Caterpillar Inc.

Kaushik Krishnamurthy

Andrew O Marrack

Dana Ray Coldren

Daniel Reese Puckett

Eric Lee Schroeder

Lifeng Wang

Mitchell B Juchems

Jianhua Zhang

Robert Graumüller

Brian V Tranel

Dustin K Fee

Dean C Diers

A multi-fuel injection system and method for generating combustion signals and metering signals for fuel injectors are provided. A first fuel and a second fuel may be received. A combustion signal may be generated to cause a fuel injector to perform fuel injection to inject at least one of the first fuel or the second fuel into a cylinder of an engine. A metering signal may be generated to cause the fuel injector to perform fuel metering to introduce the second fuel into a nozzle of the fuel injector while the fuel injector is not injecting either of the first fuel or the second fuel into the cylinder of the engine.

Waveform for metering fuel into a fuel injector

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.

Multi-function fuel injector valve in dual fuel system and fuel system operating method

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.

Valve timing detection in fuel system using off cycle sweep

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Manteno, IL, United States of America

Kaushik Krishnamurthy