Patent ID: 8024107
Filing Date: 2011-09-20
Classification: F02D,F02P,Y02T

Abstract:
1. An ignition timing control system for an internal combustion engine, comprising: in-cylinder pressure-detecting means for detecting in-cylinder pressure of the engine; crank angle position-detecting means for detecting a crank angle position of the engine; maximum pressure angle-calculating means for calculating a crank angle position maximizing the in-cylinder pressure, as a maximum pressure angle, based on the detected in-cylinder pressure and the detected crank angle position; target angle-setting means for setting a target angle serving as a target to which the maximum pressure angle should be controlled; and ignition timing-calculating means for calculating ignition timing such that the calculated maximum pressure angle converges to the set target angle, with a control algorithm to which is applied a predetermined feedback control algorithm, while using a filtered value obtained by performing ε-filtering on a function which contains a difference between one of the maximum pressure angle and the target angle and the other thereof and is representative of a convergence property of the maximum pressure angle to the target angle.