The mandatory emission regulations coupled with market demands have resulted in the development of innovative engine technologies at lower costs for consumer applications. For example, the low cost two-stroke engines for hand-held applications have evolved from high specific output, high emission designs to lower emission engine architectures that meet today's EPA and CARB emission standards. Emissions and fuel consumption have reduced significantly, particularly in non-catalyzed engines. This paper highlights the design features of a Multi-Layered Stratified (MuLS) engine that has demonstrated the ability to meet the current emission standards without the catalyst. The Multi-Layer scavenging system consists of stratified layers of pure air, lean air-fuel mixture, and rich air-fuel mixture that are inducted separately and delivered in sequence into the combustion chamber through ports for minimizing the scavenging loss of the unburned fuel. A 25.4cc production two-stroke engine was modified to demonstrate the proof of the concept.
Multi-Layer Stratified (MuLS) Two-Stroke Engine
Sae Technical Papers
2012 Small Engine Technology Conference & Exhibition ; 2012
2012-10-23
Aufsatz (Konferenz)
Englisch
Multi-Layer stratified scavenging ( MULS ) - a new scavenging method for two-stroke engines
Kraftfahrwesen | 1984
|Multi-Layer Stratified Scavenging (MULS) - A New Scavenging Method for Two-Stroke Engine
SAE Technical Papers | 1984
|Performance characteristics of stratified charge two-stroke engine
Kraftfahrwesen | 1992
|Stratified charged two-stroke engine CFD development and verification
Springer Verlag | 2017
|