Heat exchange – With timer – programmer – time delay – or condition responsive... – Having heating and cooling capability
Patent
1995-12-22
1997-12-23
Ford, John K.
Heat exchange
With timer, programmer, time delay, or condition responsive...
Having heating and cooling capability
165265, 165 42, 165 43, 34082578, 34087038, F25B 2900, H04Q 900
Patent
active
056998570
ABSTRACT:
An automotive heater, ventilation and air conditioning (HVAC) control system reduces overall system cost and improves system reliability by reducing the number of wire interconnects between the climate control head and the multifunction body control module. Wire reduction from as many as seven to as few as one is possible with the inventive resistively multiplex system. The inventive system combines rear defrost, airconditioning on/off and a set of mode door drive motor select signals within a single climate control head. The inventive climate control head includes a series of resistors and switches that effectively allow a vehicle user to select the various modes of HVAG system operation. The climate control head effectively combines the various possible mode signals into one analog signal that varies according to the selected mode. The single analog signal is fed into a single analog-to-digital port in the multifunction control module. The multifunction control module operates on the internally converted digital signals and responsively controls the HVAC system.
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Dahl Michael A.
Flaishans Gary B.
Rudzewicz Robert G.
Chrysler Corporation
Ford John K.
Fuller III Roland A.
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