Spark ignition engine operation and design for minimum exhaust emission

Journal Article · · SAE Prog. Technol.; (United States)

DOI:https://doi.org/10.4271/660405· OSTI ID:6647576

Huls, T A; Myers, P S; Uyehara, O A

The purpose of the tests conducted on a single-cylinder laboratory engine was to determine the mechanisms of combustion that affect exhaust emissions and the relationship of those mechanisms to engine design and operating variables. For the engine used in this study, the exhaust emissions were found to have the following dependence on various engine variables. Hydrocarbon emission was reduced by lean operation, increased manifold pressure, retarded spark, increased exhaust temperature, increased coolant temperature, increased exhaust back pressure, and decreased compression ratio. Carbon monoxide emission was affected by air-fuel ratio and premixing the charge. Oxides of nitrogen (NO + NO/sub 2/ is called NO/sub x/) emission is primarily a function of the O/sub 2/ available and the peak temperature attained during the cycle. Decreased manifold pressure and retarded spark decrease NO/sub x/ emission. Hydrocarbons were found to react to some extent in the exhaust port and exhaust system. This reaction appears to follow the Arrhenius rate equation relationship.

• OSTI ID: 6647576
• Journal Information: SAE Prog. Technol.; (United States), Journal Name: SAE Prog. Technol.; (United States) Vol. 12; ISSN SAPTA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701* -- Emission Control-- Nitrogen Oxides
330702 -- Emission Control-- Carbon Monoxide
330704 -- Emission Control-- Hydrocarbons
AIR POLLUTION CONTROL
AUTOMOBILES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
DATA
DESIGN
ENGINES
EXHAUST GASES
EXPERIMENTAL DATA
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
HYDROCARBONS
IGNITION SYSTEMS
INFORMATION
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OPERATION
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PRESSURE DEPENDENCE
SPARK IGNITION ENGINES
TEMPERATURE DEPENDENCE
VEHICLES
WASTES