Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1990-01-19
1991-06-18
Bennet, Henry A.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
237 123B, 237 123R, G05D 2300
Patent
active
050243772
ABSTRACT:
A vehicle heating system (10) utilizes transmission fluid from the vehicle transmission (12) as a source for heat exchange in heater core (26). Fan (28) blows the heated air to heater vents in the normal fashion. When the interior of the vehicle reaches a threshold temperature, thermostat (50) detects the threshold temperature and actuates solenoid (46) which in turn actuates valve (44) so that transmission fluid is diverted from transmission output route (24) to input conduit (30) for heating circulation through heater core (26). The fluid is circulated through output conduit (32), check valve (42), portions of transmission output route (24), and finally radiator (20) where the transmission fluid is cooled for another cycle. The transmission fluid is then returned to transmission (12) via transmission input route (22). In preferred forms, the system (10) provides valve (38), tee connector (34) and caps (36,40). Valve (38) is shifted to a second mode so that pressure may be connected to output conduit (32) where cap (40) is removed, such that fluid may be circulated in a direction opposite to the normal heating mode and discharged via the outlet where cap (36) is removed. When optimum cleaning of heater core (26) has been accomplished, the pressure is disconnected, caps (36,40) are reconnected and valve (38) is returned to its normal heating mode.
REFERENCES:
patent: 3996999 (1976-12-01), Termont et al.
patent: 4352456 (1982-10-01), Brandenburg, Jr.
patent: 4728029 (1988-03-01), Griebel et al.
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