The pump-nozzle injection system, also known as the unit injector system (UIS), is an electronically controlled system developed by Bosch for direct diesel injection. It is suitable for cars and light-duty commercial vehicles with a cylinder capacity of up to 5 litres and engine performance of 300 HP, and was first installed in 1998 in a series-produced car and truck.
The special feature of the pump-nozzle injection system is that an individual pump is assigned to each cylinder. The pump and injection nozzle are thereby combined in a compact assembly, which is directly installed into the cylinder head. High injection pressures up to 2,200 bar are possible with the pump-nozzle injection system.
The unit pump system (UPS) is exclusively used in commercial vehicles. It is closely related to the unit injector system (UIS) for cars and light-duty commercial vehicles and allows high injection pressures up to 2,000 bar. The unit pump system was developed by Bosch, who put the technology on the market in 1995 under the name "pump-line nozzle" system.
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