The plunger pump used is usually driven by a shared camshaft.In a unit injector, the device is usually lubricated and cooled by the fuel itself.
This provides improved vaporization from the surface of the fuel droplets and so more efficient combining of atmospheric oxygen with vaporized fuel, delivering more complete and cleaner combustion. The unit injector system is an electronically controlled system developed by Bosch for diesel direct injection. Volvo L150E Electronically Controlled Inline Diesel Fuel Systems Parts Series Production CarsIt is suitable for cars and light commercial vehicles with up to 5 l engine capacity and 312 hp engine power, the first installation in series production cars was 1998. The unit injectors are low down, below the yellow fuel passages, driven by a camshaft to their left and injecting into the centre of the cylinder liner (pale blue). Most mid-sized diesel engines used a single pump and separate injectors, but some makers, such as Detroit Diesel 5 and Electro-Motive Diesel became well known for favoring unit injectors, in which the high-pressure pump is contained within the injector itself. E.W. Ketterings 1951 ASME presentation goes into detail about the development of the modern Unit injector. Also Cummins PT (pressure-time) is a form of unit injection where the fuel injectors are on a common rail fed by a low pressure pump and the injectors are actuated by a third lobe on the camshaft. The pressure determines how much fuel the injectors get and the time is determined by the cam. In 1995, Electro-Motive Diesel converted its 710 diesel engines to electronic fuel injection, using an EUI which replaces the UI. The unit injector system allows accurate injection timing, and amount control as in the common rail system. Each injector has its own pumping element, and in the case of electronic control, a fuel solenoid valve as well. The fuel system is divided into the low pressure ( kPa ) fuel supply system, and the high-pressure injection system ( bar ). Please help improve this article by adding citations to reliable sources. ![]() The fuel can not pass back into return duct, and is now compressed by the plunger until pressure exceeds specific opening pressure, and the injector nozzle needle lifts, allowing fuel to be injected into the combustion chamber. The solenoid operation is fully controlled by the engine ECU. First available on Navistars 7.3L 444 cuin, V8 diesel engine. HEUI uses engine oil pressure to power high-pressure fuel injection, where usual method of unit injector operation is the engine camshaft. International also used the HEUI system for multiple engines including the DT 466E, DT 570, T-444E, DT-466570, MaxxForce 5, 7, 9, 10, MaxxForce DT and VT365 engines. Atlantic City, New Jersey: Electro-Motive Division, General Motors Corporation. Cite journal requires journal ( help ) CS1 maint: location ( link ). By using this site, you agree to the Terms of Use and Privacy Policy. ![]()
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