CAREER: Modeling and Control of IC Engines with Variable Valve Motion

在过去的二十年里，动力总成控制系统有了重大的发展，这主要是由旨在提高燃油经济性和减少排放的政府法规推动的。一种可能满足这些性能要求的方法是优化火花点火发动机的排气和进气阀运动。附加驱动可以通过无凸轮气门机构来实现，从而形成一个非线性和高度多变量的发动机。提出的项目是发动机建模和多变量控制领域研究的结合。我们将通过表征可变气门运动在传统发动机模型结构中引入的基本修改，为非线性和多变量发动机建立一个现象学模型。所开发的模型旨在填补目前用于研究无凸轮发动机的分析热力学发动机模型和稳态发动机模型之间的空白。我们将确定固有的系统限制，因为它们来自基本上离散的工厂特性，子系统相互作用和传感器/执行器保真度/权威施加的约束。将开发一种将系统限制转换为性能权衡及其对控制设计参数的含义的严格方法。最后，我们将研究控制器结构对发动机动力响应的影响。我们的目的是提高对子系统相互作用可能产生的有害后果的理解，以及为减轻这些限制而协调的多变量反馈的潜力。本项目将使学生整合流体、热力学和系统理论的各个方面，以开发和控制可变气门运动发动机。我们的教学目标是让学生接触到动力传动系统控制的高度跨学科领域。学生可以在开发清洁汽车的潜在解决方案方面发挥重要作用。同时，他们将通过积极参与先进发动机技术的前沿，加强对多变量反馈控制理论领域的理解。拟议的研究项目及其教学方面强调跨学科参与，并将系统理论概念和工程设计标准结合起来，分析和综合对我国国家竞争力重要的技术。＊＊＊

9733293StefanopoulouOver the last two decades there has been a significant evolution in powertrain control systems, largely driven by government regulations aimed at improving fuel economy and reducing emissions. One way to potentially meet these performance requirements is to optimize the exhaust and intake valve motion in a spark ignited engine. The additional actuation can be realized with a camless valvetrain and results in a nonlinear and highly multivariable engine.The proposed project is a combination of research in the area of engine modeling and multivariable control. We will develop a phenomenological model for the nonlinear and multivariable engine by characterizing the essential modifications that variable valve motion introduces in the structure of the conventional engine model. The developed model is intended to fill the gap between the analytical thermodynamic engine models and the steady-state engine models that are currently used for studying camless engines. We will identify the inherent system limitations as they arise from fundamentallly discrete plant properties, subsystem interactions and contstraints imposed by sensor/actuator fidelity/authority. A rigorous methodology of translating the system limitations to performance tradeoffs and their implication to the control design parameters will be developed. Finally, we will study the impact of controller architecture on the engine dynamie response. Our intent is to improve the understanding of the possible detrimental consequences of subsysem interaction, and the potential of coordinated, multivariable feedback for alleviating these limitations.This project will allow students to integrate various aspects of fluid, thermodynamic and systems theory for the development and the control design of the variable valve motion engine. Our pedagogical objective is to expose students to the highly interdisciplinary area of powertrain control. Students can play an important role in developing potential solutions to cleaner automobiles. Meanwhile, they will enhance their understanding in the area of multivariable feedback control theory by their active participation in the forefront of advanced engine technologies. The proposed research project and its pedagogical aspects stress cross-disciplinary involvement and combine system theoretical concepts and engineering design criteria in the analysis and synthesis of technologies important to our national competitiveness. ***