Abstract: This radiator fan for cooling a radiator has: a rotating member that rotates due to rotation of an engine; blade members that are provided on the peripheral surface of the rotating member such that the angle of surfaces that receive air is changed; a moving member, which is provided in the rotating member, and which moves toward the peripheral surface of the rotating member due to centrifugal force generated by means of the rotation of the rotating member; and a connecting member, which is connected to the moving member and the blade members, transmits the movement of the moving member to the blade members, and changes the angle of the surfaces.

Abstract: A urea water spraying device 20 is provided with: a urea water spraying nozzle 22 for spraying urea water into an exhaust passageway 3 of an engine 2; an assist gas spraying nozzle 23 for spraying an assist gas for promoting atomization of the urea water that has been sprayed by suctioning the urea water sprayed from the urea water spraying nozzle 22 and blowing the urea water into the exhaust passageway 3; and an assist gas supply passageway 27 for supplying the assist gas spraying nozzle 23 with exhaust passing through the exhaust passageway 3 as the assist gas.

Abstract: This EGR system is applied to a vehicle including an exhaust purification device capable of purifying NOx, and is provided with: an EGR passageway; a flow volume modification mechanism; and a control device which, when the NOx concentration in exhaust discharged from the exhaust purification device is greater than a reference value, starts to perform a control process for controlling the flow volume modification mechanism so that the ratio of the flow volume of a first exhaust that flows into a tail pipe decreases and the ratio of the flow volume of a second exhaust that flows into the EGR passageway increases, and makes the ratio of the flow volume of the second exhaust greater than the ratio of the flow volume of the first exhaust during the control process.

Abstract: A urine water spraying device 20 is provided with: a urine water spraying nozzle 22 for spraying urine water into an exhaust passageway 3 of an engine 2; an assist gas spraying nozzle 23 for spraying an assist gas for promoting atomization of the urine water that has been sprayed by suctioning the urine water sprayed from the urine water spraying nozzle 22 and blowing the urine water into the exhaust passageway 3; and an assist gas supply passageway 27 for supplying the assist gas spraying nozzle 23 with exhaust passing through the exhaust passageway 3 as the assist gas.

Abstract: This radiator fan for cooling a radiator has: a rotating member that rotates due to rotation of an engine; blade members that are provided on the peripheral surface of the rotating member such that the angle of surfaces that receive air is changed; a moving member, which is provided in the rotating member, and which moves toward the peripheral surface of the rotating member due to centrifugal force generated by means of the rotation of the rotating member; and a connecting member, which is connected to the moving member and the blade members, transmits the movement of the moving member to the blade members, and changes the angle of the surfaces.

Abstract: The intake increasing device 100 pertaining to the present invention is for increasing air intake of an engine, and is provided with, a cylindrical wall part 20 having an intake inlet 20in and an intake outlet 20out, the wall part 20 leading intake air from the intake air inlet 20in to the intake air outlet 20out, an ejection port 30 for ejecting air F2 flowing along an inner circumferential surface 21 of the wall portion 20 to an air intake downstream side, the ejection port 30 being provided in the wall part 20; and a fan 40 for sending air to the ejection port 30.

Abstract: Exhaust gas purification method where a purification agent, consumed by an exhaust gas purifier arranged in the exhaust passage of an internal combustion engine, is supplied by an injector in an exhaust pipe into the exhaust passage on the upstream side of the exhaust gas purifier and mixed with exhaust gas. The exhaust passage is provided with a step beyond which the exhaust passage expands in order to generate swirls in the exhaust gas flow, and the purification agent is introduced at the step or in the vicinity thereof, thus accelerating atomization of the purification agent. Consequently, vaporization and diffusion of the purification agent can be accelerated efficiently within a short distance in the exhaust passage, and the purification agent can reach the exhaust gas purifier under a state where the purification agent is made uniform. Consequently, an exhaust gas purification system can be used even in small vehicles.

Abstract: An exhaust gas purification system having a NOx conversion catalyst device with a catalyst supported thereon for conversion of NOx in the exhaust gas. In order to accurately introduce a fuel in a necessary and sufficient amount for raising the temperature for allowing the NOx conversion catalyst device to be brought to a desulfurization target temperature, even during transient operation to maintain the state of the device at a temperature of the desulfurization target or above, an amount of fuel necessary for raising a first detection temperature as an indicator of the catalyst temperature to a desulfurization target temperature is set using a heat quantity computed from a first heat quantity necessary for raising the temperature of the NOx conversion catalyst device and a second heat quantity necessary for raising the temperature of the exhaust gas.

Abstract: This invention provides an exhaust gas purification system (1) comprising a NOx conversion catalyst device (11) with a NOx conversion catalyst supported thereon for the conversion of NOx in the exhaust gas.

Abstract: In an exhaust gas purification method where purification agent F being consumed by an exhaust gas purifier (10) arranged in the exhaust passage (4) of an internal combustion engine (E) is supplied by an injector (13) in an exhaust pipe into the exhaust passage (4) on the upstream side of the exhaust gas purifier (10) and mixed with exhaust gas (G), the exhaust passage (4) is provided with a step (4b) beyond which the exhaust passage (4) expands as compared with the upstream side thereof in order to generate swirls in the exhaust gas (G) flow, and the purification agent (F) is ejected to the position of the step (4b) or in the vicinity thereof thus accelerating atomization of the purification agent (F). Consequently, vaporization and diffusion of the purification agent (F) can be accelerated efficiently within a short distance in the exhaust passage (4), and the purification agent can reach the exhaust gas purifier (110) under a state where the purification agent is made uniform.