Toyota Jidosha Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Nippon Soken, Inc.

Sumitomo Electric Industries, Limited

Nippondenso Co., Ltd.

Kabushiki Kaisha Toyota Chuo Kenkyusho

Kiyoshi Kobashi

Hidetaka Nohira

Tokio Kohama

Takeshi Matsui

Kiyohiko Oishi

Akira Nishimatsu

Hisasi Kawai

Shinichi Takeshima

Jiro Nakano

Toshikazu Ina

Yasushi Araki

Hiromichi Yanagihara

Yukihisa Takeuchi

Youichi Nagai

Tokuta Inoue

Masahiro Tomita

Kotaro Hayashi

Shigeru Takagi

Sumio Ito

Shigeru Kamiya

Syunsuke Ban

Shinya Hirota

Masaaki Tanaka

Yoshimasa Watanabe

Tomohiko Ihara

Hirofumi Suzuki

Kazuo Oyobe

Hiroki Hoshizaki

Kenichiro Takama

Terutaka Kageyama

Yoshihiko Imamura

Yoshimitu Henda

Toshiaki Tanaka

Kiyoshi Nakanishi

Shinichi Matsumoto

Satoshi Iguchi

Hitoshi Niwa

Yoshihiro Suzuki

Shunsuke Ban

Fumitada Murakami

Nobuaki Kawahara

Tomohiro Oda

Takeshi Kogiso

Takashi Yoshida

Kenichirou Takama

Yoichi Nagai

A particulate trap for use with a diesel engine is high in particulate trapping capacity and regenerating capacity and low in pressure drop, and yet is compact and inexpensive. This trap has a filter element made up of a plurality of tapered filter members formed from a fabric of heat-resistant metal fibers. The filter members have different diameters from each other and are nested concentrically one inside the other so that the adjacent filter members are positioned inversely. Each filter member is connected at its large-diameter end to the small-diameter end of the immediately outer filter member to alternately close the exhaust inlet and outlet ends of the gaps between the adjacent filter members. The filter element thus formed is mounted in a metal case provided in an exhaust line and used as a particulate trap. With this arrangement, it is possible to increase the particulate trapping area of the filter and the exhaust inlet openings without increasing the size of the entire trap. Such a trap is less likely to suffer pressure drop and is highly durable.

Particulate trap

An exhaust gas purification device of a compression-ignition combustion engine comprises exhaust branch passages each being connected to a corresponding cylinder of the engine at one end thereof and connected to a common exhaust passage at the other end thereof, and a filter arranged in at least one of the exhaust branch passages to trap particulates in the exhaust gas discharged from the engine. Pressure in the exhaust branch passage upstream of the filter is controlled to continuously make the pressure equal to or greater than a pressure in the exhaust branch passage downstream of the filter.

Exhaust gas purification device for a compression-ignition combustion

A particulate trap for use in a diesel engine which is inexpensive, and which is high in particulate trapping efficiency, regeneration properties and durability, and low in pressure loss due to particulates trapped. An even number of flat filters made from a non-woven fabric of heat-resistant metallic fiber are laminated alternately with the same number of corrugated sheets made of a heat-resistant metal. The laminate thus formed are rolled into a columnar shape. Each space between the adjacent flat filters in which every other corrugated sheet is inserted is closed at one end of the filter element by a closure member. The other spaces between the adjacent flat filters are closed at the other end of the filter element.

Particulate trap for diesel engine

A particulate trap for a diesel engine use which is less likely to vibrate or deform under exhaust pressures and achieves good results in all of the particulate trapping properties, pressure drop, durability and regenerating properties. This trap has a filter element made of plurality of flat or cylindrical filters. Longitudinally extending exhaust incoming and outgoing spaces are defined alternately between the adjacent filters by alternately closing the inlet and outlet ends of the spaces between the adjacent filters. Gas permeable reinforcing members are inserted in the exhaust outgoing spaces to prevent the filter from being deformed due to the difference between the pressure upstream and downstream of each filter produced when exhausts pass through the filters. Similar gas permeable reinforcing members may also be inserted in the exhaust incoming spaces or at both ends of the filter element to more positively prevent vibration of the filters.

A particulate trap for a diesel engine in which at least two nonwoven sheets made of heat-durable metallic fibers and at least two corrugated plates made of heat-durable metal having a width smaller than that of the nonwoven sheets are alternately overlaid in the thicknesswise direction with each other in a spiral manner, and one surface of one of the nonwoven sheets and one surface of the other of the nonwoven sheets are in close contact and are continuously welded to each other along the upstream edges thereof as seen from the flowing direction of the exhaust gas so that a first space closed along the upstream edges and opened along the downstream edges is formed between the nonwoven sheets via one of the corrugated plates, and the other surface of the one nonwoven sheet and the other surface of the other nonwoven sheet are in close contact and are continuously welded to each other along the down stream edges thereof as seen from the flowing direction of the exhaust gas so that a second space closed along the downstream edges and opened along the upstream edges is formed between the nonwoven sheets via the other of the corrugated plates, is disclosed. In the particulate trap, the difference in width between the nonwoven sheet and the corrugated plate is larger in a central zone of the particulate trap than in the circumferential zone thereof.

Particulate trap for a diesel engine

A compression ignition type engine comprising an NO.sub.x arranged in its exhaust passage. This NO.sub.x absorbent absorbs NO.sub.x when the air-fuel ratio of the inflowing exhaust gas is lean and releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas is rich. When NO.sub.x should be released from the NO.sub.x absorbent, the mean value of the air-fuel ratio in the combustion chamber is changed from lean to rich. At least at this time, use is made of fuel containing oxygen as the injected fuel.

Compression ignition type engine

Exhaust purification device of internal combustion engine

A NO.sub.x absorbent which absorbs NO.sub.x in exhaust gas when the air-fuel ratio of the exhaust gas is lean and releases absorbed NO.sub.x when the oxygen concentration of the exhaust gas is lowered, is disposed in an exhaust passage of an engine. When the amount of the NO.sub.x absorbed by the NO.sub.x absorbent is increased, the regenerating process of the NO.sub.x absorbent is performed by supplying a reducing agent to the NO.sub.x absorbent so that the NO.sub.x absorbed by the NO.sub.x absorbent is released and reduced by the reducing agent. Usually, to reduce the amount of the reducing agent required for the regenerating process, the inflowing exhaust gas into the NO.sub.x absorbent is shut off. In the present invention, even in the regenerating process of NO.sub.x absorbent, a small amount of the exhaust gas (carrier gas) is introduced to the NO.sub.x absorbent to carry the supplied reducing agent through the NO.sub.x absorbent to thereby reduce the amount of the reducing agent required for the regenerating process and to shorten the time required to complete the regenerating process.

Exhaust gas purification device for an engine

An exhaust emission gas control device having a first filter trapping particulates contained in an exhaust gas, and a second filter removing offensive odor components in the exhaust gas. The first filter is a honeycomb type having a cordierite substrate on which .tau.-alumina is coated. The second filter is provided downstream of the first filter, and is formed by an ion-exchange of copper on a synthetic zeolite rich in silica to form copper ions thereon.

Exhaust emission control device for a diesel engine

An exhaust gas purifying apparatus comprising a first and a second casings having expansion chambers, respectively, a third casing arranged between the first and second casings to form a passage therebetween, an inlet pipe introducing the exhaust gas into the first expansion chamber, and an outlet pipe discharging the exhaust gas from the second expansion chamber, whereby a muffler is constituted. The apparatus also comprises a filter arranged in the third casing to trap particulates in the exhaust gas, and a heater arranged adjacent to the filter on the side of the second expansion chamber to burn the particulates deposited on the filter, to regenerate the filter. A flow control unit, comprising a bypass and a valve therein, is arranged such that the exhaust gas normally flows through the filter and the heater, and when the filter is regenerated, at least a part of the exhaust gas flows in reverse through the heater and the filter. This exhaust gas purifying apparatus is built-in to the muffler.

Exhaust gas purifying apparatus built-in to a muffler for a diesel engine

An exhaust gas emission control device comprising a filter provided in the exhaust passage, a heater provided near the filter, first and second passage bypassing the filter and the heater, a single first valve upstream of the filter a single second valve downstream of the filter, and a controller controlling the first and the second valve. When trapping particles, one of or both of the first and second valves closes the first and second passages, and the first and second valves open the exhaust passage, whereby exhaust gas flows through the filter and the heater. On the other hand, when regenerating the filter, the heater is switched ON, the first valve shuts the exhaust passage and the second valve is open to a predetermined degree, so that exhaust gas flows into the first passage, and a part of the exhaust gas flowing via the first passage flows through the heater, the filter, and the second passage.

Exhaust gas emission control device for diesel engine

An exhaust-gas purifying apparatus according to the present invention comprises an exhaust-gas filter for trapping particulates in exhaust gas from an engine, and a heating device located on the upper-course side of the filter, with respect to the flowing direction of the exhaust gas, the heating device including one or more conductive-ceramic heater elements, capable of heating and burning the particulates caught by the filter, and a heater case for holding the heater elements in position, so that the caught particulates are heated and burned by the heater elements when the flow resistance of the exhaust gas, flowing through the filter, is increased by the caught particulates, whereby the flow resistance is reduced. The heater element includes a fixed electrode portion, immovably fixed to the heater case, and a slidable electrode portion held slidably. An electrode member, fixed to the heater case, is brazed to the fixed electrode portion, and the heater element is bonded to the electrode member, so as to be clamped from both sides by solidified molten solder. The slidable electrode portion is supported by the heater case, for sliding motion in the direction of thermal deformation, so that the working life of the heater element is prolonged.

Purifying apparatus of a particulate trap-type for collecting

A ceramic heater for regenerating a fine particle collecting filter which is exposed to exhaust gases at elevated temperatures. This ceramic heater comprises two electrode potions, a heat generation portion connected to the two electrode portions and a holding projection portion of a ceramic heater connected to the side of the heat generating portion. The two electrode portions, the heat generating portion and the holding projection portion are formed integrally.

Ceramic heater

An exhaust particle cleaning device for a diesel engine includes a trap case provided in a passage way of exhaust gas. A filter material is disposed in the trap case so that carbon particles or other exhaust particles contained in the exhaust gas can be caught within the filter material during the time the exhaust gas is passed through the filter material. A plurality of electric heater elements are spread or dispersed on the upstream end face of the filter material, so that the exhaust gas passes through the areas defined between the plurality of heater elements. The electric heater element may be coated with a ceramic material.

Exhaust gas cleaning device for diesel engines

An exhaust gas cleaning device comprises at least one exhaust gas flowing passage, at least one particulates collecting member composed of two filter elements having different heat capacity, which is disposed within the exhaust gas flowing passage and heating means which is interposed between the filter elements so as to be closely contacted therewith. The filter element having smaller heat capacity is disposed on the upper stream side of the heating means and the filter element having larger heat capacity is disposed on the downstream side thereof. The filter element having smaller heat capacity is rapidly heated by the heating means and the heat of the filter element having smaller heat capacity is transmitted to the filter element having larger heat capacity. All of the particulates collected by the particulates collecting member can be burnt off with excellent heat efficiency.

Exhaust gas cleaning device for internal combustion engine

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Mishima, Japan

Kiyoshi Kobashi