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Development of High-pressure Fuel System for Direct Injection Gasoline Engine

Article of Honda R&D Technical Review Vol.16 No.1

Summary

A center injection system in which a high-pressure fuel injector is located in the center of the combustion chamber has been employed in a newly developed direct injection gasoline engine. The high-pressure fuel injector is highly responsive, with a minimum injection timing of 0.7 msec, and injects an ultra-atomization spray with an average droplet diameter of less than 12 μm. To ensure durability and reliability in this original center injection system, the high-pressure fuel injector mounting employs a layout in which the unit is secured by arms. The design of the high-pressure fuel supply lines was optimized using simulations, and the reduction of stress and the adoption of a structure to damp fuel pulsation have resulted in the achievement of high reliability. A simple plunger and spill solenoid system has been employed in the high-pressure fuel pump, enabling the required driving force to be reduced, the component to be reduced in size, and the achievement of high-accuracy fuel pressure control.

Reference

(1) Matsushita, S., Nakanishi, K., Gohno, T., Sawada, D.: Mixture Formation Process and Combustion Process of Direct Injection S. I. Engine, JSAE Annual Congress Proceedings, No. 965 p. 102 (1996)
(2) Kinoshita, M., Saito, A., Matsushita, S., Shibata, H., Niwa, Y.: Study of Nozzle Deposit Formation Mechanism for Direct Injection Gasoline Engines, JSAE Annual Congress Proceedings, No. 976 p. 23-24 (1997)
(3) Ashida, T.: Effects of Fuel on Deposits in Gasoline Engines, JSAE Annual Congress Proceedings, No. 08-00, p. 25-26 (2000)

Author (organization or company)

Hiroyuki GOTO(Tochigi R&D Center)、Kenji HIROSE(Tochigi R&D Center)、Masayoshi SAITOH(Tochigi R&D Center)、Seiji MATSUMOTO(Tochigi R&D Center)、Satoshi IITAKA(Tochigi R&D Center)、Kazuhiro TAKASHIBA(Tochigi R&D Center)

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