Patent ID: 8355833

Claim:
A vehicular system comprising: an electrical subsystem including a high-voltage battery, a low-voltage battery, a direct-current/direct-current converter, and electrical accessories; a crankshaft; an internal combustion engine connected to the crankshaft, and generating a first, engine torque T 1 to drive the crankshaft; an electric machine coupled to the crankshaft, and applying a second torque T 2 to the crankshaft; a mechanical accessory sub-system, including at least one mechanical accessory, coupled to the crankshaft, and applying a third, accessory torque T 3 to the crankshaft; a control sub-system including: a processor; and a tangible, non-transitory computer-readable medium, storing instructions that, when executed by the processor, cause the processor to: during idle operation of the vehicle, select a mode of operation, of a plurality of system modes including a charge mode and a discharge mode, to stabilize a net torque T 4 being a sum of the first, second, and third torques (T 4 =T 1 +T 2 +T 3 ); and control operation of at least one of the electric machine and the engine according to the selected mode.