Dynamic shift scheduling in a hybrid vehicle having a step ratio automatic transmission

A hybrid vehicle comprising:

• an engine;
• an automatic transmission having a torque converter with an impeller and a turbine and selectable step gear ratios;
• a traction motor coupled to the impeller and selectively coupled to the engine by a disconnect clutch;
• and
• a powertrain controller configured to control gear selection with respect to a first shift schedule for each of the selectable step gear ratios as a function of drive demand and vehicle output speed, and a second shift schedule for each of the selectable step gear ratios as a function of engine operating speed and torque and motor operating speed and torque.

A hybrid vehicle, comprising:

• an engine;
• an electric machine coupled by a disconnect clutch to the engine;
• a traction battery coupled to the electric machine;
• an automatic transmission coupled to the electric machine by a torque converter;
• and
• a controller configured to shift the automatic transmission according to a first shift schedule based on drivability and a second shift schedule based on efficient operating speeds of the engine and electric machine.