Compensating for water pressure variations in a tempered air sys

Details Compensating for water pressure variations in a tempered air sys Compensating for water pressure variations in a tempered air sys

1990-06-18

1992-02-04

Ford, John

Heat exchange

Regenerator

Checker brick structure

165 39, 165 40, 165 42, 165 43, 237 2A, 237 123B, 236 91F, 318641, 165 31, F25B 2900, B60H 102, G05D 2300

Patent

active

050852671

ABSTRACT:
An automatic control system for regulating the temperature of blower air discharged over a heater core to a vehicle passenger compartment. A thermistor is disposed to sense discharge air adjacent the heater core and provide a temperature signal. An electrical indication is provided of the condition of a servomotor driven valve controlling water flow to the heater core. An electrical reference signal is provided indicative of a user selected relative change of flow discharge air temperature. A signal is provided indicating inlet pressure to the valve controlling flow of liquid to the heater core. The signals are summed; and, the valve servo driven until the sum is zero modulating the valve to maintain the sum at zero for regulating blower air discharge temperature at a constant level.

REFERENCES:
patent: 2277598 (1942-03-01), McCollum
patent: 3032324 (1962-05-01), Fiala
patent: 3122199 (1964-02-01), Byloff
patent: 3183962 (1965-05-01), Steinhagen et al.
patent: 3658244 (1972-04-01), Caldwell
patent: 4058255 (1977-11-01), Linda et al.
patent: 4189093 (1980-02-01), Schnaibel et al.
patent: 4373666 (1983-02-01), Williams
patent: 4417688 (1983-11-01), Schnaibel et al.
patent: 4462541 (1984-07-01), Hansen
patent: 4974664 (1990-12-01), Glennon et al.

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