A fuel injection study was performed on a Briggs and Stratton SI engine rated at 3.73 kW. By switching to a fuel injection system, the operational range was extended over an equivalence ratio, ϕ, range of 0.72 to 1.40. The maximum brake thermal efficiency and minimum bsfc of 24% and 331 g/kWh respectively occurred at ϕ = 0.93. However, the best operating condition to meet high performance and current emission requirements occurs at ϕ = 1.10. Performance and emission results of the baseline tests were compared to those obtained through variation of the injection timing between 29°BTDC and 49°ATDC. It was concluded that injection timing had no significant effect on any engine performance or emissions as long as the equivalence ratio is held constant.
The Effect of Fuel Manifold Injection and Injection Timing on Performance and Emissions for a Spark Ignition Engine
Sae Technical Papers
Small Engine Technology Conference & Exposition ; 2003
2003-09-16
Aufsatz (Konferenz)
Englisch
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