METHOD FOR APPROXIMATING PRESSURE SENSOR CHARACTERISTIC, METHOD FOR ACQUIRING PRESSURE SENSOR CHARACTERISTIC, METHOD AND DEVICE FOR CALCULATING PRESSURE USING APPROXIMATED CHARACTERISTIC, METHOD AND DEVICE FOR CALCULATING PRESSURE USING ACQUIRED CHARACTERISTIC, RECORDING MEDIUM FOR STORING APPROXIMATED CHARACTERISTIC, AND METHOD FOR DETERMINING ABNORMALITY IN PRESSURE SENSOR

摘要

PROBLEM TO BE SOLVED: To approximate the characteristic of a pressure sensor using a combination of as few approximate equations as possible, as well as suppress an error in the approximation.;SOLUTION: The present invention comprises: a characteristic measurement step of measuring correspondence between output voltage and pressure at prescribed intervals from a first pressure to a second pressure; a reference characteristic calculation step of calculating a reference characteristic linking a first point specified by the first pressure and an output voltage corresponding thereto and a second point specified by the second pressure and an output voltage corresponding thereto; a deviation calculation step of calculating a deviation in pressure from the calculated reference characteristic at each output voltage in the measured correspondence; a boundary voltage calculation step of making a voltage for which the calculated deviation becomes maximum or minimum to be a boundary voltage; an approximate equation calculation step of calculating an approximate equation linking points at which the boundary voltages adjoin each other among the points specified by the calculated boundary voltage and a pressure corresponding to the boundary voltage in correspondence; and a storage step of storing the calculated approximate equation and the boundary voltage corresponding to the approximate equation.;COPYRIGHT: (C)2015,JPO&INPIT