Patent ID: 6467359
Filing Date: 2002-10-22
Classification: G01F

Abstract:
Improvement in a mass air flow meter having an elongated hollow body having a venturi therein, a sample tube associated with said body for receiving a flow of sample air therethrough, the entire air source for the meter being split into a main flow path through the venturi and into a sample path through the sample tube, the sample tube constructed to receive therein near the downstream end thereof an air flow transducer, a collection chamber for accumulating the sample air flow exiting from the sample tube, flow restriction means at the throat of the venturi serving as the outlet of said collection chamber where the sample air is recombined with the main air flow through the venturi, said improvement comprising a static pressure manifold disposed upstream from the sample tube and capable of accumulating a volume of air therein, said static pressure manifold having inlet means therefor in communication with the kinematic main air flow traveling through said hollow body toward said venturi, said inlet means being disposed in respect to the path of travel of such main air flow so as to be capable of sensing different static pressures thereof, said static pressure manifold having a single outlet therefor serving as the sole inlet for the sample path of air entering the sample tube to be measured by said air flow transducer, the static pressure of the air accumulated in the static pressure manifold being such that it functions as a resultant average of the different static pressures sensed at the inlet means thereof, said static pressure manifold providing for the sample air being measured in said sample tube substantial immunity in respect to turbulent air flow upstream from the meter.