MODIFIED AIRFLOW ALGORITHM WITH COMPENSATION FOR VARIATIONS IN MAIN RESERVOIR AIR PRESSURE AND AMBIENT AIRFLOW

摘要

Data processing system for calculating the flowrate ofair from a pressurized reservoir to an air pressurecommunication line. A pressure sensor is connected to thereservoir to provide an analog signal indicating pressure,which is converted into a digital pressure signal. The systemalso has a sensor connected to pressure ports upstream anddownstream of an orifice, located between the reservoir andthe air pressure communication line. This provides an analogdifferential pressure signal which is converted into a digitaldifferential pressure signal, which is processed to obtain afirst digital flowrate signal. This is combined with thedigital pressure signal to obtain a flowrate correction value,from which a revised flowrate value is obtained. This revisedflowrate value may be sent to an operator of the system, to acontrol system, or to an alarm system.