Volvo D4, Руководство оператора

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14
Presentation
Engine Management System
The engines are equipped with common rail system
and electronically controlled injectors with an elec-
tronic control module.
The injectors contain an electro-magnetic valve which
sets the amount of fuel injected and the correct tim-
ing. The monitoring system measures the charge air
pressure and temperature, and calculates the avail-
able air mass. This determines the maximum amount
of fuel that can be injected (smoke limiter function).
The system also limits the maximum torque available
at the engine speed registered to protect the engine
from overload.
Engine Management and EVC system
To protect the engine at too high coolant or charge air
temperatures and boost pressure as well as oil pres-
sure the monitoring system reduces the amount of
fuel (reduced engine output) until the current values
normalises.
The engine monitoring system also has a diagnostic
system, which assists users and service technicians
to quickly determine the cause of any malfunctions in
the system using the diagnostic lamp or a diagnostic
tool.
Any fault is shown as a series of flashes on the diag-
nostic lamp.
Helm station Con-
trol Unit
(HCU)
Power train
Control Unit
(PCU)
Engine Management
System
(EMS)
Helm station Con-
trol Unit
(HCU))
CAN bus