Techniques for blending in mechanical friction brakes during decleration for hybrid vehicle with electric motor mechanically coupled to transmission gears

An electrified vehicle, comprising:

• a transmission including multiple shiftable gears, an electric motor coupled for common rotation therewith, and a synchronizer controllable to couple and decouple the transmission from wheels of the vehicle;
• friction brakes;
• a control system including a hybrid control unit (HCP), a brake control unit (BSM) and a transmission control unit (TCM), wherein the HCP functions as a supervisory controller over the TCM and the BSM;
• wherein the HCP is configured to coordinate control among the TCM and BSM to compensate for unavailability of electric motor regeneration torque during an upcoming transmission gear shift, including:
• based on determining the vehicle is in a coast condition, the HCP coordinates with the TCM to set a first level of electric motor regeneration torque in connection with the transmission being in an initial gear, the first level of electric motor regeneration torque being equal to a first level of total braking torque;
• based on a driver braking torque request being received:
• the HCP coordinates with the BSM to determine an amount of driver intended brake torque and the first level of total braking torque is increased by the determined amount of driver intended brake torque to a second level of total braking torque;
• the HCP coordinates with the TCM to raise a level of electric motor regeneration torque from the first level to a second level matching the second level of total braking torque;
• based upon a shift request being communicated by the TCM, the HCP:
• coordinates with the BSM and the TCM to ramp down the second level of electric motor regeneration torque while commanding a corresponding increase in friction brake torque to maintain the second level of total braking torque;
• and
• coordinates with the TCM to execute the upcoming gear shift from the initial gear to another gear of the second sub-transmission;
• wherein the transmission includes a dual clutch transmission having:
• first and second sub-transmissions having respective first and second clutches and first and second synchronizers, the first and second synchronizers being controllable to couple and decouple the respective first and second sub-transmissions from wheels of the vehicle;
• and
• the electric motor being rotationally coupled to the second sub-transmission for common rotation therewith;
• wherein the upcoming gear shift involves a gear of the second sub-transmission, and wherein the first level of electric motor regeneration torque is set in connection with the second sub-transmission being in an initial gear;
• and
• wherein the initial gear and the another gear are both in the second sub-transmission.