Engine intake manifold tuning by active noise control

Details Engine intake manifold tuning by active noise control Engine intake manifold tuning by active noise control

1992-04-20

1993-01-05

Okonsky, David A.

Internal-combustion engines

Multiple cylinder

181206, 381 71, F02M 3510

Patent

active

051761149

ABSTRACT:
Two speakers are mounted on an engine air induction system to broadcast respective pressure waves into the induction system. One speaker is near the junction of a runner and a plenum. The other is near the outside air intake. Both speakers are driven by electronic circuitry. The one speaker is driven to introduce a pressure wave that reinforces the portion of a pressure wave from an engine cylinder that is reflected back toward the cylinder by the impedance change that exists at the runner/plenum junction, thereby augmenting the charge introduced into the cylinder. The other speaker is driven to cancel the combined pressure waves that travel toward the air intake and is itself sufficiently close to the air intake that the pressure wave that it emits through the air intake has substantially less energy content than would be the case if such cancellation were not conducted.

REFERENCES:
patent: 4805733 (1989-02-01), Kato et al.
patent: 4889081 (1989-12-01), Ozaki
patent: 4934343 (1990-06-01), Lee
patent: 5048470 (1991-09-01), Geddes et al.

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