Abstract: This paper briefly introduces the working principle of the continuously variable transmission (CVT), optimizes the control strategy of CVT simulated upshift to address noise issues during wide-open-throttle acceleration, clarifies the goals of simulated upshift performance optimization from the perspectives of acceleration performance and drivability, and presents the use of calibration methods and the design for six sigma (DFSS) tool to improve simulated upshift performance. The optimization scheme is determined by increasing the minimum shift speed for simulated upshift while optimizing the rate of speed variation during the acceleration phase. An orthogonal experiment is designed to obtain the optimal solution. The optimization results show that the 0～100 km/h acceleration time decreases by 0.45 s, and the subjective score of upshift drivability increases by 0.50 point. Spot checks on mass-produced vehicles confirm that all optimized indicators meet the development requirements. This method provides a fast, efficient, and low-cost approach to optimizing simulated upshift performance, offering good engineering reference value.

Key words: continuously variable transmission; simulated upshift; DFSS; orthogonal experiments

摘要： 文章简要介绍了无级自动变速箱（CVT）的工作原理，并针对 CVT 大油门加速工况下的 噪声问题，优化了 CVT 模拟升挡控制策略，分别从加速性和驾驶性两方面明确了模拟升挡性 能优化的目标，并介绍了如何利用标定手段和六西格玛设计（DFSS）工具改善模拟升挡性能的 思路。确定优化方案为提高模拟升挡最低换挡转速的同时，优化其加速段转速变化速率，设 计正交试验，得出最优方案。优化结果表明，百公里加速时间减少 0.45 s，升挡驾驶性主观评 价分数提高了 0.50 分。量产车抽查验证结果表明，各项性能指标均满足开发要求。文章提出的 这种快速高效且低成本优化模拟升挡性的控制方法，具有较好的工程参考意义。

关键词: 无级自动变速箱；模拟升挡；DFSS；正交试验