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Development of Integrated Fuel Injection System for Small Sized Motorcycles

Article of Honda R&D Technical Review Vol.17 No.2


Demands for reducing exhaust emission and enhancing fuel economy have been increasing in accordance with growing concerns regarding global environmental issues. An electronically controlled fuel injection system which precisely controls the air-fuel ratio has been adopted to effectively meet the demands. Technologies for miniaturizing and achieving a high-efficiency system have been established for fuel injectors, the fuel pump and ECU (Electrical Control Unit). For the fuel injector, a spray form and magnetic circuit was optimized through computer simulation. As the result, a fuel injector with good installation ability for engine displacements ranging from 50 cm3 to 900 cm3 was realized. For the fuel pump, the maximized motor efficiency along with an optimized pump rotor shape reduced current consumption by 25%. For the ECU, the development of a circuit-integrated custom IC and the standardization of a housing achieved a compact, light, inexpensive design.


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(2) Ikeda, K., Akamatsu, S., Tanaka, H., Murakami, Y., Oki, T., Kurosaka, H.: Development of 50 cm3 Four-stroke Four-valve Electronically Controlled Fuel-injection Engine for Twowheeled Vehicles, JSAE Paper 20045019 (2004)
(3) Kato, Y., Koyanagi, K., Kikuta, H., Okubo, T.: The Downsized Injector, JSAE Paper 20035138 (2003)
(4) Ujiie, T., Saito, H., Ueda, M., Akamastsu, S., Hayashi, A., Nakano, Y.: Development of Fuel Injector and Fuel Pump for a Fuel Injection System to Use in Small Motorcycles,
SAE Paper 2005-01-0047 (2005)
(5) Kubo, H., Yamada, H.: Parts for Gasoline Engine Air Fuel Ratio Control, ENGINE TECHNOLOGY, Vol. 4, No. 3, p. 104-109 (2002)
(6) Araki, K., Akiyama, H., Ouchi, K., Akamatsu, S., Nakano, Y.: Development of Electronic Fuel -injection Control Unit of Small Motorcycle, JSAE Paper 20055179 (2005)

Author (organization or company)

Shunji AKAMATSU(Asaka R&D Center)、Minoru UEDA(Asaka R&D Center)、Akira HAYASHI(Asaka R&D Center)、Katsuhiro OUCHI(Asaka R&D Center)

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