Vortex shedding device for use in measuring air flow rate...

Details Vortex shedding device for use in measuring air flow rate... Vortex shedding device for use in measuring air flow rate...

G - Physics

01

F

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G01F 1/32 (2006.01) F02D 41/18 (2006.01)

Patent

CA 1051225

VORTEX SHEDDING DEVICE FOR USE IN MEASURING AIR FLOW RATE INTO AN INTERNAL COMBUSTION ENGINE ABSTRACT OF THE DISCLOSURE A vortex shedding device for use in measuring air flow rate into an internal combustion engine includes a conduit having a passage within it that includes a venturi section preferably of rectangular cross-section throughout. The conduit has four walls defining the venturi section and passage, and at least one of the walls has a recess formed in it. An elongated element for generating vortices in air flowing in the passage extends transverse to the direction of air flow through the throat portion of the venturi section. Circuit means are pro- vided for determining the frequency at which vortices are generated, and such circuit means are located in the recess formed in the one wall of the conduit. A cover encloses the recess and circuit means within. The cover includes means for establishing a thermal barrier between the circuit means and the medium in which the vortex shedding device is immersed, typically this medium being the air within the engine compart- ment of a motor vehicle.

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