Apparatus for controlling exhaust gas in internal combustion engine
US6595320B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Aug 21, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N1/166
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An apparatus for controlling exhaust noise in an internal combustion engine uses the length difference between the exhaust pipe and the bypass pipe. The apparatus includes an exhaust pipe for outwardly releasing exhaust gas from the engine; a bypass pipe variable in length which diverges from said exhaust pipe with a distance and has U-shaped and reverse U-shaped sections formed alternately; an actuator having an actuating rod connected to the bypass pipe to vary the length of the bypass pipe; and a control unit for controlling the actuator. The bypass pipe has the U-shaped and reverse U-shaped sections arranged alternately so that the variable length of the bypass pipe can be extended while minimizing the space for installing the bypass pipe, and thereby noise in the low frequency band can be suitably reduced. Also, the exhaust pipe is additionally provided with a device for adjusting the length to increase the length difference with the bypass pipe so that noise in a wider band can be controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.