Torque ratio bounds for automatic transmissions

A vehicle includes a multi-speed transmission having an input shaft and an output shaft, an actuator, and a torque converter having an impeller selectively coupled to the actuator and a turbine coupled to the input shaft. A vehicle controller is programmed to, in response to an estimated torque rati...

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Bibliographic Details
Main Authors Veeramurthy, Gangarjun, Doering, Jeffrey A, Meyer, Jason, Yamazaki, Mark Steven
Format Patent
LanguageEnglish
Published 23.11.2021
Subjects
BLASTING
ENGINEERING ELEMENTS AND UNITS
GEARING
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:A vehicle includes a multi-speed transmission having an input shaft and an output shaft, an actuator, and a torque converter having an impeller selectively coupled to the actuator and a turbine coupled to the input shaft. A vehicle controller is programmed to, in response to an estimated torque ratio between the impeller and output shaft of the transmission being less than a minimum torque ratio between the impeller and output shaft of the transmission during a shift of the transmission, command torque to the actuator based on a driver-demanded wheel torque and the minimum torque ratio, and, in response to the estimated torque ratio exceeding the minimum torque ratio during the shift of the transmission, command another torque to the actuator based on the driver-demanded wheel torque and the estimated torque ratio.
Bibliography:Application Number: US202017003339