Working principle of Cummins generator PTG two-pole governor / speed regulator 1. Idling condition At idle, the throttle is in the closed position and fuel flows only through the idle throttle to the injector. If the rotation speed is reduced for some reason and the centrifugal force of the flying block is reduced, the idle speed spring pushes the governor plunger to the left to increase the cross section of the orifice leading to the idle oil passage, and the oil supply amount increases. When the speed increases, the PTG governor plunger moves to the right, the flow cross section decreases, and the oil supply decreases, thereby keeping the idle speed stable. The idle adjustment screw is used to change the steady speed of the idle speed. 2. High speed condition When the speed of the diesel engine increases, the plunger and idle spring of the PTG governor are compressed, which is mainly acted by the high speed spring. The left notch of the plunger groove of the PTG governor h...
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