US 11,754,016 B2
Fuel injection control device and fuel injection control method for internal combustion engine
Kazuya Saito, Hitachinaka (JP); and Hiroshi Miyamoto, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 17/908,267
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Mar. 9, 2021, PCT No. PCT/JP2021/009260
§ 371(c)(1), (2) Date Aug. 31, 2022,
PCT Pub. No. WO2021/187234, PCT Pub. Date Sep. 23, 2021.
Claims priority of application No. 2020-045102 (JP), filed on Mar. 16, 2020.
Prior Publication US 2023/0119411 A1, Apr. 20, 2023
Int. Cl. F02D 41/40 (2006.01); F02D 41/00 (2006.01); F02D 41/38 (2006.01)
CPC F02D 41/402 (2013.01) [F02D 41/008 (2013.01); F02D 2041/389 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A fuel injection control device for an internal combustion engine having a plurality of cylinders and a fuel injection valve provided for each cylinder,
the fuel injection control device comprises:
a basic pulse width setting unit that determines a basic pulse width of a drive pulse signal to be output to the fuel injection valves based on an operation state of the internal combustion engine,
a pulse width correcting unit that corrects the basic pulse width by a cylinder-specific correction value that is based on injection variations among the fuel injection valves and sets a cylinder-specific pulse width,
a split number setting unit that sets a split number of split injection, the split number setting unit being configured to determine whether or not the split number is acceptable based on a pulse width per one injection calculated from the cylinder-specific pulse width and the split number and on a minimum pulse width that is a lower limit of a pulse width of the drive pulse signal, to modify the split number based on a result of the acceptance determination, and to modify an acceptance determination reference value which is used in the acceptance determination based on the correction value for each cylinder, and
a split injection controlling unit that executes split injection based on the split number, the basic pulse width, and the correction value for each cylinder.