Abstract: Baffle plate devices, exhaust gas aftertreatment apparatuses, and methods for controlling airflow in exhaust gas aftertreatment apparatuses are disclosed. In some examples, a baffle plate device is mounted within an outlet conduit via which the exhaust gas treated by an exhaust gas aftertreatment apparatus exits to the environment. The baffle plate device impacts the flow path of the treated exhaust gas within the outlet conduit to deflect a portion of the treated exhaust gas toward tips of sensors, which extend into the flow path toward the baffle plate device, in order to mitigate the impact of the recirculation region, improve the flow characteristics (e.g., rate, direction, and/or field) of the treated exhaust gas at the tips, and thereby improve the accuracy of the sensors. By improving sensor accuracy, the disclosed technology advantageously reduces false positives and improves engine performance and emissions compliance.

Abstract: A method for operating a motor vehicle internal combustion engine with an exhaust system branch in which a wall-flow exhaust particle filter is arranged. An amount of ash and an amount of soot accumulated in the exhaust particle filter are continuously determined. An ash increase value characterizing an increase in the amount of ash is determined and if pre-set conditions are present, the operation of the internal combustion engine is changed over to a special operating mode for performing an ash detachment and transportation operation, in which operating variables of the internal combustion engine are set such that, on the exhaust entry side in the exhaust particle filter, a pre-settable minimum exhaust flow speed results at which detachment of ash attached to the channel walls of the exhaust particle filter and transportation of detached ash in the direction of the respective inlet channel end is made possible.

Abstract: A method for operating a motor vehicle internal combustion engine with an exhaust system branch in which a wall-flow exhaust particle filter is arranged. An amount of ash and an amount of soot accumulated in the exhaust particle filter are continuously determined. An ash increase value characterizing an increase in the amount of ash is determined and if pre-set conditions are present, the operation of the internal combustion engine is changed over to a special operating mode for performing an ash detachment and transportation operation, in which operating variables of the internal combustion engine are set such that, on the exhaust entry side in the exhaust particle filter, a pre-settable minimum exhaust flow speed results at which detachment of ash attached to the channel walls of the exhaust particle filter and transportation of detached ash in the direction of the respective inlet channel end is made possible.

Abstract: In a method for the diagnostics of an internal combustion engine exhaust gas system that includes a particle filter, first and second sets of value vectors are determined, each including associated values for absolute pressure upstream and downstream of the particle filter, a differential pressure determined from the values of the absolute pressure, an exhaust gas volume flow through the particle filter, and a temperature of the exhaust gas volume flow. After a temperature-standardization of the pressure values, characteristics for dependence of the pressure values are generated from temperature-standardized values of the first set of value vectors and possibly stored as reference characteristics. By comparing temperature-standardized values for the absolute pressure on the inlet and outlet sides of the particle filter and the differential pressure of the second set of value vectors with reference characteristics, flow anomalies can be determined in the exhaust gas system.

Abstract: In a method for the diagnostics of an internal combustion engine exhaust gas system that includes a particle filter, first and second sets of value vectors are determined, each including associated values for absolute pressure upstream and downstream of the particle filter, a differential pressure determined from the values of the absolute pressure, an exhaust gas volume flow through the particle filter, and a temperature of the exhaust gas volume flow. After a temperature-standardization of the pressure values, characteristics for dependence of the pressure values are generated from temperature-standardized values of the first set of value vectors and possibly stored as reference characteristics. By comparing temperature-standardized values for the absolute pressure on the inlet and outlet sides of the particle filter and the differential pressure of the second set of value vectors with reference characteristics, flow anomalies can be determined in the exhaust gas system.

Abstract: A system and method for controlling an internal combustion engine senses differential pressure across the diesel particulate filter to monitor at least one of soot cake permeability and filter wall permeability as a function of exhaust temperature and mass flow velocity. The system and method preferably respond to both porous wall and soot cake permeabilities to determine when the soot level matches a threshold at which an operator may be warned, or at which a remedial operation may be triggered, or at which a more protective action taken by the engine control module.

Abstract: Method, system, and controller for increasing exhaust gas temperatures through controlled operation of a radiator fan in order to facilitate regeneration of a particulate filter. The method, system, and controller being applicable in systems having an engine which emits exhaust gases having particulates which are captured by the particulate filter.

Abstract: A system for controlling engine air/fuel ratio includes an engine, a compressor having an inlet receiving air. The compressor discharges air to the engine intake. A recirculation path is provided from the compressor discharge to the compressor inlet. A controllable valve is located along the recirculation path. A controller is programmed to control the valve to vary the air flow to the engine intake, thereby controlling the air/fuel ratio. Various applications for the compressor recirculation arrangement are possible.

Abstract: Method, system, and controller for increasing exhaust gas temperatures through controlled operation of a radiator fan in order to facilitate regeneration of a particulate filter. The method, system, and controller being applicable in systems having an engine which emits exhaust gases having particulates which are captured by the particulate filter.

Abstract: Method, system, and controller for determining a temperature set point for use in controlling regeneration of a particulate filter. The method, system, and controller being applicable in systems having an engine which emits exhaust gases having particulates which are captured by the particulate filter.

Abstract: Method, system, and controller for controlling oxygen levels in exhaust gases as a function of soot burn rates of a particulate filter so as to facilitate regeneration of the particulate filter. The method, system, and controller being applicable in systems having an engine which emits exhaust gases having particulates which are captured by the particulate filter.

Abstract: Method, system, and controller for controlling fuel included within exhaust gases to facilitate regeneration of a particulate filter. The method, system, and controller being applicable in systems having an engine which emits exhaust gases having particulates which are captured by the particulate filter.

Abstract: An internal combustion engine includes first and second exhaust paths, and a first NOx adsorber located in the first exhaust path. A flow control valve controls the relative amounts of exhaust gas flowing through the first and second exhaust paths. A first injector injects a reductant into the exhaust gas stream. The injector is located so as to inject the reductant at a location adjacent to the flow control valve to cause mixing of the reductant and the exhaust gas and to allow regeneration of the first NOx adsorber.

Abstract: An internal combustion engine includes first and second exhaust paths, and a first NOx adsorber located in the first exhaust path. A flow control valve controls the relative amounts of exhaust gas flowing through the first and second exhaust paths. A first injector injects a reductant into the exhaust gas stream. The injector is located so as to inject the reductant at a location adjacent to the flow control valve to cause mixing of the reductant and the exhaust gas and to allow regeneration of the first NOx adsorber.

Abstract: A turbocharged internal combustion engine is operated such that the intake manifold pressure generally exceeds the exhaust manifold pressure. A low pressure turbocharger and a high pressure turbocharger are provided in series. An exhaust gas recirculation (EGR) system passively routes a portion of the exhaust gases to the high pressure turbocharger compressor inlet.