Method of operating a particle filter in the exhaust system of a motor vehicle's internal combustion engine
AssigneeDaimler AG
InventorsWalter Boegner, Andreas Hertzberg
Life of this patent
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Abstract
In a method of operating a particle filter in an exhaust system of a motor vehicle internal combustion engine, wherein the particle filter is reconditioned, in intervals, by a soot-burn-off procedure, the amount of noncombustible ashes also collected in the particle filter is reduced by heating the particle filter and supplying to the particle filter, together with the exhaust gas of the internal combustion engine, a reducing agent which reacts with the ash deposits so as to chemically convert the ash deposits such that at least non-metallic ash components are decomposed and carried out of the particle filter by the exhaust gas.
Claims8
A method of operating a particle filter (4) in an exhaust system of a motor vehicle internal combustion engine (1), wherein the particle filter (4), which collects soot particles and ashes, is re-conditioned, in intervals, by a soot-burn off procedure, but wherein, in addition to soot, also non-combustible ashes are deposited during operation of the internal combustion engine, said method comprising the steps of:
- reducing, in an ash reducing procedure (A), the mass of the ash deposits in the particle filter by heating the particle filter and supplying to the particle filter, together with the exhaust gas of the internal combustion engine (1), a reducing agent which reacts with the ash deposits so as to chemically convert the ash deposits such that at least non-metallic constituent parts of the ash deposits are carried out of the particle filter (4) by the exhaust gas.
Dependencies are inferred from the claim text.