Diesel Engine FundamentalsDOE-HDBK-1018/1-93DIESEL ENGINE SPEED,FUEL CONTROLS, AND PROTECTIONSimplifiedOperationof the GovernorThe governor controls the fuel rack position through a combined action of the hydraulicpiston and a set of mechanical flyweights, which are driven by the engine blower shaft.Figure 28 provides an illustration of a functional diagram of a mechanical-hydraulicgovernor. The position of the flyweights is determined by the speed of the engine. Asthe engine speeds up or down, the weights move in or out. The movement of theflyweights, due to a change in engine speed, moves a small piston (pilot valve) in thegovernor's hydraulic system. This motion adjusts flow of hydraulic fluid to a largehydraulic piston (servo-motor piston). The large hydraulic piston is linked to the fuelrack and its motion resets the fuel rack for increased/decreased fuel.Figure 28 Simplified Mechanical-Hydraulic GovernorRev. 0ME-01Page 35
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