# US 7,743,607 B2 · System for assisting regeneration of pollution management means in an engine exhaust line > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,743,607 B2 - Document ID: US7743607B2 - Status: Granted - Kind: B2 - Application number: 11/571,257 - Filed: 2005-06-21 - Published: 2008-01-24 - Granted: 2010-06-29 - Earliest claimed: 2004-06-23 - Assignees: Peugeot Citroen Automobiles SA - Inventors: Christophe Colignon - Web page: https://patentgrep.com/patent/US7743607B2 ## CPC - B01D 53/9495: {Controlling the catalytic process} - F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles - F01N 3/035: with catalytic reactors - F01N 3/0821: {combined with particulate filter} - F01N 3/0842: {Nitrogen oxides} - F01N 9/002: {of filter regeneration} - F01N 13/009: {having two or more separate purifying devices arranged in series} - F02D 41/029: {the exhaust gas treating apparatus being a particulate filter} - F02D 41/1474: {by detecting the commutation time of the sensor} - F02D 41/402: {Multiple injections} - F01N 2430/04: by adding non-fuel substances to combustion air or fuel, e.g. additives - F01N 2430/06: by varying fuel-air ratio, e.g. by enriching fuel-air mixture - F01N 2510/065: for reducing soot ignition temperature - F01N 2550/04: Filtering activity of particulate filters - F01N 2570/16: Oxygen - F02B 37/00: Engines characterised by provision of pumps driven at least for part of the time by exhaust - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - Y02T 10/40: Engine management systems - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract The invention concerns a system for assisting regeneration of pollution management means (1) associated with oxidation catalyst forming means (2) implementing an oxygen storage capacity (OSC) function, and integrated in an exhaust line of a motor vehicle diesel engine (4), wherein the engine is associated with common ramp means (7) supplying fuel to the cylinders thereof. The invention is characterized in that it comprises means (8) for determining the frequency of the pollution management means regeneration and for comparing same to predetermined threshold values (10), to control the engine (4) in a first lean mixture regeneration operating mode (11) for frequencies less than the threshold values or in a second regeneration operating mode implementing engine operating sequences alternating rich mixture and lean mixture operating phases (12) for frequencies more than the threshold values. ## Claims ### Claim 1 System for assisting the regeneration of depollution means associated with means forming oxidation catalyst implementing an OSC function, constituting an oxygen reserve and integrated in an exhaust line of a motor vehicle diesel engine, in which the engine is associated with these common rail means for the supply of fuel to the cylinders thereof, wherein said system comprises: means for determining the frequency of attempts at regeneration and activations of requests for regeneration of the depollution means and for comparing this frequency to predetermined threshold values, wherein the engine is driven in (i) a first regeneration operation mode with lean mixture for the frequencies lower than the threshold values and in (ii) a second regeneration operation mode implementing sequences of operation of the engine alternating operation phases with rich mixture and with lean mixture for the frequencies higher than the threshold values. ### Claim 2 (depends on 1) System according to claim 1, wherein the depollution means comprise a particle filter. ### Claim 3 (depends on 2) System according to claim 2, wherein the particle filter is catalyzed. ### Claim 4 (depends on 1) System according to claim 1, wherein the depollution means comprise a NOx trap. ### Claim 5 (depends on 1) System according to claim 1, wherein the fuel comprises an additive intended to be deposited, with the particles with which it is mixed, on the depollution means to facilitate their regeneration. ### Claim 6 (depends on 1) System according to claim 1, wherein the fuel comprises an additive forming NOx trap. ### Claim 7 (depends on 1) System according to claim 1, wherein the depollution means are impregnated with an SCR formulation, ensuring a CO/HC oxidation function. ### Claim 8 (depends on 1) System according to claim 1, wherein the engine is associated with a turbo-compressor. ### Claim 9 (depends on 1) System according to claim 1, wherein the regeneration frequency of the depollution means is determined from the five last regeneration attempts thereof. ### Claim 10 (depends on 1) System according to claim 1, wherein the regeneration frequency is calculated based on an average distance traveled by the vehicle between two regenerations. ### Claim 11 Method for assisting the regeneration of depollution means associated with means forming oxidation catalyst implementing an OSC function, constituting an oxygen reserve and integrated in an exhaust line of a motor vehicle diesel engine, in which the engine is associated with these common rail means for the supply of fuel to the cylinders thereof, said method further comprising: determining the frequency of attempts at regeneration and activations of requests for regeneration of the depollution means, comparing this frequency to predetermined threshold values, and driving the engine in (i) a first regeneration operation mode with lean mixture for the frequencies lower than the threshold values and in (ii) a second regeneration operation mode implementing sequences of operation of the engine alternating operation phases with rich mixture and with lean mixture for the frequencies higher than the threshold values. ### Claim 12 (depends on 11) Method according to claim 11, wherein the depollution means comprise a particle filter. ### Claim 13 (depends on 12) Method according to claim 12, wherein the particle filter is catalyzed. ### Claim 14 (depends on 11) Method according to claim 11, wherein the depollution means comprise a NOx trap. ### Claim 15 (depends on 11) Method according to claim 11, wherein the fuel comprises an additive intended to be deposited, with the particles with which it is mixed, on the depollution means to facilitate their regeneration. ### Claim 16 (depends on 11) Method according to claim 11, wherein the fuel comprises an additive forming NOx trap. ### Claim 17 (depends on 11) Method according to claim 11, wherein the depollution means are impregnated with an SCR formulation, ensuring a CO/HC oxidation function. ### Claim 18 (depends on 11) Method according to claim 11, wherein the engine is associated with a turbo-compressor. ### Claim 19 (depends on 11) Method according to claim 11, wherein the regeneration frequency of the depollution means is determined from the five last regeneration attempts thereof. ### Claim 20 (depends on 11) Method according to claim 11, wherein the regeneration frequency is calculated based on an average distance traveled by the vehicle between two regenerations.