Process and device for controlling a particulate filter
AssigneeInstitut Francais du Petrole
InventorsJean-Baptiste Dementhon, Brigitte Martin, Olivier Pajot
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for controlling a particulate filter in the exhaust of a Diesel engine using an after-treatment of the particulates while requiring a minimum amount of energy. The process according to the invention adapts the geometry of a filter placed in the exhaust gas flow according to predetermined strategies linked with the running of the engine, the process being such that it limits a mean back pressure of the engine which degrades engine efficiency.
Claims43
A process for controlling a particulate filter placed in an exhaust flow of an engine for performing an after-treatment of the particulates which requires a minimum amount of energy, comprising:
- changing a geometry of the filter placed in the exhaust gas flow as a function of predetermined strategies linked with running of the engine;
- and
- changing a volume of the filter in which the exhaust gases are filtered as a function of a volume flow rate of gases that enter the filter, the changing of volume being produced by filter zones of the filter juxtaposed in cross section through which the exhaust gas can flow in parallel simultaneously through more than one filter zone in a plane perpendicular to the exhaust gas flow by interacting with at least one exhaust gas flow deflection device which deviates the exhaust gas flow in at least one of the filter zones, to limit a mean back pressure which degrades engine efficiency.
A device for controlling regeneration of particulates likely to be deposited on a filter placed in an exhaust gas flow of an engine, comprising:
- at least two filtering zones dividing the filter, the zones being juxtaposed in cross section through which in parallel the exhaust gas can flow in a plane perpendicular to the exhaust gas flow;
- at least one throttling device associated with at least one of the filtering zones which can modulate simultaneously a distribution of the exhaust gas flow through the at least two filtering zones;
- at least one pressure detector placed in the exhaust gas flow upstream from the filter;
- at least one device which evaluates a flow rate of the exhaust gases to the filter;
- and
- a control which controls the at least one throttling device as a function of predetermined strategies linked with running of the engine and a volume flow rate of the exhaust gases.
Dependencies are inferred from the claim text.