Method for controlling the positioning of the synchronizers of a dual clutch transmission

A method of controlling the positioning of a plurality of synchronizers of a dual clutch transmission to selectively engage and disengage various gears sets, and a plurality of shift actuators adapted to move the synchronizers, said method includes the steps of:

• initiating a control routine to move at least one synchronizer to a pre-determined neutral and disengaged position;
• monitoring the position of all disengaged synchronizers to sense when a disengaged synchronizer has drifted away from the pre-determined neutral position;
• reinitiating the control routine to move the disengaged synchronizer back to the pre-determined neutral position when the synchronizer drifts beyond a pre-determined neutral hysteresis position;
• and
• monitoring the position of the synchronizer to ensure that the disengaged synchronizer is returned to the pre-determined neutral position.

A method of controlling the positioning of a plurality of synchronizers of a dual clutch transmission to selectively engage and disengage various gears sets, and a plurality of shift actuators adapted to move the synchronizers, said method includes the steps of:

• initiating a control routine within an electronic control unit;
• determining whether the existing state of each shift actuator is the desired state for each shift actuator;
• determining if a jumpout flag from a monitoring routine is set;
• determining if a drift flag from the monitoring routine is set;
• determining if a shift actuator must be disengaged or neutralized when an existing state of the shift actuator is different than the desired state for the shift actuator;
• initializing a release routine when the shift actuator must be disengaged or neutralized;
• determining if the shift actuator must be engaged when the existing state of the shift actuator is different than the desired state for the shift actuator;
• and
• initializing an apply routine when the shift actuator must be engaged.

A method of controlling the positioning of a plurality of synchronizers of a dual clutch transmission to selectively engage and disengage various gears sets, and a plurality of shift actuators adapted to move the synchronizers, said method includes the steps of:

• initiating a control routine to move at least one synchronizer to a pre-determined full engagement position;
• monitoring the positions of all engaged synchronizers to sense when a synchronizer has slipped out of the pre-determined full engagement position;
• reinitiating the control routine to move an engaged synchronizer back to the pre-determined full engagement position when the engaged synchronizer slips out to a pre-determined minimum engagement position;
• monitoring the position of the engaged synchronizer to ensure that it returns to the pre-determined full engagement position;
• initiating a control routine within an electronic control unit to move at least one synchronizer to a pre-determined neutral and disengaged position;
• monitoring the position of all disengaged synchronizers to sense when a disengaged synchronizer has drifted away from the pre-determined neutral position;
• reinitiating the control routine to move the synchronizer back to the pre-determined neutral position when the disengaged synchronizer drifts beyond a pre-determined neutral hysteresis position;
• and
• monitoring the position of the disengaged synchronizer to ensure that it returns to the pre-determined neutral position.