PCCI Investigation Using Variable Intake Valve Closing in a Heavy Duty Diesel Engine

Nevin, Ryan; Sun, Yong; Gonzalez, A D Manuel; Reitz, Rolf D.

doi:10.4271/2007-01-0903

Cited by 73 publications

(39 citation statements)

References 13 publications

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“…Plotting local states on an equivalence ratio-temperature map showed local peak values of temperature and equivalence ratio were lowered, moderating NO x and soot formation during combustion. Nevin et al [15] examined the use of LIVC with early injection timings of 55 CA BTDC (before top dead centre) and 40% EGR at low load, observing that NO x was lower at high-speed medium-load conditions. In their experimental work, He et al [12] suggest that the reduction in soot emissions achieved using LIVC is attributable to the extended ignition delay allowing greater time for mixing to reduce local fuel-rich regions.…”

Section: Introductionmentioning

confidence: 98%

The effects of early inlet valve closing and cylinder disablement on fuel economy and emissions of a direct injection diesel engine

Zammit

McGhee

Shayler

et al. 2015

Energy

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a b s t r a c tThe influence of EIVC (early inlet valve closure) on emissions, fuel economy and exhaust gas temperature of a turbocharged, 4 cylinder common rail direct injection diesel engine has been investigated and compared with the influence of deactivating two cylinders. IVC (inlet valve closing) timings were set at up to 60 CA (crank angle) degrees earlier than the production setting of 37 ABDC for the engine. At the earliest timing, effective compression ratio was reduced from 15.2:1 to 13.7:1. The effects on emissions were significant only for EIVC settings at least 40 CA degrees earlier than the production setting, and were sensitive to engine load. At 2 bar BMEP (brake mean effective pressure) and fixed levels of NO x , soot emissions were reduced but CO (carbon monoxide) and HC (hydrocarbon) increased unless fuel rail pressure was reduced. With increasing load, soot reduction diminished and was negligible at 6 bar BMEP; CO and HC emissions deteriorated further. At all conditions, EIVC raised exhaust gas temperature by >50 C; the effect on fuel economy was negligible or a fuel economy penalty. Comparisons indicate cylinder deactivation is the more effective strategy for reducing engine-out emissions of HC and CO and raising exhaust gas temperature under light load operating conditions.

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Section: Introductionmentioning

confidence: 98%

The effects of early inlet valve closing and cylinder disablement on fuel economy and emissions of a direct injection diesel engine

Zammit

McGhee

Shayler

et al. 2015

Energy

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“…In recent years, advancement in the design of such versatile and flexible systems has led to the development of alternative combustion modes including low temperature combustion (LTC) [8][9][10][11][12][13][14], homogeneous charge compression ignition (HCCI) [14][15][16][17][18][19][20][21][22], premixed charged compression ignition (PCCI) [23][24][25][26][27][28][29] and partially premixed combustion (PPC) [30][31][32][33] through the application of sophisticated fuel injection strategies. The results revealed the potential for simultaneous reduction of NOx and PM emissions through the application of such fuel injection and combustion modes.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

Herfatmanesh

Zhao

2012

International Journal of Engine Research

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The final, definitive version of this paper has been published in International Journal of Engine Research, Vol 15 Issue 1, September 2012, ppublished by SAGE Publishing, All rights reserved.In order to meet the ever more stringent emission standards, significant efforts have been devoted to the research and development of internal combustion engines. The requirements for more efficient and responsive diesel engines have led to the introduction and implementation of multiple injection strategies. However, the effects of such injection modes on the hydraulic systems, such as the high-pressure pipes and fuel injectors, must be thoroughly examined and compensated for since the combustion and the formation of pollutants in direct-injection engines are directly influenced by the spatial and temporal distribution of the injected fuel within the combustion chamber. This study investigated the hydraulic effects of two-stage fuel injection on diesel combustion and emissions. The fuel-injection system was characterised for all the tested strategies through the measurement of the fuel-injection rate and quantity. In particular, the interaction between the two injection events was identified. The effects of two-stage injection, dwell angle and the interactions between two consecutive injection events on the combustion process and the emissions were investigated in a high-speed direct-injection single-cylinder optical diesel engine using heat-release analysis and high-speed fuel spray and combustion visualisation techniques. The results indicated that the two-stage injection strategy has the potential for simultaneous reduction of nitrogen oxide, soot and unburned hydrocarbon emissions. The results suggested that an optimum fuel quantity in the first injection exists, 0???30%, with which simultaneous reduction of nitrogen oxide, soot and unburned hydrocarbon emissions can be achieved with the added benefits of improved engine performance, fuel economy and combustion noise. However, higher soot emissions were produced, mainly due to the interaction between the two consecutive fuel-injection events whereby the fuel sprays during the second injection were injected into burning regions, as well as reduced soot oxidation due to the continuation of the combustion into the expansion stroke

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“…The result for F4 strategy indicated that 5 o CA dwell timing was not sufficient for the injector to fully close prior to the onset of the second injection, thus almost replicating a single injection. This resulted in the total injected fuel quantity of approximately 27 mm 3 which was substantially higher than the desired quantity of 20 mm 3 . These considerable variations in the total fuel quantity injected were mainly attributed to the design limitations of the injector utilised as well as the adverse effect of pressure waves in the high pressure fuel line connecting the injector to the common rail, caused by the first injection.…”

Section: Effect Of Dwell Angle On Fuel Injection Quantitymentioning

confidence: 99%

In-cylinder studies of split injection in a single cylinder optical diesel engine

Herfatmanesh¹,

Zhao²,

Ganippa³

2011

Internal Combustion Engines: Improving Performance, Fuel Economy and Emission

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In order to meet the ever more stringent emission standards, significant efforts have been devoted to the research and development of cleaner IC engines. Diesel combustion and the formation of pollutants are directly influenced by spatial and temporal distribution of the fuel injected. This study investigates the effect of dwell timing on the in-cylinder combustion process and emissions through the application of 70%/30% split injection strategy in a single cylinder HSDI optical diesel engine. The fuel injection process was illuminated by a high repetition copper vapour laser and recorded synchronously by a high speed video camera. The combustion temperature and soot distribution during the combustion process were measured by a recently developed high speed two-colour system at the authors laboratory. The results indicated that this injection mode has the potential to improve fuel economy and engine performance while substantially reducing the combustion noise, provided that the injection timings are appropriately selected.

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PCCI Investigation Using Variable Intake Valve Closing in a Heavy Duty Diesel Engine

Cited by 73 publications

References 13 publications

The effects of early inlet valve closing and cylinder disablement on fuel economy and emissions of a direct injection diesel engine

The effects of early inlet valve closing and cylinder disablement on fuel economy and emissions of a direct injection diesel engine

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

In-cylinder studies of split injection in a single cylinder optical diesel engine

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