Abstract: An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passageway, a reduction catalyst, a reductant injector, and a controller. The controller may have a NOX/reductant relationship map, and be configured to receive a first input relating to an amount of NOX within the exhaust passageway upstream of the reduction catalyst, and reference the NOX/reductant relationship map to determine an initial amount of reductant that should be directed into the exhaust passageway based on the first input. The controller may also be configured to receive a second input relating to performance of the reduction catalyst, determine an adjustment to the initial amount of reductant based on the second input, and regulate operation of the reductant injector to direct an adjusted amount of reductant into the exhaust passageway. The controller may further be configured to update the NOX/reductant relationship map based on the determined adjustment.

Abstract: An engine exhaust aftertreatment system including an catalyst-based device configured to reduce an amount of NOx in exhaust gases produced by an engine using reductant stored in the catalyst-based device. The system includes a controller configured to determine a starting quantity of stored reductant in the catalyst-based device at the start of the engine. The starting quantity is based on a shutdown quantity of stored reductant in the catalyst-based device determined at the shutdown of the engine.

Abstract: A system for heating a reducing agent associated with a reducing agent distribution system. The system may include a reducing agent containment device, a distribution device connected to the reducing agent containment device, and at least one heating component associated with the reducing agent containment device. A temperature sensor may be configured to determine a temperature of the reducing agent and may be disposed at least partially within the reducing agent containment device. A pressure sensor may be associated with the distribution device and configured to determine a pressure characteristic of the system. A controller may be configured to receive input from the temperature sensor and the pressure sensor and configured to send input to the at least one heating component based on the input received from the temperature sensor and the pressure sensor.

Abstract: An exhaust control system for use with a combustion engine having a reduction catalyst and a supply of reductant is disclosed. The exhaust control system may have a first sensor located to generate a first signal indicative of an amount of a constituent within the exhaust entering the reduction catalyst, a second sensor located to generate a second signal indicative of an amount of the constituent remaining within the exhaust exiting the reduction catalyst, and a third sensor configured to generate a third signal indicative of an amount of reductant within the supply. The exhaust control system may additionally have a controller in communication with the first sensor, the second sensor, and the third sensor. The controller may be configured to determine a change in an efficiency of the reduction catalyst based on the first and second signals, and diagnose the change in efficiency based on the third signal.

Abstract: An after-treatment component detection system may include an exhaust system configured to include an after-treatment component configured to remove one or more constituents of the exhaust gases. The detection system may include an upstream temperature sensor configured to measure temperature upstream from the after-treatment component, a downstream temperature sensor configured to measure temperature downstream from the after-treatment component, and a controller. The controller may be configured to receive signals indicative of upstream temperature measurements from the upstream sensor and signals indicative of downstream temperature measurements from the downstream sensor and determine an upstream rate of temperature change and a downstream rate of temperature change.

Abstract: A method for transforming machine sensor data between a time domain and a combustion pulse domain is disclosed. The method may include determining a number of pulse events per rotation of a shaft and determining a sampling rate per pulse event. The method may also include sampling one or more sensors at the sampling rate per pulse event. The method also may include transforming the samples into the combustion pulse domain.

Abstract: An exhaust gas recirculation (EGR) system for an engine and a method of operating that system is disclosed. The system has a conduit arrangement for conducting exhaust gas from an exhaust side of the engine to an intake side of the engine, a valve arrangement configured for controlling the amount of exhaust gas to be recirculated and a conduit arrangement for providing intake air to the intake side of the engine. A sensor arrangement is provided and is configured to sense at least one parameter indicative of the humidity of the recirculated exhaust gas and the intake air at the intake side of the engine. A control arrangement is configured to receive a signal from the first sensor arrangement and further is configured to control the valve arrangement in response to a determination by the control arrangement that the first parameter is outside a desired range for low-NOx emission during a subsequent combustion period.

Abstract: A method of controlling an HCCI engine-based power system may include receiving performance information relating to a desired operating state for the HCCI engine-based power system, evaluating operational information associated with a current operating state of the HCCI engine-based power system, and determining one or more control parameter values based on the performance information and the operational information. The method may further include predicting a response of the HCCI engine-based power system based on the one or more control parameter values and determining whether the response satisfies one or more desired performance characteristics associated with the HCCI engine-based power system. If the response satisfies the one or more desired performance characteristics, control of at least one component of the HCCI engine-based power system may be enabled based on the one or more control parameter values.

Abstract: An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passageway, and a reduction catalyst disposed within the exhaust passageway. The exhaust system may also have a first sensor located to generate a first signal indicative of an operational parameter of the reduction catalyst, and a second sensor located to generate a second signal indicative of a performance parameter of the reduction catalyst. The exhaust system may further have an injection device located to inject reductant upstream of the reduction catalyst, and a controller in communication with the combustion engine, the first sensor, the second sensor, and the injection device. The controller may be configured to determine a NOX production of the combustion engine, determine an amount of reductant that should be injected based on the NOX production and the first signal, and adjust the amount based on the second signal.

Abstract: An exhaust gas recirculation (EGR) system for an engine and a method of operating that system is disclosed. The system has a conduit arrangement for conducting exhaust gas from an exhaust side of the engine to an intake side of the engine, a valve arrangement configured for controlling the amount of exhaust gas to be recirculated and a conduit arrangement for providing intake air to the intake side of the engine. A sensor arrangement is provided and is configured to sense at least one parameter indicative of the humidity of the recirculated exhaust gas and the intake air at the intake side of the engine. A control arrangement is configured to receive a signal from the first sensor arrangement and further is configured to control the valve arrangement in response to a determination by the control arrangement that the first parameter is outside a desired range for low-NOx emission during a subsequent combustion period.

Abstract: An engine exhaust aftertreatment system including an catalyst-based device configured to reduce an amount of NOx in exhaust gases produced by an engine using reductant stored in the catalyst-based device. The system includes a controller configured to determine a starting quantity of stored reductant in the catalyst-based device at the start of the engine. The starting quantity is based on a shutdown quantity of stored reductant in the catalyst-based device determined at the shutdown of the engine.

Abstract: A system for heating a reducing agent associated with a reducing agent distribution system. The system may include a reducing agent containment device, a distribution device connected to the reducing agent containment device, and at least one heating component associated with the reducing agent containment device. A temperature sensor may be configured to determine a temperature of the reducing agent and may be disposed at least partially within the reducing agent containment device. A pressure sensor may be associated with the distribution device and configured to determine a pressure characteristic of the system. A controller may be configured to receive input from the temperature sensor and the pressure sensor and configured to send input to the at least one heating component based on the input received from the temperature sensor and the pressure sensor.

Abstract: An after-treatment component detection system may include an exhaust system configured to include an after-treatment component configured to remove one or more constituents of the exhaust gases. The detection system may include an upstream temperature sensor configured to measure temperature upstream from the after-treatment component, a downstream temperature sensor configured to measure temperature downstream from the after-treatment component, and a controller. The controller may be configured to receive signals indicative of upstream temperature measurements from the upstream sensor and signals indicative of downstream temperature measurements from the downstream sensor and determine an upstream rate of temperature change and a downstream rate of temperature change.

Abstract: A method for transforming machine sensor data between a time domain and a combustion pulse domain is disclosed. The method may include determining a number of pulse events per rotation of a shaft and determining a sampling rate per pulse event. The method may also include sampling one or more sensors at the sampling rate per pulse event. The method also may include transforming the samples into the combustion pulse domain.

Abstract: An exhaust control system for use with a combustion engine having a reduction catalyst and a supply of reductant is disclosed. The exhaust control system may have a first sensor located to generate a first signal indicative of an amount of a constituent within the exhaust entering the reduction catalyst, a second sensor located to generate a second signal indicative of an amount of the constituent remaining within the exhaust exiting the reduction catalyst, and a third sensor configured to generate a third signal indicative of an amount of reductant within the supply. The exhaust control system may additionally have a controller in communication with the first sensor, the second sensor, and the third sensor. The controller may be configured to determine a change in an efficiency of the reduction catalyst based on the first and second signals, and diagnose the change in efficiency based on the third signal.

Abstract: An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passageway, a reduction catalyst, a reductant injector, and a controller. The controller may have a NOX/reductant relationship map, and be configured to receive a first input relating to an amount of NOx within the exhaust passageway upstream of the reduction catalyst, and reference the NOX/reductant relationship map to determine an initial amount of reductant that should be directed into the exhaust passageway based on the first input. The controller may also be configured to receive a second input relating to performance of the reduction catalyst, determine an adjustment to the initial amount of reductant based on the second input, and regulate operation of the reductant injector to direct an adjusted amount of reductant into the exhaust passageway. The controller may further be configured to update the NOX/reductant relationship map based on the determined adjustment.

Abstract: An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passageway, and a reduction catalyst disposed within the exhaust passageway. The exhaust system may also have a first sensor located to generate a first signal indicative of an operational parameter of the reduction catalyst, and a second sensor located to generate a second signal indicative of a performance parameter of the reduction catalyst. The exhaust system may further have an injection device located to inject reductant upstream of the reduction catalyst, and a controller in communication with the combustion engine, the first sensor, the second sensor, and the injection device. The controller may be configured to determine a NOX production of the combustion engine, determine an amount of reductant that should be injected based on the NOX production and the first signal, and adjust the amount based on the second signal.