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Tanaka, Takeshi
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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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A Study on Chipping Failure of Automotive Coatings

Kansai Paint Co., Ltd.-Takeshi Tanaka, Yutaka Mizutani, Hideo Sugai, Shigeru Nakamura, Yoshinori Hara
Published 2003-10-27 by SAE International in United States
By utilizing a high-speed photographic machine, we successfully observed the very moment that the coated films got destructed by so-called “chipping.” A high-speed steel ball was shot onto multiple coating films, when the impact energy was consumed for an extremely short time, i.e. about 1/1000 second and the energy has caused film destructions and/or detachment between film layers and/or vibration absorption. There was a good correlation in destruction of coated films between the high-speed steel ball impact test and the conventional gravel impact test, the latter of which is commonly employed for evaluation of chipping resistance. Moreover, for a prediction of chipping resistance by viscoelastic property of coated dry films, the observation of high-speed film deformation was very effective as a means of chipping analysis. The relaxation spectrum, being obtained from frequency-temperature variance in dynamic viscoelasticity measurement, was highly correlative to anti-chipping performance.
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