An exhaust aftertreatment system for an internal combustion engine has an exhaust system having at least one three-way catalyst near the engine, wherein a particulate filter is arranged downstream from the three-way catalyst, preferably in an underbody installation in a motor vehicle. A heated catalyst, which has at least one heating stage that can be heated by means of an electric heating element, is provided upstream from the at least one three-way catalyst and downstream from the particulate filter. The at least one electrically heatable heating stage is supplied with electric power directly from a generator that is operatively connected to the internal combustion engine, so that heating of the heated catalyst takes place essentially independently of the charge status of the vehicle battery.

An engine system and method for operating an engine that includes a particulate filter is described. In one example, soot loading of a green particulate filter is increased to improve efficiency of the green particulate filter. The soot loading of the green particulate filter may be expedited so that by the time a vehicle reaches a customer or testing facility, the green particulate filter may be operating at a desired efficiency level.

An exhaust gas purification apparatus for an internal combustion engine includes a particulate filter, an air fuel ratio sensor to detect an air fuel ratio of exhaust gas at the downstream side of the filter, and a controller configured to: change an air fuel ratio, determine whether an amount of particulate matter (PM) deposited in an interior of a partition wall of the filter is equal to or smaller than a predetermined amount, and estimate a maximum storable oxygen amount of the catalyst from a change of the air fuel ratio of exhaust gas at the time when the air fuel ratio of the exhaust gas is changed, in cases where the amount of PM deposited in the interior of the partition wall of the filter is equal to or smaller than the predetermined amount.

Methods and systems are provided for adjusting a vehicle cabin heating system, based on particulate filter (PF) regeneration prediction. In one example, a method includes predicting an amount of exhaust heat that may be recovered via an exhaust heat exchanger during an upcoming PF regeneration event, and prior to the PF regeneration event, adjusting an amount of electric power supplied to an electric heater of the cabin heating system. The amount of adjustment may be based on the predicted amount of exhaust heat that may be recovered.

An intelligent electronic device (IED) may monitor wet stack residue buildup of a diesel engine. Once the wet stack residue accumulates to a certain amount, the IED may perform a mitigation procedure. Additionally, tracking wet stack residue buildup may allow an IED to attempt to prevent or reduce accumulation of the wet stack residue. The IED may track an operating power level of the diesel engine to estimate the rate of residue buildup.

An engine system and method for operating an engine that includes a particulate filter is described. In one example, soot loading of a green particulate filter is increased to improve efficiency of the green particulate filter. The soot loading of the green particulate filter may be expedited so that by the time a vehicle reaches a customer or testing facility, the green particulate filter may be operating at a desired efficiency level.

A system includes an exhaust aftertreatment system including a particulate filter and a controller. The controller is configured to: receive a particulate filter regeneration event trigger; receive information, the information comprising a temperature regarding the particulate filter; determine the temperature regarding the particulate filter is below a temperature threshold associated with a particulate filter regeneration event; and responsive to determining the temperature regarding the particulate filter is below the temperature threshold, command the engine to operate in a cylinder deactivation mode, whereby at least one cylinder of a plurality of cylinders of the engine is deactivated.

The invention concerns a method for controlling regeneration of an exhaust gas aftertreatment system (7, 8) of an internal combustion engine (4) arranged on a vehicle (1), wherein the vehicle (1) is provided with a control system configured to control the regeneration in at least a first regeneration strategy mode comprising a first set of predetermined actions to be taken for controlling initialization and performance of regeneration processes. The method comprises the steps of: (100)adapting the control system so as to be configured to alternatively control the regeneration in a second regeneration strategy mode, wherein the second regeneration strategy mode comprises a second set of predetermined actions to be taken for controlling initialization and performance of regeneration processes, and wherein the first and second regeneration strategy modes differ from each other in that the first and second set of predetermined regeneration control actions differ from each other; (200)collecting, during operation of said vehicle (1) or of another vehicle, data on an exhaust gas regeneration capability of said vehicle (1) or the other vehicle as a function of time; and (300)evaluating, based on the collected data and the difference between the first and second regeneration strategy modes, whether the first or the second regeneration strategy mode is the most suitable for said vehicle (1) if operating under conditions corresponding to the operational conditions for the vehicle for which data were collected. The invention also concerns a vehicle arranged to be the subject of such a method and to a computer program product, a computer readable medium and a control system related to performance of the steps of the above method.

A work vehicle including a DPF system configured to collect particulate matter contained in exhaust gas from an engine; an SCR system configured to add, to the exhaust gas from the engine, a reductant stored in a reductant storage tank to reduce nitrogen oxide contained in the exhaust gas; and a control unit capable of executing a DPF renewal control whereby particulate matter collected and deposited in the DPF system is burned and removed by using the exhaust gas from the engine and an SCR reference operation restricting control to restrict an operating condition of the engine. The SCR reference operation restricting control is executed when an amount of the reductant stored in the reductant storage tank is a preset amount or less, or when an abnormality occurs in the SCR system. The control unit preferentially executes the DPF renewal control over the SCR reference operation restricting control.

A filter regeneration system for an internal combustion engine, the filter regeneration system including: a calculation unit configured to calculate a minimum oxygen concentration and a minimum nitrogen dioxide concentration at which a passive regeneration reaction, in which carbon in PM accumulated on a filter arranged in an exhaust gas passage of the internal combustion engine reacts with nitrogen dioxide and oxygen to generate carbon dioxide and nitrogen monoxide, occurs based on an amount of the PM accumulated on the filter; and an exhaust gas temperature control unit configured to, in a case where an oxygen concentration and a nitrogen dioxide concentration in exhaust gas on an upstream of the filter are equal to or higher than the minimum oxygen concentration and the minimum nitrogen dioxide concentration, respectively, control a temperature of exhaust gas flowing into the filter within a temperature range in which the passive regeneration reaction occurs preferentially.