公开(公告)号：US11293370B1

公开(公告)日：2022-04-05

申请号：US16953841

申请日：2020-11-20

Applicant: Caterpillar Inc.

Inventor： Daniel R. Puckett ,  Andrew O. Marrack ,  Michael E. Sattler ,  Mitchell B. Juchems

IPC: F02D41/30 ,  F02D41/22 ,  F02D41/20

Abstract: A method for controlling a fuel injector of an engine system includes applying a pull-in current to close a spill valve of the fuel injector and detecting a timing at which the spill valve closes. The method also includes adjusting at least one of an amplitude of the pull-in current, a duration of the pull-in current, or a timing of a start of an application of the pull-in current based on the detected timing of the closing of the spill valve.

公开(公告)号：US10941738B1

公开(公告)日：2021-03-09

申请号：US16741386

申请日：2020-01-13

Applicant: Caterpillar Inc.

Inventor： Daniel R. Puckett ,  Andrew O. Marrack

IPC: F02M47/02 ,  F02M59/36 ,  F02M59/46 ,  F02M57/02 ,  F02D41/20

Abstract: A method of injecting fuel with a fuel injector includes applying a spill valve current to close a spill valve and applying a control valve current to move a control valve to an injection position. The method also includes discontinuing the application of the spill valve current to open the spill valve and preventing a return of the control valve to a non-injection position while detecting a timing when the spill valve opens.

公开(公告)号：US20250129760A1

公开(公告)日：2025-04-24

申请号：US18489037

申请日：2023-10-18

Applicant: Caterpillar Inc.

Inventor： Jeffrey E. Ledford ,  Mitchell Juchems ,  Andrew O. Marrack

IPC: F02M63/00 ,  F02M51/06 ,  F02M55/00 ,  F02M61/20

Abstract: A fuel injector includes a nozzle, and a nozzle check including a closing hydraulic surface. The fuel injector also includes a high pressure passage, a low pressure drain, a control passage, a check control chamber, and a valve seat. A relief passage is formed by at least one of an injector housing or a control valve in a control valve assembly. The control valve is movable among a rest position, a lifted injection position, and a lifted relief position where the high pressure passage connects to the relief passage. The control valve can be operated to selectively connect the high pressure passage to the relief passage to bleed fuel pressure to prevent over-pressurization. Related apparatus and methodology is also disclosed.

公开(公告)号：US11933257B2

公开(公告)日：2024-03-19

申请号：US17655499

申请日：2022-03-18

Applicant: Caterpillar Inc.

Inventor： Andrew O. Marrack

IPC: F02M47/02 ,  F02D41/40 ,  F02M61/10

CPC classification number: F02M47/027 ,  F02D41/40 ,  F02M61/10

Abstract: A fuel injection system includes a fuel supply passage configured to receive a pressurized fuel, a nozzle orifice downstream of the fuel supply passage, and an injection valve positionable to open the nozzle orifice and to close the nozzle orifice. The injection valve has a first configuration with a first lift and a second configuration with a second lift, the first lift being different than the second lift. The fuel injection system includes a fluid-actuated lift control valve configured to cause the injection valve to change from the first configuration to the second configuration.

公开(公告)号：US11773792B1

公开(公告)日：2023-10-03

申请号：US18073430

申请日：2022-12-01

Applicant: Caterpillar Inc.

Inventor： Dana R. Coldren ,  Eric L. Schroeder ,  Robert Graumueller ,  Andrew O. Marrack

IPC: F02D19/06 ,  F02D41/38

CPC classification number: F02D19/0694 ,  F02D41/38

Abstract: A multi-fuel injector includes a primary fuel inlet configured to receive a liquid primary fuel, a pilot fuel inlet configured to receive a liquid pilot fuel that is a different fuel than the primary fuel, and a spill valve in fluid communication with the primary fuel inlet. The fuel injector also includes a control valve configured to control a pressure of fluid within a hydraulic control chamber, and an injection valve abutting the hydraulic control chamber, the injection valve being configured to move to an injection position to inject both the primary fuel and the pilot fuel.

公开(公告)号：US11313338B1

公开(公告)日：2022-04-26

申请号：US16953900

申请日：2020-11-20

Applicant: Caterpillar Inc.

Inventor： Andrew O. Marrack ,  Daniel R. Puckett ,  Kranti K. Nellutla ,  Dustin K. Fee

IPC: F02M61/04 ,  F02M51/06 ,  F02D41/34 ,  F02D41/20

Abstract: A method for controlling a fuel injector includes applying a spill valve current, applying a control valve current, the control and spill valves including components in electrical communication with each other, and detecting a timing at which the spill valve returns to an open position based on induced spill valve current. The method includes detecting a timing at which the control valve returns to a resting position based on induced control valve current, the induced spill valve current and the induced control valve current being included in respective freewheeling currents that at least partially overlap each other, adjusting a spill valve current that is applied during an injection, based on the detected spill valve return timing, and adjusting a control valve current that is applied during the injection, based on the detected control valve return timing.