公开(公告)号：US20240044283A1

公开(公告)日：2024-02-08

申请号：US18266586

申请日：2021-10-25

Applicant: KUBOTA Corporation

Inventor： Hiroki OSO ,  Yuki TAGASHIRA ,  Akira TAMURA ,  Rina KANEKO ,  Kiichi SUEHIRO

IPC: F02B19/18 ,  F01P1/10 ,  F02M61/14 ,  F02F11/00

CPC classification number: F02B19/18 ,  F01P1/10 ,  F02M61/14 ,  F02F11/002

Abstract: Provided is an electronic fuel injection type diesel engine capable of performing precise electronic fuel injection control. A fuel injector includes a main body portion having a large diameter, a nozzle portion having a small diameter, and a pressing surface formed at a step portion between the main body portion and the nozzle portion, in which the nozzle portion of the fuel injector is inserted from an inside of a sleeve into an inside of an insertion hole, the fuel injector is pressed toward a vortex chamber by a pressing force, and the pressing force applied to the fuel injector is received by a pressure receiving surface of the sleeve from the pressing surface of the fuel injector via the washer.

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.

公开(公告)号：US20240254940A1

公开(公告)日：2024-08-01

申请号：US18565224

申请日：2022-02-21

Applicant: KUBOTA CORPORATION

Inventor： Yasushi KOBAYASHI ,  Hiroki OSO ,  Kiichi SUEHIRO ,  Yuki TAGASHIRA ,  Koji NAKAKITA

IPC: F02D41/40 ,  F02D41/20

CPC classification number: F02D41/406 ,  F02D2041/2058

Abstract: A diesel engine 30 includes an injector 4 that uses a solenoid to directly drive a needle valve and inject a fuel and an injector control device 2 that controls the driving by the injector 4. The injector control device 2 includes a charge voltage control circuit 22, a storage unit 25 that stores a correction value related to an injection amount of the fuel injected from the injector 4, and an injector control circuit 24 that controls the driving by the injector 4 on the basis of each of a voltage supplied from the charge voltage control circuit 22 and the correction value stored in the storage unit 25. The correction value is set according to a voltage applied to a terminal of the injector control device 2 connected to a load when a current starts to flow in the load connected to the injector control device 2.