US 12,435,652 B2
Exhaust gas purification control device
Tomohiro Ueno, Kariya (JP); and Eiji Takemoto, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Jan. 12, 2024, as Appl. No. 18/411,387.
Claims priority of application No. 2023-004725 (JP), filed on Jan. 16, 2023.
Prior Publication US 2024/0240579 A1, Jul. 18, 2024
Int. Cl. F01N 3/20 (2006.01); F01N 11/00 (2006.01); F01N 13/00 (2010.01)
CPC F01N 3/2066 (2013.01) [F01N 11/00 (2013.01); F01N 13/009 (2014.06); F01N 13/011 (2014.06); F01N 2550/05 (2013.01); F01N 2610/02 (2013.01); F01N 2610/144 (2013.01); F01N 2610/1453 (2013.01); F01N 2900/0414 (2013.01); F01N 2900/0418 (2013.01); F01N 2900/1806 (2013.01); F01N 2900/1808 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An exhaust gas purification controller applied to an exhaust gas purification system including a catalyst of a selective reduction type provided in an exhaust passage of an internal combustion engine, a supply valve provided to supply urea water to an upstream part of the catalyst in the exhaust passage, and a pump for pumping the urea water to a supply passage connecting a urea water tank for storing the urea water with the supply valve, the exhaust gas purification controller for performing an abnormality diagnosis of the supply valve, the exhaust gas purification controller configured to:
drive the pump at a start of operation of the exhaust gas purification system to start filling the supply passage with the urea water;
output a valve opening command for opening the supply valve when a urea water pressure in the supply passage exceeds a predetermined valve opening pressure after filling the supply passage with the urea water is started;
determine presence or absence of a sticking abnormality of the supply valve based on the urea water pressure after the output of the valve opening command; and
determine that the sticking abnormality of the supply valve has occurred when an increase amount of the urea water pressure during a predetermined period from the output of the valve opening command is larger than a predetermined threshold.