An exhaust gas treatment system comprising a first and a second structure being in fluid communication and defining a flow path of the exhaust gases, the second structure being supported by the first structure, the first structure comprising a first catalytic converter downstream a mixing chamber, the first catalytic converter having a fluid connection to an outlet of exhaust gases, the second structure including a filter unit housing removably connected to the first structure and to an inlet module by a filter unit housing fixing, the second structure defining a longitudinal axis, the filter unit housing including a filter unit, and the inlet module including a second catalytic converter and having a fluid connection to an inlet of exhaust gases, the filter unit housing and/or the inlet module being configured to allow its removal from the exhaust gas treatment system.

An ozone supply device includes an ozonizer, a blower and a housing while the housing serves as an intake duct member. The ozonizer includes electrodes that generate ozone through electric discharge. The blower includes a suction inlet, through which air is drawn, and a discharge outlet, through which the air drawn from the suction inlet is discharged. The blower supplies the air discharged from the discharge outlet to the electrodes and blows the ozone generated through the electric discharge to an exhaust passage. The housing forms a suction air passage that guides the air to the suction inlet. At least a portion of the ozonizer is placed in the suction air passage.

A contaminant reducing device is provided. The contaminant reducing device comprises: an exhaust gas tube for supplying exhaust gas from a combustion engine; a cleaning water supply tube for supplying cleaning water; a scrubber for spraying cleaning water, which is supplied through the cleaning water supply tube, to exhaust gas supplied through the exhaust gas tube; an oxidation unit connected to the exhaust gas tube so as to oxidize the exhaust gas by discharging electricity, emitting ultraviolent rays, or spraying an oxidizer; and a cleaning water discharge tube for discharging cleaning water from inside the scrubber.

An exhaust gas filter for purifying exhaust gases including particulate matter discharged from an internal combustion engine includes a honeycomb structure whose axial direction matches an exhaust gas flow, a plug portion which selectively plugs upstream end faces of the honeycomb structure which faces the exhaust gas flow, and catalyst carried on the honeycomb structure. The honeycomb structure has a plurality of partition walls and cells surrounded by the partition walls, and pores formed inside partition walls between adjacent cells communicating with each other. The plurality of the cells have open cells which are penetrated in the axial direction and plugged cells having one upstream end which face the exhaust gas flow plugged by the plug portion. The honeycomb structure has a first region which does not carry the catalyst on the partition walls and a second region which carries the catalyst on the partition walls.

Provided is a method for detecting abnormality of an after turbo catalyst (ATC) where fuel from a fuel injection device receiving a post injection command from a controller undergoes oxidation reaction in an exhaust pipe and resultant reaction heat heats the exhaust gas, which provides an ATC-entry-side temperature measuring means measuring a temperature on an entry side of ATC to transmit a measured value to the controller and an ATC-downstream-side temperature measuring means measuring a temperature downstream of ATC. The controller, which transmitted the post injection command, determines whether a fuel injection device normally operates if temperature downstream of ATC is not nonelevated to that on the entry side of ATC, and determines that ATC has abnormality if the fuel injection device normally operates.

An exhaust aftertreatment system includes a first stage catalytic converter, a second stage catalytic converter, and a conduit extending from the first stage catalytic converter to the second stage catalytic converter. The conduit passes through an exhaust gas intercooler, between the first and second stage catalytic converts, that reduces the temperature of the exhaust to about 300 F. to about 500 F. Air is ejected into the exhaust conduit to increase the oxygen concentration in the exhaust before it passes through the second stage catalytic converter. The air can be ejected from an air ejection conduit that extends to an engine charger compressor or a compressed air conduit that extends from the engine charger compressor, such as a turbo charger and/or a supercharger, to the engine. A gas particulate filter can be disposed in the exhaust conduit or it can be integrated with the second stage catalytic converter, for example as a catalyzed gas particulate filter.

Exhaust generated from an internal combustion engine includes particulates and gas-phase volatile hydrocarbon condensables. The exhaust is cooled in an exhaust gas cooler from a first temperature to a second temperature such that a first portion of the gas-phase volatile hydrocarbon condensables in the exhaust condense to the liquid phase and a second portion of the gas-phase volatile hydrocarbon condensables in the exhaust condense on black carbon particles to form semivolatile brown carbon particulates. Some or all of the liquid-phase volatile hydrocarbon condensables and the semivolatile brown carbon particulates are trapped in a gasoline particulate filter or a catalyzed gasoline particulate filter located downstream of the exhaust gas cooler.

Systems and methods are provided for feedgas diagnostics in a selective catalytic reduction (SCR) system. An example electronic system may be part of on-board diagnostic (OBD) functionality in a diesel fuel vehicle and may comprise circuits for defining and managing system conditions for hydrocarbon dosing, adjusting the dosing to a diesel oxidation catalyst (DOC) while the system is in operation, and defining a diagnostic framework based at least on exothermic properties of various components of a DOC such that a DOC may be monitored for failure and/or end of useful life (EUL). The electronic system may include a tuning circuit for calibrating the diagnostic framework.

A catalyzed particulate filter may include at least one inlet channel extending in a longitudinal direction, and having a first end into which fluid flows and a second end which is blocked; at least one outlet channel extending in a longitudinal direction, and having a first end which is blocked and a second end through which the fluid flows out; at least one wall that defines the boundary between adjacent inlet and outlet channels and that extends in a longitudinal direction; and at least one support positioned within at least one of the at least one inlet channel and the at least one outlet channel.

An arrangement of an internal combustion engine with at least one first and one second nitrogen oxide storage catalytic converter is provided, wherein the first nitrogen oxide storage catalytic converter is arranged within a low-pressure exhaust gas recirculation circuit. A method for operating the arrangement is furthermore provided, wherein the nitrogen oxide storage catalytic converters can be used for the production of ammonia under operating conditions with a high load by providing rich exhaust gas conditions.