Study of Model-based Cooperative Control of EGR and VGT for a Low-temperature, Premixed Combustion Diesel Engine

2001 ◽  
Author(s):  
Takashi Shirawaka ◽  
Manabu Miura ◽  
Hiroyuki Itoyama ◽  
Eiji Aiyoshizawa ◽  
Shuji Kimura
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Cooperative Control ◽  
Premixed Combustion ◽  
Model Based

scholarly journals Optical Diagnostics of a Late Injection Low-Temperature Combustion in a Heavy Duty Diesel Engine

2007 ◽  
Author(s):  
Thierry Lachaux ◽  
Mark P. B. Musculus ◽  
Satbir Singh ◽  
Rolf D. Reitz
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Liquid Fuel ◽  
Premixed Combustion ◽  
Low Temperature Combustion ◽  
Heavy Duty ◽  
Cool Flame ◽  
Heavy Duty Diesel Engine ◽  
Temperature Combustion ◽  
Heavy Duty Diesel

A late injection, high exhaust-gas recirculation (EGR)-rate, low-temperature combustion strategy was investigated in a heavy-duty diesel engine using a suite of optical diagnostics: chemiluminescence for visualization of ignition and combustion, laser Mie scattering for liquid fuel imaging, planar laser-induced fluorescence (PLIF) for both OH and vapor-fuel imaging, and laser-induced incandescence (LII) for soot imaging. Fuel is injected at top dead center when the in-cylinder gases are hot and dense. Consequently, the maximum liquid fuel penetration is 27 mm, which is short enough to avoid wall impingement. The cool flame starts 4.5 crank angle degrees (CAD) after the start of injection (ASI), midway between the injector and bowl-rim, and likely helps fuel to vaporize. Within a few CAD, the cool-flame combustion reaches the bowl-rim. A large premixed combustion occurs near 9 CAD ASI, close to the bowl rim. Soot is visible shortly afterwards along the walls, typically between two adjacent jets at the head vortex location. OH PLIF indicates that premixed combustion first occurs within the jet and then spreads along the bowl rim in a thin layer, surrounding soot pockets at the start of the mixing-controlled combustion phase near 17 CAD ASI. During the mixing-controlled phase, soot is not fully oxidized and is still present near the bowl-rim late in the cycle. At the end of combustion near 27 CAD ASI, averaged PLIF images indicate two separate zones. OH PLIF appears near the bowl rim, while broadband PLIF persists late in the cycle near the injector. The most likely source of broadband PLIF is unburned fuel, which indicates that the near-injector region is a potential source of unburned hydrocarbons.

scholarly journals Optical Diagnostics of Late-Injection Low-Temperature Combustion in a Heavy-Duty Diesel Engine

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Thierry Lachaux ◽  
Mark P. B. Musculus ◽  
Satbir Singh ◽  
Rolf D. Reitz
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Liquid Fuel ◽  
Premixed Combustion ◽  
Low Temperature Combustion ◽  
Heavy Duty ◽  
Cool Flame ◽  
Heavy Duty Diesel Engine ◽  
Temperature Combustion ◽  
Heavy Duty Diesel

A late-injection, high exhaust-gas recirculation rate, low-temperature combustion strategy is investigated in a heavy-duty diesel engine using a suite of optical diagnostics: chemiluminescence for visualization of ignition and combustion, laser Mie scattering for liquid-fuel imaging, planar laser-induced fluorescence (PLIF) for both OH and vapor-fuel imagings, and laser-induced incandescence for soot imaging. Fuel is injected at top dead center when the in-cylinder gases are hot and dense. Consequently, the maximum liquid-fuel penetration is 27 mm, which is short enough to avoid wall impingement. The cool flame starts 4.5 crank angle degrees (CAD) after the start of injection (ASI), midway between the injector and bowl rim, and likely helps fuel to vaporize. Within a few CAD, the cool-flame combustion reaches the bowl rim. A large premixed combustion occurs near 9 CAD ASI, close to the bowl rim. Soot is visible shortly afterward, along the walls, typically between two adjacent jets. OH PLIF indicates that premixed combustion first occurs within the jet and then spreads along the bowl rim in a thin layer, surrounding soot pockets at the start of the mixing-controlled combustion phase near 17 CAD ASI. During the mixing-controlled phase, soot is not fully oxidized and is still present near the bowl rim late in the cycle. At the end of combustion near 27 CAD ASI, averaged PLIF images indicate two separate zones. OH PLIF appears near the bowl rim, while broadband PLIF persists late in the cycle near the injector. The most likely source of broadband PLIF is unburned fuel, which indicates that the near-injector region is a potential source of unburned hydrocarbons.

scholarly journals Study on Premixed Combustion in a Diesel Engine with Ultra-multihole Nozzle

2011 ◽  
Vol 2011 ◽  
pp. 1-16 ◽  
Author(s):  
Xuelong Miao ◽  
Guiyang Zhang ◽  
Yusheng Ju ◽  
Xianyong Wang ◽  
Jian-hai Hong ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Combustion Chamber ◽  
Large Diameter ◽  
Premixed Combustion ◽  
Flow Area ◽  
Idle Speed ◽  
Volume Production ◽  
Soot Emissions ◽  
Large Flow

This study proposed a new low-temperature premixed combustion mode to achieve the simultaneous reduction of NOxand soot emissions in a volume production diesel engine of CA6DF by reconstructing key systems. Some developments of this diesel engine are as follows. A straight port and large diameter combustion chamber of a low compression ratio was developed. Inlet ports of a high induction swirl ratio were developed. A cooled EGR was developed. Especially, an ultra-multihole (UMH) nozzle was developed. It has two layers of injection holes and a large flow area. Two sprays of the upper and under layers meet in the space of the combustion chamber. The results showed that the operation range of this diesel engine to achieve the better low-temperature premixed combustion is as follows. The speed can cover from the idle speed to the rated speed. The load can reach to 50% of the full load of the corresponding external characteristics speed. The NOxand soot emissions of this operation range are simultaneously largely reduced, even by 80%–90% at most test cases, while keeping the brake-specific fuel consumption (BSFC) from being significantly deteriorated.

scholarly journals Model-Based Control System for Air Path and Premixed Combustion of Diesel Engine

2018 ◽  
Vol 51 (31) ◽  
pp. 522-528
Author(s):  
Motoki Takahashi ◽  
Yudai Yamasaki ◽  
Shigehiko Kaneko ◽  
Jun Koizumi ◽  
Tomofumi Hayashi ◽  
...  
Keyword(s):  
Control System ◽  
Diesel Engine ◽  
Premixed Combustion ◽  
Model Based Control ◽  
Model Based
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