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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
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
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.
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