Modeling and Simulation for Injector of GDI Engines


For direct-injection gasoline engines, reducing fuel consumption and particulate number in exhaust gas are needed. Reducing particulate number can be achieved by reducing the fuel adhesion to a cylinder and piston surface, and by injecting fuel multiple times which increases homogeneity degree of fuel-air mixture. For this purpose, reducing the minimum injection quantity is required. The authors developed the simulator which can analyze behavior of the valve and the injection characteristics, by taking a non-steady electromagnetic field analysis and the flow analysis in an equation of motion, and taking into account of the detailed of structure of the injector. They clarified that the valve bouncing during the opening action and residual magnetic force causes an increase of the minimum injection quantity.エンジンの低排気のために燃焼1回に対応する噴射を複数回に分割する必要があり,微少量の噴射量を制御できるインジェクタが必要である.本報では,噴射量を決める弁挙動を解析可能なシミュレータを開発し,微少噴射時に噴射量を不安定化させていた要因が開弁時の可動部のバウンドと,残留磁気の影響であることを解明した.


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  • Accession Number: 01673493
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jan 31 2018 3:22PM