Cycle-skipping strategies for pumping loss reduction in spark ignition engines: An experimental approach

► A cycle density variation technique called cycle-skipping was applied. ► Effect on fuel consumption and gaseous emissions was investigated. ► Fuel consumption and gaseous tail-pipe emissions improved at partial loading conditions. Spark ignition (SI) engines are widely used for power generation, e...

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Bibliographic Details
Published in:Energy conversion and management 2012-12, Vol.64, p.320-327
Main Authors: Yueksek, Levent, Oezener, Orkun, Sandalci, Tarkan
Format: Article
Language:English
Subjects:
Applied sciences
Automotive engineering
Automotive engines
Charge
Cycle-skipping
Displacement
Energy
Energy. Thermal use of fuels
Engines and turbines
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Exhaust emission
Gaseous emissions
Partial loading
Pumping loss
Spark ignition
Spark ignition engine
Strategy
Strokes
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Summary:► A cycle density variation technique called cycle-skipping was applied. ► Effect on fuel consumption and gaseous emissions was investigated. ► Fuel consumption and gaseous tail-pipe emissions improved at partial loading conditions. Spark ignition (SI) engines are widely used for power generation, especially in the automotive industry. SI engines have a lower thermal efficiency than diesel engines due to a lower compression ratio, higher charge-induction work and lower end of compression stroke pressure. A significant amount of charge induction work is lost when an SI engine runs under partial loading conditions. Under partial loading conditions, a lower intake charge is required, which can be theoretically achieved by varying the displacement volume or the stroke number of the engine without using a throttle. Reducing the displacement volume to control the engine load can be achieved by skipping cycles in single-cylinder engines. This study investigates the effect of cycle-skipping strategies on the brake specific fuel consumption (BSFC) and exhaust emissions of an SI engine under partial loading conditions. Three different skipping modes were applied: normal, normal-skip and normal-normal-skip. A significant improvement in BSFC and carbon monoxide emission was obtained by applying cycle-skipping strategies.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2012.05.025