US 7,320,215 B2
System for providing assistance in regenerating depollution means integrated in a vehicle exhaust line
Christophe Colignon, Levallois Perret (France)
Assigned to Peugeot Ciitroen Automobiles SA, Velizy-Villacoublay (France)
Appl. No. 10/595,632
PCT Filed Oct. 12, 2004, PCT No. PCT/FR2004/002588
§ 371(c)(1), (2), (4) Date May 01, 2006,
PCT Pub. No. WO2005/047676, PCT Pub. Date May 26, 2005.
Claims priority of application No. 03 13159 (FR), filed on Nov. 07, 2003.
Prior Publication US 2007/0107418 A1, May 17, 2007
Int. Cl. F01N 3/00 (2006.01)
U.S. Cl. 60—295  [60/285; 60/286; 60/297] 11 Claims
OG exemplary drawing
 
1. A system for assisting the regeneration of depollution means associated with oxidation catalyst-forming means integrated in an exhaust line of a motor vehicle diesel engine, and in which the engine is associated with common manifold means for feeding fuel to its cylinders, the system being adapted to implement, at constant torque, a strategy of regeneration by injecting fuel into the cylinders of the engine in at least one post-injection, wherein the system includes detection means for detecting at least one of a stage in which the vehicle engine is idling, a stage in which the accelerator pedal is being raised, and a stage in which the vehicle engine is idling and the accelerator pedal is being raised, and analysis means for analyzing the activity state of the catalyst-forming means in order to control the common fuel-feed manifold means in order to regulate the quantity of fuel injected during the or each post-injection as a function of the activity state of the catalyst-forming means;
wherein the analysis means for analyzing the activity state of the catalyst-forming means are connected to temperature sensors upstream and downstream from the catalyst-forming means in order to determine an operating point thereof and including determination means responsive to said operating point for determining the activity state of the catalyst-forming means; and
wherein the determination means for determining the activity state of the catalyst-forming means are adapted to compare the operating point of said means with two predetermined activity state transition curves defining ranges for an inactive state, an active state, and an activity-confirmed state of the catalyst-forming means and for confirming a state after a first predetermined period of time for confirming that the catalyst-forming means are in said state,
wherein, when the catalyst-forming means are in an activity-confirmed state, the common manifold means are adapted to inject a nominal quantity of fuel during the or each post-injection, when the catalyst-forming means are in an active state, the common manifold means are adapted to reduce the quantity of fuel injected during the or each post-injection by a multiplier factor, as a function of the difference between the operating point of said catalyst-forming means and the corresponding transition curve between an active state and an inactive state, and when the catalyst-forming means are in an inactive state, the common manifold means are adapted to limit the quantity of fuel injected during the or each post-injection to a predetermined minimum value.