Study of the impact of structural parameters on the dynamic response of an electronic fuel injector

Nao Hu, Jianguo Yang, Peilin Zhou, Ying Hu (Wuhan University of Technology, University of Strathclyde)

CHALLENGE - Nowadays, the HPCR system has gained significant attention and application as one of the most promising technologies for the control of internal combustion engines. The electronic fuel injector, one of the key components of HPCR systems, is of particular interest to researchers. Few studies were found which consider the impact of electronic fuel injector structural parameters on the dynamic response. In this paper, the impact of the structural parameters of an electronic fuel injector on injector dynamic response of the opening delay and closing delay are carefully investigated, and the opening delay and closing delay are the two objectives to be minimized.

SOLUTION - Firstly, a complete and detailed 1D electronic fuel injector model was built in AMESim and was validated by using injection quantity data and average steady-state mass flow rate obtained from an HIL test rig. Then, an optimization model was built in the modeFRONTIER software, where the 1D fuel injector model was included and a MOGA was applied for optimization. Besides the impacts of the structural parameters, the interactions of them were also studied. Scattering charts were used for selecting Pareto designs and the sensitivity of the important parameters and interactions on the delays were examined using RSM.

BENEFITS - The dynamic response of the selected optimal design achieves a huge reduction in 3 different rail pressures (80 MPa, 120 MPa and 160 MPa). More specifically, the opening delay reduced by 29.82%, 29.19% and 20.86%, and the closing delay reduces by 25.62%, 24.54% and 30.11% respectively.