Throttle body with internally mounted anemometer

F - Mech Eng,Light,Heat,Weapons – 02 – M

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F02M 69/00 (2006.01) F02M 69/46 (2006.01) F02M 69/48 (2006.01) G01F 1/68 (2006.01) G01F 1/684 (2006.01) G01F 1/69 (2006.01) G01F 5/00 (2006.01)

Patent

CA 1277193

THROTTLE BODY WITH INTERNALLY MOUNTED ANEMOMETER Abstract of the Invention A throttle body for an internal-combustion engine having a hollow venturi member positioned within the body. The member has a first portion projecting out of the body at its intake end, and a second portion positioned generally centrally within the body air duct upstream from a throttle plate. The second portion has an exterior surface spaced inward from the body interior sidewall to form an annular venturi passage therebetween. The first and second portions define an enclosed air channel. Circumferentially distributed entry openings in the first portion open exterior of the body duct for entry of air into the channel, and circumferentially distributed exit openings in the second portion communicating with the venturi air passage for the exit of air from the channel. The channel and the entry and exit openings define a sample flow path of air from a location exterior of the duct to a location adjacent to the venturi passage representative of the air mass flow through the duct. An anemometer sensor is positioned in the channel in the sample airflow path. The first portion of the venturi member has a bluff body shape to create a low pressure zone thereabout when air through the body duct is reversed to substantially eliminate airflow through the venturi member as a result of engine backflow pulsations.

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