Optimal Injection Strategies to Compensate for Injector Aging in Common Rail Fuel Systems
Optimal Injection Strategies to Compensate for Injector Aging in Common Rail Fuel Systems
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DOI：
10.4271/2018-01-1160
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发表时间：
2018-01-01
影响因子：
1.2
通讯作者：
Rixen, Daniel J.
中科院分区：
文献类型：
--
作者：
Hofmann, Oliver;Schuckert, Sebastian;Rixen, Daniel J.
已知在燃料喷射喷嘴中发生的诸如焦化或侵蚀损坏的老化效应会使发动机性能劣化。本文提出了一种优化方法来补偿喷油器老化，并通过调整喷射策略来控制发动机寿命期间的燃烧行为。首先，提出了一个面向控制的燃烧模型，该模型考虑了喷油嘴的状态。该模型结合以往研究的整个燃油喷射系统的仿真模型，能够预测不同工况下的放热率（HRR）。测量与单缸柴油机，使用喷油器与修改和老化的喷嘴，以验证所提出的燃烧模型，特别是分析喷油器老化的影响。利用该仿真模型，采用线搜索优化方案，得到了最优喷射策略，以恢复参考HRR轨迹。仿真结果表明，所提出的方法具有很大的潜力，提高长期的发动机效率和控制废气排放。
Aging effects such as coking or erosive damage that occur in fuel injection nozzles are known to deteriorate the engine performance. This article proposes an optimization method to compensate for injector aging and to control the combustion behavior over engine lifetime by adapting the injection strategy. First, a control-oriented combustion model is presented, which takes the condition of the injection nozzle into account. In combination with a simulation model of the entire fuel injection system from a previous study, the model is capable of predicting the heat release rate (HRR) at different working conditions. Measurements with a single-cylinder diesel engine were performed, using injectors with modified and aged nozzles, to validate the proposed combustion model and particularly to analyze the influence of injector aging. Using the simulation model, optimal injection strategies were obtained by applying a line search optimization scheme to recover a reference HRR trajectory. Simulation results of the proposed method demonstrate the great potential for improving long-term engine efficiency and controlling exhaust emissions.