System for determining ambient temperature
First Claim
1. A method for determining ambient temperature comprising:
- determining a first set of temperatures from a first sensor at a first location within an enclosure having an apparatus that generates heat;
determining a second set of temperatures from a second sensor at a second location within the enclosure;
generating a two-dimensional relationship with a processor having inputs of the first and second sets of temperatures;
generating an equation with the processor as an approximation of the two-dimensional relationship; and
determining an ambient temperature proximate to and external of the enclosure from the equation with the processor;
wherein;
the two-dimensional relationship of the first and second temperatures is generated with the processor from the first and second sets of temperatures determined approximately simultaneously at several levels of power consumed by the apparatus;
the first set of temperatures at the several levels of power is represented as a first plot;
the second set of temperatures at the several levels of power is represented as a second plot; and
the first and second plots are combined into a third plot representing the first set of temperatures versus the second set of temperatures with a portion of the plots representing the several levels of the power dropping out;
generating the equation as an approximation of the third plot; and
solving for the ambient temperature from the equation;
wherein;
the equation is Ta=(T1−
AT2−
B)/(1−
A);
A is a slope of the third plot;
B is an offset of the third plot;
T1 is a temperature at the first location; and
T2 is a temperature at the second location.
3 Assignments
0 Petitions
Accused Products
Abstract
A mechanism for indicating ambient temperature of an enclosure from temperatures determined within the enclosure. The temperatures may be obtained from two or more sensors at each of two or more locations within the enclosure. The enclosure may include an apparatus inside such as electronics of which power consumption may be determined. Data including temperatures of two locations within the enclosure at various electronics power consumption levels may be entered into a 2-D plot. An approximation of the 2-D plot may be effected with an appropriate equation to be solved for ambient temperature. The data of the dimensional 2-D plot plus temperatures of a third location and air flow levels in the enclosure may be entered into a 3-D plot. An approximation of the 3-D plot may be effected with an appropriate equation to be solved for ambient temperature.
45 Citations
12 Claims
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1. A method for determining ambient temperature comprising:
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determining a first set of temperatures from a first sensor at a first location within an enclosure having an apparatus that generates heat; determining a second set of temperatures from a second sensor at a second location within the enclosure; generating a two-dimensional relationship with a processor having inputs of the first and second sets of temperatures; generating an equation with the processor as an approximation of the two-dimensional relationship; and determining an ambient temperature proximate to and external of the enclosure from the equation with the processor; wherein; the two-dimensional relationship of the first and second temperatures is generated with the processor from the first and second sets of temperatures determined approximately simultaneously at several levels of power consumed by the apparatus; the first set of temperatures at the several levels of power is represented as a first plot; the second set of temperatures at the several levels of power is represented as a second plot; and the first and second plots are combined into a third plot representing the first set of temperatures versus the second set of temperatures with a portion of the plots representing the several levels of the power dropping out; generating the equation as an approximation of the third plot; and solving for the ambient temperature from the equation; wherein;
the equation is Ta=(T1−
AT2−
B)/(1−
A);A is a slope of the third plot; B is an offset of the third plot; T1 is a temperature at the first location; and T2 is a temperature at the second location.
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2. A method for determining ambient temperature, comprising:
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determining a first set of temperatures from a first sensor at a first location within an enclosure having an apparatus that generates heat; determining a second set of temperatures from a second sensor at a second location within the enclosure; generating a two-dimensional relationship with a processor having inputs of the first and second sets of temperatures; generating an equation with the processor as an approximation of the two-dimensional relationship; and determining an ambient temperature proximate to and external of the enclosure from the equation with the processor; determining a third set of temperatures at a third location within the enclosure; generating a three-dimensional relationship of the first, second and third set of temperatures; generating a second equation as an approximation of the three-dimensional relationship; and determining an ambient temperature proximate to the enclosure from the second equation; wherein the first, second and third set of temperatures are determined approximately simultaneously at several levels of power consumed by the apparatus and at several levels of flow within the enclosure, which are represented as a three-dimensional plot having a first axis representing the first set of temperatures, T1, a second axis representing the second set of temperatures, T2, and a third axis representing the third set of temperatures, T3; and generating the second equation as an approximation of the three-dimensional plot; wherein;
the second equation is Ta=(AT1+BT2+CT3+D)/(A+B+C);Ta is the ambient temperature; and A, B, C and D are constants.
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3. A system for determining ambient temperature, comprising:
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a first temperature sensor situated at a first location within an enclosure; a second temperature sensor situated at a second location within the enclosure; a processor connected to the first temperature sensor and the second temperature sensor; wherein the processor is for determining an indication of ambient temperature of a volume proximate to and external of the enclosure based on a two-dimensional relationship representing outputs from the first temperature sensor and the second temperature sensor; wherein the processor is for generating an equation approximating the two-dimensional relationship and for determining the ambient temperature from the equation; and wherein;
the equation is Ta=(T1−
AT2−
B)/(1−
A);Ta is the ambient temperature; T1 is an output of the first temperature sensor; T2 is an output of the second temperature sensor; and A and B are constants.
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4. A system for determining ambient temperature comprising:
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a first temperature sensor situated at a first location in an enclosure; a second temperature sensor situated at a second location in the enclosure; a third temperature sensor situated at a third location in the enclosure; a processor connected to the first temperature sensor, the second temperature sensor and the third temperature sensor; and wherein; the processor determines an ambient temperature of a volume proximate to and external of the enclosure based on a three-dimensional relationship representing outputs from the first temperature sensor, the second temperature sensor and the third temperature sensor; the processor generates an equation approximating the three-dimensional relationship; and the processor determines the ambient temperature from the equation; and wherein;
the equation is Ta=(AT1+BT2+CT3+D)/(A+B+C);Ta is the ambient temperature; the output of the first temperature sensor is an indication of a first temperature T1; the output of the second temperature sensor is an indication of a second temperature T2; the output of the third temperature sensor is an indication of a third temperature T3; and A, B, C and D are constants.
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5. A system for determining ambient temperature comprising:
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a first temperature sensor situated at a first location in an enclosure; a second temperature sensor situated at a second location in the enclosure; a third temperature sensor situated at a third location in the enclosure; a processor connected to the first temperature sensor, the second temperature sensor and the third temperature sensor; and wherein; the processor determines an ambient temperature of a volume proximate to and external of the enclosure based on a three-dimensional relationship representing outputs from the first temperature sensor, the second temperature sensor and the third temperature sensor; the output of the first temperature sensor is an indication of a first temperature T1; the output of the second temperature sensor is an indication of a second temperature T2; the output of the third temperature sensor is an indication of a third temperature T3; and the three dimensional relationship is a three-dimensional plot having a first axis representing T1, a second axis representing T2, and a third axis representing T3; and wherein; a first T1, a first T2 and a first T3 determined at a first air flow and a first power input to an apparatus situated in the enclosure, are a first coordinate point T1′
, T2′
, T3′
in the three-dimensional plot;a second T1, a second T2 and a second T3 determined at the first air flow and a second power input to the apparatus, are a second coordinate point T1″
, T2″
, T3″
in the three-dimensional plot;a third T1, a third T2 and a third T3 determined at a second air flow and the first power input to the apparatus, are a third coordinate point T1′
″
, T2′
″
, T3′
″
in the three-dimensional plot;the equation (AT1+BT2+CT3+D)/(A+B+C) is an approximation incorporating the first, second and third coordinate points; and A, B, C and D are constants. - View Dependent Claims (6, 7)
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8. A method for determining ambient temperature comprising:
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determining a first set of temperatures from a first sensor at a first location within an enclosure having an apparatus that generates heat; determining a second set of temperatures from a second sensor at a second location within the enclosure; generating a two-dimensional relationship in a processor having inputs of the first and second sets of temperatures; generating an equation in the processor as an approximation of the two-dimensional relationship; and determining an ambient temperature proximate to the enclosure from the equation with the processor; and wherein; the two-dimensional relationship of the first and second temperatures is generated with the processor from the first and second sets of temperatures determined approximately simultaneously at several levels of power consumed by the apparatus; the first set of temperatures at the several levels of power is represented as a first plot; the second set of temperatures at the several levels of power is represented as a second plot; and the first and second plots are combined into a third plot representing the first set of temperatures versus the second set of temperatures with a portion of the plots representing the several levels of the power dropping out; and further comprising; generating the equation as an approximation of the third plot; and solving for the ambient temperature from the equation; and wherein;
the equation is Ta=(T1−
AT2−
B)/(1−
A);A is a slope of the third plot; B is an offset of the third plot; T1 is a temperature at the first location; and T2 is a temperature at the second location. - View Dependent Claims (9, 10)
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11. A system for determining ambient temperature, comprising:
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a first temperature sensor situated at a first location in an enclosure; a second temperature sensor situated at a second location in the enclosure; and a processor connected to the first temperature sensor and the second temperature sensor; and wherein; the processor determines an indication of ambient temperature of a volume proximate to the enclosure based on a two-dimensional relationship representing outputs from the first temperature sensor and the second temperature sensor; the processor generates an equation approximating the two-dimensional relationship; the processor determines the ambient temperature from the equation;
the equation is Ta=(T1−
AT2−
B)/(1−
A);Ta is the ambient temperature; T1 is an output of the first temperature sensor; T2 is an output of the second temperature sensor; and A and B are constants. - View Dependent Claims (12)
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Specification