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).
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Publication number: 20130231798Abstract: 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: ApplicationFiled: March 2, 2012Publication date: September 5, 2013Inventors: Mark A. Zurawski, Dennis M. Letang
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Publication number: 20090164081Abstract: 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: ApplicationFiled: December 20, 2007Publication date: June 25, 2009Applicant: Detroit Diesel CorporationInventors: Victor J. Meloche, Joseph J. Michalek, Charles C. Blake, Dennis M. Letang
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Patent number: 7374600Abstract: 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: GrantFiled: January 28, 2005Date of Patent: May 20, 2008Assignee: Detroit Diesel CorporationInventors: Richard M. Avery, Jr., Dennis M. Letang
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Patent number: 6671614Abstract: 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: GrantFiled: January 14, 2002Date of Patent: December 30, 2003Assignee: Detroit Diesel CorporationInventors: S. Miller Weisman, II, Dennis M. Letang
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Publication number: 20020099496Abstract: 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: ApplicationFiled: January 14, 2002Publication date: July 25, 2002Applicant: Detroit Diesel CorporationInventors: S. Miller Weisman, Dennis M. Letang
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Patent number: 6330873Abstract: 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: GrantFiled: December 30, 1997Date of Patent: December 18, 2001Assignee: Detroit Diesel CorporationInventors: Dennis M. Letang, Douglas J. Babcock, S. Miller Weisman, II
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Patent number: 6220223Abstract: 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: GrantFiled: October 19, 1999Date of Patent: April 24, 2001Assignee: Detroit Diesel CorporationInventors: S. Miller Weisman, II, Dennis M. LeTang
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Patent number: 6067489Abstract: 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: GrantFiled: June 4, 1997Date of Patent: May 23, 2000Assignee: Detroit Diesel CorporationInventors: Dennis M. Letang, S. Miller Weisman, II, Douglas J. Babcock
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Patent number: 6026784Abstract: 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: GrantFiled: March 30, 1998Date of Patent: February 22, 2000Assignee: Detroit Diesel CorporationInventors: S. Miller Weisman, Dennis M. LeTang
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Patent number: 5847644Abstract: 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: GrantFiled: June 5, 1997Date of Patent: December 8, 1998Assignee: Detroit Diesel CorporationInventors: S. Miller Weisman, II, Dennis M. Letang, Douglas J. Babcock
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Patent number: 5732676Abstract: 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: GrantFiled: March 12, 1997Date of Patent: March 31, 1998Assignee: Detroit Diesel Corp.Inventors: S. Miller Weisman, Dennis M. Letang, Douglas J. Babcock, Arnold J. Vanderbok, Eric D. Thomas
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Patent number: 5647317Abstract: 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: GrantFiled: June 27, 1996Date of Patent: July 15, 1997Inventors: S. Miller Weisman, II, Dennis M. Letang, Douglas J. Babcock
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Patent number: 5615654Abstract: 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: GrantFiled: September 28, 1995Date of Patent: April 1, 1997Assignee: Detroit Diesel CorporationInventors: S. Miller Weisman, II, Dennis M. Letang, Douglas J. Babcock
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Patent number: 5483927Abstract: 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: GrantFiled: March 17, 1995Date of Patent: January 16, 1996Assignee: Detroit Diesel CorporationInventors: Dennis M. Letang, Douglas J. Babcock, S. Miller Weisman, II
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Patent number: 5445128Abstract: 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: GrantFiled: August 27, 1993Date of Patent: August 29, 1995Assignee: Detroit Diesel CorporationInventors: Dennis M. Letang, Douglas J. Babcock, S. Miller Weisman, II