|Publication number||US7841768 B2|
|Application number||US 12/247,038|
|Publication date||Nov 30, 2010|
|Filing date||Oct 7, 2008|
|Priority date||Apr 7, 2006|
|Also published as||DE102007009672A1, DE102007009672B4, EP2007601A1, EP2007601B1, US20090097529, WO2007115652A1|
|Publication number||12247038, 247038, US 7841768 B2, US 7841768B2, US-B2-7841768, US7841768 B2, US7841768B2|
|Inventors||Johann Regensburger, Georg Bauer, Andreas Kramlich, Michael Reiser, Wolfgang Kuechler|
|Original Assignee||Preh Gmbh|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (18), Referenced by (1), Classifications (12), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This nonprovisional application is a continuation of International Application No. PCT/EP2007/002431, which was filed on Mar. 20, 2007, and which claims priority to German Patent Application Nos. 10 2006 016 821.6, which was filed in Germany on Apr. 7, 2006, and to 10 2007 009 672.2, which was filed in Germany on Feb. 28, 2007 and which are herein incorporated by reference.
1. Field of the Invention
The invention relates to a sensor arrangement for determining an interior temperature in a motor vehicle, which sensor arrangement is at least one part of a climate control panel, having a closed housing with at least one front wall and a rear wall, whereby the front wall is made of a material assuring good heat transport and the housing is filled with a heat-insulator, a first temperature sensor attached to a back of the front wall, and a second temperature sensor, which works together with the first temperature sensor at least in regard to evaluating the interior temperature.
2. Description of the Background Art
Controlled climate units are employed so that a predefinable temperature in an interior of a motor vehicle can be set and a temperature can be maintained. Highly diverse sensors are used hereby to detect the actual value of the interior temperature. In many cases, the sensors are integrated into the climate control panel of the motor vehicle to form a self-contained unit. For this purpose, different effects on a sensor arrangement for detecting the actual temperature must be considered to detect the actual value. Thus, in particular, direct solar radiation on the sensor arrangement can falsify the measured values, which in turn results in insufficient control of the interior temperature. Apart from solar radiation, air circulation, temperature of peripheral devices, as well as the body temperature of the operator, must be considered and eliminated from the measured value to detect the interior temperature.
A sensor arrangement to detect the actual interior temperature is disclosed in European Patent Application No. EP 1 415 829 B1, which is herein incorporated by reference, and which describes a sensor arrangement for determining the interior temperature, the sensor arrangement being mounted on an exterior side of a climate control panel of a climate control unit. The sensor arrangement has a temperature sensor, which is attached to a rear side of a front wall of the sensor arrangement with good thermal contact to the front wall. The sensor housing is closed on the back by a tub-shaped plastic housing relative to the interior of the control panel.
On the one hand, a thermal coupling occurs due to the arrangement of a temperature sensor on the inner side of the front wall, and on the other, there is an extremely precise determination of a temperature before the front wall due to the good thermal conductivity of the front wall. This in turn corresponds to a temperature of the interior of the motor vehicle.
It is therefore an object of the invention to provide a sensor arrangement, which enables miniaturization of the sensor and at the same time provides for a more precise and more rapid detection of the measured values without use of a sensor ventilator unit, i.e., active sensor ventilation. In addition, interfering effects by heat sources affecting the sensor are eliminated.
In an embodiment, at least a second temperature sensor in the sensor arrangement is attached to an inner side of the rear wall, the side facing the back of the front wall. By attaching an at least second temperature sensor in the interior of the housing of the sensor arrangement, heat sources, radiating backward onto the sensor arrangement, are detected in terms of temperature, evaluated in downstream evaluation electronics, and used for a more accurate detection of the interior temperature. In contrast to the conventional art, the direct heating of the housing of the sensor arrangement is detected hereby, from which the actual heat radiation on the first temperature sensor can be detected. By integration into the housing and detection of the backward radiation of the rear wall of the housing, on the one hand, rapid adjustment of the first temperature sensor is possible and the sensor arrangement can be dimensioned a great deal smaller in its dimensions.
In the sensor arrangement of the invention, peripheral devices, which also include for this purpose a printed circuit board belonging to the climate control panel and arranged behind the sensor, can be covered by the second temperature sensor. In the case of interference, such as, for example, sunshine, a finger on the sensor arrangement, the measured values can be checked for plausibility by comparison with an energy balance and a suitable logic and if appropriate, alternatively the theoretically calculated temperature can be used as the basis for the actual temperature value for climate control. In this case, the energy balance model calculates the interior temperature from all necessary sensor and operating values, available in the control unit and in the on-board electrical system of the motor vehicle. Such operating values are, for example, the outside temperature, the exhaust temperature from the vents, the air distribution, the amount of air, a sun sensor, et cetera.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitive of the present invention, and wherein:
Temperature sensor 4, which can be an NTC resistor, is attached directly to the back of front wall 2. Another NTC resistor as temperature sensor 5 is attached to a surface, facing the back of front wall 2, of the rear wall 3 of the housing of surface sensor 1. An insulating material 7 is installed into the housing between temperature sensors 4 and 5. Insulating material 7 prevents heat radiation from reaching first temperature sensor 4 from the back of the housing and thereby improves the functionality of sensor arrangement 1.
The temperature radiation originates from peripheral devices in the motor vehicle and is radiated primarily from a printed circuit board 11 disposed behind surface sensor 1, whereby heat radiation W reaches surface sensor 1 in the direction of arrow W. Such printed circuit boards 11 are typically warm to 40° C. and therefore heat the housing rear section 3 of sensor arrangement 1. This can interfere with the measured value of the first temperature sensor 4. The detrimental effect is prevented, on the one hand, by the use of an insulating material 7 in the interior of the surface sensor and, on the other, detected electronically by detection of the temperature of second temperature sensor 5 and taken into account in the evaluation. Possible insulating materials 7 in this case are PU foam, silicone foam, hollow glass spheres, or hollow ceramic spheres.
Another advantage according to the invention results when another temperature sensor 12 is attached in the immediate vicinity of sensor arrangement 1. It is therefore possible to detect directly the temperature of printed circuit board 11 or another peripheral device in the vicinity of sensor arrangement 1 and to take it into account in the evaluation and determination of the interior temperature before aperture 8. It is noted in this respect that it is also conceivable naturally according to the invention to attach the second or another additional temperature sensor in housing 2, 3 to an inner side of housing rear section 3, in such a way that other heat sources surrounding sensor 1 can be detected.
Front wall 2 can be made of a material with good thermal conductivity. An example of this is, for example, metal and particularly aluminum and copper. First temperature sensor 4 is attached to the back of front wall 2, as also described in the prior art, to which reference is expressly made here. To exclude all interfering effects on the front wall 2 or at least to minimize them, front wall 2 is kept on support domes 13 at a distance to rear wall 3. This is clearly evident in
An exemplary embodiment of the invention, in which sensor arrangement 1 is made as a cylinder, is shown in
In addition, it is also possible according to the invention to arrange several temperature sensors 5, 11, in one regard, in the housing of sensor arrangement 1, and also to attach them in the periphery of sensor 1. To adapt to the climate control unit or to the interior of the motor vehicle, it is conceivable according to the invention to provide a finish for the front wall at least on the side facing the vehicle operator or thereby to adapt it optically.
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are to be included within the scope of the following claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4655607 *||Oct 30, 1985||Apr 7, 1987||Santa Barbara Research Center||High speed hot air leak sensor|
|US4659236 *||Oct 21, 1985||Apr 21, 1987||Tempmaster Corporation||Flush mounted temperature sensor|
|US4702619 *||Dec 12, 1985||Oct 27, 1987||Standard Telephones And Cables Public Limited Company||Temperature sensors|
|US5008775 *||Sep 11, 1989||Apr 16, 1991||Honeywell Regelsysteme Gmbh||Sensor and control module with improved sensor isolation|
|US5022766 *||Jan 19, 1990||Jun 11, 1991||Phipps Jack M||Temperature sensing device|
|US5178464 *||Apr 19, 1991||Jan 12, 1993||Thermoscan Inc.||Balance infrared thermometer and method for measuring temperature|
|US5324049 *||Dec 23, 1992||Jun 28, 1994||Xerox Corporation||Mandrel with flared, dish shaped disk and process for using mandrel|
|US5558436 *||Jul 14, 1994||Sep 24, 1996||Landis & Gyr, Inc.||Thermally isolated room temperature sensing apparatus|
|US7497251 *||Nov 15, 2004||Mar 3, 2009||Denso Corporation||Vehicle air conditioner|
|US20020110178 *||Apr 19, 2002||Aug 15, 2002||Delphi Technologies, Inc.||Infrared temperature sensor|
|US20050156753 *||Feb 7, 2005||Jul 21, 2005||Donnelly Corporation||Digital sound processing system for a vehicle|
|US20060074586 *||Sep 30, 2005||Apr 6, 2006||Johnson Controls Technology Company||Temperature sensing device|
|US20060153278 *||Jan 11, 2005||Jul 13, 2006||Kun-Sung Chen||Ear thermometer|
|US20090005136 *||Sep 5, 2008||Jan 1, 2009||Donnelly Corporation||Interior rearview mirror system with identifier module|
|DE4130063A1 *||Sep 10, 1991||Mar 11, 1993||Hella Kg Hueck & Co||Vehicle passenger compartment temperature measuring appts. - has one temperature sensor mounted on surface of insulating body and another mounted on grid closing device off from passenger compartment|
|DE19728803C1||Jul 5, 1997||Aug 26, 1999||Eberle Controls Gmbh||Arrangement for measuring and regulating temperature e.g. for adjusting a heating system|
|EP1415829A1||Sep 10, 2003||May 6, 2004||Preh-Werke GmbH & Co. KG||Arrangement of a temperature sensor for determining interior temperature|
|EP1440828A2||Dec 5, 2003||Jul 28, 2004||Preh GmbH||Method for determining the temperature of a motor vehicle passenger compartment, device for carrying out the method and temperature sensor|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US20150025738 *||Jul 22, 2013||Jan 22, 2015||GM Global Technology Operations LLC||Methods and apparatus for automatic climate control in a vehicle based on clothing insulative factor|
|U.S. Classification||374/141, 374/29, 374/109, 374/137|
|International Classification||G01K1/14, G01K13/00, G01K17/06|
|Cooperative Classification||B60H1/00792, G01K2201/02, G01K1/20|
|European Classification||G01K1/20, B60H1/00Y5P|
|Dec 29, 2008||AS||Assignment|
Owner name: PREH GMBH, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:REGENSBURGER, JOHANN;BAUER, GEORG;KRAMLICH, ANDREAS;AND OTHERS;REEL/FRAME:022032/0939;SIGNING DATES FROM 20081020 TO 20081025
Owner name: PREH GMBH, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:REGENSBURGER, JOHANN;BAUER, GEORG;KRAMLICH, ANDREAS;AND OTHERS;SIGNING DATES FROM 20081020 TO 20081025;REEL/FRAME:022032/0939
|May 26, 2014||FPAY||Fee payment|
Year of fee payment: 4