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
(This article belongs to the Special Issue Recent Advances in Internal Combustion Engines Operation and Emissions)
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-TextKeywords:
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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