A review of technological approaches for reducing exhaust emissions from two-stroke cycle engine with in-cylinder injection system
From the investigations carried out in the two-stroke cycle engine with in-cylinder injection system, it was found that the level of hydrocarbon emissions from the engine was still too high if compared to that of an ordinary four-stroke cycle engine. For such high level of hydrocarbon emissions, it could be identified as coming from the mixture misfiring during the combustion process rather than the mixture short-circuiting during the scavenging process. The reasons for inducing the occurrence of mixture misfiring were also under investigation and could be further classified into five major categories: poor atomization of fuel spray, excessive amount of residual gas, instability of in-cylinder air flow, wall-wetting of the injected fuel spray and phenomena of secondary fuel injection. For assessing the effects of these technological approaches, the following statements could be drawn: (a) an air-assisted fuel injection system is to improve the fuel atomization; (b) the approach of skip injection control could effectively resolve the problem of mixture misfiring at idling, (c) through the control of the in-cylinder air flow by using a exhaust charge control valve, the irregularity of combustion could be substantially improved through the light load range; (d) increasing the temperature of the combustion chamber seems to be a necessary technology approach in order to assist the evaporation of wall-wetted fuel in the light load range; (e) while the design modification of injection nozzle is to resolve the problem of the secondary injection which is usually associated with the air-assisted injection system, especially at higher loads.
- OSTI ID:
- 253597
- Report Number(s):
- CONF-950942-; ISBN 1-56091-673-7; TRN: IM9630%%48
- Resource Relation:
- Conference: Small engine technology conference and exposition, Milwaukee, WI (United States), 13-15 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the 1995 small engine technology conference: Small engines and the environment. P-292; PB: 497 p.
- Country of Publication:
- United States
- Language:
- English
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