by the air conditioning load calculator 41 and output via the output device 43. Is output.

As a result, since the operating rate of the compressor 1 is high when the outside air temperature is high, it is possible to reliably remove or prevent the fogging of the windshield when the defrost blowing mode is selected, and
In this case, the blown air does not become warm air, so it is not necessary to correct the air conditioning load. When the outside air temperature is low, the operation rate of the compressor 1 decreases and the blown air becomes warm air. However, when the defrost blowout mode is selected, the correction amount commensurate with the temperature rise detected by the room temperature sensor 11 in the air conditioning load. The vehicle interior temperature is controlled by the air-conditioning load obtained by adding.

(Effect of the Invention) In the present invention, the defrost blowing mode is selected,
Further, when the outside air temperature is equal to or lower than the predetermined temperature, the calculated value of the air conditioning load is corrected in the increasing direction, and the blown air temperature rises correspondingly.

As a result, it is possible to prevent a decrease in the defrost blown-out air temperature without impairing the heating capacity even when the outside air temperature is low. Therefore, the defrost function can be sufficiently exerted regardless of the knowledge of the occupant and without any operation.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a control block diagram, FIG. 2 is a flow chart, and FIG. 3 is a compressor operating rate and a correction amount corresponding to changes in outside air temperature. It is a diagram showing the change of. FIG. 4 is a system configuration diagram of a conventional vehicle air conditioner, and FIG. 5 is a diagram showing changes in room temperature and defrost blowing air temperature when the defrost blowing mode is selected. Room temperature setter …… 19, sensor …… 11,12,13,14, blowing air temperature control mechanism …… 8, blowing mode selection mechanism …… 9, defrost outlet …… 33, compressor …… 1, Mechanism for recognizing blowing direction …… 15, controller …… 10, air conditioning load calculator …… 41, correction amount calculator …… 42

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Iimura Nishi-Bashijima-cho, Nishi-Kasugai-gun, Aichi Prefecture 3-chome, Asahi-cho 3-Chome, Air-Conditioning Works, Mitsubishi Heavy Industries, Ltd. Asahimachi 3-chome 1 Air-conditioner manufacturing plant, Mitsubishi Heavy Industries, Ltd. (72) Inventor Takashi Kaneda Shiba 5-33-8, Mitsubishi Motors Co., Ltd. (72) Inventor Yamataka Nobutaka Shiba, Minato-ku, Tokyo 5-33-8, Mitsubishi Motors Corporation (56) Reference JP 61-92908 (JP, A) Actual development 56-138709 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An outside air temperature detected by an outside air temperature sensor,
The air conditioning load is calculated based on the vehicle interior temperature detected by the room temperature sensor installed near the ceiling in the vehicle interior, the set temperature set by the room temperature setting device, etc. The blowout air temperature is automatically controlled by adjusting the opening of the air mix damper to the above set temperature, and the blowout mode switching damper selects the face blowout mode, foot blowout mode, bilevel blowout mode, and defrost blowout mode. In the vehicle air conditioner, when the defrost blowout mode is selected by the blowout mode switching damper and the outside air temperature detected by the outside air temperature sensor is below a predetermined temperature, the calculated value of the air conditioning load is corrected in the increasing direction. An air conditioner for a vehicle, characterized by comprising: