公开(公告)号：US12116941B1

公开(公告)日：2024-10-15

申请号：US18228845

申请日：2023-08-01

Applicant: Caterpillar Inc.

Inventor： Mitchell B. Juchems ,  Daniel R. Puckett ,  Andrew O. Marrack ,  Kaushik Krishnamurthy

IPC: F02D1/18 ,  F02D41/00

CPC classification number: F02D1/18 ,  F02D41/009

Abstract: Operating a fuel system for an engine includes moving a plunger during a pumping cycle between an advanced position and a retracted position, and pulsing a solenoid actuator in an electrical circuit during at least one off cycle of the plunger where the plunger is neither advancing nor retracting with a plurality of current pulses of varied duration. An electrical property such as a freewheeling response in the electrical circuit induced by moving a valve in response to each respective current pulse is monitored, and a valve timing of the valve determined based on the monitored electrical property. The fuel system including a fuel injector may be electronically trimmed based on the determined valve timing. Related apparatus and control logic is also disclosed.

公开(公告)号：US12297795B1

公开(公告)日：2025-05-13

申请号：US18732686

申请日：2024-06-04

Applicant: Caterpillar Inc.

Inventor： Eric L. Schroeder ,  Dana R. Coldren ,  Robert Graumüller ,  Kaushik Krishnamurthy ,  Dean C. Diers ,  Lifeng Wang ,  Jianhua Zhang

IPC: F02M43/04 ,  F02D19/06 ,  F02M55/00

Abstract: A fuel injector in a fuel system having a first fuel supply of a first fuel and a second fuel supply of a second fuel includes a multifunctional control valve movable in the fuel injector to control admission of the first fuel to a combined-fuel outlet passage, and to control a timing and an injection pressure of a fuel charge containing the first fuel. In an embodiment the first fuel includes a compression-ignition fuel such as diesel and the second fuel includes an alcohol fuel such as methanol. Related apparatus and methodology is disclosed.