Columbus, OH, United States
Columbus, OH, United States

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.


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Patent
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.


A system, method, and apparatus includes management of coasting during operation of a vehicle equipped with a predictive cruise control system.


Patent
Cummins Inc. | Date: 2017-02-08

Systems, methods and apparatus are disclosed that include an exhaust system and an air source external to the exhaust system that is configured to force additional air into the exhaust stream downstream of the engine and aftertreatment system to help mix cool air with the exhaust. The amount and timing of the mixing of the forced air with the exhaust can be determined by an electronic controller so that mixing air is provided in response to one or more predetermined operating conditions and/or anticipated operating conditions


An internal combustion engine includes a number of cylinders and a controller operably connected to interpret operating parameters related to the operation of the number of cylinders. A cylinder torque adjustment for each cylinder is determined from the operating parameters to provide a torque balancing response that reduces noise, vibration and/or harshness in engine operation.


A system is provided for delivery of diesel exhaust fluid or other reductant to an injector for release into an engine exhaust aftertreatment system. The injector includes a nozzle assembly that thermally shields the diesel exhaust fluid from the exhaust gas temperatures. A diesel exhaust fluid delivery procedure is also disclosed for nozzle cooling prior to operation of the injector for emissions reduction.


Systems, methods and apparatus are disclosed for thermal management of an SCR catalyst in an exhaust aftertreatment system of an internal combustion engine that includes an exhaust throttle but lacks a particulate filter. The thermal management can include interpreting, initiating, and/or completing a thermal management event for the SCR catalyst for removal of contaminants such as hydrocarbons and urea deposits. The thermal management event includes at least one of closing the exhaust throttle and increasing the thermal output of the engine to expose the SCR catalyst to a sufficiently high temperature over a time period that desorbs a sufficient amount of the hydrocarbons and/or removes a sufficient amount of the urea deposits to restore SCR catalyst performance.


Patent
Cummins Inc. | Date: 2017-01-11

One exemplary embodiment is a system comprising a dual-fuel engine structured to selectably combust a first fuel type and a second fuel type, and an electronic control system in operative communication with the dual-fuel engine. The electronic control system is structured to control a transition of the dual-fuel engine from a dual-fuel mode to a single-fuel mode. After initiating the transition from the dual-fuel mode to the single-fuel mode, the control system stops provision of the second fuel type, requires combustion using control parameters configured for the dual-fuel mode until a transition ventilation condition is satisfied, permits non-emergency commanded engine shutdown only if the transition ventilation condition is satisfied.


Patent
Cummins Inc. | Date: 2017-04-05

A system includes an internal combustion engine having a number of cylinders, with at least one of the cylinders plumbed to have a complete recycle of the exhaust gases from the cylinder. The system further includes the completely recycled cylinder having an EGR stroke cycle, and the non-recycled cylinders of the engine having an exhaust stroke cycle. The system includes the EGR stroke cycle being distinct from the exhaust stroke cycle. An amount and composition of the exhaust gases from the recycled cylinder are distinct from the amount and composition of the exhaust gases from the non-recycled cylinders, at least at certain operating conditions of the engine.


Systems, apparatus, and methods are disclosed that include an internal combustion engine having a plurality of cylinders operable by a valve actuation mechanism that opens and closes the intake and exhaust valves during nominal engine operations. In response to engine operations indicating a cylinder deactivation condition, one or more the cylinders is selected for deactivation and operated by combusting an amount of fuel that is effective to limit air flow through the deactivated cylinder(s) so that the air flow and combusted fuel amount are less than during nominal cylinder operations.


An internal combustion engine system includes an engine and an aftertreatment system that is connected to the engine to receive an exhaust flow from the engine. The aftertreatment system includes a contaminant storage catalyst for storing contaminants produced by the engine during cold start and low temperature operating conditions, and a NO_(x )reduction catalyst downstream of the storage catalyst for receiving the contaminants released from the storage catalyst when temperature conditions in the exhaust flow and/or NO_(x )reduction catalyst are above an effective temperature threshold for NO_(x )reduction. A contaminant amount stored on the storage catalyst can be estimated in response to one or more operating parameters to manage a storage capacity of the storage catalyst. A bypass can used to bypass the storage catalyst to preserve storage capacity for a subsequent cold start condition.

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