US 12,442,340 B2
Engine
Yuji Kawabata, Osaka (JP); Junichi Niimi, Osaka (JP); Katsunari Jonouchi, Osaka (JP); and Masahiro Itani, Osaka (JP)
Assigned to YANMAR HOLDINGS CO., LTD., Osaka (JP)
Filed by Yanmar Holdings Co., Ltd., Osaka (JP)
Filed on Nov. 1, 2023, as Appl. No. 18/386,140.
Claims priority of application No. 2022-175444 (JP), filed on Nov. 1, 2022.
Prior Publication US 2024/0141843 A1, May 2, 2024
Int. Cl. F02D 41/00 (2006.01)
CPC F02D 41/0052 (2013.01) [F02D 41/0077 (2013.01); F02D 2200/0614 (2013.01); F02D 2200/101 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An engine including an EGR device that recirculates part of exhaust gas discharged from a cylinder head as EGR gas to an intake pipe that supplies gas to the cylinder head, the EGR device including an EGR valve that adjusts a recirculation amount of the EGR gas, the engine comprising:
a control unit that controls the EGR valve, wherein:
the control unit selects a predetermined control mode from at least a first mode, a second mode, and a third mode according to an operation state of the engine, wherein the operation state includes at least an engine speed and a fuel injection amount, and controls the EGR valve in the selected control mode,
the first mode is a control mode in which the EGR valve is fully closed,
the second mode is a control mode in which an opening degree of the EGR valve is adjusted according to the operation state of the engine, and
the third mode is a control mode in which an ON period, in which the opening degree of the EGR valve is adjusted according to the operation state of the engine, and an OFF period, in which the EGR valve is fully closed, are repeatedly alternated.