US 12,071,879 B2
NOx generation amount control device
Daiki Ishii, Fujisawa (JP); Takao Onodera, Fujisawa (JP); Yoshifumi Hanamura, Fujisawa (JP); Kazushige Yamaura, Fujisawa (JP); Satoshi Hanawa, Fujisawa (JP); and Hotaka Saitou, Fujisawa (JP)
Assigned to ISUZU MOTORS LIMITED, Tokyo (JP)
Filed by ISUZU MOTORS LIMITED, Tokyo (JP)
Filed on Aug. 22, 2023, as Appl. No. 18/453,492.
Claims priority of application No. 2022-144525 (JP), filed on Sep. 12, 2022.
Prior Publication US 2024/0084725 A1, Mar. 14, 2024
Int. Cl. F01N 11/00 (2006.01)
CPC F01N 11/007 (2013.01) [F01N 2550/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A NOx generation amount control device comprising:
an exhaust amount calculating part that calculates a NOx exhaust amount based on a NOx concentration detected at a downstream side of a purification apparatus provided in an exhaust passage in which exhaust gas of an engine flows, and on an exhaust amount of the engine, at each prescribed time interval;
a cumulative amount calculating part that calculates a cumulative NOx amount obtained by adding together a plurality of NOx exhaust amounts;
a specifying part that specifies a target value for the cumulative NOx amount associated with a movement distance of a moving body including the engine or an output value of the engine;
an estimating part that estimates a predicted NOx amount indicating a predicted cumulative NOx amount at a prescribed timing or at a prescribed travel distance based on a rotation speed of the engine and a fuel injection amount;
a judging part that judges whether a sum of the predicted NOx amount and the cumulative NOx amount exceeds a target value; and
a determining part that determines a scheduled NOx exhaust amount for each prescribed time interval based on a judgment result of the judging part, an upper limit value of NOx exhaust, and a difference between the target value and the cumulative NOx amount, and determines at least one of an opening degree of a valve provided in a passage for recirculating the exhaust gas to the engine and an opening degree of a turbocharger, corresponding to the scheduled NOx exhaust amount.