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A climate control system includes a control head having a warmer/cooler temperature control for providing relative thermal comfort. A thermal comfort rating (TCR) corresponding to a range of passenger cabin temperatures is determined based upon a comfort level selection by an occupant using the cont

A climate control system includes a control head having a warmer/cooler temperature control for providing relative thermal comfort. A thermal comfort rating (TCR) corresponding to a range of passenger cabin temperatures is determined based upon a comfort level selection by an occupant using the control head. A control strategy employs look-up tables corresponding to the TCR to determine the speed of an electric compressor and the position of a temperature control blend door. The strategy provides for a relatively fast ramp down to a minimum compressor speed to improve fuel economy while maintaining a relative level of thermal comfort.

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1. A automatic climate control system comprising: a compressor;a blend door;at least one relative temperature selector; anda controller coupled to the relative temperature selector and configured to: receive input from an ambient temperature sensor, a cabin temperature sensor, and the relative tempe

1. A automatic climate control system comprising: a compressor;a blend door;at least one relative temperature selector; anda controller coupled to the relative temperature selector and configured to: receive input from an ambient temperature sensor, a cabin temperature sensor, and the relative temperature selector corresponding to a relative cabin temperature change request; andoutput compressor speed and blend door position based on ambient temperature, cabin temperature, and the relative cabin temperature change request. 2. The system of claim 1, wherein the controller is further configured to receive a thermal comfort rating (TCR) based at least in part upon the relative cabin temperature change request. 3. The system of claim 2, wherein the controller outputs the compressor speed and blend door position according to the ambient temperature, the cabin temperature, and the TCR. 4. The system of claim 3, wherein the controller is further configured to store a plurality of look-up tables, each corresponding to a different TCR, and access one of the plurality of look-up tables corresponding to the received TCR. 5. The system of claim 4, wherein the compressor speed and blend door position is output by the controller according to the accessed look-up table as a function of the ambient temperature and the cabin temperature. 6. The system of claim 4, wherein each TCR is associated with a range of cabin temperatures. 7. The system of claim 6, wherein current compressor speed and blend door position are maintained when the cabin temperature is within the range associated with the TCR. 8. The system of claim 2, wherein the TCR is further based upon solar load and humidity. 9. A method for operating an automatic climate control system comprising: receiving inputs corresponding to an ambient temperature, a cabin temperature, and a relative cabin temperature change request; andoutputting compressor speed and blend door position based upon the ambient temperature, the cabin temperature, and the relative cabin temperature change request. 10. The method of claim 9, further comprising: receiving a thermal comfort rating (TCR) based at least in part upon the relative cabin temperature request; andoutputting the compressor speed and the blend door position based upon the ambient temperature, the cabin temperature, and the TCR. 11. The method of claim 10, wherein the TCR is further based upon solar load and humidity. 12. The method of claim 10, further comprising: storing a plurality of look-up tables, each look-up table corresponding to a different TCR; andaccessing one of the plurality of look-up tables corresponding to the received TCR. 13. The method of claim 12, wherein the compressor speed and blend door position outputs are selected according to the accessed look-up table as a function of the ambient temperature and the cabin temperature. 14. The method of claim 12, wherein each TCR is associated with a range of cabin temperatures. 15. The method of claim 14, further comprising: maintaining a current compressor speed and blend door position when the cabin temperature is within the range associated with the received TCR. 16. A method for operating an automatic climate control system in a vehicle having a compressor, a blend door, and a control head having at least one relative temperature selector for use by an operator of the vehicle, the method comprising: receiving inputs corresponding to an ambient temperature, a cabin temperature, and a relative cabin temperature change selected by the operator;receiving a thermal comfort rating (TCR) based at least in part upon the relative cabin temperature change, wherein the TCR is associated with a range of cabin temperatures; andoutputting compressor speed to the compressor and blend door position to the blend door based at least in part upon the ambient temperature, the cabin temperature, and the TCR. 17. The method of claim 16, further comprising: storing a plurality of look-up tables, each look-up table corresponding to a different TCR; andaccessing one of the plurality of look-up tables corresponding to the received TCR so that the compressor speed and blend door position are output according to the accessed look-up table as a function of the ambient temperature and the cabin temperature. 18. The method of claim 17, further comprising: maintaining a current compressor speed and blend door position when the cabin temperature is within the range associated with the received TCR.