RAPID ESTIMATION OF PIEZOELECTRIC FUEL INJECTION EVENTS

摘要

Piezoelectric fuel injectors provide a means to reduce fuel consumption, noise and emissions in modern IC engines. Disclosed herein are methods and apparatus for within-an-engine cycle estimation of injected fuel, especially for a "rate shaped" profile. A reduced order model is introduced by simplifying a physically-based, experimentally- validated simulation model. The estimation algorithm is derived from the model by closing a loop of one or more measurable quantities in the system. The resulting estimator runs at a sufficiently short loop time and is able to make an on-line prediction of fuel injection rate, and is also validated to show the improvement on the prediction.