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Integral drive AC generator (IDG).
Mounted on the gearbox is the air turbine starter (ATS).
The N2 rpm is displayed on the EICAS page.
POWER PLANT Description Vol. 2 19.10.3
Oct 05/06
Description
Fuel is delivered to the fuel injectors at pressures and flow rates required to maintain the desired engine thrust. The engine fuel system, in addition to providing fuel for combustion, is used for:
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Controlling and actuating the VG compressor linkage;
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Cooling the engine oil (heat exchange);
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Actuating and lubricating servos within the fuel control unit (FCU); and
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Providing motive flow for the main ejector and scavenge ejector pumps.
Combustion fuel can be interrupted by moving the thrust lever to SHUT OFF, or by selecting the engine FIRE PUSH switch/light. The SHUT OFF position shuts off the fuel at the FCU. The FIRE PUSH switch/light closes the fuel shutoff valve.
Components and Operation
Engine-Driven Fuel Pump
The accessory gearbox-mounted fuel pump is comprised of three separate pumps contained within a single housing. The engine-driven fuel pump provides high-pressure fuel at a flow rate that exceeds the requirements of the engine at any power setting. Fuel pump pressure is used to generate motive flow for the scavenge and main ejectors of the aircraft fuel system.
Fuel/Oil Heat Exchanger and Fuel Filter
A fuel/oil heat exchanger is used to warm engine fuel and cool engine oil. The fuel temperature at the fuel filter is indicated on the SUMMARY page. A fuel filter is used to remove solid contaminants from the fuel. If the filter becomes clogged, the fuel bypasses the filter to ensure continued operation. A clogged filter is indicated by the L (R) FUEL FILTER caution EICAS message.
Fuel Control Unit (FCU)
The fuel control unit is a hydromechanical metering device that supplies fuel in response to mechanical inputs from the thrust levers. In addition, the FCU controls and actuates the VG inlet guide vanes and stator vanes of the engine compressor.
During start and at low power, the FCU hydromechanically schedules the fuel.
POWER PLANT Description Vol. 2 19.10.4
Oct 05/06
Engine Fuel System . Schematic
Figure 19.10.2
POWER PLANT Description Vol. 2 19.10.5
Oct 05/06
Electronic Control Unit (ECU)
When at high thrust settings, the engine is controlled by an electronic control unit (ECU), which works in tandem with the FCU. The ECU is also referred to as the N1 control amplifier. The ECU (or N1 control amplifier) trims the FCU fuel output to maintain a N1 speed schedule for a given thrust lever setting.
Fuel System Operation
N2 Speed Control (N1 <79%)
At low power settings (N1 below 79%), the FCU hydromechanically controls the N2 speed. In N2 mode, the FCU adjusts N2 speed, so that matched movement of the thrust levers produces nearly matched N2 rpm for the engines. N1 speeds, fuel flows, or ITT indications may differ between engines.
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公务机翻译 www.aviation.cn
本文链接地址：庞巴迪挑战者605公务机机组操作手册 CL605-动力装置 POWER_PLANT(3)
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