What does a hydro mechanical unit do?

What does a hydro mechanical unit do?

During normal engine operation, a remotely mounted electronic fuel control unit (EFCU) (same as an EEC) performs the functions of thrust setting, speed governing and acceleration, and deceleration limiting through EFCU outputs to the fuel control assembly in response to power lever inputs.

What are two basic types of turbine engine fuel control units?

Gas turbine engine fuel controls can be divided into three basic groups:

• Hydromechanical.
• Hydromechanical/electronic.
• Full Authority Digital Engine (or Electronics) Control (FADEC)

What engine component regulates fuel to the engine?

In an internal combustion engine, the throttle is a means of controlling an engine’s power by regulating the amount of fuel or air entering the engine. In a motor vehicle the control used by the driver to regulate power is sometimes called the throttle, accelerator, or gas pedal.

What are the two types of fuel nozzles?

Fuel nozzle types There are two types of fuel nozzles on PT6 engines — simplex and duplex.

What is fuel selector valve?

The fuel selector valve allows the pilot to choose which tank is feeding fuel to the engine. Some systems require you to alternate between Left and Right tanks, while others offer a Both position.

What are the two condition for efficient fuel system?

Carburettor with pump feed to fuel reservoir Diaphragm type fuel pump Page 4 AG ENGG 243 Lecture 6 4 Two conditions are essential for efficient operation of fuel system: (i) The fuel oil should be clean, free from water, suspended dirt, sand or other foreign matter, (ii) The fuel injection pump should create proper …

What are the different types of fuel nozzle?

Fuel nozzle types There are two types of fuel nozzles on PT6 engines — simplex and duplex. With simplex fuel nozzles, you have two different nozzles — primary and secondary. Each nozzle has a single orifice.

What is fuel nozzle?

The pressure-atomizing unit that receives fuel under high pressure from the fuel manifold and delivers it to the combustor in a highly atomized, and precisely patterned spray. …

How does a hydromechanical fuel control system work?

Fuel controls have two sections, computing and metering, to provide the correct fuel flow for the engine. A pure hydromechanical fuel control has no electronic interface assisting in computing or metering the fuel flow.

How are hydromechanical controls used in turbine engines?

Early electronic controls used a hydromechanical control with an electronic system added on the system to fine tune the metering of the fuel. This arrangement also used the hydromechanical system as a backup if the electronic system failed. [Figure 2-49] Figure 2-49.

Where is the fuel control unit on a turbine engine?

This fuel control unit is sometimes mounted on the vane fuel pump assembly. It provides the power lever connection and the fuel shutoff function. The unit provides mechanical overspeed protection for the gas generator spool during normal (automatic mode) engine operation. In automatic mode, the EEC is in control of metering the fuel.

How did early electronic fuel control systems work?

Early electronic controls used a hydromechanical control with an electronic system added on the system to fine tune the metering of the fuel. This arrangement also used the hydromechanical system as a backup if the electronic system failed. [Figure 1] Figure 1. Fuel control assembly schematic hydomechanical/electronic