Cummins Inc. is a Fortune 500 corporation that designs, manufactures, and distributes engines, filtration, and power generation products. Cummins also services engines and related equipment, including fuel systems, controls, air handling, filtration, emission control and electrical power generation systems. Headquartered in Columbus, Indiana, United States, Cummins sells in approximately 190 countries and territories through a network of more than 600 company-owned and independent distributors and approximately 6,000 dealers. Cummins reported net income of $1.64 billion on sales of $17.3 billion in 2012. Wikipedia.
Cummins Inc. | Date: 2017-04-05
A method is disclosed for determining or diagnosing a reagent dosing system failure to provide sufficient reagent to an exhaust aftertreatment system that includes an SCR catalyst to satisfy a reagent dosing command. The method comprisis: determining a quantity of a reagent to inject with a dosing system over a dosing cycle to treat an exhaust gas in an exhaust system that includes a selective catalytic reduction catalyst, wherein the dosing cycle includes a plurality of dosing periods and a doser on-time and a doser off-time within each dosing period, wherein a predetermined portion of the quantity of the reagent is injected during the dosing on-time of each dosing period; operating the dosing system to inject the quantity of the reagent into the exhaust system during the dosing cycle, wherein operating the dosing system includes controlling a pump of the dosing system with pressure feedback control to maintain an operating pressure of the dosing system when the injector is opened; identifying a diagnostic dosing period from the dosing periods in the dosing cycle; during the diagnostic time period, suspending pressure feedback control of the pump while maintaining a speed of the pump; measuring a pressure drop of the dosing system downstream of the pump during the doser on-time of the diagnostic dosing period; and determining a fault condition of the dosing system in providing the quantity of the reagent in response to the pressure drop measured during the diagnostic dosing period.
Cummins Inc. | Date: 2016-09-09
A reductant delivery system is provided for delivery of reductant to an engine exhaust aftertreatment system that is heated during cold temperature conditions. A heat exchange fluid flows through a heat exchange circuit that provides a flow path from the heat source to the doser, from the doser to the reductant storage tank, and from the reductant storage tank to the heat source. A control valve controls the flow of the heat exchange fluid in the heat exchange circuit so that at least one heat exchange cycle includes a circulation period that increases the temperature of the reductant in the doser and storage tank and a termination period where circulation is stopped until reductant temperature in the doser reaches a lower limit.
Cummins Inc. | Date: 2016-06-23
An aftertreatment system comprises a first bank to receive a first portion of an exhaust gas and a second bank to receive a second portion of the exhaust gas. A first reductant insertion assembly is fluidly coupled to the first bank and a parent controller is communicatively coupled thereto. A second reductant insertion assembly is fluidly coupled to the second bank and a first child controller is communicatively coupled thereto. A third reductant insertion assembly is fluidly coupled to the first bank and a second child controller is communicatively coupled thereto. The parent controller instructs the first reductant insertion assembly to insert reductant into the first bank. The parent controller also instructs the first child controller to command the second reductant insertion assembly to insert reductant into the second bank, and instructs the second child controller to command the third reductant insertion assembly to insert reductant into the first bank.
Cummins Inc. | Date: 2016-09-16
A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.
Cummins Inc. | Date: 2016-06-28
Systems, apparatus, and methods are disclosed that include a divided exhaust engine with at least one pair of primary EGR cylinders and a plurality of pairs of non-primary EGR cylinders. The pair of primary EGR cylinders can be connected to an intake with an EGR system that lacks an EGR cooler. In another embodiment, the cylinder pairs include exhaust flow paths that join in the cylinder head to form a common exhaust outlet for each cylinder pair in the cylinder head that is connected directly to the EGR system or to the exhaust system without an exhaust manifold.
Cummins Inc. | Date: 2016-07-22
Implementations described herein relate to utilizing discrete transient local state space models to modify an output from a steady state NO_(x )estimation model to provide a final estimated NO_(x )value. An engine operating space, defined by a speed and injection quantity map, is subdivided into several discrete local state spaces and a transient model is developed for each discrete state space to output a NO_(x )estimation correction value. The transient models may be a regression model or the transient model may be an empirical map of data values. The NO_(x )estimation correction value modifies a steady state NO_(x )value to calculate the final NO_(x )estimated value. The final NO_(x )estimated value is then output to another component, such as a controller as an input for controlling one or more components of an engine, an aftertreatment system, and/or a diagnostic system.
Cummins Inc. | Date: 2016-02-18
A valve (100) comprises a barrel (104) having a central bore (110), an inlet (112), and an outlet (114, 116), and a spool (120) disposed for motion within the central bore, including a ball tip (128), a metering edge (130), and a bore (132). The spool is moveable between a closed position, wherein the ball tip engages a seat (142) to prevent fluid flow through the inlet and the metering edge is disposed in a lower chamber (148) of the central bore to prevent the fluid flow through the outlet, and an opened position, wherein the tip is spaced apart from the seat to permit fluid flow through the inlet and the spool bore into an upper chamber (154) of the central bore to equalize pressure on the spool, and the metering edge is disposed in a flow path of the outlet to permit fluid flow through the outlet.
Cummins Inc. | Date: 2016-06-15
An inlet flange for an aftertreatment system component comprises a flange body (300) and an inlet deflector assembly (200) to deflect and expand exhaust gas from the inlet (312) outwardly as the exhaust gas flows towards an aftertreatment component (410), such as an selective catalytic reduction catalyst, a diesel particulate filter, and/or a diesel oxidation catalyst. The inlet deflector assembly (200) may include a first deflection member (210), a second deflection member (220), and a third deflection member (230). The first deflection member (210), the second deflection member (220), and the third deflection member (230) are configured to deflect fluid flow outwardly away from a longitudinal axis (350) defined by a flange inlet opening (312).
Cummins Inc. | Date: 2016-06-20
An exhaust aftertreatment system includes a selective catalytic reduction (SCR) catalyst is disposed in an exhaust gas system of an internal combustion engine. A reductant injector is coupled to the exhaust gas stream at a position upstream of the SCR catalyst. A controller is configured to determine an NH3 slip condition and control operation of the exhaust aftertreatment system in response to the NH3 slip condition to improve deNOx efficiency and reduce NH3 slip.
Cummins Inc. | Date: 2016-09-26
Systems and methods for controlling operation of dual fuel internal combustion engines in response to cylinder pressure based determinations are disclosed. The techniques control fueling contributions from a first fuel source and a second fuel source to achieve desired operational outcomes in response to the cylinder pressure based determinations.