Patent ID: 7890238
Filing Date: 2011-02-15
Classification: F16H

Abstract:
1. A method for detecting damage in-a shift-control actuator of an automated manual transmission, comprising at least one of the following steps: (a) determining an actual time period required for synchronizing a gear; comparing the actual time period to a nominal time period for synchronizing the gear, and determining whether damage is present in the shift-control actuator, the existence of damage being determined when the actual time period deviates from the nominal time period; (b) moving the shift-control actuator up to a limit stop following engagement of the gear or another gear; determining whether the limit stop reached is an internal limit stop of the shift-control actuator or a limit stop of a gear transmission; and establishing whether damage exists in the shift-control actuator, the existence of damage being determined when the limit stop reached is an internal limit stop of the shift-control actuator; and (c) determining an actual engine speed during an overlap phase comparing the actual engine speed to a speed range within which the engine speed is expected during the overlap phase, and determining whether damage exists in the shift-control actuator, the existence of damage being determined when the actual speed is not within the range that includes the expected speed.