US 12,404,795 B2
Treatment device, treatment method, and exhaust gas treatment system
Yoshitoshi Nagado, Tokyo (JP); and Akira Ito, Tokyo (JP)
Assigned to KOMATSU LTD., Tokyo (JP)
Appl. No. 18/727,721
Filed by Komatsu Ltd., Tokyo (JP)
PCT Filed Nov. 8, 2022, PCT No. PCT/JP2022/041541
§ 371(c)(1), (2) Date Jul. 10, 2024,
PCT Pub. No. WO2023/139890, PCT Pub. Date Jul. 27, 2023.
Claims priority of application No. 2022-007744 (JP), filed on Jan. 21, 2022.
Prior Publication US 2025/0092811 A1, Mar. 20, 2025
Int. Cl. F01N 11/00 (2006.01); F01N 9/00 (2006.01)
CPC F01N 11/00 (2013.01) [F01N 9/002 (2013.01); F01N 2550/04 (2013.01); F01N 2900/0421 (2013.01); F01N 2900/0422 (2013.01); F01N 2900/1606 (2013.01); F01N 2900/1611 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A treatment device comprising:
a computer, the computer being configured to:
acquire 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;
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.