Method of controlling a hydraulic control system for a dual clutch transmission
AssigneeGM Global Technology Operations LLC
InventorsPhilip C. Lundberg, Bret M. Olson, Brian W. Whitmarsh, Wayne B. Vogel
Life of this patent
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Abstract
A hydraulic control system for a dual clutch transmission includes a plurality of solenoids and valves in fluid communication with a plurality of clutch actuators and with a plurality of synchronizer actuators. The clutch actuators are operable to actuate a plurality of torque transmitting devices and the synchronizer actuators are operable to actuate a plurality of synchronizer assemblies. Selective activation of combinations of the solenoids allows for a pressurized fluid to activate at least one of the clutch actuators and synchronizer actuators in order to shift the transmission into a desired gear ratio.
Claims12
A method of controlling a dual clutch and a plurality of synchronizers in a transmission, the method comprising:
- selecting a first actuator and one of a first and a second clutches of the dual clutch, and wherein the first actuator actuates a first of the plurality of synchronizers;
- actuating the selected clutch of the dual clutch with a pressurized hydraulic fluid;
- commanding a first solenoid to provide a first supply of hydraulic fluid to a first input of a first logic valve assembly, wherein the first solenoid is in downstream fluid communication with the source of pressurized hydraulic fluid and the first supply of hydraulic fluid moves a valve of the first logic valve assembly to a stroked position;
- commanding a second solenoid to provide a second supply of hydraulic fluid to a first input of a second logic valve assembly and a first input of a third logic assembly, wherein the second solenoid is in downstream fluid communication with the source of pressurized hydraulic fluid, the second supply of hydraulic fluid moves a valve of the second logic valve assembly to a stroked position, and the second supply of hydraulic fluid moves a valve of the third logic valve assembly to a stroked position;
- actuating a first flow control solenoid to provide pressurize hydraulic fluid to a second input port of the first logic valve which is in communication with the second input port of the second logic valve which is in selective communication with a first output of the second logic valve which is in communication with a first input port of the selected actuator which moves the first of the plurality of synchronizers to a first engaged position, and
- actuating a second flow control solenoid to provide pressurize hydraulic fluid to a third input port of the first logic valve which is in communication with a third input port of the second logic valve which is in selective communication with a third output of the second logic valve which is in communication with a second input port of the selected actuator which moves the first of the plurality of synchronizers to a second engaged position.
Dependencies are inferred from the claim text.