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Smart Plug for Combustion Control in Gasoline Engines and Misfiring and Knock Detection
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
A new generation of spark plugs has been developed to produce an ion current signal needed for the control of the combustion process and achieve the production goals of reduced emissions, and improved engine performance and fuel economy. A unique feature of the smart plug is its ability to develop a complete ion current signal and accurately identify the start of combustion. This is not the case for the conventional spark plug where the start of combustion cannot be determined from the ion current signal because its early part is completely overshadowed by the strong electromagnetic field produced by the spark ignition system. The paper describes the construction of the smart plug and compares between its ion current signal and that produced by the conventional spark plug. In addition, a comparison is made between the smart plug and the pressure transducer in the detection of misfire and engine knock.