NDLI: Quick Response Fuel Injector for Direct-Injection Gasoline Engines

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Quick Response Fuel Injector for Direct-Injection Gasoline Engines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Abe, Motoyuki Maekawa, Noriyuki Yasukawa, Yoshihito Ishikawa, Tohru Namaizawa, Yasuo Ehara, Hideharu
Copyright Year	2011
Abstract	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.
Sponsorship	Internal Combustion Engine Division
Starting Page	749
Ending Page	754
Page Count	6
File Format	PDF
ISBN	9780791844427
DOI	10.1115/ICEF2011-60032
Conference Proceedings	ASME 2011 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2011-10-02
Publisher Place	Morgantown, West Virginia, USA
Access Restriction	Subscribed
Subject Keyword	Actuators Fuel injectors Circuits Valves Fuel consumption Engines Stress Emissions Exhaust systems Ejectors Kinematics Drops Gasoline engines Delays Needle valves
Content Type	Text
Resource Type	Article

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