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Development of New 2.4 L Direct-Injection Gasoline Engine

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

Summary

A new 2.4L i-VTEC 4-cylinder direct injection gasoline engine reconciling low CO2 emissions performance with high power has been developed as part of a next-generation Honda engine series. The new engine employs a direct injection system provided with a high-pressure multi-hole injector positioned between the inlet valves. The inlet head port, combustion chamber shape, injector spray, and fuel injection control were optimized in order to realize homogeneous air-fuel mixture formation and enhanced combustion. Together with the reduction of friction through the modification of the engine framework, these innovations made it possible to realize a 4% increase in maximum power, a 12% increase in maximum torque, and a 5% or more increase in unit fuel efficiency. The use of this engine in the 2013 model year Accord, together with the employment of a high-efficiency CVT and modification of the vehicle body, has made it possible to realize an 11% increase in the EPA fuel economy label value and an emissions level corresponding to the LEV II SULEV level in the California Air Resources Board regulations. In addition, the use of a new engine framework that was reduced in weight while realizing stiffness in the areas necessary for noise and vibration performance made it possible to balance weight savings with the realization of an equivalent or higher level of noise and vibration performance than the previous engine.

Reference

(1) Niizato, T., Hayashi, A.: Development of New 2.0L Lean-burn Engine, Honda R&D Technical Review, Vol. 12, No. 2, p. 45-54
(2) Seko, K., Taga, W., Torii, K., Nakamura, S., Akima, K., Sekiya, N.: Development of 1.8L i-VTEC Gasoline Engine for 2006 Model year Honda CIVIC, Honda R&D Technical Review, Vol. 18, No. 1, p. 8-15
(3) Kohda, Y., Suganami, T., Kobayashi, H., Ogawa, K.: Development of High-performance and Low-emission Direct Injection Gasoline Engine, Honda R&D Technical Review, Vol. 16, No. 1, p. 39-46
(4) Kawaguchi, R., Yamamoto, K., Kayaba, T., Kojima, S., Shinkai, T., Asame, K.: Development of 2.4 L i-VTEC Gasoline Engine for 2008 Model Year ACCORD, Honda R&D Technical Review, Vol. 20, No. 1, p. 27-34
(5) Sakamoto, A., Ozaki, M.: Interior Sound Enhancement of Vehicle Acceleration for New Model ACCORD - Transfer Path Analysis Using Principal Component Regression Method -, Honda R&D Technical Review, Vol. 19, No. 2, p. 67-71
(6) Noumura, K., Yoshida, J.: Method of Transfer Path Analysis for Interior Vehicle Sound Using Principal Component Regression Method, Honda R&D Technical Review, Vol. 18, No. 1, p. 136-141

Author (organization or company)

Yasuhiro MOTOHASHI(Automobile R&D Center)、Kenji KUBOTA(Automobile R&D Center)、Nobuyuki AKAISHI(Automobile R&D Center)、Kazuya ISHIKI(Automobile R&D Center)、Takashi IWAMOTO(Automobile R&D Center)、Masakazu KINOSHITA(Automobile R&D Center)

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