湿式离合器结合过程瞬态动力学机理与控制技术研究

Wet clutches are key components of the automatic transmission. Favorable engagement process can reduce the shift shock on powertrain components as well as improve the shift quality and reliability of the automatic transmission. However, design of its high-performance clutch actuator, transient dynamic behaviors analysis and pressure control during clutch engagement have been puzzles to be solved. In order to improving the shift quality, the author wants to investigate the transient dynamic behaviors and pressure control during wet clutch engagement process via the theory analysis combined with experimental test..In this proposal, the objectives are four-fold: 1) to theorize the clutch actuator design methods via complex mechanical-electrical-thermal coupling theory; 2) to develop the nonlinear dynamics model including thermodynamic properties based on the clutch engagement process analysis; 3) to reveal the judder behaviors and stability analysis in the clutch engagement process; 4) to study the nonlinear time-delay predictive tracking control strategies for the clutch control..Scientific significance of this proposal is figuring out the transient dynamics behaviors of wet clutch engagement process and revealing the steady-state and transient characteristics. The research results of this proposal will provide a theoretical basis on clutch actuator design and stability analysis of clutch engagement process. Furthermore, this proposal will investigate the nonlinear time-delay predictive tracking control algorithm for the wet clutches pressure control.

湿式离合器是自动变速器的一个关键部件，离合器良好的结合过程可以减少对传动系零部件的冲击、提高自动变速器的换挡品质和可靠性。但是，高效能的离合器执行机构设计及离合器结合过程中的瞬态动力学机理与控制一直是凾待解决的难题。本项目拟采用理论分析与试验验证相结合的方法，研究湿式离合器结合过程的瞬态特性规律及湿式离合器结合过程的压力控制，以期提高车辆的换挡品质。重点研究：1）离合器执行机构复杂机-电-热耦合系统匹配设计方法；2）包含热力学特性的离合器结合过程非线性动力学模型；3）离合器接合过程的抖动机理和稳定性分析；4）离合器压力非线性时滞预测跟踪控制。本研究的科学意义在于探明湿式离合器结合过程的瞬态动力学机理，揭示离合器结合过程的稳态、瞬态特性规律，为离合器执行机构设计和结合过程的稳定性分析提供理论依据；开展湿式离合器非线性时滞预测跟踪控制算法研究，研究结果将为湿式离合器的控制提供理论指导。

本项目的主要研究内容包括研究湿式离合器结合过程的瞬态特性规律及湿式离合器结合过程的压力控制。所开展的工作和创新点包含：离合器执行机构复杂机-电-热耦合系统匹配设计方法；建立了包含热力学特性的离合器结合过程非线性动力学模型；进行了离合器接合过程的抖动机理和稳定性分析；开展了离合器压力非线性时滞预测跟踪控制方面的研究。相关科研成果发表了会议期刊论文6篇（其中SCI论文3篇），申请了发明专利4项，参编英文专著1个章节。此外，在SCI权威期刊组织了车辆传动系统专刊2次。