Hydraulic control apparatus of automatic transmission

Details Hydraulic control apparatus of automatic transmission Hydraulic control apparatus of automatic transmission

1997-08-12

1999-09-21

Cuchlinski, Jr., William A.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

701 55, 701 64, 477 34, 477 43, 477115, 477118, G06F 1700

Patent

active

059547766

ABSTRACT:
A hydraulic control unit of an automatic transmission calculates deceleration during a coasting downshift, and calculates a piston play offsetting time, that is, the lag time that elapses between a shift decision and the start of the shift, on the basis of a correction value determined in accordance with the lag time learned from the previous shift. Based on the rate of deceleration and the piston play offsetting time, the downshift line in the speed shift map is corrected, that is, advanced in timing. Using this timing-advanced shift line, the control unit makes an earlier shift decision such that the shift starts in a proper state of operation, thus reducing shift shock during a coasting downshift and preventing excessive engine speed during a high-speed upshift.

REFERENCES:
patent: 4485695 (1984-12-01), Kawamoto
patent: 5267491 (1993-12-01), Sumimoto et al.

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