Device and method for active noise cancellation in exhaust gas channel of a combustion engine
US7753165B2 · kind B2 · utility
3Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 17, 2008 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Nov 17, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3415
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method and a device for canceling the noise in an exhaust gas channel of a vehicle, a noise signal is received from the exhaust gas channel using a sound sensor, and a frequency signal which has the same amplitude and the opposite phase as the noise signal is generated. The generated frequency signal is acoustically mixed with the noise signal in the exhaust gas channel using a sound converter, there by reducing the noise in the exhaust gas channel. In addition, the temperature in the exhaust gas channel is calculated based on the received sound signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.