Indirect passivation design for a diesel engine model

Unstable (nonminimum) zero dynamics are an obstacle to direct feedback passivation. In multivariable (MIMO) systems, the zero dynamics of a particular input-output pair may be stabilizable by another input, making indirect single-input single-output (SISO) passivation feasible. This indirect passivation methodology is illustrated by a design for a simplified model of turbocharged diesel engine and tested by simulation on a higher-order model.