Method and apparatus for calculating sensor modelling coefficients
AssigneeFreescale Semiconductor, Inc.
InventorMahendra Pal Singh
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Abstract
A method of calculating at least one sensor modelling coefficient for multiple sensor regions of operation includes defining a first sensor region of operation and a further sensor region of operation, and calculating the sensor modelling coefficient for the first sensor region of operation. A derivative equation then is derived for the further sensor region of operation based at least partly on at least one defined inter-region boundary constraint. The sensor modelling coefficient is calculated for the further sensor region of operation based at least partly on the derivative equation.
Claims11
A method of calculating at least one sensor modelling coefficient for multiple sensor regions of operation, the method comprising:
- defining a first sensor region of operation and at least one further sensor region of operation;
- defining a first set of sensor modelling equations that comprise at least one sensor modelling coefficient for the first sensor region of operation, and at least one further set of sensor modelling equations that comprise at least one sensor modelling coefficient for the at least one further sensor region of operation;
- calculating the at least one sensor modelling coefficient for the first sensor region of operation;
- deriving at least one derivative equation for the at least one further sensor region of operation based at least partly on at least one defined inter-region boundary constraint, the first set of sensor modelling equations, and the at least one further set of sensor modelling equations;
- calculating the at least one sensor modelling coefficient for the at least one further sensor region of operation based at least partly on the at least one derivative equation;
- and
- storing the calculated coefficient for the first sensor region and the calculated coefficient for the at least one further sensor region in a sensor system for converting a digitized sensor signal to an estimated sensor output signal.
An apparatus comprising at least one signal processing module arranged to calculate at least one sensor modelling coefficient for multiple sensor regions of operation, the at least one signal processing module being arranged to:
- define a first sensor region of operation and at least one further sensor region of operation;
- define a first set of sensor modelling equations that comprise at least one sensor modelling coefficient for the first sensor region of operation, and at least one further set of sensor modelling equations that comprises at least one sensor modelling coefficient for the at least one further sensor region of operation;
- calculate at least one sensor modelling coefficient for the first sensor region of operation;
- derive at least one derivative equation for the at least one further sensor region of operation based at least partly on at least one defined inter-region boundary constraint, the first set of sensor modelling equations, and the at least one further set of sensor modelling equations;
- calculate the at least one sensor modelling coefficient for the at least one further sensor region of operation based at least partly on the at least one derivative equation;
- and
- store the calculated coefficient for the first sensor region and the calculated coefficient for the at least one further sensor region for use in converting at least one digitized sensor signal to an estimated sensor output.
A sensor system, comprising:
- an analog to digital converter that receives a temperature voltage signal and a pressure voltage signal and converts the temperature and pressure voltage signals to digital temperature and pressure voltage signals;
- and
- a signal processor that receives the digital temperature and pressure voltage signals and converts the digital temperature and pressure voltage signals to temperature and pressure values using at least first and second modelling equations having respective first and second sets of coefficients,
- wherein the first set of coefficients is generated by calculating at least one sensor modelling coefficient for multiple sensor regions of operation, comprising:
- defining a first sensor region of operation and at least one further sensor region of operation;
- defining a first set of sensor modelling equations that comprise at least one sensor modelling coefficient for the first sensor region of operation, and at least one further set of sensor modelling equations that comprises at least one sensor modelling coefficient for the at least one further sensor region of operation;
- calculating the at least one sensor modelling coefficient for the first sensor region of operation;
- deriving at least one derivative equation for the at least one further sensor region of operation based at least partly on at least one defined inter-region boundary constraint, the first set of sensor modelling equations, and the at least one further set of sensor modelling equations;
- and
- calculating the at least one sensor modelling coefficient for the at least one further sensor region of operation based at least partly on the at least one derivative equation.
Dependencies are inferred from the claim text.