A study on the design and application of optimized solenoid for diesel unit injector |
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Authors: | Jae-Won Hwang Han-Joo Kal Jae-Keun Park A A Martychenko Jae-Ou Chae |
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Affiliation: | (1) Department of mechanical Engineering, INHA University, #253 Younghyun-Dong Nara-Gu, 402-751 Inchon, Korea |
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Abstract: | With the Environmental Protection Agency (EPA) regulating the amount of NOx, Particulate, HC and CO at all driving conditions,
emission standards for diesel engines are becoming more stringent than ever. To meet future emission regulations, researchers
have proposed two solutions based on injection control, the common-rail type injection system, and the unit injection system.
Most researchers agree that the electronically controlled unit injector, which realizes high injection pressure and precise
control of SOI (Start Of Injection) and injection quantity, has an advantage in meeting future emission regulations. In order
to control the start and end of injection, each unit injector contains a time-controlled high speed solenoid valve. Thus,
the fuel injection quantity is determined by the time interval between closing and opening of the solenoid valve. This study
introduces a method for the design of the solenoid which is installed in the unit injector. It is shown that there are certain
significant parameters to be optimized to improve solenoid performance: inductance, stroke, input voltage, coil resistance,
load and switching time. |
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Keywords: | Unit Injector Rising Time Waiting Time Optimal Inductance |
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