A method for diagnosing an aftertreatment component, wherein nitrogen oxide is reduced using a first catalytic converter upstream said aftertreatment component and a second catalytic converter downstream said aftertreatment component, said aftertreatment component oxidizing nitric oxide into nitrogen dioxide. A first sensor measure nitrogen oxide downstream said first catalytic converter but upstream said aftertreatment component, and a second sensor measure nitrogen oxide downstream said aftertreatment component. The method includes: supplying additive upstream said first catalytic converter; using said first and second sensors, performing a first measurement at a first temperature of said first aftertreatment component; using said first and second sensors, performing a second measurement at a second temperature of said first aftertreatment component; and diagnosing oxidation of nitric oxide into nitrogen dioxide in said aftertreatment component using said first and second measurements.

The present invention relates to a method for correcting a supply of additive to an exhaust gas stream resulting from combustion in an internal combustion engine. A first aftertreatment component being arranged for oxidation of nitric oxide into nitrogen dioxide, and a reduction catalytic converter being arranged downstream said first aftertreatment component. Additive is supplied to said exhaust gas stream for reduction of nitrogen oxides in said reduction catalytic converter, the additive being supplied in proportion to an occurrence of nitrogen oxides in said exhaust gas stream, said proportion being subject to correction. The method includes: supplying unburned fuel to said exhaust gas stream upstream said first aftertreatment component to reduce oxidation of nitric oxide into nitrogen dioxide in said first aftertreatment component, and correcting said supply of additive to said exhaust gas stream when supplying unburned fuel to said exhaust gas stream.

An exhaust gas treatment system for an internal combustion engine includes an exhaust gas pathway that receives exhaust gas from the engine, a temperature sensor configured to generate a temperature signal associated with a temperature of the exhaust gas at a position along the exhaust gas pathway, and a reductant source. The system also includes first and second injectors in fluid communication with the reductant source. The first and second injectors are configured to inject reductant into the exhaust gas pathway at first and second rates. The system also includes a first treatment element positioned downstream of the first injector and within the exhaust gas pathway, and a controller in communication with the temperature sensor. The controller is configured to receive the temperature signal from the temperature sensor and adjust at least one of the first rate or the second rate based at least in part on the temperature signal.

A catalyst state estimation apparatus includes a first sensor, a memory and a processor. The first sensor is configured to acquire information about a catalyst that removes a toxic substance in an exhaust gas, the first sensor being provided in a main passage into which the exhaust gas flows from an internal combustion engine. The memory is configured to previously store a catalyst state estimation model that includes at least one mathematical model. The processor is configured to estimate a removal performance of the catalyst by applying the information about the catalyst acquired by the first sensor to the catalyst state estimation model.

Apparatuses, systems, and methods are disclosed for emissions control. An emissions monitor module measures at least one pollutant level for an exhaust gas flow produced by a combustion source and treated by a pollution control device. The at least one pollutant level may be controllable based on at least one combustion source operating parameter and at least one pollution control device operating parameter. A control module controls the at least one combustion source operating parameter and the at least one pollution control device operating parameter based on the at least one measured pollutant level.

A method for diagnosing an aftertreatment component, wherein nitrogen oxide is reduced using a first catalytic converter upstream said aftertreatment component and a second catalytic converter downstream said aftertreatment component, said aftertreatment component oxidizing nitric oxide into nitrogen dioxide. A first sensor measure nitrogen oxide downstream said first catalytic converter but upstream said aftertreatment component, and a second sensor measure nitrogen oxide downstream said aftertreatment component. The method includes: supplying additive upstream said first catalytic converter; using said first and second sensors, performing a first measurement at a first temperature of said first aftertreatment component; using said first and second sensors, performing a second measurement at a second temperature of said first aftertreatment component; and diagnosing oxidation of nitric oxide into nitrogen dioxide in said aftertreatment component using said first and second measurements.

The present invention relates to a method for correcting a supply of additive to an exhaust gas stream resulting from combustion in an internal combustion engine. A first aftertreatment component being arranged for oxidation of nitric oxide into nitrogen dioxide, and a reduction catalytic converter being arranged downstream said first aftertreatment component. Additive is supplied to said exhaust gas stream for reduction of nitrogen oxides in said reduction catalytic converter, the additive being supplied in proportion to an occurrence of nitrogen oxides in said exhaust gas stream, said proportion being subject to correction. The method includes: supplying unburned fuel to said exhaust gas stream upstream said first aftertreatment component to reduce oxidation of nitric oxide into nitrogen dioxide in said first aftertreatment component, and correcting said supply of additive to said exhaust gas stream when supplying unburned fuel to said exhaust gas stream.

An internal combustion engine system includes: an internal combustion engine mounted on a vehicle; a NOx selective reduction catalyst; a reducing agent supply device including a urea water addition valve configured to add urea water into the exhaust gas passage upstream of the NOx selective reduction catalyst, a urea water tank, a urea water flow passage that connects the urea water addition valve and the urea water tank, and a pump configured to supply the urea water addition valve with the urea water from the urea water tank; and a control device. The control device is configured to perform a runoff reduction control that controls at least one of the reducing agent supply device and the internal combustion engine such that the amount of runoff of the urea water from the urea water tank becomes less when the tilt angle of the vehicle is large than when it is small.

A flowhood assembly 1 comprises an injector 30 which is fixable to a mount 50 in a number of alternative mounted positions defined by rotation of the injector about an injection axis X2 relative to the mount, The injector 30 includes one or more coolant ports 34, 35 which are connected in use to a supply of liquid coolant C. The mount 50 is fixable to a flowhood 10 in an upright, design orientation and in alternative connected positions defined by rotation of the flowhood 10 relative to the mount 50 about a connection axis X1. In a normal use position of the assembly the connection axis X1 of the flowhood is arranged at a predefined angle, optionally 0, relative to a nominal horizontal plane P1. The injector 30 is not fixable to the mount 50 other than in the alternative mounted positions. In use in the normal use position, and in each of the alternative mounted positions of the injector, the injection axis X2 of the injector is oriented downwardly away from the injector relative to the horizontal plane P1, and at least one of the coolant ports 34, 35 is arranged above the horizontal plane P1 which passes through the injection axis X2 at an outlet end 32 of the nozzle.

A combustion device burns a fuel in a combustion chamber by using combustion air. The device includes a reducing agent injection device which includes an injection port and injects a predetermined reducing agent from the injection port toward a region having a low oxygen concentration in a flame in the combustion chamber, in which the reducing agent injection device changes a distance of the injection port with respect to the flame in accordance with an injection amount of reducing agent.