Patents Assigned to Cummins Engine Company, Inc.
  • Patent number: 6272587
    Abstract: In a microprocessor-based automotive control system including flash memory and a RAM cache sized substantially smaller than the storage capacity of the flash memory, a caching technique is operable, in accordance with one aspect of the invention, to move areas of the flash memory into and out of the cache. The flash memory is updated by the contents of the cache each time the a new access is attempted to an area of flash memory or after a predefined time period has elapsed since such an access has been attempted. In accordance with another aspect of the invention, 9 bit storage within the flash memory is disallowed and only word (16 bit) or longword (32 bit) storage is allowed therein, so that the flash memory is addressable only on even boundaries thereof. A software algorithm is operable to modify a request for access to an odd flash memory address so that the request properly points to an address of the cache that contains the actual data of interest.
    Type: Grant
    Filed: May 12, 1999
    Date of Patent: August 7, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventor: John M. Irons
  • Patent number: 6256992
    Abstract: The present invention relates to a system and method for managing the operation of a turbocharger and is responsible for controlling the turbocharger to cause a desired air mass flow to be provided to the engine and for protecting the turbocharger from excessive shaft speed and excessive turbine inlet temperature. The protection modes have higher priority than the performance control. First, turbocharger shaft speed is checked against a programmable limit, and the turbocharger is adjusted to bring the speed under control if its speed exceeds this limit. If the speed is not above the limit, the turbine inlet temperature is checked against a second programmable limit. If the turbocharger inlet temperature is above the predetermined limit, the turbocharger is adjusted to bring the inlet temperature under control.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: July 10, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Spencer C. Lewis, Jr., Peter Rauznitz, Mark W. Pyclik, Joseph F. Mohos, W. Barry Bryan
  • Patent number: 6253730
    Abstract: An engine compression braking system having an integral rocker lever and reset valve utilizes a single rocker lever to operate an engine in both normal power and braking modes while effectively closing an exhaust valve to define a braking mode exhaust valve opening event prior to a primary opening event. The system includes a reset valve mounted on the rocker arm a spaced distance from an actuator piston to relieve fluid pressure from a high pressure circuit after an initial opening of the exhaust valve. A reset contact element is mounted on a stationary engine component for engagement by the reset valve during movement of the rocker lever to cause opening of the reset valve and relief of the pressure. In one embodiment, a bias chamber and bias chamber supply circuit are provided to permit low pressure braking fluid to be continuously supplied to an actuator supply circuit.
    Type: Grant
    Filed: January 14, 2000
    Date of Patent: July 3, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventor: Richard J. Gustafson
  • Patent number: 6253601
    Abstract: A system and method for indicating when the oil of an engine needs to be changed. The system includes measuring engine parameters such as engine temperature, fueling rate, engine speed, and engine load. At timed intervals, soot generation, viscosity increase, and total base number (TBN) depletion are estimated through a calculation for that time interval. The estimated values from the calculations are accumulated in separate loops. Once the accumulation of soot generation, oil viscosity increase, or TBN depletion reaches a predetermined magnitude for that respective oil property, then an indication or signal is provided to indicate to the engine operator that the oil needs changing. The system is supplemented with real time sensors such as an oil level sensor, a soot sensor, and a viscosity sensor which provide a back up for the calculation of estimates and also prevent catastrophic engine conditions from not being detected through electronic calculation of estimates.
    Type: Grant
    Filed: December 28, 1998
    Date of Patent: July 3, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Jerry C. Wang, Shawn Douglas Whitacre, Matthew L. Schneider, Dean Harlan Dringenburg
  • Patent number: 6253736
    Abstract: An injector is provided which includes a nozzle valve element, a control volume, and an injection control valve for controlling fuel flow from the control volume so as to control nozzle valve movement. Importantly, the injector includes a nozzle valve lift detecting device for detecting nozzle valve lift and providing a nozzle valve element lift feedback signal. In addition, an injection control valve member movement detecting device may be provided for detecting movement of the injection control valve member into open and/or closed positions and generating a control valve member position feedback signal. One or both of the feedback signals may be used for adjusting the timing and/or rate of opening of the injection control valve thereby controlling the timing and/or rate of opening of the nozzle valve element to control the timing and/or rate of fuel injection of subsequent injection events.
    Type: Grant
    Filed: August 10, 1999
    Date of Patent: July 3, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: John D. Crofts, Mark S. Cavanagh, Howard S. Savage
  • Patent number: 6247454
    Abstract: The present invention relates to an improved fuel injector rocker lever designed to maintain relatively high fuel injection pressures when the engine speed decreases from full-rated power to torque peak conditions. The fuel injector rocker lever is designed with a size and shape so as to make the rocker lever flexible, thereby allowing the rocker lever to store and release strain energy when actuating the fuel injector. Thus, as engine speed decreases, the fuel injection pressure decreases at a lower rate when compared to a stiff actuating train because the fuel injector train is storing more strain energy due to its flexible nature. Generally, the improved rocker lever is designed with a vertically thin and horizontally wide arm which increases its width from the fuel injector actuator to the pivot point of the rocker lever. By reducing the thickness of the rocker lever, the stiffness decreases significantly, thereby permitting more strain energy to be stored and released by the rocker lever.
    Type: Grant
    Filed: May 20, 1998
    Date of Patent: June 19, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventor: Wayne C. Fu
  • Patent number: 6247377
    Abstract: An engine system with a gear train to provide engine timing. A technique to minimize backlash and noise caused by the gear train is included. An anti-backlash gear assembly useful to reduce backlash in the gear train is also disclosed. One disclosed gear assembly has at least two gear wheels with the circular thickness of the teeth of one gear wheel being less than the circular thickness of the other gear wheel. A gear assembly is also disclosed that has a bias torque of at least about 100 foot-pounds. A device carried on an anti-lash gear assembly to generally align teeth of the assembly for installation is also provided.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: June 19, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Charles E. Long, Ilya L. Piraner, Dennis R. Tibbetts
  • Patent number: 6244161
    Abstract: This invention relates to a high temperature-resistant piston head. The piston head includes a first portion formed of a first material of heat-resistant steel alloy and the second portion is formed of a second a material of steel alloy that may be the same or may or different from the first material. The first and second portions are joined by a friction weld to form the assembled piston head. The heat-resistant steel alloy includes about 0.1 to about 0.5 wt % carbon, up to about 0.6 wt % manganese, about 4.0 to about 6.0 wt % chromium, about 0.45 to about 0.65 wt % molybdenum, up to about 0.5 wt % nickel and the balance iron and incidental impurities. In one form the second material includes about 0.30 to about 0.55 wt % carbon, about 0.4 to about 1.10 wt % manganese, about 0.40 to about 1.25 wt % chromium, about 0.15 to about 0.45 wt % molybdenum, up to about 0.4 wt % silicon, up to about 2 wt % Ni and greater than about 90 wt % iron.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: June 12, 2001
    Assignees: Cummins Engine Company, Inc., Federal-Mogul World Wide, Inc.
    Inventors: Martin R. Myers, Carmo Ribeiro
  • Patent number: 6244256
    Abstract: An EGR system for an internal combustion engine has a separate, secondary high-temperature cooling loop, in addition to a primary cooling loop. In the secondary cooling loop, coolant flows through a secondary high-temperature exhaust gas cooler, which is located upstream of the primary exhaust gas cooler. A large amount of heat is transferred from the exhaust gases to the coolant in the secondary high-temperature cooling loop. The heat absorbed by the high-temperature coolant is rejected in a secondary high-temperature radiator. Heat absorbed by the primary coolant is rejected in a primary radiator. The two radiators occupy the same amount of frontal area as a single radiator used in a conventional single-stage EGR cooling system, but overall reject more heat to the ambient. In an alternate arrangement, the EGR system for a liquid-cooled internal combustion engine has a single exhaust gas cooler which is cooled by an EGR cooling loop that is independent of the engine cooling system.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: June 12, 2001
    Assignees: Behr GmbH & Co., Cummins Engine Company, Inc., Behr America, Inc.
    Inventors: John C. Wall, Markus Flik, Hans Lange
  • Patent number: 6243641
    Abstract: A system and method in which the exhaust manifold pressure is measured by a single gauge-type pressure sensor positioned in the exhaust manifold to detect misfires in all cylinders of an internal combustion engine. The pressure sensor detects the exhaust manifold pressure and feeds a signal to a microcomputer via an analog-to-digital converter. A data processing device monitors the pressure waveform created by the data from the sensor to determine if a full or partial misfire occurs. If a cylinder suffers from a partial or complete misfire, the strength of the pressure pulse for that cylinder will be reduced, thus, allowing the data processing device to identify the misfire. The data processing device may determine a misfire by computing an average peak pressure for each combustion cycle, a pressure threshold as a function of engine speed and fuel consumption rate, and a minimum pressure value based on the difference between the average peak pressure and the pressure threshold.
    Type: Grant
    Filed: October 19, 1998
    Date of Patent: June 5, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Eric B. Andrews, Axel O. zur Loye, Mark R. Stepper
  • Patent number: 6234149
    Abstract: An engine control system for optimizing a tradeoff between turbocharger lag and production of exhaust emissions including altitude and intake manifold air temperature compensation includes a turbocharger boost sensor, an engine speed sensor, an ambient pressure sensor and an intake manifold air temperature sensor, each providing appropriate sensor signals to a control computer. The control computer is operable to limit fueling signals supplied to the engine fuel system based on turbocharger boost, engine speed, ambient pressure and intake manifold air temperature to thereby optimize a tradeoff between turbocharger lag and production of black smoke and other exhaust emissions while compensating for changes in altitude and intake manifold air temperature.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: May 22, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: John R. Mills, Ward R. Edwards, John L. Hoehne, David A. Bolis, Gary C. Salemme, Lawrence H. Becker
  • Patent number: 6237002
    Abstract: There is provided a method for encoding and decoding date-oriented information associated with dates spanning the end of a century. The method of the present invention may be used with currently-known databases and other storage means for electronic information, which commonly store the date values representing dates associated with date-oriented information with a two-digit year designation. A preferred embodiment of the present invention includes dynamic windowing techniques. The encoding aspect of the method may be accomplished by altering the sequence of the digits in date values representing dates in the later century. The decoding aspect of the invention may be accomplished by placing the digits of the date value back in their pre-encoding sequence. Embodiments of the method providing for ordering date-oriented data in chronological order, either ascending or descending, are disclosed.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: May 22, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventor: Gerald K. Eichen
  • Patent number: 6230683
    Abstract: A premixed charge compression ignition engine, and a control system, is provided which effectively initiates combustion by compression ignition and maintains stable combustion while achieving extremely low nitrous oxide emissions, good overall efficiency and acceptable combustion noise and cylinder pressures. The present engine and control system effectively controls the combustion history, that is, the time at which combustion occurs, the rate of combustion, the duration of combustion and/or the completeness of combustion, by controlling the operation of certain control variables providing temperature control, pressure control, control of the mixture's autoignition properties and equivalence ratio control. The combustion control system provides active feedback control of the combustion event and includes a sensor, e.g. pressure sensor, for detecting an engine operating condition indicative of the combustion history, e.g.
    Type: Grant
    Filed: December 8, 1999
    Date of Patent: May 15, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Axel O. zur Loye, Omowoleola C. Akinyemi, Russ P. Durrett, Patrick F. Flynn, Gary L. Hunter, Greg A. Moore, Jackie M. Mudd, George G. Muntean, Julie A. Wagner, John F. Wright
  • Patent number: 6230095
    Abstract: A system and method for the diagnosis and prognosis of cylinder power imbalance in an internal combustion engine utilizes cylinder firing times to determine a differential value indicative of the power imbalance. This differential value identifies a cylinder power imbalance condition and can be used in a one dimensional or a two dimensional analysis to predict future engine performance. In one embodiment, a trend parameter is calculated from the differential values over several test sequences at periodic mileage of the vehicle. The rate and magnitude of change or deterioration of the engine performance is indicated by the trend parameter. In another embodiment, a two dimensional trend array is evaluated using singular value decomposition to arrive at an eigenvalue transformation matrix used to obtain two trend variables related to the two principal eigenvalues at a particular engine operating hour/mileage.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: May 8, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventor: Yue Yun Wang
  • Patent number: 6220933
    Abstract: A method for accurately and economically shaping a zirconia workpiece with a relatively inexpensive silicon carbide grinding wheel is provided. The grinding wheel used in the method preferably utilizes 220 mesh silicon carbide particles bound in a low porosity vitreous matrix. The grinding wheel is then rotated at a sufficient speed to implement a grinding operation, and is engaged against the zirconia workpiece at a diametral feed rate of at least 0.04 mm/sec. The method advantageously removes material from the zirconia workpiece at a high rate of speed with minimal wheel wear, and results in accurate cuts and smooth surface finishes, and also eliminates the need for dressing the wheel prior to the grinding operation.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: April 24, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Albert J. Shih, Thomas M. Yonushonis
  • Patent number: 6216461
    Abstract: An exhaust gas recirculation and control system is provided for an internal combustion engine, wherein a portion of engine exhaust gas flow is recirculated through an EGR duct to engine intake air. The recirculated exhaust gas is pumped through the EGR duct by an EGR compressor driven by a dedicated EGR drive that is independently controllable. Because the EGR drive is independently powered and controlled, the EGR flow rate capacity of the system is not dictated by, or limited, by factors such as engine exhaust flow rate. A controller modulates power delivery to the drive means in response to at least one operating condition parameter in order to achieve a desired EGR flow rate. In order to further optimize efficiency, the EGR compressor is preferably a discrete displacement pump which is controllably drivable in a pulse-capture mode, wherein each intake of the EGR compressor is timed synchronously with exhaust pulses in the exhaust manifold.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: April 17, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Josh S. Shao, Long Kung Hwang, Paul R. Miller, Stephen J. Charlton
  • Patent number: 6216460
    Abstract: An exhaust gas recirculation and control system is provided for an internal combustion engine, wherein a portion of engine exhaust gas flow is recirculated through an EGR duct to engine intake air. The recirculated exhaust gas is pumped through the EGR duct by an EGR compressor driven by a dedicated EGR drive that is independently controllable. Because the EGR drive is independently powered and controlled, the EGR flow rate capacity of the system is not dictated by, or limited, by factors such as engine exhaust flow rate. A controller modulates power delivery to the drive means in response to at least one operating condition parameter in order to achieve a desired EGR flow rate. In order to further optimize efficiency, the EGR compressor is preferably a discrete displacement pump which is controllably drivable in a pulse-capture mode, wherein each intake of the EGR compressor is timed synchronously with exhaust pulses in the exhaust manifold.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: April 17, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Josh S. Shao, Long-Kung Hwang, Paul R. Miller, Stephen J. Charlton
  • Patent number: 6213080
    Abstract: An improved method and system for automatically continuously removing an engine's used lubricating oil and injecting the used oil into the engine's fuel system throughout operation based on engine operating conditions is disclosed. The present system includes a lube oil replacement pump system for injecting small amounts of used lube oil into the engine's fuel system and recycling controlled quantities of removed used oil into the engine's lube oil system. The process periodically determines an engine operating severity value, i.e. fuel consumption value, for an interval of engine operation and calculates a base line quantity of oil for injection based on the current fuel consumption of the engine during the current interval. The lube oil pump system may be in the form of a compact, unitized lube oil replacement pump assembly integrating the various components of the system.
    Type: Grant
    Filed: September 1, 1999
    Date of Patent: April 10, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Jerry L. Marsh, John C. Kirchman, David E. Koeberlein
  • Patent number: 6210503
    Abstract: A low friction, wear-resistant pin for a cam follower roller useful in the injector and valve trains of internal combustion engines, particularly diesel engines, to enhance cam durability and life is provided. The material selected for the pin, which is selected for its wear resistance, its corrosion resistance, its low friction, and its ability to embed hard debris and other oil contaminants without scuffing, has been demonstrated to improve cam life dramatically. A preferred roller pin material that achieves this objective is a copper-based alloy, most preferably a leaded manganese silicon bronze.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: April 3, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventors: Malcolm G. Naylor, John T. Morgan, Suzanne P. Raebel, Brian J. Lance, Carl F. Musolff, Joe W. Dalton
  • Patent number: RE37241
    Abstract: A unit fuel injector adapted to receive fuel from a fuel supply at relatively low pressure and adapted to inject fuel at relatively high pressure into the combustion chamber of an internal combustion engine is provided, comprising an injector body having a first internal bore and an injector orifice and a plunger mounted for reciprocating movement within the first internal bore to define a variable volume fuel pressurization chamber including a cam actuated upper plunger portion and a lower plunger portion mounted in the first internal bore between the variable volume fuel pressurization chamber and the upper plunger portion. While the upper plunger portion is in its retracted position, low pressure fuel from the fuel supply is supplied to the variable volume fuel pressurization chamber.
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: June 26, 2001
    Assignee: Cummins Engine Company, Inc.
    Inventor: Richard J. Gustafson