Coolant control method and apparatus for vehicle air conditionin

Details Coolant control method and apparatus for vehicle air conditionin Coolant control method and apparatus for vehicle air conditionin

1994-09-23

1996-06-25

Ford, John K.

Heat exchange

Regenerator

Checker brick structure

165 42, 165 43, 165 14, 237 123A, 237 123B, 318626, F25B 2900, B60H 102

Patent

active

055291120

ABSTRACT:
A coolant shutoff valve is closed when a motor-operated temperature door is moved to full cold position to prevent heating of air due to radiation, conduction, convection, or leakage around the door. The motor moves the door to hot or cold limit positions and remains in a stall condition to maintain such positions. A motor control responsive to operator selected temperature moves the door to such limit positions. A shutoff circuit associated with the motor control senses whether a hot or cold mode is selected and detects from the motor current whether the motor is stalled. When the circuit determines both a cold mode and motor stall current an actuation signal is sent to the shutoff valve.

REFERENCES:
patent: 4246526 (1981-01-01), Phillips
patent: 4326667 (1982-04-01), Murata et al.
patent: 4653689 (1987-03-01), Sakurai et al.
patent: 4815658 (1989-03-01), Hidemitsu et al.

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