Study Unit – Ignition System Components and Operation PDF

Study Unit - Ignition System Components and Operation PDF

Study Unit – Ignition System Components and Operation PDF Free Download

In your previous study units, you learned about the components of an engine and how they affect engine operation. You also learned about automotive lubrication and cooling systems. In this study unit, you’ll learn how an engine’s ignition system operates. An engine’s ignition system generates the high voltage needed to make a spark plug fire. The sparks from the spark plugs ignite the air-and-fuel mixture in the engine’s cylinders and start the engine.

When you complete this study unit, you’ll be able to

  • Explain the difference between voltage, current, and resistance in a circuit
  • Describe how a spark plug is constructed and how it operates
  • Identify the components used in conventional and electronic ignition systems
  • Describe the operation of spark-advance mechanisms
  • Explain the operation of direct-fire ignition systems

INTRODUCTION TO ELECTRICITY
A Simple Circuit
Conductors and Insulators
Current, Voltage, and Resistance
DC and AC Voltage and Current
The Relationship Between Current, Voltage, and Resistance
Measuring Electrical Quantities
Electromagnetism
INTRODUCTION TO IGNITION SYSTEM OPERATION
An Overview of Operation
The Battery
The Ignition Switch
The Ignition Coil
Triggering Devices
Spark Plug Wires
Spark Plugs
Firing Order
The Distributor
Review of Ignition System Operation
TRIGGERING IN CONVENTIONAL IGNITION SYSTEMS
Point-type Triggering Devices
The Contact Points
The Condenser
Primary-current Resistor
The Point Gap
The Dwell
TRIGGERING IN ELECTRONIC IGNITION SYSTEMS
Magnetic-pickup Triggering Devices
Hall-effect Triggering Devices
Optical Triggering Devices
IGNITION TIMING IN DISTRIBUTOR-TYPE IGNITION SYSTEMS
Initial Timing
Precision Timing
Spark-advance Mechanisms
Timing in Electronic Ignition Systems
DIRECT-FIRE IGNITION SYSTEMS
Introduction
The Crankshaft Position Sensor
The Trigger Wheel
The Camshaft Position Sensor
Ignition Coils in Direct-fire Systems
Waste Sparks
Ignition Timing in Direct-fire Systems
Timing Control in Direct-fire Systems
Actual Direct-fire Examples
SUMMARY
POWER CHECK ANSWERS
EXAMINATION

Language: English
File: PDF
Size: 2.66 Mb
Free download Study Unit – Ignition System Components and Operation PDF
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