초록 ▼

A system for assisting regeneration of a particle filter of an exhaust line (3) of a diesel engine associated with, in particular: a particle filter (7); an oxidation catalytic converter (6); a common system (8) for feeding fuel to the cylinders of the engine; means (16) for adding to the fuel an

A system for assisting regeneration of a particle filter of an exhaust line (3) of a diesel engine associated with, in particular: a particle filter (7); an oxidation catalytic converter (6); a common system (8) for feeding fuel to the cylinders of the engine; means (16) for adding to the fuel an additive adapted to reduce the combustion temperature of the trapped particles and propagate their combustion; and monitoring means (17) for triggering a phase of regeneration of the particle filter by combustion of the particles trapped therein during a phase of multiple injections of fuel; characterized in that the particle filter (7) is impregnated with a catalyst for oxidizing the hydrocarbons and CO present in the exhaust gases flowing through said particle filter.

대표청구항 ▼

The invention claimed is: 1. A system for assisting regeneration of a particle filter integrated in an exhaust line of a motor vehicle diesel engine, the engine being associated with various units, including: means for admitting air into the engine; means for recycling exhaust gases from the engine

The invention claimed is: 1. A system for assisting regeneration of a particle filter integrated in an exhaust line of a motor vehicle diesel engine, the engine being associated with various units, including: means for admitting air into the engine; means for recycling exhaust gases from the engine to the inlet thereof; a turbocompressor; a particle filter including a filter medium adapted to trap particles of soot present in the exhaust gases of said engine; an oxidation catalytic converter on the upstream side of the particle filter in the exhaust line or combined therewith; a common system for feeding fuel to the cylinders of the engine, including electrical fuel injectors associated with those cylinders; means for adding to the fuel an additive adapted to be deposited in the bed of soot particles to reduce the combustion temperature of particles trapped in the particle filter and to propagate their combustion; means for acquiring information relating to various operating parameters of the engine and the units associated therewith; means for monitoring the operation of at least one of the air admission means, the recycling means, the turbocompressor and the fuel feeding system in order to monitor the operation of the engine, these means being further adapted to trigger a phase of regenerating the particle filter by combustion of the particles trapped therein by triggering a phase of multiple injections of fuel into the cylinders of the engine during their expansion phase; wherein said filter medium of said particle filter is at least one of (i) coated and (ii) impregnated with a material capable of constituting a reserve of oxygen adapted to propagate the combustion of the soot during an operation of regenerating the particle filter, and wherein the distribution of the various materials in the filter is non uniform and the terminal portion of the downstream region of the filter contains no material constituting a reserve of oxygen and no catalyst. 2. A system according to claim 1, wherein said material is cerium oxide. 3. A system according to claim 1, wherein said material is a mixed oxide of cerium and zirconium. 4. A system according to claim 1, wherein the material capable of constituting a reserve of oxygen is preferentially disposed in the downstream region of the inlet passages of the filter. 5. A system according to claim 1, wherein the material constituting a reserve of oxygen is preferentially disposed in the peripheral region of the cross-section of the filter. 6. A system according to claim 1, wherein the particle filter is also at least one of (i) coated and (ii) impregnated with a catalyst encouraging the triggering of reactions tending to reduce the pollutant emissions of the engine. 7. A system according to claim 6, wherein the particle filter is also at least one of (i) coated and (ii) impregnated with a catalyst encouraging the triggering of combustion of the soot. 8. A system according to claim 7, wherein the distribution of the various materials in the filter is non-uniform, and wherein the catalyst encouraging the triggering of the combustion of the soot is preferentially disposed in the upstream region of the inlet passages of the filter. 9. A system according to claim 7, wherein the distribution of the various materials in the filter is non-uniform, and wherein the catalyst encouraging the triggering of the combustion of the soot is preferentially disposed in the central region of the cross-section of the filter. 10. A system according to claim 6, wherein said catalyst is selected from (i) metals from group VIII and (ii) mixtures of metals from group VIII. 11. A system according to claim 10, wherein the catalyst is selected from platinum, palladium, rhodium, and mixtures of said metals. 12. A system for assisting regeneration of a particle filter integrated in an exhaust line of a motor vehicle diesel engine, the engine being associated with various units, including: means for admitting air into the engine; means for recycling exhaust gases from the engine to the inlet thereof; a turbocompressor; a particle filter including a filter medium adapted to trap particles of soot present in the exhaust gases of said engine; an oxidation catalytic converter on the upstream side of the particle filter in the exhaust line or combined therewith; a common system for feeding fuel to the cylinders of the engine, including electrical fuel injectors associated with those cylinders; means for adding to the fuel an additive adapted to be deposited in the bed of soot particles to reduce the combustion temperature of particles trapped in the particle filter and to propagate their combustion; means for acquiring information relating to various operating parameters of the engine and the units associated therewith; means for monitoring the operation of at least one of the air admission means, the recycling means, the turbocompressor and the fuel feeding system in order to monitor the operation of the engine, these means being further adapted to trigger a phase of regenerating the particle filter by combustion of the particles trapped therein by triggering a phase of multiple injections of fuel into the cylinders of the engine during their expansion phase; wherein said filter medium of said particle filter is at least one of (i) coated and (ii) impregnated with a material capable of constituting a reserve of oxygen adapted to propagate the combustion of the soot during an operation of regenerating the particle filter, and wherein the distribution of the various materials in the filter is non uniform and the material constituting a reserve of oxygen is preferentially disposed in the peripheral region of the cross-section of the filter. 13. A system according to claim 12, wherein said material is cerium oxide. 14. A system according to claim 12, wherein said material is a mixed oxide of cerium and zirconium. 15. A system according to claim 12, wherein the material capable of constituting a reserve of oxygen is preferentially disposed in the downstream region of the inlet passages of the filter. 16. A system according to claim 12, wherein the particle filter is also at least one of (i) coated and (ii) impregnated with a catalyst encouraging the triggering of reactions tending to reduce the pollutant emissions of the engine. 17. A system according to claim 16, wherein the particle filter is also at least one of (i) coated and (ii) impregnated with a catalyst encouraging the triggering of combustion of the soot. 18. A system according to claim 17, wherein the distribution of the various materials in the filter is non-uniform, and wherein the catalyst encouraging the triggering of the combustion of the soot is preferentially disposed in the upstream region of the inlet passages of the filter. 19. A system according to claim 16, wherein said catalyst is selected from (i) metals from group VIII and (ii) mixtures of metals from group VIII. 20. A system according to claim 19, wherein the catalyst is selected from platinum, palladium, rhodium, and mixtures of said metals. 21. A system for assisting regeneration of a particle filter integrated in an exhaust line of a motor vehicle diesel engine, the engine being associated with various units, including: means for admitting air into the engine; means for recycling exhaust gases from the engine to the inlet thereof; a turbocompressor; a particle filter including a filter medium adapted to trap particles of soot present in the exhaust gases of said engine; an oxidation catalytic converter on the upstream side of the particle filter in the exhaust line or combined therewith; a common system for feeding fuel to the cylinders of the engine, including electrical fuel injectors associated with those cylinders; means for adding to the fuel an additive adapted to be deposited in the bed of soot particles to reduce the combustion temperature of particles trapped in the particle filter and to propagate their combustion; means for acquiring information relating to various operating parameters of the engine and the units associated therewith; means for monitoring the operation of at least one of the air admission means, the recycling means, the turbocompressor and the fuel feeding system in order to monitor the operation of the engine, these means being further adapted to trigger a phase of regenerating the particle filter by combustion of the particles trapped therein by triggering a phase of multiple injections of fuel into the cylinders of the engine during their expansion phase; wherein said filter medium of said particle filter is at least one of (i) coated and (ii) impregnated with a material capable of constituting a reserve of oxygen adapted to propagate the combustion of the soot during an operation of regenerating the particle filter, wherein the particle filter is also at least one of (i) coated and (ii) impregnated with a catalyst encouraging the triggering of reactions tending to reduce the pollutant emissions of the engine, wherein the particle filter is also at least one of (i) coated and (ii) impregnated with a catalyst encouraging the triggering of combustion of the soot, and wherein the distribution of the various materials in the filter is non-uniform, and the catalyst encouraging the triggering of the combustion of the soot is preferentially disposed in the central region of the cross-section of the filter. 22. A system according to claim 21, wherein said material is cerium oxide. 23. A system according to claim 21, wherein said material is a mixed oxide of cerium and zirconium. 24. A system according to claim 21, wherein the material capable of constituting a reserve of oxygen is preferentially disposed in the downstream region of the inlet passages of the filter. 25. A system according to claim 21, wherein the distribution of the various materials in the filter is non-uniform, and wherein the catalyst encouraging the triggering of the combustion of the soot is preferentially disposed in the upstream region of the inlet passages of the filter. 26. A system according to claim 21, wherein said catalyst is selected from (i) metals from group VIII and (ii) mixtures of metals from group VIII. 27. A system according to claim 26, wherein the catalyst is selected from platinum, palladium, rhodium, and mixtures of said metals.