摘要:
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).
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.