Abstract: While the loading member supporting mechanism moves the loading member from the workpiece set state to the workpiece retracted state and returns to the workpiece set state again, the displacement drive unit and the rotation drive unit perform an operation of disposing the workpiece holding portion arranged at the processing position to the replacement position and an operation of disposing the workpiece holding portion disposed at the replacement position to the processing position in a trajectory in which the loading member does not interfere with the shoe.

Abstract: While the loading member supporting mechanism moves the loading member from the workpiece set state to the workpiece retracted state and returns to the workpiece set state again, the displacement drive unit and the rotation drive unit perform an operation of disposing the workpiece holding portion arranged at the processing position to the replacement position and an operation of disposing the workpiece holding portion disposed at the replacement position to the processing position in a trajectory in which the loading member does not interfere with the shoe.

Abstract: An exhaust emission control device for a diesel engine 1, in which fuel is injected prior to a compression upper dead center and is ignited and burned after accelerated premixing of the fuel, is provided with a plasma fuel reformer 17 which produces H2-containing reformed gas through plasma discharge using the fuel F as a starting material and supplies the reformed gas through an intake manifold 6 into cylinders 7.

Abstract: An exhaust emission control device is disclosed. The device includes an NOx-occlusion reduction catalyst incorporated in an exhaust passage for reduction and purification of NOx, a fuel reforming catalyst structure and plasma fuel reforming unit for decomposition of the fuel into H2 and CO is arranged in the exhaust passage upstream of the reduction catalyst, so that the fuel is decomposed into H2 and CO such that NOx on the surface of the NOx-occlusion reduction catalyst can be efficiently reduced into N2. Thus, high NOx reduction ratio can be always obtained irrespective of variety of operational conditions.

Abstract: In an exhaust emission control device with NOx-occlusion reduction catalyst 5 incorporated in an exhaust passage 2,4 for reduction and purification of NOx, a fuel reforming catalyst structure 7 or plasma fuel reforming means 8 for decomposition of the fuel into H2 and CO is arranged in the exhaust passage 2,4 upstream of the reduction catalyst 5, so that the fuel is decomposed into and CO. By such H2 and CO, NOx on the surface of the NOx-occlusion reduction catalyst can be efficiently reduced into N2. Thus, high NOx reduction ratio can be always obtained irrespective of variety of operational conditions.

Abstract: Fuel added to exhaust gas is uniformly afforded to catalytic surfaces of a NOx-adsorption reduction catalyst so that overall regeneration of the NOx-adsorption reduction catalyst proceeds efficiently. The invention is directed to an exhaust emission control device with the NOx-adsorption reduction catalyst incorporated in an exhaust pipe (exhaust flow passage) for guidance of the exhaust gas 9 from an engine 1 and with an fuel addition device (fuel addition means) 13 arranged for addition of fuel as a reducing agent to the exhaust pipe (exhaust flow passage) 11 upstream of the reduction catalyst 12 (exhaust flow passage) 11, a dispersion plate 15 being arranged between a position of adding the fuel by the fuel addition device 13 and the NOx-adsorption reduction catalyst 12 for dispersing the exhaust gas 9 to stimulate dispersion of the added fuel.

Abstract: There is provided an exhaust gas recirculation device for an engine, which is capable of reducing the emission of NOx and preventing engine overheat when an engine is operated at low to normal high loads. An intake passage (15) for supplying air to a cylinder of an engine (12) is connected to an intake port (14) of the engine, and an exhaust passage (17) for discharging exhaust gas in the cylinder into the atmosphere is connected to an exhaust port (16) of the cylinder. An external EGR device (21) has an EGR passage (21a) one end of which is connected to the exhaust passage and the other end of which is connected to the intake passage and an EGR valve (21b) capable of opening and closing the EGR passage, and an internal EGR device introduces exhaust gas into the cylinder through the exhaust passage by opening an exhaust valve for opening and closing the exhaust port at the time of intake stroke of the cylinder.

Abstract: Provided are a hollow inner electrode constituted by an electrically conductive filter capable of capturing particulates, a cylindrical outer electrode circumferentially surrounding the electrode, a housing incorporated in a flow passage of exhaust and accommodating the electrodes and, a temperature sensor for detecting temperature of the exhaust and an electric discharge controller for controlling electric power to be distributed to the electrodes and on the basis of a detected value of the temperature sensor. When the temperature of the exhaust obtained by the temperature sensor is lowered, electric power necessary for generation of discharge plasma is distributed by the discharge controller to the electrodes and, thereby oxidizing the particulates captured by the electrode to reduce electricity consumption.

Abstract: Provided is an exhaust emission control device which can properly burn off soot and soluble organic fraction attached to and accumulated on electrodes of a plasma generator. The exhaust emission control device with a post-processing device (catalyst regenerative particulate filter) for allowing exhaust gas to pass therethrough for gas purification incorporated in an exhaust pipe of an internal combustion engine (diesel engine) comprises a plasma generator arranged upstream of the post-processing device for discharging electricity in the exhaust gas to generate plasma, flow-through type oxidation catalyst arranged upstream of the plasma generator, fuel adding means (controller) arranged upstream of the oxidation catalyst for adding fuel into the exhaust gas, temperature increasing means (suction throttling valve or controller) for increasing the exhaust temperature to a level enough for oxidation reaction on the oxidation catalyst of the fuel added by said fuel adding means.

Abstract: Increase of NOx emission is minimized even under a condition that NOx depuration system has malfunction. An exhaust emission control device is disclosed which has selective reduction catalyst 10 incorporated in an exhaust pipe 9, urea water 17 (reducing agent) being added to exhaust gas upstream of the selective reduction catalyst 10 by urea water adding means 18 (reducing agent adding means) so as to depurate NOx through reduction. The exhaust emission control device has NOx sensors 24 and 25 respectively arranged on entry and exit sides of the selective reduction catalyst 10 for detecting NOx concentrations, and an NOx deputation control device 23 (control device) which judges abnormality, on the basis of detection signals 24a and 25a from the NOx sensors 24 and 25, by non-attainment of a predetermined Nox reduction ratio and, when such abnormality is judged, restriction of an amount of fuel to be injected is commanded.

Abstract: Provided is an exhaust emission control device which can properly burn off soot and soluble organic fraction attached to and accumulated on electrodes of a plasma generator. The exhaust emission control device with a post-processing device (catalyst regenerative particulate filter 10) for allowing exhaust gas to pass therethrough for gas purification incorporated in an exhaust pipe 9 of an internal combustion engine (diesel engine 1) comprises a plasma generator 11 arranged upstream of the post-processing device for discharging electricity in the exhaust gas 8 to generate plasma, flow-through type oxidation catalyst 12 arranged upstream of the plasma generator 11, fuel adding means (controller 17) arranged upstream of the oxidation catalyst 12 for adding fuel into the exhaust gas 8, temperature increasing means (suction throttling valve 22 or controller 17) for increasing the exhaust temperature to a level enough for oxidation reaction on the oxidation catalyst 12 of the fuel added by said fuel adding means.

Abstract: Provided are a hollow inner electrode 5 constituted by an electrically conductive filter capable of capturing particulates, a cylindrical outer electrode 6 circumferentially surrounding the electrode 5, a housing 4 incorporated in a flow passage of exhaust G and accommodating the electrodes 5 and 6, a temperature sensor 2 for detecting temperature of the exhaust G and an electric discharge controller 3 for controlling electric power to be distributed to the electrodes 5 and 6 on the basis of a detected value of the temperature sensor 2. When the temperature of the exhaust G obtained by the temperature sensor 2 is lowered, electric power necessary for generation of discharge plasma is distributed by the discharge controller 3 to the electrodes 5 and 6, thereby oxidizing the particulates captured by the electrode 5 to reduce electricity consumption.

Abstract: There is provided a filtering means regenerating system for a diesel engine, in which the filtering means provided in an exhaust gas passage oxidizes NO in exhaust gas of the engine into NO2, and collects particulates in exhaust gas to thereby oxidize the particulates by NO2 and remove the same at a temperature higher than a predetermined exhaust gas temperature. Also, an in-line fuel injection system for injecting fuel into the engine is provided with a variable timer mechanism for regulating the injection timing of fuel, and the deposit of particulates deposited on the filtering means is detected by deposit detecting means. A controller controls the variable timer mechanism based on the detection output of the deposit detecting means. The filtering means is prevented from becoming in an excessively collecting state in all operation statuses of the engine, thereby preventing a decrease in fuel economy and power performance of the engine.

Abstract: A diesel engine includes a turbocharger, an intercooler, a particulate filtering unit, and an EGR cooler. EGR ratio of intake air, injection timing of an injection nozzle, and excess air ratio to fuel are controlled depending upon engine-operating load. Lean premixed compression ignition is performed at low engine load; low temperature combustion at low excess air ratio with high EGR ratio is performed at medium engine load; and normal EGR combustion is performed at high engine load.

Abstract: An apparatus is disclosed for purifying the exhaust gas of a diesel engine by reducing the contents of soluble organic fractions which are particulates. The apparatus comprises a catalyzer provided on an exhaust pipe, a cooler provided around either a portion of the pipe between the catalyzer and the engine or the catalyzer in itself for cooling the gas flowing through the pipe, a temperature sensor for detecting the temperature of the gas flowing through the pipe, a tachometer for detecting the rotating speed of the engine, a load sensor for detecting the load on the engine, a controller for controlling the cooler on the basis of the respective detection outputs from the sensors.

Abstract: A diesel engine comprising a fuel injection device and a controller for controlling the fuel injection device in accordance with an operating condition of the engine. The fuel injection device effects a preliminary injection for injecting fuel into a cylinder during a period from the initial part of an intake stroke to the middle part of a compression stroke and a main injection for injecting fuel into a combustion chamber in the vicinity of a top dead center of the compression stroke, whereby lean mixture is formed and a maximum combustion temperature in the combustion chamber is decreased to suppress generation of NOx and to reduce emission of black smoke.

Abstract: The backwash type particulate filter according to the present invention is constituted by a gas permeable ceramic filter with a plurality of bores, the one ends of which open to gas inlet ports and the other ends of which open to gas outlet ports and the inner surfaces of the bores being used for filtration surfaces, and a NOx catalyst carried on the outer surface of the ceramic filter. Accordingly, the NOx catalyst is isolated from the influence of heat caused by burning the soot in the exhaust gas from a diesel engine collected on the filtration surfaces, thereby maintaining its catalytic function for a long time. The soot in the exhaust gas is effectively removed with the ceramic filter and the hazardous gas components in the exhaust gas with the NOx catalyst, respectively.