公开(公告)号：US20250020088A1

公开(公告)日：2025-01-16

申请号：US18717543

申请日：2022-08-29

Applicant: KUBOTA CORPORATION

Inventor： Yasushi KOBAYASHI ,  Naotaro NAGAI ,  Rina KANEKO ,  Masanari TENNOMI ,  Naruhiro MATSUO

IPC: F02D41/40 ,  F02B3/06 ,  F02B19/08

Abstract: A diesel engine 1 includes: an injector 15; a control device which controls an injection timing of fuel 81 injected from the injector 15; and exhaust circulating means. The control device controls the injection timing of main injection and pre-injection performed prior to the main injection and executes control such that, by ensuring a premixing period of the pre-injection from start of the pre-injection until ignition of an air-fuel mixture of the fuel 81 injected by the pre-injection and the air AR, a homogenous and lean premixed air-fuel mixture is generated in the auxiliary combustion chamber 13 by the fuel 81 injected by the pre-injection and air AR, and the premixing period of the main injection from the start of the main injection until ignition of the air-fuel mixture of the fuel 81 injected by the main injection and the air AR is ensured.

公开(公告)号：US20240254953A1

公开(公告)日：2024-08-01

申请号：US18564235

申请日：2022-02-21

Applicant: KUBOTA CORPORATION

Inventor： Akira TAMURA ,  Hiroki OSO ,  Naotaro NAGAI ,  Shingo MATSUNOBU ,  Masanari TENNOMI

IPC: F02M61/14

CPC classification number: F02M61/14 ,  F02M2200/40

Abstract: An object of the present invention is to provide a fuel injection system capable of suppressing an occurrence of distortion in an injector during assembly of components. A fuel injection system (3) includes: a bracket (5) which is fixed to a cylinder head (21) of an engine (2); a fuel accumulator (6) which is supported by and fixed to the bracket (5) and which accumulates pressure of fuel supplied from a fuel pump; and an injector (7) which is directly connected to the fuel accumulator (6) and mounted to the cylinder head (21) and which injects the fuel, supplied from the fuel accumulator (6), into a combustion chamber. At least one of the fuel accumulator (6) and the bracket (5) has guide members (64, 513) which guide the injector (7) to a mount position on the cylinder head (21).

公开(公告)号：US20240011449A1

公开(公告)日：2024-01-11

申请号：US18254280

申请日：2022-02-21

Applicant: KUBOTA CORPORATION

Inventor： Yasushi KOBAYASHI ,  Shingo MATSUNOBU ,  Kiichi SUEHIRO ,  Naotaro NAGAI

IPC: F02D41/40

CPC classification number: F02D41/402

Abstract: Provided is an injector control device which is capable of setting a preceding injection amount to a fuel injection amount that is less than a main injection amount, while suppressing situations where preceding injections executed prior to a main injection in multi-stage injection are eliminated.
An injector control device 2 includes: an injection amount setting unit 211 that sets, as a total injection amount, a total of fuel injection amounts in multi-stage injection in a single cycle, and sets, as a preceding injection amount, a fuel injection amount in a preceding injection executed prior to a main injection in the multi-stage injection; an energization period setting unit 212 that sets an energization period of an injector 31 based on the fuel injection amounts set by the injection amount setting unit 211; and an injector driving unit 213 that controls driving of the injector 31 based on the energization period set by the energization period setting unit 212. The injection amount setting unit 211 sets a fuel injection amount that is a predetermined percentage of the total injection amount as the preceding injection amount.