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Research on Inertia Force Characteristics and Its Reduction in Extended Expansion Linkage Engine

Article of Honda R&D Technical Review Vol.24 No.1

Summary

An extended expansion engine (EXlink engine) using a multiple linkage system was studied as a system that realizes an extended expansion thermal cycle that raises the expansion ratio higher than the compression ratio in order to enhance the thermal efficiency of a general-purpose engine. An initial prototype EXlink engine increased the EPA exhaust emission control operating mode fuel economy by 13% compared to a conventional engine with the same output, but the maximum value of the inertia force produced by the multiple linkage system also increased by 93% compared to the conventional engine. This is because the maximum piston acceleration during the expansion stroke of the initial EXlink engine is 2.7 times that of the conventional engine.
A new linkage layout that controls the maximum piston acceleration was investigated to reduce the inertia force. By using a linkage configuration that allots a longer crank angle to the expansion and exhaust strokes, the piston acceleration is smoothed, enabling reduction of the inertia force. Compared to the initial linkage layout, the newly designed linkage layout reduced the calculated maximum piston acceleration by 42% and the calculated maximum inertia force value by 61%, and the expected vibration reduction effects were also confirmed in actual engine tests.

Reference

(1) Watanabe, S., Kono, S., Kurata, M., Koga, H.: Research on Extended Expansion General-Purpose Engine -Theoretical Analysis of Multiple Linkage System and Improvement of Thermal Efficiency-, Honda R&D Technical Review, Vol. 18, No. 1, p. 81-87
(2) Environmental Protection Agency: Title 40 CFR, Part 90, Subpart E, p. 219-247 (2000)
(3) Koga, H., Watanabe, S.: Research on Extended Expansion General-Purpose Engine (Part2) -Heat Release and Brake Performance-, Honda R&D Technical Review, April, 2007, p. 53-59
(4) 2002/44/EC, Official Journal of the European Communities: L177/13
(5) Naoe, G., Watanabe, S.: Research on Extended Expansion General-Purpose Engine -Characteristic of Vibration-, SAE Paper, 2008-32-0012 (2008)
(6) Basshuysen, R. V., et al; Modern Engine technology from A to Z, SAE International, p. 42 (2007)

Author (organization or company)

Gaku NAOE(Power Products R&D Center)、Kota TOKUBI(Power Products R&D Center)、Sei WATANABE(Power Products R&D Center)

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