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Air conditioning apparatus for vehicle

a technology for air conditioning apparatus and vehicles, which is applied to vehicle components, vehicle heating/cooling devices, transportation and packaging, etc., can solve the problems of insufficient dehumidification capacity of inside air prevent frosting of cooling heat exchangers, and prevent parts from frosting

Inactive Publication Date: 2006-10-12
UEMURA YUKIO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to an air conditioning system that prevents frosting of the cooling heat exchanger in winter season. The system includes a temperature sensor that detects the temperature of air blown out from the cooling heat exchanger and the second air passage. The refrigerant flow into the cooling heat exchanger is intermitted based on the temperature detected by the sensor and a set temperature set in advance. The set temperature is changed to be higher according to the decrease in the temperature of outside air, which prevents frosting of the cooling heat exchanger. This results in improved efficiency and prevention of damage to the air conditioning system."

Problems solved by technology

As a result, it turns out that the following problem occurs.
However, if the set temperature of the temperature sensor 39 is set to be higher as described above, in winter season where the outside-air temperature is low, the temperature of the blown-air in the inside-air passage 13 is increased by 10° C. for example as shown in FIG. 1D, there occurs a problem that the dehumidifying capacity for the inside-air is insufficient.

Method used

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  • Air conditioning apparatus for vehicle
  • Air conditioning apparatus for vehicle
  • Air conditioning apparatus for vehicle

Examples

Experimental program
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first embodiment

[0038] the present invention will be described.

[0039] In this embodiment, each of air conditioning components in an air conditioning unit for air conditioning a space in a passenger compartment of a vehicle having a diesel engine mounted thereon is controlled by an air conditioning control apparatus (hereinafter referred to as “ECU”.

[0040] Firstly, a construction of the air conditioning unit will be described with reference to FIG. 1.

[0041] The air conditioning unit 1 is mounted on the vehicle in such a manner that an upward direction of FIG. 1 is set to a front direction of the vehicle (toward the engine), a downward direction of FIG. 1 is set to a rear direction of the vehicle (toward the passenger compartment), and a right-and-left direction of FIG. 1 is set to a width direction of the vehicle. The air conditioning unit 1 is provided with an air conditioning case 2 for forming an air passage for introducing conditioned air into the passenger compartment.

[0042] The air conditio...

second embodiment

[0100] the present invention will be described.

[0101] The second embodiment differs from the first embodiment in that the post-evaporator temperature sensor 39 is disposed at the inside-air side of the evaporator 7 (in the second air passage 14) and the process of step 180a in FIG. 6 is modified. The other features are same as in the first embodiment.

[0102] As described above with reference to FIG. 10, when the post-evaporator temperature sensor 39 is disposed at the outside-air side (the second air passage 14) of the evaporator 7, the temperature of air blown out from a part at the inside-air of the evaporator 7 increases so that the dehumidifying capacity may be deteriorated. In the second embodiment, as shown at step 180a′ of FIG. 7, in winter season where the outside-air temperature Tam is low, the set temperatures T1 and T2 are set in a low area A (e.g., T1=2° C., T2=3° C.). In an intermediate period of spring or fall, the set temperatures T1 and T2 are set in an intermediate ...

fourth embodiment

[0137] the present invention will be described.

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Abstract

An interior of an air conditioning case is partitioned into a first air passage extending from an inside air suction port to a foot opening portion and a second air passage extending from an outside air suction port is disposed at a side of the first air passage to detect a temperature of air blown out from the evaporator disposed in the first air passage and the second air passage. An operation of the compressor for supplying the refrigerant to the evaporator is intermitted by comparing the temperature detected by the temperature sensor and the set temperature set in advance, and the set temperature is changed to be higher according to an increase in the temperature of outside air. In this way, it is possible to prevent the frosting of the evaporator in winter season, when the inside air is introduced into the first air passage and the outside air is introduced into the second air passage.

Description

CROSS REFERENCE TO THE RELATED APPLICATIONS [0001] This application is a divisional of U.S. application Ser. No. 08 / 950,826 filed on Oct. 15, 1997 which is a continuation-in-part of U.S. application Ser. No. 08 / 872,647 filed on Jun. 10, 1997 and claims priority of Japanese Patent Application No. Hei. 8-273715 filed on Oct. 16, 1996, the content of which are incorporated herein by reference. The application is also related to Japanese Patent Application Nos. Hei. 8-152721 filed on Jun. 13, 1996, Hei. 8-340107 filed on Dec. 19, 1996, and Hei. 8-340182 filed on Dec. 19, 1996, also incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to an air conditioning apparatus having a first air passage and a second air passage, formed in an air conditioning case, in which inside air and outside air are introduced into the first air passage and the second air passage, respectively. [0004] 2. Description of Related Art [0005] In...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60H1/00
CPCB60H1/00849B60H1/321B60H2001/3283B60H2001/327B60H2001/3261
Inventor UEMURA, YUKIOSUWA, KENJISHIKATA, KAZUSHI
Owner UEMURA YUKIO
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