ISO 3046-4:2009建立了调速系统要求和参数的分类，并规定了往复式内燃机（RIC）典型发动机转速的术语和定义。必要时，给出了特定发动机应用的单独要求。 ISO 3046-4:2009适用于陆上、铁路牵引和海上使用的RIC发动机，不包括用于推动道路建设和土方机械、农业和工业类型的拖拉机、道路车辆和飞机的发动机。也不包括自动调节发动机和只需要最大速度或最大燃油输送限制的发动机。 ISO 3046-4:2009定义了压燃式机油发动机（柴油发动机）的要求。对于火花点火发动机和双燃料发动机，可适用特殊要求。

ISO 3046-4:2009 establishes a classification for the requirements and parameters of speed-governing systems and specifies terms and definitions of typical engine speeds for reciprocating internal combustion (RIC) engines. Where necessary, individual requirements are given for particular engine applications. ISO 3046-4:2009 applies to RIC engines for land, rail-traction and marine use, excluding engines used to propel road-construction and earth-moving machines, agricultural and industrial types of tractors, road vehicles and aircraft. Also excluded are self-governing engines and those engines requiring only maximum speed or maximum fuel delivery limitation. ISO 3046-4:2009 defines requirements for compression–ignition oil engines (diesel engines). For spark ignition engines and dual fuel engines, special requirements can apply.