A controller and design implementation environment for the idle speed control of an internal combustion engine

At idle the engine throttle is closed and the airflow into the engine is typically controlled by the opening of a simple electromechanical valve actuated by the engine's electronic engine management system. This provides the principal means to control engine speed. It is commonly supplemented by control of the spark advance to modulate engine torque production. This is an input which acts quickly but is limited in authority. The MATLAB/SIMULINK engine model and its role in control law development are described.