Controller and method for configuring pump and doser of aftertreatment system

A controller for use in an aftertreatment system that comprises a first doser configured to dose reductant into a first decomposition chamber, a second doser configured to dose the reductant into a second decomposition chamber, and a pump configured to supply the reductant to the first doser, the first doser coupled between the pump and the second doser, the controller configured to be operatively coupled to the first doser, the second doser, and the pump and programmed to:

• cause the pump, the first doser and the second doser to operate in an idle mode in which the pump supplies the reductant from a reductant tank to the first doser at steady state, the first doser and the second doser do not dose the reductant, and the reductant supplied to the first doser and the second doser by the pump is recirculated to the reductant tank;
• while the pump, the first doser and the second doser operate in the idle mode, determine a first speed of the pump required to achieve a predetermined target pressure;
• cause the pump, the first doser and the second doser to operate in a first dosing mode in which the pump supplies the reductant to the first doser, the first doser doses the reductant into the first decomposition chamber at steady state, and the second doser does not dose the reductant;
• while the pump, the first doser, and the second doser operate in the first dosing mode, determine a second speed of the pump required to achieve the predetermined target pressure;
• cause the pump, the first doser and the second doser to operate in a second dosing mode in which the pump supplies the reductant to the first doser, the second doser doses the reductant into the second decomposition chamber at steady state, and the first doser does not dose the reductant;
• while the pump, the first doser, and the second doser operate in the second dosing mode, determine a third speed of the pump required to achieve the predetermined target pressure;
• and
• generate a command to configure the pump, the first doser and the second doser, based on the first speed, the second speed, and the third speed.

A method for use in an aftertreatment system that comprises a doser configured to dose reductant into a decomposition chamber and a pump configured to supply the reductant to the doser, the method comprising:

• causing, by a processor, the pump and the doser to operate in an idle mode in which the pump supplies the reductant from a reductant tank to the doser at steady state, the doser does not dose the reductant, and the reductant supplied to the doser by the pump is recirculated to the reductant tank;
• determining, by the processor, a first speed of the pump required to achieve a predetermined target pressure, while the pump and the doser operate in the idle mode;
• causing, by the processor, the pump and the doser to operate in a dosing mode in which the pump supplies the reductant to the doser, and the doser doses the reductant into the decomposition chamber at steady state;
• determining, by the processor, a second speed of the pump required to achieve the predetermined target pressure, while the pump and the doser operate in the dosing mode;
• and
• generating, by the processor, a command to configure the pump and the doser, based on the first speed and the second speed.

A method for use in an aftertreatment system that comprises a first doser configured to dose reductant into a first decomposition chamber, a second doser configured to dose the reductant into a second decomposition chamber, and a pump configured to supply the reductant to the first doser, the first doser coupled between the pump and the second doser, the method comprising:

• causing, by a processor, the first doser and the second doser to operate in an idle mode in which the pump supplies the reductant from a reductant tank to the first doser at steady state, the first doser and the second doser do not dose the reductant, and the reductant supplied to the first doser and the second doser by the pump is recirculated to the reductant tank;
• determining, by the processor, a first speed of the pump required to achieve a predetermined target pressure, while the pump, the first doser and the second doser operate in the idle mode;
• causing, by the processor, the pump, the first doser and the second doser to operate in a first dosing mode in which the pump supplies the reductant to the first doser, the first doser doses the reductant into the first decomposition chamber at steady state, and the second doser does not dose the reductant;
• determining, by the processor, a second speed of the pump required to achieve the predetermined target pressure, while the pump, the first doser, and the second doser operate in the first dosing mode;
• causing, by the processor, the pump, the first doser and the second doser to operate in a second dosing mode in which the pump supplies the reductant to the first doser, the second doser doses the reductant into the second decomposition chamber at steady state, and the first doser does not dose the reductant;
• determining, by the processor, a third speed of the pump required to achieve the predetermined target pressure, while the pump, the first doser, and the second doser operate in the second dosing mode;
• and
• generating, by the processor, a command to configure the pump, the first doser and the second doser, based on the first speed, the second speed, and the third speed.