Method for monitoring the operability of mechanical power transmission path between an actuator of an automated transmission and a transmission shift element, especially in a bus or lorry, detects transmission path defect before shifting

摘要

In the monitoring method, the selection of the gear step to be engaged takes place via a control unit (13), and before the selection process a matching movement in the selection direction is performed with the shift element until a reference point has been detected by the control unit. Upon recognition of the reference point the gear selection step is performed. The reference point is a stop at which the shift element stops in the selection direction, the stop being detected by the control unit. The method involves monitoring in the control unit the sum of a kinetic energy of the actuator (13b) and of electrical energy that is fed to the actuator; comparing the monitored sum with a reference value of elastic energy that can be absorbed by the power transmission path; and performing the alignment movement when the reference value is exceeded.