US 2006/0224350 A1Published application

Physical quantity detecting method and sensor device

AssigneeDenso Corporation

InventorYukihiko Tanizawa

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Abstract

A physical quantity is detected by approximating a relationship between an output of a sensor and the physical quantity to be determined by the sensor by setting as coefficients of a quadratic equation a temperature characteristic of non-linearity of the sensor to the physical quantity and temperature characteristics of parameters affecting the output of the sensor. Each of the coefficients is approximated by a higher-order equation with the temperature set as an independent variable, and the temperature coefficient is stored in advance. The temperature coefficient stored in the storage unit and the real-time temperature are substituted into the higher-order equation. The achieved coefficients and the output of the sensor are substituted into the quadratic equation to calculate the actual physical quantity.

Claims9

Dependent claims

A physical quantity detecting method for detecting an actual physical quantity, the method comprising:

approximating a relationship between an output of a sensor and the actual physical quantity to be determined by the sensor by setting as coefficients of a quadratic equation a temperature characteristic of non-linearity of the sensor itself to the physical quantity and temperature characteristics of parameters affecting the output of the sensor;
approximating each of the coefficients by a higher-order equation with the temperature set as an independent variable;
storing the temperature coefficient thereof in a storage unit in advance;
and
on the basis of real-time output of the sensor, executing processing of:
substituting the temperature coefficient stored in the storage unit and the real-time temperature into the higher-order equation to determine the temperature characteristic of the non-linearity of the sensor itself to the physical quantity and the temperature characteristic of the parameters affecting the output of the sensor which are the coefficients of the quadratic equation;
and
substituting the thus-achieved coefficients and the output of the sensor into the quadratic equation to calculate the actual physical quantity to be determined to detect the actual physical quantity.

5 more elements

A sensor device for detecting an actual physical quantity comprising:

a unit for inputting the output of a sensor for detecting a physical quantity;
a storage unit, when the relationship between an output of a sensor and an actual physical quantity to be determined by the sensor is approximated by a quadratic equation defined with the temperature characteristic of non-linearity of the sensor itself to the physical quantity and the temperature characteristics of parameters affecting the output of the sensor set as coefficients, and each of the coefficients is approximated by a higher-order equation with the temperature set as an independent variable, the storage unit being for storing the temperature coefficients thereof;
and
a calculating unit for substituting the temperature coefficient stored in the storage unit and the real-time temperature into the higher-order equation to determine the temperature characteristic of the non-linearity of the sensor itself to the physical quantity and the temperature characteristic of the parameters affecting the output of the sensor which are the coefficients of the quadratic equation, and substituting the thus-achieved coefficients and the output of the sensor into the quadratic equation to calculate the actual physical quantity to be determined to detect the actual physical quantity.

1 more element

Dependencies are inferred from the claim text.