Patent ID: 8930108
Filing Date: 2015-01-06
Classification: B60T,G05G

Abstract:
1. A method of actuating a retarder for a motor vehicle during overrun operation of the motor vehicle, the method comprising the steps of: monitoring engine torque with a control unit; when a negative engine torque is recognized, monitoring a position of an accelerator pedal via sensor signals that are delivered to the control unit; actuating a retarder to apply retarder braking torque; applying a retarder braking torque when the accelerator pedal is released to a threshold pedal position, and while the engine torque is recognized as being negative; adjusting the retarder braking torque proportionally to the accelerator pedal position when the accelerator pedal is released to pedal positions between the threshold pedal position and a second pedal position, and while the engine torque is recognized as being negative; and applying a maximum retarder braking torque when the accelerator pedal is released to pedal positions beyond the second pedal position, and while the engine torque is recognized as being negative.