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.