| GM GLOBAL TECHNOLOGY OPERATONS, INC. Patent applications |
| Patent application number | Title | Published |
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| 20100207071 | METHOD OF SELECTIVELY CONTROLLING SURFACE PROPERTIES OF THERMOPLASTIC POLYMER ARTICLES - The present disclosure relates to thermoplastic polymer articles, and methods of making and/or selectively controlling surface properties of the same. The article includes a bulk thermoplastic polymer, and a cap layer formed in-situ thereon. A resin formulation used to form the articles includes the bulk polymer in an amount ranging from about 80 wt. % to about 99.5 wt. %, and a polymer additive (which forms the cap layer) in an amount ranging from about 0.5 wt. % to about 20 wt. %. The bulk polymer viscosity ranges from about 5 to about 1000 times higher than the polymer additive viscosity, and the polymer additive is immiscible in the bulk polymer. A predetermined surface property of the polymer additive, which is not inherent in the bulk polymer, is imparted to the cap layer, and thus to the article. | 08-19-2010 |
| 20100063693 | ENGAGEMENT OF SELECTABLE ONE-WAY CLUTCH OR MECHANICAL DIODE BY ACTIVE ENGINE SPEED CONTROL - A method for controlling a powertrain includes monitoring a transmission output speed, monitoring an engine output speed, and monitoring an engine braking request. When the engine braking request is present, a target engine output speed is determined based upon the transmission output speed. Speed of the engine is commanded to the target engine output speed. When the engine braking request is present, a selectable one-way clutch slip speed is determined based upon the transmission output speed and the engine output speed. The selectable one-way clutch slip speed is utilized to further command the speed of the engine to create a zero selectable one-way clutch slip speed. And when the selectable one-way clutch slip speed equals zero, the selectable one-way clutch is engaged. | 03-11-2010 |
| 20090118934 | METHOD FOR DETERMINING A PREFERRED ENGINE OPERATION IN A HYBRID POWERTRAIN SYSTEM DURING BLENDED BRAKING - A hybrid transmission is operative to transfer power between an input member and a torque machine and an output member. A method for controlling the powertrain system during a braking event includes evaluating candidate input torques. An output torque reactable through the transmission to the driveline and limited within the range of permissible output torques is determined for the candidate engine input torque. A preferred input torque is determined. | 05-07-2009 |
| 20090118084 | METHOD AND APPARATUS TO PERFORM ASYNCHRONOUS SHIFTS WITH ONCOMING SLIPPING CLUTCH TORQUE FOR A HYBRID POWERTRAIN SYSTEM - A method to control a powertrain including a transmission, an engine, and an electric machine includes monitoring a desired transmission shift including an oncoming clutch, monitoring operational parameters of the powertrain, monitoring a maximum electric machine torque capacity, determining a desired output torque profile through the desired transmission shift, determining a maximum electric machine torque capability profile through the desired transmission shift based upon the maximum electric machine torque capacity and the operational parameters, comparing the desired output torque profile to the maximum electric machine torque capability profile, determining a preferred oncoming clutch torque profile through the desired transmission shift based upon the comparing, and executing a clutch assisted shift based upon the preferred oncoming clutch torque profile. | 05-07-2009 |
