초록 ▼

An ignition control system for controlling ignition knock while maintaining minimum spark for best torque (MBT). Both knock control and MBT control are simultaneously utilized. During knock control, engine cycles are counted between successive knock detections. When the count is less than a first va

An ignition control system for controlling ignition knock while maintaining minimum spark for best torque (MBT). Both knock control and MBT control are simultaneously utilized. During knock control, engine cycles are counted between successive knock detections. When the count is less than a first value, a retard signal is generated. An advance signal is generted when the count is greater than a second predetermined value. These retard and advance signals are accumulated as knock trim signals in RAM storage locations as a function of engine speed and load operating points for each cylinder. During MBT control, MBT trim signals are generated by determining convergence of an average difference in indicated mean effective pressure for each cylinder. These MBT trim signals are stored in another RAM as a function of speed and load operating points. Base ignition timing is then corrected by both the knock trim signal and corresponding MBT trim signal at each speed and load operating point.

대표청구항 ▼

A method for controlling ignition timing in a combustion chamber of an internal combustion engine, comprising the steps of: generating base ignition timing to create an ignition spark within the combustion chamber; indicating knock occurrence in the combustion chamber; providing a count of combustio

A method for controlling ignition timing in a combustion chamber of an internal combustion engine, comprising the steps of: generating base ignition timing to create an ignition spark within the combustion chamber; indicating knock occurrence in the combustion chamber; providing a count of combustion events in the combustion chamber between two successive knock occurrences; retarding said base ignition timing by a first predetermined increment when said count is less than a first predetermined count; and advancing said base ignition timing by a second predetermined increment when said count is greater than a second predetermined count.