Control of clutch fill command based on hydraulic state of oncoming clutch

A method of controlling a clutch fill command for an oncoming hydraulically-actuated clutch during a shift event, via a controller having a tangible, non-transitory medium for storing instructions and a processor for executing the instructions, the method comprising:

• identifying a speed profile associated with the oncoming clutch and the shift event, the speed profile defining an amount of time to synchronize the oncoming clutch during the shift event;
• determining an initial time for generating the clutch fill command such that completion of the clutch fill command is synchronized with the identified speed profile of the oncoming clutch;
• generating a clutch fill command at the initial time;
• determining a real-time hydraulic state of the oncoming clutch based on one or more monitors operatively connected to the clutch;
• generating an acceptable speed margin for the oncoming clutch based at least partially on the real-time hydraulic state of the oncoming clutch;
• detecting a real-time speed of the clutch from a speed sensor operatively connected to the clutch;
• canceling the clutch fill command if the real-time speed of the clutch is outside the acceptable speed margin for the clutch;
• and
• wherein the acceptable speed margin for the oncoming clutch is configured to be at a maximum value at the initial time for generating the clutch fill command and configured to subsequently decrease.

A method of controlling a clutch fill command for an oncoming hydraulically-actuated clutch during a shift event, via a controller having a tangible, non-transitory medium for storing instructions and a processor for executing the instructions, the method comprising:

• identifying a speed profile associated with the oncoming clutch and the shift event, the speed profile defining an amount of time to synchronize the oncoming clutch during the shift event;
• determining an initial time for generating the clutch fill command such that completion of the clutch fill command is synchronized with the identified speed profile of the oncoming clutch;
• generating a clutch fill command at the initial time;
• determining a real-time hydraulic state of the oncoming clutch based on one or more monitors operatively connected to the clutch;
• generating an acceptable speed margin for the oncoming clutch based at least partially on the real-time hydraulic state of the oncoming clutch;
• detecting a real-time speed of the clutch from a speed sensor operatively connected to the clutch;
• canceling the clutch fill command if the real-time speed of the clutch is outside the acceptable speed margin for the clutch;
• and
• wherein determining the real-time hydraulic state of the oncoming clutch includes:
• determining a real-time unfilled portion of a predefined fill volume, the oncoming clutch being configured to transmit a torque related to an applied oncoming clutch pressure when the predefined fill volume is completely filled with a fluid;
• determining a real-time flow rate of the fluid entering the predefined fill volume;
• determining a remaining fill time for the oncoming clutch based at least partially on the real-time unfilled portion of the predefined fill volume and the real-time flow rate;
• and
• generating a percentage remaining fill time for the oncoming clutch based at least partially on the remaining fill time.