DARDANOS solenoid valve control systems combine their main function – speed control – with other performance characteristics that benefit the engine, including optimised fuel efficiency, higher engine power and lower pollutant emissions. The EFI control units are used as part of common rail or E-PPN injection systems in diesel engines. For gas engines, they are combined with electrically driven injection valves or gas injectors. Components for diesel and gas injection are used as part of the electronic injection control system in dual-fuel engines.