Patent ID: 7373943
Filing Date: 2008-05-20
Classification: A62B,G05D,Y10S,Y10T

Abstract:
1. A method of controlling a second-stage regulator single air supply line used to supply air to an SCBA facepiece using only an electromechanical actuator, comprising the steps of: determining the facepiece pressure; determining the rate of facepiece pressure change; determining the actual electromechanical actuator voltage; finding the difference said facepiece pressure and a predetermined desired facepiece pressure to obtain an error signal; multiplying said error signal by a fixed gain to obtain a proportional error signal; inverting and multiplying said facepiece rate of pressure change by a predetermined constant to obtain an output; adding said proportional error signal from said inverting and multiplying step to obtain a desired electromechanical actuator voltage; charging or discharging the electromechanical actuator if said actual electromechanical actuator voltage is lower than said desired electromechanical voltage; and charging or discharging the electromechanical actuator if said electromechanical actuator voltage is higher than said desired electromechanical actuator voltage.