A urea removing apparatus has: a determining section that determines whether or not a urea aqueous solution is injected from an injection nozzle when control is performed to inject the urea aqueous solution from the injection nozzle into an exhaust pipe where exhaust gas of an engine flows; a supply control section that controls a pump that supplies the urea aqueous solution to the injection nozzle from a tank that stores the urea aqueous solution, and causes the urea aqueous solution to be supplied from the tank to the injection nozzle in a case that it is determined that the urea aqueous solution is not injected from the injection nozzle; and a temperature control section that performs control to raise the temperature of exhaust gas in a state where the urea aqueous solution supplied from the tank has been poured into the injection nozzle.

The invention relates to a connecting piece (6) for fluid lines of an exhaust gas aftertreatment system (1), comprising a hollow body (6a) having at least three fluid connection points (14, 15), which are fluidically connected to each other in the hollow body (6a), at least two of the fluid connection points (15) being separated from a third fluid connection point (14) by means of respective membranes (19), each membrane (19) being permeable to a liquid and, when wetted by the liquid, being impermeable to a gas.

A reductant dosing system includes: a doser; a fixed displacement pump in fluid communication with the doser; a reductant source in fluid communication with the fixed displacement pump; and a controller communicatively coupled to the fixed displacement pump to control operation of the fixed displacement pump, wherein the controller is programmed to operate the fixed displacement pump using a pressure control system responsive to data indicative of the doser not dosing reductant and the controller is programmed to operate the fixed displacement pump using a flow control system responsive to data indicative of the doser dosing reductant.

An aftertreatment system includes a reductant source, a junction, a dosing pump module, a valve assembly, and a dosing module. The reductant source stores reductant. The junction receives the reductant from the reductant source. The dosing pump module receives the reductant from the junction and selectively provides the reductant to a first conduit. The valve assembly receives the reductant from the first conduit. The valve assembly is operable between a first state, where the valve assembly provides the reductant to the junction, and a second state, where the valve assembly provides the reductant to a second conduit. The dosing module receives the reductant from the second conduit when provided by the valve assembly. The dosing module is configured to dose exhaust gases with the reductant when provided by the valve assembly.

A boiler or other fired vessel includes a housing with a burner at one end, a furnace downstream of the burner, a convection section downstream of the furnace and a flue gas outlet downstream of the convection section. A first means for loading a reducing agent comprising at least two injectors is located downstream of the furnace. A second means for loading a reducing agent is located downstream of the first means for loading a reducing agent. A selective catalytic reduction catalyst is located either downstream of the second means for loading a reducing agent or adjacent the second means for loading a reducing agent such that the catalyst is provided to the boiler or other fired vessel approximately simultaneously with the reducing agent from the second means for loading the reducing agent.

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).

The invention concerns a method (200) of detecting an emulator for an SCR catalytic converter system (10) with the following steps: operating the SCR catalytic converter system (10) in a test state; and measuring a test variable of the SCR catalytic converter system (10); and deciding whether the test variable is behaving as for an SCR catalytic converter system (10) with or without an emulator.

A controller configured to be operatively coupled to a reductant insertion assembly comprising a first pump for inserting a reductant into a selective catalytic reduction system, is programmed to set an insertion interval timer for the first insertion interval in response to receiving a first insertion command. The controller starts the insertion interval timer, records an elapsed time period from the start of the insertion interval timer, and activates the first pump when the timer starts. The controller receives a second insertion command comprising information for activating the first pump for a second duty cycle for second insertion intervals different than the first insertion interval. If the second insertion interval is smaller than the recorded elapsed time period, the insertion interval timer is set for the second insertion interval, the insertion interval timer is started, and if not already activated, the first pump is activated for the second duty cycle.

An auxiliary system with purge control automatically supplies diesel exhaust fluid (DEF) to an onboard DEF tank of a diesel engine to enable prolonged unattended operation. The system includes an auxiliary DEF tank, an auxiliary DEF supply line, a controller, a pump, an air inlet, and a three-way valve configured to switch the pump inlet between the auxiliary DEF tank and air. In response to low-level DEF, the pump delivers DEF through the supply line to replenish the onboard DEF tank. The controller may automatically calculate onboard DEF tank volume based on the delivered volume of DEF, and DEF level data received from an ECM, to enable replenishment control regardless of engine make and model. In response to high-level DEF, engine stoppage, or other system fault, the controller switches the valve to air and runs the pump for a predetermined time to purge DEF from the supply line. The auxiliary system may be skid-mounted, portable, and configured to supply DEF to multiple diesel engines.

A reagent dosing system includes an injector having an outlet configured to be in fluid communication with the exhaust conduit; a reagent tank configured to hold a volume of reagent; a water tank configured to hold a volume of water; and a means for 1) pumping reagent from the reagent tank to the injector for injection of reagent into the exhaust conduit and 2) pumping water from the water tank to the injector for flushing residual reagent from the injector.