Adaptive Combustion Control to Improve Diesel HCCI Cycle Fuel Efficiency

Zheng, Ming; Reader, Graham T.; Tan, Yuyu; Wang, Meiping

doi:10.1115/icef2007-1630

Cited by 8 publications

(4 citation statements)

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“…This suggested that the mixing between the diesel and the premixed ethanol was still not complete; otherwise the combustion phasing should be insignificantly affected by the diesel SOI timing if HCCI combustion had been realized at the time. 25 With excessively advanced diesel SOI timing, and enhanced mixing, dual-fuel combustion changed to quasi-HCCI combustion, as is therefore indicated by the shortened CD.…”

Section: Resultsmentioning

confidence: 99%

Ethanol–diesel premixed charge compression ignition to achieve clean combustion under high loads

Zheng

2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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Ethanol–diesel dual-fuel premixed charge compression ignition combustion was investigated in a diesel engine with a compression ratio of 18.2:1, where the ethanol was delivered via port fuel injection and the diesel was injected through common-rail high-pressure direct injection. The paper presents the test results highlighting the effect of the fuel ratio, the exhaust gas recirculation and the diesel start of injection on the dual-fuel combustion and the emissions from medium to high loads. The results showed that the usage of ethanol can effectively suppress the nitrogen oxide emissions and the soot emissions with less aggressive exhaust gas recirculation levels than with diesel-only low-temperature combustion. The combustion phasing was responsive to the in-cylinder diesel injection over a wide range of timings. The dual-fuel operation load was increased to an indicated mean effective pressure of 18 bar (nearly the full load of the test engine), with a boost intake pressure of up to 2.5 bar and the ethanol ratio increased to about 0.9. The high-load premixed charge compression ignition was realized through adequate control of the exhaust gas recirculation level, the intake boost pressure, the injection pressure, the injection scheduling and the fuel ratio. The challenges and the approaches to suppress the nitrogen oxide emissions and the soot emissions simultaneously at a high load were demonstrated. The nitrogen oxide level was constrained to within 0.2 g/kW h and the soot level was simultaneously below 0.01g/kW h at a stable operation load with an indicated mean effective pressure of 16 bar and a moderate pressure rise rate.

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Section: Resultsmentioning

confidence: 99%

Ethanol–diesel premixed charge compression ignition to achieve clean combustion under high loads

Zheng

2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Ultra-low NOx was reached at about 14% intake oxygen concentrations, while the soot emissions remained less than 0.01 g/kWh 18 19 16 18…”

Section: Diesel-ethanol Ltcmentioning

confidence: 98%

“…For homogeneous charge compression ignition (HCCI) combustion enabled by early multiple injections, the start of combustion is mainly determined by the in-cylinder compression temperature and the chemical reactivity of the fuel and air mixture [14]. The fuel injection timing has a minor effect on the combustion phasing [15][16][17][18], while the higher engine load is another challenge for HCCI type of combustion.…”

Section: Introductionmentioning

confidence: 99%

An Enabling Study of Low Temperature Combustion With Ethanol in a Diesel Engine

Gao¹,

Divekar²,

Asad³

et al. 2013

Journal of Energy Resources Technology

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An Enabling Study of Low Temperature Combustion With Etbanoi in a Diesei EnginePrevious research indicates that the low temperature combustion (LTC) is capable of producing ultra-low nitrogen oxides (NOx) and soot emissions. The LTC in diesel engines can be enabled by the use of heavy exhaust gas recirculation (FGR) at moderate engine loads. However, when operating at higher engine loads, elevated demands of both intake boost and EGR levels to ensure ultra-low emissions make engine controllability a challenging task. In this work, a multifuel combustion strategy is implemented to improve the emission performance and engine controllability at higher engine loads. The port fueling of ethanol is ignited by the direct injection of^ diesel fuel. The ethanol impacts on the engine emissions, ignition delay, heat-release shaping, and cylinder-charge cooling have been empirically analyzed with the sweeps of different ethanol-to-diesel ratios. Zerodimensional phenomenological engine cycle simulations have been conducted to supplement the empirical work. The multifuel combustion of ethanol and diesel produces lower emissions of NOx and soot while maintaining the engine efficiency. The experimental setup and study cases are described, and the potential for the application of an ethanolto-diesel multifuel system at higher loads has been proposed and discussed.

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“…The combustion phasing control of early-multi-injection HCCI is a challenge for extending engine load levels [10,11]. On the other hand, the engine operation region of LTC achieved by single-shot injection along with the heavy use of EGR is constrained into narrow corridors or isolated islands of intake boost, EGR ratio, and engine loads [12,13].…”

Section: Introductionmentioning

confidence: 99%

Empirical Study of Simultaneously Low NOx and Soot Combustion With Diesel and Ethanol Fuels in Diesel Engine

Han

Xie

Tjong

et al. 2012

Journal of Engineering for Gas Turbines and Power

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Diesel low temperature combustion (LTC) is capable of producing diesel-like efficiency while emitting ultra-low nitrogen oxides (NOJ and soot emissions. Previous work indicates that well-controlled single-shot injection with exhaust gas recirculation (EGR) is an operative way of achieving diesel LTC from low to mid engine loads. However, as the engine load is increased, demanding intake boost and injection pressure are necessary to suppress high soot emissions during the transition to LTC. The use of volatile fuels such as ethanol is deemed capable of promoting the cylinder charge homogeneity, which helps to overcome the high soot challenge and, thus, potentially expand the engine LTC load range. In this work, LTC investigations were carried out on a high compression ratio (18.2;1) engine. Engine tests were first conducted with diesel and LTC operation at 8 bar indicated mean effective pressure (IMEP) was enabled by sophisticated control of the injection pressure, injection timing, intake boost, and EGR application. The engine peiformance was characterized as the baseline, and the challenges were identified. Further tests were aimed to improve the engine performance against these baseline results. Experiments were, hence, conducted on the same engine with secondary ethanol port fuelling (PE). Single-shot diesel direct injection (Dl) was applied close to top dead center (TDC) to ignite the ethanol and control the combustion phasing. The control sensitivity was studied through injection timing sweeps and EGR sweeps. Additional tests were performed to investigate the ethanol-to-diesel ratio effects on the mixture reactivity and the engine emissions. Engine load was also raised to 16.4 bar IMEP while keeping the simultaneously low NOj^ and soot emissions. Significant improvement of engine control and emissions was achieved by the DI-\-PF strategy.Moreover, ethanol is a renewable biofuel that is mainly produced from sugar and starch products. The use of ethanol can Journal of Engineering for Gas Turbines and Power

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Adaptive Combustion Control to Improve Diesel HCCI Cycle Fuel Efficiency

Cited by 8 publications

References 0 publications

Ethanol–diesel premixed charge compression ignition to achieve clean combustion under high loads

Ethanol–diesel premixed charge compression ignition to achieve clean combustion under high loads

An Enabling Study of Low Temperature Combustion With Ethanol in a Diesel Engine

Empirical Study of Simultaneously Low NOx and Soot Combustion With Diesel and Ethanol Fuels in Diesel Engine

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