Reductant insertion assemblies including multiple metering assemblies and a single pump

An aftertreatment system configured to decompose constituents of an exhaust gas produced by an engine, the aftertreatment system comprising;

• a selective catalytic reduction (SCR) system comprising a catalyst;
• and
• a reductant insertion assembly fluidly coupled to the SCR system, the reductant insertion assembly comprising:
• a pump assembly comprising a pump that includes a pump outlet,
• a first metering assembly fluidly coupled to the pump, and to the selective catalytic reduction system at a first location, the first metering assembly comprising a first metering manifold that comprises:
• a first reductant inlet fluidly coupled to the pump outlet,
• a first reductant outlet,
• a reductant transfer outlet, and
• a passage defined through the first metering manifold from the first reductant inlet to the reductant transfer outlet, and
• a second metering assembly fluidly coupled in series with the pump, and to the selective catalytic reduction system at a second location, the second metering assembly comprising a second metering manifold coupled to the first metering manifold, the second metering manifold comprising:
• a second reductant inlet fluidly coupled to the first reductant transfer outlet, and
• a second reductant outlet,
• wherein the second metering assembly is a separate structure from the first metering assembly and the second reductant inlet is removably coupled to the first reductant transfer outlet so as to be in fluid communication with the passage of the first metering assembly, and
• wherein the pump is configured to pump the reductant to the first metering assembly, and to the second metering assembly via the first metering assembly, such that a first reductant pressure in the first metering assembly is equal to a second reductant pressure in the second metering assembly.

A method for inserting a reductant at a plurality of locations in a selective catalytic reduction system of an aftertreatment system, the method comprising:

• providing a reductant insertion assembly comprising:
• a pump assembly comprising a pump that includes a pump outlet,
• a first metering assembly fluidly coupled to the pump, the first metering assembly comprising a first metering manifold that comprises:
• a first reductant inlet fluidly coupled to the pump outlet,
• a first reductant outlet,
• a reductant transfer outlet, and
• a passage defined through the first metering manifold from the first reductant inlet to the reductant transfer outlet, and
• a second metering assembly fluidly coupled in series with the pump, the second metering assembly comprising a second metering manifold coupled to the first metering manifold, the second metering manifold comprising:
• a second reductant inlet fluidly coupled to the first reductant transfer outlet, and
• a second reductant outlet,
• wherein the second metering assembly is a separate structure from the first metering assembly and the second reductant inlet is removably coupled to the first reductant transfer outlet so as to be in fluid communication with the passage of the first metering assembly;
• activating the pump so as to pump the reductant to the first metering assembly, and to the second metering assembly via the first metering assembly, such that a first reductant pressure in the first metering assembly is equal to a second reductant pressure in the second metering assembly;
• determining a reductant outlet pressure downstream of the first metering assembly and the second metering assembly;
• and
• adjusting a pump operating parameter of the pump based on the reductant outlet pressure.