In a gasoline engine, a compressed mixture of air and fuel is ignited by a spark plug. The injection system injects fuel into the intake manifold (indirect injection) or directly into the combustion chamber (direct injection). The ignition coil provides the energy for the spark plug to generate a spark. As the engine speed increases, the ignition timing is advanced. With increasing load (e.g., due to headwinds or driving on an incline), the ignition is retarded again.
