Investigation of Sectional-Stage Loading Strategies on a Two-Stage Turbocharged Heavy-Duty Diesel Engine under Transient Operation with EGR

Zhongchang Liu, Xing Yuan, Jing Tian, Yongqiang Han, Runzhao Li and Guanlong Gao
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Zhongchang Liu: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Xing Yuan: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Jing Tian: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Yongqiang Han: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Runzhao Li: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Guanlong Gao: State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China

Energies, 2018, vol. 11, issue 1, 1-19

Abstract: The influence of loading strategies on combustion and emissions parameters is experimentally and numerically studied under typical 5 s transient conditions of constant speed and increasing torque. The experiment is conducted on a two-stage turbocharged heavy-duty diesel engine with a constant opening valve high-pressure exhaust gas recirculation (EGR) system. The test results show that: compared with the full-stage loading (FSL) strategy (constant loading rate during the entire transient process), the sectional-stage loading (SSL) strategies (holding a certain time at 50% load) can significantly reduce soot emissions (by 41.3%); the greater the first-stage loading rate, the better the torque response performance, which maximally increases by 56.7%. Besides, longer loading holding time can effectively restrain the overshoot of EGR rate and advance the combustion phase (CA10, CA50) at medium and large loads. However, the larger second-stage loading rate slightly deteriorates the combustion and emission performance. This deterioration situation can be markedly suppressed by adopting a suitable loading hold time.

Keywords: diesel engine; two-stage turbocharger; transient operation; loading strategy; performance optimization (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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