The unit pump injection system (UPS) injects the fuel into the engine cylinder. It consists of an electronically controlled unit pump and a nozzle holder assembly connected via a precisely adapted high-pressure line. The unit injector system (UIS) is a nozzle holder assembly with integrated high-pressure pump.
of injection pressure for efficient combustion.
of reliable operation due to robust system design.
Unit-pump-system and unit-injector-system
Proven for many years, the unit pump system is an injection system consisting of an electronically controlled unit pump and nozzle holder assemblies with injection pressures of up to 1,800 bar. A fuel pump (injection pump) is fitted for each engine cylinder. The pump piston is fitted in the pump cylinder with such precision that high injection pressure is guaranteed, even at low speeds. A 2/2-way valve provides the full range of functions.
The valve closes against the high-pressure circuit with the fuel feed or outlet. The injection start and duration determined by the camshaft profile can be adapted as required. As a result, the injection pressures and delivery rates required for efficient combustion are available, even at low speeds. The nozzle holder assembly is selected to match the delivery rate, spray form and injection pressure.
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