Effects of Two Pilot Injection on Combustion and Emissions in a PCCI Diesel Engine

Deqing Mei, Qisong Yu, Zhengjun Zhang, Shan Yue and Lizhi Tu
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Deqing Mei: School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Qisong Yu: School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Zhengjun Zhang: School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Shan Yue: School of Business, Jinken College of Technology, Nanjing 210000, China
Lizhi Tu: Shanghai FEV Powertrain Technology Company, Shanghai 200336, China

Energies, 2021, vol. 14, issue 6, 1-14

Abstract: The effects of two pilot injections on combustion and emissions were evaluated in a single−cylinder turbocharged diesel engine, which operated in premixed charge compression ignition (PCCI) modes with multiple injections and heavy exhaust gas recirculation under the low load by experiments and simulation. It was revealed that with the delay of the start of the first pilot injection ( SOI−P1 ) or the advance of the start of second pilot injection ( SOI−P2 ), respectively, the pressure, heat release rate ( HRR ), and temperature peak were all increased. Analysis of the combustion process indicates that, during the two pilot injection periods, the ignition timing was mainly determined by the SOI−P2 while the first released heat peak was influenced by SOI−P1 . With the delay of SOI−P1 or the advance of SOI−P2 , nitrogen oxide (NOx) generation increased significantly while soot generation varied a little. In addition, increasing Q 1 and decreasing the second pilot injection quantity ( Q 2) can manipulate the NOx and soot at a low level. The advance in SOI−P2 of 5 °CA couple with increasing Q 1 and reducing Q 2 was proposed, which can mitigate the compromise between emissions and thermal efficiency under the low load in the present PCCI mode.

Keywords: premixed charge compression ignition (PCCI); multiple injection; two pilot injection; combustion; emissions; experiments; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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