Patents by Inventor Dana Coldren

Dana Coldren 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).

  • Publication number: 20180003136
    Abstract: A fuel supply system for a reciprocating-piston engine includes a storage tank; a wall of the storage tank defining a first aperture and a second aperture therethrough; a first fuel injector fluidly coupled with the first aperture of the storage tank via a pressure control module and a first fuel injector supply conduit; a pump fluidly coupled with the second aperture of the storage tank; and a second fuel injector fluidly coupled with an outlet port of the pump via a second fuel injector supply conduit. The pressure control module is configured to maintain a pressure in the first fuel injector supply conduit within a pressure range that includes a pressure value that is less than a pressure inside the storage tank. The pump is configured to maintain a pressure inside the second fuel injector supply conduit that is greater than the pressure inside the first fuel injector supply conduit.
    Type: Application
    Filed: July 1, 2016
    Publication date: January 4, 2018
    Applicant: Caterpillar Inc.
    Inventors: Dana Coldren, Glenn Cox, David Ginter, Alan Stockner, Martin Willi
  • Patent number: 9856835
    Abstract: A fuel supply system for a reciprocating-piston engine includes a storage tank; a wall of the storage tank defining a first aperture and a second aperture therethrough; a first fuel injector fluidly coupled with the first aperture of the storage tank via a pressure control module and a first fuel injector supply conduit; a pump fluidly coupled with the second aperture of the storage tank; and a second fuel injector fluidly coupled with an outlet port of the pump via a second fuel injector supply conduit. The pressure control module is configured to maintain a pressure in the first fuel injector supply conduit within a pressure range that includes a pressure value that is less than a pressure inside the storage tank. The pump is configured to maintain a pressure inside the second fuel injector supply conduit that is greater than the pressure inside the first fuel injector supply conduit.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: January 2, 2018
    Assignee: Caterpillar Inc.
    Inventors: Dana Coldren, Glenn Cox, David Ginter, Alan Stockner, Martin Willi
  • Patent number: 8925519
    Abstract: A dual fuel system includes a plurality of fuel injectors that each have a non-injection configuration, a liquid fuel injection configuration, a gaseous fuel injection configuration and a combined fuel injection configuration. Each of the fuel injectors includes a liquid control valve member with a guide segment that defines a portion of a leak path from a liquid fuel inlet to a drain outlet, and a gas control valve member with a guide segment that defines a second leak path from the liquid fuel inlet to the drain outlet. Each injector body includes a tip component that defines both a liquid nozzle outlet set and a gas nozzle outlet set. A dual solenoid actuator has a first armature coupled to the liquid control valve member, a second armature coupled to the gas control valve member, and a shared stator.
    Type: Grant
    Filed: November 11, 2011
    Date of Patent: January 6, 2015
    Assignee: Caterpillar Inc.
    Inventors: Hoisan Kim, Mark F. Sommars, Xiangdong Ding, Dana Coldren
  • Patent number: 8443780
    Abstract: A fuel system includes a plurality of fuel injectors each defining a nozzle supply passage, a nozzle outlet and a low pressure space. The fuel system includes a plurality of mechanically actuated pressure intensifiers each including a tappet and being positioned partially within one of the fuel injectors, and a common rail fluidly connecting with each of the fuel injectors. Each of the fuel injectors further includes an injection pressure control mechanism having an injection pressure control valve. Each injection pressure control valve blocks the corresponding pressure intensifier from the common rail and fluidly connects the pressure intensifier with the low pressure space at a first position, and fluidly connects the pressure intensifier with the common rail and blocks the pressure intensifier from the low pressure space at a second position.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: May 21, 2013
    Assignee: Caterpillar Inc.
    Inventors: Dana Coldren, Alan Stockner
  • Publication number: 20130118448
    Abstract: A dual fuel system includes a plurality of fuel injectors that each have a non-injection configuration, a liquid fuel injection configuration, a gaseous fuel injection configuration and a combined fuel injection configuration. Each of the fuel injectors includes a liquid control valve member with a guide segment that defines a portion of a leak path from the a liquid fuel inlet to a drain outlet, and a gas control valve member with a guide segment that defines a second leak path from the liquid fuel inlet to the drain outlet. Each injector body includes a tip component that defines both a liquid nozzle outlet set and a gas nozzle outlet set. A dual solenoid actuator has a first armature coupled to the liquid control valve member, a second armature coupled to the gas control valve member, and a shared stator.
    Type: Application
    Filed: November 11, 2011
    Publication date: May 16, 2013
    Applicant: CATERPILLAR INC.
    Inventors: Hoisan Kim, Mark F. Sommars, Xiangdong Ding, Dana Coldren
  • Publication number: 20110290211
    Abstract: A fuel system includes a plurality of fuel injectors each defining a nozzle supply passage, a nozzle outlet and a low pressure space. The fuel system includes a plurality of mechanically actuated pressure intensifiers each including a tappet and being positioned partially within one of the fuel injectors, and a common rail fluidly connecting with each of the fuel injectors. Each of the fuel injectors further includes an injection pressure control mechanism having an injection pressure control valve. Each injection pressure control valve blocks the corresponding pressure intensifier from the common rail and fluidly connects the pressure intensifier with the low pressure space at a first position, and fluidly connects the pressure intensifier with the common rail and blocks the pressure intensifier from the low pressure space at a second position.
    Type: Application
    Filed: June 1, 2010
    Publication date: December 1, 2011
    Applicant: Caterpillar Inc.
    Inventors: Dana Coldren, Alan Stockner
  • Patent number: 7658631
    Abstract: A fuel injector includes first and second electrical actuators positioned within an injector body. First and second pairs of electrical conductors extend from a socket connector outside of the injector body to the first and second electrical actuators, respectively. The electrical conductors extend through an elastomeric sealing member that seals against fuel leakage from the fuel injector. The elastomeric sealing member provides annular sealing ridges in sealing contact with an access passage of the injector body and includes individual conductor seal passages that form seals around the outer surface of the individual electrical conductors. The elastomeric sealing member includes features that facilitate assembly of the fuel injector in a manner that reduces risk of damage to the sealing strategy.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: February 9, 2010
    Assignee: Caterpillar Inc.
    Inventors: Dana Coldren, Mandar Joshi
  • Publication number: 20100029115
    Abstract: A fuel injector includes first and second electrical actuators positioned within an injector body. First and second pairs of electrical conductors extend from a socket connector outside of the injector body to the first and second electrical actuators, respectively. The electrical conductors extend through an elastomeric sealing member that seals against fuel leakage from the fuel injector. The elastomeric sealing member provides annular sealing ridges in sealing contact with an access passage of the injector body and includes individual conductor seal passages that form seals around the outer surface of the individual electrical conductors. The elastomeric sealing member includes features that facilitate assembly of the fuel injector in a manner that reduces risk of damage to the sealing strategy.
    Type: Application
    Filed: October 9, 2009
    Publication date: February 4, 2010
    Applicant: Caterpillar Inc.
    Inventors: Dana Coldren, Mandar Joshi
  • Publication number: 20080315008
    Abstract: A fuel injector includes first and second electrical actuators positioned within an injector body. First and second pairs of electrical conductors extend from a socket connector outside of the injector body to the first and second electrical actuators, respectively. The electrical conductors extend through an elastomeric sealing member that seals against fuel leakage from the fuel injector. The elastomeric sealing member provides annular sealing ridges in sealing contact with an access passage of the injector body and includes individual conductor seal passages that form seals around the outer surface of the individual electrical conductors. The elastomeric sealing member includes features that facilitate assembly of the fuel injector in a manner that reduces risk of damage to the sealing strategy.
    Type: Application
    Filed: June 25, 2007
    Publication date: December 25, 2008
    Inventors: Dana Coldren, Mandar Joshi
  • Publication number: 20070044453
    Abstract: A parasitic load control system is provided. The system may include an exhaust producing engine and a fuel pumping mechanism configured to pressurize fuel in a pressure chamber. The system may also include an injection valve configured to cause fuel pressure to build within the pressure chamber when in a first position and allow injection of fuel from the pressure chamber into one or more combustion chambers of the engine when in a second position. The system may further include a controller configured to independently regulate the pressure in the pressure chamber and the injection of fuel into the one or more combustion chambers, to increase a load on the fuel pumping mechanism, increasing parasitic load on the engine, thereby increasing a temperature of the exhaust produced by the engine.
    Type: Application
    Filed: August 31, 2005
    Publication date: March 1, 2007
    Inventors: Aaron Strauser, Gerald Coleman, Dana Coldren
  • Publication number: 20060284129
    Abstract: An apparatus and method for controlling fluid flow is disclosed. An electromagnetic actuator may include a stator having an inner pole member and an outer pole member. The outer pole member may have a fluid passageway therein for transmitting fluid through the outer pole member. The actuator may further include a coil disposed around the inner pole member and arranged between the inner pole member and the outer pole member. The actuator may also include an armature moveable under the influence of a magnetic field generated by the stator and coil and operable to affect transmission of the fluid through the fluid passageway.
    Type: Application
    Filed: June 17, 2005
    Publication date: December 21, 2006
    Inventors: Harish Krishnaswamy, Nadeem Bunni, Stephen Lewis, Dana Coldren
  • Publication number: 20060149517
    Abstract: A spring design method is disclosed. The method begins with inputting a first set of design parameters for a spring. The design parameters include a parameter that provides an estimate of non-linearity in the spring. The spring design method determines a spring design based on the first set of design parameters. A spring design and analysis method is disclosed. The method begins with creating a spring design. The spring design includes a parameter that provides an estimate of non-linearity in the spring design. The spring design and analysis method creates a spring animation file that enables stress levels in a spring design to be identified at the coil level. The spring design method next identifies the coil in the spring design having the lowest dynamic fatigue factor and determines whether the lowest dynamic fatigue factor is acceptable.
    Type: Application
    Filed: December 30, 2004
    Publication date: July 6, 2006
    Inventors: Sami El-Sayed, Avtar Sandhu, Dana Coldren, Rabah Seffal
  • Publication number: 20050194462
    Abstract: An electronically controlled fuel injector includes a reduced part count and complexity over similar fuel injectors without a substantial reduction in performance capabilities. This is accomplished by using a one-piece needle that is hydraulically balanced and biased toward a closed position with a spring positioned in the needle control chamber. Although subtle, this injector has some ability to control the fuel pressure when the needle valve is opening and closing by adjusting a relative timing of a pressure control valve opening relative to a needle control chamber, using separate electrical actuators. The invention is particularly applicable to fuel injectors that cycle through high and low pressure states during and between injection events, respectively. Cam actuated fuel injectors being particularly well suited.
    Type: Application
    Filed: March 3, 2004
    Publication date: September 8, 2005
    Inventors: Dana Coldren, Mingchun Dong, Michael Huffman
  • Publication number: 20050173563
    Abstract: Common rail fuel injectors typically have difficulty in changing an injection rate during an injection event. Fuel injectors for this common rail fuel injection system include a multi-position admission valve. The admission valve is stoppable at a middle position to inject fuel at a low rate. The lower rate is accomplished by leaking some fuel to drain to reduce injection pressure. The admission valve is also stoppable at a fully open position to inject fuel at a high rate. Fuel injection events are ended, and the fuel injectors maintained between injection events, with the admission valve member in contact with a supply seat to close the high pressure supply passage. This strategy can be used in conjunction with a spring-biased needle valve member to expand fuel injector capabilities.
    Type: Application
    Filed: February 10, 2004
    Publication date: August 11, 2005
    Inventors: Dana Coldren, Richard Ohs, Scott Shafer, Yongxin Wang
  • Publication number: 20050150972
    Abstract: A fuel injector includes an auxiliary valve member that can assist in raising a mean injection pressure, increase a nozzle valve opening pressure, and hasten the closure rate of a nozzle valve member over an equivalent fuel injector without the auxiliary valve. The auxiliary valve member is fluidly positioned between a needle control chamber and a high pressure space, which includes a fuel pressurization chamber within the fuel injector. The auxiliary valve member includes a closing hydraulic surface exposed to fluid pressure in the high pressure space. The plumbing and the auxiliary valve member allow high pressure fuel to act upon a closing hydraulic surface of the nozzle valve member to increase valve opening pressure and mean injection pressure. The needle control chamber may be vented or may be a closed volume when the auxiliary valve member is in its closed position.
    Type: Application
    Filed: January 12, 2004
    Publication date: July 14, 2005
    Inventors: Mingchun Dong, Dana Coldren, Daniel Ibrahim
  • Patent number: 6688536
    Abstract: The present invention relates to fuel injectors having a free floating plunger. Traditional tappet assemblies include a plunger that is mechanically coupled to the tappet, and therefore, cannot be uncoupled over a portion of its movement during an injection event. In the event of a plunger seizure in a traditional tappet assembly, the tappet spring can be prevented from expanding, which can cause major valve train and engine damage. In addition, because the plunger in traditional tappet assemblies is moved to its upward position under the action of the tappet spring, the fuel passages can depressurize if fuel cannot refill the fuel pressurization chamber as quickly as the plunger retracts, causing cavitation bubbles. Therefore, the present invention utilizes a plunger that is not mechanically coupled to the tappet and can uncouple from the tappet during the injection event to address these and other problems related to plunger wear and failure.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: February 10, 2004
    Assignee: Caterpillar Inc
    Inventors: Dana Coldren, James J. Streicher, Matthew Bredesen
  • Publication number: 20010015383
    Abstract: The present invention relates to fuel injectors having a free floating plunger. Traditional tappet assemblies include a plunger that is mechanically coupled to the tappet, and therefore, cannot be uncoupled over a portion of its movement during an injection event. In the event of a plunger seizure in a traditional tappet assembly, the tappet spring can be prevented from expanding, which can cause major valve train and engine damage. In addition, because the plunger in traditional tappet assemblies is moved to its upward position under the action of the tappet spring, the fuel passages can depressurize if fuel cannot refill the fuel pressurization chamber as quickly as the plunger retracts, causing cavitation bubbles. Therefore, the present invention utilizes a plunger that is not mechanically coupled to the tappet and can uncouple from the tappet during the injection event to address these and other problems related to plunger wear and failure.
    Type: Application
    Filed: April 6, 2001
    Publication date: August 23, 2001
    Inventors: Dana Coldren, James J. Streicher, Matthew Bredesen