An exhaust gas sensor arrangement structure includes a catalyst which purifies exhaust gas of an engine; and exhaust gas sensors which detect an exhaust gas component of the engine; the catalyst is provided under the engine; and the exhaust gas sensors are provided within a width of the engine in a front/rear direction so that the catalyst is provided between the exhaust gas sensors at front and rear sides of the catalyst.

A method for an SCR system comprising a dosing unit (250) for dosing reducing agent into an engine exhaust duct (290) upstream of a SCR catalytic converter (270) for reducing the NOx level in an exhaust flow from the engine. The SCR system comprises a pressurizing device (230) for feeding reducing agent from a container (205) to the dosing unit (250) arranged so as to dose reducing agent to the exhaust duct (290) under pressure. The method includes the step of: reducing, during periods of non-continuous dosing of reducing agent during continued maintained operation of the pressurizing device (230), the pressure (s301; s320) of the reducing agent at the dosing unit (250) compared to the pressure during continuous dosing. Also a computer program product containing program code (P) for a computer (200; 210) for implementing a method according to the invention. The invention also concerns an SCR system and a motor vehicle that is equipped with that system.

A method for an SCR system comprising a dosing unit (250) for dosing reducing agent into an engine exhaust duct (290) upstream of a SCR catalytic converter (270) for reducing the NOx level in an exhaust flow from the engine. The SCR system comprises a pressurizing device (230) for feeding reducing agent from a container (205) to the dosing unit (250) arranged so as to dose reducing agent to the exhaust duct (290) under pressure. The method includes the step of: reducing, during periods of non-continuous dosing of reducing agent during continued maintained operation of the pressurizing device (230), the pressure (s301; s320) of the reducing agent at the dosing unit (250) compared to the pressure during continuous dosing. Also a computer program product containing program code (P) for a computer (200; 210) for implementing a method according to the invention. The invention also concerns an SCR system and a motor vehicle that is equipped with that system.

Provided is a CO.sub.2 recovery device of an internal combustion engine capable of efficiently recovering CO.sub.2 emitted from an internal combustion engine or CO.sub.2 in the air, and of efficiently synthesizing methane using CO.sub.2. A CO.sub.2 recovery device of an internal combustion engine includes a CO.sub.2 capturing material disposed at a through channel of gas including CO.sub.2 to capture CO.sub.2 in the gas, and methanation catalyst to let CO.sub.2 desorbed from the CO.sub.2 capturing material react with H.sub.2 obtained from a H.sub.2 supply source to generate methane. The CO.sub.2 recovery device has a function to raise temperature of the CO.sub.2 capturing material using heat generated from the internal combustion engine to desorb CO.sub.2.

An emission control system for an engine is described herein. The emission control system includes a reductant injector extending into an exhaust conduit upstream of a catalyst, the reductant injector including a reductant passage receiving reductant from a reductant reservoir and a first exhaust gas inlet receiving exhaust gas from the exhaust conduit, a boundary of the first exhaust gas inlet at least partially delineated by an inlet wall extending into an interior exhaust passage from an outer housing surface, the interior exhaust passage adjacent to the reductant passage and receiving exhaust gas from the first exhaust gas inlet and fluidly separated from the reductant passage.

An emission control system for an engine is described herein. The emission control system includes a reductant injector extending into an exhaust conduit upstream of a catalyst, the reductant injector including a reductant passage receiving reductant from a reductant reservoir and a first exhaust gas inlet receiving exhaust gas from the exhaust conduit, a boundary of the first exhaust gas inlet at least partially delineated by an inlet wall extending into an interior exhaust passage from an outer housing surface, the interior exhaust passage adjacent to the reductant passage and receiving exhaust gas from the first exhaust gas inlet and fluidly separated from the reductant passage.

A dump truck includes: a vehicle body; a cooling fan disposed in front of the vehicle body in a travel direction; an engine disposed behind the cooling fan; a platform covering the cooling fan and a top of the engine; an exhaust aftertreatment device disposed behind the engine and above the platform; an opening through which an upper side of the platform communicates with a lower side thereof and provided in front of the exhaust aftertreatment device; and a duct provided to a lower surface of the platform and comprising a base-end opening connected to the opening and a leading-end opening directed to the cooling fan.

A dump truck includes: a vehicle body; a cooling fan disposed in front of the vehicle body in a travel direction; an engine disposed behind the cooling fan; a platform covering the cooling fan and a top of the engine; an exhaust aftertreatment device disposed behind the engine and above the platform; an opening through which an upper side of the platform communicates with a lower side thereof and provided in front of the exhaust aftertreatment device; and a duct provided to a lower surface of the platform and comprising a base-end opening connected to the opening and a leading-end opening directed to the cooling fan.

A straddle-type vehicle comprises a supercharging device which compresses intake-air to be sent to a combustion chamber of an engine; a catalyst provided in an exhaust passage through which an exhaust gas emitted from the engine flows; and a control section which controls the engine, wherein the control section performs an increase suppressing control for suppressing an increase in an exhaust gas temperature, in a case where the control section estimates that the exhaust gas temperature has exceeded an increase suppressing temperature set to be equal to or lower than a catalyst permissible temperature.

A catalyzing reactor comprising a reactor entrance and a reactor exit and an internal structure arranged for flowing a reacting medium through the reactor from the reactor entrance to the reactor exit. The reactor structure comprising at least one thin walled reactor channel arranged between the entrance and the exit of the reactor. The channel having a channel wall that includes a catalyst and that defines a flow path, in which channel in use, a catalyzed exothermic reaction takes place in the medium as it flows along the flow path. The at least one channel is looped to have a portion of its flow path that is downstream with respect to the reactor entrance in heat exchanging contact with a portion of a flow path that is that is more upstream with respect to the reactor entrance, so as to transfer heat between a downstream portion of the reacting medium to an upstream portion thereof.