Method and apparatus for controlling sound of an engine by sound frequency analysis
US7155333B1 · kind B1 · utility
11Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2005 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Sep 2, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/025
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An apparatus for controlling sound of an engine comprises a sound sensor, an exhaust valve, and a controller. The controller is configured to determine a sound level of a peak sound frequency within a predetermined sound frequency range by use of output from the sound sensor, compare the sound level of the peak sound frequency to a predetermined sound level, and change the position of the exhaust valve based on the comparison between the sound level of the peak sound frequency and the predetermined sound level. An associated method is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.