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- W4328100166 abstract "Variable valve timing (VVT) and Miller cycle are advanced technologies employed to optimize engine performance by improving airflow exchange, which are seldom investigated based on the direct-injection (DI) hydrogen engine. The objective of this study is to assess the effects of intake valve closing (IVC) and exhaust valve opening (EVO) timing on the gas exchange performance, combustion, and emissions of a DI hydrogen engine, after which a synergistic control strategy of IVC and EVO timing is proposed. This work is conducted under wide-open throttle and 1500 rpm. The results indicate that the synergistic control of IVC and EVO timing can increase volumetric efficiency by more than 40%, enhance gas exchange performance, shorten combustion duration, and reduce cyclic variation, resulting in approximately 43.15% brake thermal efficiency. Furthermore, brake mean effective pressure can be increased by more than 60% and NO emissions are controlled to less than 20 ppm by optimizing valve timings." @default.
- W4328100166 created "2023-03-22" @default.
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- W4328100166 date "2023-06-01" @default.
- W4328100166 modified "2023-10-17" @default.
- W4328100166 title "Assessment of a synergistic control of intake and exhaust VVT for airflow exchange, combustion, and emissions in a DI hydrogen engine" @default.
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- W4328100166 doi "https://doi.org/10.1016/j.ijhydene.2023.03.002" @default.
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