Direct Fuel Injector Power Drive System Optimization

The objective of this study is to optimize the injector power drive system for improved fuel injection quantity and timing control. The power drive system was optimized for improved injection repeatability under different operating conditions such as fuel supply pressures. A coupled simulation of injector electromagnetic, pintle (needle) rigid body motion and computational fluid dynamics (CFD) model was employed to generate the optimal values of the 1^st stage current, the 1^st stage on-time and the 2^nd stage current. The simulation results were validated against the experimental data measured with a photo detector measurement system.