Air cylinder controller

Details Air cylinder controller Air cylinder controller

2005-09-13

2005-09-13

Picard, Leo (Department: 2125)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Specific application of pressure responsive control system

C700S282000, C702S098000, C702S138000

Reexamination Certificate

active

06944524

ABSTRACT:
An air flow regulator includes a damper (14) and an air cylinder (20) operatively connected with the damper (14) to adjust a damper setting. A pressure sensor (52) indicates a pneumatic pressure in the air cylinder (20). An air pressure regulator (42) is operatively connected with the air cylinder (20) to pressurize and exhaust the air cylinder (20) responsive to an electrical input (70). The air pressure regulator (42) includes a calibration table (64) associating steady state air cylinder pressure values with regulator shut-off pressure values. Responsive to the electrical input (70) updating a steady-state air cylinder pressure value, the air pressure regulator (42) pressurizes or exhausts the air cylinder (20) until the pressure sensor (52) indicates a pressure corresponding to a regulator shut-off pressure value associated in the calibration table (64) with the updated steady-state air cylinder pressure value, whereupon the air pressure regulator (42) ceases the pressurizing or exhausting.

REFERENCES:
patent: 4720807 (1988-01-01), Ferran et al.
patent: 4901758 (1990-02-01), Cook et al.
patent: 5142483 (1992-08-01), Basham et al.

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