Statistical Engine Knock Control

A new statistical concept of the knock control of spark ignition automotive engine is proposed. The control aim is associated with the statistical hypothesis test which compares the threshold value to the average value of the maximal amplitude of the knock sensor signal at a certain frequency. Achievement of the control aim implies the desired separation between the average value of the maximal amplitude and the target value and hence the desired probability of the knock occurrence. This new control concept allows connection of the control algorithm parameters with the probability of the knock occurrence and customer related data. The regulation error is defined as a difference between the actual and the desired values of the statistic. A control algorithm which is used for minimization of the regulation error realizes a simple countup- count-down logic.