Sheet- Ignition System

Minia University Faculty of Engineering

Automotive & Tractor Eng. Dept November, 2013

Elective course ( 3 ) Code: AT 419

1 | P a g e

Attempt to answer ALL Questions

sgnition SystemI

1. Explain the operating principles of an automotive conventional ignition system

2. Describe the parts of an automotive ignition system

3. Explain the function of an automotive ignition system’s secondary wires

4. Explain the function of an automotive ignition system’s primary wires

5. Explain the construction of various automotive ignition coil designs

6. Define the term “ignition dwell”

7. Explain how a Hall effect chip operates

8. Describe the evolution of ignition timing advance systems

9. Explain the operation and function of an ignition system’s electronic control unit

10. Describe the operation of direct ignition system

11. Sketch the basic parts of an automotive ignition system.

12. How is a spark plug’s heat range indicated?

13. Describe the basic construction of a modern automotive ignition coil.

14. Explain the function of an automotive distributor rotor.

15. How does a trigger wheel and pickup coil ignition system operate?

16. Describe the functions of a modern ignition system’s electronic control unit.

17. Explain how a distributorless ignition system operates.

18. How do most modern ignition systems control timing advance?

19. What is the purpose of an automotive ignition system?

20. Compare and contrast early and modern distributors.

21. Why do certain spark plugs contain resistors?

22. Define the term “spark plug reach.”

23. Describe the function of an ignition coil.

24. Explain the purpose of secondary wires.

25. Where an ignition system is ECU normally located?

26. Define the term “true spark.”

27. Explain how early centrifugal advance mechanisms operate.

28. Describe the basic operation of a direct ignition system.

29. Describe the basic operation of a contact breaker switched ignition system.

30. Describe the basic purpose of ignition timing point setting/advance with regard to engine

speed and load.

31. Explain how can Refit the High Tension leads in the correct firing order.

32. How can Test the electrical resistance of an ignition coil.

33. Draw a block circuit diagram of a basic electronic ignition system that uses a distributor

based signal generator (pickup).

34. Describe the function of the Inductive and Hall type signal generators (pickups) in an

electronically controlled ignition system.

35. Describe the function, basic operating and test principles of the amplifier/switching unit in

Inductive and Hall effect electronic ignition systems.

36. Describing the Hall effect, operation of an inductive pick up module and an optical pulse

generator.

37. Describing the use of control modules.




2 | P a g e

There are three general types of ignition system: breaker ignition; electronic ignition;

and direct ignition:

1- Explain the difference between them

2- What are the main components of each?

3- Explain ignition advance and ignition retard.

4- Describe the requirements of an ignition system of a SI engine.

5- List different type of ignition system. Describe the working of battery ignition system with

the help of a suitable diagram.

6- Draw a neat sketch of magneto ignition system and explain its working.

7- List various advantages and disadvantages of battery ignition system.

8- Describe in brief the function of a distributor.

9- Describe in brief the functions of the following components of an ignition system:

Condenser, Spark plugs and Ignition switch.

10- What are different effects of ignition retard on the performance of an automobile?

11- What happens to the performance of a vehicle due to ignition advance?

12- How does centrifugal advance mechanism works?

13- What is the working principle of vacuum advance mechanism?

14- What do you mean by battery capacity? What is the requirement of a good spark plug?

15- What type of tests which can be conducted on the battery for testing?

16- How servicing of ignition system should be done?

17- Draw a wiring diagram showing the primary and secondary ignition systems.

18- What are the Primary ignition system components?

19- Measure and record the resistances of the primary and secondary coil windings of the

ignition coil.

20- The ignition system controls the ignition timing in accordance with the engine speed and

load so that the maximum combustion force occurs at 10 °ATDC. Discuss with neat sketch.




3 | P a g e

Ignition System Quick Quiz

1- If you hear the term “Smart Ignition System” what is this referring to?

itself for thinks that System Ignition An

System Ignition Controlled Computer

controlled computer-non is that System Ignition An

2- How do you measure the secondary resistance of an Ignition Coil?

terminals Primary the of one and tower coil the crossa meter Ohm an Use

terminals Primary two the across meter ohm an Use

terminals Primary the of one and tower Coil the across meter volt the Use

3- What is the typical amplification factor between the Primary and Secondary

windings of the coil?

1 to 10

1 to 100

1 to 1000

1 to 10000

4- What does a number on a Spark Plug represent?

threads the of length The

porcelain the of length The

range heat The

5- What is the main function of the Ignition Control Module?

timing the Control

Injectors Fuel the Control

Spark the Control

shifting transmission Control




4 | P a g e

Choose the answer that BEST completes the following statements or

questions.

1) ____________ refers to the precise moment a spark plug fires in relation to the position of

a piston in the cylinder. Less power will be produced the earlier the spark event occurs.

A) Ignition rpm

B) Ignition timing

C) Ignition sequence

D) Ignition spark

2) The __________ of a spark plug contributes to the resistance of the ignition secondary

circuit and determines how much gasoline is ionized when the spark plug fires.

A) resistance area

B) laminate

C) magnetic force

D) air gap

3) Which of the following ignition system configurations are commonly found on OBD II

compliant engines?

A) Hall Effect, Optical, breaker point, fast start

B) Direct ignition, electronic ignition, TIF

C) Distributorless Ignition Systems (DIS), coil near plug, Coil-Over-Plug (COP)

D) None of the above

5) Some EI systems are called fast start systems because the spark plugs begin firing within

_______ degrees of crankshaft rotation.

A) 60

B) 120

C) 180

D) 360

6) When using a digital voltmeter to check a two-wire crankshaft or camshaft sensor signal

there are three aspects to measure, they include:

A) Amperage, amplitude, frequency

B) Duty cycle, frequency, resistance

C) A/C voltage, frequency, resistance

D) DC voltage, frequency, resistance

7) Spark duration is measured in:

A) milliseconds

B) milliamps

C) millivolts




5 | P a g e

D) milliohms

8) When diagnosing ignition problems, trace patterns of the ignition oscilloscope can be

divided into three main zones or sections: the firing section, the intermediate section and the

_________.

A) spark section

B) dwell section

C) raster pattern

D) timing pattern

9) Ignition systems on OBD II compliant vehicles has two main electrical circuits, the:

A) inductive and reluctive circuits

B) high energy and low energy circuits

C) input and output circuits

D) primary and secondary circuits

10) ______________ is produced when electromagnetic radio waves of sufficient amplitude

escape from a spark plug wire or conductor?

A) Capacitive discharge

B) Resistor interference

C) Spark triggering

D) Electromagnetic interference

11. An ignition system changes ____ into very high voltage and then sends the high voltage

to the spark plug.

a. low input signals

b. high input signals

c. high battery voltage

d. low battery voltage

12. Many older engines use a _____ to direct high voltage to the spark plug wire. Newer

models use a _____ instead.

a. VOM; relay and electronic control unit (ECU)

b. transformer; distributor

c. coil; ECU

d. distributor; computer and ECU

13. Automotive spark plugs screw into holes machined into the engine _____.

a. intake manifold

b. fuel rail

c. cylinder head

d. short block




6 | P a g e

14. If spark plug reach is too long, the piston can strike the plug tip and _____.

a. misfire

b. cause major engine damage

c. short out the system

15. The spark plug wire and coil wires are classified as secondary wires. Most new cars use

a(n) _____ wire that prevents radio interference.

a. routing

b. electric

c. electronic suppression

d. fire

16. True or False? Many cars now mount the ignition coil directly on the engine above the

spark plugs, eliminating secondary wires.

17. Older cars often feature a Unitized Ignition System in which the ignition coil mounts

inside_____.

a. the engine

b. the top of the distributor cap

c. the battery

d. the coil pack

18. The distributor cap is a plastic cover that fits over the top of the distributor body to hold

the_____.

a. primary wires

b. distributor gear

c. distributor rotor

d. secondary wires

19. A _____ and special _____ secure the distributor into the top of the engine.

a. bolt; clamp

b. nut; pin

c. pin; nut

d. clamp; nut

20. Which of the following is another name for the ignition system’s ECU?

a. ignition amplifier

b. integrated computer

c. DC controller

d. (all of these)

21. The ignition system’s ECU is used to convert an AC _____ wave into a _____ wave,

which is then sent to the automobile’s computer.

a. square; sine

b. sine; square

c. cosine; square




7 | P a g e

d. square; cosine

22. In a distributorless ignition system, the _____ and a coil control unit are used to fire the

ignition coils.

a. reluctor

b. computer

c. relay

d. condenser

23. In a distributorless ignition system, the _____ are often the main inputs going to the ECU

and computer.

a. secondary wires

b. coil packs

c. crank sensor and cam sensor

24. With a direct ignition system, one small _____ is used for each cylinder or spark plug.

a. sensor

b. ignition coil

c. switch

d. reluctor

25. The term _____ refers to the amount of time that primary current is flowing through the

ignition coil.

a. advance

b. pick-up

c. persistence

d. dwell




8 | P a g e

The primary (low-voltage) ignition system must be working correctly

before any spark occurs from a coil. Which component is not in the

primary ignition circuit?

Spark plug wiring

Ignition module (igniter)

Pickup coil (pulse alternator)

Ignition switch

The ignition module has direct control over the firing of the coil(s) of an

ignition system. Which component(s) triggers (controls) the module?

Pickup coil

Computer

Crankshaft sensor

All of the above

Distributor ignition systems can be triggered by a ________.

Hall-effect sensor

Magnetic sensor

Spark sensor

Either a or b

Ignition coil primary resistance is usually ________ ohms.

6,000 to 30,000

150 to 1,500

Less than 1 to 3

Zero

Coil polarity is determined by the ________.

Direction of rotation of the coil windings




9 | P a g e

Turn ratio

Direction of laminations

Saturation direction

A compression-sensing ignition system uses a ________ type of ignition.

Distributor

Coil on plug

Waste spark

All of the above

The pulse generator ________.

Fires the spark plug directly

Signals the electronic control unit (module)

Signals the computer that fires the spark plug directly

Is used as a tachometer reference signal by the computer and has no

other function

Two technicians are discussing coil-on-plug ignition systems. Technician A

says that they can be called coil-near-plug or coil-by-plug ignition systems.

Technician B says that some can use ion sensing. Which technician is

correct?

Technician A only

Technician B only

Both Technicians A and B

Neither Technician A nor B

A waste-spark-type ignition system fires ________.

Two spark plugs at the same time

One spark plug with reverse polarity

One spark plug with straight polarity




11 | P a g e

All of the above

Technician A says that a defective crankshaft position sensor can cause a

no-spark condition. Technician B says that a faulty ignition control module

can cause a no-spark condition. Which technician is correct?

Technician A only

Technician B only

Both Technicians A and B

Neither Technician A nor B

With my best wishes Dr. Nouby M. Ghazaly

Sheet- Ignition System

Documents

Transcript of Sheet- Ignition System