We developed a new injector for direct injection gasoline engines that reduce the exhaust emissions and help to reduce fuel consumption. The newly developed actuator in this injector has two features. One is a bounce-less valve closing mechanism, and the second is quick-response moving parts. The first feature, the bounce-less valve closing mechanism, can prevent ejecting a coarse droplet, which causes unburned gas emission. The new actuation mechanism realizes the bounce-less valve closing. We analyzed the valve motion and injection behavior. The second feature, the quick response actuator, achieves a smaller minimum injection quantity. This feature assists in reducing the fuel consumption under low load engine conditions. The closing delay time of the needle valve is the dominant factor of the minimum injection quantity because the injection quantity is controlled by the duration time of the valve opening. The new actuator movements can be operated with a shorter closing delay time. The closing delay time is caused by a magnetic delay and kinematic delay. A compact magnetic circuit of the actuator reduces the closing delay time by 26%. In addition, the kinematic delay was improved when the hydraulic resistance was reduced by 9%. As a result, the new injector realizes reduction of the minimum injection quantity by 25% compared to a conventional injector.
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ASME 2011 Internal Combustion Engine Division Fall Technical Conference
October 2–5, 2011
Morgantown, West Virginia, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4442-7
PROCEEDINGS PAPER
Quick Response Fuel Injector for Direct-Injection Gasoline Engines Available to Purchase
Motoyuki Abe,
Motoyuki Abe
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
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Noriyuki Maekawa,
Noriyuki Maekawa
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
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Yoshihito Yasukawa,
Yoshihito Yasukawa
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
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Tohru Ishikawa,
Tohru Ishikawa
Hitachi Automotive Systems, Ltd., Hitachinaka, Ibaraki, Japan
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Yasuo Namaizawa,
Yasuo Namaizawa
Hitachi Automotive Systems, Ltd., Hitachinaka, Ibaraki, Japan
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Hideharu Ehara
Hideharu Ehara
Hitachi Automotive Systems, Ltd., Hitachinaka, Ibaraki, Japan
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Motoyuki Abe
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
Noriyuki Maekawa
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
Yoshihito Yasukawa
Hitachi, Ltd., Hitachinaka, Ibaraki, Japan
Tohru Ishikawa
Hitachi Automotive Systems, Ltd., Hitachinaka, Ibaraki, Japan
Yasuo Namaizawa
Hitachi Automotive Systems, Ltd., Hitachinaka, Ibaraki, Japan
Hideharu Ehara
Hitachi Automotive Systems, Ltd., Hitachinaka, Ibaraki, Japan
Paper No:
ICEF2011-60032, pp. 749-754; 6 pages
Published Online:
February 3, 2012
Citation
Abe, M, Maekawa, N, Yasukawa, Y, Ishikawa, T, Namaizawa, Y, & Ehara, H. "Quick Response Fuel Injector for Direct-Injection Gasoline Engines." Proceedings of the ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASME 2011 Internal Combustion Engine Division Fall Technical Conference. Morgantown, West Virginia, USA. October 2–5, 2011. pp. 749-754. ASME. https://doi.org/10.1115/ICEF2011-60032
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