Abstract: An internal combustion engine in an engine exhaust passage of which an exhaust purification catalyst (13) having an oxidation function is arranged and in the engine exhaust passage upstream of the exhaust purification catalyst (13) of which a small-sized oxidation catalyst (14) and a fuel feed valve (15) for feeding fuel to the small-sized oxidation catalyst (14) are arranged. When activating the exhaust purification catalyst (13), the fuel fed from the fuel injector (15) is used to heat the small-sized oxidation catalyst (14) and when the exhaust purification catalyst (13) is further raised in temperature, the fuel fed from the fuel feed valve (15) is increased and reformed fuel is exhausted from the small-sized oxidation catalyst (14).

Abstract: An object of the present invention is to prevent an excessive temperature rise of a precatalyst in the case where the precatalyst is provided in the exhaust passage upstream of an exhaust gas purification apparatus and has a heat capacity smaller than that of the exhaust gas purification apparatus, and reducing agent is added from a reducing agent addition valve toward an upstream end surface of the precatalyst. According to the present invention, the reducing agent addition valve is located in such a way that the reducing agent added through it reaches the precatalyst in a liquid state.

Abstract: An apparatus that raises temperature of a post-catalyst at an early time while suppressing reducing agent poisoning of the post-catalyst and discharge of a reducing agent into the outside when a pre-catalyst and the post-catalyst are arranged in series in an exhaust passage of an internal combustion engine in order from an upstream side thereof. The pre-catalyst is arranged to allow an exhaust gas to flow between an outer peripheral surface thereof and an inner peripheral surface of the exhaust passage. A reducing agent addition valve adding a reducing agent to allow the reducing agent to pass through the pre-catalyst is arranged immediately upstream of the pre-catalyst in the exhaust passage. Further, a retention catalyst is arranged in the exhaust passage between the pre-catalyst and the post-catalyst, to temporarily retain the reducing agent in the exhaust gas.

Abstract: An object of the present invention is to improve preferable promotion of the modification of reducing agent in a precatalyst in the case where the reducing agent is added through a reducing agent addition valve in order to supply the reducing agent to an exhaust gas purification catalyst. According to the present invention, one end of an exhaust passage in which an exhaust gas purification catalyst is provided is connected to an exhaust manifold, and a precatalyst and a reducing agent addition valve are provided in the exhaust manifold. The precatalyst is configured in such a way that the exhaust gas flows through the gap between the outer circumferential surface thereof and the inner wall surface of the exhaust manifold. The precatalyst and the reducing agent addition valve are arranged in such a way that the most part of the reducing agent added through the reducing agent addition valve flows into the precatalyst.

Abstract: A small oxidation catalyst and a fuel supply valve are arranged in an engine exhaust passage. The small oxidation catalyst has a cross-sectional area smaller than a cross-sectional area of the engine exhaust passage, and portion of exhaust gas flowing in the engine exhaust passage flows through the small oxidation catalyst. The fuel supply valve supplies fuel to the small oxidation catalyst. Fuel is intermittently supplied from the fuel supply valve to the small oxidation catalyst to intermittently generate flames downstream of the small oxidation catalyst.

Abstract: A reducing agent addition valve is arranged in a position in which at least part of a reducing agent added to an exhaust gas in an exhaust passage at a location upstream of a precatalyst reaches the precatalyst in the state of liquid, and the reducing agent is supplied in a more suitable state to an exhaust gas purification device which is arranged in the exhaust passage at a downstream side of the precatalyst. When the addition of the reducing agent is performed by the reducing agent addition valve, the flow rate of the exhaust gas flowing into the precatalyst is decreased so that at least part of the reducing agent, which has reached the precatalyst and has vaporized in the precatalyst, is caused to flow back.

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: 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: 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: 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: 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: 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: 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 internal combustion engine in which a main SOx trap catalyst (11) 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 (11) is divided into a main exhaust passage (13) and a bypass passage (14) bypassing the main exhaust passage (13). An NOx storage catalyst (15) is arranged in the main exhaust passage (13), and an auxiliary SOx trap catalyst (16) is arranged in the main exhaust passage (13) upstream of the NOx storage catalyst (15). Normally, the exhaust gas is made to flow in the main exhaust passage (13). When regenerating the main SOx trap catalyst (11), the exhaust gas is made to flow through the bypass passage (14).

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 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: In a slide gate plate apparatus for casting to be installed at an outlet of a molten metal vessel, one or two fixed plates and one slide plate are retained integrally by retaining means through a shell wound round the side face of the fixed plate(s) and a shell wound round the side face of the slide plate. In this retained state, the fixed plate(s) and the slide plate are mounted together to a predetermined position of the molten metal vessel.

Abstract: An automatic probe feeding, setting and withdrawing apparatus includes a probe container case provided with a probe dispensing mechanism for dispensing individual probes to a probe transfer mechanism. The probe transfer mechanism has a motor-driven probe push member provided at one end of a carriage board formed with a V-shaped channel in its surface. The probes are transferred to a probe setting mechanism which has a movable block capable of making sliding movement through a given stroke by the operation a cylinder on a support board mounted for pivotal movement by the operation of a cylinder. The probes are moved from a horizontal to a vertical orientation by this probe-setting mechanism. The probes are so positioned that they can be grasped by a probe holding rod and can be appropriately inserted into a furnace for measurement of conditions therein. Thereafter, with the probes removed from the furnace, they are transferred to a probe withdrawing and recovering mechanism.