In order to suppress deposition of constituent of a reducing agent (dissolved matter) in an exhaust passage of an engine enhancing an elimination rate of NOx even when temperature of an exhaust emission from the engine is low, an exhaust emission purifying apparatus is provided with an electro-generative-heat carrier provided on an upstream side of an injection nozzle that supplies the reducing agent into the exhaust emission on upstream side of a reduction catalyst in an exhaust pipe, the exhaust emission being heated to a temperature equal to or higher than a melting point of the dissolved matter whereby deposition of the dissolved matter on an inner wall surface of the exhaust pipe is suppressed to effectively use the supplied reducing agent for catalytic reduction reaction, even when the exhaust emission temperature is lower than the melting point of the dissolved matter of the reducing agent.

Exhaust emission purifying apparatus for engine

An object of the invention is to provide an exhaust emission control device which eliminates the use of a heat-retention structure using heat-insulating material such as glass wool so as to attain substantial lessening in production cost. A discharge end of a gas gathering chamber is connected to an entry end of a mixing pipe so as to encase the entry end of the mixing pipe and close an opened end face in a required spaced-apart relationship. Moreover, a side surface of the entry end of the mixing pipe adjacent to the discharge side of the particulate filter is formed with an opening; and gas guide passages are formed in the gas gathering chamber by guide fins for tangential introduction of all of the exhaust gas from the discharge side of the particulate filter to the opening. An extra space isolated from the gas guide passages is ensured in the gas gathering chamber as a heat-retention chamber surrounding the entry end of the mixing pipe.

Exhaust emission control device

An exhaust mixer (16) is provided for use in an engine exhaust system (10) downstream from an additive injector (14). The mixer (16) includes eight vanes (20), with four of the vanes (20A) extending from a first side (22) of the mixer (16) and arranged in an equally spaced circumferential array around a central axis (24), and the other four of the vanes (20B) extending from an opposite side (26) of the mixer (16) and arranged opposite from the other four vanes (20A) in an equally spaced circumferential array.

Exhaust Gas Additive/Treatment System and Mixer for Use Therein

An exhaust aftertreatment system comprises an injector for injecting urea water into an exhaust duct, and a denitration catalyst disposed downstream of the injector with respect to a flow of exhaust gas. The exhaust aftertreatment system reduces nitrogen oxides in the exhaust gas by the denitration catalyst while using ammonia produced from the urea water injected from the injector. The urea water is injected along a direction of the flow of the exhaust gas within the exhaust duct, and a porous plate is disposed in multiple stages in a space of the exhaust duct such that droplets of the injected urea water impinge against the porous plate before reaching a wall surface of the exhaust duct. A surface of the porous plate subjected to the impingement of the droplets is arranged to face downstream with respect to the flow of the exhaust gas. Deposition of the urea water is prevented by causing film boiling when the droplets impinge against the porous plate, and the urea water reflected by the porous plate is uniformly dispersed into the exhaust gas. Thus, the urea water is uniformly dispersed into the exhaust gas without increasing a pressure loss of the exhaust gas. The urea water is prevented from depositing on the wall surface and producing a precipitate in the form of a solid.

Exhaust aftertreatment system using urea water

[PROBLEMS] To provide an exhaust gas purification device using urea as a reducer capable of being properly operated, capable of stably detecting the concentration of the reducer and stably supplying the reducer in a cold season, and capable of preventing ammonia gas from being produced in a hot season [MEANS FOR SOLVING PROBLEMS] This exhaust gas purification device of an engine (1) supplies urea water in a storage tank (20) to a reduction catalyst (3) disposed in an exhaust system In the exhaust gas purification device, a concentration detection device (60) is installed in the storage tank (20), and the detected concentration of the urea water is adopted as basic information for controlling the supply of the urea water to the reducer Also, a heating device to heat the reducer in the storage tank (20) and a cooling device cooling the reducer are installed to heat, desirably, the reducer near the detection part (61) of the concentration detection device and the suction port (12) of a reducer supply tube (13)

Exhaust gas purification device of engine

The invention relates to a mixing device for mixing the exhaust gases that flow in an exhaust gas pipe (1) of an internal combustion with a reducing agent and to an exhaust gas purification system comprising a mixing device of this type. According to the invention, a mixing body (12, 112, 132) that can be positioned in the exhaust gas pipe is provided with a gas impact surface (15, 115, 160) and a stream impact surface (14, 114, 161) in such a way that the exhaust gas flowing out of the internal combustion engine strikes the gas impact surface (15, 115, 160) and the reducing agent that can be supplied transversely to the exhaust gas flow strikes the stream impact surface (14, 114, 161). The stream impact surface (14, 114, 160) and the gas impact surface (15, 115, 160) form disjointed sub-sections of the surface of the mixing body (12, 112, 132). The mixing device distributes the reducing agent uniformly over the cross-section of the exhaust pipe and mixes said agent uniformly with the exhaust gas.

Mixing device for an exhaust gas purification system

An exhaust gas purification device comprises a post-treatment unit (50); a unit (45) for introducing an auxiliary agent into the post-treatment unit; and a unit (30) for mixing the exhaust gas with the agent. Preferred Features: The mixing unit contains a screen suitable for producing inhomogeneities in the exhaust gas stream. The screen has a deviating blade through which the exhaust gas flows and by which the gas can be deviated from its flow direction. The blade is arranged to rotate about a conical central region. The post-treatment unit contains a catalyst for the selective catalytic reduction of nitrogen oxides in the exhaust gas. The auxiliary agent is a reductant made from a urea-water solution.

Exhaust gas purification device used for post-treating IC engine exhaust gases comprises post-treatment unit, unit for introducing auxiliary agent into post-treatment unit, and unit for mixing exhaust gas with agent

A method is provided for operating an internal combustion engine in whose exhaust-gas region an exhaust-gas treatment device is situated, and in which a reagent is introduced into the exhaust-gas region of the internal combustion engine. in addition, a device is provided for implementing the method. The reagent pressure occurring between a reagent safety valve and a reagent dosing valve, disposed directly in the exhaust-gas region is recorded during different states of the reagent safety valve and/or the reagent dosing valve and compared to at least one threshold value. If the threshold is exceeded, a fault signal is provided. This may offer high safety which may be of particular importance when fuel is used as reagent.

Method for operating an internal combustion engine and device for implementing the method

Verfahren zum Betreiben einer Brennkraftmaschine (10), in deren Abgasbereich (13) eine Abgasbehandlungsvorrichtung (15) angeordnet ist, bei dem ein Reagenzmittel stromaufwarts vor der Abgasbehandlungsvorrichtung (15) in den Abgasbereich (13) eingebracht wird, bei dem in Stromungsrichtung des Reagenzmittels, das auf einen vorgegebenen Reagenzmittel-Quellendruck (pQRea) gebracht wird, zunachst ein schaltbares Reagenzmittel-Sicherheitsventil (ReaCV), dann ein kontinuierliches Reagenzmittel-Dosierventil (ReaDV) und danach ein Reagenzmittel-Einbringungs-Ruckschlagventil (ReaIV) angeordnet sind, bei dem der Reagenzmitteldruck (pRea) im Reagenzmittelpfad (22) erfasst wird, der zwischen dem Reagenzmittel-Dosierventil (ReaDV) und dem Reagenzmittel-Einbringungs-Ruckschlagventil (ReaIV) liegt, bei dem der in wenigstens einem vorgegebenen Zustand des Reagenzmittel-Sicherheitsventils (ReaCV) und/oder des Reagenzmittel-Dosierventils (ReaDV) erfasste Reagenzmitteldruck (pRea) mit wenigstens einem Schwellenwert (pU, pabg, dpReaIV, pQRea, dpRea/dt, 50) verglichen und bei einer Schwellenuberschreitung ein Fehlersignal (F) bereitgestellt wird.

Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens

The method involves exhaust gas treatment device (15) arranged in the exhaust area (13). A reagent is introduced in exhaust area before the exhaust treatment device, in the direction of flow, with predetermined reagent feeding pressure (pQRea). At first an adjustable reagent safety valve (ReaCV) and thereafter a continuously dosing reagent dosing valve (ReaDV) are arranged. The reagent dosing valve is arranged in the exhaust area whereby the reagent is directly sprayed into the exhaust area by which the reagent pressure is detected in the reagent path (22). The reagent pressure is compared with atleast one threshold value (pU,pabg,dpReaCV,dpRea/dt) and, with exceeding of the threshold value an error signal (F) is generated. An independent claim is also included for the device for operation of internal combustion engine.

Method for operation of internal combustion engine involves exhaust gas treatment device arranged in exhaust area whereby reagent is introduced in exhaust area before exhaust treatment device in direction of flow

Cord Scharsack

Papers

Mixing device for an exhaust gas purification system

Exhaust gas purification device used for post-treating IC engine exhaust gases comprises post-treatment unit, unit for introducing auxiliary agent into post-treatment unit, and unit for mixing exhaust gas with agent

Method for operating an internal combustion engine and device for implementing the method

Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens

Method for operation of internal combustion engine involves exhaust gas treatment device arranged in exhaust area whereby reagent is introduced in exhaust area before exhaust treatment device in direction of flow