Idle speed control system for internal combustion engine, has spark timing module regulating idle speed of engine including adjustment of spark timing for cylinders individually based on period differences

摘要

The system (10) has a piston reciprocation module determining reciprocation periods of piston of cylinders (20) of an engine (12) based on engine speed signal. A difference module determines a period difference between the reciprocation periods and an idle period associated with a target idle speed. A spark timing module regulates idle speed of the engine including adjustment of spark timing for the cylinders individually based on the period differences. An average reciprocation module calculates an average reciprocation period based on the period differences. Independent claims are also included for the following: (1) a method for regulating an idle speed of an engine (2) a method for generating a common torque from each cylinder of an engine.