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Development of New 2.0 L Gasoline Engine for Accord Hybrid

Article of Honda R&D Technical Review Vol.25 No.2

Summary

We developed a new 2.0 L gasoline engine for an Accord hybrid. This engine achieved remarkable fuel efficiency, and complied with the SULEV20 regulation for the first time in the world for an Accord plug-in hybrid in North America. The mechanical compression ratio was set to 13 and improvement in thermal efficiency was aimed at by adopting the Atkinson cycle and cooled EGR. Applying a VTEC system to the intake valve-train, we set up the output cam and the fuel economy cam. The output cam has narrow duration and is used as needed at the time of starting and high-output. The fuel economy cam has wide duration and is used during normal driving. By controlling air-intake closed-valve timing in combination with VTC, the fuel economy cam can acquire the maximum effect of the Atkinson cycle. The minimum specific fuel consumption attained was 214 g/kWh, equaling a 10% improvement in fuel consumption compared to the mass-production 2.0 L engine.
Moreover, we also aggressively tackled engine weight saving. A lightweight forged crankshaft was adopted, and the piston design was optimized, and lightweight press-type rocker arms were applied to the exhaust valve-train. As a result, the newly developed DOHC engine attained 4.7% weight savings over the mass-production 2.0 L SOHC engine.

Reference

(1) Yonekawa, A., Ueno, M., Watanabe, O., Ishikawa, N.: Development of New Gasoline Engine for ACCORD Plug-in Hybrid, SAE Technical Paper 2013-01-1738 (2013)
(2) Higuchi, N., Sunaga, Y., Tanaka, M., Shimada, H.: Development of a New Two-Motor Plug-In Hybrid System, SAE Technical Paper 2013-01-1476 (2013)
(3) Okui, S., Kishi, T., Ishikawa, N., Hanada, K.: Development of 3-stage i-VTEC VCM Engine for CIVIC Hybrid, Honda R&D Technical Review, Vol. 18, No. 2, p. 44-51
(4) Kawamoto, N., Naiki, K., Kawai, T., Shikida, T., Tomatsuri, M.: Development of New 1.8-Liter Engine for Hybrid Vehicles, SAE Technical Paper 2009-01-1061 (2009)

Author (organization or company)

Akiyuki YONEKAWA(Automobile R&D Center)、Osamu WATANABE(Automobile R&D Center)、Noritaka SEKIYA(Automobile R&D Center)、Naohiro ISHIKAWA(Automobile R&D Center)

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