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US 6,604,412 B2Granted
Sensor diagnostics
AssigneeFord Global Technologies, LLC
InventorsMrdjan J. Jankovic, Julia Voutyras
Life of this patent
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Abstract
A method for obtaining an accurate cylinder air-charge estimate is presented. First, a sensor-based powertrain torque estimate is obtained. Next, a torque converter-based powertrain torque estimate is obtained when the torque converter clutch is unlocked. The two estimates are compared, and if they differ by more than a predetermined amount, sensor drift is diagnosed, and corrected.
Claims13
A method for diagnosing a sensor in a vehicle having an engine coupled to a transmission, the vehicle further having a torque converter coupled between the engine and the transmission, the method comprising:
- determining a first estimate of a transmission input torque based on a torque converter characteristic;
- determining a second estimate of said input torque based on a sensor signal;
- and
- providing an indication of sensor degradation based on a comparison of said first estimate and said second estimate.
1 more element
Dependencies are inferred from the claim text.