Study on the Effect of Coupled Internal and External EGR on Homogeneous Charge Compression Ignition under High Pressure Rise Rate

Huayu Tian, Jun Wang, Ran Zhang, Fan Wang, Yan Su and Yaodong Wang ()
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Huayu Tian: Sinopec Research Institute of Petroleum Processing, Beijing 100083, China
Jun Wang: Sinopec Research Institute of Petroleum Processing, Beijing 100083, China
Ran Zhang: Sinopec Research Institute of Petroleum Processing, Beijing 100083, China
Fan Wang: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Yan Su: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Yaodong Wang: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China

Energies, 2023, vol. 17, issue 1, 1-16

Abstract: This paper investigated the effects of exhaust gas recirculation (EGR) on homogeneous charge compression ignition (HCCI) combustion in internal combustion engines. The exhaust valve closing (EVC) timings were scanned to obtain a set of baseline operating points for HCCI, and the coupling control of the internal and external EGR was explored. The results indicate that external EGR delays HCCI ignition timing and slows down the combustion speed. As the internal EGR rate increases, the maximum external EGR ratio that can be tolerated decreases. For HCCI detonation operating points with low internal EGR rates, the addition of up to 10% of external EGR can control the pressure rise rate peak to less than 10 bar/°CA, resulting in reduced fuel consumption and increased indicated mean effective pressure (IMEP). However, for HCCI operating points with high internal EGR rates, the effect of external EGR is mainly observed in the control of the pressure rise rate, with limited increase in IMEP. Additionally, an increasing external EGR rate leads to a significant decrease in nitrogen oxide (NOx) emissions, while carbon monoxide (CO) and hydrocarbon (HC) emissions slightly increase before engine misfire occurs. These findings suggest that the coupling control of internal and external EGR should be explored further, particularly in relation to reducing the negative valve overlap (NVO) angle and improving combustion efficiency.

Keywords: homogeneous charge compression ignition; internal exhaust gas recirculation; external exhaust gas recirculation; indicated mean effective pressure; pressure rise rate; emissions (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: 2023
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