The present invention shows a combustion engine comprising an exhaust gas aftertreatment system having at least one injector for injecting a reductant into an exhaust gas passage, and an emergency stop that cuts down the energy supply of the components of the engine upon activation, wherein the combustion engine comprises an injector extraction system that extracts the injector from the exhaust gas passage when the emergency stop is activated.

A reductant delivery unit (RDU) for a selective catalytic reduction system, including a housing; a fluid inlet disposed at an upper portion of the housing; a fluid return outlet; a fluid nozzle outlet disposed at a lower portion of the housing; an injector disposed within the housing and configured to receive fluid from the fluid inlet and selectively discharge the fluid from the fluid nozzle outlet; and at least one fluid passageway disposed within or around the housing. The fluid passageway provides fluid communication along a first fluid path between the fluid inlet and the fluid nozzle outlet and along a second fluid path between the fluid inlet and the fluid return outlet so that the same fluid discharged by the injector is also used as a coolant for the RDU.

A dosing control system includes a shut-off valve, a reductant pump, a reductant injector, and a recirculation conduit. The shut-off valve is configured to receive reductant from a reductant tank. The reductant pump is configured to selectively receive the reductant from the shut-off valve. The reductant pump is configured to selectively be in a reductant pump command state. The reductant injector is configured to selectively receive the reductant from the reductant pump. The recirculation conduit is coupled to the reductant injector and the reductant tank. The recirculation conduit is configured to selectively provide the reductant from the reductant injector to the reductant tank. The shut-off valve is configured to prevent a flow of the reductant to the reductant pump when the reductant pump is not in the reductant pump command state.

A cooling device for a reducing agent injection module, includes a reducing agent injection module installed in an exhaust pipe to inject a reducing agent into the exhaust pipe and having a module cooling channel therein through which a coolant flows to cool the reducing agent injection module, a coolant pump configured to supply the coolant to the module cooling channel, a coolant circulation line including a coolant supply line and a coolant recovery line to connect the coolant pump and the module cooling channel, and a coolant recovery portion installed in the coolant recovery line to store the coolant flowing through the reducing agent injection module and positioned higher than the reducing agent injection module along a gravitational direction.

Systems and apparatuses include a de-aeration tank for an engine system. The de-aeration tank including a single internal volume defined by walls, a diesel exhaust fluid (DEF) doser port configured to communicate coolant with a DEF doser module, and engine coolant ports configured to communicate coolant with an engine coolant system.

In a urea injection system of a vehicle, to detect the shortage of the cooling water by using an electric water pump (EWP) to cool a dosing injector during the running of the vehicle engine, the apparatus for detecting shortage of the cooling water in the vehicle includes a urea injector that injects urea into an exhaust pipe of the vehicle, a pump that cools the urea injector, and a controller that applies a reference current to the pump, measures a time taken until a revolutions per minute (RPM) of the pump reaches a reference RPM, and detects the shortage of the cooling water in the pump by comparing the measured time and a reference time.

A coolant control system of a vehicle includes a coolant pump that pumps coolant to a second radiator that is different than a first radiator that receives coolant from an engine of the vehicle. A diesel exhaust fluid (DEF) injector injects a DEF into an exhaust system and receives coolant output from the second radiator. A fuel heat exchanger transfers heat between coolant and fuel flowing therethrough. An engine control module is configured to determine a temperature of the DEF injector, control a duty cycle of the coolant pump, determine a vaporized condition of the coolant based on a DEF injector temperature, optionally further, in response to determining a vaporized condition of the coolant, implement a vapor purge by oscillating the duty cycle of the coolant pump, and optionally further identify a low-coolant condition of the coolant control system based on the vapor purges implemented during a time period.

An injector is provided to inject an aqueous urea solution into an exhaust line. The injector comprises a single fluid inlet, an injection passage, fluidly connecting the inlet to the injection port, and a shut-off device for the injection port. The shut-off device further comprises an actuator that is configured to selectively move a shutter between open and closed positions. A cooling passage is fluidly connected to the injection passage and is configured to cool the actuator. A fluid pressure regulator is interposed in the cooling passage.

The invention relates to a metering device (10) for introducing a process liquid or auxiliary agent into a flow pipe of an internal combustion engine, in particular for introducing a reducing agent into an exhaust gas pipe (12). Said device comprises an injection valve (22) and a receiving device (50) comprising a heat sink element (46) and a cover element (48). The injection valve (22) and the receiving device (50) are combined to form a structural unit by means of bonded connections (62, 64).

An exhaust duct for a fossil fuel powered engine includes an exhaust gas passage, a cooling fluid passage, a mixing device for mixing cooling fluid with the hot exhaust gas and a selective catalytic reduction catalyst for removing nitrogen oxides arranged in the exhaust gas passage. The mixing device has a mixing chamber with a first wall and an opposed second wall, the first and second wall arranged upstream of the selective catalytic reduction catalyst in the exhaust gas passage and extending over the cross-sectional area of the exhaust gas passage, both walls perforated by through holes, wherein through holes of the first wall are connected with through holes of the second wall in pairs by pipes extending through the mixing chamber, the pipes perforated by at least one hole into the mixing chamber and the cooling fluid passage ending into the mixing chamber.