Reference and extended command governors for control of turbocharged gasoline engines based on linear models

Abstract

In this paper, reference and extended command governors are developed for enforcing constraints in the air path of turbo-charged gasoline engines. These governors are add-on control schemes which protect the engine from violating pointwise-in-time state and control constraints, including compressor surge and actuator limits. Several design choices based on linear engine models at different operating points are compared in terms of response speed, sets of recoverable initial conditions, tolerance of disturbances, and computational complexity. The final design is implemented on the nonlinear engine model. Further, an approach to handle intake manifold pressure overshoot constraints, and a novel form of the extended command governor based on Laguerre's sequences are presented.