Patent ID: 7100370
Filing Date: 2006-09-05
Classification: B60W,F16D,F16H

Abstract:
1. A method for controlling the speed of a drive motor during a start up period in a drive train including a hydrodynamic coupling comprising a primary blade wheel rotatably fixed to the drive motor and a secondary blade wheel forming with the primary wheel a toroidal working space having operating medium therein, said method comprising: upon the occurrence of a regulation deviation between a target speed value that at least indirectly characterizes the desired rotational speed of the drive motor and an actual speed value that at least indirectly characterizes the actual rotational speed of the drive motor, a correcting variable is produced that changes the power transmission of the hydrodynamic coupling by changing the filling ratio of the hydrodynamic coupling which changes the rotational speed of the drive motor; said method being used in a control system for holding torque constant during a portion of the start up period.