Vehicle passenger compartment temperature control system with P.

Details Vehicle passenger compartment temperature control system with P. Vehicle passenger compartment temperature control system with P.

1991-12-26

1992-07-07

Ford, John K.

Heating systems

Automatic control

Heat source is a reverse cycle refrigerating system or heat...

237 123B, 165 39, 165 40, 165 42, 165 43, 236 78C, 236 78D, 236 78B, 417292, 417293, F25B 2900, B60H 102, B60H 300

Patent

active

051275767

ABSTRACT:
A system for controlling vehicle passenger compartment comfort. An electronic controller receives input from: (i) a thermistor array sensing blower plenum discharge temperature, (ii) a user movable Level Select Control (iii) a potentiometer sensing the position of a servo driven heater core water valve, (iv) an engine rpm tachometer generator and (v) a blower speed signal. The controller employs proportional-integral-derivative (PID) strategy in a microprocessor to generate a control signal for operating the heater core valve servo motor to maintain the plenum discharge air at a constant temperature irrespective of wide swings in engine rpm/water pump speed or user selector changes in blower speed.

REFERENCES:
patent: 4649709 (1987-03-01), Kagohata et al.
patent: 4974664 (1990-12-01), Glennon et al.
patent: 5085267 (1992-02-01), Torrence

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