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A/C Engine Starting Simulation System

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Rami Hanna

on 24 June 2014

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Transcript of A/C Engine Starting Simulation System

A/C Engine Starting Simulation
Engine Starters

Design and Realization of Aircraft Engine Starting System Using PLC
Engine starters
A/C Components
A/C Operations
Simulation Model Design
PLC Programming
Practical realization
Project Target
Why Practical Realization?
Maximum transfer of training Provide students with practice tools
Circuit Wiring
Why Air Turbine Starter Unit ?
In a turbine engine, the starter must turn the engine up to a speed that provides enough airflow to the engine for fuel to be ignited.
Designing a system to simulate controls & operations of Air Turbine Starter Unit of A/C Engine.
Our Target:
Creating a practical Realization for a simulated system to be used in Educational proposes.
Why Simulation?
• Improves the quality of training
• Offers multiple financial benefits:
• Assistant for troubleshooting A/C systems
• Provides just-in-time training
• Provides an effective training tool for understanding complex systems
– Direct cost savings
– Indirect cost savings
– Increased throughput
Enhance classroom training as an instructor aid instead of chalk and talk
Incorporate self-paced learning modules for knowledge and skills
Practical Realization
Stage 1:
System at initiation:
Stage 2:
System at 0% -> 16 % RPM:
The Engine starting system is one of the most important system in Aircraft.

After studying the system operation and control, it is required to design a ladder diagram to operate and control the engine starting system through the PLC device.

A practical Realization for a simulated starting system should be performed to be used as a teaching aid in the laboratories

Any Questions
The Jet Engine, Rolls Royce.
Simulation based Aviation Training.
Siemens PLC Guide.
Then, the starter must continue to help the engine accelerate to a self-sustaining speed.
starter unit consists of :
The air for driving the starter can be supplied by:
Speed-sensitive control function:
- At > 16 % RPM:
The ignition relay is energized.

The fuel shutoff valve is energized.

The Enrichment valve energized.

The engine fuel in parallel operation
- At > 94 % RPM:

A/C engine attains ideal RPM

starter operation cuts out.
- At 65 % RPM:

Ignition system is de-energized.

Fuel paralleling valve switch to series operation.
Speed-sensitive control function:
Speed-sensitive control function:
System Inputs:
IN1. Fire Emergency Handle.
IN2. Speed 00% - 16% RPM via A/D
converter circuit
IN3. Speed 16% - 65% RPM via A/D
converter circuit
IN4. Speed 65% - 94% RPM via A/D
converter circuit
IN5. A/C ON-Ground S/W
IN6. Pressure > 50 PSI S/W
IN7. Feather Handle.
IN9. Temperature Datum.
System Outputs:
Position switch
Pull Switch
Circuit Breakers
AC Motor
System Components
Analog to Digital converter circuit
Lever for A/C Ground Conditon
Pilot LED Lamps
A/C Engine starting component
Presentation Made by:
Ramy Gendy

PLC Structure
Analog vs discreet module
Analog modules use words to represent the state of a device. An analog signal represents a value.
Discrete modules use only a single bit to represent the state of the device.
Discrete modules are also known as Digital modules.
Every PLC has associated programming software that allows the user to enter a program into the PLC.
Different products may require different software: PLC5, SLC, and Control Logic.
PLC programming
The most popular language used to program a PLC is ladder logic.
Ladder Diagram
The programmer develops the program, and connects their personal computer to the PLC through a network or cable and then downloads the program to the PLC.

Aircraft engine starting has been a hard and important process since the first aircraft.
OUT01. Three stage Flasher LED.
OUT02. Fuel Shutoff Valve LED.
OUT03. Ignition Valve LED.
OUT04. Fuel Enrichment Valve LED.
OUT05. Starter Control Valve LED.
OUT06. Temperature Datum Alarm LED.
OUT07. Feather LED.
OUT08. Alarm LED.
OUT09. Pressure > 50 PSI LED.
OUT10. Fuel Paralleling Valve LED.
OUT11. Fire Handle LED.
OUT12. A/C ON Ground LED.
- At < 16 % RPM:
High pressure airflow drive starter rotor providing initial movement to the engine drive shaft

The fuel shutoff valve is de-energized.

The ignition relay is de-energized
Speed-sensitive control function:
Output Relay of a PLC
Stage 3:
System at 16% -> 65 % RPM:
Stage 3:
System at 65% -> 94 % RPM:
Temperature Datum OFF
more than 50 PSI
An example for a PLC program :
When I press start push button , a motor will run , green lamp will turn on ,a red lamp will turn off , when I press stop push button , the motor will stop , the green lamp will be turned off , and the red lamp will be on

In this example I have two inputs as following
I1 start push button (N.O)
I2 stop push button (N.C)
And I have three outputs as following
Q1 Motor relay
Q2 Green lamp relay
Q3 Red lamp relay
The Function block diagram will be the following :
With ladder diagram will be the following :
220V AC
After studying the system operation and control, the ladder diagram is made to perform a real time simulation, operation and control on the engine starting system through the PLC device.
The practical realization for a simulated starting system is performed.
The realized system can be used for:
Understanding the sequence of starting.
Testing all Possible of Starting failure.
Present successful sequences for aircraft starting to avoid failure of the system.
Teaching aid in simulation laboratories and workshops.
Full transcript