Group 28 Design and Function
Starting the engine
Before any fuel can be injected into the cylinders, the
EECU must have had a sufficient amount of time to
carry out the first calculations on injection angles and
fuel quantities. This time is equivalent to two engine rev-
olutions.
VEB (VOLVO engine brake)
The VEB consists of an exhaust brake and a compres-
sion brake. The EECU activates the VEB when the
following conditions are satisfied:
•
Accelerator pedal at idling position (fuel injection
must not occur).
•
Engine speed must exceed 1200 rpm.
•
Clutch pedal must not be depressed.
•
Boost pressure must be lower than 152 kPa (22 psi)
(overpressure).
•
PTO not activated.
•
Vehicle speed is greater than 3.2 km/h (2 mph).
•
ABS not activated.
•
Engine coolant temperature is greater than 40 ± 2
C (104 ± 5
F).
•
Engine oil temperature is greater then 55
C (130
F).
The VEB may be activated when the cruise control is in
use. For this to take place, the following condition must
be satisfied:
•
Vehicle road speed must exceed the set speed of
the cruise control by between 5 and 30 km/h (4 and
20 mph), depending on what level has been pro-
grammed into the EECU.
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