System and method for controlling vehicle components during a power downshift
AssigneeGM Global Technology Operations LLC
InventorsDara Monajemi, Brian M Porto
Life of this patent
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Abstract
A transmission for a vehicle having a prime mover with an output shaft. The transmission includes an offgoing clutch that is selectively connected to the output shaft, and a controller in communication with the prime mover. The controller includes an offgoing clutch control module that determines an offgoing clutch torque profile at the start of a torque phase in a power downshift that does not exceed a predetermined offgoing clutch energy threshold and a torque request module that limits a rate of input torque into the transmission from the prime mover based upon the determined offgoing clutch torque profile.
Claims20
A vehicle comprising:
- a prime mover having an output shaft;
- an offgoing clutch that is selectively connected to the output shaft;
- a controller in communication with the prime mover, the controller including:
- an offgoing clutch control module programmed to determine an offgoing clutch torque profile at the start of a torque phase in a power downshift that does not exceed a predetermined offgoing clutch energy threshold;
- and
- a torque request module programmed to limit a rate of input torque into the transmission from the prime mover.
A transmission for a vehicle having a prime mover with an output shaft, the transmission comprising:
- an offgoing clutch that is selectively connected to the output shaft;
- a controller in communication with the prime mover, the controller including:
- an offgoing clutch control module programmed to determine an offgoing clutch torque profile at the start of a torque phase in a power downshift that does not exceed a predetermined offgoing clutch energy threshold;
- and
- a torque request module programmed to limit a rate of input torque into the transmission from the prime mover based upon the determined offgoing clutch torque profile.
A method for controlling a power downshift in a vehicle having a prime mover with an output shaft, a transmission having a clutch that acts as an offgoing clutch during the power downshift, and a controller, the method comprising:
- determining an offgoing clutch torque profile at the start of a torque phase in the power downshift that does not exceed a predetermined offgoing clutch energy threshold;
- and
- limiting a rate of input torque into the transmission from the prime mover based upon the determined offgoing clutch torque profile.
Dependencies are inferred from the claim text.