The Unit Injector-System (UIS) is a system for diesel direct injection. This technology is also known as the pump-nozzle system. In 1994 Bosch supplied he world’s first UIS for commercial vehicles. Its special feature is that it combines the injection pump and injection nozzle in one unit (Unit Injector).

Bosch employs Unit Injector Systems particularly in heavy and medium-sized commercial vehicles with performances of up to 80 kW per cylinder and up to eight cylinders. If two control units are used, this technology is also suitable for engines with up to 16 cylinders.