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Torque Modulation in a Hybrid Vehicle Downshift During Regenerative Braking

  • US 20120265382A1
  • Filed: 04/13/2011
  • Published: 10/18/2012
  • Est. Priority Date: 04/13/2011
  • Status: Active Grant
First Claim
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1. A hybrid electric vehicle powertrain system comprising:

  • an automatic transmission including multiple gear ratios for delivering an output torque to a set of drive wheels; and

    a controller configured to effect a downshift between gear ratios during regenerative braking while maintaining the output torque substantially constant.

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