Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1990-03-07
1991-08-27
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Idle speed control
123481, 123198F, 123335, F02D 4116, F02D 1702
Patent
active
050424440
ABSTRACT:
An apparatus and method for altering the acoustic signature of an internal combustion engine is disclosed. Several techniques for altering the acoustic signature of an engine are shown, including time-varying, disabling or cutout of individual cylinders of an engine in a random fashion in order to reduce the periodic characteristics of the exhaust noise of the engine. Alternate embodiments include offsetting crank pins to transform an even firing engine into an uneven firing engine, inhibiting the fueling of individual cylinders, and inhibiting the ignition signals provided to individual cylinders. A combination of the above techniques may also be implemented in order to disperse the exhaust noise energy present over a wide frequency range, making acoustic detection of the exhaust signature difficult. Cylinder cutout schemes are implemented over a single or multiple engine cycle to disperse exhaust noise pulses over time and randomize measurable spectral noise composition.
REFERENCES:
patent: 4070971 (1978-01-01), Studebaker
patent: 4146006 (1979-03-01), Garabadian
patent: 4351202 (1982-09-01), Summes
patent: 4367716 (1983-01-01), Yasuhara
patent: 4391255 (1983-07-01), Staerzl
patent: 4469071 (1984-09-01), Bassi et al.
patent: 4470390 (1984-09-01), Omori et al.
patent: 4509488 (1985-04-01), Forster et al.
patent: 4519344 (1985-05-01), Ohyama et al.
patent: 4530332 (1985-07-01), Harvey et al.
patent: 4541387 (1985-09-01), Morikawa
patent: 4550704 (1985-11-01), Barho et al.
patent: 4552114 (1985-11-01), Sano et al.
patent: 4556026 (1985-12-01), Masuda et al.
patent: 4608952 (1986-09-01), Morita et al.
patent: 4640241 (1987-02-01), Matsunaga
patent: 4722308 (1988-02-01), Wall
patent: 4727844 (1988-03-01), Morita et al.
patent: 4794893 (1989-01-01), Masuda et al.
Hayes Paul A.
Reinhart Thomas E.
Shaw Terrence M.
Cummins Engine Company, Inc.
Wolfe Willis R.
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