Mitsubishi Fuso Truck & Bus Corporation

Nissan Diesel Motor Co., Ltd.

Tokyo Roki Co., Ltd.

Satoshi Hiranuma

Yoshinaka Takeda

Shinichi Saito

Hiroaki Fujita

Yasuko Suzuki

Toru Kawatani

Kenji Kawai

Takeshi Hashizume

Reiko Doumeki

Minehiro Murata

Satoshi Yamazaki

Yoshinori Takahashi

Kihoko Kaita

Ritsuko Shinozaki

Junya Watanabe

Yoshio Nakayama

Shinichi Saitou

Yusuke Horii

Fumio Aoki

Hayato Aizawa

Norihiro Kajimoto

Yuji Mitsui

Goro Iljima

Ristuko Shinozaki

An exhaust purification device for an engine comprises a catalyst device that purifies the exhaust gas of the engine by using an additive; a venturi-shaped mixing chamber that is disposed upstream from the catalyst device and extends from a taper portion with a diameter tapering downstream to continue to a constricted portion with a minimum diameter and then to a flared portion with a diameter that is increased in the downstream direction; a swirl-generating device that is disposed in vicinity of a most upstream section of the taper portion of the mixing chamber and generates a swirling flow in the exhaust gas; and an additive-injection device that is disposed upstream from the constricted portion of the mixing chamber and downstream from the swirl-generating device, and injects the additive into the mixing chamber.

Exhaust purification device for engine

Disclosed is an exhaust purification device for an internal combustion engine provided with a venturi-shaped mixing chamber () upstream of a NOx catalyst (), said mixing chamber () formed continuously from a tapering part () along which the radius decreases in the downstream direction, a waist part () at which the radius is at smallest, and a widening part () along which the radius increases in the downstream direction. A vane plate () and an aqueous urea solution spray nozzle () are arranged inside the tapering part (). The ratio (a/b) of the distance (a) between the vane plate () and the center of the waist part () and the distance (b) between the center of the waist part () and the mouth of the NOx catalyst () is set between 0.5 and 1.0.

Exhaust purification apparatus for internal combustion engine

An exhaust purification apparatus for an engine has a first casing () that is interposed in an exhaust path (); a second casing () that is set downstream of the first casing () and contains an exhaust purification device (); a connecting pipe () that connects the first casing and the second casing () to each other and includes an insertion portion that is inserted in the first casing (); and an injection nozzle () that has a tip end inserted in the connecting pipe () and injects an auxiliary agent from the tip end. The insertion portion of the connecting pipe () is provided with a plurality of through-holes () connecting the inside and the outside of the connecting pipe (), so that the exhaust gas contained in the first casing () is introduced into the connecting pipe () through the through-holes and guided towards the second casing ().

Exhaust purification apparatus for an engine

An ammonia selective reduction-type NOx catalyst () is interposed in an exhaust passage of an engine () provided in a series-type hybrid electric vehicle (), and a urea water injector () is disposed in the exhaust passage to supply a urea water into exhaust gas existing upstream of the ammonia selective reduction-type NOx catalyst (). The engine () is started and stopped in accordance with the storage state of a battery (), and the urea water injector () is controlled in accordance with the operating state of the engine (). When the engine () is to be stopped, an adsorption increasing operation for increasing the amount of ammonia adsorbed by the ammonia selective reduction-type NOx catalyst () is executed over a predetermined period before the engine () is stopped.

Exhaust purification device for hybrid electric vehicle

An exhaust purification apparatus for an engine comprises an upstream casing that has a cylindrical shape and accommodates a particulate filter; an exhaust gas outlet that is formed in a side wall of the upstream casing and discharges the exhaust gas that has passed through the particulate filter; a urea-water injector that is fixed to the upstream casing located in a position opposite to the exhaust gas outlet and injects urea-water toward the exhaust gas outlet; and a downstream casing that accommodates an ammonia selective reduction-type NOx catalyst into which the exhaust gas discharged from the exhaust gas outlet flows.

Exhaust purification apparatus for engine

An exhaust purification apparatus comprises an ammonia selective reduction-type NOx catalyst that selectively reduces NOx within exhaust gas by using ammonia as a reducing agent, a urea-water supply device that supplies urea-water into the exhaust gas existing upstream of the ammonia selective reduction-type NOx catalyst, and a control unit. The control unit controls the urea-water supply device so that the urea-water is intermittently supplied according to predetermined supply duration time and predetermined supply suspension time when the urea-water is supplied from the urea-water supply device for the purpose of providing ammonia to the ammonia selective reduction-type NOx catalyst.

An agitating device for agitating the exhaust gas of an engine includes a base plate having a plurality of through holes that are defined by radially extending spoke portions and a ring-like rim portion and are arranged in a circular pattern in a circumferential direction of the base plate, and a plurality of fins expanding from the respective spokes on a slant with respect to the base plate. The base plate is fixed in the exhaust passage by the rim portion being jointed to the exhaust passage at welded portions. The welded portions are each disposed in an area between respective two adjacent spoke portions in the circumferential direction of the base plate, and an outer edge of the rim portion positioned on the outer side of the rim portion in extending directions of the spoke portions is located next to the exhaust passage with a gap provided therebetween.

An exhaust purification device for an engine comprises a catalytic device for purifying exhaust by using an additive, a deflecting device for allowing the exhaust to flow through and causing the exhaust to be agitated, upstream of the catalytic device, an additive injection device for injecting an additive, downstream of the deflecting device, a temperature detection device for detecting exhaust temperature, downstream of the deflecting device, and a control unit for controlling the additive injection device on the basis of the exhaust temperature detected by the temperature detection device. The temperature detection device has a temperature detection part located within a region where the exhaust having passed through the deflecting device has increased velocity.

An exhaust gas purification device comprises a NOx catalyst for purifying NOx contained in exhaust gas by using ammonia as a reducing agent, an ammonia supply device for supplying ammonia to the NOx catalyst, a catalyst temperature sensor for detecting the internal temperature of the NOx catalyst, and a control unit that stops the ammonia supply from the ammonia supply device when the stop condition is satisfied that the internal temperature of the NOx catalyst becomes equal to or higher than first prescribed temperature in the process where ammonia is supplied from the ammonia supply device to the NOx catalyst.

Exhaust gas purification device

An exhaust gas purifying system reliably detects an amount of accumulated particulates, lengthens forced regeneration intervals, and improves fuel efficiency. The exhaust gas purifying system comprises: a particulate filterdisposed in an exhaust system of an internal combustion engineand collecting particulates from exhaust gas, and an NOgenerating unitupstream of or in the particulate filter; a discharged particulate amount calculating unit Acalculates an amount Me of discharged particulates on the basis of an excess air ratio &#x3bb;; a burnt particulate amount calculating unit Acalculates an amount Mb of burnt particulates on the basis of the temperature of exhaust gas in front of the particulate filter or the temperature of the particulate filter; and a particulate accumulation amount calculating unit calculates an amount Ma of accumulated particulates on the basis of the amount Me of discharged particulates or the amount Mb of burnt particulates.

Exhaust emission control device of internal combustion engine

In regenerating a filter there are performed a first additional fuel injection involving additional injection of fuel into a cylinder after a main fuel injection in an engine to raise the temperature of an oxidation catalyst and a second additional fuel injection involving fuel injection after the first additional fuel injection to supply the oxidation catalyst with the fuel, a second additional fuel injection quantity is set in accordance with an engine speed and an engine load and is changed in accordance with an outlet temperature of the oxidation catalyst.

Exhaust gas purifying system and exhaust gas purifying method

A NOx catalyst for selectively reducing NOx in exhaust gas by adsorbing ammonia is provided at an exhaust system of an engine, ammonia or urea water is supplied to the NOx catalyst by reducing agent supplying means, a consumption amount of ammonia adsorbed to the NOx catalyst is derived by consumption amount deriving means based on an exhaust amount of NOx exhausted from the engine detected or estimated by NOx exhaust amount deriving means and an actual NOx cleaning rate by the NOx catalyst derived by actual NOx cleaning rate deriving means, an actual adsorption amount of ammonia adsorbed to the NOx catalyst is derived in accordance with an addition amount of ammonia and the consumption amount of ammonia by adsorption amount deriving means and the reducing agent supplying means is controlled by controlling means in accordance with the actual adsorption amount.

NOx cleaning apparatus and NOx cleaning method for internal combustion engine

An exhaust emission control system of an internal combustion engine capable of post injection is disclosed which provides control such that the injection timing in sub injection is set to a point earlier than the target injection timing when the sub injection is started, and the injection timing in the sub injection is then delayed to the target injection timing. This realizes the post injection under the optimum conditions and enables an efficient rise in the exhaust temperature while inhibiting deterioration of the drivability due to a rapid change in torque.

Exhaust emission control system of internal combustion engine

An exhaust emission control system of an internal combustion engine is provided which controls the oxygen concentration of exhaust passing through the exhaust emission control device according to the flow rate of exhaust flowing through an exhaust passage when the exhaust emission control device is regenerated, so that the regeneration is completed within a short period of time while the filter is prevented from being damaged by melting during the regeneration. This improves the exhaust emission control performance and reliability of the filter.

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Kawasaki, Japan

Satoshi Hiranuma