Front end motor-generator system and hybrid electric vehicle operating method

A front end motor-generator controller for control of a hybrid electric arrangement for an internal combustion engine of a vehicle having an integrated switchable coupling at a front of the engine arranged to selectively engage a front end of an engine crankshaft on an engine-side of the coupling to an engine accessory drive on a drive-side of the integrated switchable coupling, comprising:

• a front end motor-generator control module programmed to
• determine an operating state of the vehicle based on operating state information received from at least one of a vehicle sensor and another controller of the vehicle;
• determine from the determined operating state a current operating priority, wherein the current operating priority is one of:
• meeting a safety requirement, the safety requirement including at least a requirement to maintain a first amount of stored compressed air for safe operation of a pneumatic brake system of the vehicle,
• meeting an energy store requirement, the energy store requirement including at least a requirement to maintain a state of charge of an energy store above first state of charge level,
• meeting an engine operating requirement, the engine operating requirement including at least a requirement to maintain an engine operating parameter within an operating limit, the engine operating parameter including at least an engine coolant temperature, and
• meeting a driver comfort requirement, the driver comfort requirement including at least a requirement to maintain a climate condition of a passenger compartment of the vehicle in a desired temperature range;
• select an operating mode of the hybrid electric arrangement based on the determined current operating priority, wherein the determined operating mode is one of a plurality of motor-generator operating modes, the plurality of motor-generator operating modes including at least one of an electrical energy generating mode, an engine accessory drive torque generating mode, a supplemental engine torque generating mode, and an idle mode;
• and
• control operation of the motor-generator and the integrated switchable coupling to implement the selected operating mode, including commanding the integrated switchable coupling into one of an engaged state in which torque is transferable between the motor-generator and the crankshaft, and a disengaged state in which the motor-generator is disengaged from the crankshaft and torque from the motor-generator is transferable to the drive-side of the integrated switchable coupling to drive the engine accessory drive to drive at least one engine accessory.