AGRICULTURAL VEHICLE CAB AUTOMATIC TEMPERATURE CONTROL SYSTEM

摘要

A combine (10) including an improved HVAC control system (28) is disclosed herein. The frame (12) of the combine supports an operator cab (16), a harvesting head (14) and the other operational systems of the combine. The control system includes an operator control (30) and a heat exchanger (68) located in the cab. The control system also includes at least one sensor (110, 112, 114) disposed to sense at least one of an ambient air temperature, a cab air temperature and solar loading, and to produce at least one sensed signal representative thereof. The operator control is configured to produce a set-point signal representative of a desired cab air temperature. An interface circuit is electromagnetically coupled to the valve assembly (62), the operator control, and the at least one sensor. A cooling coil may also be located in the cab, wherein the interface circuit is electromagnetically coupled to the associated coolant compressor (88). The interface circuit produces a temperature differential based upon a comparison of the set-point signal to the at least one sensed signal and applies the electrical control signals to the valve, compressor and blower (85) based upon the temperature differential to achieve the desired cab air temperature and minimize cab air temperature oscillations.