Service Information
Document Title:
Function Group:
Information Type:
Date:
Engine Protection
200
Service Information
2014/8/27
Profile:
ART, A35E FS [GB]
Engine Protection
Engine protection, function description
Introduction
The engine control unit contains functionality that is to protect the engine from damage and minimize repair costs for
damages that may occur in the engine's different systems. The parameters that activate the engine's protection system are:
Low oil pressure
Increased oil temperature
Increased coolant temperature
Low coolant level
Increased crankcase pressure
Increased charge-air temperature
Increased boost pressure
EGR-system
Failure of flywheel's speed (rpm) sensor
Water in fuel
When the level of any of these parameters reaches the risk zone, different protective actions may be activated:
Warnings
Reduced torque (only in case of signal from sensors for EGR-system or in case of failure of the flywheel's speed
(rpm) sensor)
For examples of levels where engine protection is activated and which limitations are activated, see
and
3012 12F2604, brake cooling oil, circulation
3012 1F2003, limitation engine protection (EMS)
Warnings
There are several alarm levels for warnings. Yellow warning indicates a less serious malfunction or level, and red warning
indicates that the engine must be turned off. For detailed description, see
387 Warning screens, general
Reduced torque
The engine protection function can limit the torque to reduce damage and repair costs in case the operator does not notice
that a warning has been activated. Limited torque is activated in two cases:
Error
Limitation
EGR-system
7 %
Failure of flywheel's speed (rpm) sensor
10 %
The limitation is active until the parameter has returned to a safe level or until EMS is powered down.
Degrees of engine protection
By using different programs (software) it is possible to set different degrees of engine protection. Regardless of what degree
of engine protection that has been selected, the operator always receives a warning when there is a malfunction.
Oil pressure
Since it takes a little while for the oil pressure to build up, there is a delay after the engine has been started until the
pressure measurement takes place. The oil pressure is dependent on the engine speed, and thus there is no fixed limit for
when the oil pressure warning is activated. Instead the pressure is compared to the current engine rpm.
Coolant temperature
The coolant's boiling point is dependent on the ambient air pressure, that is, at which altitude the machine is operated,
Содержание D12D
Страница 2: ...Figure 2 Engine identification D12D ...
Страница 6: ...Figure 2 Certification decal ...
