关键词: 无级自动变速箱；模拟升挡；DFSS；正交试验

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