Control method for prediction, detection, and compensation of torque reversal during synchronous shifting of a ball-type continuously variable planetary
OwnerJeffrey M. David, T. Neil McLemoreinventors
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Abstract
A control system for a multiple-mode continuously variable transmission is described as having a ball planetary variator operably coupled to multiple-mode gearing. The control system has a transmission control module configured to receive a plurality of electronic input signals, and to determine a mode of operation from a plurality of control ranges based at least in part on the plurality of electronic input signals. In some embodiments, the system is configured to predict, detect, and compensate for a torque reversal module through the ball planetary variator.
Claims9
A method for controlling ratio in a ball planetary variator (CVP) in a multiple mode transmission, said CVP operably coupled to an engine of a vehicle, the method comprising:
- sensing a commanded transmission mode;
- commanding a release of an off-going clutch based on the commanded transmission mode;
- commanding an engagement of an on-coming clutch based on the commanded transmission mode;
- calculating a torque capacity of the on-coming clutch;
- calculating a torque capacity of the off-going clutch;
- comparing the torque capacity of the on-coming clutch and the torque capacity of the off-going clutch;
- and
- commanding a CVP position correction when the torque capacity of the on-coming clutch is greater than the torque capacity of the off-going clutch.
A method for controlling ratio in a ball planetary variator (CVP) in a multiple mode transmission, said CVP operably coupled to an engine of a vehicle, the method comprising:
- sensing a commanded transmission mode;
- commanding a release of an off-going clutch based on the commanded transmission mode;
- commanding an engagement of an on-coming clutch based on the commanded transmission mode;
- determining an anticipated time to engagement of the on-coming clutch;
- and
- commanding a CVP position correction at a predetermined time based on the anticipated time to engagement of the off-coming clutch.
A method for controlling ratio in a ball planetary variator (CVP) in a multiple mode transmission, said CVP operably coupled to an engine of a vehicle, the method comprising:
- sensing an early commanded transmission mode, an on-going clutch speed, and an off-going clutch speed;
- commanding a release of an off-going clutch based on the early commanded transmission mode;
- commanding an engagement of an on-coming clutch based on the early commanded transmission mode;
- detecting a slip speed of the on-coming clutch;
- and
- commanding a CVP position correction based on the detection of a speed change in the on-coming clutch and the off-going clutch.
Dependencies are inferred from the claim text.