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US 8,798,889 B2Granted
Automatic transmission and method of control for rejecting erroneous torque measurements
AssigneeFord Global Technologies, LLC
InventorsYuji Fujii, Bradley Dean Riedle, Gregory Michael Pietron, Joseph F. Kucharski, Diana Yanakiev, Richard Reynolds Hathaway
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Abstract
A method for an automatic transmission includes measuring torque of a component of the transmission using a torque sensor in communication with the component. The torque of the component is estimated from information other than the measured torque. The measured torque is rejected from being used in a control operation of the transmission if the difference between the measured torque and the estimated torque is greater than a selected threshold.
Claims13
A method comprising:
- measuring torque of a shaft of a transmission at a current time using a magneto-elastic torque sensor located within the transmission at the shaft;
- estimating the torque of the shaft at the current time from information other than the measured torque;
- and
- rejecting the measured torque from being used in a control operation of the transmission if the difference between the measured torque and the estimated torque exceeds a selected threshold.
1 more element
An automatic transmission comprising:
- an input shaft connectable to an engine via a torque converter;
- an output shaft;
- gearing defining multiple torque flow paths from the input shaft to the output shaft;
- at least one clutch for shifting between gear configurations during a shift event;
- a magneto-elastic torque sensor located downstream of the torque converter at the input shaft and configured to measure torque of the input shaft at a current time;
- and
- a controller in communication with the torque sensor and configured to:
- estimate the torque of the input shaft at the current time from information other than the measured torque;
- and
- reject the measured torque from being used in a control operation of the transmission if the difference between the measured torque and the estimated torque is greater than a selected threshold.
7 more elements
Dependencies are inferred from the claim text.