Patent ID: 8850916

Claim:
A method of controlling a transmission, the method comprising: moving a synchronizer actuator fork from a disengaged start position into an engaged target position by applying fluid pressure at an initial fluid pressure value to a first side of an actuator piston, wherein movement of the synchronizer actuator fork is controlled by a pressure solenoid applying fluid pressure to the first side of the actuator piston, and a flow solenoid disposed in series with the pressure solenoid and controlling fluid flow from a second side of the actuator piston; measuring a period of time required to move the synchronizer actuator fork from the disengaged start position into the engaged target position to define a measured actuation time; comparing the measured actuation time to a target actuation time to determine if the measured actuation time is within a pre-defined time range of the target actuation time, less than the pre-defined time range of the target actuation time, or greater than the pre-defined time range of the target actuation time; adjusting the initial fluid pressure value to define a revised fluid pressure value when the measured actuation time is not within the pre-defined time range of the target actuation time, wherein the initial fluid pressure value is increased to define the revised fluid pressure value when the measured actuation time is greater than the pre-defined time range of the target actuation time, and wherein the initial fluid pressure value is decreased to define the revised fluid pressure value when the measured actuation time is less than the pre-defined time range of the target actuation time; and applying fluid pressure at the revised fluid pressure value to the first side of the actuator piston to move the synchronizer actuator fork from the disengaged start position into the engaged target position during future synchronizer actuator fork control events.