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Introduction

MAN B&W ME-C series. Introduction

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The introduction of the electronically controlled camshaft-less low speed diesel engines, which is now gaining momentum, is a milestone in diesel technology that deserves a place in history like Rudolf Diesel’s first engine in Augsburg, the 1912 motor vessel Selandia, the introduction of turbocharging on two-stroke diesels in 1954, and the first SCR (Selective Catalytic NOx Reduction) systems on ships in 1989.

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Camshaft-controlled diesel engines have been the state of the art ever since the birth of reciprocating machinery and have been refined and developed ever since. However, a mechanical cam is fixed once made and, in spite of various mechanical and hydraulic add-on devices like VIT, etc., timing control possibilities  are limited with mechanical cams. Not least fuel injection pressure control and variation over the load range have limitations with a cam-controlled engine.
Therefore, the main purpose of changing to electronic control is to ensure fuel injection timing and rate, as well as the exhaust valve timing and operation, exactly when and as desired.

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Electronically Controlled Engines. WHY?
To ensure:

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  1. fuel injection timing and rate
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  3. exhaust valve operation
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  5. cylinder oil feed rate
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Precisely when and as desired

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Especially with respect to the fuel injection rate, the control system has been so designed that it is possible to maintain a rather high injection pressure also at low load, without the limitation from the camshaft-controlled engine, where this would result in too high pressure at high load. Both the ‘cam angle, inclination and length’ are electronically variable. In addition, the ME engine features electronic control of the cylinder lube oil feed, by having our proprietary Alpha Lubrication integrated in the system. With the Alpha Lubrication system, about 0.3 g/bhph cyl. oil can be saved, compared with engines with mechanical lubricators.
The electronic control of the engine fuel injection and exhaust valves improves low-load operation, engine acceleration, and give better engine balance and load control, leading to longer times between overhauls, also by implementation of enhanced diagnostics systems. It will give lower fuel consumption, lower cylinder oil consumption and, not least, better emission characteristics, particularly with regard to visible smoke and NOx.

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Electronically Controlled Engines. WHY?
To improve:

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  1. low load operation
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  3. SFOC & SLOC
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  5. engine versatility
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  7. emissions (NOx, soot, smoke)
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  9. time between overhauls
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  11. diagnostics systems
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  13. etc.
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For the ME engines, the electronic control system has been made complete. Hence, the ME engine features fully integrated control of all functions like the governor, start and reversing,, fuel, exhaust and starling valves, as well as cylinder oil feeding.

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The ME engine is an engine with fully integrated control of

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  1. starting air valves
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  3. start and reversing sequences
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  5. governor function
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  7. auxiliary blowers
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  9. electronically profiled injection control
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  11. exhaust valve actuation
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  13. cylinder oil feed rate
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