US 9,810,190 B2
Method and apparatus for executing engine autostart in a powertrain system employing multiple torque generating devices
Meng Wang, Novi, MI (US); Anthony Christman, Madison Heights, MI (US); Poh Fong Chin, Novi, MI (US); John Janczak, Commerce Township, MI (US); Anthony H. Heap, Ann Arbor, MI (US); Kee Yong Kim, Ann Arbor, MI (US); Bryan J. Morton, Saline, MI (US); and Goro Tamai, Bloomfield Hills, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Apr. 23, 2015, as Appl. No. 14/694,529.
Prior Publication US 2016/0312754 A1, Oct. 27, 2016
Int. Cl. F02N 11/08 (2006.01); F02D 29/02 (2006.01); B60W 10/26 (2006.01); B60W 10/06 (2006.01); B60W 20/50 (2016.01); B60W 20/13 (2016.01)
CPC F02N 11/0803 (2013.01) [B60W 10/06 (2013.01); B60W 10/26 (2013.01); B60W 20/13 (2016.01); B60W 20/50 (2013.01); F02D 29/02 (2013.01); B60W 2400/00 (2013.01); B60W 2510/0657 (2013.01); B60W 2510/244 (2013.01); B60W 2710/06 (2013.01); F02D 2200/1002 (2013.01); F02D 2250/21 (2013.01); F02D 2250/26 (2013.01); Y10S 903/905 (2013.01); Y10S 903/93 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for controlling a powertrain system that includes an internal combustion engine, an electric machine configured to generate propulsion torque responsive to a driver torque request and an energy storage device electrically connected to the electric machine, the method comprising:
requesting execution of an engine autostart operation;
evaluating, via a controller, whether a driveline torque sag will occur during the execution of the engine autostart operation prior to the engine autostart operation;
forgoing via the controller the execution of the engine autostart operation when the driveline torque sag will occur during execution of the engine autostart operation unless a superseding condition compels the execution of the engine autostart operation; and
executing via the controller the engine autostart operation upon occurrence of the superseding condition;
wherein the superseding condition is associated with a state of charge (SOC) of the energy storage device; and
wherein the driveline torque sag comprises a decrease in the propulsion torque without a corresponding decrease in the driver torque request.