Engine Governor Control
Engine Governor Control
(OP)
A couple of basic questions about Diesel engine Governor control:
The speed droop is adjustable from 0 to 10% or 5% . Is 10% better ?
What is the steady state frequency regulation ? I was told it is 0.33%. It doesn't sound right.
Any input would be appreciated.
The speed droop is adjustable from 0 to 10% or 5% . Is 10% better ?
What is the steady state frequency regulation ? I was told it is 0.33%. It doesn't sound right.
Any input would be appreciated.





RE: Engine Governor Control
Bill
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"Why not the best?"
Jimmy Carter
RE: Engine Governor Control
RE: Engine Governor Control
Droop is proportional, isochronous is proportional plus integral.
3% droop is a good compromise between tight control and stability.
Bill
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"Why not the best?"
Jimmy Carter
RE: Engine Governor Control
RE: Engine Governor Control
RE: Engine Governor Control
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Engine Governor Control
RE: Engine Governor Control
RE: Engine Governor Control
If there are offices with a lot of computers and small UPSs you may have some frequency issues.
You can consider a load control panel to run both sets in isochronous mode. You may still get some momentary beeping from the UPSs when a heavy load hits.
Catserveng is more familiar than I with load control panels.
Bill
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"Why not the best?"
Jimmy Carter
RE: Engine Governor Control
Larger droops are usually applied to industrial drives and engines driving equipment, typical on-hiway truck engines with hydra-mechanical governors had droop from 6 to 10%, about the same with marine propulsion engines.
I rarely apply speed droop settings in systems I work on as they are all isochronous load share systems using a Woodward, Basler, ComAp or similar load control systems, especially on engines with integrated governing in their ECM's. In some cases if required and the controls are setup for it we apply 3% speed droop for a manual control mode if the engine controls can use an input to switch in and out of droop.
On the steady state frequency, the spec usually comes from ISO 8528-5, performance class (grade) 3 is at 0.5% for steady state frequency. Depending on engine size and things like fuel systems and turbo's, steady state frequency can be improved but usually at the expense of poorer transient response, at least in my experience.
Hope that helps, Mike L.
RE: Engine Governor Control
i've seen marine diesel generator-set attains 3-5% droop max.(woodward governor) however; 10% droop is unusual for generator application.
"..the more, the merrier" Genghis Khan