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Basics electronic speed Governor

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© MAN B&W Diesel Aktiengesellschaft, Augsburg

This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net

MAN B&W Diesel Training basic electronic speed governor

Why do we need Governors?

•Power sources must be controlled to be converted to useful work. •Uncontrolled prime movers, not operatingat desired speed or load are examples of why governors are needed.

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© MAN B&W Diesel Aktiengesellschaft, Augsburg

This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net

MAN B&W Diesel Training mechanical speed governors basic electronic speed governor

What is a Governor?
•Governor Definition: a: An attachment to a machinefor automatic control or limitation of speed. b: A device giving automatic control (as of pressure or temperature). •A Governor is a device which controls the energy source to a prime mover to control its power for a specific purpose. •Basic governors sense speed and sometimes load of a prime mover and adjust the energy source to maintain the desired level. •Advanced governors are often referred toas Control
Systems.
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This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net

MAN B&W Diesel Training mechanical speed governors basic electronic speed governor

Simple explanation of governing
Imagine you are driving a car. The speed limit on the road is 60 km/h and you want always togo that fast it is allowed. In that case you have to “control” the accelerator depending of driving up- or downhill.

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© MAN B&W Diesel Aktiengesellschaft, Augsburg

This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net

MAN B&W Diesel Training mechanical speed governors basic electronic speed governor

Constant Load

DESIREDSPEED
MAN B&W Diesel Training basic electronic speed governor

ACTUAL SPEED

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© MAN B&W Diesel Aktiengesellschaft, Augsburg

This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net

Constant Load
•The driver of the car is the control or governor.
MAN B&W Diesel Training mechanical speed governors basic electronic speed governor•The speed limit sign is the desired speed setting. •The speedometer senses actual speed. •The driver compares desired speed to actual speed, If they are the same, fuel is held steady. •If desired speed and actual speed are different, the fuel setting is adjusted by the driver to make actual speed equal desired speed. •Fuel is held steady until a speed or load change occurs.
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This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net

Increased Load
SPEED LIMIT

60
MAN B&W Diesel Training basic electronic speed governor

Increase Fuel

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© MAN B&W Diesel Aktiengesellschaft, Augsburg

This document, and more, is available for download from Martin's Marine Engineering Page -www.dieselduck.net

Increased Load

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© MAN B&W Diesel Aktiengesellschaft, Augsburg

This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net

MAN B&W Diesel Training mechanical speed governors basic electronic speed governor

• The car starts up the hill, load increases, speed decreases. • The actual speed is less than desiredspeed. • Driver increases the fuel to increase the speed, which returns the actual speed to the desired speed. • Before the actual speed reaches the desired speed, the driver reduces the fuel to prevent overshoot of speed. This is called Compensation and is adjusted to match the response time of the prime mover. • It takes more fuel to pick up load than to maintain load.

Decreased Load

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