A Brief Overview on Ion Current Detecting Technology of Gasoline Engines and Its Application Potential in FSAE

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A Brief Overview on Ion Current Detecting Technology of Gasoline Engines and Its Application Potential in FSAE

Zhou, Nanxi / Yang, Lv / Peng, Kaile / Hu, Jianjun / Kang, Zhe

By applying a directional electric field in the combustion chamber, the charged intermediate products such as ions and electrons, are directionally migrated during the combustion process in the cylinder. By doing so, an ion current signal is formed in the detection circuit to establish a real-time estimation and closed-loop control of the combustion status based on the in-cylinder ion current detection. Based on the published literatures on in-cylinder ion current detection, this paper analyzes and summarizes the formation mechanism of ion currents in gasoline engines, elaborates the skeleton mechanism of ion current formation process, and based on this mechanism, sorts out the related gasoline engine in-cylinder ion current detection system and its principle. Besides, the development stages of ion current detection technology in gasoline engines are summarized, its application potential in FSAE gasoline engine calibration and performance optimization is analyzed. At the same time, by using the developed in-cylinder ion current detection system, the internal combustion engine of FSAE racing car of Chongqing University in the 2020 season is carefully optimized based on engine bench calibration within the engine laboratory of Chongqing University.