Treatment device, treatment method, and exhaust gas treatment system

A treatment method comprising:

• a step of acquiring information indicating an estimated value of a deposition amount of ash deposited on a filter that collects a particulate matter in an exhaust gas of an engine, and information indicating an atmospheric pressure;
• a step of calculating an allowable ash deposition amount threshold value corresponding to an allowable ash deposition amount that changes according to the atmospheric pressure;
• a step of determining that the filter needs to be cleaned in a case where the estimated value is greater than or equal to the allowable ash deposition amount threshold value;
• a step of acquiring regeneration information, which is information related to a regeneration interval of the filter and a regeneration operation of heating the filter to increase a temperature of the filter and burning and removing particulate matter deposited on the filter;
• and
• a step of issuing a notification that the filter needs to be cleaned in a case where it is determined that the filter needs to be cleaned,
• whereby feedback control of a diesel oxidation catalyst outlet temperature is performed by control of a fuel post-injection of the engine and/or control of the amount of a hydrocarbon dosing with fuel such that the diesel oxidation catalyst outlet temperature matches a predetermined regeneration target temperature to carry out the regeneration operation.

An exhaust gas treatment system comprising:

• a filter configured to collect a particulate matter in an exhaust gas of an engine;
• and
• a computer, the computer being configured to:
• acquire information indicating an estimated value of a deposition amount of ash deposited on the filter, and information indicating an atmospheric pressure;
• calculate an allowable ash deposition amount threshold value corresponding to an allowable ash deposition amount that changes according to the atmospheric pressure;
• determine that the filter needs to be cleaned in a case where the estimated value is greater than or equal to the allowable ash deposition amount threshold value;
• acquire regeneration information, which is information related to a regeneration interval of the filter and a regeneration operation of heating the filter to increase a temperature of the filter and burning and removing particulate matter deposited on the filter;
• and
• issue a notification that the filter needs to be cleaned in a case where it is determined that the filter needs to be cleaned,
• whereby feedback control of a diesel oxidation catalyst outlet temperature is performed by control of a fuel post-injection of the engine and/or control of the amount of a hydrocarbon dosing with fuel such that the diesel oxidation catalyst outlet temperature matches a predetermined regeneration target temperature to carry out the regeneration operation.