Pulse controlled solenoid valve
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United States of America Patent
Stats
-
Mar 24, 1987
Grant Date -
N/A
app pub date -
Aug 8, 1984
filing date -
Aug 8, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pulsed controlled solenoid flow control valve suitable for use in a closed vapor cycle air conditioning system is disclosed. A pulsewidth modulated control signal is generated for cyclically opening and closing the flow through the expansion valve. The duty cycle of the pulsed control signal determines the average flow rate through the valve. An exponential response control curve is used in conjunction with an integrator offset to obtain a single set point control operating point for all flow rates through the valve, where a given change in the second superheat of the evaporator produces the same percentage change in flow rate regardless of the flow rate.
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