Alimentação de combustível e controles

Fuel Charging and Controls–3.2LDuratorq-TDCi(148kW/200PS) 303-04C-2 303-04C-2 - Puma DESCRIPTION AND OPERATION Fuel Charging and Controls Overview 1 6 4 5 3 E129822 Item Description 1 Fuel rail 2 Fuel injector(s) 3 Fuel pressure (FRP) sensor 4 Fuel metering valve 5 Fuel temperature sensor 6 Fuel pump General A common rail fuel injection system is used on the 3.2L Duratorq-TDCi (Puma) diesel engine. Within the fuel pump there is an integral fuel transfer pump which draws the fuel from the fuel tank to the fuel pump. A fuel metering valve is located in the supply port to the high-pressure chamber of the fuel pump. The fuel metering valve varies the quantity of fuel 2 supplied to the fuel rail and fuel injector(s), in relation to the driving conditions. The fuel is supplied at high-pressure to the fuel rail and to the fuel injectors ready for injection. Depending on engine operating conditions, the fuel injection pressure varies between 230 bar and 1600 bar. Fuel system pressure is measured using an FRP sensor located in the fuel rail. The FRP sensor converts the fuel system pressure into a voltage signal. This voltage signal acts as an input signal to the powertrain control module (PCM) for calculation of the fuel injection quantity. The power train control module (PCM) calculates the time of fuel injection and the fuel injection quantity depending on various input variables. The specified quantity of fuel is injected into the respective combustion chamber through the solenoid actuated fuel injector(s). In doing so, a pre-injection and a main injection occur each time. The excess fuel is returned to the fuel tank through the fuel return line.