Classical knock control strategies are still widely used in production vehicles but exist in several variant forms whose performance with respect to one another, and to engine efficiency, ease of calibration and analytical tractability has not been rigorously evaluated. This paper examines the absolute and relative performance of these strategies subject to both transient and systematic disturbances using both time history simulation methods and analytical methods. The former illustrates the response to specific instances of the knock process, while the latter enables the statistical properties of the closed loop response to be computed and compared.
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