Abstract

In order to realize extremely low emissions with diffusive diesel combustion, a study was made of methods for smoke suppression under the high-boost, high-EGR conditions that are effective in reducing NOx. Divided combustion that combines a reduction in the injected amount of main fuel with premixed combustion in which the amount of fuel injected early is increased was adopted in order to reduce the rich portion of the main diffusion combustion, which was the main generator of smoke in conventional combustion. The adoption of this divided combustion made it possible to raise the fuel injection pressure, which had previously been limited due to combustion noise, and a smoke reduction effect was confirmed together with the effect of divided combustion. In addition, a staggered spray layout was adopted in order to reduce dilution of the premixed injection. Combining these methods achieved diffusive diesel combustion with extremely low emissions, and reduced NOx by 40% while not causing increases in combustion noise or smoke, or reduction of thermal efficiency relative to conventional combustion.

References

1. (1) Hatano, J., Harada, T., Matsui, K., Kobayashi, H., Matsui, R.: Research on Expansion of Premixed Charge Compression Ignition (PCCI) Diesel Combustion Operation Range, Honda R&D Technical Review, Vol. 22, No. 2, p. 123-130
2. (2) Inaba, K., Zhang, Y., Sang, W., Del Lucia, B., Kobashi, Y., Shibata, G., Ogawa, H.: Improvement in Semi-premixed Diesel Combustion with Suppression from Interference of Primary Premixed Combustion to Secondary Fuel Spray, 2020 JSAE Congress (Autumn) Proceedings, No. 113-20, (2020) (in Japanese)
3. (3) Pan, W., Yokoyama, T., Bao, Z., Horibe, N., Kawanabe, H., Ishiyama, T.: Effects of Fuel Properties on Combined PCCI and Conventional Diesel Combustion, 2019 JSAE Annual Congress (Spring) Proceedings, No. 65-19, (2019)
4. (4) European Parliament: Amendments on the proposal for a regulation of the European Parliament and of the Council amending Regulation (EC) No 715/2007 on type approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, (2020)
5. (5) Komatsu, N., Yano, H., Kitayama, N., Yamaya, Y., Shuto, Y., Takahara, R.: Development of the New 1.6L Diesel Engine Compliant to RDE, 2018 JSAE Congress (Autumn) Proceedings, No. 120-18, (2018) (in Japanese)
6. (6) Koto, F., Mori, K., Kubo, K., Senda, J., Fujimoto, H.: Fundamental Study on Fuel Spray Characteristics of High Dispersion Nozzle (Staggered Layout Nozzle), Atomization, Vol. 13, No. 44, p. 1-7, (2004) (in Japanese)
7. (7) Torii, K.: A Time Domain Analysis Method to Estimate the Contributions of Engine Radiation Noise Components Using Multiple Regression Analysis, Transactions of Society of Automotive Engineers of Japan, Vol. 44, No. 4, p. 1051-1057, (2013) (in Japanese)
8. (8) Wang, H., Ra, Y., Jia, M., Reitz, R. D.: Development of a reduced n-dodecane-PAH mechanism and its application for n-dodecane soot predictions, Fuel, Vol. 136, p. 25-36, DOI 10.1016/j.fuel.2014.07.028, (2014)

Author (organization or company)

• Hirokazu ANDO
• Satoshi AOYAGI（Innovative Research Excellence Power Unit & Energy）
• Masayuki NAKATSU（Innovative Research Excellence Power Unit & Energy）
• Naoki OHYA（Innovative Research Excellence Power Unit & Energy）

Publication Information

Article of Honda R&D Technical Review Vol.33 No.2 (42 - 51)

PDF

Citation Information