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    • 陈贵升，李冰，李靓雪, 周群林, 杨杰，黄震.气门二次开启策略对柴油机性能及能量损失的影响[J].内燃机工程,2021,42(2):53-63.
    Influence of Valve Re-Opening Strategies on Performance and Energy Loss of a Diesel Engine
    DOI：10.13949/j.cnki.nrjgc.2021.02.008
    Key Words:diesel engine  valve re-opening  combustion characteristic  Nox emission  energy loss
    Author NameAffiliation
    CHEN Guisheng, LI Bing, LI Liangxue, ZHOU Qunlin, YANG Jie, HUANG Zhen 1.Yunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology,Kunming 650500, China
    2.Faculty of Civil Aviation and Aeronautics, Kunming University of Scienceand Technology, Kunming 650500, China 
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    Abstract:Based on a common-rail diesel engine equipped with two-stage turbocharger system, a one-dimensional thermodynamic model was established to study the effects of different valve secondary opening strategies (intake valve re-opening, exhaust valve re-opening as well as intake and exhaust valves re-opening) on engine combustion, NOx emissions and energy distribution. The results show that, at the same valve lift, with the advances of the intake valve re-opening timing and exhaust valve re-opening timing, and with the increase of interval between the timings of the intake valve re-opening and exhaust valve re-opening, the pressure in the cylinder and peak heat release rate increases, the crank angle corresponding to 50% of total heat release (CA50) advances, and the brake thermal efficiency, combustion temperature as well as NOx emissions increases. At the same valve re-opening timing, the influence of increasing valve lift on the engine performance and emissions increases. The comparison of the different valve re-opening strategies shows that the re-opening of both intake and exhaust valves has the greatest impact on the CA50, exhaust energy loss, brake thermal efficiency and NOx emissions, while the exhaust valve re-opening strategy has the least impact. The trade-off between the brake specific fuel consumption (BSFC) and NOx emissions can be better improved by the intake valve re opening strategy with the intake valve lift being 2.4 mm and the re-opening timing 30 degrees after bottom dead center.
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