Abstract: A method for determining the charge state of a particle filter installed in the exhaust gas line of an internal combustion engine comprises the following steps: determining the exhaust gas volumetric flow in the flow direction of the exhaust gas downstream of the particle filter (2), detecting the pressure present in the exhaust gas line (1) in the direction of flow of the exhaust gas prior to the particle filter (2), comparing the exhaust gas volumetric flow determined hinter the particle filter (2) with the detected pressure present upstream of the particle filter (2) and evaluating the results of the comparison with consideration to the exhaust gas back pressure of the uncharged particle filter (2) and the exhaust gas back pressure caused by the particle filter charge, said pressure being higher than the uncharged filter. Further described is a corresponding device for reducing the particle emissions of an internal combustion engine.
Abstract: A system for NOx reduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO2, a particulate filter, a source of reductant such as NH3 and an SCR catalyst. Considerable improvements in NOx conversion are observed.
Type:
Grant
Filed:
July 8, 2004
Date of Patent:
March 3, 2009
Assignees:
Johnson Matthey Public Limited Company, Daimler AG, HJS Fahrzeugtechnik GmbH & Co KG
Inventors:
Anders Andreasson, Guy Richard Chandler, Claus Friedrich Goersmann, James Patrick Warren, Georg Huethwohl
Abstract: A method of controlling the energization of a heating device for the regeneration of a particle filter disposed in the exhaust duct of an internal combustion engine, particularly a Diesel engine, wherein a measure for the soot charge state of the particle filter the exhaust gas back pressure is determined while the engine is preferably idling, the exhaust gas recirculation is switched off, and predetermined conditions are present in the exhaust gas duct upstream of the particle filter, and then an exhaust gas back pressure signal is compared with a threshold value indicating a soot charge sufficient for the initiation of a regeneration of the particle filter and the heating device is enabled for the initiation of the regeneration procedure if the exhaust gas back pressure signal is greater than the threshold value.
Type:
Grant
Filed:
June 21, 2005
Date of Patent:
July 31, 2007
Assignee:
HJS Fahrzeugtechnik GmbH & Co. KG
Inventors:
Hermann-Josef Schulte, Hans-Peter Frisse, Arno Schindler, Klaus Schrewe
Abstract: The invention relates to an exhaust gas particulate filter made of sintered metal for removing particulates contained in the exhaust gas stream of an internal combustion engine, particularly of a diesel internal combustion engine. The exhaust gas particulate filter is made of a filter material having at least one metal support (1), which has openings (O). The openings (O) are bounded by segments (S), which are tilted in respect to the outer surface planes of the support (1). The openings (O) are filled with sinter metal powder The support (1) consists of an expanded metal, and the sections delimitating the openings (O) of the support (1) are joined to one anther with a material bond forming nodes (K). The sintered metal powder filling of the openings (O) is arranged in a substantially flush manner with the outside surfaces of the support (1).
Type:
Application
Filed:
January 26, 2007
Publication date:
July 5, 2007
Applicants:
HJS FAHRZEUGTECHNIK GMBH CO KG, PUREM ABGASSYSTEME GMBH. CO. KG
Abstract: Selective catalytic reduction of NOx in combustion gases, especially from diesel engines, utilizes a system incorporating an oxidation catalyst to convert at least a portion of NO to NO2, a particulate filter downstream of the oxidation catalyst, a source of reductant such as NH3 or urea for injection downstream of the particulate filter, and an SCR catalyst located downstream of the point of injection of the reductant. Considerable improvements in NOx conversion are observed.
Type:
Grant
Filed:
January 9, 2001
Date of Patent:
October 19, 2004
Assignees:
Johnson Matthey Public Limited Company, HJS Fahrzeugtechnik GmbH & Co. KG
Inventors:
Anders Andreasson, Guy Richard Chandler, Claus Friedrich Goersmann, James Patrick Warren