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Analysis of Mechanism of Early Clogging of Suction Filter with Use of Ethanol Blended Fuel and Development of Long-life Filter

Article of Honda R&D Technical Review Vol.24 No.2


The authors have developed a long-life suction filter to cope with fuels containing ethanol. In the fuel system of small motorcycles, the suction filter protects parts such as the fuel pump, injector, pressure regulator, etc. from dusts in the fuel. It is known that in conventional suction filters, when compared with neat gasoline, the filter life is shorter by 50% if it is used with a fuel containing 25% ethanol. In addition to the study on the correlation between the ethanol concentration and the dust dispersion in the fuel, our study has clarified how the early clogging occurs, i.e., the dusts dispersed in the ethanol-containing fuel coagulate again when passing though the multi-layered suction filter, and trapped predominantly by the lower-most layer having the finest mesh-size. Considering that the cause of dust coagulation is the flow field that occurs in the filter layer, the coagulation acceleration layer that accelerates coagulation by creating flow fields, placed in the upper layer, has been added in the newly developed long life filter. The new filter permits trapping of dusts in the coarse upper layer of the multi-layered filter, preventing concentration of trapping in the fine, lower-most layer, thus doubling the filter life when compared to the conventional filter.


(1) Naoyuki Ishida, Ko Higashitani, Yasuo Mori: “Publication of Society of Particle Technology of Japan: Dispersion of particles in liquid phase·coagulation and separation operations, Chapter 1” Nikkan Kogyo Shinbun p.10-43(2010)
(2) Shinto, H, M. Miyahara and K. Higashitani: “Interaction forces between colloidal particles in alcohol-water mixtures evaluated by simple model simulations”, Langmuir, 16, 3361-3371 (2000)
(3) Higashitani, K. and Y. Matsuno: “Rapid Brownian coagulation of colloidal dispersions”, J. Chem. Eng. Japan, Vol. 12, pp.460-465 (1979)
(4) Higashitani, K, S. Miyafusa, T. Matsuda, and Y. Matsuno: “Axial change of total particle concentration in Poiseuille flow”, J. Colloid Interface Sci., Vol. 77, pp. 21-28 (1980)

Author (organization or company)

Shingo ARAI(Motorcycle R&D Center)、Atsushi ITO(Motorcycle R&D Center)、Tsubasa ISHII(Motorcycle R&D Center)、Hideaki ANDO(Motorcycle R&D Center)、Keita KINOSHITA(Motorcycle R&D Center)、Fujio UMEBAYASHI(Motorcycle R&D Center)

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