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.

Methods and systems are provided for cleaning an exhaust particulate filter by routing air via the exhaust particulate filter during a vehicle-off condition. In one example, during vehicle-off conditions, a turbocharger may be reverse rotated via an electric motor or an engine may be reverse rotated via an electric machine to route air via the exhaust particulate filter and the soot collected from the particulate filter may then be deposited on an air filter coupled to the intake manifold. During a subsequent engine start, the soot from the intake air filter may be routed to the engine cylinders for combustion.

There is provided an exhaust gas cleaning apparatus for cleaning exhaust gas discharged from an internal combustion engine that includes an upstream side exhaust pipe and a downstream side exhaust pipe that are located on an upstream side and a downstream side, respectively, with respect to a flow direction of the exhaust gas discharged from the internal combustion engine. A filter unit is disposed between the upstream side exhaust pipe and the downstream side exhaust pipe and removably connected at opposite sides thereof to the upstream side exhaust pipe and the downstream side exhaust pipe. The filter unit includes a filter that captures particulate matter contained in the exhaust gas flowing in the upstream side exhaust pipe, a casing in which the filter is accommodated, and a thermal insulator that covers an entire outer peripheral surface of the casing. A handle is provided on the thermal insulator.

A propulsion system has an internal combustion engine including an exhaust manifold and an engine air intake, an exhaust port fluidly connected to the exhaust manifold, a fresh air intake fluidly connected to the engine air intake and a filter assembly including adsorbent material and being configurable between a loading configuration allowing for filtration of at least some components of an exhaust gas of the engine, and a purging configuration allowing for removal therefrom of at least some of the components of the exhaust gas. In the loading configuration, the filter assembly is fluidly connected between the exhaust manifold and the exhaust port. In the purging configuration, the filter assembly is fluidly connected between the fresh air intake and the engine air intake. Above a threshold effective engine speed of the engine, the filter assembly is in the purging configuration. A method for treating exhaust gas is also described.

The present invention generally relates to a process and apparatus for cleaning and removing particulate deposits in a particulate filter, in particular for the dry removal of ash deposits with a diesel particulate filter. Compared to the art known procedures, the method of the present invention is based on the provision of a two-stage process including a stage wherein the filter is exposed to a structural resonant frequency under pressure and a stage wherein the filter is exposed to a reverse flow. Combination of a structural resonance frequency with a reverse flow results in an efficient two-stage removal of the debris from the filter without causing any damage to the ceramic body of the filter.

Estimating soot comprises connecting exhaust pipe to engine, exhaust pipe has diesel oxidation catalyst and diesel particulate filter. Fuel injector is connected to exhaust pipe upstream from diesel oxidation catalyst and diesel particulate filter. Delta exhaust pressure sensor measures difference in exhaust pressure at inlet and outlet to diesel particulate filter. Controller is connected to fuel injector and to delta exhaust pressure sensor. Controller determines when to conduct active regeneration of diesel particulate filter based on estimated amount of soot accumulated therein. Controller, in first regeneration mode, causes fuel injector to inject fuel at first rate into exhaust stream, and re-evaluates soot accumulated within diesel particulate filter under increased volumetric flow of exhaust stream. Controller, in second regeneration mode, causes fuel injector to inject fuel at second rate, larger than first rate, into exhaust stream to combust soot trapped in diesel particulate filter.

In order to provide a flow device which is of simple construction and is operable reliably and in an energy-efficient manner, it is proposed that the flow device comprise the following: a plurality of flow segments which each comprise one or more flow bodies and through which a stream of raw gas is arranged to flow for removing impurities in a cleaning mode, wherein the stream of raw gas is arranged to be supplied to the flow segments via a raw gas supply system and wherein a stream of clean gas that has been cleaned by means of the flow segments is removable from the flow segments by means of a clean gas removal system; a regeneration device for regenerating the flow segments, wherein the regeneration device comprises a docking device for establishing a temporary connection between one or more flow segments that are to be regenerated on the one hand and a heating device and/or a flushing device of the regeneration device on the other hand.

A system and method for removing retentate from filters is disclosed, which utilizes pressurized and/or vacuum fluid through localized application. The disclosure describes a cleaning system and sequence of steps for carrying out the cleaning process, whereby, a fluid is directed to flow through a localized region of the filter media, thereby dislodging and removing accumulated retentate from the filter. In addition, the localized application of fluid flow allows for localized monitoring of the cleanliness of the filter with a high degree of spatial resolution. This filter retentate removal system and method is broadly applicable to a wide range of systems and processes ranging to engines and exhaust systems to production plants and equipment.

The invention provides an exhaust purification device capable of suppressing the temporal decrease in NOx catalyst removal efficiency due to soot accumulation. The invention provides an exhaust purification device using an air injection nozzle to inject pressurized air into a casing of a catalyst reactor containing an NOx catalyst as a catalyst and removing soot adhering to the NOx catalyst, wherein it is determined and externally notified that there is abnormal deterioration in the NOx catalyst when the pressure difference P in exhaust between the upstream and downstream sides of the NOx catalyst has increased by at least a first reference pressure difference increase Pt1, which is the allowable amount of pressure difference increase, above the pressure difference Pi in exhaust between the upstream and downstream sides of the catalyst in the initial state at the same exhaust flow rate Ve.

A combined fuel for use in an internal combustion engine comprises a combination of partially combusted particles from the engine exhaust, said particles being in suspension in ordinary fuel. A method and apparatus for recycling partially combusted particulate material by collecting those materials. The particulate materials are combined with ordinary fuel in the fuel system to form the combined fuel which is filtered and fed the engine for combustion.