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首页> 外文会议>International Conference and Exhibition of the SIA Powertrain Electronics >Methodology for the Optimization of the Overall Efficiency of a Combined Cycle: Internal Combustion Engine Coupled to Steam Rankine Cycle on Series Hybrid Electric Vehicles
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Methodology for the Optimization of the Overall Efficiency of a Combined Cycle: Internal Combustion Engine Coupled to Steam Rankine Cycle on Series Hybrid Electric Vehicles

机译：用于优化组合循环的整体效率的方法：内燃机耦合到串联混合动力电动车辆的蒸汽朗肯循环

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摘要

Waste heat recovery (WHR) systems constitute a promising solution for reducing vehicle fuel consumption in order to meet the CAFE targets by 2025. This paper presents a methodology to improve the efficiency of a combined cycle machine consisting of a reciprocating internal combustion engine (ICE) and a bottoming steam Rankine cycle (SRC). It investigates the potential of calibrating the ICE at some specific points of the engine map in order to achieve an optimal overall efficiency when coupled to the bottoming SRC. A three cylinders gasoline engine is modeled using GT suite code and the effect of CA50 variation on exhaust temperature and engine brake efficiency are compared to real engine test bench values. A SRC coupled to this engine is modeled and a Series Hybrid Electric Vehicle (SHEV) model is developed where fuel consumption are simulated using dynamic programing as energy management strategy. The results show an interest in delaying the ignition to enable higher engine exhaust temperature and mass flow rate, which are more favourable for WHR system. The proposed method is also beneficial to avoid knocking problems and can enable in the futur the design of higher compression ratio engines for auxiliary power unit on SHEV.
机译：废热恢复（WHR）系统构成了用于减少车​​辆燃料消耗的有希望的解决方案，以便在2025年满足咖啡厅靶标的方法。本文提出了一种提高由往复式内燃机（冰）组成的组合循环机效率的方法和底部蒸汽QUANNINE循环（SRC）。它研究了在发动机地图的一些特定点处校准冰的可能性，以便在耦合到底部SRC时实现最佳的整体效率。使用GT套件代码建模三缸汽油发动机，并将CA50对排气温度和发动机制动效率的影响与真正的发动机测试台值进行了比较。耦合到该发动机的SRC是建模的，并且开发了一种串联混合动力电动车辆（SHEV）模型，其中使用动态编程作为能量管理策略模拟燃料消耗。结果表明，延迟点火的兴趣使得能够更高的发动机排气温度和质量流量，这对WHR系统更有利。所提出的方法也有利于避免爆震问题，并且可以在避难期未来的辅助动力单元上的更高压缩比发动机的设计。

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