Effect of Injection Timing Retard on ISI Strategy in Lean-burning LPG Direct Injection Engines

Park, Cheolwoong; Park, Yunseo; Oh, Sung‐Yong; Lee, Yonggyu; Kim, Tae Young

doi:10.4271/2013-01-2636

Cited by 8 publications

(8 citation statements)

References 26 publications

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“…In fact, the effects of different excess air ratios on performance and emission were reported in previous studies [6,7]. To ensure the combustion stability of LPG lean burn operation, a modified multiple-injection strategy was adopted, designated as the inter-injection spark ignition (ISI), as introduced in a previous study [6].…”

Section: Resultsmentioning

confidence: 99%

“…However, the optimal fuel injection, spark ignition timing, and ratio of injected fuel amount can differ according to the operating point. As the formation of an appropriate stratified mixture is difficult with a single injection at a certain operating condition, multiple injection strategies were employed in the previous studies [7,16,17,22,25]. In the present study, a two-staged injection strategy is applied and optimized.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental engine setup in this study is the same as that used in previous researches [6,7,22]. The head of the 2.0 L gasoline engine with a port fuel injection system was redesigned for the development of an ultra-slim LPG direct-injection engine, and therefore the position of the spark plug and fuel injector, were altered to conform to the requirements of the spray-guided combustion system.…”

Section: Methodsmentioning

confidence: 99%

“…Energies 2016, 9, 920 3 of 11 strategies on particulate emissions. In addition, studies on lean-burn LPG direct-injection engines with spray-guided combustion systems have been conducted as a part of future engine technology development [6,7,22]. However, the engine performance is greatly affected by the spray shape and spark plug performance.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we report the comparison analysis Energies 2016, 9, 920 3 of 12 of gasoline and LPG from direct-injection light-duty vehicles and evaluated the effect of engine control strategies on particulate emissions. In addition, studies on lean-burn LPG direct-injection engines with spray-guided combustion systems have been conducted as a part of future engine technology development [6,7,22].…”

Section: Introductionmentioning

confidence: 99%

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Combustion and Emission Characteristics According to the Fuel Injection Ratio of an Ultra-Lean LPG Direct Injection Engine

et al. 2016

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Abstract:The effect of the fuel injection ratio on the combustion and emission characteristics of stratified lean mixture combustion was investigated for a spray-guided liquefied petroleum gas (LPG) direct injection engine. Inter-injection spark-ignition combustion-a specially designed combustion strategy for LPG fuel derived from a two-staged injection-was employed to maximize the improvement in thermal efficiency when combustion stability is secured. When changing the fuel injection ratio, the optimum spark advance and fuel injection timings were experimentally determined to maximize the thermal efficiency based on sweeping timings. The optimum fuel injection ratio with the highest thermal efficiency (42.76%) and stable operation was 60%/40%, with the optimization of the spark advance and fuel injection timing, because of the locally rich mixture region in the recirculation zone. NO x emissions were at their highest level with a fuel injection ratio of 60%/40% because of the high combustion temperature, and the levels of total hydrocarbon and CO emissions with 50%/50% and 60%/40% fuel injection ratios were similar, whereas emissions at 70%/30% were significantly higher because of fuel wetting and the formation of over-lean mixture.

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Section: Resultsmentioning

confidence: 99%