CATALYST REGENERATION PROCESSING APPARATUS

摘要

A catalyst regeneration processing apparatus for an internal-combustion engine includes an electronic control unit. The electronic control unit is configured to determine whether a gap is equal to a predetermined degree or less, the gap being a difference between (a) a progress degree of heat deterioration of a NOx catalyst in a predetermined time in a case of assuming that a regeneration process is executed for the predetermined time and (b) a progress degree of heat deterioration of the NOx catalyst in the predetermined time in a case of assuming that the regeneration process is not executed. The electronic control unit is configured to execute the regeneration process in a case of determining that the gap is equal to the predetermined degree or less, even when a sulfur poisoning quantity does not exceed a permissible upper limit quantity.

主权项

1. A catalyst regeneration processing apparatus for an internal-combustion engine, the internal-combustion engine including a NOx catalyst that is disposed in an exhaust passage, the catalyst regeneration processing apparatus comprising:
an electronic control unit configured to
(i) calculate a sulfur poisoning quantity of the NOx catalyst,(ii) control the internal-combustion engine such that a regeneration process is executed, in a case where the sulfur poisoning quantity exceeds a permissible upper limit quantity, the regeneration process being a process of raising a temperature of the NOx catalyst so as to reduce the sulfur poisoning quantity,(iii) determine whether a gap is equal to a predetermined degree or less, the gap being a difference between (a) a progress degree of heat deterioration of the NOx catalyst in a predetermined time in a case of assuming that the regeneration process is executed for the predetermined time and (b) a progress degree of heat deterioration of the NOx catalyst in the predetermined time in a case of assuming that the regeneration process is not executed, and(iv) execute the regeneration process in a case of determining that the gap is equal to the predetermined degree or less, even when the sulfur poisoning quantity does not exceed the permissible upper limit quantity.