HVAC control using modulated evaporator outlet temperature

A vehicle climate control method comprising:

• selecting a desired temperature;
• determining a blend potentiometer position that is indicative of the desired temperature;
• determining an evaporator temperature that is indicative of at least one of the desired temperature and/or the blend potentiometer position;
• calculating a temperature offset according to at least one of the desired temperature, the blend potentiometer position, and/or the evaporator temperature;
• determining a heater core air temperature;
• and
• calculating a blend door position according to the blend potentiometer position, the evaporator temperature, the temperature offset, and/or the heater core air temperature.

A vehicle climate control system comprising:

• a temperature module that determines a desired temperature;
• an evaporator that cools air to a target temperature that is indicative of the desired temperature;
• a temperature offset module that calculates a temperature offset according to the desired temperature and the target temperature;
• a controller that operates the evaporator according to the desired temperature, the target temperature, and the temperature offset.