Nippondenso Co., Ltd.

Yuuji Honda

Hikaru Sugi

Koichi Ban

Yuuichi Kajino

Takayoshi Kawai

Katsuhiko Samukawa

Akio Matsuoka

Yuji Ito

Yuichi Kajino

Masashi Takagi

Masasi Takagi

An air-conditioning device capable of obtaining a suitable blow-out temperature through one passage from the initial period of change even when the air-conditioning operation in which either a first passage or a second passage is closed is changed into an operation condition in which it is opened. A feet mode in which the hot air is blown to the feet of a passenger from a second passage 7, is changed to a bilevel mode in which a first passage 6 that communicates with the upper half body of the passenger is switched from the closed state to the open state. During a predetermined period of time in the initial period following the change, the temperature blown from the first passage 6 is determined based upon a blow-out temperature of the second passage 7 and a desired blow-out temperature TAOV of the first passage 6. At the time of changing the mode, therefore, even when a first temperature sensor 25 is detecting a temperature near a desired blow-out temperature of the first passage 6 before the mode is changed, the air of the present temperature is not blown from the first passage 6 but, instead, a by-pass opening/closing damper 15 is opened, so that the air of a low temperature is blown from the first passage 6.

Air-conditioning device

The object of the present invention is to supply air to passengers in an automobile so that they will feel more comfortable in the presence of solar radiation by suppressing a rise in temperature in a vehicle passenger compartment caused by solar radiation. There is provided a cold air damper which feeds cold air immediately after an evaporator to a face blow port and mixes it with the conditioned air that has passed through an air mixing damper, with the amount of blown air is changed by a blower fan. A control means detects the amount of solar radiation present by using a solar radiation sensor. This invention calculates the temperature of air blown out in the absence of solar radiation, calculates the temperature of air blown out in the presence of solar radiation, calculates a corrected blowing rate according to a thermal equilibrium equation in the presence of solar radiation, and calculates a blowing rate in the presence of solar radiation.

Air conditioning device for vehicles

An air-conditioning apparatus for a vehicle having separate units for a driver's seat and an assistant driver's seat. Each of the units has first and second vent outlets opened to a cabin near the lateral side of the cabin and the center side of cabin. A sensor is provided for detecting an amount of the solar radiation. The sensor also can detect an azimuth angle and elevation angle of the sun with respect to the direction of movement. An increase in the thermal load due to the solar radiation is determined, and the calculated increase is allocated to the first and second vent outlets by changing the temperature and/or the amount of the air discharged from the respective outlets, so that the passenger can feel a uniform temperature irrespective of the position of the sun with respect to the direction of movement of the vehicle.

Vehicle air conditioner having driver and passenger units which operate

A control apparatus for an air conditioner used for a vehicle can properly control the temperature of air in the vehicle according to the quantity of solar radiation so as to maintain the temperature as not too cool for a person in the vehicle while suppressing the temperature as not too hot for the person. The control apparatus comprises a solar radiation sensor for detecting the quantity of solar radiation coming into the vehicle room; an operation unit for entering a set temperature; a target temperature determining unit for receiving an processing a solar radiation quantity signal from the solar radiation sensor and a set temperature signal from the operation unit, and successively finding target temperatures from a first temperature region which is relatively low and in which a temperature decreases slightly relative to an increase in the quantity of solar radiation and a second temperature region which is relatively high and in which a temperature decreases according to an increase in the quantity of solar radiation, and selecting and determining one of the target temperatures according to a predetermined program; and an adjusting unit for adjusting the temperature of air to be blown into the vehicle room according to the target temperature.

Control apparatus for air conditioner used for vehicles

A condenser is connected to an outlet of a compressor. An expansion valve is connected to the condenser. An evaporator is connected between the expansion valve and an inlet of the compressor. A sensor detects a condition of refrigerant at an outlet side of the evaporator. A variation in rate of refrigerant flow into the evaporator is detected. A control device determines a variation in the detected condition of refrigerant which occurs in response to the variation in the rate of refrigerant flow. The control device judges a quantity of refrigerant to be insufficient when the determined variation in the refrigerant condition is equal to or smaller than a reference value.

Refrigeration system

The degree of opening of the expansion valve in refrigeration system is controlled by means of PID control such that a refrigerant superheat at the outlet of the evaporator approaches a target valve. Since an elapsed time after the start of the refrigeration system varies in response to a change of a heat load of air to be cooled by the evaporator, if the control constant of the PID control is designed so that the expansion valve can be controlled adequately for high evaporator heat load, or for low evaporator heat load, adequate control cannot be achieved in the opposite case not taken into consideration in design. According to the present invention, the control constant of the PID control is varied when an elapsed time after the start of the refrigeration system reaches a reference time which is determined on the basis of a heat load of air to be cooled by the evaporator.

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Kariya, Japan

Yuuji Honda