Ambient temperature estimation
First Claim
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1. A temperature sensing system for movable vehicles, the system comprising:
- a temperature sensor configured to mount to a vehicle to measure a temperature of air defining an ambient temperature;
a controller operably connected to the temperature sensor and obtaining a plurality of temperature readings from the temperature sensor at distinctly different times;
wherein a rate of change of the temperature of the readings from the temperature sensor when the temperature sensor is exposed to air at an ambient temperature is generally equal to a time factor multiplied by a difference between a temperature reading of the temperature sensor at a plurality of selected times and an ambient temperature at the selected times such that a difference between the temperature readings and an ambient temperature is reduced over time until the temperature readings are about equal to the ambient temperature; and
wherein;
the controller utilizes predefined data concerning the time factor to estimate the ambient temperature utilizing a plurality of temperature readings taken at selected times at which there is a significant difference between at least some of the temperature readings.
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Abstract
A method for predicting an ambient temperature around a moving motor vehicle includes utilizing measured ambient temperatures and Newton'"'"'s Cooling Law. A linear best fit line describing the time constant as a function of vehicle speed can be generated utilizing measured data. In use, the b values can be determined from the best fit line, and the b values can be utilized to provide a predicted or estimated ambient temperature before the measured temperatures drop to the ambient temperature.
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Citations
20 Claims
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1. A temperature sensing system for movable vehicles, the system comprising:
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a temperature sensor configured to mount to a vehicle to measure a temperature of air defining an ambient temperature; a controller operably connected to the temperature sensor and obtaining a plurality of temperature readings from the temperature sensor at distinctly different times; wherein a rate of change of the temperature of the readings from the temperature sensor when the temperature sensor is exposed to air at an ambient temperature is generally equal to a time factor multiplied by a difference between a temperature reading of the temperature sensor at a plurality of selected times and an ambient temperature at the selected times such that a difference between the temperature readings and an ambient temperature is reduced over time until the temperature readings are about equal to the ambient temperature; and
wherein;the controller utilizes predefined data concerning the time factor to estimate the ambient temperature utilizing a plurality of temperature readings taken at selected times at which there is a significant difference between at least some of the temperature readings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of estimating an ambient temperature of air that is external to a motor vehicle, the method comprising:
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providing a temperature sensor configured to mount to a vehicle to measure temperature of air defining an ambient temperature; determining a rate of change of temperature readings for a vehicle as a function of temperature differences between a measured temperature and an ambient temperature; providing a controller that is operably connected to the temperature sensor; obtaining a plurality of temperature readings from the temperature sensor at distinctly different times; configuring the controller to estimate the ambient temperature utilizing a plurality of temperature readings taken at selected times at which there is a significant difference between at least some of the temperature readings. - View Dependent Claims (11, 12, 13, 14)
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15. A method of estimating ambient temperature of air around a vehicle, comprising:
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providing a vehicle with a sensor having a rate of change of temperature that is equal to the product of a factor and a difference between a measured temperature and an ambient temperature; describing the factor as a function of vehicle speed; utilizing measured temperatures at known times and vehicle speeds to calculate two values of the factor and an estimated temperature. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification