Controller to maintain a certain set of environmental parameters

Details Controller to maintain a certain set of environmental parameters Controller to maintain a certain set of environmental parameters

1996-09-06

1998-09-22

Joyce, Harold

Ventilation

Workstation ventilator

Covered workbench chamber

454 67, B08B 1502

Patent

active

058106570

ABSTRACT:
A system controller continuously monitors the differential pressure between two environments, and dynamically adjusts an air handling system of the controlled environment to maintain a desired differential pressure setpoint by using a closed loop control methodology. Local and remote users can initialize, configure, monitor, and readjust the differential pressure setpoint as necessary. A differential pressure sensor transmits data to the system controller for processing and analysis. The system controller interfaces to a wide variety of air handling systems by using interchangeable air handling subsystems that plug into the controller. Each subsystem has the necessary hardware interface and software control methodology to easily and transparently enable the system controller to interface with a wide variety of air handling configurations. This flexibility allows the invention to control air handling systems using voltage or current outputs to control solenoid driven valves, dampers, and DC motors; and control air handler subsystems using phase, cycle, and frequency control of AC motors.

REFERENCES:
patent: 4497242 (1985-02-01), Moyer
patent: 4706553 (1987-11-01), Sharp et al.
patent: 5090303 (1992-02-01), Ahmed
patent: 5115728 (1992-05-01), Ahmed et al.
patent: 5187417 (1993-02-01), Minnich et al.
patent: 5215497 (1993-06-01), Drees
patent: 5257958 (1993-11-01), Jagers
patent: 5385505 (1995-01-01), Sharp et al.
patent: 5405291 (1995-04-01), Alcorn et al.

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