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Kawae, Tsutomu
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High Efficiency and Clean Diesel Combustion Concept using Double Premixed Combustion: D-SPIA

Toyota Industries Corporation-Hiroshi Kuzuyama, Masahiro Machida, Tsutomu Kawae, Takeshi Tanaka, Hideki Aoki, Yoshio Sugiyama, Tsutomu Umehara
Published 2012-04-16 by SAE International in United States
A new concept, Diesel Staggered Premixed Ignition with Accelerated oxidation (D-SPIA) was developed for lower exhaust emissions and carbon dioxide (CO₂) and this is based on divided fuel injection before top dead center (TDC). D-SPIA is a result of investigating various diesel combustion methods. Although the D-SPIA is a type of Premixed Charge Compression Ignition (PCCI), it has a distinct feature of double premixed combustion by optimum injection quantities and staggered timing, which can achieve an ideal heat release rate for low pollutant emissions and fuel consumption.Based on this concept, second injection timing and the proportion of the second fuel injection quantity play significant roles to reduce smoke, and hydrocarbon (HC) and carbon monoxide (CO) emissions. The second injection timing has a close relation to the premixed time of the second fuel injection and smoke level. The in-cylinder temperature at the second injection timing, which is related to the premixed time of the second fuel injection, is affected by the low-temperature heat release (LTHR) or the high-temperature heat release (HTHR) of the first fuel injection.…
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High Efficiency and Clean Diesel Combustion Concept Using Double Premixed Combustion (Second Report)~Influence of Environmental Variation and Fuel Cetane Quality on New Concept Combustion

Tsutomu Kawae, Hiroshi Kuzuyama, Takeshi Tanaka, Hideki Aoki, Yoshio Sugiyama, Tsutomu Umehara
  • Technical Paper
  • 2011-08-0656
Published 2011-10-12 by Society of Automotive Engineers of Japan in Japan
We investigated combustion robustness of new concept combustion, named D-SPIA, regarding intake air temperature, engine coolant temperature and fuel cetane quality. Through this testing we found out that heat release rate of D-SPIA could be maintained at desired phase by control of air-fuel ratio and/or injection timing against change of the environmental conditions. Besides, the combustion of D-SPIA was stable for using of lower cetane fuel.Finally, we tested a prototype engine installed D-SPIA combustion concept on transient engine test bench and could verify it had a potential to meet Euro6 regulation without any DeNOx after-treatment, showing no fuel penalty.
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High Efficiency and Clean Diesel Combustion Using Double Premixed Ignition (First Report)~Development of a New Combustion Concept and Potential of Emission Reduction

Hiroshi Kuzuyama, Masahiro Machida, Tsutomu Kawae, Tsutomu Umehara
  • Technical Paper
  • 2011-08-0655
Published 2011-10-12 by Society of Automotive Engineers of Japan in Japan
It is very important and urgent subject that internal combustion engines have better combustion potential on clean and high efficiency performance for energy-saving future. We developed a new concept combustion for lower exhaust emission included CO₂, named Diesel Staggered Premixed Ignition with Accelerated Oxidation (D-SPIA), that is based on divided fuel injections before TDC. Although our D-SPIA belongs to a kind of PCCI (Premixed Charge Compression Ignition), it has a distinct feature of double premixed combustion by optimum injection quantities and staggered timing, which can achieve an ideal heat release rate for low pollutant emission and fuel consumption stably.
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Low Emissions and High-Efficiency Diesel Combustion Using Highly Dispersed Sprays With Restricted In-Cylinder Swirl and Squish Flows (Second Report)~Application to Multi-Cylinder Engine for Validation of Engine Performances

Nippon Soken, Inc.-Masaaki Kono
Toyota Central R&D Labs., Inc.-Kazuhisa Inagaki
  • Technical Paper
  • 2010-08-0406
Published 2010-05-19 by Society of Automotive Engineers of Japan in Japan
The new diesel combustion concept in the first report was examined in more practical conditions using a multi-cylinder engine. A micro multi-hole injector was designed to create more diluted fuel-air mixture for NOx reduction, and near-zero swirl ports and lip-less cavity were to restrict in-cylinder flows. Such diluted mixture increases more unburned hydrocarbon, and results in worse fuel economy, generally. The restricted flows, however, improve it owing to reducing heat loss. As a result of complementary effects, our engine showed NOx were reduced to a half of Euro6 standards in the equivalent New European Driving Cycle, without deteriorating fuel economy.