Investigation on characteristics of ion current in methanol direct-injection spark-ignition engine (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Investigation on characteristics of ion current in methanol direct-injection spark-ignition engine (PDF)
- 发表刊物：
- Fuel
- 摘要：
- Investigation on the characteristics of ion current in a direct-injection stratified-charge engine fueled with methanol was conducted. The test engine is a retrofitted 4-cylinder diesel engine with installation of a spark plug. Ion current was measured using the spark plug as ion sensor. Cylinder pressure was recorded and cylinder average temperature was calculated. The band-pass filtering and low-pass filtering method were chosen to extract the frequency and amplitude of ion current for the knock evaluation. Results shows that ion-current signals measured in the methanol engine under normal combustion conditions contain the front-flame stage and the post-flame stage. The characteristic parameters of ion current relate to the methanol engine operating conditions. The pattern of ion current shows high frequency oscillation under the knock conditions, and the amplitude of ion current frequency can reflect the knock intensity. The frequency of ion current signals under knock conditions is ∼7 kHz. The knock evaluation index determined by band-pass filtering and low-pass filtering methods is in good agreement with the experimental results. Ion current method can effectively diagnose the knock of direct-injection methanol engines.
- 合写作者：
- Gao ZQ, Li BZ, Li CY, Liu B, Liu SH, Wu XM, Huang ZH
- 卷号：
- 2014, 141: 185-191
- 页面范围：
- 185-191
- 是否译文：
- 否
- 发表时间：
- 2015-01-25