Patents by Inventor Lester L. Peters

Lester L. Peters 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).

  • Patent number: 5983863
    Abstract: A unitized fuel supply assembly is disclosed including an in-line reciprocating cam driven pump (14) for supplying fuel to an accumulator (12) from which fuel is directed to a plurality of engine cylinders by means of a distributor (16) mounted on the unitized assembly. Dual pump control valves (20) provide fail safe electronic control over the effective pump displacement. One or more injection control valves mounted on the distributor are provided to control injection timing and quantity. The accumulator (12) contains a labyrinth of interconnected chambers (36) which are shaped and positioned to produce a minimum overall package size while providing for easy manufacture.
    Type: Grant
    Filed: June 16, 1995
    Date of Patent: November 16, 1999
    Assignee: Cummins Engine Company, Inc.
    Inventors: Mark S. Cavanagh, Bryan W. Swank, Arpad M. Pataki, Bela Doszpoly, John D. Lane, Kent V. Shields, Richard D. Kraus, W. Beale Delano, Julius P. Perr, Jy-Jen Frank Sah, Alexander Guluk, Lester L. Peters
  • Patent number: 5979803
    Abstract: An improved fuel injector for providing precise control over injection timing, quantity and rate shape is provided which includes a fuel pressure balancing device for balancing the fuel pressure forces acting on a needle valve element while the element is in both the closed and open positions thereby permitting an actuator to more precisely and predictably control the movement of the needle valve element. The fuel pressure balancing device includes a cavity formed in the needle valve element and pressure balancing surfaces formed on the needle valve element and positioned in the cavity. The actuator may be a piezoelectric actuator for compressing actuating fluid in an actuating fluid circuit which includes a fluid chamber positioned adjacent a needle valve element and fluidically separate from a fuel supply circuit for supplying high pressure fuel for injection. Actuating fluid pressure in the chamber acts on the needle valve element to initiate injection.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: November 9, 1999
    Assignee: Cummins Engine Company
    Inventors: Lester L. Peters, Julius P. Perr, Benjamin M. Yen, George L. Muntean, J. Victor Perr, John D. Crofts
  • Patent number: 5954029
    Abstract: A fuel injector for periodically injecting fuel pulses of a variable quantity on a cycle to cycle basis as a function of the pressure of fuel supplied to the injector from a source of fuel and at a constant time during each cycle is set forth including an injector body containing a central bore and an injection orifice at the lower end of the body and a reciprocating plunger assembly including an upper plunger section and a lower plunger section serially mounted within the central bore to define a variable volume metering chamber located between the lower plunger section and the lower end of the injector body containing the injection orifice. The variable volume metering chamber communicates during a portion of each injector cycle with the source of fuel.
    Type: Grant
    Filed: January 25, 1995
    Date of Patent: September 21, 1999
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, Julius P. Perr, Bai Mao Yen
  • Patent number: 5937807
    Abstract: An exhaust valve system for an internal combustion engine including a turbocharger is provided for effectively increasing the turbocharged boost pressure at low load engine conditions thereby effectively improving engine transient response. The exhaust valve system includes an exhaust valve control device operable in a normal timing mode for permitting normal opening of one or more exhaust valves at a normal opening crank angle, and in an advanced timing mode for advancing the timing of the opening of the exhaust valve to an advanced opening crank angle prior to the normal opening crank angle while maintaining the timing of normal closing of the exhaust valves at a normal closing crank angle.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: August 17, 1999
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, David A. Vittorio, P. Douglas Free, Amarjit S. Ghuman, Harold G. Weber, Canden R. Nelson
  • Patent number: 5899389
    Abstract: A fuel injector assembly is provided which operates to effectively creating a low injection flow rate followed by a high injection flow rate during all engine operating conditions, including idle and low engine speed conditions, to produce a high quality fuel spray with proper atomization and thus improved fuel air mixing resulting in improved emissions abatement and fuel economy. The assembly includes two biased valve elements designed to sequentially open and close to initially open a limited number of orifices followed by the opening of a remainder of the orifices thereby effectively varying the available cross sectional flow area from the nozzle cavity into the combustion chamber of the engine during the injection event. The nozzle valve elements may be spring biased or fluid pressure biased and include biasing surfaces sized to cause the sequential opening and closing of the elements.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: May 4, 1999
    Assignee: Cummins Engine Company, Inc.
    Inventors: Arpad M. Pataki, Lester L. Peters, Benjamin M. Yen, Julius P. Perr
  • Patent number: 5894992
    Abstract: Fuel injection rate shaping is integrated into the pressure intensification stage of a hydraulically actuated fuel injector having a pressure intensifier. In a first embodiment, the pressure intensification plunger is formed of two parts creating a damping chamber therebetween from which fluid is forced out through orifices in a lower one of the plunger parts during an initial phase of displacement of the upper part. Thus, injection will be performed initially at a lower pressure and rate, which increases once the plunger parts make contact. In a second embodiment, a throttled flow is set via a restrictor housing that telescopingly receives the upper plunger part, so that a lower injection rate occurs while fluid is bled off through a restricted flow path between the restrictor housing and the upper plunger part, and a higher injection rate is produced once a port in the upper plunger clears the restrictor housing.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: April 20, 1999
    Assignee: Cummins Engine Company, Inc.
    Inventors: Chung Y. Liu, Amarjit S. Ghuman, Benjamin M. Yen, Lester L. Peters, Edward D. Smith
  • Patent number: 5884611
    Abstract: An effervescent fuel injector, particularly one suitable for diesel and direct injection engine applications, which is capable of injecting, particularly intermittently, an atomized fuel spray with droplets of a size in the range of 5-6 micron SMD without requiring high pressures is achieved in a preferred embodiment effervescent fuel injector of the valve covered orifice (VCO) type having primary and secondary nozzle valves which remain closed when the control valve is not actuated, but which open one or two sets of nozzle orifices depending on fuel volume requirements. A three-way, on-off control valve is used to trigger commencement of the supply of gas via a control valve simultaneously with opening of at least some of the nozzle orifices. Gas and fuel are mixed in a mixing chamber located upstream of the nozzle valves in a manner creating a gas-fuel aeration, and as the aeration is sprayed from the nozzle orifices, the gas expands rapidly breaking the fuel into fine droplets.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: March 23, 1999
    Assignee: Cummins Engine Company, Inc.
    Inventors: Yul J. Tarr, Laszlo D. Tikk, Wayne A. Eckerle, Lester L. Peters
  • Patent number: 5769319
    Abstract: An injection rate shaping nozzle assembly for a fuel injector is provided which includes a closed nozzle valve element and a rate shaping control device including an injection spill circuit for spilling a portion of the fuel to be injected to produce a predetermined time varying change in the flow rate of fuel injected into a combustion chamber. The spill circuit includes a spill passage integrally formed in the nozzle valve element. The rate shaping control may include a spill valve for controlling the spill flow through the spill circuit to create a low injection flow rate followed by a high injection flow rate. The spill passage may communicate with the injector nozzle cavity between injection events or alternatively may be blocked to prevent spill flow between injection events. The rate shaping control device may include a spill accelerating device in the form of a spill chamber formed in the nozzle valve element for creating a rapid increase in the spill flow rate.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: June 23, 1998
    Assignee: Cummins Engine Company, Inc.
    Inventors: B. M. Yen, Lester L. Peters, J. P. Perr, A. S. Ghuman, Dennis Ashwill
  • Patent number: 5765755
    Abstract: An injection rate shaping nozzle assembly for a fuel injector is provided which includes a closed nozzle valve element and a rate shaping control device including an injection spill circuit for spilling a portion of the fuel to be injected to produce a predetermined time varying change in the flow rate of fuel injected into a combustion chamber. The spill circuit includes a spill passage integrally formed in the nozzle valve element. The rate shaping control device may include a spill accelerating chamber in formed in the nozzle valve element for creating a rapid increase in the spill flow rate. A spill circuit purge device is provided to remove fuel from the spill circuit and accelerating chamber between each of the injection events thereby ensuring an unimpeded, effective spill fuel flow during the next spill event.
    Type: Grant
    Filed: January 23, 1997
    Date of Patent: June 16, 1998
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, Julius P. Perr, A. S. Ghuman, Benjamin M. Yen, Chad L. Buchanan, Robert Samuel, Kevin L. Vogt, John T. Carroll, III, James E. Denton, David E. Schisler
  • Patent number: 5713335
    Abstract: In accordance with preferred embodiments of the invention a timing adjustment device includes a cam follower that is engaged between an overhead cam and an injector rocker arm, and is mounted on a rotatable eccentric shaft. The geometry of the eccentric shaft and cam follower is designed so that, as timing is varied by rotation of the eccentric shaft, no change is produced in the vertical height of the rocker arm when the cam shaft is on the outer base circle and the injector is bottomed, in order to assure that the "mechanical crush" of the PT type injector is constant despite changes in timing. In a first application of the timing arrangement, it is used together with a simple injector, which does not utilize a multi-plunger arrangement to form a hydraulic link, to achieve lower parasitic losses.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: February 3, 1998
    Assignee: Cummins Engine Company, Inc.
    Inventors: Julius P. Perr, Lester L. Peters, Amarjit S. Ghuman, Benjamin M. Yen, Edward D. Smith, David L. Buchanan, Yul J. Tarr, Laszlo D. Tikk, Andrew G. Stiles
  • Patent number: 5647536
    Abstract: An injection rate shaping nozzle assembly for a fuel injector is provided which includes a closed nozzle valve element and a rate shaping control device including an injection spill circuit for spilling a portion of the fuel to be injected to produce a predetermined time varying change in the flow rate of fuel injected into a combustion chamber. The spill circuit includes a spill passage integrally formed in the nozzle valve element. The rate shaping control may include a spill valve for controlling the spill flow through the spill circuit to create a low injection flow rate followed by a high injection flow rate. The spill passage may communicate with the injector nozzle cavity between injection events or alternatively may be blocked to prevent spill flow between injection events. The rate shaping control device may include a spill accelerating device in the form of a spill chamber formed in the nozzle valve element for creating a rapid increase in the spill flow rate.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: July 15, 1997
    Assignee: Cummins Engine Company, Inc.
    Inventors: B. M. Yen, Lester L. Peters, J. P. Perr, A. S. Ghuman, Dennis Ashwill
  • Patent number: 5619969
    Abstract: A fuel injection rate shaping control system is provided which effectively controls the flow rate of fuel injected into the combustion chamber of an engine to improve combustion and reduce emissions by controlling the rate of pressure increase during injection. The injection rate shaping control system includes a rate shaping control device including a rate shaping transfer passage having a predetermined length and diameter specifically designed to create a desired injection pressure rate shape. In other embodiments of the present invention, two or more rate shaping transfer passages capable of producing distinct rate shapes are packaged in various fuel injection systems to selectively provide various rate shapes depending on operating conditions. Switching valves, i.e., solenoid operated three-way valves, may be used to direct the fuel or timing fluid flow to any one of the rate shaping transfer passages.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: April 15, 1997
    Assignee: Cummins Engine Company, Inc.
    Inventors: Chung Y. Liu, Benjamin M. Yen, Lester L. Peters, Julius P. Perr, Russ P. Durrett, Donald N. Case, Dennis Ashwill, Chris Sorg, John Lane, Mark Cavanagh
  • Patent number: 5611317
    Abstract: A cam operated open nozzle fuel injector is provided comprising a reciprocating plunger assembly including an outer plunger, an inner plunger and a variable volume timing chamber located between the plungers. A hold down force generating means includes a cam having a hold down cam or ramp portion for maintaining the inner plunger in an innermost position against the inner end of the injector body with a sufficient hold down force during each hold down period throughout injector operation independently of injector train wear. The hold down cam portion operates to move the outer plunger inwardly towards the inner plunger throughout a substantial portion of the hold down period. The hold down cam portion functions to compensate for fuel drainage from the timing chamber so as to maintain a predetermined pressure in the timing chamber corresponding to a desired hold down force.
    Type: Grant
    Filed: August 9, 1995
    Date of Patent: March 18, 1997
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, Julius P. Perr, Yul J. Tarr
  • Patent number: 5607106
    Abstract: A low inertia, wear-resistant needle valve assembly is provided for an internal combustion engine closed nozzle unit fuel injector. The needle valve assembly includes a needle and spring retainer subassembly made from an advanced structural ceramic, such as silicon nitride. A valve seat subassembly in the injector cup is made from a combination of metal and ceramic. The assembly materials and configuration provide maximum control over the efficiency of the injection event so that the fuel injection event can be terminated quickly, thereby allowing more effective control over exhaust emissions.
    Type: Grant
    Filed: August 10, 1994
    Date of Patent: March 4, 1997
    Assignees: Cummins Engine Company, Toshiba Corporation
    Inventors: Joseph C. Bentz, John T. Carroll, III, Lester L. Peters, Thomas M. Yonushonis, Jeffrey L. Campbell
  • Patent number: 5533672
    Abstract: In a closed-nozzle fuel injector, an injection timing chamber and an injection chamber and a metering plunger/valve moving in a bore between them. A passage from the injection chamber to the injection spray ports is closed by a needle valve. A piston cup seats one end of a needle valve closing spring, the other end being seated on the needle timing spill passageway is opened by a metering plunger and spills fuel from the injector timing chamber to drive an injection needle-valve-spring-loading-piston away from a rest position toward the spring seat on the valve and apply additional force on the valve-closing-spring at the end of injection. In one embodiment, a passageway from the space above the spring-loading piston to a drain line has an orifice therein to maintain pressure atop the piston to hold the valve closed long enough for combustion pressure in the cylinder to drop before return of the spring seat piston to original rest position.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: July 9, 1996
    Assignee: Cummins Engine Company, Inc.
    Inventor: Lester L. Peters
  • Patent number: 5518030
    Abstract: A solenoid valve for use in a fuel system includes a valve body with a central core and three interconnected passageways. A spool is disposed within the central core and by means of enlarged and reduced diameter portions controls the flow through the solenoid valve. Solenoid armatures cooperatively control movement of the valve spool which is sized and shaped so as to provide a fuel flow path from an inlet passageway to an outlet passageway when the solenoid valve is in an opened condition. When the spool is shifted to a closed condition, incoming fuel is blocked and a flow path is created from the output passageway to a drain passageway, The drain passageway allows excess fuel in the injector to drain to relieve fuel pressure on the metering plunger. As the spool moves from a closed condition to an opened condition, some fuel flows to the drain passageway. The amount of fuel "loss" depends on the speed of the spool and the size of the drain passageway.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: May 21, 1996
    Assignee: Cummins Engine Company, Inc.
    Inventors: Chung Y. Liu, Benjamin M. Yen, Lester L. Peters, Julius P. Perr
  • Patent number: 5441027
    Abstract: A metering system is provided which controls the amount of fuel supplied to the combustion chambers of a multi-cylinder internal combustion engine comprising a fuel pump for supplying fuel at low pressure to a first and a second group of unit fuel injectors, a first solenoid-operated fuel control valve controlling the flow of fuel to the first set of injectors and a second solenoid-operated fuel control valve controlling the flow of fuel to the second set of injectors. The system may also include first and second solenoid-operated timing fluid control valves associated with the first and the second group of injectors, respectively. The injectors are capable of being in the fuel receiving mode, establishing a metering period, and the timing receiving mode, establishing a timing period, at the same time to increase the amount of time available for metering both timing fluid and fuel.
    Type: Grant
    Filed: March 10, 1994
    Date of Patent: August 15, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: David L. Buchanon, Lester L. Peters, Julius P. Perr, Yul J. Tarr
  • Patent number: 5409165
    Abstract: A highly wear-resistant plunger assembly for a fuel injector, particularly an open nozzle fuel injector, is provided. The wear-resistant plunger assembly of the present invention includes components formed from wear-resistant materials specifically including, but not limited to, ceramics and metals capable of withstanding the high temperatures and frictional forces produced by prolonged motoring and other potentially adverse engine operating conditions. Different portions of the plunger assembly may be formed from different kinds of wear-resistant materials.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: April 25, 1995
    Assignees: Cummins Engine Company, Inc., Toshiba Corp.
    Inventors: John T. Carroll, III, Katsuhiro Shinosawa, Lester L. Peters, Jeffrey L. Campbell, Joseph C. Bentz
  • Patent number: 5404855
    Abstract: A variable displacement high pressure pump having a plurality of high pressure pumping units which receive fuel from a low pressure fuel pump. A rotary cam-driven roller tappet, for producing pumping displacement of the pumping plunger of a respective pumping element, is connected to the pumping plunger by a separated link in a manner permitting the pumping plunger to float relative to the roller tappet during at least a portion of each pumping cycle. As a result, the capacity of the pumping chamber can be limited to an extent that is less than the full stroke achievable by the pumping plunger being retracted to the maximum extent which is permitted by the driving cam.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: April 11, 1995
    Assignee: Cummins Engine Company, Inc.
    Inventors: Bai-Mao Yen, Lester L. Peters, Julius P. Perr, Bryan W. Swank
  • Patent number: 5353766
    Abstract: A fuel distributor is provided which is capable of distributing fuel through plural fuel injection lines to the corresponding cylinders of a multicylinder internal combustion engine and which includes a distributor housing including a supply inlet passage, a plurality of fuel injection outlet passages and a plurality of distributor valves for providing sequential periodic fluidic communication between the supply inlet passage and the outlet passages. Each distributor valve, which may be cam-actuated or solenoid-actuated, is adapted to be placed in an open position to define a fuel injection period during which high pressure fuel may flow through the distributor valve to the respective engine cylinder and a closed position blocking fuel flow through the respective fuel injection outlet passage.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: October 11, 1994
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, Bai M. Yen, Julius P. Perr