Abstract: An aftertreatment (AT) system for an exhaust gas stream of an internal combustion engine may comprise a selective catalytic reduction (SCR) device, a particulate filter (PF) device, a reducing agent injection system configured to inject a reducing agent into the exhaust gas stream at a location upstream of the SCR device. A reducing agent injection rate control system may be embedded in an engine control module and may be configured to calculate and output a reducing agent injection rate signal and to apply the injection rate signal to the injection system to control the amount of reducing agent injected into the exhaust gas stream. Calculation of the reducing agent injection rate signal may involve applying a dynamic weighting factor to predetermined minimum and maximum allowable injection rates to obtain a weighted injection rate based upon operating parameters of the exhaust gas stream and/or the AT system.

Abstract: A mixer element of an exhaust treatment apparatus for an internal combustion engine includes a semi-tube having a closed first end and an open second end. The first end includes a fluid inlet configured for connection to an emission fluid injector of the exhaust treatment apparatus. The semi-tube is configured to induce swirl into an exhaust gas flow across the semi-tube. A plurality of bladed discs are spaced axially apart along a tube axis of the semi-tube. The plurality of bladed discs are configured and positioned to induce a helical component to the exhaust gas flow relative to the tube axis. Each bladed disc includes a plurality of blades extending from a disc hub.

Abstract: A system according to the present disclosure includes a coolant flow request module and a pump control module. The coolant flow request module is configured to determine a coolant flow request based on at least one of (i) an outlet temperature of a compressor disposed upstream of a heat exchanger of a charge air cooler, and (ii) an efficiency of a radiator of the charge air cooler. The pump control module is configured to control an output of a pump based on the coolant flow request. The pump circulates coolant through the radiator of the charge air cooler and through the heat exchanger of the charge air cooler when the pump is activated. The heat exchanger is disposed upstream of an intake manifold of an engine.

Abstract: A system according to the present disclosure includes a coolant flow request module and a pump control module. The coolant flow request module is configured to determine a coolant flow request based on at least one of (i) an outlet temperature of a compressor disposed upstream of a heat exchanger of a charge air cooler, and (ii) an efficiency of a radiator of the charge air cooler. The pump control module is configured to control an output of a pump based on the coolant flow request. The pump circulates coolant through the radiator of the charge air cooler and through the heat exchanger of the charge air cooler when the pump is activated. The heat exchanger is disposed upstream of an intake manifold of an engine.

Abstract: A method and apparatus are disclosed for controlling the operation of an aftertreatment system for a motor vehicle having a Lean NOx Trap and a tail pipe for conveying exhaust gasses from the LNT to the external environment. Values are calculated for a NOx content in the exhaust gasses flowing in the tail pipe and the quantity of NOx stored in the LNT. A DeNOx request index is calculated as a function of these values. A raw threshold value of the DeNOx request index is calculated as a function of a LNT temperature and of an exhaust gas mass flow. A corrected threshold value of the DeNOx request index is calculated as a function of the raw threshold value of the DeNOx request index and of a correction factor. A DeNOx regeneration is initiated when the calculated value of the DeNOx request index is larger than the corrected threshold value.

Abstract: A method and apparatus are disclosed for controlling the operation of an aftertreatment system for a motor vehicle having a Lean NOx Trap and a tail pipe for conveying exhaust gasses from the LNT to the external environment. Values are calculated for a NOx content in the exhaust gasses flowing in the tail pipe and the quantity of NOx stored in the LNT. A DeNOx request index is calculated as a function of these values. A raw threshold value of the DeNOx request index is calculated as a function of a LNT temperature and of an exhaust gas mass flow. A corrected threshold value of the DeNOx request index is calculated as a function of the raw threshold value of the DeNOx request index and of a correction factor. A DeNOx regeneration is initiated when the calculated value of the DeNOx request index is larger than the corrected threshold value.