Methods and systems for operating a driveline of a hybrid engine powertrain

A driveline operating method, comprising:

• during an upshift of a transmission from a first gear to a second gear, adjusting an amount of driveline torque absorbed via an electric machine during an inertia phase of the upshift in response to a vehicle stability control parameter;
• charging a battery via the electric machine during the inertia phase of the upshift unless battery state of charge is greater than a threshold, and
• retarding spark of an engine coupled to the transmission in response to battery state of charge greater than the threshold during the upshift.

A driveline operating method, comprising:

• adjusting clutch pressure of a transmission clutch during an upshift in response to a vehicle stability control parameter such that torque delivered to wheels of a vehicle via a driveline does not cause the vehicle stability control parameter to exceed a vehicle stability control threshold, and selecting among truncating engine torque via spark retard and lengthening shift duration responsive to the vehicle stability control parameter, including if a vehicle stability metric is approaching a vehicle stability threshold, the duration of the upshift increases until the vehicle stability metric reaches the vehicle stability threshold, then engine spark timing is retarded, and as a value of the vehicle stability metric is reduced and moves away from a value of the vehicle stability threshold in a direction of increased vehicle stability, the amount of spark retard is decreased and the duration of the upshift may be reduced;
• and
• operating with the selected operation during the upshift.