In order to achieve these major requirements, modern helicopter engines are equipped with complex automatic control systems and control systems, as well as several independent automatic devices. They may keep any control parameters and setpoints untouched without human intervention, or change any control parameters in the desired manner. The basic characteristics of the helicopter engine control system Modern helicopters are generally equipped with a free turbine turboshaft engine, by controlling the gas generator speed, to control the power turbine speed, and then through the speed control free turbine to meet the helicopter power requirements. The control of the gas generator speed is accomplished by the operation of the turbine fuel controller. In order to guarantee the required power for this speed, the fuel regulator is metered by a free turbine controller and automatically held. This control is continuous, continuously controlling the fuel flow according to the rotational speed, so that the helicopter engine can operate normally as required.
Fuel flow is a function of engine speed compressor outlet pressure and gas generator throttle lever position. By inputting the above parameters affecting the helicopter engine's operation into its fuel control equipment, the fuel flow rate of the fuel nozzle is controlled so that it will not cause the engine to overheat and ablaze the hot parts without causing excessive combustion chamber back pressure. Causes the compressor to surge, and even causes the engine to become rich and flameout, and it does not cause the fuel to turn off due to lack of fuel, so as to ensure the stable operation of the engine. Current Helicopter Engine Control System Hydraulic Mechanical Control System At present, hydraulic machinery control systems are widely used in various countries at home and abroad. Fuel oil is used as the working medium for regulating functions, and the main part is the fuel metering part and the calculation part. The main component of the fuel metering section is the fuel metering valve. The pressure of the fuel is maintained by the valve, and the fuel flow is determined by the opening of the metering valve. The opening of the metering valve is determined by the calculation section and throttle lever position. The function of the calculation section receives signals from the helicopter pilot and the engine and calculates the fuel flow that should be output to the fuel nozzle. If the combustion pressure approaches the limit that causes surge or stall, the calculation section will limit the fuel flow until it matches the increase in air flow.
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