A catalyst device includes a heating element that generates heat when energized, a case that accommodates a catalyst support (heating element), an inflow pipe that draws exhaust gas into the case, and a connecting pipe that connects the inflow pipe and the case to each other. The case includes an end portion, which protrudes further in an upstream direction than an end face of the catalyst support. The inflow pipe is disposed inside the case. The catalyst device includes a triple-walled pipe structure, in which the connecting pipe overlaps with the end portion of the case and the inflow pipe in a covering manner.

A NOx sensor protection system includes a flow control device forming an internal chamber with exhaust and shield gas ports and a NOx sensor. The flow control device is configured to selectively allow a flow of exhaust from an exhaust pipe to the NOx sensor when an internal combustion engine is operated with a first fuel, and to selectively direct shield gas from the shield gas port at an angle of 135° to 180° to the NOx sensor to inhibit the flow of exhaust from the exhaust pipe to the NOx sensor when the engine is operated with a second fuel.

A device for screening a NO.sub.x sensor provided on a front end of a tail pipe includes a screen, a screen rotating shaft to which the screen is fixed and having a screen lever, a first fixed shaft having a second end that is coupled to or separated from a first end of the screen rotating shaft, and an axial side extension part with a temperature sensitive length extension and contraction part that is opposite to the screen lever, a second fixed shaft having a return spring, a rotary stopper coupled to the screen rotating shaft, and a first fixing plate located inside the front end of the tail pipe and deformed to fix the rotary stopper or to pass the fixed rotary stopper in an opposite direction, wherein each of the first end and the second end is inclined to a side.

A device for screening a NO.sub.x sensor provided on a front end of a tail pipe includes a screen, a screen rotating shaft to which the screen is fixed and having a screen lever, a first fixed shaft having a second end that is coupled to or separated from a first end of the screen rotating shaft, and an axial side extension part with a temperature sensitive length extension and contraction part that is opposite to the screen lever, a second fixed shaft having a return spring, a rotary stopper coupled to the screen rotating shaft, and a first fixing plate located inside the front end of the tail pipe and deformed to fix the rotary stopper or to pass the fixed rotary stopper in an opposite direction, wherein each of the first end and the second end is inclined to a side.

The present invention relates to an improved turbocharger assembly, particularly of the variable geometry type. The improved turbocharge assembly contains a turbine. The turbine includes an impeller housed in a casing, a flange that can be sealingly associated with a corresponding flange of an exhaust gas manifold of an engine, and a clapet valve that contains a shutter element and a housing seat. The housing seat is fashioned in a frame made in one piece with the casing.

The present invention relates to a method for preventing an SCR catalyst from being contaminated with platinum group metal in an emission control system comprising, upstream of the SCR catalyst, a catalyst that contains platinum group metal, characterized in that a material zone containing a mixture of aluminum oxide and cerium oxide is located upstream of the SCR catalyst.

Provided is an injection device capable of suppressing the deposition of white products and performing an exhaust gas purification treatment. This injection device is provided with: an injection unit which is provided upstream of a selective reduction-type catalyst device provided inside an exhaust pipe constituting an exhaust passage of an internal combustion engine, and injects a urea aqueous solution or a diethylamine aqueous solution; a determination unit which determines whether white products derived from the urea aqueous solution injected by the injection part are deposited.

A SCR doser includes an electrical adapter extending from an inner end electrically connected to the pins of a solenoid to an outer end having electrical terminals. The outer end outwardly protrudes from an aperture provided in a base wall of the housing of the SCR doser.

The invention relates to a delivery module (1) for a metering system for metering a reducing agent, in particular an aqueous urea solution, into an exhaust gas section of a motor vehicle, comprising a pump (2) which is connected or can be connected to a reducing agent storage tank (4) on the suction side via a suction line (3) and to a metering module (6) on the pressure side via a delivery line (5), wherein a return line (7) which leads back into the storage tank (4) branches off from the delivery line (5). According to the invention, a filter (8) is integrated into the delivery module (1) on the suction side. The invention additionally relates to a metering system comprising such a delivery module (1).

A secondary air system for an aircraft engine comprises an air flow path communicating between a source of pressurized cooling air and an air consuming component. A filter is disposed in the air flow path upstream from the air consuming component. The filter has at least one of: openings of a size selected for capturing suspended particles; and a filter surface material for binding with chemical contaminants.