Ford Global Technolgoies, LLC

Volvo Personvagnar Ab

Roger Tengblad

Filip Acke

Hans Bernler

Magnus Blomroos

Gisela Blomkvist

Jan-Erik Larsson

G&ouml;ran Wirmark

Maria Karlsson

S&ouml;ren Karlsson

The invention relates to a method for purifying exhaust gas in an internal combustion engine provided with an LNT and a particulate matter filter arranged in an exhaust gas conduit of the engine. The method includes de-sulfurization of the LNT and regeneration of the particulate matter filter. The invention includes the following steps: initiating a heating phase wherein the engine is set to generate heat sufficient for the de-sulfurization and the regeneration; initiating a de-sulfurization phase during a first time period (t), in which the engine is set to generate a rich exhaust gas in the exhaust gas conduit; keeping the first time period below a first maximum value so as to avoid release of emissions of HS from the engine; initiating a regeneration phase during a second time period, in which the engine is set to generate a lean exhaust gas in the exhaust gas conduit; keeping the second time period below a second maximum value so as to avoid thermal damage to the particulate matter filter; and repeating the de-sulfurization phase and the regeneration phase in a periodical manner.

Method and arrangement for purifying exhaust gas in an internal combustion engine

The invention refers to a method and apparatus for converting NOand comprises the step of controlling a temperature in a NO-LNT by adsorbing NOin the LNT at a temperature below a predetermined temperature value to a predetermined value being the maximum amount of NOto be stored at the predetermined temperature value, thereafter heating the LNT to the predetermined temperature value, and thereafter starting a regeneration process by addition of reducing agents.

[object Object]

The invention relates to a device and a method for reducing emissions in catalytic converter exhaust systems for a vehicle provided with a combustion engine. The invention comprises a control unit adapted to control the air-fuel being fed to the engine so that a high concentration of hydrogen is generated in the exhaust gas during start-up of the engine. Furthermore, secondary air is supplied downstream of the engine during cold starting thereof for foaming a gas mixture with the exhaust gas. This gas mixture is oxidized, so that heat energy generated by means of this oxidation is supplied to the catalyst, thereby providing a reduction of the light-off time of the catalyst.

Device and method for reducing emissions in catalytic converter exhaust systems

Growing community of inventors

Göteborg, Sweden

Roger Tengblad