Method for calibrating the time response of a mass air flow sens

Details Method for calibrating the time response of a mass air flow sens Method for calibrating the time response of a mass air flow sens

1994-12-02

1996-02-27

Chilcot, Richard

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

29620, G01F 100, G01F 2500, H01C 1706

Patent

active

054938929

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.

REFERENCES:
patent: 4474058 (1984-10-01), Drews et al.
patent: 4624138 (1986-11-01), Ono et al.
patent: 4669052 (1987-05-01), Bianco
patent: 5307667 (1994-05-01), Caron
patent: 5311762 (1994-05-01), Drexel
patent: 5390528 (1995-02-01), Zurek et al.

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