Regenerative torque limit control

Patent metadata

Field	Value
Publication number	US-10071724-B2
Application number	US-201615349355-A
Country	US
Kind code	B2
Filing date	Nov 11, 2016
Priority date	Nov 11, 2016
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A vehicle includes a powertrain and at least one controller programmed to, in response to a brake request and a shaft speed associated with a speed of the vehicle achieving a starting speed that is defined by a torque of the powertrain that changes with brake demand at a given shaft speed, reduce a regenerative torque limit that constrains regenerative braking torque over a blend-out duration based on the shaft speed.

First claim

What is claimed is:

1. A vehicle comprising:
a powertrain having a torque converter clutch; and
at least one controller programmed to in response to a brake request, specify a regenerative torque limit based on a shaft speed over a blend-out duration that ends with the clutch unlocking such that a regenerative braking torque applied by a traction motor following the regenerative torque limit decreases according to a blend-out rate that is based on a desired friction brake fill-in rate.

2. The vehicle of claim 1 , wherein the at least one controller is further configured to command a traction motor to apply the regenerative braking torque constrained by the regenerative torque limit over the blend-out duration.

3. The vehicle of claim 1 , wherein the blend-out duration begins when the shaft speed reaches a starting speed that is based on the blend-out rate and a torque of the powertrain at a given shaft speed.

4. The vehicle of claim 3 , wherein the torque of the powertrain changes with brake demand, a capacity of the powertrain, or a vehicle stability limit at a given shaft speed.

Assignees

• Ford Global Tech Llc

Inventors

• Zhao Yanan
• Kuang Ming Lang
• Ford Stuart N
• Nefcy Bernard D
• Mccullough Todd

Classifications

• B60W2710/083

  Torque · CPC title

• B60L15/2009

  for braking · CPC title

• B60Y2300/18125

  Regenerative braking · CPC title

• B60W2520/10

  Longitudinal speed · CPC title

• Y10S903/914

  Actuated, e.g. engaged or disengaged by electrical, hydraulic or mechanical means · CPC title