Air-to-fuel ratio control and its effects in a lean-burn natural gas engine
- Univ. of Michigan, Dearborn, MI (United States). School of Engineering
- Ain Shams Univ., Cairo (Egypt). Faculty of Engineering
An experimental investigation was undertaken to examine air-to-fuel (A/F) ratio effects on performance and emission of a fuel injected, lean-burn natural gas engine. An eight cylinder, 4.6 liter spark ignited (SI) engine was used in the study. The engine had a compression ratio of 10.6 and was fuel injected with multi-point injection system. The injection and ignition systems of the engine were controlled by an external controller allowing the engine to operate on equivalence ratios as lean as 0.6. A wide range oxygen sensor, calibrated for natural gas, was used to monitor A/F ratio and its variation at steady state engine operation. The overall A/F ratio variations at lean, steady state operating condition, were found to be very low, an average of about {+-}1%, at an equivalence ratio of 0.6. At these conditions hydrocarbons in engine out exhaust, which were primarily made up of methane, increased to about 13 g/kW-h at medium and relatively high loads while the oxides of nitrogen were significantly reduced to below 0.6 g/kW-h. Furthermore, coefficient of variation in hydrocarbons and oxides of nitrogen were much lower than those realized in an earlier study where a four cylinder engine with gaseous carburetion system was used. The fuel injection system was found to maintain the overall A/F ratio much better than in a gaseous carburetion system thus resulting in very stable engine operation.
- OSTI ID:
- 458394
- Report Number(s):
- CONF-9604188-; ISBN 0-7918-1766-0; TRN: IM9717%%180
- Resource Relation:
- Conference: 1996 spring technical conference of the American Society of Mechanical Engineers internal combustion engine division, Youngstown, OH (United States), 21-24 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 1996 spring technical conference of the ASME Internal Combustion Engine Division. Volume 1: Engine emissions; ICE-Volume 26-1; Uzkan, T. [ed.]; PB: 100 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Selective NOx Recirculation for Stationary Lean-Burn Natural Gas Engines
Improving the performance and fuel consumption of dual chamber stratified charge spark ignition engines