Spark Ignition - Searching for the Optimal Spark Profile

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Sammanfattning

The impact of different spark designs on the ignition and combustion
stability is studied using a 13-liter CNG fueled heavy duty spark ignited engine
to search for the “optimal” spark design. Experimental results show that robust
ignition can be achieved using a significantly shorter spark duration and lower
energy than expected. A capacitive discharge ignition (CDI) system enabled to
separately control the available spark voltage, current and duration (FlexiSpark®
CDI) was compared to a standard CDI system without spark control and an inductive discharge (IDI) ignition system. Typically, a robust ignition can be provided using only 5% of the spark duration and 17% of the spark energy compared to that required by an IDI system to accomplish an equivalent ignition and combustion stability. By applying control of the spark, a robust ignition can be provided which is optimized for the fuel, the engine design, the engine operating condition, and the condition of the spark plugs. This offers a potential to significantly reduce the spark-plug wear and the total cost of ownership without compromising engine performance.

The results are especially interesting in the view of Hydrogen fueled SI-ICE, where the required available spark voltage is high, but the required spark energy is low. It is desirable to use a spark design with just enough voltage and power to initiate a sustainable combustion, but with minimal energy not to excessively wear and heat the spark plug electrodes to avoid pre-ignition.
Originalspråkengelska
Titel på värdpublikation9th International Engine Congress 2022
Sidor1-17
Antal sidor18
StatusAccepted/In press - 2022
Evenemang9th International Engine Congress - Baden Baden, Tyskland
Varaktighet: 2022 feb. 222022 feb. 23

Konferens

Konferens9th International Engine Congress
Land/TerritoriumTyskland
OrtBaden Baden
Period2022/02/222022/02/23

Ämnesklassifikation (UKÄ)

  • Farkostteknik
  • Energiteknik

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