Air-fuel-ratio control of engine system with unknown input observer

J. Na, G. Herrmann, Clément Rames, R. Burke, C. Brace
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引用次数: 12

Abstract

This paper presents an alternative control to maintain the air-fuel-ratio (AFR) of port-injected spark ignition (SI) engines at certain value, i.e. stoichiometric value, to improve the fuel economy. We first reformulate the AFR regulation problem as a tracking control for the injected fuel mass flow rate, which can simplify the control synthesis when the fuel film dynamics are taken into account. The unknown engine parameters and dynamics can be lumped as an unknown signal, and then compensated by incorporating the unknown input observer into the control design. Only the measurable air mass flow rate through throttle, manifold pressure and temperature, and the universal exhaust gas oxygen (UEGO) sensor are utilized. Simulations based on a mean-value engine model (MVEM) illustrate that the proposed control can achieve satisfactory transient and steady-state performance with strong robustness when the engine is operated in varying speed conditions.
未知输入观测器下发动机系统空燃比控制
本文提出了一种将喷气式火花点火发动机的空燃比(AFR)保持在一定的化学计量值上以提高燃油经济性的替代控制方法。首先将AFR调节问题重新表述为对喷射燃料质量流量的跟踪控制,这样可以简化考虑燃料膜动力学的控制综合。将未知的发动机参数和动力学集总为一个未知信号,然后通过将未知输入观测器纳入控制设计中进行补偿。仅使用可测量的空气质量流量、流道压力和温度以及通用废气氧(UEGO)传感器。基于均值发动机模型(MVEM)的仿真结果表明,所提出的控制方法在发动机变速工况下均能获得满意的暂态和稳态性能,具有较强的鲁棒性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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