Intake air density sensor for an internal combustion engine

Details Intake air density sensor for an internal combustion engine Intake air density sensor for an internal combustion engine

1979-10-26

1982-03-23

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Density or specific gravity

73725, 73729, G01N 932

Patent

active

043206522

ABSTRACT:
An intake air density sensor for an internal combustion engine comprises a receptacle in the form of a flask including a spherical chamber and a tubular portion having a very fine diameter, a pressure responsive casing at least whose part is made of an elastomeric membrane and communicated with the receptacle, a gas and a conductive liquid hermetically sealed in the receptacle and pressure responsive casing, respectively, so as to locate a boundary surface between the gas and liquid in the tubular portion, and a resistor longitudinally arranged in the tubular portion so as to form short-circuiting means by the conductive liquid for the resistor, thereby detecting densities of a fluid to be measured by converting variations in pressure of fluid into variations in volume of the pressure responsive casing or sealed gas and further converting variations in position of the boundary surface of the conductive liquid into values of electrical resistances of the resistor without affecting the positional movement of the boundary surface to convert variations in density of the fluid into electrical signals with high detecting sensitivities and high accuracies.

REFERENCES:
patent: 2703494 (1955-03-01), Carney
patent: 2931225 (1960-04-01), Pleuger
patent: 3258966 (1966-07-01), St. Coeur

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