Reducing acoustic noise of an engine having...

Details Reducing acoustic noise of an engine having... Reducing acoustic noise of an engine having...

2006-09-12

2006-09-12

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

C123S090110

Reexamination Certificate

active

07104243

ABSTRACT:
A system and method for controlling randomly operable valves in an engine is presented. According to the method, valve lift is used to create a Helmholtz resonator from a deactivated cylinder. The method can reduce engine pressure based audible noise for variable displacement engines.

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patent: 2005/0205045 (2005-09-01), Michelini et al.
patent: 2004-278535 (2004-10-01), None

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