How Governing Of IC Engines Works ? Methods For The Governing Of I.C Engines ?

Governor is a mechanical device which is used to regulate the mean speed of the engine, when there are variations in the load.During increase in load, RPM of the engine decreases and it leads to slowing of engine.Now in this case Governor in order to maintain the speed, increase fuel supply to engine, so that speed can be attained to the desired value.But when load on engine increase, then it tends speed up and in this case Governor reduces the supply of fuel to maintain the desired RPM.

Though there are many methods for the governing of I.C. engines, yet the following are important :


1. Hit and miss Governing :-
In this system of governing, whenever the engine starts running at higher speed (due to decreased load), some explosions are omitted or missed. This is done with the help of a centrifugal governor. This method of governing is widely used for I. C. engines of smaller capacity or gas engines.

2. Qualitative Governing:- 
In this system of governing, a control valve is fitted in the fuel delivery pipe, which controls the quantity of fuel to be mixed in the charge. The movement of control valve is regulated by the centrifugal governor through rack and pinion arrangement.

3. Quantitative Governing :-
In this system of Governing, the quality of charge (i.e. air-fuel ratio of the mixture) is kept constant. But the quantity of mixture supplied to the engine cylinder is varied by means of a throttle valve which is regulated by the centrifugal governor through rack and pinion arrangement.


4. Combination system of Governing:- 
In this system of Governing, the qualitative and quantitative methods of governing are combined together.