Sensitivity analysis of the dynamic response of an electronic fuel injector regarding fuel properties and operating conditions
CHALLENGE - Electronic fuel injectors play an indispensable role in High Pressure Common Rail (HPCR) fuel injection systems and interest numerous researchers to improve their performance. This paper investigates the sensitivity of three fuel properties (the fuel density, bulk modulus and absolute viscosity) to the valve opening/closing delay and the valve opening/closing time.
SOLUTION - An electronic fuel injector model was built in AMEsim software and completely validated by the experimental data. Then, this validated injector model was included in a DOE model built in modeFRONTIER, where a Uniform Latin Hypercube method was adopted. The sensitivity of the three fuel properties to the dynamic response were compared at both the low rail pressure and at high rail pressure. They were examined and obtained by using a first order SS-ANOVA algorithm
BENEFITS - The bulk modulus was found to play a dominant role in influencing the valve opening/closing delay at the low rail pressure. However, at the high rail pressure, the effects of the viscosity are prominent, while the effects of the bulk modulus and the density are negligible.