Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Patent
1997-12-15
2000-03-21
Zanelli, Michael J.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
701 64, 475120, 477109, B60K 2816, F16H 6108
Patent
active
060412755
ABSTRACT:
An upshift control apparatus for use in an automatic transmission having first and second torque transmitting elements operable on fluid pressure between engaged and released conditions for controlling at least the fluid pressure to the second element to an initial value to engage the second element to effect an upshift from a current gear ratio to a higher traget gear ratio while releasing the first element without the use of a one-way clutch to release the first element while synchronizing rotation. Engine racing is detected after an upshift is detected when the detected gear ratio is equal to or greater than a threshold value greater than a gear ratio existing before the upshift. The fluid pressure supplied to the second element is increased to prevent the engine racing when the engine racing is detected at the early stage of the upshift before the inertia phase of the upshift starts.
REFERENCES:
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patent: 5207122 (1993-05-01), Minagawa
patent: 5489248 (1996-02-01), Tazawa
patent: 5583768 (1996-12-01), Hamajima et al.
Jatco Corporation
Zanelli Michael J.
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