The knock threshold detection is the key of gasoline engine knock detection, and it is the key of the closed loop ignition control of gasoline engines.

The engine electronics system also controls the ion stream knock control that gauges the ideal ignition time of the individual cylinders, thus making full use of the engine's potential.

When worked in non-knock conditions, the most optimum spark angle is the adder of the initial spark angle, the basic ignition angle and the amendment spark angle.