Patents by Inventor Jahan Asgari
Jahan Asgari 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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Patent number: 8529406Abstract: A speed ratio shaft control for multiple ratio vehicle transmission has controlled release of an off-going transmission clutch and controlled engagement of an on-coming transmission clutch during a speed ratio upshift, at least one clutch being a friction torque establishing clutch. A controller, using shift-timing software strategy, actively manages in real time a clutch torque level for each clutch so that transient torque disturbances in a transmission torque output shaft are mitigated.Type: GrantFiled: November 30, 2012Date of Patent: September 10, 2013Assignee: Ford Global Technologies, LLCInventors: Yujii Fujii, Jahan Asgari, Davorin David Hrovat, Hong Jiang, Gregory Michael Pietron, Bradley Dean Riedle, Christopher John Teslak, Hongtei Eric Tseng
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Patent number: 8529405Abstract: A control system and method for controlling a multiple gear ratio automatic transmission in a powertrain for an automatic transmission having pressure activated friction torque elements to effect gear ratio upshifts. The friction torque elements are synchronously engaged and released during a torque phase of an upshift event as torque from a powertrain source is increased while allowing the off-going friction elements to slip, followed by an inertia phase during which torque from a powertrain source is modulated. A perceptible transmission output torque reduction during an upshift is avoided.Type: GrantFiled: November 27, 2012Date of Patent: September 10, 2013Assignee: Ford Global Technologies, LLCInventors: Yuji Fujii, Jahan Asgari, Davorin David Hrovat, Hong Jiang, Gregory Michael Pietron, Bradley Dean Riedle, Christopher John Teslak, Hongtei Eric Tseng
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Patent number: 8398526Abstract: A method for controlling a transmission input clutch during a vehicle launch includes determining a desired clutch torque, a desired engine torque, a desired vehicle acceleration and a desired engine speed, determining a change in clutch torque and a change in engine torque with reference to the first and second errors and current operating conditions, applying to the clutch an updated clutch torque capacity whose magnitude is the sum of the desired clutch torque and the change in engine torque, and producing an updated engine torque whose magnitude is the sum of the desired engine torque and the change in engine torque.Type: GrantFiled: January 6, 2010Date of Patent: March 19, 2013Assignee: Ford Global Technologies, LLCInventors: Davor D. Hrovat, Michael G. Fodor, Hong Jiang, Ian Oldknow, Jahan Asgari
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Patent number: 8337361Abstract: A speed ratio shaft control for multiple ratio vehicle transmission has controlled release of an off-going transmission clutch and controlled engagement of an on-coming transmission clutch during a speed ratio upshift, at least one clutch being a friction torque establishing clutch. A controller, using shift-timing software strategy, actively manages in real time a clutch torque level for each clutch so that transient torque disturbances in a transmission torque output shaft are mitigated.Type: GrantFiled: August 30, 2010Date of Patent: December 25, 2012Assignee: Ford Global Technologies, LLCInventors: Yuji Fujii, Jahan Asgari, Davorin David Hrovat, Hong Jiang, Gregory Michael Pietron, Bradley Dean Riedle, Christopher John Teslak, Hongtei Eric Tseng
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Patent number: 8328688Abstract: A control system and method for controlling a multiple gear ratio automatic transmission in a powertrain for an automatic transmission having pressure activated friction torque elements to effect gear ratio upshifts. The friction torque elements are synchronously engaged and released during a torque phase of an upshift event as torque from a torque source is increased while allowing the off-going friction elements to slip, followed by an inertia phase during which torque from a torque source is modulated. A perceptible transmission output torque reduction during an upshift is avoided.Type: GrantFiled: August 18, 2010Date of Patent: December 11, 2012Assignee: Ford Global Technologies, LLCInventors: Yuji Fujii, Jahan Asgari, Davorin David Hrovat, Hong Jiang, Gregory Michael Pietron, Bradley Dean Riedle, Christopher John Teslak, Hongtei Eric Tseng
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Patent number: 8060275Abstract: An on-board diagnostic system of a vehicle comprises disabling diagnostic operation, such as a misfire monitor, based on road roughness. In one example, the disabling of the diagnostic operation is based on brake actuation and degradation of an anti-lock braking system.Type: GrantFiled: January 19, 2007Date of Patent: November 15, 2011Assignee: Ford Global Technologies, LLCInventors: Jahan Asgari, Timothy Feldkamp, Craig Stephens, Moses Fridman, Davor Hrovat, Arthur Varady, Mitch McConnell
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Patent number: 7998026Abstract: A method for controlling a transmission input clutch during a vehicle launch includes selecting a subject device that transmits torque between an input and an output, a providing a mathematical model of the subject device, such that the model employing only static relationships of engine speed and transmission input speed to a desired magnitude of torque produced by the subject device, using the model, the current engine speed and the current engine speed to determine the desired torque produced by the subject device, and adjusting the torque capacity of the clutch to the desired torque of the subject device determined from the model.Type: GrantFiled: January 17, 2008Date of Patent: August 16, 2011Assignee: Ford Global Technologies, LLCInventors: Michael G. Fodor, Davor D. Hrovat, Hong Jiang, Ian Oldknow, Jahan Asgari
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Publication number: 20110184612Abstract: A control system and method for controlling a multiple gear ratio automatic transmission in a powertrain for an automatic transmission having pressure activated friction torque elements to effect gear ratio upshifts. The friction torque elements are synchronously engaged and released during a torque phase of an upshift event as torque from a torque source is increased while allowing the off-going friction elements to slip, followed by an inertia phase during which torque from a torque source is modulated. A perceptible transmission output torque reduction during an upshift is avoided.Type: ApplicationFiled: August 18, 2010Publication date: July 28, 2011Applicant: FORD GLOBAL TECHNOLOGIES, LLCInventors: Yuji Fujii, Jahan Asgari, Davorin David Hrovat, Hong Jiang, Gregory Michael Pietron, Bradley Dean Riedle, Christopher John Teslak, Hongtei Eric Tseng
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Publication number: 20110184613Abstract: A speed ratio shaft control for multiple ratio vehicle transmission has controlled release of an off-going transmission clutch and controlled engagement of an on-coming transmission clutch during a speed ratio upshift, at least one clutch being a friction torque establishing clutch. A controller, using shift-timing software strategy, actively manages in real time a clutch torque level for each clutch so that transient torque disturbances in a transmission torque output shaft are mitigated.Type: ApplicationFiled: August 30, 2010Publication date: July 28, 2011Applicant: FORD GLOBAL TECHNOLOGIES, LLCInventors: Yuji Fujii, Jahan Asgari, Davorin David Hrovat, Hong Jiang, Gregory Michael Pietron, Bradley Dean Riedle, Christopher John Teslak, Hongtei Eric Tseng
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Publication number: 20100105523Abstract: A method for controlling a transmission input clutch during a vehicle launch includes determining a desired clutch torque, a desired engine torque, a desired vehicle acceleration and a desired engine speed, determining a change in clutch torque and a change in engine torque with reference to the first and second errors and current operating conditions, applying to the clutch an updated clutch torque capacity whose magnitude is the sum of the desired clutch torque and the change in engine torque, and producing an updated engine torque whose magnitude is the sum of the desired engine torque and the change in engine torque.Type: ApplicationFiled: January 6, 2010Publication date: April 29, 2010Applicant: FORD GLOBAL TECHNOLOGIES, LLCInventors: Davor D. Hrovat, Michael G. Fodor, Hong Jiang, Ian Oldknow, Jahan Asgari
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Patent number: 7571044Abstract: A method for controlling a vehicle having a suspension is provided. The method comprises, during longitudinal oscillations of the vehicle, adjusting a suspension member to vary a normal force between the vehicle and the surface, where the suspension adjustment is based on the longitudinal oscillations.Type: GrantFiled: April 27, 2006Date of Patent: August 4, 2009Assignee: Ford Global Technologies, LLCInventors: Todd Brown, Jahan Asgari, Eric Tseng, Davor Hrovat
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Publication number: 20090186743Abstract: A method for controlling a transmission input clutch during a vehicle launch includes selecting a subject device that transmits torque between an input and an output, a providing a mathematical model of the subject device, such that the model employing only static relationships of engine speed and transmission input speed to a desired magnitude of torque produced by the subject device, using the model, the current engine speed and the current engine speed to determine the desired torque produced by the subject device, and adjusting the torque capacity of the clutch to the desired torque of the subject device determined from the model.Type: ApplicationFiled: January 17, 2008Publication date: July 23, 2009Inventors: Michael G. Fodor, Davor D. Hrovat, Jahan Asgari, Hong Jiang, Ian Oldknow
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Patent number: 7451034Abstract: A method for controlling slip of a driven wheel on low friction surfaces includes determining the current magnitude of static tire friction potential, current magnitude of maximum dynamic tire friction potential, and magnitude of tire torque demanded by an operator of the vehicle. A lower magnitude of commanded tire force is set less than the estimated current magnitude of static tire friction potential. The magnitude of demanded wheel torque and the estimated current magnitude of maximum dynamic tire friction potential are used to set an upper magnitude of commanded tire force. The magnitude of commanded tire force is changed in a sequence of saw-tooth pulses, each pulse including an increasing ramp of tire force from the lower commanded tire force to the upper commanded tire force, the ramp having a predetermined slope, and a step that reduces the magnitude of commanded tire force between each pulse to the lower commanded tire force.Type: GrantFiled: March 10, 2006Date of Patent: November 11, 2008Assignee: Ford Global Technologies, LLCInventors: Josko Deur, Jahan Asgari, Davor Hrovat
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Publication number: 20080177437Abstract: An on-board diagnostic system of a vehicle comprises a diagnostic component configured to detect a vehicle operating condition and to produce an error output when the vehicle operating condition is determined to be abnormal; and a rough road detector configured to determine an average level of roughness of a road surface based on signals from wheel speed sensors, to compare the roughness with a predetermined threshold, and to disable the error output of the diagnostic component or switch to an alternate calibration for the diagnostic component if the roughness level has exceeded the predetermined threshold.Type: ApplicationFiled: January 19, 2007Publication date: July 24, 2008Inventors: Jahan Asgari, Timothy Feldkamp, Craig Stephens, Moses Fridman, Davor Hrovat, Arthur Varady, Mitch McConnell
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Publication number: 20070255465Abstract: A method for controlling a vehicle having a suspension, the method comprising during longitudinal oscillations of the vehicle, adjusting a suspension member to vary a normal force between the vehicle and the surface, where said suspension adjustment is based on said longitudinal oscillations.Type: ApplicationFiled: April 27, 2006Publication date: November 1, 2007Inventors: Todd Brown, Jahan Asgari, Eric Tseng, Davor Hrovat
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Publication number: 20070213912Abstract: A method for controlling slip of a driven wheel on low friction surfaces includes determining the current magnitude of static tire friction potential, current magnitude of maximum dynamic tire friction potential, and magnitude of tire torque demanded by an operator of the vehicle. A lower magnitude of commanded tire force is set less than the estimated current magnitude of static tire friction potential. The magnitude of demanded wheel torque and the estimated current magnitude of maximum dynamic tire friction potential are used to set an upper magnitude of commanded tire force. The magnitude of commanded tire force is changed in a sequence of saw-tooth pulses, each pulse including an increasing ramp of tire force from the lower commanded tire force to the upper commanded tire force, the ramp having a predetermined slope, and a step that reduces the magnitude of commanded tire force between each pulse to the lower commanded tire force.Type: ApplicationFiled: March 10, 2006Publication date: September 13, 2007Inventors: Josko Deur, Jahan Asgari, Davor Hrovat