| 摘要 |
PURPOSE:To prevent ignition timing from entering a knocking range even at the time of a timing advance by MBT (minimum advance for best torque) control as wel as to avoid getting any knocking by decreasing a compensating portion by a learning value gradually to the timing delay side when an internal combustion engine is shifted to the knocking range. CONSTITUTION:A means 1 detects cylinder internal pressure in an internal combustion engine, and means 2 detects a peak crank angle position where this cylinder internal pressure comes to the maximum, while a means 3 operats a compensation value of ignition timing on the basis of a difference between the peak crank angle position and a target position. In addition, a means 4 detects a knocking state on the basis of the cylinder internal pressure, while a means 5 operates the compensation value of the ignition timing according to the knocking state. And, a device 6 stores the compensation value as a learning value, while a means 7 controls the ignition timing according to the learning value and the compensation value. In the aforesaid means, when the internal combustion engine is shifted to the specified knocking range, a compensating portion by the learning value of the means 6 is gradually decreased to the timing delay side by a means 8. |
