METHOD FOR CONTROLLING THE REDUCTANT BUFFER LEVEL IN AN EXHAUST GAS AFTERTREATMENT DEVICE
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United States of America Patent
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Sep 17, 2015
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Dec 18, 2009
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Abstract
A method for controlling a reductant buffer level in an exhaust gas after treatment device connectable downstream of an internal combustion engine includes performing a first reductant injection of a first amount upstream the exhaust gas after treatment device, performing a second reductant injection of a second amount upstream the exhaust gas after treatment device, which second amount is different to the first amount, evaluating the NOx conversion resulting from the first and second reductant injections downstream the exhaust gas after treatment device to obtain a first and second result, controlling a further reductant injection in dependence of the first and second results from the first and second NOx conversion evaluations.
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