| 摘要 |
The operating modes of the engine are controlled by temporary influence of at least one operating parameter of the engine, catalyst or real or expected emissions. When the NOx storage catalyst is full, it is decided whether catalyst regeneration is required depending on whether a change in operating mode change will increase NOx desorption or cause a NOx escape Process for controlling the operation of an internal combustion engine (10) with a NOx storage catalyst (18) downstream of the engine in an exhaust pipe (14). Another change in the mode of operation of the engine is authorised as a function of the parameters of the engine, catalyst and real or expected emissions, and a final verification to see if a change in the mode of operation of the engine is possible. This change is not authorised until a minimum time (tmin) has passed and/or a preset minimum modification of at least one operating parameter has occurred. A NOx threshold value is determined for the state of the NOx catalyst being full. The second (other) engine parameters are chosen from: current catalyst temperature, current use of the engine, current speed of the vehicle, speed of the vehicle currently used, current position of the accelerator pedal, NOx emissions transmitted during the previous phase and previous number of poor-homogenous mixture changes without initiating final regeneration, with or without taking into account the NOx output from the catalyst. The parameters used in addition to or instead of the minimum time are chosen from: preset minimum modification of the engine regime since the last check, minimum modification of the couple delivered by the engine, modification of the desired operating system, or preset minimum modification of the temperature of the exhaust gas purification system.
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