Patent ID: 8041488
Filing Date: 2011-10-18
Classification: B60W,F16D,Y10T

Abstract:
1. A method for determining a motion transmission value that describes security of motion transmission between two rotatable components that transmit motion through frictional engagement with a transmitting means, which motion transmission value provides information relative to security of motion transmission through the reaction of the motion that is transmitted between an input component and an output component to a change in the contact force between the components that are frictionally engaged, said method comprising the steps of: setting a contact force between two frictionally engaged components; modulating the contact force between the frictionally engaged components in a predetermined contact force change range and at a predetermined contact force excitation frequency during transmission of motion by the frictionally engaged components; detecting rotational speed changes in the motion transmission resulting from the contact force modulation between the frictionally engaged components during the modulation of the contact force; evaluating the detected rotational speed changes in the motion transmission resulting from the contact force modulation between the frictionally engaged components using a filtering process to obtain average rotational speed change values around the excitation frequency; determining from the average rotational speed change values a security of motion transmission value representative of slippage between the frictionally engaged components as a result of the evaluation of the detected rotational speed changes; and adjusting the contact force between the frictionally engaged components based upon the determined security of motion transmission value, so that the frictionally engaged components operate at a contact pressure that avoids excessive slippage therebetween and that avoids excessive contact pressure therebetween.