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Energies 2018, 11(1), 69; doi:10.3390/en11010069

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

State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
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Received: 7 December 2017 / Revised: 26 December 2017 / Accepted: 26 December 2017 / Published: 1 January 2018
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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. View Full-Text
Keywords: diesel engine; two-stage turbocharger; transient operation; loading strategy; performance optimization diesel engine; two-stage turbocharger; transient operation; loading strategy; performance optimization
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Liu, Z.; Yuan, X.; Tian, J.; Han, Y.; Li, R.; Gao, G. Investigation of Sectional-Stage Loading Strategies on a Two-Stage Turbocharged Heavy-Duty Diesel Engine under Transient Operation with EGR. Energies 2018, 11, 69.

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