American Society of Agricultural and Biological Engineers

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CHAPTER 8 Ignition Circuits

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Chapter 8, Pages 183-202 (doi:10.13031/2013.24143) in Chapter 8 in Engine and Tractor Power, 4th edition. St. Joseph, Michigan: ASAE. . Copyright 2004 American Society of Agricultural and Biological Engineers, St. Joseph, Mich.
Authors:   Carroll E. Goering and Alan C. Hansen
Keywords:   Mutual Induction, Kettering Ignition Systems, Transistor-Assisted Kettering Ignition Systems, Inductive-Type Electronic Ignition Systems, Integrated Electronic Ignition Systems, Magneto Ignition Systems, Capacitive-Discharge Ignition Systems, Battery-Powered Systems, Capacitive-Discharge Systems for Small Engines, Spark Plugs, Microprocessor Control in Automotive Vehicles

Spark-ignited engines require a spark to initiate burning of the air-fuel mixture in the combustion chamber. The spark in each cylinder is provided by a spark plug and is actually a flow of electrical current through the air and fuel vapor between the closely spaced electrodes of the spark plug. The resistance of air is very high. Therefore, a 15,000- to 30,000-V potential across the gap is used to fire the plug. Typically, the ignition system must supply this high voltage from a 12-V storage battery. Moreover, the spark must begin at the proper point in the cycle and must be of sufficient duration.

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