DL06K Interim Tire-4 Diesel Engine Disassembly and Reassembly of Major Components
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z The engine speed is measured by the crankshaft speed sensor, and the camshaft
speed sensor determines the firing sequence (phase length). The electrical signal
generated across a potentiometer in the accelerator pedal module informs the
ECU about how far the driver has depressed the pedal, the engine is equipped
with a turbo charger and boost pressure control, the boost pressure sensor also
measures boost pressure.
z At low outside temperatures and with the engine cold, the ECU applies the data
from the coolant temperature and air temperature sensors to adapt the set point
values for start of the particular operating conditions.
3.4.3. Injection characteristics with common rail
z Injection characteristics with common rail, compared to conventional injection
characteristics, the following demands are made up on an ideal injection
characteristic, Independently of each other, injected fuel quantity and injection
pressure should be definable for each and every engine operating condition.
z At the beginning of the injection process, the injected fuel quantity should be as
low as possible (that is, during the ignition lag between the start of injection and
the start of combustion)
z The common rail system is a modular system, and essentially the following
components are responsible for the injection characteristic.
- Solenoid valve controlled injectors which are screwed into the cylinder head
- Common rail
- Fuel high pressure pump
- Electric control unit(ECU)
- Crankshaft speed sensor
- Camshaft speed sensor
EE1OM094
Fuel injection of injection pump
Pm : Main injection pressure
Ps : Max. injection pressure
Common rail fuel injection
Pm : Main injection pressure
Ps : Max. injection pressure
Time t
Start of delivery
Start of injection
Pm
Ps
Injection pressure P
Time t
P
R
(Pm)
Injection pressure P
Fuel injection
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