Abstract: An exhaust purification apparatus of an internal combustion engine purifying exhaust gas by removing SOx from the exhaust gas is provided. In the exhaust purification apparatus provided with sulfur oxide trapping material for trapping sulfur oxides exhausted from an internal combustion engine, aggregates of the sulfur oxide trapping material (41) are arranged able to contact the exhaust gas in spaces (44) separated by partitions comprised of a porous material (42) having permeability.

Abstract: In an internal combustion engine, an NOX purification catalyst (14) is arranged in the engine exhaust passage and an intermediate product producing catalyst (12) able to store NOX contained in the exhaust gas is arranged at the upstream of the NOX purification catalyst (14). The intermediate product producing catalyst (12) is fed with mist fuel, and intermediate products (33) comprising bonded molecules comprised of an NOX and hydrocarbon molecules more than an equivalent ratio with respect to an NOX molecule are produced from the NOX trapped in the intermediate product producing catalyst (12) or the NOX contained in the exhaust gas and the fed fuel.

Abstract: In an exhaust gas purifying system including two NOx catalysts disposed in series with each other on an exhaust passage, oxides occluded in the NOx catalysts can be reduced appropriately. When the oxides occluded in an upstream or downstream NOx catalyst are reduced, the surrounding atmosphere of each NOx catalyst is changed between a reducing atmosphere and an oxidative atmosphere. The air-fuel ratio of exhaust gas upstream of the upstream NOx catalyst is made lower when the surrounding atmosphere of the downstream NOx catalyst is changed into a reducing atmosphere than when the surrounding atmosphere of the upstream NOx catalyst is changed into a reducing atmosphere, and the duration of the oxidative atmosphere is made longer when the surrounding atmosphere of the downstream NOx catalyst is changed into an oxidative atmosphere than when the surrounding atmosphere of the upstream NOx catalyst is changed into an oxidative atmosphere.

Abstract: An NOx adsorbent is arranged in an exhaust passage of an internal combustion engine, a fuel addition valve (28) is arranged in the exhaust passage upstream of the NOx adsorbent, and, when the NOx adsorbent should be made to release the NOx, the fuel addition valve (28) adds fuel to the NOx adsorbent in the required fuel addition amount to make the air-fuel ratio of the exhaust gas flowing into the NOx adsorbent temporarily rich. In this case, the required fuel addition amount is added divided into a plurality of operations. The fuel addition rate of the fuel addition valve (28) is detected and the overall addition time from the start of the initial divided addition to the end of the final divided addition is corrected in accordance with the fuel addition rate. Further, the divided addition time, interval, or number of divided additions is corrected so that the amount of fuel actually added from the fuel addition valve (28) is maintained at the required fuel addition amount.

Abstract: A post-treatment system comprised of an SOx trapping catalyst (11), a particulate filter (13) carrying an NOx storing and reducing catalyst, and an NOx storing and reducing catalyst (15) and a fuel feed valve (17) for feeding fuel for post processing to the post-treatment system are arranged in an engine exhaust passage. Each time an operating period of the engine passes a certain period, values of operating parameters of the engine and the method of feeding the post-treatment use fuel are reset so that the total amount of consumption of the combustion use fuel and post-treatment use fuel becomes smallest while maintaining the amounts of the harmful components discharged into the atmosphere at below the regulatory values.

Abstract: An internal combustion engine in which an SOx trapping catalyst (12) and particulate filter (13) are arranged in a engine exhaust passage and in which a recirculation exhaust gas takeout port (17) is formed in the engine exhaust passage downstream of the particulate filter (13). Inside the engine exhaust passage downstream of the recirculation exhaust gas takeout port (17), an NOx storing catalyst (15) and a reducing agent feed valve (21) are arranged. When NOx should be released from the NOx storing catalyst (15), reducing agent is fed into the exhaust passage from the reducing agent feed valve (21).

Abstract: In an internal combustion engine, the engine is formed so that an output of an electric motor can be superposed on an output of the engine. In the engine exhaust passage upstream of the NOX storage catalyst, an SOX trap catalyst able to trap the SOX contained in the exhaust gas is arranged. When regenerating the SOX trap catalyst, the vehicle drive power from the engine and the vehicle drive power from the electric motor are adjusted so that the SOX concentration in the exhaust gas flowing out from the SOX trap catalyst becomes less than a predetermined SOX concentration during the regeneration period.

Abstract: An SOX trap catalyst 12 and NOX purification catalyst 13 are arranged in an engine exhaust passage. A substrate 50 of the NOX purification catalyst 13 is formed with a coat layer comprised of at least the two layers of an upper coat layer 51 and a lower coat layer 52. The lower coat layer 52 is formed from an NOX storage catalyst storing the NOX contained in the exhaust gas when the air-fuel ratio of the exhaust gas is lean and releasing the stored NOX when the air-fuel ratio of the exhaust gas is a stoichiometric air-fuel ratio or rich. The upper coat layer 51 is formed from a material of a weaker basicity than this NOX storage catalyst.

Abstract: An engine exhaust passage has an SOx trapping catalyst (11), a particulate filter (13) holding an NOx storing/reducing catalyst, and an NOx storing/reducing catalyst (15) forming a post-treatment system and a fuel feed valve (17) for feeding fuel for post processing in the post-treatment system arranged inside it. When any catalyst has a degree of degradation exceeding a predetermined degree of degradation, the method of feeding the post-treatment fuel is reset so that the post-treatment fuel required for purification of the exhaust gas can be fed into the catalyst with the lowest degree of degradation to make the catalyst with the lowest degree of degradation handle the purification action of the exhaust gas.

Abstract: A main particulate filter having a relatively large volume is arranged in an exhaust passage of an engine, and an auxiliary particulate filter having a relatively small volume is arranged in the exhaust passage upstream of the main particulate filter. The main and auxiliary particulate filters are arranged so that the open downstream ends of the single open end-type exhaust gas passages of the auxiliary particulate filter and the open upstream ends of the open upstream end-type exhaust gas passages of the main particulate filter substantially face each other, and the open downstream ends of the both open end-type exhaust gas passages of the auxiliary particulate filter and the closed upstream ends of the open downstream end-type exhaust gas passages of the main particulate filter substantially face each other. A catalyst having an oxidation function is carried on the auxiliary particulate filter.

Abstract: A device for purifying the exhaust gas of an internal combustion engine is disclosed. The device includes a particulate filter arranged in the exhaust system, which carries a catalyst for absorbing and reducing NOx. The catalyst absorbs NOx when the air-fuel ratio in the surrounding atmosphere thereof is lean and releases the absorbed NOx to purify NOx by reduction when the air-fuel ratio is stoichiometric or rich. The device further includes a catalytic apparatus for purifying NOx arranged in the exhaust system upstream of the particulate filter, which has an oxidation function.

Abstract: In an internal combustion engine, a first exhaust passage and second exhaust passage branched from an exhaust passage are provided. An NOx storing reduction catalyst and a particulate filter are arranged in each exhaust passage. For example, when NOx should be released from the NOx storing reduction catalyst in the first exhaust passage, fuel is added from a fuel addition valve in the state with exhaust gas allowed to flow into only the first exhaust passage, while when the added fuel sticks to the NOx storing reduction catalyst, the first exhaust control valve is temporarily closed and the exhaust gas is made a rich air-fuel ratio.

Abstract: A catalyst (22) suitable for reduction of the NOx in an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NOx in the exhaust gas is reduced by the released ammonia.

Abstract: The invention provides a technology that enables to prevent sulfur components contained in reducing agent added from flowing into an NOx catalyst thereby keeping a high NOx removing rate. An S-trapping catalyst 11 for trapping sulfur components contained in exhaust gas discharged from an internal combustion engine 1, an S-trapping catalyst 12 for trapping sulfur components contained in reducing agent added to the exhaust gas from which sulfur components have been trapped by the S-trapping catalyst 11 are provided, thereby preventing an NOx catalyst 14 from being poisoned by sulfur.

Abstract: An SOx trap catalyst (11) able to trap SOx contained in exhaust gas is arranged in an engine exhaust passage upstream of an NOx storing catalyst (12). When the SOx trap rate by the SOx trap catalyst (11) falls, the air-fuel ratio of the exhaust gas flowing into the SOx trap catalyst (11) is maintained lean and in that state the SOx trap catalyst (11) is raised in temperature. The SOx trapped at that time diffuses inside the SOx trap catalyst (11), whereby the SOx trap rate is restored.

Abstract: This invention relates to an exhaust gas purifying apparatus having a particulate filter for collecting particulates in exhaust gas. This particulate filter (22) contains partition walls defining paths (50, 51) in which exhaust gas flows. This partition wall is formed of porous material. This particulate filter (22) is created by gathering tips of the partition walls and then baking with the adjacent partition walls being in contact with each other. The adjacent partition walls are bonded together at a predetermined bonding strength if the partition walls are baked such that they are in contact. According to this invention, the end portion of the particulate filter (22) has a higher strength than the predetermined bonding strength.

Abstract: An exhaust purification device, including a NOx storing catalyst comprised of a precious metal catalyst and NOx absorbent, arranged in an engine exhaust passage, which increases the ratio of the nitrogen dioxide to the nitrogen monoxide produced when burning fuel under a lean air-fuel ratio when the NOx storing catalyst is not active compared with the time when the NOx storing catalyst is active under the same engine operating conditions and stores the nitrogen dioxide contained in the exhaust gas in the NOx absorbent at that time.

Abstract: A particulate filter (22) for collecting particulates in the exhaust gas is comprised. The particulate filter (22) includes partitioning walls (54) for forming passages (50, 51). The partitioning walls (54) are made of a porous material. The end portions of adjacent partitioning walls (54) are brought close each other so as to narrow the respective passage formed by the partitioning walls (54), and the cross-sectional area of the flow path at the end region of the passage is made to be smaller than the cross-sectional area of the flow path in the remaining regions of the passage. The particulate filter (22) has an extended portion (55) which extends beyond the top ends of the partitioning walls (54) from the end surface of the particulate filter (22).

Abstract: A fuel fractionation method which can suitably control a state of a fuel at a time of fractionating the fuel in an internal combustion engine, which comprises the steps of applying an operation for promoting a fractionation of a fuel of an engine to a fractionation passage while making the fuel flow to the fractionation passage, thereby fractionating the fuel into a gas phase fuel and a liquid phase fuel within the fractionation passage, conducting the fractionated gas phase fuel and the fractionated liquid phase fuel to a branch point of the fractionation passage, and separating the gas phase fuel and the liquid phase fuel to a gas phase passage and a liquid phase passage, respectively due to gravity.

Abstract: A catalyst (22) suitable for reduction of the NOx in an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NOx in the exhaust gas is reduced by the released ammonia.