张益超 江铭 谷城 刘志军 陆妍秋



摘 要:液力变矩器作为搭载无级变速器车型的重要动力传递部件。在分析当前液力变矩器控制策略基础上,增加一种新的适用于车辆起步时的液力变矩器滑摩状态;分析液力变矩器处于这种滑摩状态时的动力传递,在保护液力变矩器的基础上识别车辆起步工况并通过液压控制使液力变矩器进入起步滑摩状态。该控制策略开发过程遵守ASPICE流程规范以保证软件的开发质量,以TCU(变速器控制器)为载体在实车上完成验证。
关键词:液力变矩器控制 ASPICE开发流程 起步滑摩控制 CVT控制
Research on Starting Slip Control of Hydraulic Torque Converter based on CVT
Zhang Yichao Jiang Ming Gu Cheng Liu Zhijun Lu Yanqiu
Abstract:Hydraulic torque converter is an important part of power transmission for CVT models, Based on the analysis of the current torque convertercontrol strategy, a new torque converter sliding state is proposed. The power transfer of the torque converter in this sliding state was analyzed. The vehicle starting condition was identified based on the protection of the torque converterand the torque converter was put into the starting sliding state by hydraulic control. The development process of the control strategy fully complies with the ASPICE process specification to ensure the quality of software development, and the TCU (transmission controller) is used as the carrier to complete the verification in the real vehicle.
Key words:hydraulic torque converter control, ASPICE, starting slip control, CVT control
1 前言
在無极变速器(CVT)中,液力变矩器作为核心部件之一,起了至关重要的作用。目前带锁止离合器的液力变矩器广泛应用在无级变速器(CVT)中。当车辆的速度较低时,液力变矩器中的锁止离合器打开,液力变矩器发挥起步增扭作用,保证车辆起步时的扭矩同时减小发动机状态波动带来的影响。当车辆达到一定速度时,通过压力控制锁止离合器锁止,此时动力传递处于刚性连接,提升了传动效率,提高了燃油经济性。因此,在保证动力性、油耗经济型与驾驶舒适性的前提下,带锁止离合器的液力变矩器的锁止过程控制方法研究成为重点。
本文从扩大液力变矩器锁止区间及节省能耗的目的出发,在保证车辆驾驶性、动力性的前提下,挖掘液力变矩器的硬件特性,通过起步滑摩功能降低液力变矩器的锁止车速。在车辆……