Dynamic modeling of piezoelectric injector-enabled rate shaping

Piezoelectric fuel injectors provide a means to lower emissions, noise and fuel consumption in advanced IC engines by enabling complex injection rate profiles - referred to a “rate shaping”. However, consideration of the flow rate non-linearity, piezostack hysteresis, and hydro-mechanical dynamics is required to achieve precise control of rate shaping. The goal of the effort described here is to develop, and experimentally validate a model of a piezoelectric fuel injector during rate-shaping operating conditions.