Affiliations: [a] Institute of Automotive Engineering, University of
Shanghai for Science and Technology, Shanghai, China | [b] College of Automotive Engineering, Shanghai University
of Engineering Science, Shanghai, China
Correspondence:
[*]
Corresponding author: Zhen-Dong Zhang, Institute of Automotive
Engineering, University of Shanghai for Science and Technology, Shanghai
200093, China. Tel.: +86 021 5527 5287; Fax: +86 021 5527 0456; E-mail:
[email protected]
Abstract: The GDI (Gasoline Direct Injection) injector is influenced by
electro-magnetic-thermal coupling, and has strong nonlinearity and coupling.
Temperature rise greatly impacts the performance of the GDI injector and makes
the ECU of the engine difficult to control fuel injection quantity accurately.
According to the coupling relationship of electric, magnetic and thermal
subsystems of the GDI injector, the physical model of coupled process was
established. The energy loss and transformation of the GDI injector in work
process was explored, and revealed that the energy loss in electromagnetic
conversion was a key factor to cause the GDI injector temperature rise. The
energy loss coming from electromagnetic conversion was regarded as heat source.
The temperature field of the GDI injector contains heat conduction and thermal
radiation was analyzed based on the finite element theories. By using the ANSYS
software to simulate multiple physical fields of the GDI injector, and then
experiment method to verify the simulation results, distribution
characteristics of temperature field and variations of temperature rise effect
on the performance of the GDI injector was analyzed. The results show that,
higher temperature rise is concentrated on coil and core part and with the
higher temperature rise the response time of the GDI injector get longer, the
fuel injection quantity becomes less. The value and pulse width of the holding
current I have great impact on the GDI injector performance and temperature rise.
Keywords: GDI injector, temperature rise, electric-magnetic-thermal coupling, finite element simulation, dynamic response
