A comprehensive analysis of the intake valve opening duration (IVOD) effects on the performance of an Atkinson cycle engine is conducted in this work using numerical simulation and experimental validation. Through one-dimensional simulation, the relationship between the range of IVOD and the compression ratios is firstly investigated under the constraint of compression pressure. Two representative IVOD, 295 and 314°CA, are then respectively applied to the performance simulation and experiment of a practical Atkinson cycle engine. The simulation shows the combination of a late intake valve opening timing (IVO) angle and a late exhaust valve opening timing (EVO) angle is profitable for improving the fuel economy under part load operating conditions (i.e. 2000 [email protected] bar and 3000 [email protected] bar). The experimental results present the Atkinson cycle engine under both IVOD scenarios considerably improves the brake specific fuel consumption (BSFC) and reduces the pumping mean effective pressure (PMEP) compared to those of the original Otto cycle engine. Meanwhile, the comparison between two IVOD scenarios show that the shorter IVOD leads to an improvement of indicated thermal efficiency, especially at lower load. Considering fuel economy, a shorter IVOD is more favorable at part load for the Atkinson cycle engine. Two main contributions of this work are to numerically quantify the IVOD range for the Atkinson cycle engine under part load, and to experimentally validate the effectiveness of simulation. The findings of this work are expected to support the design of Atkinson cycle engines and provide a guideline of IVOD optimization under part load.

在这项工作中，使用数值模拟和实验验证对进气门打开持续时间（IVOD）对阿特金森循环发动机性能的影响进行了全面分析。通过一维模拟，首先在压缩压力的约束下研究了IVOD范围与压缩比之间的关系。然后分别将两个有代表性的IVOD（295和314°CA）应用于实际的阿特金森循环发动机的性能仿真和实验。仿真显示，进气门延迟打开正时（IVO）角和排气门延迟打开正时（EVO）角的组合对于提高部分负荷工况下的燃油经济性（例如2000 [email protected] bar和3000 [email protected] bar）是有利的。电子邮件保护]栏）。实验结果表明，与原始的奥托循环发动机相比，在两种IVOD情况下的阿特金森循环发动机都显着改善了制动比燃油消耗（BSFC），并降低了泵送平均有效压力（PMEP）。同时，两种IVOD方案之间的比较表明，较短的IVOD可以提高指示的热效率，尤其是在较低负载下。考虑到燃油经济性，对于阿特金森循环发动机，在部分负荷下较短的IVOD更为有利。这项工作的两个主要贡献是在数值上量化了部分负载下阿特金森循环发动机的IVOD范围，并通过实验验证了仿真的有效性。