Automatic temperature and humidity regulation – Humidity control
Patent
1988-12-16
1990-06-12
Wayner, William
Automatic temperature and humidity regulation
Humidity control
62 93, 165 16, 236 493, B01F 302
Patent
active
049325884
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method of controlling a heating and/or air conditioning in motor vehicles. Known methods adjust the interior temperature of the motor vehicle to a desired or required value. In order to measure the temperature, a temperature sensor is arranged in the interior space, its output signal being fed to the control device of the heating and/or air conditioning system. However, adjusting to a determined temperature is not synonymous with providing a comfortable interior climate, since other influencing variables aside from temperature are decisive for evaluating the climate.
SUMMARY OF THE INVENTION
The object of the invention is a method for controlling heating and/or air conditioning in motor vehicles in which, in addition to temperature, relative humidity is also taken into account. For this purpose, at least one humidity sensor is arranged in the interior space of a motor vehicle.
If the relative humidity in the interior space increases, it is possible to lower the temperature in order to continue to maintain a comfortable climate. If the temperature is not to be changed, a dehumidification of the interior air is carried out. Air-circulation operation, in which the interior air is sucked into an intake duct opening into the interior space, dehumidified and released again into the interior space, is particularly suitable for this purpose.
It is particularly advantageous that imminent or existing condensation on the inside surface of the windshield be detected and that corresponding countermeasures be taken. As a function of the signals from a temperature sensor, which is arranged in the vicinity of the windshield, and a humidity sensor, the climate in the vicinity of the windshield is influenced in such a way that imminent condensation is prevented and already existing condensation is eliminated, respectively. This can be effected, on one hand, by raising the temperature of the air in the vicinity of the windshield since the ability of air to absorb water increases as the temperature increases and, on the other hand, by supplying air with lower relative humidity.
In addition, it is advantageous that the temperature and relative humidity of the air sucked into the intake duct, which opens outside of the vehicle, be influenced as a function of the signals of a temperature sensor arranged in the intake duct and by a humidity sensor.
These and other details and advantageous developments of the method according to the invention will be best understood, can be seen from the following description with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The single FIGURE shows schematically a heating and/or air conditioning system installed in a motor vehicle.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The drawing shows a heating and/or air conditioning system 12 arranged in a motor vehicle 10, and a control device 14 for controlling the heating and/or air conditioning system 12. The air intake is effected by a first intake duct 16 which opens outside of the vehicle, as well as by means of a second intake duct 18 which opens into the interior 20 of the motor vehicle 10. At least two interior ventilation ducts are provided, a first ventilation duct 22 opening out in the vicinity 24 of a windshield 11, and a second ventilation duct 26 opening into the interior 20. An air current in the ducts 16, 18, 22, 26 is created by back pressure during travel or by a fan 28 of the system 12. If necessary, a heating or cooling arrangement 30 takes over heating or cooling of the air fed into the interior space 20. The system 12 is controlled or regulated, respectively, by the control device 14. The control device 14 determines whether or not the fan 28 and/or heating/cooling arrangement 30 should be switched on, whether or not outside air should be taken in via the first intake duct 16 or interior air should be taken in via the second intake duct 18, and whether or not the ventilation should be effected via the first ventilation duct 22 and/or the seco
REFERENCES:
patent: 4362026 (1982-12-01), Miller
patent: 4408660 (1983-10-01), Sutoh et al.
patent: 4424933 (1984-01-01), Sutoh et al.
patent: 4460122 (1984-07-01), Jardinier et al.
Fedter Horst
Grunwald Werner
Nolting Peter
Robert & Bosch GmbH
Striker Michael J.
Wayner William
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