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For safety, all important input and output signals of the modules have redundancy. If an FCM-20
becomes defective, the engine will continue to operate. The power supply also has redundancy.
A defective FCM-20 must only be replaced with the online spare.
If the online spare is used to replace a defective FCM-20, a new FCM-20 must be installed in
the online spare position. This new FCM-20 will receive an application data download and will
then become the new online spare.
If an IOM-10 becomes defective or the bus connection is disconnected, the alarm and
monitoring system (AMS) shows a bus connection failure or an IOM-10 failure. But, the AMS
does not show the related signals from the affected IOM-10.
If the Modbus connection between the E90 control box and the AMS is disconnected, all signals
of WECS-9520 will not be transmitted to the AMS. This is because the WECS-9520 serves as a
gateway for the IOM-10 signals.
If an IOM-10 becomes defective, only the related signals from the defective IOM-10 will not be
transmitted.
6.2.3.1
Fuel pressure control
6.2.3.1.1
Engine start
At engine start, the fuel pump actuators are set to the start position.
6.2.3.1.2
Engine operation
The fuel pressure is related to the engine load. The control loop for the fuel rail pressure is
given as follows:
•
The WECS-9520 generates a control signal, which is related to the engine speed and the
fuel command.
•
The signals from the FCM-20 control the fuel pump actuators. Each actuator controls two
related fuel pumps through the toothed rack.
•
Two pressure transmitters (PT3461-62C) measure the fuel pressure. This fuel pressure
data is transmitted to the FCM-20 of cylinders No. 3 and No. 4.
•
The pressure transmitters PT3431-37C are connected to the IOM-10 and send the
pressure value through a bus communication line to the WECS-9520.
•
The temperature sensors TE3431-38C are installed on the HP fuel pipes between the
fuel pumps and the accumulators. If there is a difference between the fuel temperatures,
an alarm is activated in the WECS-9520 for the related fuel pump.
6.2.3.1.3
Engine shut-down
At engine shut-down, the fuel pump actuators are set to position zero and the safety system
activates the fuel pressure control valve.
6.2.3.1.4
Emergency mode
If a fuel pump actuator becomes defective, its control output stays in position or turns slowly to
zero supply. Each of the two related fuel pumps will not supply fuel.
X92DF
AA00-0000-00AAB-043K-A
Operation Manual
Engine control system WECS-9520
Winterthur Gas & Diesel Ltd.
- 261 -
Issue 002 2020-08
Содержание X92DF
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