WinGD W-X82 - Servo Oil Pressure Setpoint

Operation4002−1/A1
Winterthur Gas & Diesel Ltd.
6/ 15
3.2.5 Monitored Items
The pressure is monitored. If the pressure is out of the tolerance, a failure indication
shows.
The sensors are monitored. If the sensors are out of range, a failure is shown. Also,
the LEDs on the FCM−20 of cylinders 3 and 4 will flash (see 0850−1 Failures and
Defects of WECS Components).
3.3 Servo Oil Pressure Setpoint
to Exhaust Valve and
Injection Control Units
Servo Oil Pumps
with Internal Press.
Controller
Supply Unit
Drive
Servo Oil
(filtered
lube oil)
FCM−20
Servo Oil
Service
Pump
Cyl. 1
System Bus
FCM−20
Cyl. 2
FCM−20
Cyl. 3
FCM−20
Cyl. 4
Safety
Valve
Servo Oil Rail (one, or two part design related to number of cylinders)
Fig. 4: Servo Oil Pressure Setpoint
3.3.1 Pressure Setpoint
Each servo oil pump has an internal mechanical pressure controller with an electrical
set-point. A pulse width modulation (PWM) signal gives this setpoint.
The FCM-20 supplies the set-point. The set-point is related to the engine load.
A closed loop control adjusts the pressure decrease in the pipes between the servo
oil pumps and the servo oil rail.
Each pressure controller of the servo oil pumps is connected to an FCM−20 on
cylinders 3 and 4.
3.3.2 Emergency Mode
If one servo oil pump becomes defective, the system will continue to operate. The
other servo oil pump(s) will continue to supply the necessary pressure to the servo oil
rail.
Engine Control System WECS-9520
2014