Measuring and testing – Volume or rate of flow – Thermal type
Patent
1995-09-06
1997-05-13
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Thermal type
7320416, G01F 168
Patent
active
056294816
ABSTRACT:
A mass air flow measurement system comprising a sensing device located in an air flow providing an output signal relational to an mount of mass air flow past the device, wherein the sensing device has an inherent sensor response time constant and acts to low pass filter the output signal; and a first filter stage coupled to the output of the sensing device receiving the output signal, wherein the first filter stage is a high pass filter with a first filter time constant substantially equal to the sensor response time constant and provides, at a first filter output, a high pass filter output signal, wherein the first filter stage compensates for inaccuracies in the output signal caused by the inherent sensor response time when the air flow pulses cyclically at time periods on the order of the inherent sensor response time constant.
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Breakthrough in Reverse Flow Detection-A New Mass Air Flow Meter Using Micro Silicon Technology, SAE Technical Paper Series No. 950433, International Congress & Exposition Detroit, Michigan, Feb. 27-Mar. 2, 1995.
Artis Jewel V.
Chilcot Richard
General Motors Corporation
Simon Anthony Luke
LandOfFree
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