Mitsubishi Fuso Truck & Bus Corporation

Tokyo Roki Co., Ltd.

Hiroaki Fujita

Satoshi Hiranuma

Shinichi Saito

Yoshinaka Takeda

Yasuko Suzuki

Minehiro Murata

Satoshi Yamazaki

Yoshio Nakayama

Yusuke Horii

Goro Iljima

Yuji Mitsui

Norihiro Kajimoto

Fumio Aoki

Hayato Aizawa

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.

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Kawasaki, Japan

Hiroaki Fujita