A selective catalytic reduction system includes a reducing agent injection module installed in an exhaust pipe through which an exhaust gas is discharged from an engine and configured to inject a reducing agent into the exhaust pipe, a temperature calculator configured to calculate a temperature of the reducing agent injection module using temperature-related information of the reducing agent injection module, and a temperature controller configured to control to increase a reducing agent injection amount of the reducing agent injection module when the calculated temperature.

An aftertreatment system (100) connected downstream an internal combustion engine arrangement (102) for receiving combustion gas exhausted from the internal combustion engine arrangement (102) during operation thereof, the aftertreatment system (100) comprising a primary aftertreatment system (104) comprising a first catalytic reduction arrangement (106); a secondary reduction system (108) comprising a second catalytic reduction arrangement (110).

The present application provides a reductant dosing system for an SCR catalyst comprising an injector, a storage tank and a reductant pump arranged in a first fluid line between the storage tank and the injector for pumping reductant from the storage tank to the injector. The reductant dosing system comprises pressurizing means for pressurizing the storage tank.

The invention relates to a cooling element (38; 40) for an injection valve (1; 41), in particular for injecting a liquid reduction agent into an exhaust train of a combustion engine, having a hollow region for receiving a section of the injection valve (1; 41) and a cooling plate (8) which is circumferential around the hollow region and a face plate (7) arranged on a face of the injection valve (1; 41) which has at least one injection opening (13), which enables the spraying of liquid out of the injection valve (1; 41) through the face plate (7). The face plate (7) has at least one bowl-shaped region (7a) formed having a front wall and at least one side wall which is designed to receive an injection-side section (1a; 41a) of the injection valve (1; 41), and the cooling plate (8) and the face plate (7) are connected to each other in a liquid-tight manner such that, in a state in which a section of an injection valve (1; 41) is properly arranged in the hollow region, a cooling volume (36) circulating around the section of the injection valve (1; 41) is delimited by the face plate (7), the cooling plate (8) and the injection valve (1; 41).

An object is to prevent abrasion inside an addition valve and clogging of the addition valve due to an increase in the particle diameter of precipitates. A first control is performed by which a pump is caused to operate in such a way as to return urea solution contained in the addition valve and a urea solution channel to a tank by a predetermined quantity. After the lapse of a certain time after the end of the first control, a second control is performed by which the pump is caused to operate in such a way as to return the urea solution remaining in the addition valve and the urea solution channel thoroughly to the tank.

An injector mounting assembly for supporting an injector is described. The injector mounting assembly includes an upstream wall and a downstream wall coupled to the upstream wall. The injector mounting assembly further includes a thermoelectric cooler coupled to at least one of the upstream wall and the downstream wall. The thermoelectric cooler is disposed in thermal contact with the injector and configured to exchange heat with the injector.

An automotive exhaust aftertreatment system includes a doser. The doser includes a doser body and a valve system that opens to discharge a reagent into exhaust gas. The doser includes a heater to heat the reagent prior to releasing the reagent into the exhaust gas.

A fluid injector comprising a coil arranged to drive a pump from a first state to a second state when energized, so as to pump a dosing fluid; a PN junction electrically arranged across the coil to discharge energy stored in the coil when the voltage across the coil is above a threshold. In one particular embodiment, the fluid injector is a selective catalytic reduction dosing fluid injector.

To provide an exhaust purifying system and a method for controlling the exhaust purifying system that avoid occurrence of clogging, breakage, or the like of a reducing agent injection valve caused by the solidification of a reducing agent and prevent reduction in the efficiency of reducing agent recovery processing and exhaust gas purification. An exhaust purifying system and a method for controlling the exhaust purifying system according to an aspect of the present invention is configured to detect the injection valve temperature of the reducing agent injection valve according to detection of turn-off of an ignition switch for stopping the internal combustion engine or detection of an injection stop of the reducing agent injection valve, whichever is earlier, calculate the waiting time until reducing agent recovery processing starts based on the injection valve temperature, and permits the reducing agent recovery processing under condition of the detection of turn-off of the ignition switch and an elapse of the waiting time.

An exhaust aftertreatment system for use with an over-the-road vehicle is disclosed. The exhaust aftertreatment system includes a flash-boil doser mounted to an exhaust conduit and a catalyst coupled to the exhaust conduit. The flash-boil doser configured to inject heated and pressurized reducing agent into an exhaust passageway defined by the exhaust conduit for distribution throughout exhaust gases passed through the exhaust conduit. The catalyst configured to react the reducing agent with the nitrous oxide in the flow of exhaust gases to provide treated exhaust gases with a reduced nitrous oxide amount.