Patent application number | Description | Published |
20090186743 | Vehicle Launch Using a Transmission Input Clutch - 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. | 07-23-2009 |
20100105523 | Vehicle Launch Using a Transmission Clutch - 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. | 04-29-2010 |
20110169323 | Vehicle Launch Startup Clutch Protection on a Grade - A method for controlling a vehicle powertrain includes holding the vehicle stopped on a grade by automatically producing wheel brake torque while driver demand torque is less than wheel brake torque, automatically releasing wheel brake torque when driver demand torque equals or exceeds wheel brake torque, and launching the vehicle using engine torque. | 07-14-2011 |
20110288735 | Producing Vehicle Creep Through a Transmission Without a Torque Converter - A method for controlling creep in a vehicle having no transmission torque converter, includes operating an input clutch of the transmission at a desired clutch torque capacity, using a feed-forward engine torque to minimize the impact on the engine speed when additional load on the engine occurs from increasing the clutch torque capacity, producing a desired clutch slip by controlling engine idle speed, and achieving a desired vehicle speed by controlling the input clutch torque capacity. | 11-24-2011 |
Patent application number | Description | Published |
20090107747 | Detection and Control of Power Induced Hop During Traction Control in a Vehicle - A method for controlling a powertrain of a vehicle with wheels during a traction control event is provided. The method comprises adjusting wheel torque in response to an amplitude of a band-pass filtered driven wheel speed and a direction of acceleration of driven wheels. | 04-30-2009 |
20090107748 | Stuck Vehicle with Time and Pedal Related Traction Control - A method for controlling a powertrain of a vehicle is provided for traction control. The method comprises controlling wheel slip to a first amount, the first amount independent of a driver requested output; and controlling the wheel slip to a second amount when a vehicle speed is less than a threshold for a first duration, the second amount based on the driver requested output. | 04-30-2009 |
20090112437 | Traction Control for Performance and Demonstration Spin - A method is provided for controlling a powertrain of a vehicle comprising wheels, and an accelerator pedal actuated by a driver. A method comprises controlling wheel slip to a first amount during a first road condition, the first amount independent of a driver requested output; and controlling the wheel slip to a second amount during a second road condition, the second amount based on the driver requested output, the second road condition having higher friction than the first road condition. | 04-30-2009 |
20100017070 | STABILITY CONTROL AND INCLINED SURFACE CONTROL USING A COMMON SIGNAL SOURCE - A method and system are disclosed for controlling a vehicle. The method includes adjusting a first actuator to increase vehicle stability during vehicle traveling conditions, the actuator adjusted in response to a vehicle acceleration sensor. The method also includes adjusting a second actuator to maintain vehicle position during stopped vehicle conditions on an inclined surface, the second actuator adjusted in response to the vehicle acceleration sensor. | 01-21-2010 |
20120316738 | Clutch Torque Trajectory Correction to Provide Torque Hole Filling During a Ratio Upshift - 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. Measured torque values are used during a torque phase of the upshift to correct an estimated oncoming friction element target torque so that transient torque disturbances at an oncoming clutch are avoided and torque transients at the output shaft are reduced. | 12-13-2012 |
20130153353 | CLUTCH TORQUE TRAJECTORY CORRECTION TO PROVIDE TORQUE HOLE FILLING DURING A RATIO UPSHIFT - A multiple ratio transmission having an input shaft, an output shaft and oncoming clutch and off-going clutch for effecting ratio upshifts is provided. The transmission also includes a transmission controller configured for controlling shifts. During the torque phase of a ratio upshift, the controller increases input torque. Next, the controller estimates an oncoming clutch target torque. The controller controls a torque input to ensure the off-going clutch remains locked. The controller measures an actual transmission value for a torque transmitting element of the transmission and corrects the oncoming clutch target torque using the actual transmission value whereby an increasing torque for the oncoming friction element is achieved with minimal torque transients along the output shaft during the upshift. | 06-20-2013 |
20130297107 | TRACTION CONTROL SYSTEM FOR A HYBRID VEHICLE - A controller and a control strategy for a hybrid electric vehicle includes entering a traction control event, and lowering a driving force transmitted from a driving wheel to a road surface by reducing the torque of a motor while maintaining the torque of an engine at a substantially constant torque output during a wheel slip condition of the traction control event. | 11-07-2013 |
20140038772 | Traction Control System For A Hybrid Vehicle - A method for controlling a hybrid vehicle having a traction motor and a torque converter between an engine and a step ratio automatic transmission during a traction control event. The method includes reducing motor torque, and subsequently controlling the torque converter or the step ratio automatic transmission while maintaining engine torque constant during a wheel slip condition of the traction control event to lower driving force transmitted from a driving wheel to a road surface. | 02-06-2014 |
20140121059 | Clutch Torque Trajectory Correction To Provide Torque Hole Filling During A Ratio Upshift - A multiple ratio transmission having an input shaft, an output shaft and oncoming clutch and off-going clutch for effecting ratio upshifts is provided. The transmission also includes a transmission controller configured for controlling shifts. During the torque phase of a ratio upshift, the controller increases input torque. Next, the controller estimates an oncoming clutch target torque. The controller controls a torque input to ensure the off-going clutch remains locked. The controller measures an actual transmission value for a torque transmitting element of the transmission and corrects the oncoming clutch target torque using the actual transmission value whereby an increasing torque for the oncoming friction element is achieved with minimal torque transients along the output shaft during the upshift. | 05-01-2014 |
20140277974 | AUTOMATIC TRANSMISSION SHIFT CONTROL BASED ON CLUTCH TORQUE CAPACITY DETECTION USING CALCULATED TRANSMISSION INPUT TORQUE - A system and method for controlling a vehicle powertrain having a transmission to improve shift quality is based on detection of an initial rise time of an on-coming clutch torque capacity, which indicates the start of the torque phase. The initial rise time is detected using a transmission input shaft torque computation. The system may include a vehicle powertrain having an engine, a transmission coupled to the engine via a torque converter and a controller configured to initiate torque phase control when a difference between a first transmission input shaft torque and a second transmission input shaft torque exceeds a first predetermined threshold parameter during a shift event characterized by a preparatory phase, a torque phase and an inertia phase. | 09-18-2014 |
20140287872 | Clutch Torque Trajectory Correction to Provide Torque Hole Filling during a Ratio Upshift - 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. Measured torque values are used during a torque phase of the upshift to correct an estimated oncoming friction element target torque so that transient torque disturbances at an oncoming clutch are avoided and torque transients at the output shaft are reduced. | 09-25-2014 |