高稀释增压压燃式发动机燃烧相位建模与控制
Combustion Phasing Modelling and Control for Compression Ignition Engines with High Dilution and Boost Levels
摘要：
由于燃料效率受到内燃机中的燃烧正时的显著影响，因此燃烧定相的精确控制是至关重要的。在本文中，一个非线性燃烧相位模型的引入和校准，和基于模型的前馈控制策略和基于模型的自适应控制策略的燃烧相位控制进行了研究。燃烧相位模型结合了爆震积分模型、燃烧持续期模型和Wiebe函数来预测柴油机的燃烧相位。该模型被简化为更适合于燃烧定相控制，并且使用包括具有高废气再循环分数和高增压水平的条件的模拟和实验数据来校准和验证。基于该模型，设计了自适应非线性模型控制器进行闭环控制，设计了前馈模型控制器进行开环控制。这两种控制方法在模拟中进行了测试。仿真结果表明，在瞬态变化过程中，自适应控制的CA50（燃烧50%燃油质量时的曲轴转角）可以在不超过5个循环的时间内达到稳态，稳态误差小于± 0.1CAD，前馈模型控制的稳态误差小于± 0.5CAD。
英文摘要：
Because fuel efficiency is significantly impacted by the timing of combustion in internal combustion engines, accurate control of combustion phasing is critical. In this paper, a nonlinear combustion phasing model is introduced and calibrated, and both a feedforward model-based control strategy and an adaptive model-based control strategy are investigated for combustion phasing control. The combustion phasing model combines a knock integral model, burn duration model and a Wiebe function to predict the combustion phasing of a diesel engine. This model is simplified to be more suitable for combustion phasing control and is calibrated and validated using simulations and experimental data that include conditions with high exhaust gas recirculation fractions and high boost levels. Based on this model, an adaptive nonlinear model-based controller is designed for closed-loop control, and a feedforward model-based controller is designed for open-loop control. These two control approaches were tested in simulations. The simulation results show that during transient changes the CA50 (the crank angle at which 50% of the mass of fuel has burned) can reach steady state in no more than 5 cycles and the steady state errors are less than +/-0.1 crank angle degree (CAD) for adaptive control, and less than +/-0.5 CAD for feedforward model-based control.
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