System and method for output compensation in flow sensors using pulse width modulation

摘要

A system for monitoring and controlling flow rate of a fluid through a valve is disclosed. The system includes a flow rate sensor to measure the flow rate of the fluid through the valve, and a controller. The controller is configured to receive the measured flow rate from the flow rate sensor, and determine if the measured flow rate is equal to a predetermined flow rate value. The controller is further configured to, in response to a determination that the measured flow rate is equal to the predetermined flow rate value, determine a minimum valve position threshold (x_min). Additionally, the controller is configured to determine a minimum flow rate threshold (y_min) corresponding to x_min, and configured to generate a PWM signal and calculate a corrected flow rate (ŷ_f) using the PWM signal. The controller controls a valve operation using ŷ_f. The PWM signal switches between zero and y_min.