Patents by Inventor Dennis M. LeTang

Dennis M. LeTang 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: 20130231798
    Abstract: A web based method and system to determine the ambient conditions and/or surrounding or affecting a remote object during its travel, such as a vehicle, animal or individual. The system and method include pulling data from the world wide web to determine the travel path of the vehicle. Data from a nearby weather station is used to ascertain the ambient conditions along the travel path. Historical weather data indicative of historical ambient conditions in a geographical location may be stored in memory and used as predictor for travel conditions to be expected and used as a basis for the operation of the vehicle. When weather data is received that is outside of the historical weather data by some predetermined statistically significant amount, the actual data is used to alter the operation of the vehicle during travel.
    Type: Application
    Filed: March 2, 2012
    Publication date: September 5, 2013
    Inventors: Mark A. Zurawski, Dennis M. Letang
  • Publication number: 20090164081
    Abstract: A method to operate a vehicle with an electronically controlled internal combustion engine equipped with an electronic control unit with memory and capable of operating the engine in a cruise control mode.
    Type: Application
    Filed: December 20, 2007
    Publication date: June 25, 2009
    Applicant: Detroit Diesel Corporation
    Inventors: Victor J. Meloche, Joseph J. Michalek, Charles C. Blake, Dennis M. Letang
  • Patent number: 7374600
    Abstract: A method and system for preventing or minimizing false back pressure faults caused by a new particulate filter in an engine exhaust system. When a new particulate filter is placed in an engine exhaust system, the normal back pressure threshold for the fault detection system is increased by a new filter offset amount. Back pressure faults at the normal level are not recorded for a limited period of engine operation and only records back pressure faults that exceed the normal back pressure threshold by the value of the new filter offset.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: May 20, 2008
    Assignee: Detroit Diesel Corporation
    Inventors: Richard M. Avery, Jr., Dennis M. Letang
  • Patent number: 6671614
    Abstract: A system and method for monitoring engine operating data include monitoring various engine operating parameters and periodically storing engine data when corresponding criteria are met. In one embodiment, engine operating parameters may include engine speed, powertrain demand, or a fluid temperature, for example. Engine operating data such as oil pressure, turbo boost pressure, battery voltage, fuel economy, oil temperature, coolant temperature, maximum RPM, maximum vehicle speed, and throttle position sensor voltage, for example may be stored for trending and analysis. In addition, engine components may be monitored to determine service or replacement.
    Type: Grant
    Filed: January 14, 2002
    Date of Patent: December 30, 2003
    Assignee: Detroit Diesel Corporation
    Inventors: S. Miller Weisman, II, Dennis M. Letang
  • Publication number: 20020099496
    Abstract: A system and method for monitoring engine operating data include monitoring various engine operating parameters and periodically storing engine data when corresponding criteria are met. In one embodiment, engine operating parameters may include engine speed, powertrain demand, or a fluid temperature, for example. Engine operating data such as oil pressure, turbo boost pressure, battery voltage, fuel economy, oil temperature, coolant temperature, maximum RPM, maximum vehicle speed, and throttle position sensor voltage, for example may be stored for trending and analysis. In addition, engine components may be monitored to determine service or replacement.
    Type: Application
    Filed: January 14, 2002
    Publication date: July 25, 2002
    Applicant: Detroit Diesel Corporation
    Inventors: S. Miller Weisman, Dennis M. Letang
  • Patent number: 6330873
    Abstract: A method for comprehensive integrated control of a compression-ignition internal combustion engine having integral fuel pump-injectors utilizing an electronic control unit is disclosed. The control strategy integrates various functions of engine control including fuel delivery, cooling fan control, engine speed governing and overspeed protection, engine braking, torque control, and vehicle speed diagnostics and control. Cooling fan control is integrated with vehicle speed diagnostics and control as well as fuel delivery to provide an integrated cruise control function which incorporates engine braking. The method also includes improved control over the various engine speed governors while improving idle quality by balancing the power delivered by each of the engine cylinders when at idle. The integrated torque control employs functions to reduce NOx emissions and noise utilizing adaptive fuel delivery timing and a split injection strategy.
    Type: Grant
    Filed: December 30, 1997
    Date of Patent: December 18, 2001
    Assignee: Detroit Diesel Corporation
    Inventors: Dennis M. Letang, Douglas J. Babcock, S. Miller Weisman, II
  • Patent number: 6220223
    Abstract: A system and method for controlling an engine to limit engine output include determining engine speed, determining vehicle speed, determining a ratio based on the engine speed and the vehicle speed, comparing the ratio to a threshold, and controlling the engine to limit engine output based on the comparison. The ratio used for comparison may be selected from a plurality of ratios based on a current gear ratio which may be an actual or virtual (computed) gear ratio. The threshold may represent a low gear torque limit threshold in one embodiment. A vehicle speed sensor fault may also be considered to determine whether to limit the engine output. In one embodiment, engine output is limited by limiting engine torque.
    Type: Grant
    Filed: October 19, 1999
    Date of Patent: April 24, 2001
    Assignee: Detroit Diesel Corporation
    Inventors: S. Miller Weisman, II, Dennis M. LeTang
  • Patent number: 6067489
    Abstract: A method for comprehensive integrated control of compression-ignition internal combustion engine, wherein the control strategy integrates various functions of engine control with cooling fan control, and wherein the cooling fan control automatically ramps down cooling speed for multi-speed cooling fans whenever monitored engine conditions effecting cooling fan operation dictate transition of the multi-speed cooling fan from a high speed to an off condition.
    Type: Grant
    Filed: June 4, 1997
    Date of Patent: May 23, 2000
    Assignee: Detroit Diesel Corporation
    Inventors: Dennis M. Letang, S. Miller Weisman, II, Douglas J. Babcock
  • Patent number: 6026784
    Abstract: A method for comprehensive integrated control of an internal combustion engine, such as a compression-ignition engine or a natural gas spark-ignition engine, utilizes an electronic control module which includes an idle shutdown feature to limit the amount of time the engine is allowed to idle when the vehicle is stationary and the ambient air temperature is between calibratable limits. The system and method permit extended idle periods when the ambient air temperature is below a lower limit or above an upper limit to allow operation of the vehicle heating or cooling system, respectively. A selectable operator override permits engine idling for a calibratable period of time when requested by the operator, such as by momentarily depressing the accelerator pedal.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: February 22, 2000
    Assignee: Detroit Diesel Corporation
    Inventors: S. Miller Weisman, Dennis M. LeTang
  • Patent number: 5847644
    Abstract: A method for comprehensive integrated control of a compression-ignition internal combustion engine having integral fuel pump-injectors utilizing an electronic control unit is disclosed. The control strategy integrates various functions of engine control including fuel delivery, cooling fan control, engine speed governing and overspeed protection, engine braking, torque control, and vehicle speed diagnostics and control. Cooling fan control is integrated with vehicle speed diagnostics and control as well as fuel delivery to provide an integrated cruise control function which incorporates engine braking. The method also includes improved control over the various engine speed governors while improving idle quality by balancing the power delivered by each of the engine cylinders when at idle. The integrated torque control employs functions to reduce NOx emissions and noise injection strategy.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: December 8, 1998
    Assignee: Detroit Diesel Corporation
    Inventors: S. Miller Weisman, II, Dennis M. Letang, Douglas J. Babcock
  • Patent number: 5732676
    Abstract: A method for comprehensive integrated control of an internal combustion engine, such as a compression-ignition engine, utilizing an electronic control module (20) is disclosed. The control strategy integrates various functions of engine control including an acceleration balance test for the engine cylinders, a fuel economy vehicle speed limit adder, a fueling limit for high altitude vehicle operation, throttle logic, a data-hub for operation trending and vehicle component lifing analyses, a gear ratio torque limit, an air temperature based torque limit, enhanced cooling fan control, and an idle shutdown strategy based on ambient air temperature.
    Type: Grant
    Filed: March 12, 1997
    Date of Patent: March 31, 1998
    Assignee: Detroit Diesel Corp.
    Inventors: S. Miller Weisman, Dennis M. Letang, Douglas J. Babcock, Arnold J. Vanderbok, Eric D. Thomas
  • Patent number: 5647317
    Abstract: A method for comprehensive integrated control of a compression-ignition internal combustion engine having integral fuel pump-injectors utilizing an electronic control unit is disclosed. The control strategy integrates various functions of engine control including fuel delivery, cooling fan control, engine speed governing and overspeed protection, engine braking, torque control, and vehicle speed diagnostics and control. Cooling fan control is integrated with vehicle speed diagnostics and control as well as fuel delivery to provide an integrated cruise control function which incorporates engine braking. The method also includes improved control over the various engine speed governors while improving idle quality by balancing the power delivered by each of the engine cylinders when at idle. The integrated torque control employs functions to reduce NOx emissions and noise utilizing adaptive fuel delivery timing and a split injection strategy.
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: July 15, 1997
    Inventors: S. Miller Weisman, II, Dennis M. Letang, Douglas J. Babcock
  • Patent number: 5615654
    Abstract: A method for comprehensive integrated control of a compression-ignition internal combustion engine having integral fuel pump-injectors utilizing an electronic control unit is disclosed. The control strategy integrates various functions of engine control including fuel delivery, cooling fan control, engine speed governing and overspeed protection, engine braking, torque control, and vehicle speed diagnostics and control. Cooling fan control is integrated with vehicle speed diagnostics and control as well as fuel delivery to provide an integrated cruise control function which incorporates engine braking. The method also includes improved control over the various engine speed governors while improving idle quality by balancing the power delivered by each of the engine cylinders when at idle. The integrated torque control employs functions to reduce NOx emissions and noise utilizing adaptive fuel delivery timing and a split injection strategy.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: April 1, 1997
    Assignee: Detroit Diesel Corporation
    Inventors: S. Miller Weisman, II, Dennis M. Letang, Douglas J. Babcock
  • Patent number: 5483927
    Abstract: A method for comprehensive integrated control of a compression-ignition internal combustion engine having integral fuel pump-injectors utilizing an electronic control unit is disclosed. The control strategy integrates various functions of engine control including fuel delivery, cooling fan control, engine speed governing and overspeed protection, engine braking, torque control, and vehicle speed diagnostics and control. Cooling fan control is integrated with vehicle speed diagnostics and control as well as fuel delivery to provide an integrated cruise .control function which incorporates engine braking. The method also includes improved control over the various engine speed governors while improving idle quality by balancing the power delivered by each of the engine cylinders when at idle. The integrated torque control employs functions to reduce NOx emissions and noise utilizing adaptive fuel delivery timing and a split injection strategy.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: January 16, 1996
    Assignee: Detroit Diesel Corporation
    Inventors: Dennis M. Letang, Douglas J. Babcock, S. Miller Weisman, II
  • Patent number: 5445128
    Abstract: A method for comprehensive integrated control of a compression-ignition internal combustion engine having integral fuel pump-injectors utilizing an electronic control unit is disclosed. The control strategy integrates various functions of engine control including fuel delivery, cooling fan control, engine speed governing and overspeed protection, engine braking, torque control, and vehicle speed diagnostics and control. Cooling fan control is integrated with vehicle speed diagnostics and control as well as fuel delivery to provide an integrated cruise control function which incorporates engine braking. The method also includes improved control over the various engine speed governors while improving idle quality by balancing the power delivered by each of the engine cylinders when at idle. The integrated torque control employs functions to reduce NOx emissions and noise utilizing adaptive fuel delivery timing and a split injection strategy.
    Type: Grant
    Filed: August 27, 1993
    Date of Patent: August 29, 1995
    Assignee: Detroit Diesel Corporation
    Inventors: Dennis M. Letang, Douglas J. Babcock, S. Miller Weisman, II