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MODEL-BASED FUEL PATH CONTROL FOR DIESEL ENGINES

机译：基于模型的柴油机燃油路径控制

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In the last decade, the continuous development of turbocharged diesel engines with increased power density has resulted in an impressive success story for light duty diesel vehicles. Upcoming, fundamental changes in the homologation process regarding both pollutant and CO_2-emissions necessitate however an extensive, but efficient use of sophisticated aftertreatment systems in a wide range of operating conditions. Against this background, non-conventional combustion modes with multiple torque producing injections, such as heating modes for DPF regeneration or fast SCR light-off or rich engine operation for purging of the NO_x storage catalyst (NSC), are key components requiring advanced control strategies. This paper discusses a novel fuel path control strategy combining model-based feed forward control with cylinder pressure based feedback control. The control strategy adapts the injection pattern (number of injections) as well as the injection quantities depending on the targets and air path boundary conditions. The model for feed forward control is obtained by modeling different energy flows of the internal combustion engine, such as indicated high pressure work using a design of experiments (DoE) approach. Closed loop combustion control is achieved by deriving suitable combustion control parameters, such as the centroid of heat release. These parameters are calculated in real-time by means of a single zone combustion model. The control strategy is implemented on a rapid-control-prototyping system and validated in transient and stationary operation. Achieved results are promising showing a reliable and constant torque behaviour in different combustion modes under varying ambient conditions with a considerable reduction of the calibration effort (～40%). The model based approach allows shifting rich events to more transient operation resulting in a reduction of the fuel consumption penalty up to 5%, depending on application, test cycle and refinement of base calibration.
机译：在过去的十年中，涡轮增压柴油发动机的持续发展具有增加的功率密度，导致轻型柴油车的令人印象深刻的成功故事。即将到来，关于污染物和CO_2-排放的同源过程的根本变化，但是在广泛的操作条件下，对复杂的后处理系统进行了广泛而有效地使用。在此背景下，具有多个转矩产生注射，诸如加热DPF再生或快速SCR燃或富发动机操作模式为NO_x的存储催化剂（NSC）的吹扫非传统燃烧模式，是需要先进的控制策略的关键部件。本文讨论了一种新的燃料路径控制策略与基于汽缸压力的反馈控制相结合的基于模型的馈电前向控制。根据目标和空气路径边界条件，控制策略适应喷射图案（喷射次数）以及喷射量。通过建模内燃机的不同能量流来获得馈电前向控制模型，例如使用实验设计（DOE）方法的指示的高压工作。通过导出合适的燃烧控制参数，例如热释放的质心来实现闭环燃烧控制。这些参数通过单个区域燃烧模型实时计算。控制策略在快速控制原型系统上实现，并在瞬态和静止操作中验证。实现的结果是有希望在不同的环境条件下显示不同燃烧模式的可靠和恒定的扭矩行为，其校准努力显着降低（〜40％）。基于模型的方法允许将丰富的事件转移到更多的瞬态操作，从而减少燃料消耗损失，这取决于施用，测试周期和基础校准的细化。

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