Systems and methods for improving injector accuracy

An exhaust aftertreatment system comprising:

• a pump configured to circulate a reagent;
• an injector configured to deliver the reagent into an exhaust stream;
• at least one sensor configured to (i) measure an operating parameter of the aftertreatment system and (ii) output a signal that indicates a value of the measured operating parameter,
• wherein the at least one sensor includes a speed sensor configured to:
• measure a speed of the pump;
• and
• output a speed signal based on the measured speed;
• and
• a control module configured to control the injector based on the signal output by the at least one sensor, wherein the control module includes:
• a correction coefficient determination module configured to generate a correction coefficient based at least on the signal outputted by the at least one sensor;
• an injector control module configured to:
• output an injector signal that indicates whether the injector is actuated;
• receive an injector flow control signal that indicates a target flow rate of the reagent,
• determine a pulse width modulation (PWM) signal based on at least the injector flow control signal, and
• generate an injector control signal that controls actuation of the injector based on at least the correction coefficient and the PWM signal;
• and
• a pump speed storing module configured to:
• in response to the injector signal indicating that the injector is not actuated, store the value of the speed signal as a first speed value, and
• in response to the injector signal indicating that the injector is actuated, store the value of the speed signal as a second speed value.