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Research on Combustion Switching Control for Direct Injection Gasoline Engine

Article of Honda R&D Technical Review Vol.16 No.2

Summary

Honda has developed its first-ever i-VTEC I direct injection gasoline engine employing a center injection system in which a high-pressure fuel injector is located at the center of the combustion chamber. Direct injection enables stratified charge combustion to be employed, and the new center injection engine demonstrates significantly improved fuel economy and emissions performance in the range of vehicle operation in which this type of combustion is used. The authors studied methods of switching between direct-injection stratified charge (DISC) and pre-mixed combustion in order to utilize DISC. The two forms of combustion employed in the new direct-injection engine differ in terms of combustion limits in relation to recirculated exhaust gas and air-fuel ratio. This causes the torque difference which is a specific issue in direct injection gasoline engines. The authors resolved this issue through the application of two technologies. Fuel injection during the intake stroke and the compression stroke has improved the combustion limit. When combustion is stable, the appropriate quantity of fuel to be supplied is determined from the required torque.

Reference

(1) Kume, et al.: Combustion Control Technologies for Direct Injection SI Engines, Proceedings of JSAE, No. 961, 9631948
(2) Kuma, T., Iwamoto, Y., Iida, K., Murakami, M., Akishino, K., Ando, H.: Combustion Control Technologies for Direct Injection SI Engine, SAE Paper 960600
(3) Noda, T., Iriya Y., Naito, K., Mitsumoto, H., Iiyama, A.: Air-fuel Mixture and Power Performance of Directinjection Gasoline Engines, Proceedings of JSAE, No. 976, 9740307 (1997)
(4) Harada, J., Tomita, T., Mizuno, H., Mashiki, Z., Ito, Y.: Development of Direct Injection Gasoline Engine, SAE Paper 970540
(5) Koda, Y., Suganami, T., Kobayashi, H., Ogawa, K.: Development of High-performance and Low-emission Direct Injection Gasoline Engine, Honda Technical Review, Vol. 16, No. 1, p. 39-46
(6) Masuki, et al.: Development of D-4 Engine, Toyota Technical Review Vol. 47, No. 2, p. 33-37, Nov. (1997)
(7) Goto, H., Hirose, K., Saitoh, M., Matsumoto, S., Iitaka, S., Takashiba, K.: Development of High-pressure Fuel System for Direct Injection Gasoline Engine, Honda Technical Review, Vol. 16, No. 1, p. 47-54

Author (organization or company)

Ken OGAWA(Tochigi R&D Center)、Isao KOMORIYA(Tochigi R&D Center)、Hiroshi TAGAMI(Tochigi R&D Center)、Yutaka KOHDA(Tochigi R&D Center)、Masahiro TAKEUCHI(Tochigi R&D Center)、Yuji FUJIKI(Tochigi R&D Center)

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