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New environmental legislation has created an engineering challenge for heavy-duty diesel engines. CO 2 and NO x emissions must fall below the stricter standards; at the same time, greater engine efficiency has resulted in a corresponding loss of exhaust gas temperature, leading to lower catalytic activity. This is particularly concerning when it comes to NO x emissions for cold start and low load cycles, as there is a lot of thermal inertia in the aftertreatment system. Integrating electric heaters into new designs might be the final piece of the puzzle in bringing diesel engines into compliance with the current laws - and an innovative way to make them more efficient as well. ...
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