Pressure regulating system for positive shut-off pressure contro

Details Pressure regulating system for positive shut-off pressure contro Pressure regulating system for positive shut-off pressure contro

1990-04-24

1992-08-25

Lall, Parshotam S.

Boots, shoes, and leggings

364558, 7386144, G06F 1520

Patent

active

051424835

ABSTRACT:
A pressure controller rapidly, precisely sets and stabilizes the pressure in a test volume to a target pressure by opening a fast inlet solenoid valve or a fast outlet solenoid valve, and opening a slow inlet solenoid valve or a slow outlet solenoid valve, to rapidly increase or decrease pressure in the manifold. When the pressure has reached a predetermined level, the fast inlet or fast outlet solenoid valve is closed. Then only the slow inlet or slow outlet solenoid valve remains opened to further increase or decrease the pressure to a second predetermined level. Then, based on the present pressure in the manifold and the test volume, a computation is made of the amount of gas needed to be injected into the manifold to increase the pressure to the target pressure. A computation is made of the time duration during which the slow inlet valve and the slow outlet valve must be differentially opened to increase the net amount of gas injected into the manifold and test volume by the computed amount. Initially, a system configuration program is executed in which the test volume is computed and offsets, pressure rate of change, and other variables are computed to compensate for differences in the turn on and turn off response times of the inlet and outlet solenoid valves. The slow inlet solenoid and the slow outlet solenoid valve are differentially opened for that time duration. Operation to decrease manifold pressure to a target valve is entirely similar.

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