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Common Rail provides additional flexibility for the design and application of a diesel injection system. Contrary to conventional injection systems pressure generation and injection are decoupled in the common rail system. The injection pressure can be selected independent of engine speed and injected fuel quantity within certain limits. The fuel combustion and the corresponding noise can be improved by increasing the fuel pressure up to 1400 bar and introducing pilot injection or multiple injection. Furthermore the common rail system can replace conventional injection systems without requiring major engine modifications. BOSCH will provide this new injection system for the whole range of applications from light duty (30 kW per cylinder) to heavy duty vehicles (50 kW per cylinder).

The Bosch Common Rail Fuel Injection System with the new technologies developed for the Duramax 6600 engine offer numerous performance advantages including exhaust emissions control and noise. The layout of the fuel system components and electrical parts is specifically designed to control fuel injection characteristics. The new injector and nozzle technology was integrated to achieve the required system performance. The new 1600bar fuel pump is also a prerequisite for required system performance.