I've been wondering for a while now, how governors differ from automotive applications to ag/industrial applications. What's the difference between a min/max governor and a variable speed governor?

Also, how does this relate to different pumps (VE's, P-Pumps, A pumps...)?

Thanks in advance

 

From what I've read/learned an agriculture governor works off of a butterfly(throttle) valve in the intake and an vacuum/pressure actuated diaphragm leading away from the intake by a line to the pump. With the valve closing off the supply of air(closed position), it makes a suction on the diaphragm and pulls the fuel control rack to the decrease fuel position. With the throttle wide open(WOT), it puts pressure into the diaphragm and expands it to the full fuel position. Of course however, there is a point where this diaphragm balances out so as to not add a constant overload of fuel. This balance is done by the incoming air and ability of your engine to disperse that immediate increase or loss of airflow.

Mike

 

I've never touched an Ag machine.....ever. but that sounds like you've described a natural gas or LPG engine. diesel engines have no way of controling air flow during normal operation. only diesel fuel is metered in a diesel engine.

Limiting speed governor- "min max" AKA automotive style governor. maintains minimum and maximum engine speeds. operator input maintains all levels in between.

Variable speed governor- the operator sets a pre-selected engine speed the governor maintains designated engine speed vs load. Used mainly in offroad equipment.

Constant speed governor- isochronous governor- used in genset applications where zero speed droop is required to maintain the integrity of the generator and loads.

 

Thanks for the descriptions

 

i have a 6 cylinder diesel in a cj 10 that has a butterfy in the intake tract. as i understand it, it is part of the govener assembly.

 

What the make and model? I'd be intersted to see it, have any pics. is it actually connected to the throttle linkage? natural gas compressors use that type of throttleing action. I've never heard of it useing diesel fuel.

 

i belive it is a nissan diesel, 1986 model jeep cj10. air port tug, killer low geared t case a full width rear axle with 4.88s and a detroit locker.

 

The only diesel I've personally seen with the butterfly type throttle is a mercedes diesel in a 1958 401 unimog. Had a line running over to the pump, which probably only had a high speed limiting governor.