Patent ID: 9008925
Filing Date: 2015-04-14
Classification: F16H

Abstract:
1. A method of controlling operation of a transmission brake in an automated change-speed transmission that is couplable by a separator clutch to a drive engine of a motor vehicle, the transmission brake is controlled by a control cylinder ( 8 ) that is pressure-medium-actuated by way of associated inlet and outlet valves ( 16 , 18 ), and at least one main cut-off valve ( 4 ) is arranged upstream from the inlet and the outlet valves ( 16 , 18 ) by which a nominal pressure, of a pressure medium supplied to the control cylinder ( 8 ), is controllable, the method comprising the steps of: determining, with a control unit, a rotational speed gradient of rotating transmission components to be braked by the transmission brake, when in a shifting operation with the transmission in neutral, the separator clutch disengaged and the transmission brake engaged; determining, with the control unit, a mass of the rotating transmission components to be braked by the transmission brake during the shifting operation; calculating, with the control unit, a value of currently effective braking torque of the transmission brake from the determined speed gradient and the determined mass to be braked; associating, with the control unit, the determined value of the current braking torque with a current regulated value of a nominal pressure; storing the value of the nominal pressure and the value of the braking torque in a data memory of the control unit; and using the stored values of the nominal pressure and the braking torque, for either controlling or regulating braking action, during subsequent actuations of the transmission brake.