Operation4002−1/A1
Winterthur Gas & Diesel Ltd.
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3. Engine-related Control Functions
3.1 General
All engine-related control functions are divided between six of the FCM−20 (cylinders
1 to 6) for 6-cylinder to 8-cylinder engines, and eight FCM−20 for 9-cylinder engines.
The last and last but one FCM−20 are for the control functions of the cylinder
lubricating system.
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 (see Fig. 2).
A defective FCM−20 must only be replaced with the online spare.
If the online spare is installed, a new FCM−20 must be installed in the control box
E90. This FCM−20 will receive an application data download and will then become
the new online spare.
Scavenge Air
Pressure
Crank Angle
Unit
E90
FCM−20
Online Spare
FCM−20
Cyl. 7
FCM−20
Cyl. 1
Servo Oil Pump
Actuators
Servo Oil
Rail Pressure
Engine TDC
Signal
2 x SSI
2 x System Bus
FCM−20
Cyl. 6
FCM−20
Cyl. 5
FCM−20
Cyl. 4
FCM−20
Cyl. 3
FCM−20
Cyl. 2
Fuel Pump
Actuators
Common
Starting Valves
Fuel Rail
Pressure
Lubricating Pump
(each Cylinder)
Scavenge Air
Pressure
Exhaust
Waste Gate
(optional)
DATA SHOWN FOR 7 CYLINDERS
Fig. 2: FCM-20 Function in the WECS-9520 System
2014
Engine Control System WECS-9520
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