METHOD AND EQUIPMENT FOR CONTROLLING SHIFT OPERATION OF TRANSMISSION

摘要

PURPOSE: To control a shift operation in a transmission by detecting tooth butt or torque lock condition in the transmission. CONSTITUTION: A control method is provided for controlling a shift operation in a transmission wherein shift actuators 30, 48 develop a force to effect the engagement of a clutch collar and a gear. The method includes detection of a non-fully engaged condition of the clutch collar and the gear. It also includes pulsing the shift actuators 30, 48 between a relatively low force and a relatively high force to disturb the clutch collar and the gear out of the non-fully engaged condition. The detecting step comprises examining either the axial position of the clutch collar or the axial position of a shift rail operatively connected to the clutch collar with a rail position sensor 43. Preferably, a signal having a modulated pulse width and a frequency between about 5 and 20 Hertz is sent to the shift actuators.