Patent ID: 8702564

Claim:
A method of controlling a dual clutch and a plurality of synchronizers in a transmission, the method comprising: selecting a synchronizer from the plurality of synchronizers and a clutch from the dual clutch to be actuated in order to achieve a desired speed ratio in the transmission; selecting a commanded pressure level for a clutch pressure control solenoid in upstream fluid communication with the selected clutch only from the higher of a pressure level required to enable a required amount of flow through a flow control solenoid in downstream fluid communication with the pressure control solenoid and a pressure level required to hold a clutch torque on the selected clutch; commanding the clutch pressure control solenoid to provide a first supply of hydraulic fluid at the selected commanded pressure level; commanding the clutch flow control solenoid to provide a flow rate of the first supply of hydraulic fluid that will actuate the selected clutch; commanding a synchronizer pressure control solenoid to provide a second supply of hydraulic fluid to a synchronizer flow control solenoid and to a first input of a mode valve; commanding the synchronizer flow control solenoid to provide a third supply of hydraulic fluid to a second input of the mode valve; actuating the mode valve to one of the first and second positions to connect the first input with a first output and the second input with a second output, wherein the first output is connected to a first portion of a chamber of a actuator and the second output is connected to a second portion of the chamber of the actuator; and modulating the second supply of hydraulic fluid from the synchronizer pressure control solenoid and the third supply of hydraulic fluid from the synchronizer flow control solenoid to move the actuator to a at least one of a first and second position to engage the selected synchronizer.