Abstract: A burner includes a tube, which includes a pre-mixing chamber that generates an air-fuel mixture containing fuel and a combustion chamber that burns the fuel. A first pipe supplies fuel, which is heated by an electric heater to the pre-mixing chamber. A second pipe includes a heat exchange unit that converts combustion heat of the fuel to vaporization heat of the fuel and supplies fuel heated by the heat exchange unit to the pre-mixing chamber. The second pipe is branched from the first pipe at a branched point, and the electric heater and the heat exchange unit are connected in parallel to the pre-mixing chamber.

Abstract: A burner includes a tube, which includes a pre-mixing chamber that generates an air-fuel mixture containing fuel and a combustion chamber that burns the fuel. A first pipe supplies fuel, which is heated by an electric heater to the pre-mixing chamber. A second pipe includes a heat exchange unit that converts combustion heat of the fuel to vaporization heat of the fuel and supplies fuel heated by the heat exchange unit to the pre-mixing chamber. The second pipe is branched from the first pipe at a branched point, and the electric heater and the heat exchange unit are connected in parallel to the pre-mixing chamber.

Abstract: An EGR cooler including tubes and a shell enclosing the tubes. Cooling water is supplied into and discharged from the shell. Exhaust gas is guided from a diesel engine into the tubes for thermal exchange of the exhaust gas with the cooling water. A bypass flow path for guiding the cooling water is constituted within the shell so as to prevent stagnation of the cooling water in the shell.

Abstract: A particulate filter is realized in a compact size which is adaptive to forced regeneration through addition of fuel and which can prevent white fume from being generated by excessive part of the fuel. A particulate filter 12 is disclosed which captures particulates entrained in exhaust gas 2. Plug bodies 8 at inlets of a filter body 7 are arranged in passages and inwardly of an inlet edge of the filter body by predetermined distance, added-fuel oxidation catalyst 13 with enhanced performance of promoting oxidation reaction of the added fuel being carried in a region between the inlet edge of the filter body and arranged positions of the plug bodies 8 at the inlets.

Abstract: Provided is an EGR cooler which can solve the problem of the vibrated tubes without causing thermal deformation due to stagnation of the coolant water, without complexity of piping in the coolant water system and without increase in pressure loss. The EGR cooler comprises tubes 3 and a shell surrounding the tubes 3, the coolant water being supplied and discharged to and from the shell 1 and being passed through the respective tubes 3 so as to make heat exchange of the exhaust gas with the coolant water. In the shell 1, an intermediate support plate 13 with a plurality of through-holes 14 is arranged and mutually adjacent ones of the tubes 3 are grouped for penetratingly fixture to the through-hole 14. A coolant water passage 15 is ensured between the tubes 3 grouped and penetratingly fixed to the same through-hole 14 of the intermediate support plate 13 for free communication between the tubes 3.

Abstract: Coolant water is prevented from stagnating with no restriction to a mounted posture of an EGR cooler to a vehicle. The EGR cooler has tubes 3 and a shell 1 surrounding the tubes 3, coolant water 9 being fed into and discharged from the shell 1, exhaust gas being passed through the tubes 3 for heat exchange of the exhaust gas with the coolant water 9. An annular coolant-water supply chamber 11 is fitted over the shell 1 near an axial end of the shell 1. A coolant-water inlet pipe 4 is connected to a periphery of the supply chamber 11. Communicating holes 12 are formed at a plurality of peripheral positions sequentially along a portion of the shell 1 surrounded by the supply chamber 11 such that the holes have gradually reduced diameters as they are apart from the connection of the shell with the inlet pipe 4, so that the coolant water 9 may be introduced into the shell 1 substantially evenly through the communicating holes 12.

Abstract: An EGR cooler including tubes and a shell enclosing the tubes. Cooling water is supplied into and discharged from the shell. Exhaust gas is guided from a diesel engine into the tubes for thermal exchange of the exhaust gas with the cooling water. A bypass flow path for guiding the cooling water is constituted within the shell so as to prevent stagnation of the cooling water in the shell.

Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through the porous partition walls to remove particulates from the exhaust gas, the predetermined flow paths among the flow paths being sealed at their ends, a catalyst being carried by the porous partition walls, the porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 &mgr;m when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of the porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.

Abstract: An EGR cooler including a flat box shell having an inlet for introducing cooling water and an outlet for discharging the cooling water, plates positioned at axial open ends of the shell to close the axial open ends thereof, hoods positioned at sides of the plates away from the shell to enclose end faces of the plates, tubes extending within the shell and having ends penetrating through the plates, the tubes for passing exhaust gas from one hood to the other for thermal exchange with the cooling water, guide plates curved away from the axial extension of the shell toward longer sides of the end face of the shell and provided in the hood on an inlet side of the exhaust gas, a bar positioned between the guide plates and extending in a direction of shorter sides of the end face of the shell for dividing a stream of the exhaust gas.

Abstract: An EGR cooler including a flat box shell having an inlet for introducing cooling water and an outlet for discharging the cooling water, plates positioned at axial open ends of the shell to close the axial open ends thereof, hoods positioned at sides of the plates away from the shell to enclose end faces of the plates, tubes extending within the shell and having ends penetrating through the plates, the tubes for passing exhaust gas from one hood to the other for thermal exchange with the cooling water, guide plates curved away from the axial extension of the shell toward longer sides of the end face of the shell and provided in the hood on an inlet side of the exhaust gas, a bar positioned between the guide plates and extending in a direction of shorter sides of the end face of the shell for dividing a stream of the exhaust gas.

Abstract: An EGR cooler including a cylindrical shell having a cooling water inlet for introducing cooling water into the shell at one axial end, a cooling water outlet for discharging the cooling water from the shell at the other axial end, and a bypass outlet for pulling out part of the cooling water at a position diametrically opposed to the cooling water inlet, plates positioned at axial ends of the shell so as to close the axial ends of the shell, hoods positioned at sides of the plates away from the shell so as to enclose end faces of the plates, and tubes extending axially within the shell and having ends penetrating through the plates. The tubes passes exhaust gas from one of the hoods to the other hood for thermal exchange of the exhaust gas with the cooling water.

Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through the porous partition walls to remove particulates from the exhaust gas, the predetermined flow paths among the flow paths being sealed at their ends, a catalyst being carried by the porous partition walls, the porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 &mgr;m when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of the porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.