The principal task of electronic engine management is coordination of all parameters through continuous process control in order to assure economical and ecological engine operation. The parameters controlled include ignition timing, the amount of fuel injected, injection timing and exhaust gas recirculation, as well as throttle plate position, variable intake manifold positions, turbine geometry (on engines with turbocharger) and the camshaft settings (on spark-ignition engines). In order to perform these tasks, the electronic engine management system also monitors the engine speed, engine temperature, fuel grade (via knock sensor) and accelerator pedal position. Deviations from normal operation are stored with corresponding information in the system memory.