Method for operating a NOx storage catalyst

摘要

The catalyst is part of an IC engine. It is brought to desulphurization temperature to carry out a desulphurization process to remove catalyst deactivation. The process consists of several stages. The need for desulphurization is established, energy required for this process is calculated, and a release signal to initiate the process is issued, dependent upon vehicle traveling condition. When a preset ratio of need and energy expenditure, and a release signal are present, an engine operating parameter is changed so that the heat input into the catalyst is increased, and the desulphurization temperature in the catalyst is achieved or maintained.