Operation4002−1/A1
Winterthur Gas & Diesel Ltd.
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3.6 Crank Angle Determination Algorithm (ADA)
WARNING
Injury Hazard: After an air run, the crankshaft can turn suddenly
when the pressurized air in the cylinder releases. There is a risk of
death, serious injury or damage to components.
Note: Before you do maintenance on the engine, engage the turning gear, or
start the Crank Angle Determination Algorithm (ADA) a second time:
1) Make sure that there is no pressurized air in the cylinder and the
starting air pipes.
2) Make sure that you open the relief valves on all cylinder covers to
release the pressure.
3.6.1 Crank Angle Position
The absolute crank angle position is calculated in the CCM-20. The CCM-20 use
incrementally measured values. After the CCM-20 start, the crank angle data is not
available. The engine must turn and one of the reference marks (TDC or BDC) on the
flywheel must activate one of the proximity sensors (TDC or BDC) For more data,
refer to paragraph 3.5 and 9223−1 Crank Angle Sensor Unit.
It is possible to start the engine if the crank angle data is not available. The engine
control system (ECS) uses the crank angle determination algorithm (ADA). For more
data, refer to paragraph 3.6.2.
3.6.2 Crank Angle Determination Algorithm − Operation
The ECS always uses the ADA when the crank angle position is not available or not
applicable (e.g. after a blackout or after the start of the ECS). The ECS also uses the
ADA in the procedures that follow:
D Air run
D Slow turning
D Engine start from a control location
D Engine start with starting air (general).
3.6.3 ADA Sequence
1) The ECS gets an engine start signal.
2) The ECS cannot find applicable data about the crank angle position.
3) The ECS starts the ADA.
a) The ECS calculates an applicable sequence and compressed air goes into the
cylinders.
Note: The engine can turn clockwise, counterclockwise or stay in the
initial position.
b) The crankshaft turns.
c) The ECS uses the feedback from the cylinder movement to continuously
calculate the applicable cylinder sequence. Compressed air goes into the
related cylinders.
d) One of the reference marks (TDC or BDC) on the flywheel activates one of the
proximity sensors (TDC or BDC).
e) The ECS synchronizes all ECS modules with the crank angle position.
4) The usual engine start sequence starts.
Engine Control System
2015-12
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