Method and apparatus for controlling a line pressure of an...

Details Method and apparatus for controlling a line pressure of an... Method and apparatus for controlling a line pressure of an...

2007-12-06

2010-12-14

Le, David D (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

C477S144000

Reexamination Certificate

active

07850571

ABSTRACT:
An apparatus and method for controlling line pressure of an automatic transmission. A driving information detection unit obtains information. A shift control unit determines if a power-on downshift is requested based on the information of the driving information detection unit, and controls the line pressure based on if the power-on downshift is requested. An actuator forms the line pressure according to a control signal of the shift control unit. A pressure supply control unit controls supply of the line pressure to on-coming and off-going frictional elements of the transmission. The method outputs a first value of a line pressure control duty if the power-on downshift is requested; subsequently outputs a second, lower value of the line pressure control duty if a first shifting is started during outputting of the first value; and subsequently outputs the first value if a turbine speed is greater than or equal to a predetermined speed.

REFERENCES:
patent: 5792021 (1998-08-01), Minowa et al.
patent: 5810692 (1998-09-01), Takiguchi et al.
patent: 5842951 (1998-12-01), Yasue et al.
patent: 05-312261 (1993-11-01), None
patent: 2002-295663 (2002-10-01), None
patent: 10-1999-0053662 (1999-07-01), None
patent: 10-1999-0053664 (1999-07-01), None

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