Patent ID: 8068948
Filing Date: 2011-11-29
Classification: B60W,F16H

Abstract:
1. A method of performing shifts in hybrid powertrains configured for operation in multiple electrically variable transmission modes (EVT) and having an internal combustion engine, a first electric machine, and a second electric machine, the method comprising: determining whether a multiple-shift maneuver is needed, wherein said multiple-shift maneuver includes an initial EVT mode, an intermediate EVT mode, and a target EVT mode; determining whether a single-staged input profile is needed to execute said multiple-shift maneuver; creating said single-staged input speed profile; matching said single-staged input speed profile with one of a first multiple-shift pattern and a second multiple-shift pattern, wherein both of said multiple-shift patterns are characterized by a lack of fixed-gear propulsion during said multiple-shift maneuver; performing one of said first and second multiple-shift patterns by utilizing both a quasi-asynchronous transitional shift event and an electric torque converter transitional shift event; wherein said quasi-asynchronous transitional shift event utilizes a first oncoming clutch and a first offgoing clutch, and includes: wherein said electric torque converter transitional shift event utilizes a second oncoming clutch and a second offgoing clutch, and includes: wherein performing one of said first and second multiple-shift patterns is characterized by a lack of fixed-gear propulsion.