Patent ID: 6230559
Filing Date: 2001-05-15
Classification: F02D,G01F

Abstract:
A temperature-error correcting apparatus for a thermal-type fluid flow measuring instrument, comprising:a first resistance means for detecting a fluid flow rate of a fluid;a second temperature-sensitive reference resistance means for providing a reference value, wherein the value of said second resistance means is a function of the temperature of said fluid and wherein said first and second resistance means are positioned within a passage of said fluid flow;a control circuit for supplying a current to said first resistance means whereby said current flowing through said first resistance means is a signal indicating the fluid flow rate of the fluid;temperature measuring means positioned within said fluid flow passage for providing a temperature output signal;output adjusting circuit for adjusting a zero level of said fluid flow rate signal and for adjusting a gain of said flow rate signal as a function of a predetermined fluid flow rate characteristic,wherein said control circuit further includes a measurement error adjuster connected in series with said second resistance means whereby a value of said adjuster is set so that a measurement error of said fluid flow is constant regardless of the fluid flow rate.