After each speed change, the compression of the diesel engine governor speeder spring is returned to a constant value, regardless of the amount of movement of the fuel control mechanism and engine load. Hence, this results in __________.
ā¢ Governor speed control characteristics (how speed changes with load) ā¢ Difference between isochronous and speed droop governing ā¢ Role of the speeder spring compression in setting engine speed
ā¢ Ask yourself: if the speeder spring compression always returns to the same value after a speed change, what does that say about how the governor treats speed versus load? ā¢ Consider which type of governing keeps the set (reference) speed effectively constant once adjusted, and which type allows a deliberate change in speed as load changes. ā¢ Think about whether a constant speeder spring compression would allow or prevent a permanent speed drop when load increases.
ā¢ Verify which governing mode has no permanent speed change between no-load and full-load at a given setting. ā¢ Check the definition of speed droop: does it involve a constant or changing speeder spring compression as load changes? ā¢ Confirm how isochronous governing is usually described in textbooks with respect to reference speed and governor spring setting.
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