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Development of Intake Air Pressure Sensor-less Fuel Injection System for Small Motorcycles

Article of Honda R&D Technical Review Vol.23 No.2

Summary

An electronically controlled fuel injection system for small motorcycles was developed without an intake air pressure sensor to reduce costs. In a fuel injection system, the intake air pressure sensor performs the three functions of measuring the amount of intake air in minute throttle-opening range, measuring the atmospheric pressure, and distinguishing the engine stroke. This study replaced these functions with a new learning control system that applies O2 feedback control, and engine-stroke distinction control based on detection of crankshaft rotation speed fluctuation. This new learning control system defines the operational condition compensation coefficient Kbu, which covers operational conditions such as atmospheric pressure and conditional variations among completed engines, and uses this coefficient in the fuel injection quantity correction function. This enabled proper fuel injection quantity control without depending on intake air pressure sensor functions. In addition, storing Kbu in an Engine Control Unit (ECU) enabled proper air fuel ratio correction even when O2 feedback control is inactive, such as when the engine is cold immediately after starting or during transient operation. The engine-stroke distinction function enabled stroke distinction equal to that of the conventional system by changing the method from measurement of the difference in intake air pressure between engine strokes to detection of crankshaft rotation speed fluctuation between engine strokes. This technology realized a simplified system that maintains the same performance for exhaust emissions and fuel economy without an intake air pressure sensor.

Reference

(1) Utsugi, K., Akamatsu, S.: Technology for Secondary Emission Regulation in Japan of 50 cm3 Two-wheeled Vehicle, 2007 JSAE Annual Congress Proceedings, No. 29-07, p. 1-4 (2007)
(2) Shimada, N., Akamatsu, S., Ueda, M., Hayashi, A., Hirakata, Y.: Development of an ECU Integrated Throttle Body System Module for a Compact Fuel Injection System Used in Small Motorcycles and Scooters, Honda R&D Technical Review, Vol. 15, No. 1, p. 83-88
(3) Hayashi, T., Uraki, M., Makino, K., Okumura, T.: Development of Heaterless Oxygen Sensor for Small Motorcycles, 2006 JSAE Annual Congress Proceedings, No. 92-06, p. 21-24 (2006)
(4) Ikeda, K., Akamatsu, S., Tanaka, H., Murakami, Y., Oki, K., Kurosaka, H.: Development of 50 cm3 Four-stroke Four-valve Electronically Controlled Fuel-injection Engine for Two-wheeled Vehicle, 2004 JSAE Annual Congress Proceedings, No. 9-04, p. 15-18 (2004)
(5) Ueno, M., Ueda, M., Udono, T., Akamatsu, S., Torikai, M., Fukuda, M.: Development of Small Fuel Pump Module for Motorcycles, Honda R&D Technical Review, April, 2008, p. 89-94
(6) Horiike, S., Yamada, H., Ooyama, T., Kano, K., Abe, M., Iwata, Y.: Exhaust Emission Reduction System for "VFR800FI," HONDA R&D Technical Review, Vol. 10, p. 42-48
(7) Akamatsu, S., Ishida, S., Hamauzu, A.: A Research of Fuel Injection System for Low Emission Motorcycle, 2000 JSAE Annual Congress Proceedings, No. 103-00, p. 17-20 (2000)

Author (organization or company)

Katsuhiro UTSUGI(Motorcycle R&D Center)、Yuki TAKANO(Motorcycle R&D Center)、Kazuhiko SAKAGUCHI(Motorcycle R&D Center)、Kenta ONISHI(Motorcycle R&D Center)

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