Patent ID: 7222552
Filing Date: 2007-05-29
Classification: F16H,G05B,Y10S,Y10T

Abstract:
1. A controller for controlling an operation of a transmission including a plurality of gear positions having a coupling sleeve integrally rotatable on an input shaft or an output shaft with a shift fork coupled to the coupling sleeve, idle gears arranged so as to be relatively rotatable on the shaft on which the coupling sleeve is arranged and not axially movable on the shaft and coupled to one of the input shaft and the output shaft where the coupling sleeve is not arranged, and a synchronizer ring for synchronizing the number of revolutions between the coupling sleeve and the idle gear by means of a frictional force by contacting the coupling sleeve with the idle gear in a shift operation, the synchronizer ring being arranged so as to be freely rotatable on the coupling sleeve and the idle gear and arranged so as to be movable in a direction of the shaft on which the coupling sleeve is arranged; and a shift actuator for engaging the coupling sleeve with the idle gear by axially moving the coupling sleeve with operating the shift fork of each gearshift position, the controller comprising: actual position grasping means for grasping an actual position of the coupling sleeve; shift position control means for performing the shift operation of the transmission by determining a control input to the shift actuator so that an actual position of the coupling sleeve matches a predetermined target position; and gear position malfunction detecting means for detecting a malfunction in a gear position under execution of the shift operation when the actual position of the coupling sleeve has reached a malfunction judgment position set within a range from a balk point to just before a contact point between the coupling sleeve and the idle gear without causing a difference between the actual position and the target position of the coupling sleeve to be greater than or equal to a predetermined contact judgment value after starting the shift operation of the transmission.