Improving the Thermal Efficiency of the Homogeneous Charge Compression Ignition Engine by Using Various Combustion Patterns

Yuh-Yih Wu, James H. Wang and Faizan Mushtaq Mir
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Yuh-Yih Wu: Department of Vehicle Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
James H. Wang: Department of Vehicle Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Faizan Mushtaq Mir: Department of Mechanical Engineering, Thapar University, Patiala 147001, India

Energies, 2018, vol. 11, issue 11, 1-20

Abstract: The efficiency of an internal combustion engine (ICE) is essential for automobiles and motorcycles. Several studies have demonstrated that the homogeneous charge compression ignition (HCCI) is a promising technology for realizing engines with high efficiency and low emissions. This study investigated the combustion characteristics of the HCCI using a 125 cc motorcycle engine with n -heptane fuel. The engine performance, combustion characteristics, and thermal efficiency were analyzed from experimental data. The results revealed that a leaner air–fuel mixture led to higher engine efficiency and output. The improvement of engine output is contradictory to the general trend. Energy balance analysis revealed that lower heat loss, due to the low cylinder gas temperature of lean combustion, contributed to higher efficiency. A double-Wiebe function provided excellent simulation of the mass fraction burned ( MFB ) of the HCCI. Air cycle simulation with the MFB , provided by the double-Wiebe function, was executed to investigate this phenomenon. The results indicated that a better combustion pattern led to higher thermal efficiency, and thus the engine output and thermal efficiency do not require a fast combustion rate in an HCCI engine. A better combustion pattern can be achieved by adjusting air–fuel ratio ( AFR ) and the rates of dual fuel and exhaust gas recirculation (EGR).

Keywords: homogeneous charge compression ignition (HCCI); n -heptane; spark-ignition (SI) engine; thermal efficiency; double-Wiebe function (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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