Process and device intended for nitrogen oxides elimination in an exhaust line of an internal-combustion engine
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United States of America Patent
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Jan 21, 2003
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N/A
app pub date -
Dec 9, 1999
filing date -
Dec 9, 1998
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Abstract
A device for eliminating nitrogen oxides in an exhaust line of a lean-burn internal-combustion engine (1) a NO.sub.x trap (3) for trapping the nitrogen oxides, a system for regenerating the nitrogen oxides when the NO.sub.x trap is saturated, a hydrocarbon treating catalyst (2) placed upstream from the NO.sub.x trap (3), a hydrocarbon injector (4) placed upstream from hydrocarbon treating catalyst (2), a probe (7) for measuring the gas mixture strength. The hydrocarbon treating catalyst (2) is a partial (or controlled) hydrocarbon oxidation catalyst that cooperates with the NO.sub.x trap (3) for trapping the nitrogen oxides and that allows to obtain, at the outlet thereof, gases with a low oxygen (O.sub.2) concentration and with high carbon monoxide (CO) and hydrogen (H.sub.2) concentrations. A control unit is furthermore provided for recording and processing data coming from various detectors and/or stored in order to carry out effective regeneration of the NO.sub.x trap (3) without disrupting the smooth running of the engine.
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