Method for calibrating the time response of a mass air flow sensor by laser trimming selected resistors and without an air flow
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United States of America Patent
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Feb 27, 1996
Issued Date -
N/A
app pub date -
Dec 2, 1994
filing date -
Apr 1, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for calibrating the response time of a mass air flow sensor in which the sensors bridge offset voltage is measured and the constant C.sub.I is calculated from the initial value of the bridge offset voltage. C.sub.I is a constant of the heated resistor's resistance in the equation RH=C+(1/I.sub.H) C.sub.I. The response time of the mass air flow sensor is a function of C.sub.I. A bridge offset voltage required to give C.sub.I a desired value is calculated. A pair of biasing resistors are trimmed while monitoring the value of the bridge offset voltage until the monitored value of the bridge offset voltage is equal to the desired value.
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