吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (3): 806-813.doi: 10.13229/j.cnki.jdxbgxb201503018

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Electro-magnetic-thermal coupling of GDI injector

CHENG Qiang1, ZHANG Zhen-dong1, GUO Hui2, XIE Nai-liu1   

  1. 1.Institute of Automotive Engineering, University of Shanghai for Science and Technology, Shanghai 200093,China;
    2.College of Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620,China
  • Received:2013-08-19 Online:2015-05-01 Published:2015-05-01

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Abstract: Temperature rise greatly impacts the performance of the GDI injector and causes the ECU of an engine difficult to control fuel quantity accurately. According to the coupling relationship of electric, magnetic and thermal subsystems of the GDI injector, the physical model of the coupling process was established. The energy loss and transformation of the GDI injector in working process was explored. It is revealed that the loss of electromagnetic conversion is a key factor to cause the temperature rise of the GDI injector. The energy dissipation as heat source and the temperature field of the GDI injector was analyzed based on the finite element equation of the heat conduction and thermal radiation. The temperature field of the injector was simulated using ANSYS software; then the simulation results were verified by experiment. The effects of the temperature field distribution and the temperature rise variation on the performance of the GDI injector were analyzed. Results show that higher temperature rise is concentrated on the coil and core part, the response time of GDI injector gets longer as the temperature rises, and the injection quantity becomes lower. The value and the pulse width of the holding current have great impact on the GDI injector performance and temperature rise.

Key words: power machinery and engineering, gasoline direct injection(GDI) injector, electric-magnetic-thermal coupling, finite element simulation, dynamic response

CLC Number: 

  • TK413
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