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The fuel control system includes a low power sensitive torque motor which may be activated to increase or decrease fuel flow in the automatic mode (EFCU mode).
#RC FUEL PUMP FOR GAS ENGINES MANUAL#
Deenergizing the manual mode valve enables the mechanical speed governor to function as an all speed governor in response to power lever angle (PLA). It is restricted to a single overspeed governor setting above the speed range controlled electronically.
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The automatic mode restricts operation of the mechanical speed governor. The manual mode solenoid valve is energized in the automatic mode. Fuel pressure differential across the servo valve is maintained by the servo-operated bypass valve in response to commands from the EFCU. It is a fuel flow/compressor discharge pressure (Wf/P3) ratio device that positions the metering valve in response to engine compressor discharge pressure (P3).
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The hydromechanical fuel control assembly provides the fuel metering function of the EFCU.Fuel is supplied to the fuel control through a 200-micron inlet filter screen and is metered to the engine by the servo-operated metering valve. This arrangement also used the hydromechanical system as a backup if the electronic system failed. Early electronic controls used a hydromechanical control with an electronic system added on the system to fine tune the metering of the fuel. Electronic controls can receive more inputs with greater accuracy than hydromechanical controls. Actual operating procedures for a hydromechanical fuel control is very complicated and still the fuel metering is not as accurate as with an electronic type of interface or control. Once the computing section determines the correct amount of fuel flow, the metering section through cams and servo valves delivers the fuel to the engine fuel system. Other mechanical engine parameters that are sensed are compressor discharge pressure, burner pressure, exhaust temperature, and inlet air temperature and pressure.
#RC FUEL PUMP FOR GAS ENGINES GENERATOR#
It also is generally driven by the gas generator gear train of the engine to sense engine speed. A pure hydromechanical fuel control has no electronic interface assisting in computing or metering the fuel flow. Fuel controls have two sections, computing and metering, to provide the correct fuel flow for the engine.