Invention Grant
- Patent Title: Mode transition control in a CVT with fixed gear functionality
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Application No.: US15532264Application Date: 2014-11-26
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Publication No.: US10295056B2Publication Date: 2019-05-21
- Inventor: Ying Huang , Chengwu Duan
- Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC.
- Current Assignee: GM Global Technology Operations LLC.
- Current Assignee Address: US MI Detroit
- Agency: Quinn IP Law
- International Application: PCT/CN2014/092302 WO 20141126
- International Announcement: WO2016/082132 WO 20160602
- Main IPC: F16H61/662
- IPC: F16H61/662 ; F16G1/28 ; F16G5/20 ; F16H9/24 ; F16H9/18 ; F16H55/17 ; F16H55/56 ; F16H61/00 ; F16H59/46

Abstract:
A vehicle includes a power plant, continuously variable transmission (CVT), drive wheels, sensors, and controller. The CVT achieves a fixed gear/positive engagement and friction drive modes, and includes an input member that receives input torque from the power plant, an output member, and a variator assembly having drive and driven variator pulleys. The pulleys are connected to each other via an endless rotatable drive element, and to a respective one of the input and output members. Pulley actuators change a CVT speed ratio. The controller calculates a relative slip of the pulleys using measured speeds and displacements from the sensors, reduces the relative slip until the relative slip is below a calibrated speed limit or within a calibrated speed range via actuator control signal to the pulley actuators, and commands the fixed gear/positive engagement mode via positive engagement control signals to the CVT until the relative slip reaches zero.
Public/Granted literature
- US20170314676A1 MODE TRANSITION CONTROL IN A CVT WITH FIXED GEAR FUNCTIONALITY Public/Granted day:2017-11-02
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