| 摘要 |
A method of optimising ammonia generation in an exhaust system (270, fig 1) of an internal combustion engine 100, the exhaust system comprising at least two after-treatment devices (280, fig 1), the after-treatment devices being at least a lean NOx trap 281 and a selective catalytic reduction system 282 or a selective catalytic reduction system comprising a particulate filter 283, the method comprising: predicting or measuring (20, fig 6) the present ammonia production from said lean NOx trap 281 during its regeneration phase under rich combustion conditions, comparing (21, fig 6) said present ammonia production with an optimal ammonia production needed by the selective catalytic reduction system 282, 283 and acting on at least one parameter, such as a target value air/fuel ratio and/or end criteria (23, fig 7) influencing said lean NOx trap regeneration phase, to reach the optimal ammonia production.
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