METHODS OF REGENERATING A NOX ABSORBENT

摘要

An exhaust system (40) for a lean-burn internal combustion engine (12) comprising at least one NOX-absorbent disposed on a unitary monolith substrate (42), means (20) comprising an injector for injecting droplets of a liquid reductant into exhaust gas upstream of the at least one substrate and means, when in use, for controlling the injection of reluctant in order to regenerate the NOX absorbent thereby to meet a relevant emission standard, the arrangement being such that droplets of the liquid reluctant contact the NOX absorbent thereby causing localised reduction of NOX.