3 4 Wecs8000 Functions w34sg v00r07cb0809a001l 01en Ppt

8/5/2009

W34SG-V00R07CB0809A001L_01en / Turku Training Centre 1

1 © Wärtsilä 5 August 2009 W34SG-V00R07CB0809A001S_01en / Turku Training Centre

AUTOMATION SYSTEMWÄRTSILÄ 34SG V-engine

WECS 8000


AUTOMATION SYSTEM

Fig. name: Engine modes

The main control function in WECS controls and activates the engine modes.

The engine mode will be changed according to a request only, if the request has a higher priority than the active engine mode.

Engine modesGeneral

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AUTOMATION SYSTEM

WECS 8000 performs a number of continuous control processes on the engine, when the engine is in run mode. Below, a brief description of each of these processes.

Engine control processes during operation

Processes can be divided into categories� Gas feed system

� Main gas injection� Air/fuel ratio� Ignition control

� Engine speed- and load control� Exhaust gas temperature control

General


AUTOMATION SYSTEM

Fig. name: Gas feed system

� The gas supplied to the engine passes at first an external gas regulating unit (GRU).

� The unit consist of:� Filter� Pressure regulating valves

� Safety (shut-off) valves� Ventilation valves

Engine control processes during operationGas feed system

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AUTOMATION SYSTEM

Fig. name: Main gas injection

The amount of main gas admitted to each cylinder is controlled by the main gas solenoid valves which are connected to the CCM.

The duration is controlled by the load/speed PID-controller so that speed and/or load always match their references.

Engine control processes during operationMain gas injection


AUTOMATION SYSTEM

Fig. name: Air/Fuel ratio control

The air pressure in the receiver is controlled by a waste gate valve.

For this pressure control a continuous receiver air pressure, alternatively an average exhaust gas temperature measurement is carried out and calculated.

Engine control processes during operationAir/Fuel ratio control

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AUTOMATION SYSTEM

Fig. name: Ignition control

The engine ignition system consists of two ignition coil drivers (WCD-10), one for each bank.

The WCD-10s controls cylinderwise ignition firing each cylinder.

The ignition timing and dwell time duration changes with engine load.

Engine control processes during operationIgnition control


AUTOMATION SYSTEM

Fig. name: High voltage circuit

The ignition is of inductive discharge type and the driver circuitry offers ramp-and-fire operation. This minimizes power losses in the ignition driver.

Engine control processes during operationHigh voltage circuit

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AUTOMATION SYSTEM

Fig. name: Exhaust gas temperature control


System components� 01 Main gas admission valve� 02 Knock sensor

� 03 Exhaust gas temperature sensor

� 04 Cylinder liner temperature sensor

Exhaust gas temperature control

The main control module compares each cylinder’s exhaust gas temperature with the average exhaust gas temperature of the entire engine and adjusts the duration of the individual gas valves with an offset in order to minimise the deviation.

Exhaust gas temperature control is used on low loads.


AUTOMATION SYSTEM

Fig. name: Exhaust gas temperature control


System components� 01 Main gas admission valve� 02 Knock sensor

� 03 Exhaust gas temperature sensor

� 04 Cylinder liner temperature sensor

Knock margin control

The main control module compares each cylinder’s knock margin values and adjusts the duration of the individual gas valves with an offset in order to keep the correct margin.Knock margin control is used on high loads.

3 4 Wecs8000 Functions w34sg v00r07cb0809a001l 01en Ppt

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