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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >TURBOCHARGED CNG ENGINES FOR URBAN TRANSPORTATION: EVALUATION OF TURBOLAG REDUCTION STRATEGIES BY MEANS OF COMPUTATIONAL ANALYSES
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TURBOCHARGED CNG ENGINES FOR URBAN TRANSPORTATION: EVALUATION OF TURBOLAG REDUCTION STRATEGIES BY MEANS OF COMPUTATIONAL ANALYSES

机译：涡轮增压天然气发动机用于城市交通：通过计算分析的方法评估涡轮减少策略

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摘要

Nowadays, many urban buses for public transportation are fuelled by compressed natural gas (CNG), due to its potential for energy saving and pollutant reduction, with specific reference to particulate matter emissions. However, turbocharging is required to recover the gaseous-fuel related power gap with respect to more traditional engines running on liquid fuels. Therefore, turbolag reduction is fundamental to achieve high performance during engine transients. Significant support for the study of turbocharged CNG engines and guidelines for the turbomatching process can be provided by 1D numerical simulation tools.rnIn this paper, the topic of turbolag reduction is analyzed, and different strategies, namely, Early-Exhaust Valve Opening-Variable Valve Actuation (E-EVO-WA) and spark timing control for combustion retard (ComR), are analyzed by means of a specifically developed and calibrated GT-POWER~? engine model. Tip-in maneuvers in which the engine was coupled to a torque hydraulic converter under stall conditions were investigated, so as to reproduce a typical load transient condition for an urban bus accelerating from engine idle.rnThe best improvement of turbolag was obtained by combining E-EVO-WA and ComR, with a reduction of turbolag ranging from 60% to 70%. When a limit on the in-cylinder pressure is introduced, in order to prevent excessive exhaust valve mechanical stresses, the higher achievable reduction in turbolag was found to be between 35% and 45%.
机译：如今，许多城市公交车辆都以压缩天然气（CNG）为燃料，因为它具有节能和减少污染物的潜力，特别涉及颗粒物的排放。然而，相对于使用液体燃料运行的更传统的发动机，需要涡轮增压以恢复与气体燃料相关的功率间隙。因此，减少涡轮增压滞后对于在发动机瞬变期间实现高性能至关重要。一维数值模拟工具可为研究涡轮增压CNG发动机和涡轮匹配过程的指导提供重要支持。本文分析了减少涡轮增压的主题，并提出了不同的策略，即提前排气门开启-可变气门通过专门开发和校准的GT-POWER〜来分析促动（E-EVO-WA）和燃烧延迟的火花正时控制（ComR）。引擎模型。研究了在失速条件下发动机与液力变矩器相连的踩入式操作，从而再现了从发动机怠速加速的城市客车的典型负载瞬态工况。通过结合E- EVO-WA和ComR，其Turbolag减少了60％至70％。当引入缸内压力的限制时，为了防止过度的排气门机械应力，发现涡轮增压的更高的可实现减小在35％至45％之间。

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