Abstract: A method of air conditioning system temperature control for a motor vehicle is disclosed. The method includes the steps of measuring an air conditioning compressor discharge pressure and determining if the discharge pressure is greater than a predetermined maximum pressure. The method also includes the step of beginning a forced recirculated air mode if the discharge pressure is greater than the predetermined maximum pressure. The method further includes the steps of determining if the air conditioning system is already in a forced recirculated air mode if the discharge pressure is less than the predetermined maximum pressure, and determining if the discharge pressure is less than a predetermined acceptable pressure if the air conditioning system is already in a forced recirculated air mode. The method still further includes the step of beginning an outside air mode if the discharge pressure is less than the predetermined acceptable pressure.

Abstract: A method is provided for controlling a climate control system having an automatic climate control system and a manual climate control system for an automobile having a convertible top. The method includes the step of detecting whether the convertible top is retracted. A signal indicating whether the convertible top is open is delivered to a climate control unit which includes an algorithm which assists in controlling the mode selection logic based on the results of the detection. The climate control unit creates a mode selection signal based on the results of the algorithm, and sends the mode selection signal to the mode selection logic, the mode selection signal being such that the mode selection actuator actuates the automatic climate control mode when the convertible top is up and the mode selection actuator actuates the manual climate control system when the convertible top is retracted.

Abstract: A system for vehicle climate control comprises a number of sensors probing the speed of the vehicle, the position of climate temperature unit and mode doors, the speed of the fan, ambient and interior temperature, and airflow setting. In a body controller, the probed data are correlated to look-up table values to keep the airflow volume constant and to decrease voltage applied to a fan motor when the speed of the vehicle increases. A method of practicing the climate control implemented in the system comprises a sequence of steps providing sensing a number of parameters, defining and storing in a controller memory a data characterizing relationship between the speed of the vehicle and the other parameters of the system, and correlating the sensed and stored data to maintain the airflow volume substantially constant.

Abstract: An automatic climate control system for the passenger compartment of a motor vehicle includes an ambient temperature sensor, an vehicle-interior temperature sensor, a sunload sensor, a temperature selector by which a vehicle passenger may select a desired interior temperature, and a variable-speed blower fan for directing air into the passenger compartment. The operating speed of the blower fan is controlled by the system control unit so as to achieve the desired temperature within the passenger compartment while otherwise capitalizing on the temperature effects of the exterior environment, i.e., ambient temperature and sunload, to minimize blower fan noise and resultant directed airflow.