Variable-displacement spark-ignition engine

Conference · Sat Jan 01 04:00:00 EST 1977

OSTI ID:7313976

Pouliot, H N; Delameter, W R; Robinson, C W

A five-cylinder variable displacement research engine has been designed, built, and tested for over one year. Displacement is varied by changing the piston stroke using a four-bar linkage. By proper choice of the linkage dimensions, compression ratio can be held constant as the stroke changes, or it can be tailored to optimize economy and performance. Before the engine was built, its dynamics were thoroughly analyzed, and a five-cylinder configuration was selected to minimize vibration. Test data show that BSFC is, as expected, less dependent on load than in conventional engines, and averages less than 0.5 lb/bhp-hr over the load and speed range of ordinary automobile operation. Several methods for estimating urban fuel economy from dynamometer data predict a significant improvement compared with conventional engines. Emission controls have not yet been applied to this engine.

• OSTI ID: 7313976
• Report Number(s): CONF-770205-69
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
330701 -- Emission Control-- Nitrogen Oxides
330702 -- Emission Control-- Carbon Monoxide
330704 -- Emission Control-- Hydrocarbons
AUTOMOBILES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CYLINDERS
DESIGN
DYNAMOMETERS
ENGINES
EXHAUST GASES
FUEL ECONOMY
GASEOUS WASTES
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OPERATION
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POWER
SPARK IGNITION ENGINES
TESTING
VEHICLES
WASTES