Hitachi, Ltd.

Reijiro Takahashi

Tosikazu Ito

Yoshinori Fukasaku

Tsuneo Kagohata

Akira Tezuka

Toshikazu Ito

Kunihiro Noto

Masanori Musoh

Toshiki Iijima

Tosikatu Ito

A control apparatus of an air conditioner for automobiles comprises: means for calculating a room temperature difference signal; means for calculating a reference blowout temperature; means for correcting the reference blowout temperature, thereby calculating a target blowout temperature; and means for controlling the heat exchanger such that the difference between the target blowout temperature and the actual blowout temperature becomes zero. This control apparatus can always maintain and manage the blowout air temperature at which the passenger can feel most comfortable for various ambient temperature conditions.

Control apparatus of air conditioner for automobiles

Cooling air is introduced through an opening in a wall portion of the motor housing radially opposing the commutator. A deflecting surface is provided for deflecting the cooling air entering the motor through the opening away from the commutator and toward the armature so as to prevent direct contact of dust and moisture in the cooling air with the commutator.

Cooling apparatus for motor means to protect commutator from dust and

An automobile air conditioner of a reheat air mix type, having an evaporator disposed in a duct and a heater core disposed in the duct at the downstream side of the evaporator. Chilled air passages are formed between both sides of the heater core and the surfaces of opposing walls of the duct. The chilled air passages are extended to form a first duct leading to an upper air outlet to the room of automobile and a second duct leading to a lower air outlet opening to the room. A part of the warmed air coming from the heater core is delivered to the first duct while the other part is delivered to the second duct. The air conditioner further has a first air mix damper for controlling the ratio between the flow rate of chilled air flowing into the heater core and the flow rate of the chilled air flowing into the first duct, and a second air mix damper for controlling the ratio between the flow rate of chilled air introduced into the second duct and the flow rate of warmed air flowing from the heater core into the second duct.

Automobile air conditioner

An evaporator including a side plate formed with a number of openings each having rigidly secured therein the upper end portion of one of a number of U-shaped refrigerant tubes, a cover plate attached to the upper surface of the side plate and formed, by recessing its inner surface, with a plurality of bend sections each intercommunicating the upper end portions of the two tubes of the adjacent U-shaped refrigerant tubes forming a set, a distributor section for supplying a suitable refrigerant to refrigerant passages provided by the U-shaped tubes and the bend sections, a manifold section for collecting the refrigerant from the refrigerant passages and discharging same therefrom, and an expansion valve section extending between the distributor section and the manifold section in a manner to intercommunicate the two sections, and an expansion valve assembly mounted in the expansion valve section. In this evaporator, the refrigerant supplied through a high pressure refrigerant pipe connected to the cover plate passes through a valve section of the expansion valve assembly into the distributor section, from which the refrigerant flows through the tortuous refrigerant passages provided by the U-shaped tubes and the bend sections. The refrigerant changes into a gaseous state while flowing through the refrigerant passages, and the gaseous refrigerant is collected in the manifold section, from which it passes through a control section of the expansion valve assembly into a low pressure refrigerant pipe.

Evaporator

An evaporator comprising a tube plate having a number of through holes to which the upper ends of a plurality of U-tubes are fixed, a first cover plate secured to the tube plate and having a plurality of through holes aligned to some through holes of the tube plate, a second cover plate secured to the first cover plate and defining in cooperation therewith passages for introducing and distributing refrigerant, and an expansion valve assembly installed through the first and second cover plates and having a constriction formed therein. The first cover plate defines connecting passages and a collecting passage for the refrigerant in cooperation with the tube plate. The constriction in the expansion valve assembly is communicated with the refrigerant-introducing passage, and the control section of the expansion valve assembly is communicated with the refrigerant-collecting passage, so that the refrigerant flows through a high-pressure piping into the refrigerant-introducing passage and the vaporized refrigerant passes through the refrigerant-collecting passage and leaves the evaporator into a low-pressure piping.

A temperature control apparatus of an air conditioner for automobiles, which comprises a blower for feeding air through a cooling unit and a heating unit disposed in an air passage, an air mix door for controlling the amount of air passing through the heating unit, an actuator for actuating said door, a negative pressure source for applying a negative pressure to said actuator through a controller, a sensor emitting a negative pressure signal in response to the temperature in a cab of an automobile and a regulator emitting a negative pressure signal in response to the change of the position of said door, wherein the output negative pressure signal of the temperature sensor is compared with the output negative pressure signal of the regulator by said controller and a negative pressure is applied to the actuator according to a deviation between said two output signals to control the degree of opening of said air mix door so as to maintain the temperature in the cab at a substantially constant level.

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Katsuta, Japan

Reijiro Takahashi