Abstract: A degree of dispersion of a reducing agent added to an exhaust gas flowing into an exhaust gas purification apparatus is controlled. Before addition fuel is added, a valve opening Vd of a flow area changing valve is changed to generate pulsation of the exhaust gas, so that addition valve vicinity exhaust gas pressure Pg varies periodically. Addition timing TMad is controlled to synchronize with extremum arrival timing TMe. High or low dispersion type addition control adds fuel at timing (CP) when the addition valve vicinity exhaust gas pressure Pg becomes a maximum value Pgmax, at timing (TP) when at a minimum value Pgmin, or at both timings (CP, TP).

Abstract: An exhaust purifying apparatus for an internal combustion engine according to the present invention comprises an exhaust purifying catalyst provided in an exhaust passage, a burner device provided upstream of the exhaust purifying catalyst and generating a heated gas for heating the exhaust purifying catalyst, the burner device including at least a glow plug and a fuel injection nozzle injecting fuel toward the glow plug, and a heat spot member as a heat accumulator provided downstream of the burner device and upstream of the exhaust purifying catalyst.

Abstract: An internal combustion engine wherein an HC treatment catalyst (12) having the function of adsorbing the HC in the exhaust gas is arranged upstream of the NOx selective reducing catalyst (14), an urea aqueous solution fed from the reducing agent feed valve (15) is arranged upstream of the HC treatment catalyst (12), urea, and NOx contained in the exhaust gas, and HC adsorbed on the HC treatment catalyst 12 are reacted with each other to form intermediate products having cyano groups, oximes, and amino groups, and these intermediate products are sent to the NOx selective reducing catalyst (14).

Abstract: In an internal combustion engine, a pair of NOx storing catalysts are arranged in series in an engine exhaust passage. When causing the upstream NOx storing catalyst to release NOx and store the released NOx in the downstream NOx storing catalyst, the oxygen concentration in the exhaust gas is temporarily reduced in a state where the exhaust gas is maintained at a lean air-fuel ratio. As opposed to this, when releasing NOx from the upstream NOx storing catalyst and the downstream NOx storing catalyst and reducing the NOx, the air-fuel ratio of the exhaust gas is temporarily switched from lean to rich.

Abstract: Degradation of ignition means due to combustion of foreign objects attached to the ignition means is suppressed. There are provided a fuel supplying apparatus for supplying fuel into an exhaust passage in an internal combustion engine, a heating apparatus for burning the supplied fuel, and a controller. The controller, in a case where unburned components of an exhaust gas are deposited in the heating apparatus, burns the deposited unburned components by the heating apparatus for removal before increasing a temperature of the exhaust gas by igniting the fuel supplied from the fuel supplying apparatus by the heating apparatus.

Abstract: An object of the present invention is to produce O3 to be supplied to the exhaust gas of an internal combustion engine while suppressing deterioration of the fuel economy. An O3 production apparatus according to the present invention is an O3 production apparatus that produces O3 to be supplied to the exhaust gas of an internal combustion engine by generating a plasma, when the operation state of the internal combustion engine is a decelerating operation state in which the engine load becomes lower.

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: An exhaust purification system of an internal combustion engine is provided with an exhaust treatment device which purifies exhaust, a fuel feed device which is arranged at an upstream side from the exhaust treatment device and which feeds fuel to the engine exhaust passage, an ignition device which causes fuel which is fed from the fuel feed device to ignite, and a flow regulating device which regulates the flow rate of exhaust gas which flows toward the ignition device. The fuel feed device is formed so as to feed liquid fuel. The system has an operating region in which due to the fuel which is fed to the engine exhaust passage burning, backflow of the exhaust gas occurs. Further control is performed to make the flow rate of the exhaust gas increase during the period from when combustion of fuel should be started to when combustion of the fuel ends.

Abstract: Provided is a technology enabling a temperature of an exhaust gas purifying device to rise more surely by operating an electric heater for a catalyst attached with the electric heater more steadily without exerting an excessive load on a battery. Included are the battery and the electric heater operating upon being supplied with electric power from the battery and heating an occlusion-reduction type NOx catalyst, wherein it is predicted, from a point that a SOx occluded quantity into the occlusion-reduction type NOx catalyst is equal to or larger than S1, that a SOx poisoning recovery process will be executed in near future (S102), and a charging level of the battery is increased (S106) by raising a voltage of power generation of an alternator (S103).

Abstract: In an internal combustion engine, an NOX selective reducing catalyst is arranged in the engine exhaust passage, and an NOX storage catalyst able to store NOX contained in the exhaust gas is arranged at the upstream of the NOX selective reducing catalyst. The NOX storage catalyst is fed with mist fuel, and the NOX stored in the NOX storage catalyst and the fed fuel are used to produce an intermediate product comprising bonded molecules comprised of NH2 and a hydrocarbon molecule more than an equivalent ratio with respect to one NOX molecule. These intermediate products are adsorbed at the NOX selective reducing catalyst, whereby the adsorbed intermediate product reduces the NOX in the exhaust gas.

Abstract: A technique is provided which is capable of reducing an amount of smoke generated in a temperature raising system in which fuel added to an exhaust gas flowing through an exhaust passage is caused to combust at the time of requesting a temperature rise in an exhaust gas purification catalyst. When a request for raising the temperature of an exhaust gas purification catalyst (4) is made, bypass control is carried out in which the exhaust gas having bypassed a turbine (6b) is caused to flow into the exhaust gas purification catalyst (4) through a bypass passage (7), and fuel ignition control is carried out in which a fuel addition valve (9) is caused to add fuel to the exhaust gas which has flowed out of the turbine (6b), and a glow plug (10) is caused to ignite the added fuel.

Abstract: An exhaust gas purifying system for an internal combustion engine includes a first exhaust passage (22a) and a second exhaust passage (22b) into which an exhaust passage (21) of the internal combustion engine is bifurcated. NOx storage reduction catalysts (23a, 23b) and particulate filters (24a, 24b) are provided in each of the exhaust passages (22a, 22b). Fuel is supplied from a fuel valve (32) when NOx is to be released from the NOx storage reduction catalysts (23a, 23b). At a timing when the supplied fuel attaches to the NOx storage reduction catalysts (23a, 23b), one of exhaust control valves, for example, a first exhaust control valve (26a) is temporarily closed so as to keep the air-fuel ratio of exhaust gas rich. When NOx is released from the NOx storage reduction catalysts (23a, 23b) next time, a second exhaust control valve (26b) is temporarily closed after the fuel is supplied.

Abstract: An object of the invention is to provide a technique for improving the efficiency of performance regeneration process that is executed on NOx storage reduction catalysts provided in a plurality of branch passages branching from the exhaust passage and reduce emissions of NOx from an internal combustion engine to the atmosphere. When the quantity of NOx discharged from an internal combustion engine and flowing into an exhaust pipe is smaller than a predetermined quantity, fuel serving as reducing agent is added through a fuel addition valve while torque change moderating process is executed (from T0 to T1). After that, a first flow rate control valve is closed to make the flow rate of the exhaust gas flowing in the first branch passage smaller than that in the second branch passage (from T1 to T3).

Abstract: An internal combustion engine in which a main SOx trap catalyst able to trap SOx contained in exhaust gas is arranged in an engine exhaust passage, and the exhaust passage downstream of the main SOx trap catalyst is divided into a main exhaust passage and a bypass passage bypassing the main exhaust passage. An NOx storage catalyst is arranged in the main exhaust passage, and an auxiliary SOx trap catalyst is arranged in the main exhaust passage upstream of the NOx storage catalyst. Normally, the exhaust gas is made to flow in the main exhaust passage. When regenerating the main SOx trap catalyst, the exhaust gas is made to flow through the bypass passage.

Abstract: An exhaust gas control device of an internal combustion engine has an exhaust treatment device that purifies an exhaust gas. The exhaust gas control device is formed such that unburned fuel is supplied into the exhaust gas by a fuel addition valve, and the unburned fuel is ignited by a glow plug, to generate thereby a flame that reaches an upstream end of an exhaust treatment device. The unburned fuel is caused to become adhered to the upstream end of the exhaust treatment device before a generated flame reaches the exhaust treatment device. Then, the unburned fuel adhered to the upstream end of the exhaust treatment device burns by the flame.

Abstract: The problem is to regenerate the purification ability of an exhaust gas purification device more reliably or efficiently in an exhaust gas purification system that combines a plurality of branch passages branch off from an exhaust gas passage and exhaust gas purification devices. When the purification ability of an exhaust gas purification device is regenerated, in the branch passage where the exhaust gas purification device is provided whose purification ability is to be regenerated, the opening angle of an exhaust gas flow volume control valve is set to the minimum opening angle that can reliably transport a reducing agent that is added from a reducing agent addition section. While the opening angle is maintained, the reducing agent is added. After the addition of the reducing agent is complete, the opening angle of an exhaust gas flow volume control valve is closed completely.

Abstract: An exhaust purification system provided with an exhaust manifold, a catalytic converter which is arranged at a downstream side of the exhaust manifold an angle with respect to the exhaust manifold and which houses an NOx storage and reduction catalyst, and a reducing agent feed system which feeds reducing agent into exhaust gas which passes through the inside of the exhaust manifold. The part of the inner wall surface of the casing of the catalytic converter which faces the exhaust manifold outlet is provided with a projecting part which projects out toward the diametrically outward direction of the casing. Part of the wall surface which defines the projecting part is formed so that a velocity component, in an axial direction of the casing, of at least part of the flow of exhaust gas which flows into the projecting part, is oriented in an opposite direction to the direction heading toward the NOx storage and reduction catalyst.

Abstract: There is provided an exhaust gas purification system for an internal combustion engine in which exhaust gas that is in a state in which an even concentration distribution of reducing agent is achieved is caused to flow into an exhaust gas purification apparatus.

Abstract: An object is to provide a technology with which the temperature of exhaust gas can be raised with improved efficiency in cases where a catalyst apparatus including a catalyst having an oxidizing ability is provided in an exhaust passage of an internal combustion engine. According to the present invention, a catalyst apparatus 6 that is provided in the exhaust passage 1 of the internal combustion engine and to which reducing agent is supplied from upstream when the temperature of the exhaust gas is to be raised is equipped with at least first and second catalysts 4, 5 having an oxidizing ability. The first catalyst 4 is configured in such a way that the exhaust gas flows through a gap between its outer circumferential surface and the inner circumferential surface of the exhaust passage. The second catalyst 5 is disposed downstream of the first catalyst 4 with a space 10 having a specific width Ws between it and the first catalyst 4.

Abstract: An exhaust gas control apparatus includes an oxidation catalyst, a compact oxidation catalyst having a smaller cross section than that of an engine exhaust passage, a fuel supply valve, a glow plug, and an electronic control unit. The control modes for the exhaust gas control apparatus include a first control mode where the fuel is supplied from the fuel supply valve, heated by the glow plug, and ignited, a second control mode where the fuel is supplied from the fuel supply valve, and heated by the glow plug but is not ignited, and a third control mode where the fuel is supplied from the fuel supply valve and the glow plug does not provide heating. The electronic control unit selects the first or third control mode in the operation region where ignition is possible, and selects the second or third control mode in the operation region where ignition is not possible.