Unit Pump System

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The Unit Pump system is a modular high-pressure diesel injection system,  the system is closely related to the Unit Injector system UI, this system is mainly developed for use in commercial vehicle diesel engines.
The systems use a separate injection pump placed on the engine mountings for each cylinder so it is primarily designed for OHV or "cam in the block" engines. The fuel pumps are driven by an extra camshaft lobe where each pump unit is connected to the injector via a short precise length high-pressure fuel line as opposed to Unit Injector systems which combines both a pump and an injector element in a compact unit.
Both systems feature electronically controlled fuel solenoids for precise timing and the injection of fuel quantity is variably adjusted for each cylinder.
The high-pressure pump is driven directly by the engine camshaft. The pump’s high delivery rate ensures a continuous rise in pressure during the entire duration of the injection.
The injection valves meter the fuel with the help of high-speed solenoid valves. These are triggered by the electronic engine control unit. With variable injection start, variable injection duration, great latitude in adapting to the engine’s operating conditions as well as cylinder-specific correction capabilities, UPS contributes toward environmentally-friendly and fuel-saving engine operation.
The Unit Pump System is used for commercial-vehicle engines with performances of up to 80 kW per cylinder and up to eight cylinders. The electronic control unit can trigger a system comprising a maximum of eight cylinders. A second control unit allows the system to be extended to 16 cylinders.
Benefits 
  • Economical fuel consumption
  • Low emissions
  • Easy conversion from fuel-injection systems with in-line or distributor pumps 
  • Simple and fast customer service as the pumps can be exchanged easily
  • no need to redesign the cylinder head

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