Patent application number | Description | Published |
20080249693 | METHOD OF SELECTING A TRANSMISSION SHIFT SCHEDULE - A method for selecting a shift schedule for a transmission in a motor vehicle is provided. The method includes the steps of determining whether a signal-to-noise ratio exceeds a threshold and calculating a tractive effort of the motor vehicle. A vehicle mass and a road grade is then estimated from the tractive effort using a recursive least squares estimator with multiple forgetting when the signal-to-noise ratio exceeds the threshold. A vehicle mass is selected and the road grade estimated from the vehicle mass and tractive effort when the signal-to-noise ratio does not exceed the threshold. A shift schedule is then selected based on the vehicle mass and the estimated road grade. | 10-09-2008 |
20080312034 | METHOD AND SYSTEM FOR CONTROLLING TRANSMISSION TEMPERATURE - A method for controlling a transmission in a motor vehicle includes determining a temperature of a fluid in the transmission, determining whether the torque converter lockup clutch is applied, and determining an engine torque of the motor vehicle. Then, the torque converter lockup clutch is applied and the transmission is prohibited from up-shifting if the temperature of the fluid exceeds a threshold, the torque converter lockup clutch is not applied, and the engine torque exceeds a second threshold. Next, a tractive effort of the motor vehicle is determined and the torque converter lockup clutch is deactivated when the temperature of the fluid is less than a third threshold, the tractive effort is less than a fourth threshold, or the engine torque is less than the second threshold. | 12-18-2008 |
20090215586 | TRANSMISSION TURBINE ACCELERATION CONTROL FOR MANAGING VEHICLE ACCELERATION - Methods and systems for managing acceleration of a motor vehicle having an automatic transmission by controlling transmission turbine acceleration are provided. A desired transmission turbine acceleration is determined based on vehicle speed, turbine speed, and other information obtained from the vehicle transmission. One or more torque limits are determined as a function of the turbine acceleration. The torque limits are applied to manage acceleration of the vehicle. | 08-27-2009 |
20100258080 | VARIABLE EXHAUST BRAKE CONTROL VIA TURBINE VANE POSITIONING - A control system comprising a brake torque determination module that determines a desired brake torque and a vane position determination module that determines a vane position based on an engine speed and the desired brake torque, and that adjusts the vane position to a position between an open position and a closed position. A method comprising determining a desired brake torque, determining a vane position based on an engine speed and the desired brake torque, and adjusting the vane position to a position between an open position and a closed position. | 10-14-2010 |
20120296538 | Transmission Turbine Acceleration Control for Managing Vehicle Acceleration - Methods and systems for managing acceleration of a motor vehicle having an automatic transmission by controlling transmission turbine acceleration are provided. A desired transmission turbine acceleration is determined based on vehicle speed, turbine speed, and other information obtained from the vehicle transmission. One or more torque limits are determined as a function of the turbine acceleration. The torque limits are applied to manage acceleration of the vehicle. | 11-22-2012 |
20130066528 | Method Of Optimizing Vehicle Performance Based On Countershaft Acceleration - The present invention provides a method of controlling input torque of a powered vehicle. The vehicle includes a transmission having an input shaft, an output shaft, and a countershaft. The method includes providing input torque to the input shaft, determining a rotational acceleration of the countershaft, and measuring vehicle speed. The method also includes determining a threshold based on the measured vehicle speed. The measured countershaft acceleration is compared to the threshold and the input torque is controlled based on the result of the comparison. | 03-14-2013 |
20140019023 | DOUBLE TRANSITION SHIFT CONTROL IN AN AUTOMATIC POWERSHIFTING TRANSMISSION - A system and method for controlling double transition shifts in an automatic transmission having multiple gear sections. During a double transition shift, the system performs simultaneous closed loop control of the primary oncoming clutch in the primary gear section and the secondary off-going clutch of the secondary gear section. Before the input shaft of the secondary gear section is fully pulled down or the secondary off-going clutch becomes overheated, the system switches closed loop control of the input shaft to the secondary on-coming clutch of the secondary gear section. The system utilizes model-based calculations to determine the initial clutch pressure settings when a clutch enters closed loop control. | 01-16-2014 |
20150032347 | DOUBLE TRANSITION SHIFT CONTROL IN AN AUTOMATIC POWERSHIFTING TRANSMISSION - A system and method for controlling double transition shifts in an automatic transmission having multiple gear sections. During a double transition shift, the system performs simultaneous closed loop control of the primary oncoming clutch in the primary gear section and the secondary off-going clutch of the secondary gear section. Before the input shaft of the secondary gear section is fully pulled down or the secondary off-going clutch becomes overheated, the system switches closed loop control of the input shaft to the secondary on-coming clutch of the secondary gear section. The system utilizes model-based calculations to determine the initial clutch pressure settings when a clutch enters closed loop control. | 01-29-2015 |