This NOx reduction control method is for an exhaust gas aftertreatment device having an oxidation catalyst and an LNT catalyst which are disposed in an exhaust pipe and repeating an adsorption or occlusion of NOx which is executed when an air-fuel ratio is in a lean state and a reduction of NOx which is executed when the air-fuel ratio is in a rich state, the method including executing a post-injection or an exhaust pipe injection and causing HC to be adsorbed in the oxidation catalyst when an exhaust gas temperature is low, and causing the HC which is adsorbed in the oxidation catalyst to be desorbed and reducing an adsorbed NOx in the LNT catalyst by raising the exhaust gas temperature during the rich state.

A method (200) for operating an exhaust gas burner (120) in an exhaust section (102) of an internal combustion engine (110), comprising introducing a purging fluid comprising at least air (20) into the exhaust gas burner (120) during a purging operating phase (205), which lies outside the time of a normal operating phase (201) of the exhaust gas burner (120), and discharging a discharge mixture formed using the purging fluid from the exhaust gas burner (120), wherein the exhaust gas burner (120) is operated for the purpose of heating a component (130, 150) of the exhaust section (102) to its operating temperature during the normal operating phase (201). A processor unit (140) and a computer program for carrying out such a method (200) are furthermore proposed.

A burner for an exhaust gas tract that can be flowed through by exhaust gas of an internal combustion engine includes a combustion chamber in which a mixture of air and liquid fuel is to be ignited and combusted and an inner swirl chamber that can be flowed through by a first part of the air and causes a turbulent flow of the first part of the air. The swirl chamber has a first outflow opening that can be flowed through by the first part of the air flowing through the inner swirl chamber and via which the first part of the air can be removed from the inner swirl chamber. The burner further includes an introduction element that can be flowed through by the liquid fuel and via which the fuel can be introduced into the inner swirl chamber.

A burner for an exhaust gas tract that can be flowed through by exhaust gas of an internal combustion engine includes a combustion chamber, in which a mixture comprising air and a liquid fuel is to be ignited and thus to be combusted, and an inner swirl chamber that can be flowed through by a first part of the air. The inner swirl chamber has a first swirl generation device via which a turbulent flow of the first part of the air can be caused and a first outflow opening that can be flowed through by the first part of the air flowing through the inner swirl chamber. The first part of the air being able to be removed from the inner swirl chamber via the first outflow opening.

The invention relates to an exhaust gas aftertreatment system for an internal combustion engine, in particular for a gasoline engine that is spark-ignited by means of spark plugs. A four -way catalytic converter and at least one three-way catalytic converter are situated in an exhaust gas system that is connected to an outlet of the internal combustion engine. An exhaust gas burner with which hot exhaust gas is introducible into the exhaust gas system directly downstream from the four-way catalytic converter is provided at an exhaust duct of the exhaust gas system. The exhaust gas burner is supplied with fresh air by a secondary air pump. The invention further relates to a method for exhaust aftertreatment of an internal combustion engine having such an exhaust gas aftertreatment system.

When it is determined that the initial combustion is unstable, the engine speed is forcibly increased. When the engine speed is forcibly increased, fluidity in the cylinder increases. When the fluidity in the cylinder rises, homogeneity of the homogeneous air-fuel mixture is improved. Therefore, it is possible to enlarge the flame kernel. When the flame kernel is enlarged, the initial flame resulting from the flame kernel is also enlarged. Then, the initial flame becomes easy to involve the closest fuel spray thereby the initial combustion can be stabilized.

The present invention provides up-fit after treatment technology for bringing Heavy-Heavy Duty Diesel (HHDD) engine powered vehicles into compliance with the Title 13 CCR, Part 2025 mandate (meeting 2010 criteria emission standards). It also includes a Dual Fuel system, Exhaust Thermal Management System further reducing: NOx constituents, consumption of diesel fuel, particulate matter and CO2 emissions. The invention further comprises multiple sensors that provide data to electronic control module(s). The APGV6000 enables rapid after-treatment thermal activation, compares real-time sensor data with target data, and adjusts the after treatment system and/or dual fuel system and/or Exhaust Thermal Management system to produce exhaust emissions well below 2010 exhaust emission standards. For 2010 and newer HHDD engine applications, the V6000 comprises the Dual Fuel and exhaust thermal management system to affect rapid after-treatment activation, reduced NOx emissions well below, 2010 (current) standards, reduce diesel fuel usage and reduce CO2 emission.

A method for heating an exhaust pipe in a motor vehicle, comprising including a plurality of spark cycles performed in succession at a preset frequency, wherein each spark cycle includes injecting a-preset fuel quantity into an injection area inside of an exhaust pipe in a motor vehicle and generating at least one spark between the ends of a pair of electrodes located in proximity to the injection area in order to start combustion. Thus, a value of an ionization current flowing between the ends of the pair of electrodes is detected following the extinction of the spark and this ionization current value is compared with a preset reference value. Therefore, the presence of combustion in the spark cycle is determined, if the ionization current value is greater than the preset reference value, or the absence of combustion in the spark cycle, if the ionization current value is lower than the preset reference value.

A burner for an exhaust gas tract that can be flowed through by exhaust gas of an internal combustion engine includes a combustion chamber, in which a mixture comprising air and a liquid fuel is to be ignited and thus to be combusted, and an inner swirl chamber that can be flowed through by a first part of the air. The inner swirl chamber has a first swirl generation device via which a turbulent flow of the first part of the air can be caused and a first outflow opening that can be flowed through by the first part of the air flowing through the inner swirl chamber. The first part of the air being able to be removed from the inner swirl chamber via the first outflow opening.

When it is determined that the initial combustion is unstable, the engine speed is forcibly increased. When the engine speed is forcibly increased, fluidity in the cylinder increases. When the fluidity in the cylinder rises, homogeneity of the homogeneous air-fuel mixture is improved. Therefore, it is possible to enlarge the flame kernel. When the flame kernel is enlarged, the initial flame resulting from the flame kernel is also enlarged. Then, the initial flame becomes easy to involve the closest fuel spray thereby the initial combustion can be stabilized.