Experimental Study for Effect of Multi-Site Spark Ignition on Dedicated Hybrid Engine Performance under High Dilution Condition  

作　　者：YAN Bowen WATERS Benjamin HAINES Andrew MCGHEE Mike HU Tiegang DENG Wei PU Yongxian MA Tianyu 

机构地区：[1]Powertrain Engineering R&D Center,Chongqing Changan Automobile Co.,Ltd.,Chongqing 400000,China [2]Changan UK R&D Centre Limited,Birmingham B377YG,United Kingdom

出　　处：《Journal of Thermal Science》2025年第1期254-267,共14页热科学学报(英文版)

基　　金：the financial support provided by Chongqing Technical Innovation and Application Development Project(cstc2020jscx-dxwtBX0024);China Internal Combustion Engine Society Youth Talent Promotion Program。

摘　　要：In this study,a triple spark ignition scheme was first designed on a three-cylinder 1.5-L dedicated hybrid engine(DHE).On this basis,the effect of different ignition modes on engine combustion and emission characteristics was studied,especially under high dilution condition.The results tested at 2000 r/min and 0.8 MPa BMEP(brake mean effective pressure)show that with highly increased in-cylinder flow intensity,using only passive prechamber(PPC)has a lower lean limit than that with single central spark plug(CSP),thereby leading to slightly higher minimum fuel consumption and nitrogen oxides(NO_(x))emissions.Adding side spark plugs(SSP)based on PPC can result in improved capability of lean limit extension and engine performance than CSP.However,the improvement level is lower than that with triple spark plugs(TSP).As the excess air ratio λ increases,the advantage of PPC and PPC with SSP in improving the combustion phasing compared with CSP gradually weakens.Correspondingly,the increasing tendency of their ignition delay and combustion duration is more obvious.The added SSP based on PPC can effectively shorten the ignition delay of leaner mixture,but the combustion duration can be only slightly improved.As a result,under extremely lean condition,the advantage of PPC and PPC with SSP in terms of combustion characteristics over CSP becomes much smaller.In contrast,the TSP ignition can achieve much shorter ignition delay and combustion duration simultaneously under this condition.Due to the highest available dilution level,the TSP ignition achieves the lowest raw NO_(x)emissions.Moreover,it can also reduce the raw carbon monoxide(CO)and hydrocarbons(HC)emissions compared to CSP due to a more thorough combustion of the end gas mixture.Based on the excellent performance of TSP,the highest engine brake thermal efficiency(BTE)was further explored.The results show that with normal RON 92 fuel,the engine finally achieved 43.69% and 45.02% BTE under stochiometric mode with exhaust gas recirculation(EGR)and lean-burn mode resp

关 键 词：dedicated hybrid engine triple spark plug scheme passive prechamber high dilution condition thermal efficiency NO_(x)emissions 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]