1 / 43

Automotive Ignition Systems

Learn about ignition systems, from creating high voltage sparks to timing ignition for optimal engine performance. Explore primary and secondary circuits, coil operations, distributor functions, and spark plug details. Discover different ignition system types like breaker points, electronic, optical triggers, and direct ignition setups. Get insights on maintenance practices to keep your ignition system running smoothly. Visit HowStuffWorks.com for more details.

arnoldo
Download Presentation

Automotive Ignition Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Automotive Ignition Systems

  2. Ignition System Purpose • Create a high voltage spark • Deliver the spark at correct time

  3. How Stuff Works .com

  4. Ignition Timing • BTDC • ATDC • Engine RPM • Engine Load • Firing Order • Retard • Advance

  5. Firing Order

  6. Firing Order • 1,3,4,2 • 1,2,5,4,3,2 • 1,5,6,3,4,2,7,8

  7. Firing Order

  8. Primary Circuit (Low Voltage) Ignition Switch Resistor Coil Primary Winding Ignition Module Pick-up Assembly Secondary Circuit (High Voltage) Coil Secondary Winding Coil Wire Distributor Cap & Rotor Plug Wires Spark Plugs Ignition System Circuits

  9. Ignition Primary Circuit • Battery • Ignition Switch • Resistor • Coil Winding • Ignition Module • Pick-up Assembly • Low voltage side

  10. Ignition Coils • Step-up transformer • Primary winding • Secondary winding • Uses electro-magnetic induction to operate • Magnetic field must be built up and then collapsed

  11. Ignition Coil • High Voltage wire • + Battery • - ign module • Primary Windings • Secondary Windings

  12. Making & Breaking Fields

  13. Ignition Modules • Old Systems Used Breaker Points • Modules Contain a Switching Transistor • Externally Mounted • Distributor Mounted

  14. Ignition Pick-up Assemblies Can be mounted in one of five different locations: #1 Distributor #2 Vibration Damper #3 Flywheel #4 Crankshaft #5 Camshaft

  15. Distributor • A mechanical timing device • Drives off engine camshaft • Can controls both primary and secondary circuits • May contain advance units

  16. The Rotor at Work • Rotates around to DISTRIBUTE voltage to each spark plug • http://www.howstuffworks.com/ignition-system4.htm

  17. Ignition Secondary Circuit • Coil Winding • Coil Wire • Distributor Cap & Rotor • Spark Plug Wire • Spark Plug

  18. Distributor Cap & Rotor • Cap fits on top of the distributor housing • Made of lexon plastic • Has an index mark for proper installation • Rotor fits on top of distributor shaft • Also is indexed

  19. Spark Plug Wires • Very high resistance wire 1000 ohms per inch • Mostly insulation material • Small conductor material • Must follow firing order

  20. Spark Plug Placement

  21. Spark Plugs • Shell w/threads • Ceramic insulator • Center electrode • Side electrode • Plug gap • Heat range • Plug designation

  22. Resistor Plugs

  23. The difference between a "hot" and a "cold" spark plug is in the shape of the ceramic tip. The difference between a "hot" and a "cold" spark plug is in the shape of the ceramtip. The carmaker will select the right-temperature plug for each car. Some cars with high-performance engines naturally generate more heat, so they need colder plugs. If the spark plug gets too hot, it could ignite the fuel before the spark fires; so it is important to stick with the right type of plug for your car. Heat Rages of Plugs

  24. Spark Plugs tell a story Normal Lead Erossion Insulator Breakage Worn Minor Melting Carbon Fuel/Additive Deposits Over Heating Lead Fouled Lead Fouled Oil

  25. Old Breaker Point Ignition • Used 1920’s - 1974 • mechanical switch in distributor • build-up - collapse coil magnetic field • Points wear out • Must be replaced each year

  26. Breaker Point (dwell angle)

  27. Breaker Point Parts

  28. Making & Collapsing field

  29. Electronic Ignition with Distributor (HEI) • 1970’s • Transistor in ignition module turns coil on/ off • Module mounted externally or in distributor • Pick-up in distributor

  30. High Energy Ignition (HEI)

  31. Trigger Wheel • No Points • Rotating Reluctor Wheel • Fewer Tune-Ups • More Efficient

  32. Optical Trigger (Chrysler) • Photo Electric Sensor • (Photo = Light)

  33. CKPS(crankshaft position sensor) • Fewer Parts • No Points • No Distributor • No Rotor • Computer Controlled • More Efficient

  34. Crank Trigger Wheel

  35. Direct Ignition • No Distributor • One Coil for Two Cylinders • Waste Spark System • One Plug Fires Backwards

  36. Wasted Spark • 1st plug fires forward • 2nd fires backwards • Sister cylinders

  37. Direct Ignition

  38. Coil Over

  39. Business End of the Ignition System • Size • Reach • Heat Range • Spark.Air Gap

  40. Ignition System Maintenance • Replace Spark Plugs every 30,000mi/36mo • Inspect Cap and Rotor (replace if necessary) • Inspect Spark Plug wires (replace if necessary) • Check Firing Order • Check Ignition Timing (if necessary)

  41. Timing • Engine Warm • At Idle • Defeat Advance • #1 Plug wire

More Related