COMMON RAIL DIRECT INJECTION   [CRDI]

In CRDI, we have sensors for engine speed, air mass flow, crank speed, cam shaft position, turbo air boost pressure, fuel rail pressure, air temperature, coolant temperature, accelerator pedal position etc.Thus it is clear that the functioning of all electronically controlled fuel control systems depends on the inputs from different types of sensors. The ECU (Electronic Control Unit) receives these signals from sensors and after manipulation and calculations sends outputs to vary the injection timing, fuel quantity, ignition timing etc and also to control systems like the fuel injection pump, idle speed control unit, particulate trap regenerator (in a diesel engine), coolant supply etc.