Exhaust recirculation
An exhaust gas recirculation system for the reduction of nitrogen oxide emissions from internal combustion engine exhaust is described that is uncomplicated by moving parts, thus avoiding problems associated with prior-art recirculation systems. The system also results in preheating and improved mixing of the fuel-air mixture in the inlet header. A recycling duct receives the exhaust gases at a restricted upstream end of the exhaust system and passes in heat exchange relationship through a conventional intake manifold hot spot to facilitate heating of the latter. The hot exhaust gases are discharged at a restricted downstream end of the exhaust system in opposition to the inlet flow of the fuel-air mixture directly below the throttle valve. A second restricted duct that extends within the sidewall of the carburetor inlet induction conduit and bypasses the throttle valve opens into the induction conduit upstream of the throttle valve to receive inlet gases during idle. The second duct discharges into the recycling duct between the latter's upstream and downstream restrictions to inhibit exhaust flow through the recycling duct during engine idle operation.
- Assignee:
- Chrysler Corp.
- Patent Number(s):
- US 3827412
- OSTI ID:
- 7232446
- Country of Publication:
- United States
- Language:
- English
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Exhaust gas recirculation system for an internal combustion engine
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Related Subjects
330701* -- Emission Control-- Nitrogen Oxides
AIR POLLUTION CONTROL
CHALCOGENIDES
CONTROL EQUIPMENT
DESIGN
DUCTS
ENERGY TRANSFER
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
GASEOUS WASTES
HEAT TRANSFER
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
VALVES
WASTES