Common Rail System for Passenger Cars

Common Rail System: Design and Construction

Diesel Works services the following common rail injection systems:

• Bosch
• Delphi
• Denzo
• Siemens
• Piezo.

The high-pressure pump forces the fuel into the high-pressure accumulator (rail). Here, the fuel is stored ready for injection at the appropriate pressure for the particular engine operating conditions.

The driver's requirements are inputted through the accelerator pedal and registered by the ECU together with the operating status. The ECU then uses maps to calculate the required injection pressure and the duration of injection (in other words, the fuel mass), and the instant of injection. Each of the engine's cylinders is allocated an injector with integral solenoid valve whose opening and closing points define the start and end of the injection process. The Common Rail System is an accumulator injection system. The decisive difference to all other forms of injection system lies in the fact that the pressurization and injection processes are completely independent of each other. The Common Rail System's strategy affords enhanced flexibility for adapting injection processes to reflect the demands of each specific application. It serves as the basis for developing extremely smooth and economical engines offering impressive levels of dynamic response.

The CRS consists of:

• Low-pressure system with presupply pump, filter
• Rail
• High-pressure pump
• Injectors
• ECU with sensors and diagnostic interface