HPI (High Precision Injection)

Abbreviation HPI indicates a new generation of BMW engines with gasoline direct injection. HPI engines can regulate the air-fuel ratio with an accuracy of two milligrams of gasoline. Fresh air is controlled by Valvetronic. The motors are equipped with Twin Scroll tubodmychadlem that increases engine performance.

The new generation of engines HPI (High Precicion Injection) BMW is equipped with advanced gasoline direct injection system and a number of other innovative technologies that contribute to increasing engine efficiency. The engine was developed jointly by PSA and BMW. A similar engine then find the Citroen car ( HPI ) and Peugeot ( THP ). designers have managed to significantly increase the speed range where the engine can burn a lean mixture, which is one of the main prerequisites for reducing fuel consumption in real traffic. Sometimes this principle is called well as the burning of layered compounds and in practice it requires extraordinary precision in the management and composition of the mixture of fuel and air.

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Unlike the first generation of direct gasoline injection, the BMW intentionally not used, the new generation more efficient. The increased efficiency also contributes to the fact that the engine has a centrally located piezo stored in the immediate vicinity of the spark plug. This allows more precise fuel metering and maintenance of lean in a wide range of operating conditions. High pressure in the cylinder head pump supplies fuel electric pump located in the fuel tank, whose activity is controlled by the actual needs of the engine at any given time. Pressure within the common line common rail pressure is 20 MPa. Needles piezoelectric injectors react extremely quickly and accurately to commands specifically developed engine control unit. Another advantage over conventional electromagnetically controlled injectors to deliver is the ability piezovstřikovačů into the cylinder during one cycle of up to six doses gently rozprášeného fuel injected in a well-circumscribed cone. It is this ability to actively create conditions for controlled, clean and complete combustion of lean in a wide load range and speed.