Apparatus for measuring the mass of a flowing medium

Measuring and testing – Simulating operating condition – Marine

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73202, G01F 500

Patent

active

044689578

ABSTRACT:
An apparatus for measuring the mass of a flowing medium, in particular, for measuring the aspirated air mass in internal combustion engines. The apparatus includes a flow conduit for the medium, embodied as an air intake tube and having a restricted section, into which a bypass line toward the restricted section discharges at a mouth. In the bypass line there is a temperature-dependent resistor, which ascertains the mass of air flowing via the bypass line, this mass being at a predetermined proportion to that flowing through the flow conduit of the medium, and this resistor via an electronic control unit triggers a fuel-injection valve in the flow conduit of the medium. The course of the flow cross section in the restricted section is determined by way of example by a shaped body surrounding the fuel injection valve. The mouth of the bypass line is located at the narrowest flow cross section of the restricted section, while downstream of the narrowest cross section and adjacent thereto, the flow cross section is enlarged by an amount which corresponds to the bypass line cross section at the mouth. As a result, undesirable falsification of the measurement signal at the temperature-dependent resistor which might be caused by pulsations in the air flow is prevented.

REFERENCES:
patent: 1143631 (1915-06-01), Keller et al.
patent: 2240119 (1941-04-01), Montgomery et al.
patent: 3443434 (1969-05-01), Baker et al.
patent: 3559482 (1971-02-01), Baker et al.
patent: 4373387 (1983-02-01), Nishimura et al.
patent: 4381668 (1983-05-01), Sato et al.

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