Hydraulic control system for automatic transmission

Details Hydraulic control system for automatic transmission Hydraulic control system for automatic transmission

2008-01-15

2008-01-15

Pang, Roger (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C701S058000

Reexamination Certificate

active

07318789

ABSTRACT:
An automatic transmission has an electronic control unit and a hydraulic control unit. The electronic control unit outputs an engagement command pressure to a solenoid disposed in a hydraulic control unit to generate a shelf pressure to upshift the automatic transmission. The engagement command pressure is corrected downwardly when the maximum rate of the gear ratio change is larger than the rate of change of a thrust-up determination gear ratio, and upwardly when the maximum rate of the gear ratio change is smaller than the rate change of a prolongation determination gear ratio. By correcting the engagement command pressure using the maximum rate of the gear ratio change, a proper output shaft torque wave form can be obtained so that a fluctuation of an output shaft torque during a torque phase while upshifting has no strong influence on the acceleration of a vehicle to achieve a comfortable shift feeling.

REFERENCES:
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patent: 6041275 (2000-03-01), Takiguchi
patent: 6543593 (2003-04-01), Saito
patent: 6997843 (2006-02-01), Saitou
patent: 2004/0092365 (2004-05-01), Kwon et al.
patent: 62-41460 (1987-02-01), None
patent: 409280354 (1997-10-01), None
patent: 02000088090 (2000-03-01), None

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