Investigating the Cause of Initial Pre-ignition - A New Approach

Volz, Ina; Pfeil, Jürgen; Koch, Thomas; Altenschmidt, Frank

doi:10.1007/978-3-319-69760-4_3

Cited by 1 publication

(1 citation statement)

References 19 publications

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“…Optical investigation by Iwatsuka et al 3 showed that auto-ignition occurs from the insulator tip of the spark plug under high engine speed. Volz et al 4 confirmed that surface ignition occurred on the surface of a glow plug heated at 700 ºC with n-heptane/air pre-mixture under high pressure (45 bar) in the combustion vessel. Dohler and Schaffner 5 investigated the temperature of spark plug and exhaust valve by infra-red measurement and showed that the temperature of both components increased as the engine speed increased.…”

Section: Introductionmentioning

confidence: 93%

Pre-ignition-prevention control method in spark-ignition engines by detecting precursory cycles with an ion-current sensor

Kumano

Kimura

Akagi

et al. 2023

International Journal of Engine Research

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In gasoline engines with a higher compression ratio, abnormal combustion, such as pre-ignition and knocking, tends to occur due to higher temperature in the combustion chamber, which leads to lower engine performance. To prevent pre-ignition from occurring, we propose a pre-ignition-prevention control method that involves using an ion-current sensor integrated in an ignition system. The pre-ignition and precursory cycles are detected from the ion-current intensity and spark-discharge duration estimated from ion-current signals. Fuel-injection is increased to cool the mixture in the combustion chamber after the abnormal combustion (precursory) cycle is detected. In a commercial gasoline engine, it was demonstrated that our method can prevent pre-ignition combustion by setting a proper threshold for precursory-cycle detection. The effectiveness of the fuel-injection control was analyzed.

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Section: Introductionmentioning

confidence: 93%