System and method for varying reductant delivery pressure to aftertreatment systems

A reductant insertion assembly comprising:

• a supply unit comprising a pump that is configured to receive an operating voltage and draw reductant;
• a dosing unit positioned separate from the supply unit, the dosing unit comprising:
• a dosing valve that is configured to receive the reductant from the supply unit and to be activated to provide the reductant;
• and
• a pressure sensor that is configured to sense a first output value of the reductant at the dosing valve;
• and
• a controller configured to:
• provide the operating voltage to the pump;
• receive the first output value from the pressure sensor;
• determine a first insertion pressure based on the first output value;
• store the first insertion pressure;
• after storing the first insertion pressure, determine a second insertion pressure based on the first output value;
• compare the first insertion pressure and the second insertion pressure;
• adjust the operating voltage in response to determining that the second insertion pressure is not within an insertion pressure threshold of the first insertion pressure;
• and
• activate the dosing valve in response to determining that the second insertion pressure is within the insertion pressure threshold of the first insertion pressure.

A reductant insertion assembly for an aftertreatment system having a reductant tank and an exhaust conduit, the reductant insertion assembly comprising:

• a supply unit comprising a pump that is configured to receive an operating voltage and draw reductant from the reductant tank;
• a dosing unit positioned separate from the supply unit, the dosing unit comprising:
• a dosing valve that is configured to receive the reductant from the supply unit and to be activated to provide the reductant into the exhaust conduit;
• and
• a pressure sensor that is configured to sense a first output value of the reductant at the dosing valve;
• and
• a controller configured to:
• provide the operating voltage to the pump;
• receive the first output value from the pressure sensor;
• determine a first insertion pressure based on the first output value;
• store the first insertion pressure;
• after storing the first insertion pressure, determine a second insertion pressure based on the first output value;
• compare the first insertion pressure and the second insertion pressure;
• adjust the operating voltage in response to determining that the second insertion pressure is not within an insertion pressure threshold of the first insertion pressure;
• and
• activate the dosing valve in response to determining that the second insertion pressure is within the insertion pressure threshold of the first insertion pressure.