Robust control and coordination of engine systems

In this paper, a novel two-step design procedure is introduced for robust control and coordination of engine idle speed and emission systems. The procedure starts with the optimal broad-band decoupling of engine subsystems via feedforward compensation. The problem can be reduced to a standard H/sup /spl infin// optimization problem and solved by using Nevanlinna-Pick interpolation. A robust decentralized control in H/sup /spl infin// is then employed to achieve robust stabilization and disturbance attenuation of the compensated systems. A computer search algorithm for optimal decentralized PI controllers is developed. Benefits of the two-step design include modularization of control tasks, enhancement of robustness and performance, reduction of calibration time and complexity.

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