Method and apparatus to shield an air flow rate meter disposed i

Details Method and apparatus to shield an air flow rate meter disposed i Method and apparatus to shield an air flow rate meter disposed i

1985-03-15

1986-07-15

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

73204, G01M 1500

Patent

active

045998949

ABSTRACT:
A method and apparatus for shielding an air flow rate meter, in particular a hot wire air flow rate meter, or protecting it, from air column fluctuations in the intake tube on an internal combustion engine arising from the non-uniform aspiration of air by the engine. Before the air flow rate meter as viewed from the inlet valve area of the intake tube, elastic diaphragm means are disposed such that they form an interior chamber in the intake tube which is sealed off from the atmosphere on the one hand, yet is embodied such that a virtually constant pressure, which corresponds to atmospheric pressure, can be maintained in it. As a result, pressure waves arriving from the intake tube are absorbed prior to contact with the air flow rate meter and transmitted in terms of their energetic effects to the ambient air, so that the air flow rate meter is uncoupled from the air column fluctuations in the intake tube that are generated by the engine.

REFERENCES:
patent: 4104915 (1978-08-01), Husse
patent: 4311042 (1982-01-01), Hosoya et al.

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