Cummins Inc.

General Electric Company

Mert Geveci

Andrew W Osburn

Feng Liu

Michael Haas

Richard E Reisinger

Michael Robert Tidwell

Vivek Anand Sujan

Aleksey Yezerets

Richard J Ancimer

Herman Wiegman

Martin T Books

Axel Otto Zur Loye

Neal W Currier

Govindarajan Kothandaraman

David James

Krishna Kamasamudram

Robert August Kaucic

Richard J Gustafson

Erik L Piper

Jiucai Zhang

Abdul R Ofoli

Donald W Stanton

Ashwin Vyas

Charles Clarence Hicks, Jr

Alok A Joshi

Sam T Liu

Leng Mao

John Lawrence Meyer

An exemplary method includes determining an NHreference target in an exhaust conduit between a first SCR catalyst and a second SCR catalyst. The method includes determining a present amount of NHin the exhaust conduit between the first SCR catalyst and the second SCR catalyst, and determining an NHerror term in response to the NHreference target and the present amount of NH. The method further includes determining an amount of NOdownstream of the second SCR catalyst, and adjusting one of the NHreference target and a reductant doser command in response to the amount of NOdownstream of the second SCR catalyst. The method further includes providing a reductant doser command in response to the NHerror term.

Ammonia sensor control, with NOfeedback, of an SCR aftertreatment system

Systems and methods to sample current measurements in energy storage assets while reducing bias errors such as aliasing are provided. One example current sampling system includes an integrator circuit that receives the current signal as an input and integrates the current signal to output a charge signal. The current signal is indicative of a current at an energy storage asset of an energy storage system. The current sampling system includes a charge signal sampler circuit that samples the charge signal at a charge signal sampling rate. The current sampling system includes a differentiator circuit that receives the samples of the charge signal from the charge signal sampler circuit and differentiates the samples of the charge signal to output an anti-aliased current signal.

Systems and methods to sample current measurements in energy storage devices

A control system for a power plant includes a sensor that measures a rotor surface temperature of a steam turbine rotor, where the temperature is a function of exhaust gasses from a heat source for heating steam to a target temperature. The control system includes a controller coupled to the sensor and configured to compute the target temperature using an inverse process model for steam turbine rotor stress dynamics, and based on a reference steam turbine rotor stress and a feedback steam turbine rotor stress, compute a measured steam turbine rotor stress based on a measured surface temperature of the steam turbine rotor, compute an estimated steam turbine rotor stress using a process model for the steam turbine rotor stress dynamics, and based on the target temperature, and compute the feedback steam turbine rotor stress based on the measured steam turbine rotor stress and the estimated steam turbine rotor stress.

Control system for managing steam turbine rotor stress and method of use

An electronic control system is adapted to control a system including an internal combustion engine and an exhaust aftertreatment system including an SCR catalyst. The electronic control system provides a first dynamically determined weighting factor in response to performing a selected one of a plurality of calculations, determines an operating mode of the engine in response to an engine load and an engine speed, selects one of a plurality of inputs in response to the operating mode of the engine to provide an interpolation weighting factor, the plurality of inputs including the first dynamically determined weighting factor and one or more predetermined weighting factors, utilizes the interpolation weighting factor to interpolate between a first set of combustion control data and a second set of combustion control data to determine a set of combustion control values, and controls operation of the engine using the set of combustion control values.

Mult-mode controls for engines systems including SCR aftertreatment

The present disclosure is directed to a system and method for controlling an energy storage device by more accurately detecting an end-of-discharge voltage of the energy storage device. More specifically, in one embodiment, the method includes determining an end-of-discharge voltage threshold for the energy storage device. Another step includes filtering the end-of-discharge voltage threshold via a filter. The method also includes adjusting a time constant of the filter based on at least one voltage-current condition. Still a further step includes comparing the filtered end-of-discharge voltage threshold and a terminal voltage of the energy storage device. Based on the comparison, the method includes determining a change of state of the energy storage device. Thus, the energy storage device can be controlled based on the change of state.

System and method for detecting battery end of discharge

A cooling fluid flow control system for a turbine section of a steam turbine system and a related program product are provided. In one embodiment, a system includes at least one computing device operably connected to a cooling system. The computing device may be configured to control a flow rate of cooling fluid supplied to a steam turbine system by the cooling system by performing actions including modeling a sensitivity of a wheel space temperature to a change in the flow rate in the form of a piecewise linear relationship, the piecewise linear relationship including a flooded flow rate above which the wheel space temperature becomes insensitive to increased flow rate. The computing device also periodically modifies the flow rate of the cooling fluid supplied to the wheel space of the turbine section to approximate a minimum flooded flow rate based on the measured flow rate and the modeling.

Cooling fluid flow control system for steam turbine system and program product

A controller system includes at least one computing device operably connected to a process having a target value for a variable parameter. The computing device(s) is configured to control the variable parameter by performing actions including: computing an error between the target value and an actual value of the variable parameter. Based on the error, the computing device(s) may calculate a desired gain adjustment of the variable parameter, and a desired mean adjustment of the variable parameter. A correction signal may be created for modifying the process by: in response to the error being positive, creating the correction signal by adding the desired mean adjustment and the desired gain adjustment, and in response to the error being negative, creating the correction signal by differencing the desired mean adjustment and the desired gain adjustment. A related program product may carry out similar functions.

Controller system for variable parameter and related program product

Systems and methods for managing aftertreatment systems that include passive NOadsorption devices and SCR catalyst elements are disclosed. Temperature generation devices upstream of the passive NOadsorption devices facilitate control of the aftertreatment systems to improve fuel economy and NOconversion efficiency.

[object Object]

A system includes an internal combustion engine providing exhaust gases to an exhaust conduit, an aftertreatment system having an SCR catalyst component and disposed in the exhaust conduit. The system further includes a first NHsensing element preferentially sensitive to NHand a second NHsensing element preferentially sensitive to NOin the exhaust conduit. Both NHsensing elements are positioned downstream of the SCR catalyst component. The system includes a controller having a test conditions module that determines whether an NOconcentration downstream of the SCR catalyst component is below a threshold value, an NHdiagnostic module that provides a detection comparison value in response to the NOconcentration, a first signal from the first NHsensing element, and a second signal from the second NHsensing element. The controller includes a sensor condition module that provides an NHsensor condition value in response to the detection comparison value.

Method and algorithm for diagnosing an NH3 sensor in an SCR system using measurements from two channels of the sensor

An example method includes interpreting an NHcomposition value at a position upstream of a selective reduction catalyst (SCR) element fluidly disposed in the exhaust conduit of an engine, interpreting a NOcomposition value at a position downstream of the SCR element, and determining an NHsensor rationality threshold in response to the upstream NHcomposition value. The method further includes determining an NHsensor health value as indicating a sensor failure in response to the downstream NOcomposition value exceeding the NHsensor rationality threshold.

Method and algorithm for performing an NH3 sensor rationality diagnostic

One illustrative embodiment is a method comprising operating an engine and an aftertreatment system by controlling a plurality of charge constituents provided the engine, iteratively perturbating one or more combustion inputs effective to vary operation of the engine, and determining fuel consumption and emissions information at the operating points effective to seek a weighted optimization of multiple parameters including fuel consumption and reductant consumption while also meeting a predetermined NOx emissions criterion. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the description and figures.

Controls for performance optimization of internal combustion engine systems

Systems and methods are provided for determining and controlling an NOto NOratio reference target in an exhaust conduit between a first SCR catalyst and a second SCR catalyst. The method includes determining a present NOto NOratio in the exhaust conduit between the first SCR catalyst and the second SCR catalyst, and providing a reductant doser command in response to a deviation of the present NOto NOratio from the NOto NOratio reference target.

A system and method are disclosed for a selective catalytic reductant (SCR) catalyst with an NHsensor operationally coupled mid-catalyst of the SCR catalyst and a controller in electronic communication with the NHsensor configured to interpret a diagnostic enablement condition of the NHsensor. The controller is configured to control a reductant injector to inject varying reductant amounts over a range of ANR values in response to the enablement condition being satisfied. The controller also is configured to determine a lower bound of estimates of the NHamount at the mid-bed catalyst position for the reductant amounts, and determine an NHsensor fault condition in response to actual sensor outputs and the NHlower bound value.

Diagnostic for a mid-catalyst NH3 sensor

Methods and systems are disclosed for fuel drift estimation and compensation using exhaust oxygen levels and fresh air flow measurements. An actual fueling to the engine cylinders is determined from the exhaust oxygen level and fresh air flow to the internal combustion engine. The actual fueling is compared to an expected fueling based on the fueling command provided to the internal combustion engine. The difference between the actual fueling and expected fueling is fuel drift error attributed to changes or drift in the fuel injection system and is used to correct or compensate future fueling commands for the fuel drift.

Growing community of inventors

Delmar, NY, United States of America

Mert Geveci