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. |
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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 |
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.
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