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US 9,435,694 B2Granted
Outside air temperature measurement device and method
AssigneeKelsey-Hayes Company
InventorThomas Gregory Hubert
Life of this patent
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Abstract
An outside air temperature measurement device and method for vehicles derives a useable final value of the outside air temperature within seconds of the beginning of vehicle movement by developing a mathematical expression (i.e., model) for the exponential data series while discriminating against thermal noise components existing in the measurement data.
Claims9
A computer implemented method for measuring outside air temperature comprising the steps of:
- measuring temperature values over time, acquiring the temperature values from a sensor;
- determining a first order exponential decay of the measured values in real time that is based on a measured initial temperature value and a transient response step size comprising the estimated time constant of exponential decay;
- predicting a final value of the first order exponential decay series using a mathematical model based on the magnitude of the transient response step size;
- and
- discriminating against thermal noise components existing in the temperature values to arrive at a final temperature value.
2 more elements
A system for measuring outside air temperature comprising:
- a plurality of sensors to measure temperature values over time;
- a controller comprising computer executable instructions in communication with the plurality of sensors, the controller configured to:
- analyze the measured temperature values;
- stabilize an exponential time decay constant by applying a least squares approximation based on the analyzed temperature values;
- estimate a step size based on the stabilized exponential time decay constant;
- determine a first order exponential decay of the analyzed temperature values in real time based on a measured initial temperature value and the step size;
- predict a final value of an exponential decay series using a mathematical model based on the step size;
- and
- filter the predicted final value against thermal noise components existing in the temperature values based on the stabilized exponential time decay constant to arrive at a final temperature value.
6 more elements
Dependencies are inferred from the claim text.