Control system for automobtle air conditioners
Abstract
Abstract AN AUTOMATIC CONTROL SYSTEM FOR CONTROLLING THE COOLING OR HEATING OUTPUT OF AN AUTOMOBILE AIR CONDITIONER WHICH COMBINES IN VARIOUS PROPORTIONS COOLED AIR FROM AN ENGINE DRIVEN MECHANICAL REFRIGERATION SYSTEM WITH WARM AIR FROM A HEATER THROUGH WHICH ENGINE COOLANT IS CIRCULATED, TO ACHIEVE A CONTROLLABLE AIR TEMPERATURE. AN ACTUATOR POWERED BY ENGINE MANIFOLD VACUUM CONTROLS THE SPEED OF A BLOWER AND POSITIONS A BLEND DOOR WHICH DIVERTS PORTIONS OF COOLED AIR THROUGH THE HEATER, THE DISCHARGE AIR BEING FORMED BY THE MIX OF UNDIVERTED COOLED AIR WITH HEATED AIR. ELECTRICAL SIGNALS REPRESENTING SELECTED, AMBIENT AND IN-CAR TEMPERATURES ARE COMBINED WITH AN ELECTRICAL SIGNAL REPRESENTING THE OUTPUT POSITION OF THE ACTUATOR IN AN AMPLIFIER, THE OUTPUT OF WHICH CONTROLS A TRANSDUCER MODULATING THE VACUUM APPLIED TO THE ACTUATOR, THEREBY PROVIDING CLOSED LOOP AUTOMATIC CONTROL OF THE AUTOMOBILE INTERIOR AIR TEMPERATURE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |