During operation, characteristics of internal combustion engines should not change. To avoid changes, governors have been used. There are mainly 4 types of governors-mechanical, hydraulic, pneumatic and electronic. The principle of mechanical governors is based on the in centrifugal force with rotational speed. It consists of a fuel control valve, two springs- maximum speed spring and idling spring, fuel control rack, sleeve, ball, pivot, spindle and adjusting levers. Hydraulic governor use a hydraulic servo, fuel control valve, input and floating levers and a power piston. In pneumatic governors, a change in the inlet manifold pressure due to change in speed governor is used to control the fuel control valve, changing the fuel delivery to control the speed to the desired value. Electronic governors use electrical and electronic components.
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