Patent ID: 8433488
Filing Date: 2013-04-30
Classification: B60W,F16H,Y10T

Abstract:
1. In a torque converter having a pump that is rotatably driven by an internal combustion engine and that is fluidly coupled to a turbine, and a lockup clutch connected between the pump and the turbine, a method for controlling engagement of the lockup clutch, the method comprising: determining inertia of the engine, determining torque applied by the engine to the pump, determining rotational speed of the turbine, selecting a pump speed profile that reduces rotational speed of the pump from a first speed to the rotational speed of the turbine over time, determining a pump acceleration profile based on the pump speed profile, computing a lockup clutch command as a function of the inertia of the engine, the torque applied by the engine to the pump, the rotational speed of the turbine, the pump speed profile and the pump acceleration profile, and controlling engagement of the lockup clutch using the lockup clutch command.