Adjustment method for vehicle automatic transmission

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control

Reexamination Certificate

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Details

C701S052000, C701S053000, C701S067000, C701S068000, C477S034000, C477S143000, C477S156000, C477S159000, C477S154000, C475S123000, C475S125000, C475S127000, C475S129000, C475S120000

Reexamination Certificate

active

07925407

ABSTRACT:
The adjustment method includes an estimation step in which valve characteristics of the linear solenoid valves fitted to the hydraulic control circuit are measured, and estimated linear valve characteristics of the linear solenoid valves in isolation state are estimated based on the measured valve characteristics using predetermined correlations; and a correction value output step in which estimated linear piston-end pressures of the hydraulically-driven friction engagement elements immediately before the hydraulically-driven friction engagement elements are engaged are calculated based on the estimated linear valve characteristics, and the correction values that are applied to the control command values to adjust the drive currents supplied from the valve control unit to the linear solenoid valves are calculated based on differences between the estimated linear piston-end pressures and nominal piston-end pressures, and then output.

REFERENCES:
patent: 5931885 (1999-08-01), Kubo et al.
patent: 6616561 (2003-09-01), Futamura
patent: 7090614 (2006-08-01), Takagi
patent: 7373234 (2008-05-01), Hwang et al.
patent: 11-125329 (1999-05-01), None
patent: 11-201314 (1999-07-01), None
patent: 2001-502405 (2001-02-01), None
patent: 2003-14119 (2003-01-01), None
patent: (A) 2004-212182 (2004-07-01), None
patent: (A) 2004-286062 (2004-10-01), None
patent: 2004-325404 (2004-11-01), None
patent: 2005-106131 (2005-04-01), None
patent: 2005-155920 (2005-06-01), None
patent: 2006-114525 (2006-04-01), None
Japanese Office Action dated Aug. 11, 2008.

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