Patent application number | Description | Published |
20080300747 | REAL TIME TRANSMISSION SHIFT QUALITY DETECTION AND EVALUATION UTILIZING TRANSMISSION OUTPUT SHAFT ACCELERATION - A shift quality error detection system for an automatic transmission includes a vehicle acceleration determination module to determine a vehicle acceleration. An acceptance window module defines upper and lower limits of a desired vehicle acceleration. The shift quality error detection module compares the determined vehicle acceleration to the upper and lower limits of the desired vehicle acceleration. A shift quality error detection module selectively provides a shift quality error based on the comparison. A method of detecting shift quality error of an automatic transmission comprises determining a vehicle acceleration during a transmission gear shift. The method also includes comparing the vehicle acceleration to an acceptance window of desired vehicle accelerations and outputting an error signal based on the acceleration comparison. | 12-04-2008 |
20110077123 | METHOD AND SYSTEM FOR REDUCING DELAY IN POWER DOWNSHIFTS FOR AN AUTOMATIC TRANSMISSION - A method and control module for controlling a transmission of a vehicle includes a clutch torque load predictor module generating a predicted clutch torque load signal for the shift command and a minimum clutch pressure module generating a minimum clutch pressure signal corresponding to a minimum clutch pressure. The control module includes a pressure command module generating a commanded clutch pressure signal for the predicted clutch torque load signal based on the minimum clutch pressure signal and commanding operation of a clutch with a commanded clutch pressure signal. The control module also includes a transmission control module generating the shift command after the clutch torque load predictor module generates the predicted clutch signal, the minimum clutch pressure module generates the minimum clutch pressure signal and the pressure command module generates the commanded clutch pressure signal. | 03-31-2011 |
20110088468 | SYSTEMS AND METODS FOR MEASURING VEHICLE SPEED - A system includes a processing module, a sampling module, a period determination module, and a speed determination module. The processing module generates time stamps when pulses are received from a sensor that senses a rotation of a device. The sampling module samples the time stamps during N predetermined intervals and stores N of the time stamps that correspond to the N predetermined intervals, where N is an integer that is greater than 2. The period determination module determines a plurality of periods, wherein each one of the plurality of periods is based on a difference between two of the N time stamps. The speed determination module determines a rotational speed of the device based on a difference between two of the plurality of periods. | 04-21-2011 |
20110289390 | VEHICLE COMMUNICATION SYSTEM DIAGNOSTIC USING HAMMING CODE - A control system includes an error calculation module that receives a data bit pattern having a predetermined quantity of data bits and that calculates a binary vector based on a predetermined binary matrix and the data bit pattern. The error calculation module further determines the data bit pattern contains a corrupted data bit when the binary vector is not a predetermined value. The control system further includes a bit position module that receives the binary vector, that locates the corrupted data bit based on the binary vector and that corrects the data bit pattern. The bit position module receives the data bit pattern when the binary number is the predetermined value. The data bits are pre-assigned a base-10 value that corresponds to a data bit position. | 11-24-2011 |
20130118850 | CHANGE OF MIND SHIFT CONTROL - A method of controlling shifts in a multi-speed transmission includes beginning an initial shift, which changes the transmission from a starting gear to an initial target gear, and executing an adjusted shift, which changes the transmission to an adjusted target gear having higher speed ratio than the initial target gear, when transition conditions are satisfied. The transition conditions include a threshold increase in torque request, which is sufficient to require the transmission to be placed into the adjusted target gear. The transition conditions also include a common controlling clutch, which is an off-going clutch to place the transmission in the adjusted target gear. Executing the adjusted shift does not include placing the transmission in a neutral mode. Furthermore, executing the adjusted shift does not include completing the initial shift. | 05-16-2013 |
20130297160 | SYSTEM AND METHOD FOR CONTROLLING ENGINE TORQUE TO PREVENT DRIVELINE BUMP DURING A DOWNSHIFT WHEN A THROTTLE VALVE IS CLOSED - A system according to the principles of the present disclosure includes a downshift determination module and a speed control module. The downshift determination module determines when a closed-throttle downshift occurs. The closed-throttle downshift is a downshift of a transmission when a throttle valve of an engine is closed. The speed control module controls engine speed based on turbine speed during the closed-throttle downshift. The turbine speed is a speed of a turbine in a torque converter that couples the engine to the transmission. | 11-07-2013 |