Controlled Regenerative Braking Torque Incrementing in Hybrid Vehicle Downshift
AssigneeFord Global Technologies, LLC
InventorsBernard D. Nefcy, Daniel Scott Colvin, Walter Joseph Ortmann, Marvin Paul Kraska, Mark Steven Yamazaki
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Abstract
A controller and control strategies minimize shift shock in a hybrid electric vehicle during a downshift during regenerative braking by maintaining the transmission input speed substantially linear when the transmission input speed is slowing. The controller and the control strategies control the regenerative braking torque during a downshift occurring during regenerative braking in such a way that the transmission input speed is maintained substantially linear when the transmission input speed is slowing during a torque phase of the downshift.
Claims20
A system comprising:
- a transmission including multiple gear ratios for driving a drive wheel;
- and
- a controller configured to effect a downshift between gear ratios during regenerative braking while maintaining the transmission input speed substantially linear when the transmission input speed is slowing.
A method for a hybrid vehicle powertrain system including a transmission for driving a drive wheel through multiple gear ratios, the method comprising:
- effecting a downshift between the gear ratios during regenerative braking;
- measuring a transmission input speed signal indicative of the transmission input speed;
- and
- maintaining the transmission input speed signal substantially linear while the transmission input speed is slowing during the downshift.
A method in a hybrid vehicle powertrain system including an automatic transmission with multiple gear ratios, the method comprising:
- effecting a downshift between the gear ratios during regenerative braking;
- and
- maintaining the transmission input speed substantially linear while the transmission input speed is slowing during the downshift.
Dependencies are inferred from the claim text.