Cummins Inc.

Cummins Engine Company, Inc.

Paul R Miller

Josh S Shao

Chuan He

Long K Hwang

Stephen J Charlton

Thomas Dollmeyer

Salim A Jaliwala

Michael J Ruth

Yue Yun Wang

John Franklin Wright

Larry J Brackney

Rod Radovanovic

Bruce G Bunting

Bradlee J Stoia

S Arvind Suresh

Samuel C Geckler

Michael J Cunningham

Bradlee J Stroia

Philip M Dimpelfeld

Lyle E Kocher

George A Brunemann

James C Clerc

Eric K Bradley

Gary L Hunter

Glen T Haegele

Walter J Hough

Wole C Akinyemi

Long-Kung Hwang

Louis C Broering

Wei Lu

George G Zhu

John R Gladden

Kevin M Otto

Lary J Brackney

Chaun He

Mike Barbieri

One embodiment is a system including a controller operable to control fuel injection events. The system is operable in a base mode, and at least one of a deNOx mode, a deSOx mode, and a deSoot mode. The base mode includes a pilot injection pulse, a main injection pulse, a post injection pulse, and a second post injection pulse. The deNOx mode includes a pilot injection pulse, a main injection pulse, and a post injection pulse. The deSOx mode includes a pilot injection pulse, a main injection pulse, a post injection pulse, a second post injection pulse, and a third post injection pulse. The deSoot mode includes a pilot injection pulse, a main injection pulse, a post injection pulse, a second post injection pulse, and a third post injection pulse. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the following description and drawings.

Flexible fuel injection for multiple modes of diesel engine exhaust aftertreatment

One embodiment is a method including providing an exhaust aftertreatment system including an adsorber, commanding rich operation wherein the adsorber is provided with increased reductant, and ending rich operation upon the first of a commanded rich operation threshold being met or a confirmed rich operation threshold being met. Other embodiments include additional methods, software, apparatuses and systems. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the following description and drawings.

Dynamic rich time capability for aftertreatment systems

A system for controlling the temperature of a particulate filter coupled to an exhaust outlet of an internal combustion engine includes a controller responsive to volumetric flow and temperature of exhaust gas to determine a filter regeneration parameter. In a hybrid electric-engine vehicle application, various control strategies are implemented as a function of the regeneration parameter to control exhaust gas temperature suitably for proper regeneration of the particulate filter. Such strategies include shifting the duty cycle of the engine toward lower engine speed operation along lines of constant power output, modifying the ratio of electrical power and engine power and controlling recharging of the battery supplying electrical energy to the vehicle's electric drive motor under vehicle deceleration conditions. In vehicle applications including a transmission coupled directly to the engine, shift points of the transmission are modified as a function of the regeneration parameter to control exhaust gas temperature.

System for controlling particulate filter temperature

A system is disclosed for estimating the mass flow of recirculated exhaust gas (EGR) from an exhaust manifold to an intake manifold of an internal combustion engine via an EGR conduit disposed therebetween and a fraction of EGR attributable to a mass of charge flow entering the intake manifold. An engine controller is responsive to current values of various combinations of the engine exhaust temperature (ETE), intake manifold pressure (IMP), differential pressure (&#x394;P) across an EGR valve, and EGR valve position (EGRP) to determine an estimate of EGR mass flow. The controller is further operable to estimate EGR fraction as a function of the estimated EGR mass flow value, mass flow of charge entering the intake manifold, and engine speed.

System and method for estimating EGR mass flow and EGR fraction

A temperature compensation system for minimizing sensor offset variations includes an engine controller having stored therein a model of sensor operating behavior over temperature. In one embodiment, the sensor is a &Dgr;P sensor for sensing a differential pressure across a flow restriction mechanism disposed between an exhaust manifold and an intake manifold of an internal combustion engine. In this embodiment, the &Dgr;P sensor is preferably thermally coupled to a structural component of the engine whose operating temperature is readily discernable; e.g., the engine cooling system. Alternatively, the &Dgr;P sensor may include a temperature sensor coupled thereto. In either case, the engine controller is preferably responsive to transitions of the key switch to gather &ldquo;hot&rdquo; and &ldquo;cold&rdquo; temperature data under zero &Dgr;P conditions. This information is then used to constantly update the &Dgr;P sensor model.

Temperature compensation system for minimizing sensor offset variations

The present invention relates to an engine diagnostic system for detecting malfunctions in an engine system having a variable geometry turbine exhaust system. The engine diagnosis system includes an electronic control module adapted to periodically initiate a preprogrammed variable geometry turbine diagnostic routine. The diagnostic routine includes the operations of sending a sinusoidal control signal to a pressure regulator, determining the configuration of the variable geometry turbine, determining the pressure of a capsule, calculating the configuration of the variable geometry turbine as a function of the sinusoidal control signal, calculating the pressure of the capsule as a function of the sinusoidal control signal, determining if a pressure sensor is in calibration, determining if the pressure regulator is malfunctioning, determining if the variable geometry turbine position sensor is in calibration, determining if the variable geometry turbine is malfunctioning, and displaying the results of the test.

Automated active variable geometry turbocharger diagnosis system

An equivalence ratio-based system for controlling transient engine fueling includes an engine controller responsive to a number of engine operating conditions to estimate a mass of oxygen trapped within a number of cylinders of an internal combustion engine. The engine controller is further operable to map current values of engine speed and commanded fueling to one of a number of predetermined maximum fuel-to-oxygen, or equivalence, ratio values (&PHgr; ). The engine controller is then operable to determine an oxygen/fuel control (OFC) limited fueling command (F ) as a function of the estimated oxygen mass value and the maximum equivalence ratio, and to limit engine fueling based on the OFC limited fueling command F . In one embodiment, the engine controller is operable to fuel the engine according to a minimum of the OFC limited fueling command F and a default fueling command F , although other fuel limiting strategies are contemplated.

Equivalence ratio-based system for controlling transient fueling in an internal combustion engine

A system is provided for estimating engine exhaust temperature in accordance with an exhaust temperature model based on a number of engine operating parameters. In one embodiment, the engine exhaust temperature model is based on current values of engine speed, intake manifold temperature, mass charge flow, default fuel command parameters, and a first set of model constants. In an alternative embodiment, the engine exhaust temperature model is based on current values of engine speed, intake manifold temperature, intake manifold pressure, mass charge flow, default fueling parameters, and a second set of model constants including a lower heating value of fuel constant.

System for estimating engine exhaust temperature

A system for diagnosing fault conditions associated with an air handling system for an internal combustion engine includes an air handling control mechanism responsive to a mechanism command to control fluid flow through an air handling system of an internal combustion engine. An engine controller is configured to compute predicted responses of a number of engine operating parameters each as a different function of the mechanism command, and to compute a corresponding number of correlation coefficients each as a function of one of the engine operating parameter signals and a corresponding one of the predicted responses. The controller is operable to diagnose a fault associated with the air handling control mechanism if at least some of the correlation coefficients are below a first threshold, and to diagnose a properly functioning air handling control mechanism if at least some of the correlation coefficients are above a second threshold.

System for diagnosing fault conditions associated with an air handling system for an internal combustion engine

A system for decoupling EGR flow and turbocharger swallowing capacity/efficiency control mechanisms includes a multiple-input multiple-output (MIMO) transform manager coupled to one or more of an EGR valve, an exhaust throttle and a variable geometry turbocharger (VGT) actuator of an internal combustion engine. The MIMO transform manager is responsive to commanded charge flow and EGR fraction parameters to decouple the EGR/exhaust throttle and VGT control parameters such that these control mechanisms may be controlled individually and independently of each other. One transform output is provided to a first compensator for controlling EGR flow and/or exhaust throttle operation as a function of charge flow error. The other transform output is provided to a second independent compensator for controlling VGT operation also as a function of charge flow error. Both compensators are configured to provide for transient compensator gain adjustment based on the degree of charge flow error, and the VGT compensator is further configured to provide for transient compensator gain adjustment based on a ratio of commanded fueling and oxygen/fuel ratio. The resulting control strategy provides for independent control of EGR flow/exhaust throttle and a VGT actuator, thereby resulting in better and more consistent control over mass charge flow.

System for decoupling EGR flow and turbocharger swallowing capacity/efficiency control mechanisms

In an internal combustion engine having an exhaust gas recirculation system, a mass airflow (MAF) sensor is disposed at the air inlet to an engine cylinder. For engines with an EGR recirculation path, the sensor is upstream of that path. The MAF sensor provides signals to an engine control module (ECM) indicative of the mass airflow of the intake charge to the engine. A system and method for on-line self-recalibration of the MAF sensor and the MAF values includes comparing the sensed MAF value with an ideal MAF value obtained using data from sensors downstream from the MAF sensor. If a comparison of the sensed versus the actual MAF values reveals that the MAF sensor is out of calibration, a regression analysis is applied to several data pairs of MAF sensor output magnitude and ideal MAF value to modify the relationship between MAF sensor output and sensed MAF value.

On-line self-calibration of mass airflow sensors in reciprocating engines

A system and method is provided for controlling noxious emissions, such as NOx, from an internal combustion engine. The invention utilizes a closed loop and an open loop control algorithm to control one or more compensating levers, each compensating lever corresponding to a controllable engine operating parameter that when changed yields a change in the NOx emissions. In the closed loop control approach, the mass flow rate of the NOx is compared to a predetermined threshold to obtain a delta value. This delta value is applied through a PID controller to generate a corresponding change in one or more compensating levers. In the open loop portion, predetermined relationships are generated between one or more compensating levers and changes in a measure of the noxious emissions. Current values for one or more of the levers are compared against nominal values, and the change in these values are evaluated using predetermined relationships to produce a number of NOx delta values. These NOx delta values can be combined into a composite delta value that is applied to the inverse of the predetermined relationship for one of the compensating levers to determine a change command for that lever.

Emission control in an automotive engine

An exhaust gas recirculation and control system is provided for an internal combustion engine, wherein a portion of engine exhaust gas flow is recirculated through an EGR duct to engine intake air. The recirculated exhaust gas is pumped through the EGR duct by an EGR compressor driven by a dedicated EGR drive that is independently controllable. Because the EGR drive is independently powered and controlled, the EGR flow rate capacity of the system is not dictated by, or limited, by factors such as engine exhaust flow rate. A controller modulates power delivery to the drive means in response to at least one operating condition parameter in order to achieve a desired EGR flow rate. In order to further optimize efficiency, the EGR compressor is preferably a discrete displacement pump which is controllably drivable in a pulse-capture mode, wherein each intake of the EGR compressor is timed synchronously with exhaust pulses in the exhaust manifold.

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Columbus, IN, United States of America

Paul R Miller