Vehicle cabin dehumidification control system

A thermal system for a vehicle, comprising:

• a high temperature coolant loop thermally coupled to a heater core configured for thermal exchange with an airflow into a cabin of the vehicle;
• an air conditioning (A/C) loop having a compressor, a condenser, a first expansion device for a heat exchanger, a second expansion device for a chiller, and a third expansion device for an evaporator;
• wherein the high temperature coolant loop is thermally coupled to the condenser;
• and
• a controller having one or more processors, the controller programmed to perform a window fogging prevention operation comprising:
• receiving a first input indicative of a heater core inlet coolant temperature target;
• receiving a second input indicative of a heater core inlet coolant temperature actual;
• determining, based on the first and second inputs, a first compressor speed necessary to achieve the heater core inlet coolant temperature target at an outlet of the condenser;
• receiving a third input indicative of an evaporator probe temperature target;
• receiving a fourth input indicative of an evaporator probe temperature actual;
• determining, based on the third and fourth inputs, a second compressor speed necessary to achieve the evaporator probe temperature target;
• determining which of the first and second compressor speeds is higher;
• and
• operating the compressor at the higher of the first and second compressor speeds such that (i) a coolant temperature at the heater core reaches a first predetermined target temperature, and (ii) a coolant temperature at the evaporator does not fall below a second predetermined target temperature.