Ford Motor Company Limited

Carlos M Barrera

Richard E Soltis

Eleftherios M Logothetis

Margherita Zanini-Fisher

A non-catalytic metal is used as an inner electrode of a heated exhaust gas oxygen sensor to eliminate the negative shift produced in the sensor emf when rich exhaust leaks into the reference compartment.

Hego sensor without characteristic shift down

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 provided 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 compartment of a motor vehicle.

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Milford, MI, United States of America

Carlos M Barrera