Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Clutch control
Patent
1997-11-14
2000-04-18
Nguyen, Tan
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Clutch control
701 87, 701 90, B60K 4118
Patent
active
060526408
ABSTRACT:
Slip across a torque converter of an automotive powertrain is estimated using powertrain operating parameters throughout a powertrain operating cycle for use in powertrain control and diagnostic operations. Slip across the torque converter is estimated and is periodically updated in accordance with an adaptive control procedure to maintain model accuracy over time. The slip is estimated for both torque converter coupling and torque multiplication scenarios, with the greater of the estimates identified as indicating current slip. Current slip is applied to generate actual transmission gear ratio which is compared to commanded gear ratio when a transmission shift maneuver is not in process to identify transmission solenoid fault conditions, and which is applied for precise transmission shift enhancement control during a transmission shift maneuver.
REFERENCES:
patent: 4180978 (1980-01-01), Maddock
patent: 4535412 (1985-08-01), Cederquist
patent: 4843918 (1989-07-01), Morimoto
patent: 5417621 (1995-05-01), Tibbles
Bridges Michael J.
General Motors Corporation
Nguyen Tan
LandOfFree
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