PCCI Operation with Fuel Injection Timing Set Close to TDC

Kanda, Tomoyuki; Hakozaki, Takazo; Uchimoto, Tatsuya; Hatano, Jyunichi; Kitayama, Naoto; Sono, Hiroshi

doi:10.4271/2006-01-0920

Cited by 40 publications

(14 citation statements)

References 8 publications

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“…One of the technologies which has been receiving attention is Homogeneous Charge Compression Ignition (HCCI), which combines features of the spark ignition and compression ignition (CI) processes. The basic principle of HCCI is, either in gasoline [1,2,3,4] or diesel [5,6,7,8] engines, the air and fuel are premixed prior to ignition and then ignited by the compression from the piston motion. The ignition is provided in multiple points and therefore the charge gives a parallel energy release.…”

Section: Introductionmentioning

confidence: 99%

Extending the High Load Operating Limit of a Naturally-Aspirated Gasoline HCCI Combustion Engine

Yun¹,

Wermuth²,

Najt³

2010

SAE Int. J. Engines

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Homogenous Charge Compression Ignition (HCCI) combustion offers efficiency improvements compared to conventional gasoline engines. However, due to the nature of HCCI, traditional HCCI combustion can be realized only in a limited operating range. The HCCI operation at high load is limited by excessive combustion noise.In order to maximize the fuel economy benefits of HCCI its operating range needs to be extended to higher loads. In particular, one immediate benefit of an increased load range on the NEDC driving cycle is the avoidance of transitions between SI operation and HCCI operation.In this research a detailed investigation of the fundamental reasons for high combustion noise was performed. Sparkassisted HCCI combustion was found to be a key factor to reduce combustion noise at high load condition. Injection timing for charge cooling, spark timing for the onset of combustion through flame propagation, smaller NVO and higher EGR are the enablers to achieve the appropriate sparkassisted HCCI combustion at high load operation. The high load limit was successfully extended while maintaining good efficiency and complying with emissions regulations.The effect of double injection strategy was also investigated. It is found that even though slight improvement in the tradeoff between combustion noise and combustion stability can be achieved through double injection strategy, fuel consumption is deteriorated due to incomplete combustion.

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Section: Introductionmentioning

confidence: 99%

Extending the High Load Operating Limit of a Naturally-Aspirated Gasoline HCCI Combustion Engine

Yun¹,

Wermuth²,

Najt³

2010

SAE Int. J. Engines

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“…For NOx reduction, the commonly applied techniques are EGR, injection timing retard, and pilot-injection, of which EGR is commonly used as the primary in-cylinder NOx control technique [27][28][29][30][31][32]. Experimental investigations reveal that NOx decreases monotonically with EGR at different loads, injection pressures, and boost when plotted as a function of intake oxygen, suggesting that the dilution effect is the strongest (Figure 21).…”

Section: Resultsmentioning

confidence: 99%

Energy efficiency improvement strategies for a diesel engine in low-temperature combustion

Zheng

Asad

Reader

et al. 2009

Int. J. Energy Res.

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SUMMARYThe lowered combustion temperature in diesel engines is capable of reducing nitrogen oxides and soot simultaneously, which can be implemented by the heavy use of exhaust gas recirculation (EGR) or the homogeneous charge compression ignition (HCCI) type of combustion. However, the fuel efficiency of the low-temperature combustion (LTC) cycles is commonly compromised by the high levels of hydrocarbon and carbon monoxide emissions. More seriously, the scheduling of fuel delivery in HCCI engines has lesser leverage on the exact timing of auto-ignition that may even occur before the compression stroke is completed, which may cause excessive efficiency reduction and combustion roughness. New LTC control strategies have been explored experimentally to achieve ultralow emissions under independently controlled EGR, intake boost, exhaust backpressure, and multi-event fuel-injection events. Empirical comparisons have been made between the fuel efficiencies of LTC and conventional diesel cycles. Preliminary adaptive control strategies based on cylinder pressure characteristics have been implemented to enable and stabilize the LTC when heavy EGR is applied. The impact of heat-release phasing, duration, shaping, and splitting on the thermal efficiency has also been analyzed with engine cycle simulations. This research intends to identify the major parameters that affect diesel LTC engine thermal efficiency.

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“…LTC has been receiving great attention in the heavy-duty diesel engine industry. LTC includes a variety of innovative and different pre-mixed combustion mechanisms discovered by many researchers, such as PCCI (Kanda et al, 2005(Kanda et al, , 2006Zhang et al, 2009;Murata et al, 2010), HCCI (Stanglmaier and Roberts, 1999;Epping et al, 2002;zhao et al, 2003;Cracknell et al, 2008;Schleyer, 2006;Zhao, 2007), premixed compression ignition (PCI), modulated kinetics (MK), Unibus, and reactivity controlled compression ignition (RCCI) (Reitz, 2010), etc. A common feature of LTC is to enhance the premixing of fuel and air and to keep combustion temperature low in order to simultaneously avoid no x and soot formations (De Ojeda et al, 2007Musculus et al, 2011).…”

Section: Advanced Low-temperature Combustion Systemsmentioning

confidence: 99%

Improving the environmental performance of heavy-duty vehicles and engines: particular technologies

Xin

Pinzon

2014

Alternative Fuels and Advanced Vehicle Technologies for Improved Environmental Performance

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PCCI Operation with Fuel Injection Timing Set Close to TDC

Cited by 40 publications

References 8 publications

Extending the High Load Operating Limit of a Naturally-Aspirated Gasoline HCCI Combustion Engine

Extending the High Load Operating Limit of a Naturally-Aspirated Gasoline HCCI Combustion Engine

Energy efficiency improvement strategies for a diesel engine in low-temperature combustion

Improving the environmental performance of heavy-duty vehicles and engines: particular technologies

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