Clutch control for vehicle transmission

A method, comprising:

• determining, via a processor, a speed ratio of a transmission system comprising a transmission based at least in part on an output speed of the transmission system and an input speed of the transmission system;
• determining, via the processor, a first torque percentage for a first clutch coupled to the transmission based at least in part on the speed ratio;
• determining, via the processor, a second torque percentage for a second clutch coupled to the transmission based at least in part on the speed ratio;
• outputting, via the processor, a signal indicative of a first torque command to a clutch assembly based at least in part on the first torque percentage;
• outputting, via the processor, a signal indicative of a second torque command to the clutch assembly based at least in part on the second torque percentage;
• and
• determining, via the processor, a total torque command for the first clutch and the second clutch, wherein outputting, via the processor, the signal indicative of the first torque command to the clutch assembly is based at least in part on the total torque command, and wherein outputting, via the processor, the signal indicative of the second torque command to the clutch assembly is based at least in part on the total torque command,
• wherein the first torque command comprises multiplying the total torque command by the first torque percentage;
• and wherein the second torque command comprises multiplying the total torque command by the second torque percentage.

A system for controlling a transmission system, comprising:

• a controller configured to control a first torque through a first clutch coupled to a transmission and a second torque through a second clutch coupled to the transmission, wherein:
• the controller is configured to control the first torque and the second torque such that a first power dissipation of the first clutch is approximately equal to a second power dissipation of the second clutch when a speed ratio is zero, wherein the speed ratio comprises a ratio of a measured ratio of a speed of an output shaft of the transmission to a speed of an input shaft of the transmission to a determined ratio of the speed of the output shaft of the transmission to the speed of the input shaft of the transmission when the first clutch is fully engaged;
• and
• the controller is configured to adjust the first torque and the second torque based at least in part on the speed ratio as the first slippage of the first clutch and the second slippage of the second clutch changes.

A transmission system, comprising

• a transmission;
• a clutch assembly coupled to the transmission, wherein the clutch assembly comprises a main clutch and a helper clutch;
• and
• a controller communicatively coupled to the main clutch and to the helper clutch, wherein the controller is configured to:
• determine a speed ratio comprising a ratio of a measured ratio of a speed of an output shaft of the transmission to a speed of an input shaft of the transmission to a determined ratio of the speed of the output shaft of the transmission to the speed of the input shaft of the transmission when the main clutch is fully engaged;
• determine a first torque percentage for the main clutch based at least in part on the speed ratio;
• determine a second torque percentage for the helper clutch based at least in part on the speed ratio;
• determine a first torque command based at least in part on the first torque percentage;
• determine a second torque command based at least in part on the second torque percentage;
• control a first torque through the main clutch of the clutch assembly based at least in part on the first torque command;
• and
• control a second torque through the helper clutch of the clutch assembly based at least in part on the second torque command,
• wherein the first torque percentage increases or remains constant and the second torque percentage decreases or remains constant as the speed ratio increases.