Investigation of Combustion Robustness in Catalyst Heating Operation on a Spray Guided DISI Engine

Chen, Xiangdong; Fu, Huiyu; Smith, Stephen D.; Sandford, Malcolm H.

doi:10.4271/2009-01-1489

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…Figure 9 shows that split injection does not improve stability compared to single injection. Stability improvement has been observed in prior work done on split injection [4] with very late injection. (In [4], secondary injection took place in the expansion stroke overlapping with the spark event.…”

Section: Split Injection Experimentsmentioning

confidence: 55%

“…Stability improvement has been observed in prior work done on split injection [4] with very late injection. (In [4], secondary injection took place in the expansion stroke overlapping with the spark event. In our experiment, the engine would not operate reliably at such late injection.)…”

Section: Split Injection Experimentsmentioning

confidence: 55%

“…Split injection with an injection during the intake stroke, and a shorter injection late in the compression stroke can provide local enrichment near the spark plug to stabilize early combustion without global mixture enrichment. [4]. Split injection also diminishes fuel jet wall wetting, thereby reduces engine-out emissions.…”

Section: Split Fuel Injectionmentioning

confidence: 99%

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SI Engine Control in the Cold-Fast-Idle Period for Low HC Emissions and Fast Catalyst Light Off

Cedrone¹,

Cheng²

2014

SAE Int. J. Engines

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The engine and its exhaust flow behaviors are investigated in a turbo-charged gasoline direct injection engine under simulated cold-fast-idle condition. The metrics of interest are the exhaust sensible and chemical enthalpy flows, and the exhaust temperature, all of which affect catalyst light off time. The exhaust sensible enthalpy flow is mainly a function of combustion phasing; the exhaust chemical enthalpy flow is mainly a function of equivalence ratio. High sensible and chemical enthalpy flow with acceptable engine stability could be obtained with retarded combustion and enrichment. When split injection is employed with one early and one later and smaller fuel pulse, combustion retards with early secondary injection in the compression stroke but advances with late secondary injection. Comparing gasoline to E85, the latter produces a lower exhaust temperature because of charge cooling effect and because of a faster combustion.

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Section: Split Injection Experimentsmentioning

confidence: 55%

Section: Split Injection Experimentsmentioning

confidence: 55%

See 1 more Smart Citation

SI Engine Control in the Cold-Fast-Idle Period for Low HC Emissions and Fast Catalyst Light Off

Cedrone¹,

Cheng²

2014

SAE Int. J. Engines

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“…A lot of studies on cycle-to-cycle variation of combustion with spark-ignition (SI) engines under cold-start condition have been conducted. 14–20 At cold start of an engine, ignition timing is substantially retarded to expansion stroke from Minimum spark advance for best torque (MBT). Russ et al 15 described that the primary cause of cycle-to-cycle variation of indicated mean effective pressure (IMEP) is variations in the combustion phasing (location of 50% mass fraction burned) under the retarded ignition condition.…”

Section: Introductionmentioning

confidence: 99%

“…The main purpose of the split injection is to keep rich mixture close to the spark plug by the SI timing by controlling the second injection of fuel. 18 Chen et al 19 and Twiney et al 20 analyzed an initial phase of combustion by optical measurements and concluded that misfire (here, this is failure of SI) in the spray guided combustion was induced by high-speed flow close to the spark plug and wetting by liquid fuel. The results obtained in these studies are effective for an engine design and optimization of combustion; however, the mechanism of cycle-to-cycle variation of combustion still remains unclear due to the lack of quantitative data of in-cylinder phenomena.…”

Section: Introductionmentioning

confidence: 99%

An investigation for reducing combustion instability under cold-start condition of a direct injection gasoline engine

Kimura

Mori

Kawauchi

et al. 2018

International Journal of Engine Research

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In order to meet recent stringent emission regulations, the exhaust catalyst should be heated as early as possible to activate the purifying reactions. In a direct injection spark-ignition engine, a combination of late fuel injection during the compression stroke and late ignition in the expansion stroke is a common strategy to quickly raise exhaust gas temperature for subsequent rapid activation of exhaust catalysts. However, this approach under cold start-up of an engine often results in incomplete and unstable combustion. In this study, to explore the conditions of stable ignition and combustion, the effect of injection timing on indicated mean effective pressure and early combustion duration (MBD0.5) are first investigated by an analysis of the pressure indicator diagram. As this analysis shows a strong correlation between indicated mean effective pressure and MBD0.5, the mechanism of initial flame propagation is investigated intensively using optical diagnostics. Namely, mean equivalence ratio of mixtures in the propagating flame front is measured by focusing on the ratio of C 2 * to CH* emission intensities. The flow velocity and turbulence intensity around the spark electrode are measured by the back-scattering laser Doppler anemometry. Two major conclusions are derived from this study: First, when the injection timing is retarded, the mean equivalence ratio increases as the time for the injected fuel to travel and diffuse is shortened. The most preferable mean equivalence ratio for fast initial combustion is found to lie in a range from 1.2 to 1.4. Second, when the second injection timing is retarded further, the mean equivalence ratio increases exceeding 1.4, and this results in slower and more fluctuated initial flame propagation. But, if the turbulent intensity is increased by means of the spray induced air motion, the slowed initial combustion can be recovered.

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The All New AJV8

Sandford¹,

Page²,

Crawford³

2009

SAE Technical Paper Series

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Investigation of Combustion Robustness in Catalyst Heating Operation on a Spray Guided DISI Engine

Cited by 5 publications

References 7 publications

SI Engine Control in the Cold-Fast-Idle Period for Low HC Emissions and Fast Catalyst Light Off

SI Engine Control in the Cold-Fast-Idle Period for Low HC Emissions and Fast Catalyst Light Off

An investigation for reducing combustion instability under cold-start condition of a direct injection gasoline engine

The All New AJV8

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