Optimal source electric vehicle heat pump with extreme temperature heating capability and efficient thermal preconditioning

A vehicle thermal management system comprising:

• a vehicle heat pump system including a compressor, a cabin condenser, a cabin evaporator, a cabin blower, and a chiller;
• control electronics configured to, based upon at least an ambient temperature and a cabin temperature, control the compressor to operate:
• during a first time interval, in an efficient mode;
• and
• during a second time interval, in a lossy mode in which the compressor generates a greater amount of heat than when in the efficient mode,
• wherein the cabin evaporator and the cabin condenser are configured in at least one heating mode to operate concurrently.

A vehicle thermal management system comprising:

• a vehicle heat pump system including a compressor, a cabin condenser, a cabin evaporator, a cabin blower, and a chiller;
• a battery system coolant loop in thermal communication with a battery system and with the chiller;
• and
• control electronics configured to, based upon at least an ambient temperature, a cabin temperature and a battery system temperature:
• in a first operational mode, operate the compressor in an efficient mode to transfer heat from a source to the battery system;
• and
• in a second operational mode, operate the compressor in a lossy mode to generate heat and to transfer the generated heat to the battery system,
• wherein the lossy mode of the compressor includes a plurality of sub-modes of differing loss characteristics producing respective amounts of heat.