Volkswagen Ag

Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Volkswagen Akiihngesellschaft

Volkswagen Akitengesellschaft

Stefan Paukner

Ekkehard Pott

Falk-Christian Baron Von Ceumern-Lindenstjerna

Michael Kaack

Michael Manz

Johannes Westendorf

Asmus Carstensen

Christoph Nee

Thomas Maischik

André Horn

Sebastian Hemminger

Lars Schlüter

Falk-Christian Von Ceumern-lindenstjerna

Hardy Naumann

Jens Gockel

Lea Maria Lamminger

Bernd Hupfeld

Frank-michael Wittig

Dennis Achenbach

Tolga Bozalp

Falk-Christian Baron Von Ceumern-Lindenst Jerna

Baron Falk-Christian Von Ceumern-Lindenstjerna

Stephan Kraus

Michael Alexander Manz

Boris Deegen

Frank Dorer

Stefan Wendenburg

A method for operating a hybrid drive system of a motor vehicle, in which an internal combustion engine with a belt-driven starter generator coupled thereto is operated in an overrun mode for braking of the motor vehicle, wherein, in order to avoid a delivering of air to an exhaust system of the hybrid drive system, the internal combustion engine is configured in such a manner that intake valves and/or exhaust valves of the internal combustion engine remain closed during a rotation of a crankshaft of the internal combustion engine. A hybrid drive system for a motor vehicle and a motor vehicle having a hybrid drive system are also provided.

Method for operating a hybrid drive system of a motor vehicle, hybrid drive system, and motor vehicle

A method for operating a hybrid drive system of a motor vehicle, in which an internal combustion engine with a belt-driven starter generator coupled thereto is operated in an overrun mode for braking of the motor vehicle, wherein, in order to avoid a delivering of air to an exhaust system of the hybrid drive system, the internal combustion engine is configured in such a manner that intake valves and/or exhaust valves of the internal combustion engine remain closed during a rotation of a crankshaft of the internal combustion engine. Also provided is a hybrid drive system for a motor vehicle and to a motor vehicle having a hybrid drive system.

An exhaust gas aftertreatment system for an internal combustion engine has an exhaust system that can be connected to an outlet of the internal combustion engine. A three-way catalytic converter that is situated close to the engine and, downstream from the three-way catalytic converter that is situated close to the engine, a second catalytic converter and a particle reduction device are arranged in the direction in which an exhaust gas of the internal combustion engine flows through an exhaust gas channel of the exhaust system. A fuel injector is arranged on the exhaust gas channel so as to inject fuel downstream from the three-way catalytic converter that is situated close to the engine and upstream from the second catalytic converter, and the exhaust system comprises a secondary air system with which secondary air can be blown into the exhaust gas channel downstream from the three-way catalytic converter that is situated close to the engine and upstream from the second catalytic converter.

Exhaust gas aftertreatment system and method for exhaust gas aftertreatment in an internal combustion engine

A device for exhaust gas aftertreatment in an internal combustion engine can be connected to an outlet of the internal combustion engine. The device comprises an exhaust gas system with an exhaust gas channel in which a three-way catalytic converter is arranged, and an exhaust gas burner with which hot burner exhaust gases can be fed into the exhaust gas channel at a feed point upstream from the three-way catalytic converter. The three-way catalytic converter is configured as a lambda probe catalytic converter and comprises a first catalyst volume and a second catalyst volume, whereby a lambda probe is arranged downstream from the first catalyst volume and upstream from the second catalyst volume, whereby the first catalyst volume has a lower oxygen storage capacity than the second catalyst volume. A method for exhaust gas aftertreatment in an internal combustion engine has such an exhaust gas aftertreatment device.

Method and device for exhaust gas aftertreatment in an internal combustion engine

An exhaust gas aftertreatment system for an internal combustion engine, which comprises an exhaust system which can be connected to the outlet of an internal combustion engine. A catalytic converter close to the engine and a second catalytic converter arranged downstream of the catalytic converter in an underbody of a motor vehicle are provided in the flow direction of an exhaust gas from the internal combustion engine flowing through an exhaust gas duct of the exhaust system. An inlet point for secondary air, an exhaust gas burner, and a fuel injector for introducing fuel into the exhaust gas duct are arranged downstream of the catalytic converter close to the engine and upstream of the second catalytic converter. According to the invention, the exhaust gas burner is activated immediately after the internal combustion engine is started in order to heat the second catalytic converter to its light-off temperature. Once the second catalytic converter has reached its light-off temperature, secondary air and fuel are additionally introduced into the exhaust gas duct and are exothermically reacted on the second catalytic converter in order to support the heating of the second catalytic converter.

Exhaust gas aftertreatment system, and method for the exhaust gas aftertreatment of an internal combustion engine

The invention relates to a method for regenerating a particulate filter in the exhaust gas channel of an internal combustion engine. Here, the particulate filter is divided into several zones for determining the loading state, and, at the same time, a temperature distribution over the cross section of the particulate filter is determined. In order to prevent the soot retained in the edge zones of in the particulate filter from being insufficiently oxidized, when it is ascertained that the edge zones have been sufficiently loaded, the exhaust gas temperature is raised to a temperature which, in spite of the heat losses in the edge areas, lies above the temperature at which oxidation of the soot particles can take place. The invention further relates to an internal combustion engine having an exhaust gas channel and a particulate filter arranged in the exhaust gas channel, said internal combustion engine being configured to carry out such a method.

Method for regenerating a particle filter

The invention relates to an exhaust gas aftertreatment system for an internal combustion engine (), in particular for an internal combustion engine () which is charged by means of a turbocharger () and spark-ignited by means of spark plugs (). A particulate filter () and an electrically heatable three-way catalytic converter () downstream of the particulate filter () are arranged in a position close to the engine in an exhaust gas system () connected to an outlet () of the internal combustion engine (). A further three-way catalytic converter () is arranged in the underbody position of the motor vehicle downstream of the electrically heatable catalytic converter (). According to the invention, the electrically heatable three-way catalytic converter () is heated electrically after engine start, and the particulate filter (), the electrically heatable three-way catalytic converter () and the further three-way catalytic converter are additionally heated by the exhaust gas flow from the internal combustion engine (). The electric heating of the electrically heatable three-way catalytic converter () is switched off when the electrically heatable three-way catalytic converter () has reached its light-off temperature.

System and method for exhaust gas aftertreatment of an internal combustion engine

A method for heating a catalytic converter in an exhaust system of an internal combustion engine, in which an exhaust gas burner for heating the catalytic converter is arranged, upstream of the catalytic converter. A lambda probe for controlling the combustion air ratio of the exhaust gas burner is arranged immediately downstream of the exhaust gas burner and upstream of the catalytic converter. The method includes operating the internal combustion engine with a stoichiometric combustion air ratio (&#x3bb;=1), activating the exhaust gas burner, which is operated alternately with a substoichiometric combustion air ratio (&#x3bb;&#x3c;1) and a superstoichiometric combustion air ratio (&#x3bb;&#x3e;1), wherein from the substoichiometric combustion air ratio (&#x3bb;&#x3c;1) to the superstoichiometric combustion air ratio (&#x3bb;&#x3e;1) as soon as a rich breakthrough is detected by the second lambda probe (), and wherein a switchover from the superstoichiometric combustion air ratio (&#x3bb;&#x3e;1) to the substoichiometric combustion air ratio (&#x3bb;&#x3c;1) takes place as soon as a lean breakthrough is detected by the second lambda probe.

Method for heating a catalytic converter and exhaust gas aftertreatment system

The invention relates to an exhaust gas aftertreatment system for a spark ignition internal combustion engine based on the Otto principle. The internal combustion engine is connected on the outlet side to an exhaust gas system, wherein an electrically heatable three-way catalytic converter, a four-way catalytic converter downstream from the electrically heatable three-way catalytic converter, and a further three-way catalytic converter downstream from the four-way catalytic converter are situated in the exhaust gas system in the flow direction of an exhaust gas through the exhaust gas system. Before the internal combustion engine is started, the electrically heatable three-way catalytic converter and preferably also the four-way catalytic converter are heated to allow efficient exhaust gas aftertreatment of the untreated emissions of the internal combustion engine upon starting the internal combustion engine. The exhaust gas aftertreatment system is also configured to allow efficient conversion of the pollutants also during a regeneration of the four-way catalytic converter, and thus, to ensure particularly low emissions in all operating states of the motor vehicle.

System and method for exhaust-gas aftertreatment of an internal combustion engine

An exhaust gas aftertreatment system for an internal combustion engine charged by an exhaust gas turbocharger and spark-ignited by means of spark plugs has a particulate filter and a first three-way catalytic converter downstream from the particulate filter in a position close to the engine in an exhaust gas system connected to an outlet of the internal combustion engine and another three-way catalytic converter arranged in the underbody position of the motor vehicle, downstream from the first three-way catalytic converter. An exhaust gas burner is active from the start of the engine, introducing hot exhaust gas into the exhaust gas system downstream from the particulate filter, in order to heat at least one of the three-way catalytic converts to a light-off temperature, as quickly as possible after the cold start, thereby allowing an efficient exhaust gas aftertreatment. The exhaust gas burner can be switched off when at least one of the two three-way catalytic converters has reached its light-off temperature.

The invention relates to method for operating an internal combustion engine that has at least two combustion chambers, of which at least one is operated at a substoichiometric air-fuel ratio and of which at least another is operated at a superstoichiometric air-fuel ratio. The outlet of the internal combustion engine is connected to an exhaust gas system in which a three-way catalytic converter is arranged in the flow direction of an exhaust gas through an exhaust gas channel, and an exhaust gas heat-recovery device is arranged downstream from the three-way catalytic converter. It is provided for the unburned fuel components of the combustion chamber that is operated at a substoichiometric air-fuel ratio to be exothermally reacted with the residual oxygen from the combustion chamber that is operated at a superstoichiometric air-fuel ratio on the three-way catalytic converter, whereby the exhaust gas temperature is raised so that the exhaust gas heat-recovery device can recover a portion of the exhaust gas enthalpy downstream from the three-way catalytic converter.

Method for operating an internal combustion engine as well as internal combustion engine

The invention relates to a method for starting an internal combustion engine, the exhaust gas system of which is equipped with an electrically heatable lambda sensor and a catalytic converter with an oxygen reservoir. The combination of method steps according to the invention allows the internal combustion engine to be started with an optimal raw emission reduction directly after a cold start and an optimal pollutant conversion in the warm-up phase. The invention likewise relates to a motor vehicle with an internal combustion engine comprising an exhaust gas system having an electrically heatable lambda sensor and a catalytic converter with an oxygen reservoir, and comprising a controller, wherein the controller is designed to carry out the method according to the invention.

Method for commissioning an internal combustion engine, and motor vehicle comprising an internal combustion engine

The invention relates to an exhaust aftertreatment system for an internal combustion engine that, at its outlet, is connected to an exhaust gas system. In the exhaust gas system, a three-way catalytic converter close to the engine, an electrically heatable three-way catalytic converter downstream from the three-way catalytic converter close to the engine, and further downstream, a particulate filter or a four-way catalytic converter are situated in the flow direction of an exhaust gas of the internal combustion engine through an exhaust duct of the exhaust gas system. In addition, the exhaust aftertreatment system includes a secondary air system with a secondary air pump and a secondary air line, which opens into the exhaust duct at an introduction point downstream from the three-way catalytic converter close to the engine and upstream from the electrically heatable three-way catalytic converter. The invention further relates to a method for regenerating a particulate filter or the four-way catalytic converter by use of such an exhaust aftertreatment system.

Exhaust aftertreatment system and method for regenerating a particulate filter

The invention relates to a method for the exhaust-gas aftertreatment of an internal combustion engine (), and to an internal combustion engine () having an exhaust-gas aftertreatment device for carrying out a method of said type. The internal combustion engine () is supplied with fresh air by way of a compressor (), has an adjustable valve control means () for the inlet valves () and/or the outlet valves (), and is connected to an exhaust duct (), wherein, in the exhaust duct (), there is arranged a first three-way catalytic converter (), and an injection valve () for introducing fuel into the exhaust duct () is arranged, as viewed in the flow direction of an exhaust gas of the internal combustion engine (), downstream of an outlet () of the internal combustion engine () and upstream of the first three-way catalytic converter (). The method comprises the following steps:&#x2014;operating the internal combustion engine () in a scavenging mode,&#x2014;introducing a superstoichiometric exhaust gas into the exhaust duct (),&#x2014;metering fuel into the exhaust duct () upstream of the first three-way catalytic converter () such that a stoichiometric exhaust gas is realized at the inlet of the first three-way catalytic converter (), and&#x2014;performing aftertreatment of the stoichiometric exhaust gas by way of the first three-way catalytic converter ().

Method and device for the exhaust-gas aftertreatment of an internal combustion engine

An exhaust aftertreatment system for an internal combustion engine has an exhaust system having at least one three-way catalyst near the engine, wherein a particulate filter is arranged downstream from the three-way catalyst, preferably in an underbody installation in a motor vehicle. A heated catalyst, which has at least one heating stage that can be heated by means of an electric heating element, is provided upstream from the at least one three-way catalyst and downstream from the particulate filter. The at least one electrically heatable heating stage is supplied with electric power directly from a generator that is operatively connected to the internal combustion engine, so that heating of the heated catalyst takes place essentially independently of the charge status of the vehicle battery.

Growing community of inventors

Wolfsburg, Germany

Stefan Paukner