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

职业：具有可变气门运动的内燃机的建模和控制

• 批准号: 9733293
• 负责人: Anna Stefanopoulou
• 金额: $ 25万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9733293&HistoricalAwards=false
• 关键词: CAREER; Modeling; Control; IC; Engines

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. ***

在过去的二十年里，动力总成控制系统在很大程度上是由旨在提高燃油经济性和减少排放的政府法规推动的。一种潜在地满足这些性能要求的方法是优化火花点火发动机的排气门和进气门运动。通过无凸轮配气机构可以实现附加驱动，从而形成一个非线性和高度多变量的发动机。通过刻画可变气门运动对传统发动机模型结构的本质改变，我们将建立一个非线性和多变量发动机的唯象模型。所开发的模型旨在填补目前用于研究无凸轮发动机的解析热力学发动机模型和稳态发动机模型之间的空白。我们将识别固有的系统限制，因为它们是由基本离散的对象属性、子系统相互作用和传感器/执行器保真度/权威施加的约束引起的。将开发一种将系统限制转换为性能折衷及其对控制设计参数的影响的严格方法。最后，我们将研究控制器结构对发动机动态响应的影响。我们的目的是提高对子系统相互作用可能的有害后果的理解，以及协调、多变量反馈的潜力，以缓解这些限制。本项目将允许学生整合流体、热力学和系统理论的各个方面，用于可变气门运动发动机的开发和控制设计。我们的教学目标是让学生接触到动力总成控制这一高度跨学科的领域。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，增进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，并在分析和综合对我国国家竞争力至关重要的技术时结合系统理论概念和工程设计标准。***