Abstract:
A system includes a nitrous oxide (NOx) conversion system configured to treat emissions from a conversion system, and includes a selective catalytic reduction (SCR) catalyst assembly and a temperature sensor disposed upstream of the SCR catalyst assembly to measure temperature of an exhaust before flowing into the SCR catalyst assembly. The NOx conversion system includes a temperature sensor downstream of the SCR catalyst assembly to measure a temperature of a treated exhaust flow after exiting the SCR catalyst assembly and a controller coupled to the SCR catalyst assembly. The controller receives signals representative of the temperatures to generate a first control signal representative of a desired temperature to heat the exhaust to. The controller receives the first control signal to output a second control signal to regulate a temperature of the exhaust upstream of the SCR catalyst assembly via a heating system.
Abstract:
A catalyst system may include a three-way catalyst that may receive exhaust gases from an engine and convert the exhaust gases to first converted exhaust gases. An ammonia slip catalyst may receive the first converted exhaust gases and convert the first converted exhaust gases to second converted exhaust gases. A hydrocarbon oxidation catalyst may receive the second converted exhaust gases and convert the second converted exhaust gases to third converted exhaust gases.
Abstract:
A tangible, non-transitory computer readable medium includes computer instructions stored thereon, the computer instructions, when executed by a processor, cause the processor to retrieve model inputs indicative of mechanical systems data, economic data, contractual data, regulatory data, or any combination thereof, associated with at least one compression system. Furthermore, the instructions cause the processor to retrieve a model that derives an operation schedule for the at least one compression system based on the model inputs. Then the instructions cause the processor to derive an operation schedule for the at least one compression system based on the model inputs and the model, and apply the operation schedule to the at least one gas compression system.
Abstract:
A system includes an exhaust treatment system configured to treat emissions from a combustion engine via a catalyst. The system includes a controller configured to obtain an operating parameter indicating catalyst performance. The controller is configured to determine a deterioration factor indicating deterioration of the catalyst based at least in part on the operating parameter. The controller is configured to determine an adaptation term configured to modify an air-fuel ratio command for the combustion engine to account for the deterioration.
Abstract:
A system includes an exhaust treatment system configured to treat emissions from a combustion engine via a catalyst. The system includes a controller configured to obtain an operating parameter indicating catalyst performance. The controller is configured to determine a deterioration factor indicating deterioration of the catalyst based at least in part on the operating parameter. The controller is configured to determine an adaptation term configured to modify a reductant injection command for the combustion engine to account for the deterioration factor of the catalyst. The controller is configured to generate a signal indicating the adaptation term.
Abstract:
A system includes a nitrogen oxide reduction catalyst fluidly coupled to an exhaust conduit of an engine system. The nitrogen oxide reduction catalyst is configured to reduce nitrogen oxides in an engine exhaust. The system also includes an ammonia oxidation catalyst fluidly coupled to the exhaust conduit downstream of the nitrogen oxide reduction catalyst and configured to reduce ammonia in the engine exhaust. Further, the system includes a reductant injection control system configured to control an injection of reductant into the exhaust conduit, determine a first nitrogen oxide conversion rate of the nitrogen oxide reduction catalyst, determine an ammonia storage value of the nitrogen oxide reduction catalyst, and determine a first temperature of the engine exhaust upstream of the ammonia oxidation catalyst. The reductant injection control system is also configured to increase or decrease the injection of reductant based on the first nitrogen oxide conversion, the ammonia storage value, and the first temperature.
Abstract:
A system includes a controller programmed to monitor an NH3 storage state of a selective catalytic reduction (SCR) catalyst. The controller is programmed to receive signals representative of NH3 and/or NOX concentrations in a fluid both upstream of an inlet and downstream of an outlet of the SCR catalyst, to receive a signal representative of the measured NH3 storage of the SCR catalyst from at least one RF probe disposed within the SCR catalyst, to utilize a model to generate an estimated NH3 storage of the SCR catalyst based at least on the NH3 and/or NOX concentrations in the fluid both upstream and downstream of the SCR catalyst, to compare the estimated NH3 storage to the measured NH3 storage, and to output a control action for the SCR catalyst based at least on the comparison of the estimated NH3 storage to the measured NH3 storage.
Abstract:
A system includes a controller programmed to monitor an oxidation state of a three-way catalyst (TWC) assembly coupled to a combustion engine. The controller is programmed to receive signals representative of oxygen (O2) concentration in a fluid both upstream of an inlet and downstream of an outlet of the TWC assembly, to receive a signal representative of the measured O2 storage of the TWC assembly from at least one radio frequency (RF) probe disposed within the TWC assembly, to utilize a model to generate an estimated O2 storage of the TWC assembly based at least on the O2 concentration in the fluid both upstream and downstream of the TWC assembly, to compare the estimated O2 storage to the measured O2 storage, and to output a control action for the TWC assembly based at least on the comparison of the estimated O2 storage to the measured O2 storage.
Abstract:
A system includes an exhaust aftertreatment system configured to treat emissions from a combustion engine. The exhaust aftertreatment system includes a selective catalytic reduction (SCR) catalyst assembly and at least one radio frequency (RF) probe disposed within the SCR catalyst assembly. A controller is coupled to the exhaust aftertreatment system and utilizes an NH3 storage estimate measured by the at least one RF probe and an NH3 storage estimate determined by an NH3 storage estimate model to output a control action for a reductant injection system. The NH3 storage estimate model utilizes measured concentrations of nitrogen oxides (NOx) in the fluid upstream or downstream of the SCR catalyst and/or measured concentrations of NH3 in the fluid upstream or downstream of the SCR catalyst, and the NH3 storage measurement from the at least one RF probe to determine the NH3 storage estimate.
Abstract:
A system includes a controller configured to determine if a combustion engine is operating under a desired rich fuel condition. The controller is also configured, if the combustion engine is operating under the desired rich fuel condition, to monitor a catalytic activity within an ASC assembly that converts NH3 within treated exhaust gases from the combustion engine into N2 to determine whether the catalytic activity has been deactivated in the ASC assembly.