DL06K Interim Tire-4 Diesel Engine Disassembly and Reassembly of Major Components
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3.4. Fuel Injection System
3.4.1. Common rail fuel-injection system
z Pressure generation and fuel injection are completely decoupled from each other in the
common rail injection system. The electric control unit(ECU) determine the fuel quantity,
injection timing, and injection pressure in order to show the optimum performance on
the condition for operation of the engine, then inject the fuel in the cylinder.
z The fuel is stored under pressure in the common rail ready for injection. The injected
fuel quantity is defined by the driver, and the start of injection and injection pressure
are calculated by the ECU on the basis of the stored map. The ECU then triggers the
solenoid valves that the injector at each engine cylinder injects accordingly.
3.4.2. Major components of the common rail system
1) Electric control unit(ECU)
2) Crankshaft speed sensor
3) Camshaft speed sensor
4) Accelerator pedal sensor
5) Fuel temperature sensor
6) Boost pressure and temperature sensor
7) Common rail pressure sensor
8) Coolant temperature sensor
z Using the input signals from the above sensors, the ECU registers the driver’s
requirements(accelerator pedal setting) and defines the instantaneous operating
performance of the engine and the vehicle as a whole. On the basis of this
information, it can then intervene with open and closed-loop controlling action at
the vehicle and particularly at the engine.
EK3OM004
Fuel tank
Primary fuel filter
Fuel filter
ECU
Common rail
Injector
Cylinder head
Fuel high pressure pump
(CP 3.3 NH fuel pump )
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