Heat exchange – With timer – programmer – time delay – or condition responsive... – Having heating and cooling capability
Reexamination Certificate
1999-07-20
2001-05-15
Lazarus, Ira S. (Department: 3743)
Heat exchange
With timer, programmer, time delay, or condition responsive...
Having heating and cooling capability
C165S042000, C454S156000
Reexamination Certificate
active
06230795
ABSTRACT:
This application is related to and claims priority from Japanese Patent Application No. Hei. 10-239030 filed on Aug. 25, 1998, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an air conditioning apparatus for a vehicle, which can independently control temperature of air blown toward a front seat side and temperature of air blown toward a rear seat side in a passenger compartment.
2. Description of Related Art
In a conventional vehicle air conditioning apparatus, a front air mixing door and a rear air mixing door are independently disposed so that temperature of air blown toward a front seat side and temperature of air blown toward a rear seat side are independently controlled. Further, a rear face door for opening and closing a rear face air outlet is provided in the rear face air outlet. When air blown from the rear face air outlet is not necessary, the rear face air outlet is closed by the rear face door.
However, when the rear face air outlet is closed by the rear face door when the rear air mixing door is rotated at an opening position between a maximum cooling position and a maximum heating position, cool air on a downstream side of a cooling heat exchanger flows into a downstream side of the heating heat exchanger through a rear cool air bypass passage, and temperature of air blown toward the front seat side of the passenger compartment is decreased.
SUMMARY OF THE INVENTION
In view of the foregoing problems, it is an object of the present invention to provide an air conditioning apparatus for a vehicle, which can independently control temperature of air blown toward a front side and temperature of air blown toward a rear side in a passenger compartment, while preventing temperature of air blown into the passenger compartment from being changed even when an air outlet is closed.
According to the present invention, an air conditioning apparatus includes an interrupting unit for interrupting air blown from an air outlet, an interrupting signal generating unit for generating an interrupting signal when air blown from the air outlet is interrupted by the interrupting unit, and a control unit for controlling operation of an air mixing door for adjusting temperature of air blown toward the air outlet. In the air conditioning apparatus, the control unit controls the air mixing door in such a manner that a communication between a bypass passage through which air bypasses a heating heat exchanger and a warm air passage through which air having passed through the heating heat exchanger flows is interrupted by the air mixing door when the interrupting signal is generated from the interrupting signal generating unit. Thus, in the air conditioning apparatus, even when the air outlet is closed, temperature of air blown from the other air outlet is not changed.
Preferably, the air outlet is for blowing air toward a rear upper side of the passenger compartment, and the air ID mixing door is for adjusting temperature of air blown toward the rear upper side of the passenger compartment. Thus, in the air conditioning apparatus where temperature of air blown toward a front side of the passenger compartment and temperature of air blown toward a rear side of the passenger compartment are independently controlled, even when the air outlet is closed by the interrupting unit, the communication between the bypass passage and the warm air passage is interrupted by the air mixing door. Thus, it can prevent cool air in the bypass passage from being introduced into the warm air passage, thereby preventing temperature of air blown toward the front side of the passenger compartment from being decreased.
More preferably, the interrupting unit is a door for opening and closing the air outlet. Therefore, the air conditioning apparatus has a simple structure while accurately independently controlling temperature of air blown toward a front side and temperature of air blown toward a rear side of the passenger compartment.
REFERENCES:
patent: 4665971 (1987-05-01), Sakurai
patent: 4791981 (1988-12-01), Ito
patent: 5014911 (1991-05-01), Vincent
patent: 5016704 (1991-05-01), Ono
patent: 5190096 (1993-03-01), Taniguchi et al.
patent: 5195574 (1993-03-01), Tanaka et al.
patent: 5601142 (1997-02-01), Hildebrand et al.
patent: 3-189225 (1991-08-01), None
patent: 5-278448 (1993-10-01), None
Kanda Hiroshi
Mochizuki Yoshinobu
Naito Nobuyasu
Nakamura Takeshi
Tsunooka Tatsuo
Ciric Ljiljana V.
Denso Corporation
Harness Dickey & Pierce PLC
Lazarus Ira S.
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