Automatic temperature and humidity regulation – Ventilator type – Electrically actuated
Patent
1988-11-14
1990-04-17
Wayner, William E.
Automatic temperature and humidity regulation
Ventilator type
Electrically actuated
165 16, 621766, 98 201, F25B 2900, F24F 700
Patent
active
049172930
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a heating and/or air conditioning apparatus for motor vehicles. Such an apparatus is known from EP-A 130,528, for example. In the known apparatus, the interior temperature of the motor vehicle is regulated to a desired or to a necessary value. In order to measure the temperature, a temperature sensor is provided in the head space and a temperature sensor is provided in the foot space. The output signals of the two sensors are applied to a regulating circuit as a function of the exterior temperature. However, regulation to a specific temperature is not synonymous with the provision of comfortable interior atmosphere, because further influencing parameters in addition to the temperature must be taken into consideration when assessing the atmosphere.
SUMMARY OF THE INVENTION
In the heating and/or air conditioning apparatus for motor vehicles according to the invention, in addition to the temperature detection, at least one humidity sensor is also provided to detect the relative air humidity. The humidity sensor permits to regulate the interior atmosphere to a comfortable manner in a simple manner.
An arrangement of a temperature sensor and a humidity sensor in the proximity of a window permits the detection of an impending drop below the dew point, which results in condensation on the windows. Appropriate countermeasures can thereupon be initiated.
A further improvement in the detection of an imminent drop below the dew point is achieved by the use of an exterior temperature sensor and/or a radiation sensor.
The admission and injection of a humid cold air stream into the interior passenger space is avoided if the humidity sensor is arranged in the intake duct of the air conditioning installation or externally to measure the relative ambient air humidity.
Further particulars and advantageous of the apparatus according to the invention will appear from the description that follows with reference to the appended drawing.
BRIEF DESCRIPTION OF THE DRAWING
The single FIGURE shows a heating and/or air conditioning apparatus installed in a motor vehicle with a regulating unit associated with the air-conditioning apparatus.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The FIGURE shows a heating and/or air conditioning apparatus 12, with which a regulating unit 14 is associated, arranged in a motor vehicle 10. The admission of air occurs through a first intake duct 16, which opens outside of the vehicle, as well as through a second intake duct 18, which opens into the interior 20 of the motor vehicle 10. At least two interior ventilation ducts are provided, of which a first ventilation duct 22 opens in the vicinity 24 of a window 11, and a second ventilation duct 26 opens into vehicle interior 20. Air current in the ducts 16, 18, 22, 26 is created by dynamic pressure during displacement or by a blower 28 of the apparatus. If necessary, heating means or cooling means 30 performs heating or cooling of the air delivered into the interior 20. The apparatus 12 is controlled by the regulating unit 14. The regulating unit 14 determines whether the blower 28 and/or the heating unit/cooling means 30 is switched on, whether the exterior air is to be admitted through the first intake duct 16 or interior air through the second intake duct 18, and whether the ventilation is to occur through the first ventilation duct 22 and/or the second ventilation duct 26. The signal of a plurality of sensors are fed to the regulating unit 14 for the purpose of performing the regulation function.
A first temperature sensor 32 and a first humidity sensor 34 are arranged in the interior 20. Regulation of the interior atmosphere to a comfortable level is already possible with these two sensors 32, 34. First, of all a desired temperature is input through an input device 36. In principle, the presetting of a desired relative air humidity could also be provided. However, operating errors cannot be excluded in this mode of operation without precise knowledge of the relationship between temperatur
REFERENCES:
patent: 4362026 (1982-12-01), Miller
patent: 4424933 (1984-01-01), Sutoh et al.
patent: 4760772 (1988-08-01), Horiguchi et al.
Fedter Horst
Grunwald Werner
Nolting Peter
Robert & Bosch GmbH
Striker Michael J.
Wayner William E.
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