Catalytic nitrogen oxide trap`s heat ageing estimating method for internal combustion engine, involves determining ageing factor represented by sum of numbers of time units passed in grades of temperature by severity factors of grades

摘要

The method involves evaluating an effect of a rise in temperature of a reference trap by grades of temperature. A number of time units passed by the trap in the grades is determined for the trap during utilization. An ageing factor represented by a sum of products is determined for the trap, where each product is the number of time units passed by the trap in one of the grades by severity factors determined for each grade. An independent claim is also included for utilization of a method for managing regeneration phases of a catalytic nitrogen oxide trap.