Internal combustion engine with exhaust emission control system
A four cylinder spark ignition internal combustion engine has an exhaust emission control system including means for admitting fresh air into the exhaust system in order to promote a further combustion of partly burnt components in the gases coming from the combustion chambers, this means include a ''reed'' valve connected to the exhaust ports leading from the first and fourth cylinders (Numbering from one end of the engine) through internal passages within the cylinder head; the system also comprises an exhaust gas recirculating system comprising a pneumatic valve which opens, when the conditions are appropriate, to draw off a proportion of the exhaust gases from the exhaust side of the engine and admit them to the induction side of the engine taking exhaust gases from branches of the exhaust manifold carrying exhaust gases from the second and third cylinders; in addition there is a system for admitting supplementary air to the induction manifold downstream of the carburetor during engine overrun conditions except when the engine is cold, and the carburetor is provided with supplementary pumps and valves which only function when the engine is cold, being inhibited as the engine approaches its normal working temperature.
- Assignee:
- Fiat Auto S P A (Italy)
- Patent Number(s):
- US 4269029
- OSTI ID:
- 5979354
- Resource Relation:
- Patent Priority Date: Priority date 23 Mar 1978, Italy
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SPARK IGNITION ENGINES
EXHAUST RECIRCULATION SYSTEMS
POLLUTION CONTROL EQUIPMENT
AIR
AIR POLLUTION CONTROL
CARBURETORS
EXHAUST GASES
VALVES
CONTROL
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
FLUIDS
FUEL SYSTEMS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL
WASTES
330700* - Advanced Propulsion Systems- Emission Control
330101 - Internal Combustion Engines- Spark-Ignition