Patent ID: 6578442
Filing Date: 2003-06-17
Classification: F16H,Y10T

Abstract:
A gear shifting control device for a synchromesh transmission transmitting rotation from a power source to driving wheels, comprising:first and second sets of intermeshed mating gears having different respective gear ratios; a synchronizer for selecting one of the sets of mating gears, the synchronizer comprising: a shaft on which one of the gears of one the sets of mating gears is mounted for rotation relative thereto to define an idling gear; a sleeve mounted on the shaft for rotation therewith and movable relative thereto in an axial direction defined by a center axis of the sleeve; a synchronizer ring rotatable relative to the idling gear and relatively movable thereto in the axial direction; a frictional surface rotatable with the idling gear; a first clutch rotatable with the sleeve; and a second clutch rotatable with the idling gear; the sleeve being movable in the axial direction to contact the synchronizer ring; the idling gear and the sleeve being synchronized with one another in response to the synchronizer ring being pressed against the frictional surface, whereby the first clutch and the second clutch are balked; an actuator for generating a load for moving the sleeve in the axial direction and electrically controlled in accordance with an external signal; a transmitting mechanism for transmitting the generated load by the actuator to the sleeve; and a controller for controlling the actuator for varying the gear ratio of the transmission based upon at least one of: a driver's intention, vehicle condition, and a condition of the transmission; the controller arranged for supplying to the actuator a driving signal continuously varying in accordance with time when changing an actual value of the sleeve load operating the sleeve to a required value different from a current value; wherein the controller includes a pattern varying means for varying a pattern of the driving signal in accordance with time, the pattern being varied based on at least one of: an initial speed which corresponds to a speed of the sleeve or a member moved with the sleeve at a start of supplying the driving signal to the actuator, and a vibration cycle which corresponds to a vibration cycle of the sleeve load in response to a step signal when the step signal is supplied to the actuator.