Development of New 2.0 L I4 Gasoline Direct Injection Engine for Hybrid

Authors

T. Egawa, K. Ikeya, N. Ushio, Y. Kasajima, R. Yamaguhi, T. Kondo - Honda Motor Co. Ltd

Summary

A new hybrid system was developed for the new model Civic Hybrid. This development was pursued with the aim of providing low fuel consumption as a hybrid system, the latest in environmental performance, and enhanced driving marketability. As a new model 2.0 L gasoline engine making up part of the hybrid system, it was developed with the goals of expansion of the high thermal efficiency region, realization of up-to-date environmental performance, and a high level of quietness in the cabin. In addition to the Atkinson cycle and cooled exhaust gas recirculation (EGR) adopted from the previous model[1], the new engine has adopted a high fuel pressure in-cylinder direct fuel injection system. New designs for the combustion chamber and ports were implemented in conjunction with adoption of the in-cylinder direct fuel injection system. By realizing high-speed combustion, the engine realized a high compression ratio with the mechanical compression ratio of 13.9. The configuration of in-cylinder flow and fuel injection timing together with changes in the exhaust ports and the water jackets around the exhaust ports, realized stoichiometric combustion across a broad operating range as well as low fuel consumption and reduced emissions. The crankshaft and other engine components were also newly designed, not only suppressing the vibration from combustion, but also increasing the stiffness of the engine's component parts. Together with redesign of insulator specifications, this realized noise and vibration performance equal to or better than that of previous models.