Fuel Injection Flashcards
What are some advantages of fuel injection
Better control of fuel economy and fuel evaporation
Evenly distributes fuel
Eliminating carburetor ice
What are the two types of fuel injection
Direct injection
Continuous-flow
What are the two types of continuous flow fuel injection systems
Precision air motive
Teledyne-continental
What’s the components of the rsa injection systems
Venturi housing
Fuel metering unit
Fuel regulator
Flow divider and fuel nozzels
How does the idle valve operate based off the throttle valve
It is linked to the throttle valve allowing the idle valve to open at the same time as the throttle valve
What is used in the fuel metering unit in the Mixture control valve to control flow
Valve plate
How does a fuel regulator regulate fuel
Uses the air by the air metering unit and the fuel metering force developed by the ball valve allowing the scheduling flow of fuel
What components are key when opening the fuel regulator system and can become cracked of flawed
Diaphragms
The fuel required for idling is supplied by what
The constant head idle spring or C.H.I.S
What is used to smoothly transfer from idle speeds to cruise speeds
Constant effort spring
What is the key component in the automatic mixture control
Bellows
How does a automatic mixture control work
It controls based of the pressure difference across the air diaphragms
Where is a flow divider is located
Usually located on the top of the engine
What type of tubing is used on flow dividers tubing
Stainless stell
What type of measurement does the instrument go by
It reads in gallons per hour
Where are the fuel nozzles located on an aircraft
They are threaded into each cylinder
Fuel nozzles can also be classified as
Air bleed type nozzles
How can u identify fuel nozzles
A stamped letter on the nozzle body
How is the idle speed get adjusted
By an idle speed screw
Teledyne continental injection system use what type of metering force
Fuel metering
What are the basic components to the teledyne continental injection system
Engine driven pump
Fuel/air control unit
Fuel manifold valve
Injector nozzles
How does the air get out of the fuel in the injector pump
By swirling the air
What is the components in the fuel- air control unit
Mixture control
Main metering jet
Throttle valve
What does the direct link between the fuel and throttle mixture allow for
Proportional increase/ decrease of fuel to the manifold valve
What is the component that helps with the dispersement of fuel to the cylinders
The manifold valve
Why is the vent never pointed tword the front of the engine
If it was the air pressure would be to great and no fuel would be allowed into the cylinders
What components make up the manifold valve
Diaphragm Screen Calibrated spring Fuel inlet Outlet to nozzles Cut off valve Poppet valve
What are mechanics limited to when working on rsa or teledyne continental injection systems
Cleaning nozzles
Field adjustments
Low fuel pressure
High fuel pressure
How do you clean injector nozzles
By soaking them in a suitable solvent and inspecting for clogged orifices
What are the things that need to be inspected for fuel systems
Exterior fuel leaks Fuel pressure checks and adjustments Identical fuel flow across nozzles Engine control travels Idle speed and mixture
What are the two air metering forces on a pressure carburetor
Venturi pressure
Impact air
Where is fuel held constant pressure on a pressure carburetor
The discharge valve
Jet A-1 is a what type fuel
High grade kerosene
Jet B is what type of fuel
Kerosene/Gasoline Mixture
What is the anti-microbial and anti freeze
Prist
How does the FCU schedules fuel
Based off adding/ removing heat energy
What is the perfect air-fuel mixture
15:1
Fuel is mixed with approximately what percent of the total primary air
25%
What does the FCU control
Acceleration and Deceleration rates
What does the FCU monitor
Power Lever position Inlet air temperature and/ or pressure Compressor speed Burner air pressure Turbine inlet temp
What are the different type of fuel control units
Hydro mechanical
Hydro pneumatic
What are the types of electronic engine controls
Supervisory Electronic Engine Control
Full authority digital engine control
Describe how hydro mechanical connection helps piolets
The operator had a direct connection to the FCU
How is the power lever control the fuel flow on a turbine engine
The power lever is connected to the speeder spring
How does the engine flyweights operate on the FCU
It senses the engine speed and then helps by regulating fuel and the weights will either go in or out based on speed
What is the three types of speeds the fly weights can be at
Under speed
On speed
Over speed
What are used to control acceleration and deceleration in a hydro mechanical FCU
Differential relief valve
Burner pressure sensor
What are the differences of a hydro pneumatic system
Utilizes the air pressure sensing system.
How does it work with the propeller
They are interconnected to the engine and FCU control unit
What are the two types of electronic engine control systems
Supervisory EEC
Full authority digital engine control
What system is on the hydro mechanical system
Supervisory EEC
How does the supervisory EEC
They sense based off engine operating parameters and schedules. It compensates for variation in flight conditions to reduce pilot workload. Prevents engine exceedances.
What does the basic fuel injection fuel system include
Fuel storage tanks Shut off and selector valves Boost/auxiliary pumps and engine driven pumps Filters/ screens and low point drains Fuel heat exchangers
What are the two types of fuel nozzles In fuel injection
Vaporizing
Atomizing
How does the fire light in all canisters
It lights by a flame propaganda tubing
How does atomizing fuel nozzles work
Utilize high pressure fuel and specifically sized discharge orifices to produce the spray patter
What are the two types of atomizing fuel nozzles
Simplex
Duplex
How does duplex fuel injectors work
By having a primary and secondary fuel inlet and the primary is for starting and secondary is for above Cruising idle speed
What does the pressurization and dump valve work
Supply fuel to manifold and nozzles at the correct pressure for starting and running spray patterns
Dump the fuel from the nozzles and manifold to aid in rapid engine shut down and to prevent fuel from evaporating in a hot combustion chamber
