An internal combustion engine comprises a hydrocarbon feed valve (15) arranged in an engine exhaust passage and a booster pump (60) for boosting an injection pressure of the hydrocarbon feed valve (15). The hydrocarbon feed valve (15) performs NO.sub.X removal injection and clogging prevention injection. A boosting action of the injection pressure by the booster pump (60) and the NO.sub.X removal injection are controlled so that the boosting action of the injection pressure by the booster pump (60) and the NO.sub.X removal injection are not performed simultaneously, and the boosting action of the injection pressure by the booster pump (60) and said clogging prevention injection are allowed to be performed simultaneously.

Systems and methods directed at removing HCN from an FCC process flue gas (and/or generated in the catalyst system reactions themselves) such that the final HCN output is satisfactory; while, in so doing, avoiding undesirable levels of other pollutants contained in that exhaust gas such as NOx. A system includes an assembly having a fluid catalytic cracking (FCC) unit generating a flue gas with HCN and NOx and a catalyst device placed in the flue gas line to remove HCN and NOx. The catalyst device having one or more SCR catalytic articles, as in one free of platinum group metal material (PGM) or a dual functioning SCR catalyst with PGM, or a combination of each. The assembly can be provided with an ammonia supplier and optionally an H2O supplier with associated injection for supply into the flue gas upstream of a catalytic article(s).

A system for diagnosing and/or determining the performance of a reductant delivery system may include determining a flow rate offset value for the reductant delivery system. A reduced reductant flow rate may be determined for a reductant dosing command value based, at least in part, on the determined flow rate offset when reductant dosing command is non-zero. A reductant flow rate error can be determined based, at least in part, on a difference between an expected reductant flow rate value corresponding to the reductant dosing command value and the determined reduced reductant flow rate. A performance status value indicative of a performance status of the reductant delivery system may be outputted based, at least in part, on the determined first reductant flow rate error and a predetermined threshold.

Embodiments described herein methods can be used in particulate filter regeneration, such as particulate filters used for filtering the exhaust of an engine, e.g., a diesel engine. Systems herein can be configured to dispense combustion gas(es) into housing were a particulate filter is contained and to ignite the combustion gases. Methods for conducting a safety verification process of such systems are disclosed, as well as methods for regenerating the filters. Still other embodiments are described.

A system includes: a reductant injection system for injecting reductant into an exhaust gas based on an injection parameter or a supply parameter; and a controller configured to: access a current engine condition parameter, wherein the current engine condition parameter includes at least one of an engine fuel flow rate, an engine air flow rate, an engine boost pressure, an engine intake pressure, an engine load, an engine rotational speed, an engine cylinder temperature, an engine cylinder pressure, or an engine fuel pressure, determine one or more control parameters based on a control model and as a function of the accessed current engine condition parameter, and modify a value of the injection parameter or the supply parameter based on the one or more control parameters to control a reductant spray momentum, a reductant droplet momentum, or a reductant momentum vector.

A motor vehicle includes an internal combustion engine, an after-treatment device to treat first exhaust gases produced by the internal combustion engine, a first exhaust line configured to feed the first exhaust gases to the after-treatment device, combustion means configured to produce second exhaust gases with a combustion chamber and an injector device that can be controlled to inject the fuel into the combustion chamber, a second exhaust line configured to feed the second exhaust gases to the after-treatment device, a tank to hold the fuel, and a supply line configured to feed a fuel stream from the tank to the injector device, the supply line comprising a valve that can be controlled according to at least one first control mode and a second control mode, wherein the valve respectively allows and prevents a fuel flow passage to the injector device.

A system and method for determining a value of a flow rate of a liquid in a vehicle engine system comprising a fluid tank (3), a pump (2), a fluid injector (1), with a fluid flow path from the pump to an injected zone (4), and an electronic control unit (5) for controlling opening of the injector, the method comprising:providing a loss estimation module (52), supplying as output a hydraulic loss coefficient (CP),carrying out a plurality of sequences of fluid injection, with values of a plurality of parameters (dP, P1, P0, T, X) being collected,calculating a theoretical quantity (QTH) of fluid injected during these injection sequences, with the aid of the values of the parameters (P1, P0, T, X),calculating an estimated actual quantity (QRE) of fluid injected during the injection sequences, by applying the loss coefficient (CP) to the calculation of the theoretical quantity of fluid.

A system for treating exhaust gas of a vessel having at least one engine equipped with a turbocharger includes a storage tank configured to store a powder for treating the exhaust gas, and a dosing assembly fluidly coupled to the storage tank. The dosing assembly is configured to inject the powder into the exhaust gas at or adjacent the turbocharger, and includes a nozzle for injecting the powder into the exhaust gas. The nozzle includes a conduit configured to transport the powder, and a conical member mounted to a distal end of the conduit and defining a central hole in fluid communication with the conduit for guiding a first portion of the powder through the central hole. The distal end of the conduit and the conical member together define an annular gap configured to guide a second portion of the powder through the annular gap.

A method for controlling the operation of a hydrogen combustion engine system of a vehicle. The hydrogen combustion engine system has a hydrogen combustion engine and an EATS to reduce emissions in the engine exhausts. The EATS has a selective catalyst reduction, SCR, catalyst and an ammonia slip catalyst, ASC, arranged downstream of the SCR catalyst. The method comprises: determining the temperature of the SCR catalyst; determining the temperature of the ASC; in response of determining that the temperature of the SCR catalyst is below a predetermined SCR temperature threshold value, and that the temperature of the ASC is below a predetermined ASC temperature threshold value, operating the hydrogen combustion engine in an H2 exhaust excess mode defined by an amount of unburnt H2 of at least 0.2 mol % in the engine exhausts, and using the unburnt H2 in the engine exhausts as a reductant for NOx conversion in the ASC.

In one instance, disclosed herein is an aftertreatment regeneration system comprising: an aftertreatment system; a temperature sensor operative to monitor a temperature of the aftertreatment system; a hydrocarbon doser operatively coupled to the aftertreatment system; and a model predictive controller operative to: receive an aftertreatment regeneration request; receive temperature information generated by the temperature sensor; generate, based on the aftertreatment regeneration request and the temperature information generated by the temperature sensor, a predicted future state of the aftertreatment system; and generate, based on the aftertreatment regeneration request, the temperature information generated by the temperature sensor, and the predicted future state of the aftertreatment system, a control command for actuating the hydrocarbon doser.