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Adjusting motor torque to compensate for uphill and downhill demands during cruise control in hybrid vehicle

  • US 8,740,744 B2
  • Filed: 05/07/2012
  • Issued: 06/03/2014
  • Est. Priority Date: 05/07/2012
  • Status: Active Grant
First Claim
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1. A method for a vehicle having an engine, a traction motor, and a transmission coupled in-series, comprising:

  • controlling engine torque to attempt to maintain a cruise control speed of the vehicle as the vehicle travels uphill; and

    controlling motor torque to maintain the cruise control speed without downshifting the transmission, the motor torque including an initial torque associated with no transmission downshift and an additional torque associated with a commanded transmission downshift.

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