Patents by Inventor Robert GRAUMUELLER

Robert GRAUMUELLER has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Fuel supply system for supplying a fuel emulsion to a fuel injection system of an engine
    Patent number: 12601305
    Abstract: The present invention refers to a fuel supply system of an internal combustion engine, in particular of a marine diesel engine, for supplying a fuel emulsion to a fuel injection system of the engine. The fuel supply system includes at least one actuated blending unit configured to blend a primary fuel and a secondary fuel to provide the fuel emulsion prior to being supplied to the fuel injection system.
    Type: Grant
    Filed: March 31, 2023
    Date of Patent: April 14, 2026
    Assignee: Caterpillar Motoren GmbH & Co. KG
    Inventors: Ole Ohrt, Robert Graumueller, Thorsten Tuexen
  • Fuel Supply System for Supplying a Fuel Emulsion to a Fuel Injection System of an Engine
    Publication number: 20250188882
    Abstract: The present invention refers to a fuel supply system of an internal combustion engine, in particular of a marine diesel engine, for supplying a fuel emulsion to a fuel injection system of the engine. The fuel supply system includes at least one actuated blending unit configured to blend a primary fuel and a secondary fuel to provide the fuel emulsion prior to being supplied to the fuel injection system.
    Type: Application
    Filed: March 31, 2023
    Publication date: June 12, 2025
    Applicant: Caterpillar Motoren GmbH & Co. KG
    Inventors: Ole OHRT, Robert GRAUMUELLER, Thorsten TUEXEN
  • Multi-fuel injection system and injector
    Patent number: 11773792
    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.
    Type: Grant
    Filed: December 1, 2022
    Date of Patent: October 3, 2023
    Assignee: Caterpillar Inc.
    Inventors: Dana R. Coldren, Eric L. Schroeder, Robert Graumueller, Andrew O. Marrack
  • Method and gas fuel injection unit for operating an internal combustion engine
    Patent number: 11719173
    Abstract: The present invention relates to a method for operating an internal combustion engine provided as a medium-speed gas engine or dual fuel engine in a gas fuel mode. The method comprises the step of directly injecting a gas fuel into a combustion chamber of the engine at a maximum injection pressure that is lower than a compression-end pressure of the engine.
    Type: Grant
    Filed: November 12, 2020
    Date of Patent: August 8, 2023
    Assignee: Caterpillar Motoren GmbH & Co. KG
    Inventor: Robert Graumueller
  • METHOD AND GAS FUEL INJECTION UNIT FOR OPERATING AN INTERNAL COMBUSTION ENGINE
    Publication number: 20230014909
    Abstract: The present invention relates to a method for operating an internal combustion engine provided as a medium-speed gas engine or dual fuel engine in a gas fuel mode. The method comprises the step of directly injecting a gas fuel into a combustion chamber of the engine at a maximum injection pressure that is lower than a compression-end pressure of the engine.
    Type: Application
    Filed: November 12, 2020
    Publication date: January 19, 2023
    Applicant: Caterpillar Motoren GmbH & Co. KG
    Inventor: Robert GRAUMUELLER