Patent ID: 8121768
Filing Date: 2012-02-21
Classification: B60K,B60L,B60W,F16H,Y02T,Y10T

Abstract:
1. Method for controlling a powertrain system including an engine coupled to an electro-mechanical transmission to transfer power between the engine and a plurality of torque generating machines and an output member, the transmission operative in one of a plurality of operating range states through selective application of torque transfer clutches and the engine operatively coupled to a main hydraulic pump to supply pressurized fluid to a hydraulic circuit operative to apply the torque transfer clutches, the method comprising: determining an output torque request to the output member; determining a pressure output of the main hydraulic pump based upon an engine input speed; calculating a clutch reactive torque capacity for each applied torque transfer clutch based upon the pressure output of the main hydraulic pump; and determining a preferred engine input speed to achieve the clutch reactive torque capacity to meet the output torque request to the output member.