Invention Grant
- Patent Title: Transmission ratio control systems and methods
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Application No.: US14944680Application Date: 2015-11-18
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Publication No.: US09950709B2Publication Date: 2018-04-24
- Inventor: Artin Farahani , Christopher Jay Weingartz , John E. Marano
- 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
- Main IPC: B60W10/06
- IPC: B60W10/06 ; B60W10/107 ; B60W30/188 ; F16H61/662 ; F16H59/14 ; F16H59/24 ; F16H59/44 ; F16H61/00

Abstract:
A target ratio module selectively determines a target ratio of transmission input shaft speed to transmission output shaft speed independently of an accelerator pedal position and as a function of a vehicle speed and a driver axle torque request. A first pulley valve control module controls opening of a first valve based on the target ratio. The first valve controls transmission fluid flow to a first pulley actuator. The first pulley actuator is coupled to the transmission input shaft of a continuously variable transmission (CVT) and expands and contracts based on transmission fluid pressure. A second pulley valve control module controls opening of a second valve based on the target ratio. The second valve controls transmission fluid flow to a second pulley actuator. The second pulley actuator is coupled to the transmission output shaft of the CVT and expands and contracts based on transmission fluid pressure.
Public/Granted literature
- US20170137027A1 TRANSMISSION RATIO CONTROL SYSTEMS AND METHODS Public/Granted day:2017-05-18
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