Title: Simulation and experimental study on ion current under GDI-HCCI combustion mode

Authors: Yinbo Cao; Yulin Chen; Jun Deng; Zongjie Hu; Robert W. Dibble; Liguang Li

Addresses: School of Automotive Studies, Tongji University, Shanghai, 201804, China; United Automotive Electronic Systems Company Limited, Shanghai, 201206, China ' School of Automotive Studies, Tongji University, Shanghai, 201804, China; Department of Mechanical Engineering, University of California at Berkeley, USA ' School of Automotive Studies, Tongji University, Shanghai, 201804, China ' School of Automotive Studies, Tongji University, Shanghai, 201804, China ' School of Automotive Studies, Tongji University, Shanghai, 201804, China; Department of Mechanical Engineering, University of California at Berkeley, USA ' School of Automotive Studies, Tongji University, Shanghai, 201804, China; CDHK, Tongji University, Shanghai, 201804, China

Abstract: For a gasoline HCCI engine, the major challenge comes from the ignition and combustion control. Therefore, a feedback signal is necessary to detect combustion state and to realise closed-loop control of combustion process, and ionisation technology was studied for the purpose. The simulation results indicated that the 3D-CFD model could accurately predict in-cylinder pressure, heat release rate, ion profile, ion distribution and its generation mechanism. The experimental results showed that the fuel injection rate in NVO was of more significance to the HCCI combustion phase and the ion current, and HCCI combustion phase can be controlled by the fuel transmutation. In the wake of the excess air coefficient reducing, the amplitudes of the cylinder pressure and ion current were increased, and the phases were advanced. Under high load condition, the reduction of the throttle percentage caused increase in the fluctuation of the IMEP coefficient but weakness in the middle load.

Keywords: homogenous charge compression ignition; HCCI engines; ion current; negative valve overlap; NVO; HCCI combustion phase; fuel transmutation; excess air coefficient; simulation; GDI; gasoline direct injection; petrol direct injection; ionisation; CFD; computational fluid dynamics; cylinder pressure; heat release rate; ion profile; ion distribution; ion generation; throttle percentage.

DOI: 10.1504/IJPT.2016.076566

International Journal of Powertrains, 2016 Vol.5 No.2, pp.120 - 147

Available online: 13 May 2016 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article