Measuring and testing – Volume or rate of flow – Thermal type
Patent
1981-05-15
1983-08-23
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
73118, G01F 168, G01M 1500
Patent
active
043996981
ABSTRACT:
A gas flow measuring apparatus is provided with an air flow sensor mounted in a suction duct upstream from a throttle valve and exposed to the air flow through the suction duct. The air flow sensor includes a ceramic flat plate mounted in the suction duct so that the main surfaces of the ceramic flat plate are parallel with the air flow. First and second temperature-dependent resistor coatings are formed on the main surfaces of the ceramic flat plate so that the first resistor coating and the second resistor coating are respectively formed on the downstream and upstream end portions of the ceramic flat plate by printing or evaporating a platinum. An electric heater coating is formed between the first and second resistor coatings but spaced therefrom to affect only the first resistor coating, and the heater coating is also formed by printing or evaporating a platinum. The first and second resistor coatings and the electric heater are connected to a measuring circuit to determine the amount of air flow depending on a difference between output signals of the first and second resistor coatings.
REFERENCES:
patent: 3988928 (1976-11-01), Edstrom et al.
patent: 3996799 (1976-12-01), van Putten
patent: 4024761 (1977-05-01), Djorup
patent: 4089214 (1978-05-01), Egami et al.
patent: 4332157 (1982-06-01), Zemel et al.
Malin et al., "Mass Flow Meter" in IBM Tech. Disc. Bulletin, vol. 21, #8, 1/79.
Hiromasa Syunichiro
Kawashima Yutaka
Muto Yukio
Omori Norio
Goldstein Herbert
Nippondenso Co. Ltd.
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