Exhaust gas purifying apparatus for multicylinder internal combustion engines
Patent
·
OSTI ID:6575349
An exhaust gas purifying apparatus is described that has an exhaust pipe divided into at least two branches each connected to a different cylinder or cylinders. Each of the exhaust pipe branches is further connected to a secondary air supply tube to intermittently supply secondary air upstream of a three-way catalyst disposed in the branch thereby to vary periodically within a range the air-fuel ratio of exhaust gases flowing into the three-way catalyst.
- Assignee:
- Nippon Soken Inc (Japan)
- Patent Number(s):
- US 4240254
- OSTI ID:
- 6575349
- Country of Publication:
- United States
- Language:
- English
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