Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
  • B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
  • B60H1/00785—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models by the detection of humidity or frost
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N25/00—Investigating or analyzing materials by the use of thermal means
  • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
  • G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point

Definitions

• the invention relates to a sensor arrangement for detecting the tendency of fogging on an inner surface, in particular on the side facing the vehicle interior of a windshield, with a contactless temperature sensor for measuring the temperature of
• Inner surface in particular of the vehicle interior facing side of the windshield, and with a humidity sensor for measuring the humidity.
• Such a sensor arrangement is known for example from DE 103 25 971 A1.
• Such sensor arrangements provide measured values or values calculated therefrom for the relative humidity and for the temperature or for the current dew point. Measures can be derived from the measurement results obtained by, for example, controlling or regulating the heating, ventilating and / or air conditioning system in such a way as to counteract the current condition of the fitting or the current fogging tendency.
• Such a device is described for example in DE 199 42 286 C1.
• the invention has for its object to provide a sensor arrangement of the type mentioned, which is designed to be particularly compact.
• the solution of this object is achieved with a sensor arrangement having the features of claim 1.
• the temperature sensor and the Moisture sensor are formed as semiconductor elements and that the temperature sensor and the humidity sensor are arranged stacked. In this way, a particularly compact design can be achieved, which takes up very little space. In addition, this type of training of the sensor array is relatively inexpensive to implement.
• the temperature sensor is preferably arranged above the humidity sensor.
• a cover is advantageously arranged, which is preferably produced in microsystem technology. That way is the
• the cover, the temperature sensor and the humidity sensor are preferably formed as a layer stack. This is very compact.
• the temperature sensor is preferably designed as a thermopile.
• the thermopile is also called thermopile in German.
• the temperature sensor is preferably arranged or housed in an airtight housing.
• the housing is essentially formed by the moisture sensor and the cover.
• the housing is evacuated.
• the housing is filled with an inert gas. The gas filling allows specific settings of the formed as a thermopile temperature sensor.
• the temperature sensor and the humidity sensor are connected to each other with their backs.
• optical elements are integrated in the cover. These optical elements can be shadowing, grids, lenses or other elements, for example, with which the directivity of the non-contact temperature sensor can be influenced in a targeted manner.
• the sensor arrangement preferably has a housing.
• at least one opening is preferably provided.
• at least one opening is provided on each side of the housing.
• an opening is provided above the sensors, in particular above the layer stack, so that ambient air and also radiation can reach the sensors.
• a printed circuit board is provided in the housing, on which the layer stack is arranged. The circuit board is conveniently essentially one
• FIGURE of the drawing shows a cross section through a schematically illustrated inventive sensor arrangement.
• the entire sensor arrangement is marked with 1.
• This essentially has the arranged in the housing 20 layer stack 10, wherein the layer stack of a humidity sensor 12, a
• Temperature sensor 11 and a cover 13 composed. Both the humidity sensor 12 and the temperature sensor 11 and the cover 13 are manufactured in microsystem technology.
• the humidity sensor 11, which is preferably designed as a thermopile, and the humidity sensor 12 have an ASIC for signal processing.
• the underlying moisture sensor 12 is fixed with solder 14 on an underlying circuit board 1.
• solder 14 the temperature sensor 11 is mounted on the humidity sensor 12 and the cover 13 on the temperature sensor 11.
• the three elements are formed coincident in their dimensions, and stacked on top of each other, so that overall results in the described layer stack.
• circumferential seals 15 are provided so that the formed as a thermopile temperature sensor 11 is hermetically housed or enclosed.
• thermopile reacts only to the influence of externally acting thermal radiation in the far infrared (> 3.5 microns). It is covered from above and below and the resulting cavity can be evacuated or filled with an inert gas.
• the humidity sensor 12 and the temperature sensor 11 are connected to each other with their backsides.
• the electrical contacting takes place via plated-through holes of the semiconductor components which are produced in microsystem technology (MST).
• MST microsystem technology
• the circuit board 21 is slightly larger in dimensioning than the layer stack 10 and is held by a right-angled downwardly bent portion 27. This vertical portion 27 is attached to a contact pin 25. Overall, the printed circuit board is thereby held flexible with respect to the housing 20.
• the contact pin 25 is in the lower region of the housing 20 by a
• EMC Electromagnetic compatibility
• Temperature and humidity are detected. From this information about the fogging tendency can be derived and appropriate countermeasures can then be initiated by the ventilation or air conditioning in particular of a motor vehicle.

Landscapes

• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Radiation Pyrometers (AREA)
• Investigating Or Analyzing Materials Using Thermal Means (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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ID=36889294

Family Applications (1)

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Citations (5)

Family Cites Families (2)

• 2005
  • 2005-05-11 DE DE200510021708 patent/DE102005021708A1/de not_active Withdrawn
• 2006
  • 2006-05-08 EP EP06722846A patent/EP1879761B1/de active Active
  • 2006-05-08 DE DE502006004243T patent/DE502006004243D1/de active Active
  • 2006-05-08 WO PCT/DE2006/000789 patent/WO2006119740A1/de not_active Ceased

Patent Citations (5)

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