Variable-displacement spark-ignition engine. Final report

Technical Report · Mon May 01 04:00:00 EDT 1978

OSTI ID:6763349

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

A five-cylinder variable displacement research engine was designed, built, and tested. Displacement is varied by changing the piston stroke using a four-bar linkage. 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. The impact of exhaust gas recirculation on emissions levels was studied experimentally. Several methods for estimating urban fuel economy from dynamometer data predict a 20 to 25% improvement compared with conventional engines at the same emissions levels.

• Research Organization: Sandia Labs., Livermore, Calif. (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 6763349
• Report Number(s): SAND-77-8299
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101 -- Internal Combustion Engines-- Spark-Ignition
330603* -- Vehicle Design Factors-- Engine System
AIR POLLUTION CONTROL
AUTOMOBILES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CYLINDERS
DESIGN
DYNAMOMETERS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FUEL ECONOMY
GASEOUS WASTES
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OPERATION
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PISTONS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SPARK IGNITION ENGINES
TESTING
VEHICLES
WASTES