Patent ID: 7328573
Filing Date: 2008-02-12
Classification: F01N,F02B

Abstract:
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.