- 专利标题: Ratio selection method for a continuously variable transmission during deceleration by braking
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申请号: US16418593申请日: 2019-05-21
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公开(公告)号: US10774930B1公开(公告)日: 2020-09-15
- 发明人: Xuefeng T. Tao , Steven P. Moorman , Ronald W. Van Diepen , Jeffrey M. DeSimone , Madhura N. Paranjape
- 申请人: GM Global Technology Operations LLC
- 申请人地址: US MI Detroit
- 专利权人: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- 当前专利权人: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- 当前专利权人地址: US MI Detroit
- 主分类号: F16H61/66
- IPC分类号: F16H61/66 ; F16H61/662 ; F16H59/48 ; F16H59/54 ; F16H59/36 ; F16H59/68 ; F16H59/72 ; F16H59/70
摘要:
A method and system for selecting a speed ratio for a continuously variable transmission (CVT) of a vehicle during braking. The method and system includes determining a Current Actual Speed Ratio of the CVT when the distance of a brake pedal travel exceeds a predetermined distance, determining, by a transmission control module (TCM), an amount of Available Speed Ratio Change (Δr), a Current Ratio Change Capability (Current-{dot over (r)}), and a Predictive Ratio Change Capability (Predictive-{dot over (r)}). The method further includes the TCM calculating a Time to Reach the Minimum Under-drive Ratio (tUD), calculating a Predicted Velocity of the Vehicle (vPr) using (tUD), determining a Desired Speed Ratio of the CVT using the Predicted Velocity of the Vehicle (vPr), and actuating the CVT to the Desired Speed Ratio.
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