Stratified exhaust gas recirculation in a S. I. engine

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5758057

Groves, W N; Bjorkhaug, M

Stratified Exhaust Gas Recirculation (SEGR) can enable a spark ignition engine to tolerate more exhaust gas recirculation than when the EGR is premixed in the intake manifold. Experiments were conducted on a VW aircooled engine modified to incorporate exhaust gas transfer ports in the cylinder walls. A unique arrangement of interconnected ports allowed the exhaust blow-down pressure from one cylinder to push EGR into a high swirl velocity during the intake stroke of an opposite cylinder. In-cylinder swirl of the EGR was the stratification mechanism. Evidence of effective stratification is that the engine could tolerate 26% SEGR via the ports but could tolerate only 10% EGR via the intake manifold. The benefit of SEGR is improvement in part-load fuel economy. Efficient part-load operation may be achieved by controlling the amount of SEGR, rather than by throttling the intake. Thus pumping loss is decreased. Gains in fuel economy were measured at 10% in the experimental engine.

• Research Organization: South Dakota School of Mines and Tech.
• OSTI ID: 5758057
• Report Number(s): CONF-860263-
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
330700 -- Advanced Propulsion Systems-- Emission Control
ABSTRACTS
COMPARATIVE EVALUATIONS
CYLINDERS
DOCUMENT TYPES
DYNAMIC LOADS
ENERGY LOSSES
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLUID FLOW
FLUIDS
FUEL ECONOMY
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
LEADING ABSTRACT
LOSSES
MEETINGS
PERFORMANCE TESTING
POLLUTION CONTROL EQUIPMENT
PRESSURE EFFECTS
PUMPING
SPARK IGNITION ENGINES
STRATIFICATION
TESTING
VELOCITY
VORTEX FLOW
WASTES