Fuel Injector (8/6 - 8/9) [2017-2022]: Variants
Diesel
The i-ART (intelligent accuracy refinement technology) fuel injector is embedded with a pressure and a temperature sensor. The fuel injector also has an embedded chip that stores its identification, as well as information for basic adaptation. The fuel injector is able to compensate for individual characteristics and spray the ideal amount of fuel based on the information from the sensors.
The Engine Control Module (ECM) gets the temperature signal from LIN and the pressure signal from a direct connection. Each fuel injector has an individual LIN bus with the Engine Control Module (ECM).
|
Gasoline
The Engine Control Module (ECM) controls the fuel injectors regarding injection timing and injection length. The fuel injectors' capacity differs between the different engine performance levels. The maximum flow (static flow rate) differs between the fuel injectors. The value for varies from about 20 cm3 /s and 17.5 cm3 /s. The values apply at a fuel pressure of 10 MPa (100 bar).
The fuel quantity and thus the injection time at idle varies depending on alternator and A/C compressor load, but is within the range of 0.9 - 1.5 ms and with a fuel pressure of between 5 - 15 MPa (50 - 150 bar). At maximum power output the injection time is 6 - 7 ms and the fuel pressure is 20 MPa (200 bar).
The fuel injectors are high pressure, multi-hole, solenoid powered injectors. The function of the fuel injector is to attain an optimized mixture of fuel and air in the combustion chamber. When the engine runs homogeneously, fuel is injected early during the inlet stroke (piston on its way down) which means that the spray has time to homogenize with the air before the ignition takes place.
|