Systems and methods for increasing reductant insertion accuracy

A method for delivering a reductant into a selective catalytic reduction system via a reductant injector using a reductant insertion assembly comprising a pump and a pressure sensor, the method comprising;

• receiving predetermined calibration values of the pump corresponding to delivery of a reductant by the pump through a calibration injector, the predetermined calibration values stored on a memory of the pressure sensor;
• determining a desired flow rate of the reductant into the selective catalytic reduction system;
• determining an insertion time of the reductant injector for delivering the reductant through the reductant injector based on the desired flow rate value, a pump operating parameter value of the pump and the predetermined calibration values;
• and
• activating the reductant injector for the insertion time.

A control circuitry for controlling a flow rate of a reductant into an aftertreatment system via a reductant injector, the control circuitry comprising:

• a controller comprising a memory, a processor, and a communication interface, the controller configured to be operatively coupled to a reductant insertion assembly comprising a pump and a pressure sensor including a pressure sensor memory, the pressure sensor memory storing predetermined calibration values of the pump corresponding to delivery of a reductant by the pump through a calibration injector, the controller configured to:
• receive the predetermined calibration values of the pump from the pressure sensor,
• determine a desired flow rate of the reductant into the selective catalytic reduction system,
• determine an insertion time of the reductant injector for delivering the reductant through the reductant injector based on the desired flow rate value, a pump operating parameter value of the pump, and the predetermined calibration values, and
• activate the reductant injector for the insertion time.