An accurate idle speed control for the gasoline engine with a variable valve actuation

摘要

In this research, the new concept idle speed control is designed for the gasoline engine with a variable valve actuation. This control is based on two-degree-of-freedom sliding mode algorithm. It controls engine speed by altering both the valve lift and the ignition timing of the engine. Altering the valve lift performs to compensate for large error of engine speed caused by the change of engine load, and altering the ignition timing for small error. As a result, this control can reduce the engine speed and dramatically improves the stability of idle speed control.