Patent ID: 8099204
Filing Date: 2012-01-17
Classification: B60K,B60L,B60W,F16H,Y02T,Y10T

Abstract:
1. A method for controlling a powertrain system comprising an engine coupled to an input member of a transmission operative to transmit power between the input member, a torque machine and an output member, the torque machine connected to an energy storage device, the engine selectively operative in engine states comprising an engine-on state and an engine-off state during ongoing powertrain operation, wherein a control module performs the following steps comprising: determining long-term electric power limits for output power of the energy storage device; commanding the engine to transition from a first engine state to a second engine state during ongoing powertrain operation; and adjusting the long-term electric power limits of the energy storage device and controlling the torque machine in response to the adjusted long-term electric power limits of the energy storage device during the transition from the first engine state to the second engine state; the steps including: monitoring output power of the energy storage device; monitoring the engine for an autostart operating state; determining a long-term electric power limit comprising a maximum electric power limit for output power of the energy storage device; enabling an electric power boost when the engine is in the autostart operating engine operating state; and adjusting the maximum electric power limit greater than the long-term electric power limit when the electric power boost is enabled; and including, monitoring the engine for an autostop operating state; determining a long-term electric power limit comprising a minimum electric power limit for output power of the energy storage device; enabling an electric power boost when the engine is in the autostop operating state; and adjusting the minimum electric power limit to be less than the long-term electric power limit when the electric power boost is enabled.