Donaldson Comapny, Inc.

Watlow Electric Manufacturing Company

Thermo King Corporation

Umicore Ag & Co Kg

Watlow Electric Manufacturing

Wenzhong Zhang

Wayne M Wagner

Todd R Taubert

Magdi K Khair

Scott H Boehmer

Julian C Tan

Theodore G Angelo

Mike Bange

John T Herman

Eivind Stenersen

Julian A Imes

John R Hiemstra

Josh Kundert

Mary Joanne Lorenzen

Gary Dale Reeves

Timothy L Ricke

Allan T Hovda

Scott Peters

Derek Hiemstra

Edward A Steinbrueck

Erich Albert Lucht

John J Shaw

Greg R Truckenbrod

Karl C C Kharas

Ted J Wiegandt

Jill N Irlbeck

Mike Anderson

Zhixin Jason Hou

John Wiese

Julian Tan

Tan Julian

A heater control module of the present disclosure controls exhaust temperature in an exhaust after treatment system. The heater control module includes a heating mode determination module and a heater operating module. The heating mode determination module is configured to select a desired heating mode from a plurality of heating modes based on an engine load and a status of a component of the exhaust aftertreatment system. The heater operating module is configured to operate an electric heater based on the desired heating mode. The plurality of modes includes at least a passive regeneration heating mode and an active regeneration heating mode. The electric heater is operated in the passive regeneration heating mode to heat an exhaust gas to a predetermined temperature to increase NOgeneration when an engine load is less than or equal to approximately 25%.

Electric heating assisted passive and active regeneration for efficient emission controls of diesel engines

A method of heating an exhaust gas in an exhaust after treatment system includes selecting a heating mode between a plurality of heating modes based on an engine load and a status of a component of the exhaust aftertreatment system. The method further comprises heating the exhaust gas by operating the electric heater in the selected heating mode, and operating the electric heater in a passive regeneration heating mode to heat an exhaust gas to a predetermined temperature to increase NO2 generation when an engine load is less than or equal to approximately 25%.

A method of heating an exhaust gas in an exhaust aftertreatment system by selecting a heating mode between different heating modes based on an engine load and a status of a component of the exhaust aftertreatment system. The method includes heating the exhaust gas by operating the electric heater in the selected heating mode and heating the exhaust gas to reduce an exhaust temperature gradient across the exhaust conduit.

This disclosure relates to a method for controlling a system for regenerating a diesel particulate filter. The method includes monitoring an engine run time that has lapsed since a previous regeneration event. The method also includes monitoring backpressure behind the diesel particulate filter. The method further includes triggering a regeneration flag if the engine run time that lapsed since the previous regeneration event reaches a predetermined time limit and the backpressure exceeds a minimum value.

System and method for regenerating an auxiliary power unit exhaust filter

A method of heating an exhaust gas in an exhaust aftertreatment system including a Diesel Oxidation Catalyst (DOC) and a diesel particulate filter (DPF) is provided. The method includes heating the exhaust gas to a predetermined temperature to increase NOgeneration in the DOC when the DPF is not actively regenerated, and heating the exhaust gas to reduce an exhaust temperature gradient when the DPF is actively regenerated. The exhaust temperature gradient is reduced by providing more heat proximate a wall of an exhaust conduit and less heat proximate a center of the exhaust conduit.

The present disclosure relates to a diesel exhaust treatment device including a catalytic converter positioned upstream from a diesel particulate filter. An electric heater is positioned between the catalytic converter and the diesel particulate filter. A shore station can be used to provide power and combustion air to the diesel exhaust treatment device during regeneration of the diesel particulate filter.

Diesel particulate filter regeneration system including shore station

A system for treating diesel exhaust is disclosed. The system includes a first filter including layers of filtration material positioned between layers of corrugated metallic foil. The metallic foil defines a honeycomb arrangement of longitudinal passageways from an upstream end to a downstream end and also openings for allowing exhaust to pass between adjacent longitudinal passageways of the metallic foil. The filtration material is positioned such that exhaust between the adjacent longitudinal passageways passes through the filtration material. The metallic foil also includes flow diverting structures to divert flow within the longitudinal passageways through the openings. A second filter is positioned downstream from the first filter. The second filter defines a honeycomb arrangement of longitudinal passageways. The longitudinal passages are selectively plugged adjacent upstream and downstream ends to force flow radially through walls between the longitudinal passages of the second filter.

Low temperature diesel particulate matter reduction system

Exhaust treatment device with electric regeneration system

An exhaust system for use with a diesel engine includes a diesel particulate filter configured to capture particulate matter exhausted from the diesel engine, a first sensor operable to detect a particulate matter accumulation level within the diesel particulate filter, and a second sensor operable to detect an ambient temperature of an environment surrounding the diesel particulate filter. The exhaust system also includes a control module electrically coupled to the first sensor, the second sensor, and the diesel particulate filter. The control module is operable to adjust a first regeneration threshold based on the detected ambient temperature. The control module is also operable to initiate regeneration of the diesel particulate filter when the detected particulate matter accumulation level reaches the first regeneration threshold.

System and method to regenerate a diesel particulate filter

A method is disclosed for regenerating a diesel particulate filter without excessively increasing NOemissions. The system includes a fuel delivery device, an oxidation catalyst, and a diesel particulate filter. During a first operational mode, the fuel injection device injects a relatively smaller amount of fuel into the exhaust stream to reduce the capacity of the oxidation catalyst to oxidize NO in the exhaust stream to NO. At a determined time, a second operational mode is initiated where a relatively larger amount of fuel is injected into the exhaust stream and is oxidized within the oxidation catalyst, thereby raising the exhaust temperature sufficiently to combust substantially all of the soot trapped on the diesel particulate filter.

Method for regenerating a diesel particulate filter

A diesel exhaust treatment system is disclosed that includes first and second diesel particulate reduction devices. The first diesel particulate reduction device is located upstream in the exhaust flow and contains an oxidation catalyst coating. The second particulate reduction device is located downstream from the first particulate reduction device and is generally non-catalyzed or lightly catalyzed. Each particulate reduction device comprises a flow-through fabric-type filtration media with substantial internal turbulence. As exhaust gas passes through the catalyzed upstream particulate reduction device, nitric oxide (NO) is oxidized to form nitrogen dioxide (NO), a portion of which interacts with the particulate trapped within the upstream diesel particulate reduction device to regenerate the upstream device. A remaining portion of exhaust gas containing NOenters the downstream diesel particulate reduction device, where an additional portion interacts with the trapped particulate to regenerate the device. The relative volume weighted efficiency of the upstream particulate reduction device and of the downstream particulate reduction device are selected to optimize the overall system particle capture efficiency and backpressure, as well as to balance the amount of NOmade with the amount of NOconsumed so as to minimize NOemissions.

Diesel particulate matter reduction system

A system or method for controlling the delivery of fuel into the transient flow of an exhaust system to control emissions. A mathematical model representative of the exhaust system can be used to determine, based on operating conditions of the exhaust system, a rate of fuel delivery suitable for achieving a desired result. The desired result can be to increase the temperature of a diesel particulate filter to a temperature suitable for regeneration without exceeding a temperature that may damage the diesel particulate filter.

Method of dispensing fuel into transient flow of an exhaust system

Growing community of inventors

Savage, MN, United States of America

Wenzhong Zhang