Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1995-11-16
1996-11-05
Okonsky, David A.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
12318421, F02M 3510
Patent
active
055712398
ABSTRACT:
A noise control apparatus has a thermal-type air flow meter for detecting engine load, an engine speed sensor for detecting engine speed, and an intake temperature sensor for detecting intake temperature. The engine load is detected based on the surging components of the signal from the air flow meter. An intake pipe is provided with a speaker that produces a noise control wave in accordance with a control signal from a controller. The controller has a memory that stores map data for noise control waves that are equal in sound pressure but opposite in phase with respect to intake noise. The map data regarding sound pressure and phase correspond to the engine load and speed on the basis of a reference temperature. A CPU of the controller computes a map-reading engine speed value based on a wavelength of intake noise that is determined based on intake temperature and engine speed, such that the map-reading engine speed value provides at the reference temperature substantially the same wavelength as that of the intake noise. The CPU generates a noise control wave signal based on the map-reading engine speed value and engine load information.
REFERENCES:
patent: 4506380 (1985-03-01), Matsui
patent: 4805733 (1989-02-01), Kato et al.
patent: 5053598 (1991-11-01), Geddes
patent: 5146505 (1992-09-01), Pfaff et al.
patent: 5176114 (1993-01-01), Brackett
patent: 5485523 (1996-01-01), Tamamura et al.
Kameda Yasutoshi
Kato Naoya
Nishio Yoshitaka
Ohara Kouzi
Tanaka Katsuyuki
Nippondenso Co. Ltd.
Okonsky David A.
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