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Tractor Talk Discussion Forum

Question on Governor Operation for you !!!

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Way Up Here

06-09-2005 19:37:51




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I know what you'd call the basic purpose and function of an engine governor, plus I realize that there are numberous governor design types as well as a variety of linkage hookups between the throttle, carb, and governor to control engine RPM's. Here is my question .... DOES A GOVERNOR ATTEMPT TO OPEN OR CLOSE THE CARB THROTTLE PLATE? Or maybe it could be one way or the other depending on the layout and operation of the parts. Anyone out there clarify just how this works? Maybe there is a link as to an article or something so I can get this clear in my mind.

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Rod F.

06-10-2005 10:00:56




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 Re: Question on Governor Operation for you !!! in reply to Way Up Here, 06-09-2005 19:37:51  
Let's back the truck up a minute. A govenor does both of these things. A govenor's function is simply to control engine speed. As stated in other posts, there are several types of govenors. Essentially, the operator will set a speed at which the engine will run. As load increases or decreases, the govenor will attempt to compensate, and bring the engine back to the set speed. If load increases, speed will begin to decrease, then the govenor will cause the throttle plate to open, or increase fuel delivery. If load were to decrease on the engine, then the engine will tend to increase it's speed. In this condition, the govenor senses this, and causes the throttle plate to close, or reduce fuel delivery. Govenors come in a variety of types, including; mechanical, pneumatic, hydraulic, and electronic, with electronic being the most precise. Take care.

Rod

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xragman

06-10-2005 06:49:26




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 Re: Question on Governor Operation for you !!! in reply to Way Up Here, 06-09-2005 19:37:51  
a governor is basicaly a balanceing act between a spring force in one direction and centrufical force in the opposite direction. whether it closes or open a throttle plate is up to the disigner.



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Bob M

06-10-2005 08:30:12




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 Re: Question on Governor Operation for you !!! in reply to xragman, 06-10-2005 06:49:26  
Unnnh - not quite...

ALL governors use spring force (or in the case of some steam engines, gravity) to drive the throttle open.

The throttle closing force generally comes from centrifugal force developed by a pair of spinning flyweights - although it can also come from hydraulic, pneumatic or electrical means in certain applications.

Control is achieved by the balancing of the spring vs the centrifugal forces in the governor system.

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Farmered

06-10-2005 05:41:38




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 Re: Question on Governor Operation for you !!! in reply to Way Up Here, 06-09-2005 19:37:51  
Allen is correct. Both. The governor will try to get the engine to return to a preset speed. I say try because a change of speed is necessary for the governor to operate. ie. the speed must drop for the governor to operate and open the throttle.
The percentage of change is called droop. The amount of droop on a typical tractor governor is 5 to 8 percent, more if there is wear or binding.
A precision electronic governor can get droop down to less than 1%. I base this information on years of experience at Woodward Governor Company,
Fort Collins CO. Ed

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Ernie Bob

06-10-2005 22:54:52




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 Re: Question on Governor Operation for you !!! in reply to Farmered, 06-10-2005 05:41:38  
Ed,

Woodward makes a good govenor, we use them at the City of Boulder on our Wakeshaw generators. Do they make electronic govenors for the old Farmall tractors?

Thanks!
Ernie Bob (CO)



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Farmered

06-11-2005 05:23:07




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 Re: Question on Governor Operation for you !!! in reply to Ernie Bob, 06-10-2005 22:54:52  
Ernie Bob, I suppose that an electronic governor could be adapted to any application, but your Farmall better be worth $100,000 if you want to addapt a Woodward governor to it. You'd have to sell the arm to pay for it. Intersting to think of the possiilities though. Ed



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Red Dave

06-10-2005 06:10:40




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 Re: Question on Governor Operation for you !!! in reply to Farmered, 06-10-2005 05:41:38  
Woodward? I remember the speed droop classes, wake me when it's over ZZZZZ ZZZ ;)
I spent several weeks at Rockford back in the '80's studying hydro turbine governors. All the hydro business is owned by GE now, I understand.

Shame to see such a great old name being ground to dust by GE :( but that's the era we live in, I guess.



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Farmered

06-11-2005 05:10:20




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 Re: Question on Governor Operation for you !!! in reply to Red Dave, 06-10-2005 06:10:40  
Red Dave, I worked for Woodward back when all the new car dealers in Fort Collins knew when the Woodward bonus checks came out. They measured their success by how many thousands of dollars worth of orders they had in the in-basket and didn't know what "just-in-time" ment. Their old fashoned business practices hurt them when their competition modernized. Bet we could have a good time talking about old times. Ed

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Allan in NE

06-10-2005 04:38:41




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 Re: Question on Governor Operation for you !!! in reply to Way Up Here, 06-09-2005 19:37:51  
Both,

All mechanical govenors that I have ever worked on, be they fly-weight or vacumn design, use spring pressure initially to pull the throttle open and then the oppossing weights or vacumn pressure to pull the throttle back closed again.

Allan



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NC Wayne

06-09-2005 20:03:47




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 Re: Question on Governor Operation for you !!! in reply to Way Up Here, 06-09-2005 19:37:51  
Every one of the governor designs I've seen over the years are designed to close the throttle plate. They are designed in this way because no matter what it's application an engine always starts under some amount of "load" wether it's coupled to a piece of equipment or it's just the extra load of having to start with cold oil, etc in the winter. If it were to start with the throttle plate closed there wouldn't be enough initial flow through the throttle plate to supply the engine with the needed air and fuel to getit started and up to a stable speed. Basically it would be like putting your tractor in gear, blocking the wheels, and trying to start it. You'd never get the engine turning fast enough to gain the needed, initial momentum for the governor to take control and open the throttle plate. When starting with the throttle plate wide open it will provide maximum flow through the plate which allows the engine to gain speed rapidly until the engine gets to the set speed at which point the governor takes control and shuts the throttle plate to restrict the flow and control the speed. This is more or less a simplistic explination of what's happening but I hope it'll give you an idea of why they do it the ay they do.

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Jon H

06-09-2005 20:02:19




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 Re: Question on Governor Operation for you !!! in reply to Way Up Here, 06-09-2005 19:37:51  
A variable speed governor maintain a set engine speed. A limiting speed governor limits the engine to a set maximum speed. In every case I have had experience with,a spring opens the throttle and the governor of either type closes it.



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